Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
8c6e7f13 | 27 | #include <linux/uaccess.h> |
a606b6e8 | 28 | #include <linux/vmalloc.h> |
c88f762e | 29 | #include <linux/dmi.h> |
3c997079 | 30 | |
a7008254 | 31 | #include <wrapper/uuid.h> |
263b6c88 | 32 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
33 | #include <wrapper/random.h> |
34 | #include <wrapper/tracepoint.h> | |
35 | #include <wrapper/list.h> | |
cbc19040 | 36 | #include <wrapper/types.h> |
2df37e95 MD |
37 | #include <lttng/kernel-version.h> |
38 | #include <lttng/events.h> | |
39 | #include <lttng/tracer.h> | |
21f58fb7 | 40 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
41 | #include <lttng/abi-old.h> |
42 | #include <lttng/endian.h> | |
43 | #include <lttng/string-utils.h> | |
4a11ef1c | 44 | #include <lttng/utils.h> |
24591303 MD |
45 | #include <ringbuffer/backend.h> |
46 | #include <ringbuffer/frontend.h> | |
3636085f | 47 | #include <wrapper/time.h> |
4e3c1b9b | 48 | |
d83004aa JD |
49 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
50 | ||
4e3c1b9b | 51 | static LIST_HEAD(sessions); |
750b05f2 | 52 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 53 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
54 | /* |
55 | * Protect the sessions and metadata caches. | |
56 | */ | |
4e3c1b9b MD |
57 | static DEFINE_MUTEX(sessions_mutex); |
58 | static struct kmem_cache *event_cache; | |
dffef45d | 59 | static struct kmem_cache *event_notifier_cache; |
4e3c1b9b | 60 | |
b2bc0bc8 FD |
61 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
62 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
63 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
dffef45d | 64 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
3c997079 | 65 | |
a90917c3 | 66 | static void _lttng_event_destroy(struct lttng_event *event); |
dffef45d | 67 | static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier); |
a90917c3 MD |
68 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
69 | static int _lttng_event_unregister(struct lttng_event *event); | |
dffef45d | 70 | static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier); |
c099397a | 71 | static |
a90917c3 MD |
72 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
73 | struct lttng_channel *chan, | |
74 | struct lttng_event *event); | |
c099397a | 75 | static |
a90917c3 | 76 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
77 | static |
78 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 79 | static |
ceabb767 MD |
80 | int _lttng_type_statedump(struct lttng_session *session, |
81 | const struct lttng_type *type, | |
82 | size_t nesting); | |
83 | static | |
f513b2bf MD |
84 | int _lttng_field_statedump(struct lttng_session *session, |
85 | const struct lttng_event_field *field, | |
86 | size_t nesting); | |
c099397a | 87 | |
c099397a | 88 | void synchronize_trace(void) |
abcca994 | 89 | { |
92da05ce MJ |
90 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
91 | synchronize_rcu(); | |
92 | #else | |
abcca994 | 93 | synchronize_sched(); |
92da05ce MJ |
94 | #endif |
95 | ||
b8590f40 MD |
96 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
97 | #ifdef CONFIG_PREEMPT_RT_FULL | |
98 | synchronize_rcu(); | |
99 | #endif | |
100 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
101 | #ifdef CONFIG_PREEMPT_RT |
102 | synchronize_rcu(); | |
103 | #endif | |
b8590f40 | 104 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
105 | } |
106 | ||
3c997079 MD |
107 | void lttng_lock_sessions(void) |
108 | { | |
109 | mutex_lock(&sessions_mutex); | |
110 | } | |
111 | ||
112 | void lttng_unlock_sessions(void) | |
113 | { | |
114 | mutex_unlock(&sessions_mutex); | |
115 | } | |
116 | ||
9fe593d2 FD |
117 | static struct lttng_transport *lttng_transport_find(const char *name) |
118 | { | |
119 | struct lttng_transport *transport; | |
120 | ||
121 | list_for_each_entry(transport, <tng_transport_list, node) { | |
122 | if (!strcmp(transport->name, name)) | |
123 | return transport; | |
124 | } | |
125 | return NULL; | |
126 | } | |
127 | ||
3c997079 MD |
128 | /* |
129 | * Called with sessions lock held. | |
130 | */ | |
131 | int lttng_session_active(void) | |
132 | { | |
133 | struct lttng_session *iter; | |
134 | ||
135 | list_for_each_entry(iter, &sessions, list) { | |
136 | if (iter->active) | |
137 | return 1; | |
138 | } | |
139 | return 0; | |
140 | } | |
141 | ||
a90917c3 | 142 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 143 | { |
a90917c3 | 144 | struct lttng_session *session; |
d83004aa | 145 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 146 | int i; |
4e3c1b9b MD |
147 | |
148 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 149 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 150 | if (!session) |
d83004aa | 151 | goto err; |
4e3c1b9b | 152 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 153 | INIT_LIST_HEAD(&session->events); |
a7008254 | 154 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
155 | |
156 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
157 | GFP_KERNEL); | |
158 | if (!metadata_cache) | |
159 | goto err_free_session; | |
0ca42eb7 | 160 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
161 | if (!metadata_cache->data) |
162 | goto err_free_cache; | |
163 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
164 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 165 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
166 | session->metadata_cache = metadata_cache; |
167 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
168 | memcpy(&metadata_cache->uuid, &session->uuid, |
169 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
170 | INIT_LIST_HEAD(&session->enablers_head); |
171 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
172 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 173 | list_add(&session->list, &sessions); |
d1f652f8 MD |
174 | session->pid_tracker.session = session; |
175 | session->pid_tracker.tracker_type = TRACKER_PID; | |
176 | session->vpid_tracker.session = session; | |
177 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
178 | session->uid_tracker.session = session; | |
179 | session->uid_tracker.tracker_type = TRACKER_UID; | |
180 | session->vuid_tracker.session = session; | |
181 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
182 | session->gid_tracker.session = session; | |
183 | session->gid_tracker.tracker_type = TRACKER_GID; | |
184 | session->vgid_tracker.session = session; | |
185 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
186 | mutex_unlock(&sessions_mutex); |
187 | return session; | |
d83004aa JD |
188 | |
189 | err_free_cache: | |
190 | kfree(metadata_cache); | |
191 | err_free_session: | |
48f5e0b5 | 192 | lttng_kvfree(session); |
d83004aa JD |
193 | err: |
194 | mutex_unlock(&sessions_mutex); | |
195 | return NULL; | |
196 | } | |
197 | ||
750b05f2 FD |
198 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
199 | { | |
200 | struct lttng_transport *transport = NULL; | |
201 | struct lttng_event_notifier_group *event_notifier_group; | |
202 | const char *transport_name = "relay-event-notifier"; | |
203 | size_t subbuf_size = 4096; //TODO | |
204 | size_t num_subbuf = 16; //TODO | |
205 | unsigned int switch_timer_interval = 0; | |
206 | unsigned int read_timer_interval = 0; | |
dffef45d | 207 | int i; |
750b05f2 FD |
208 | |
209 | mutex_lock(&sessions_mutex); | |
210 | ||
211 | transport = lttng_transport_find(transport_name); | |
212 | if (!transport) { | |
213 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
214 | transport_name); | |
215 | goto notransport; | |
216 | } | |
217 | if (!try_module_get(transport->owner)) { | |
218 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
219 | transport_name); | |
220 | goto notransport; | |
221 | } | |
222 | ||
223 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
224 | GFP_KERNEL); | |
225 | if (!event_notifier_group) | |
226 | goto nomem; | |
227 | ||
228 | /* | |
229 | * Initialize the ring buffer used to store event notifier | |
230 | * notifications. | |
231 | */ | |
232 | event_notifier_group->ops = &transport->ops; | |
233 | event_notifier_group->chan = transport->ops.channel_create( | |
234 | transport_name, event_notifier_group, NULL, | |
235 | subbuf_size, num_subbuf, switch_timer_interval, | |
236 | read_timer_interval); | |
237 | if (!event_notifier_group->chan) | |
238 | goto create_error; | |
239 | ||
240 | event_notifier_group->transport = transport; | |
dffef45d FD |
241 | |
242 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
243 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
244 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
245 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
246 | ||
750b05f2 FD |
247 | list_add(&event_notifier_group->node, &event_notifier_groups); |
248 | ||
249 | mutex_unlock(&sessions_mutex); | |
250 | ||
251 | return event_notifier_group; | |
252 | ||
253 | create_error: | |
254 | lttng_kvfree(event_notifier_group); | |
255 | nomem: | |
256 | if (transport) | |
257 | module_put(transport->owner); | |
258 | notransport: | |
259 | mutex_unlock(&sessions_mutex); | |
260 | return NULL; | |
261 | } | |
262 | ||
d83004aa JD |
263 | void metadata_cache_destroy(struct kref *kref) |
264 | { | |
265 | struct lttng_metadata_cache *cache = | |
266 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 267 | vfree(cache->data); |
d83004aa | 268 | kfree(cache); |
4e3c1b9b MD |
269 | } |
270 | ||
a90917c3 | 271 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 272 | { |
a90917c3 MD |
273 | struct lttng_channel *chan, *tmpchan; |
274 | struct lttng_event *event, *tmpevent; | |
d83004aa | 275 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 276 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 277 | int ret; |
4e3c1b9b MD |
278 | |
279 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 280 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
281 | list_for_each_entry(chan, &session->chan, list) { |
282 | ret = lttng_syscalls_unregister(chan); | |
283 | WARN_ON(ret); | |
284 | } | |
dda6a249 | 285 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 286 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
287 | WARN_ON(ret); |
288 | } | |
abcca994 | 289 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 MD |
290 | list_for_each_entry(chan, &session->chan, list) { |
291 | ret = lttng_syscalls_destroy(chan); | |
292 | WARN_ON(ret); | |
293 | } | |
b2bc0bc8 | 294 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 295 | &session->enablers_head, node) |
b2bc0bc8 | 296 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 297 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 298 | _lttng_event_destroy(event); |
d83004aa JD |
299 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
300 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 301 | _lttng_channel_destroy(chan); |
d83004aa | 302 | } |
ab036a63 | 303 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
304 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
305 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 306 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
307 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
308 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
309 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
310 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
311 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
312 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 313 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
314 | list_del(&session->list); |
315 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 316 | lttng_kvfree(session); |
4e3c1b9b MD |
317 | } |
318 | ||
dffef45d FD |
319 | void lttng_event_notifier_group_destroy( |
320 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 321 | { |
dffef45d FD |
322 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
323 | struct lttng_event_notifier *event_notifier, *tmpevent_notifier; | |
324 | int ret; | |
325 | ||
750b05f2 FD |
326 | if (!event_notifier_group) |
327 | return; | |
328 | ||
329 | mutex_lock(&sessions_mutex); | |
dffef45d FD |
330 | |
331 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
332 | &event_notifier_group->event_notifiers_head, list) { | |
333 | ret = _lttng_event_notifier_unregister(event_notifier); | |
334 | WARN_ON(ret); | |
335 | } | |
336 | ||
21f58fb7 FD |
337 | irq_work_sync(&event_notifier_group->wakeup_pending); |
338 | ||
dffef45d FD |
339 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
340 | &event_notifier_group->enablers_head, node) | |
341 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
342 | ||
343 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
344 | &event_notifier_group->event_notifiers_head, list) | |
345 | _lttng_event_notifier_destroy(event_notifier); | |
346 | ||
750b05f2 FD |
347 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
348 | module_put(event_notifier_group->transport->owner); | |
349 | list_del(&event_notifier_group->node); | |
dffef45d | 350 | |
750b05f2 FD |
351 | mutex_unlock(&sessions_mutex); |
352 | lttng_kvfree(event_notifier_group); | |
353 | } | |
354 | ||
601252cf MD |
355 | int lttng_session_statedump(struct lttng_session *session) |
356 | { | |
357 | int ret; | |
358 | ||
359 | mutex_lock(&sessions_mutex); | |
360 | ret = lttng_statedump_start(session); | |
361 | mutex_unlock(&sessions_mutex); | |
362 | return ret; | |
363 | } | |
364 | ||
a90917c3 | 365 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
366 | { |
367 | int ret = 0; | |
a90917c3 | 368 | struct lttng_channel *chan; |
c0e31d2e MD |
369 | |
370 | mutex_lock(&sessions_mutex); | |
371 | if (session->active) { | |
372 | ret = -EBUSY; | |
373 | goto end; | |
374 | } | |
c099397a | 375 | |
3c997079 MD |
376 | /* Set transient enabler state to "enabled" */ |
377 | session->tstate = 1; | |
378 | ||
4ef81e4a | 379 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 380 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 381 | |
c099397a MD |
382 | /* |
383 | * Snapshot the number of events per channel to know the type of header | |
384 | * we need to use. | |
385 | */ | |
386 | list_for_each_entry(chan, &session->chan, list) { | |
387 | if (chan->header_type) | |
388 | continue; /* don't change it if session stop/restart */ | |
389 | if (chan->free_event_id < 31) | |
390 | chan->header_type = 1; /* compact */ | |
391 | else | |
392 | chan->header_type = 2; /* large */ | |
393 | } | |
394 | ||
64af2437 | 395 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
396 | list_for_each_entry(chan, &session->chan, list) { |
397 | if (chan->channel_type != METADATA_CHANNEL) | |
398 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
399 | } | |
64af2437 | 400 | |
a8f2d0c7 MJ |
401 | WRITE_ONCE(session->active, 1); |
402 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 403 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 404 | if (ret) { |
a8f2d0c7 | 405 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
406 | goto end; |
407 | } | |
408 | ret = lttng_statedump_start(session); | |
360f38ea | 409 | if (ret) |
a8f2d0c7 | 410 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
411 | end: |
412 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 413 | return ret; |
c0e31d2e MD |
414 | } |
415 | ||
a90917c3 | 416 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
417 | { |
418 | int ret = 0; | |
64af2437 | 419 | struct lttng_channel *chan; |
c0e31d2e MD |
420 | |
421 | mutex_lock(&sessions_mutex); | |
422 | if (!session->active) { | |
423 | ret = -EBUSY; | |
424 | goto end; | |
425 | } | |
a8f2d0c7 | 426 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
427 | |
428 | /* Set transient enabler state to "disabled" */ | |
429 | session->tstate = 0; | |
b2bc0bc8 | 430 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
431 | |
432 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
433 | list_for_each_entry(chan, &session->chan, list) { |
434 | if (chan->channel_type != METADATA_CHANNEL) | |
435 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
436 | } | |
c0e31d2e MD |
437 | end: |
438 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 439 | return ret; |
c0e31d2e MD |
440 | } |
441 | ||
9616f0bf JD |
442 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
443 | { | |
444 | int ret = 0; | |
445 | struct lttng_channel *chan; | |
446 | struct lttng_event *event; | |
447 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
448 | struct lttng_metadata_stream *stream; | |
449 | ||
450 | mutex_lock(&sessions_mutex); | |
451 | if (!session->active) { | |
452 | ret = -EBUSY; | |
453 | goto end; | |
454 | } | |
455 | ||
456 | mutex_lock(&cache->lock); | |
457 | memset(cache->data, 0, cache->cache_alloc); | |
458 | cache->metadata_written = 0; | |
459 | cache->version++; | |
460 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
461 | stream->metadata_out = 0; | |
462 | stream->metadata_in = 0; | |
463 | } | |
464 | mutex_unlock(&cache->lock); | |
465 | ||
466 | session->metadata_dumped = 0; | |
467 | list_for_each_entry(chan, &session->chan, list) { | |
468 | chan->metadata_dumped = 0; | |
469 | } | |
470 | ||
471 | list_for_each_entry(event, &session->events, list) { | |
472 | event->metadata_dumped = 0; | |
473 | } | |
474 | ||
475 | ret = _lttng_session_metadata_statedump(session); | |
476 | ||
477 | end: | |
478 | mutex_unlock(&sessions_mutex); | |
479 | return ret; | |
480 | } | |
481 | ||
a90917c3 | 482 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 483 | { |
3c997079 | 484 | int ret = 0; |
e64957da | 485 | |
3c997079 MD |
486 | mutex_lock(&sessions_mutex); |
487 | if (channel->channel_type == METADATA_CHANNEL) { | |
488 | ret = -EPERM; | |
489 | goto end; | |
490 | } | |
491 | if (channel->enabled) { | |
492 | ret = -EEXIST; | |
493 | goto end; | |
494 | } | |
495 | /* Set transient enabler state to "enabled" */ | |
496 | channel->tstate = 1; | |
b2bc0bc8 | 497 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 498 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 499 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
500 | end: |
501 | mutex_unlock(&sessions_mutex); | |
502 | return ret; | |
e64957da MD |
503 | } |
504 | ||
a90917c3 | 505 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 506 | { |
3c997079 | 507 | int ret = 0; |
e64957da | 508 | |
3c997079 MD |
509 | mutex_lock(&sessions_mutex); |
510 | if (channel->channel_type == METADATA_CHANNEL) { | |
511 | ret = -EPERM; | |
512 | goto end; | |
513 | } | |
514 | if (!channel->enabled) { | |
515 | ret = -EEXIST; | |
516 | goto end; | |
517 | } | |
518 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 519 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
520 | /* Set transient enabler state to "enabled" */ |
521 | channel->tstate = 0; | |
b2bc0bc8 | 522 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
523 | end: |
524 | mutex_unlock(&sessions_mutex); | |
525 | return ret; | |
e64957da MD |
526 | } |
527 | ||
a90917c3 | 528 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 529 | { |
3c997079 | 530 | int ret = 0; |
e64957da | 531 | |
3c997079 MD |
532 | mutex_lock(&sessions_mutex); |
533 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
534 | ret = -EPERM; | |
535 | goto end; | |
536 | } | |
537 | if (event->enabled) { | |
538 | ret = -EEXIST; | |
539 | goto end; | |
540 | } | |
a0493bef MD |
541 | switch (event->instrumentation) { |
542 | case LTTNG_KERNEL_TRACEPOINT: | |
543 | case LTTNG_KERNEL_SYSCALL: | |
544 | ret = -EINVAL; | |
545 | break; | |
546 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 547 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 548 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 549 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
550 | break; |
551 | case LTTNG_KERNEL_KRETPROBE: | |
552 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
553 | break; | |
e884017c | 554 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
555 | default: |
556 | WARN_ON_ONCE(1); | |
557 | ret = -EINVAL; | |
558 | } | |
3c997079 MD |
559 | end: |
560 | mutex_unlock(&sessions_mutex); | |
561 | return ret; | |
e64957da MD |
562 | } |
563 | ||
a90917c3 | 564 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 565 | { |
3c997079 | 566 | int ret = 0; |
e64957da | 567 | |
3c997079 MD |
568 | mutex_lock(&sessions_mutex); |
569 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
570 | ret = -EPERM; | |
571 | goto end; | |
572 | } | |
573 | if (!event->enabled) { | |
574 | ret = -EEXIST; | |
575 | goto end; | |
576 | } | |
a0493bef MD |
577 | switch (event->instrumentation) { |
578 | case LTTNG_KERNEL_TRACEPOINT: | |
579 | case LTTNG_KERNEL_SYSCALL: | |
580 | ret = -EINVAL; | |
581 | break; | |
582 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 583 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 584 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 585 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
586 | break; |
587 | case LTTNG_KERNEL_KRETPROBE: | |
588 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
589 | break; | |
e884017c | 590 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
591 | default: |
592 | WARN_ON_ONCE(1); | |
593 | ret = -EINVAL; | |
594 | } | |
3c997079 MD |
595 | end: |
596 | mutex_unlock(&sessions_mutex); | |
597 | return ret; | |
e64957da MD |
598 | } |
599 | ||
dffef45d FD |
600 | int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier) |
601 | { | |
602 | int ret = 0; | |
603 | ||
604 | mutex_lock(&sessions_mutex); | |
605 | if (event_notifier->enabled) { | |
606 | ret = -EEXIST; | |
607 | goto end; | |
608 | } | |
609 | switch (event_notifier->instrumentation) { | |
610 | case LTTNG_KERNEL_TRACEPOINT: | |
611 | case LTTNG_KERNEL_SYSCALL: | |
612 | case LTTNG_KERNEL_KPROBE: | |
613 | case LTTNG_KERNEL_FUNCTION: | |
614 | case LTTNG_KERNEL_UPROBE: | |
615 | case LTTNG_KERNEL_NOOP: | |
616 | case LTTNG_KERNEL_KRETPROBE: | |
617 | default: | |
618 | WARN_ON_ONCE(1); | |
619 | ret = -EINVAL; | |
620 | } | |
621 | end: | |
622 | mutex_unlock(&sessions_mutex); | |
623 | return ret; | |
624 | } | |
625 | ||
626 | int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier) | |
627 | { | |
628 | int ret = 0; | |
629 | ||
630 | mutex_lock(&sessions_mutex); | |
631 | if (!event_notifier->enabled) { | |
632 | ret = -EEXIST; | |
633 | goto end; | |
634 | } | |
635 | switch (event_notifier->instrumentation) { | |
636 | case LTTNG_KERNEL_TRACEPOINT: | |
637 | case LTTNG_KERNEL_SYSCALL: | |
638 | case LTTNG_KERNEL_KPROBE: | |
639 | case LTTNG_KERNEL_FUNCTION: | |
640 | case LTTNG_KERNEL_UPROBE: | |
641 | case LTTNG_KERNEL_NOOP: | |
642 | case LTTNG_KERNEL_KRETPROBE: | |
643 | default: | |
644 | WARN_ON_ONCE(1); | |
645 | ret = -EINVAL; | |
646 | } | |
647 | end: | |
648 | mutex_unlock(&sessions_mutex); | |
649 | return ret; | |
650 | } | |
651 | ||
a90917c3 | 652 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
653 | const char *transport_name, |
654 | void *buf_addr, | |
4e3c1b9b MD |
655 | size_t subbuf_size, size_t num_subbuf, |
656 | unsigned int switch_timer_interval, | |
d83004aa JD |
657 | unsigned int read_timer_interval, |
658 | enum channel_type channel_type) | |
4e3c1b9b | 659 | { |
a90917c3 MD |
660 | struct lttng_channel *chan; |
661 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
662 | |
663 | mutex_lock(&sessions_mutex); | |
d83004aa | 664 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 665 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 666 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 667 | if (!transport) { |
5a15f70c | 668 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 669 | transport_name); |
c0e31d2e | 670 | goto notransport; |
f3d01b96 | 671 | } |
a33c9927 | 672 | if (!try_module_get(transport->owner)) { |
5a15f70c | 673 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
674 | goto notransport; |
675 | } | |
a90917c3 | 676 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 677 | if (!chan) |
c0e31d2e | 678 | goto nomem; |
4e3c1b9b | 679 | chan->session = session; |
05d32c64 | 680 | chan->id = session->free_chan_id++; |
3b731ab1 | 681 | chan->ops = &transport->ops; |
125b4df4 MD |
682 | /* |
683 | * Note: the channel creation op already writes into the packet | |
684 | * headers. Therefore the "chan" information used as input | |
685 | * should be already accessible. | |
686 | */ | |
5f5ddf01 MD |
687 | chan->chan = transport->ops.channel_create(transport_name, |
688 | chan, buf_addr, subbuf_size, num_subbuf, | |
689 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
690 | if (!chan->chan) |
691 | goto create_error; | |
3c997079 | 692 | chan->tstate = 1; |
e64957da | 693 | chan->enabled = 1; |
a33c9927 | 694 | chan->transport = transport; |
d83004aa | 695 | chan->channel_type = channel_type; |
4e3c1b9b MD |
696 | list_add(&chan->list, &session->chan); |
697 | mutex_unlock(&sessions_mutex); | |
698 | return chan; | |
699 | ||
f3d01b96 MD |
700 | create_error: |
701 | kfree(chan); | |
c0e31d2e | 702 | nomem: |
a33c9927 MD |
703 | if (transport) |
704 | module_put(transport->owner); | |
c0e31d2e | 705 | notransport: |
e5382b6d | 706 | active: |
4e3c1b9b MD |
707 | mutex_unlock(&sessions_mutex); |
708 | return NULL; | |
709 | } | |
710 | ||
711 | /* | |
d83004aa JD |
712 | * Only used internally at session destruction for per-cpu channels, and |
713 | * when metadata channel is released. | |
714 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 715 | */ |
aa7c23a9 | 716 | static |
a90917c3 | 717 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 718 | { |
11b5a3c2 | 719 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 720 | module_put(chan->transport->owner); |
4e3c1b9b | 721 | list_del(&chan->list); |
8070f5c0 | 722 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
723 | kfree(chan); |
724 | } | |
725 | ||
d83004aa JD |
726 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
727 | { | |
728 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
729 | ||
730 | /* Protect the metadata cache with the sessions_mutex. */ | |
731 | mutex_lock(&sessions_mutex); | |
732 | _lttng_channel_destroy(chan); | |
733 | mutex_unlock(&sessions_mutex); | |
734 | } | |
735 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
736 | ||
737 | static | |
738 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
739 | { | |
740 | stream->finalized = 1; | |
741 | wake_up_interruptible(&stream->read_wait); | |
742 | } | |
743 | ||
e5382b6d MD |
744 | /* |
745 | * Supports event creation while tracing session is active. | |
3c997079 | 746 | * Needs to be called with sessions mutex held. |
e5382b6d | 747 | */ |
3c997079 MD |
748 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
749 | struct lttng_kernel_event *event_param, | |
750 | void *filter, | |
751 | const struct lttng_event_desc *event_desc, | |
752 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 753 | { |
3c997079 | 754 | struct lttng_session *session = chan->session; |
a90917c3 | 755 | struct lttng_event *event; |
3c997079 MD |
756 | const char *event_name; |
757 | struct hlist_head *head; | |
3d084699 | 758 | int ret; |
4e3c1b9b | 759 | |
abc0446a | 760 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 761 | ret = -EMFILE; |
e5382b6d | 762 | goto full; |
abc0446a | 763 | } |
3c997079 MD |
764 | |
765 | switch (itype) { | |
766 | case LTTNG_KERNEL_TRACEPOINT: | |
767 | event_name = event_desc->name; | |
768 | break; | |
769 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 770 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 771 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 772 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 773 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
774 | event_name = event_param->name; |
775 | break; | |
e884017c | 776 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
777 | default: |
778 | WARN_ON_ONCE(1); | |
779 | ret = -EINVAL; | |
780 | goto type_error; | |
781 | } | |
4a11ef1c FD |
782 | |
783 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
784 | LTTNG_EVENT_HT_SIZE, event_name); | |
d216ecae | 785 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
786 | WARN_ON_ONCE(!event->desc); |
787 | if (!strncmp(event->desc->name, event_name, | |
788 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
789 | && chan == event->chan) { | |
790 | ret = -EEXIST; | |
791 | goto exist; | |
abc0446a MD |
792 | } |
793 | } | |
3c997079 | 794 | |
11b5a3c2 | 795 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 796 | if (!event) { |
4cf0bf51 | 797 | ret = -ENOMEM; |
4e3c1b9b | 798 | goto cache_error; |
abc0446a | 799 | } |
4e3c1b9b MD |
800 | event->chan = chan; |
801 | event->filter = filter; | |
e5382b6d | 802 | event->id = chan->free_event_id++; |
3c997079 MD |
803 | event->instrumentation = itype; |
804 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 805 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
806 | INIT_LIST_HEAD(&event->enablers_ref_head); |
807 | ||
808 | switch (itype) { | |
ab2277d6 | 809 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
810 | /* Event will be enabled by enabler sync. */ |
811 | event->enabled = 0; | |
812 | event->registered = 0; | |
0bcedee9 | 813 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 814 | if (!event->desc) { |
4cf0bf51 | 815 | ret = -ENOENT; |
d3dbe23c | 816 | goto register_error; |
abc0446a | 817 | } |
3c997079 MD |
818 | /* Populate lttng_event structure before event registration. */ |
819 | smp_wmb(); | |
baf20995 | 820 | break; |
ab2277d6 | 821 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
822 | /* |
823 | * Needs to be explicitly enabled after creation, since | |
824 | * we may want to apply filters. | |
825 | */ | |
826 | event->enabled = 0; | |
3c997079 MD |
827 | event->registered = 1; |
828 | /* | |
829 | * Populate lttng_event structure before event | |
830 | * registration. | |
831 | */ | |
832 | smp_wmb(); | |
833 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
834 | event_param->u.kprobe.symbol_name, |
835 | event_param->u.kprobe.offset, | |
836 | event_param->u.kprobe.addr, | |
837 | event); | |
abc0446a | 838 | if (ret) { |
4cf0bf51 | 839 | ret = -EINVAL; |
d6d808f3 | 840 | goto register_error; |
abc0446a | 841 | } |
edeb3137 MD |
842 | ret = try_module_get(event->desc->owner); |
843 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 844 | break; |
7371f44c MD |
845 | case LTTNG_KERNEL_KRETPROBE: |
846 | { | |
a90917c3 | 847 | struct lttng_event *event_return; |
7371f44c MD |
848 | |
849 | /* kretprobe defines 2 events */ | |
a0493bef MD |
850 | /* |
851 | * Needs to be explicitly enabled after creation, since | |
852 | * we may want to apply filters. | |
853 | */ | |
854 | event->enabled = 0; | |
3c997079 | 855 | event->registered = 1; |
7371f44c MD |
856 | event_return = |
857 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 858 | if (!event_return) { |
4cf0bf51 | 859 | ret = -ENOMEM; |
7371f44c | 860 | goto register_error; |
abc0446a | 861 | } |
7371f44c MD |
862 | event_return->chan = chan; |
863 | event_return->filter = filter; | |
864 | event_return->id = chan->free_event_id++; | |
a0493bef | 865 | event_return->enabled = 0; |
3c997079 MD |
866 | event_return->registered = 1; |
867 | event_return->instrumentation = itype; | |
7371f44c | 868 | /* |
a90917c3 | 869 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
870 | */ |
871 | smp_wmb(); | |
3c997079 | 872 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
873 | event_param->u.kretprobe.symbol_name, |
874 | event_param->u.kretprobe.offset, | |
875 | event_param->u.kretprobe.addr, | |
876 | event, event_return); | |
877 | if (ret) { | |
878 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 879 | ret = -EINVAL; |
7371f44c MD |
880 | goto register_error; |
881 | } | |
882 | /* Take 2 refs on the module: one per event. */ | |
883 | ret = try_module_get(event->desc->owner); | |
884 | WARN_ON_ONCE(!ret); | |
885 | ret = try_module_get(event->desc->owner); | |
886 | WARN_ON_ONCE(!ret); | |
a90917c3 | 887 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 888 | event_return); |
abc0446a | 889 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
890 | if (ret) { |
891 | kmem_cache_free(event_cache, event_return); | |
892 | module_put(event->desc->owner); | |
893 | module_put(event->desc->owner); | |
894 | goto statedump_error; | |
895 | } | |
896 | list_add(&event_return->list, &chan->session->events); | |
897 | break; | |
898 | } | |
1ec65de1 | 899 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 900 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
901 | /* |
902 | * Needs to be explicitly enabled after creation, since | |
903 | * we may want to apply filters. | |
904 | */ | |
905 | event->enabled = 0; | |
3c997079 MD |
906 | event->registered = 0; |
907 | event->desc = event_desc; | |
badfe9f5 MD |
908 | switch (event_param->u.syscall.entryexit) { |
909 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
910 | ret = -EINVAL; | |
911 | goto register_error; | |
912 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
913 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
914 | break; | |
915 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
916 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
917 | break; | |
918 | } | |
919 | switch (event_param->u.syscall.abi) { | |
920 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
921 | ret = -EINVAL; | |
922 | goto register_error; | |
923 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
924 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
925 | break; | |
926 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
927 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
928 | break; | |
929 | } | |
abc0446a | 930 | if (!event->desc) { |
4cf0bf51 | 931 | ret = -EINVAL; |
259b6cb3 | 932 | goto register_error; |
abc0446a | 933 | } |
1ec65de1 | 934 | break; |
149b9a9d | 935 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
936 | /* |
937 | * Needs to be explicitly enabled after creation, since | |
938 | * we may want to apply filters. | |
939 | */ | |
940 | event->enabled = 0; | |
941 | event->registered = 1; | |
3aed4dca | 942 | |
a344f64b FD |
943 | /* |
944 | * Populate lttng_event structure before event | |
945 | * registration. | |
946 | */ | |
947 | smp_wmb(); | |
149b9a9d YB |
948 | |
949 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 950 | event_param->u.uprobe.fd, |
149b9a9d YB |
951 | event); |
952 | if (ret) | |
953 | goto register_error; | |
954 | ret = try_module_get(event->desc->owner); | |
955 | WARN_ON_ONCE(!ret); | |
956 | break; | |
e884017c | 957 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
958 | default: |
959 | WARN_ON_ONCE(1); | |
4cf0bf51 | 960 | ret = -EINVAL; |
df07930b | 961 | goto register_error; |
baf20995 | 962 | } |
a90917c3 | 963 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
964 | WARN_ON_ONCE(ret > 0); |
965 | if (ret) { | |
c099397a | 966 | goto statedump_error; |
abc0446a | 967 | } |
3c997079 | 968 | hlist_add_head(&event->hlist, head); |
dda6a249 | 969 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
970 | return event; |
971 | ||
c099397a | 972 | statedump_error: |
259b6cb3 | 973 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 974 | register_error: |
11b5a3c2 | 975 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
976 | cache_error: |
977 | exist: | |
3c997079 | 978 | type_error: |
e5382b6d | 979 | full: |
4cf0bf51 | 980 | return ERR_PTR(ret); |
4e3c1b9b MD |
981 | } |
982 | ||
dffef45d FD |
983 | struct lttng_event_notifier *_lttng_event_notifier_create( |
984 | const struct lttng_event_desc *event_desc, | |
985 | uint64_t token, struct lttng_event_notifier_group *event_notifier_group, | |
986 | struct lttng_kernel_event_notifier *event_notifier_param, | |
987 | void *filter, enum lttng_kernel_instrumentation itype) | |
988 | { | |
989 | struct lttng_event_notifier *event_notifier; | |
990 | const char *event_name; | |
991 | struct hlist_head *head; | |
992 | int ret; | |
993 | ||
994 | switch (itype) { | |
995 | case LTTNG_KERNEL_TRACEPOINT: | |
996 | case LTTNG_KERNEL_KPROBE: | |
997 | case LTTNG_KERNEL_UPROBE: | |
998 | case LTTNG_KERNEL_KRETPROBE: | |
999 | case LTTNG_KERNEL_FUNCTION: | |
1000 | case LTTNG_KERNEL_NOOP: | |
1001 | case LTTNG_KERNEL_SYSCALL: | |
1002 | default: | |
1003 | WARN_ON_ONCE(1); | |
1004 | ret = -EINVAL; | |
1005 | goto type_error; | |
1006 | } | |
1007 | ||
1008 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1009 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
1010 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1011 | WARN_ON_ONCE(!event_notifier->desc); | |
1012 | if (!strncmp(event_notifier->desc->name, event_name, | |
1013 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
1014 | && event_notifier_group == event_notifier->group | |
1015 | && token == event_notifier->user_token) { | |
1016 | ret = -EEXIST; | |
1017 | goto exist; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1022 | if (!event_notifier) { | |
1023 | ret = -ENOMEM; | |
1024 | goto cache_error; | |
1025 | } | |
21f58fb7 | 1026 | |
dffef45d FD |
1027 | event_notifier->group = event_notifier_group; |
1028 | event_notifier->user_token = token; | |
1029 | event_notifier->filter = filter; | |
1030 | event_notifier->instrumentation = itype; | |
1031 | event_notifier->evtype = LTTNG_TYPE_EVENT; | |
21f58fb7 | 1032 | event_notifier->send_notification = lttng_event_notifier_notification_send; |
dffef45d FD |
1033 | INIT_LIST_HEAD(&event_notifier->bytecode_runtime_head); |
1034 | INIT_LIST_HEAD(&event_notifier->enablers_ref_head); | |
1035 | ||
1036 | switch (itype) { | |
1037 | case LTTNG_KERNEL_TRACEPOINT: | |
1038 | /* Event will be enabled by enabler sync. */ | |
1039 | event_notifier->enabled = 0; | |
1040 | event_notifier->registered = 0; | |
1041 | event_notifier->desc = lttng_event_desc_get(event_name); | |
1042 | if (!event_notifier->desc) { | |
1043 | ret = -ENOENT; | |
1044 | goto register_error; | |
1045 | } | |
1046 | /* Populate lttng_event_notifier structure before event registration. */ | |
1047 | smp_wmb(); | |
1048 | break; | |
1049 | case LTTNG_KERNEL_KPROBE: | |
1050 | case LTTNG_KERNEL_UPROBE: | |
1051 | case LTTNG_KERNEL_KRETPROBE: | |
1052 | case LTTNG_KERNEL_FUNCTION: | |
1053 | case LTTNG_KERNEL_NOOP: | |
1054 | case LTTNG_KERNEL_SYSCALL: | |
1055 | default: | |
1056 | WARN_ON_ONCE(1); | |
1057 | ret = -EINVAL; | |
1058 | goto register_error; | |
1059 | } | |
1060 | ||
1061 | list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head); | |
1062 | hlist_add_head(&event_notifier->hlist, head); | |
1063 | return event_notifier; | |
1064 | ||
1065 | register_error: | |
1066 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1067 | cache_error: | |
1068 | exist: | |
1069 | type_error: | |
1070 | return ERR_PTR(ret); | |
1071 | } | |
1072 | ||
3c997079 MD |
1073 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
1074 | struct lttng_kernel_event *event_param, | |
1075 | void *filter, | |
1076 | const struct lttng_event_desc *event_desc, | |
1077 | enum lttng_kernel_instrumentation itype) | |
1078 | { | |
1079 | struct lttng_event *event; | |
1080 | ||
1081 | mutex_lock(&sessions_mutex); | |
1082 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
1083 | itype); | |
1084 | mutex_unlock(&sessions_mutex); | |
1085 | return event; | |
1086 | } | |
1087 | ||
dffef45d FD |
1088 | struct lttng_event_notifier *lttng_event_notifier_create( |
1089 | const struct lttng_event_desc *event_desc, | |
1090 | uint64_t id, struct lttng_event_notifier_group *event_notifier_group, | |
1091 | struct lttng_kernel_event_notifier *event_notifier_param, | |
1092 | void *filter, enum lttng_kernel_instrumentation itype) | |
1093 | { | |
1094 | struct lttng_event_notifier *event_notifier; | |
1095 | ||
1096 | mutex_lock(&sessions_mutex); | |
1097 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
1098 | event_notifier_group, event_notifier_param, filter, itype); | |
1099 | mutex_unlock(&sessions_mutex); | |
1100 | return event_notifier; | |
1101 | } | |
1102 | ||
3c997079 MD |
1103 | /* Only used for tracepoints for now. */ |
1104 | static | |
1105 | void register_event(struct lttng_event *event) | |
1106 | { | |
1107 | const struct lttng_event_desc *desc; | |
f127e61e | 1108 | int ret = -EINVAL; |
3c997079 | 1109 | |
3c997079 MD |
1110 | if (event->registered) |
1111 | return; | |
4ecb5ad5 | 1112 | |
3c997079 | 1113 | desc = event->desc; |
4ecb5ad5 MD |
1114 | switch (event->instrumentation) { |
1115 | case LTTNG_KERNEL_TRACEPOINT: | |
1116 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
1117 | desc->probe_callback, | |
1118 | event); | |
1119 | break; | |
1120 | case LTTNG_KERNEL_SYSCALL: | |
badfe9f5 | 1121 | ret = lttng_syscall_filter_enable(event->chan, event); |
4ecb5ad5 MD |
1122 | break; |
1123 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 1124 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 1125 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
1126 | case LTTNG_KERNEL_NOOP: |
1127 | ret = 0; | |
1128 | break; | |
e884017c | 1129 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
1130 | default: |
1131 | WARN_ON_ONCE(1); | |
1132 | } | |
3c997079 MD |
1133 | if (!ret) |
1134 | event->registered = 1; | |
1135 | } | |
1136 | ||
4e3c1b9b MD |
1137 | /* |
1138 | * Only used internally at session destruction. | |
1139 | */ | |
a90917c3 | 1140 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 1141 | { |
4ecb5ad5 | 1142 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
1143 | int ret = -EINVAL; |
1144 | ||
3c997079 MD |
1145 | if (!event->registered) |
1146 | return 0; | |
1147 | ||
4ecb5ad5 | 1148 | desc = event->desc; |
38d024ae | 1149 | switch (event->instrumentation) { |
ab2277d6 | 1150 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 1151 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 1152 | event->desc->probe_callback, |
11b5a3c2 | 1153 | event); |
baf20995 | 1154 | break; |
ab2277d6 | 1155 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 1156 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
1157 | ret = 0; |
1158 | break; | |
7371f44c MD |
1159 | case LTTNG_KERNEL_KRETPROBE: |
1160 | lttng_kretprobes_unregister(event); | |
1161 | ret = 0; | |
1162 | break; | |
33a39a3c | 1163 | case LTTNG_KERNEL_SYSCALL: |
badfe9f5 | 1164 | ret = lttng_syscall_filter_disable(event->chan, event); |
4ecb5ad5 MD |
1165 | break; |
1166 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
1167 | ret = 0; |
1168 | break; | |
149b9a9d YB |
1169 | case LTTNG_KERNEL_UPROBE: |
1170 | lttng_uprobes_unregister(event); | |
1171 | ret = 0; | |
1172 | break; | |
e884017c | 1173 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1174 | default: |
1175 | WARN_ON_ONCE(1); | |
1176 | } | |
3c997079 MD |
1177 | if (!ret) |
1178 | event->registered = 0; | |
dda6a249 MD |
1179 | return ret; |
1180 | } | |
1181 | ||
dffef45d FD |
1182 | /* Only used for tracepoints for now. */ |
1183 | static | |
1184 | void __always_unused register_event_notifier( | |
1185 | struct lttng_event_notifier *event_notifier) | |
1186 | { | |
1187 | const struct lttng_event_desc *desc; | |
1188 | int ret = -EINVAL; | |
1189 | ||
1190 | if (event_notifier->registered) | |
1191 | return; | |
1192 | ||
1193 | desc = event_notifier->desc; | |
1194 | switch (event_notifier->instrumentation) { | |
1195 | case LTTNG_KERNEL_TRACEPOINT: | |
1196 | case LTTNG_KERNEL_SYSCALL: | |
1197 | case LTTNG_KERNEL_KPROBE: | |
1198 | case LTTNG_KERNEL_UPROBE: | |
1199 | case LTTNG_KERNEL_KRETPROBE: | |
1200 | case LTTNG_KERNEL_FUNCTION: | |
1201 | case LTTNG_KERNEL_NOOP: | |
1202 | default: | |
1203 | WARN_ON_ONCE(1); | |
1204 | } | |
1205 | if (!ret) | |
1206 | event_notifier->registered = 1; | |
1207 | } | |
1208 | ||
1209 | static | |
1210 | int _lttng_event_notifier_unregister( | |
1211 | struct lttng_event_notifier *event_notifier) | |
1212 | { | |
1213 | const struct lttng_event_desc *desc; | |
1214 | int ret = -EINVAL; | |
1215 | ||
1216 | if (!event_notifier->registered) | |
1217 | return 0; | |
1218 | ||
1219 | desc = event_notifier->desc; | |
1220 | switch (event_notifier->instrumentation) { | |
1221 | case LTTNG_KERNEL_TRACEPOINT: | |
1222 | case LTTNG_KERNEL_KPROBE: | |
1223 | case LTTNG_KERNEL_KRETPROBE: | |
1224 | case LTTNG_KERNEL_FUNCTION: | |
1225 | case LTTNG_KERNEL_SYSCALL: | |
1226 | case LTTNG_KERNEL_NOOP: | |
1227 | case LTTNG_KERNEL_UPROBE: | |
1228 | default: | |
1229 | WARN_ON_ONCE(1); | |
1230 | } | |
1231 | if (!ret) | |
1232 | event_notifier->registered = 0; | |
1233 | return ret; | |
1234 | } | |
1235 | ||
dda6a249 MD |
1236 | /* |
1237 | * Only used internally at session destruction. | |
1238 | */ | |
be066e6c | 1239 | static |
a90917c3 | 1240 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 1241 | { |
edeb3137 MD |
1242 | switch (event->instrumentation) { |
1243 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 1244 | lttng_event_desc_put(event->desc); |
edeb3137 MD |
1245 | break; |
1246 | case LTTNG_KERNEL_KPROBE: | |
1247 | module_put(event->desc->owner); | |
1248 | lttng_kprobes_destroy_private(event); | |
1249 | break; | |
7371f44c MD |
1250 | case LTTNG_KERNEL_KRETPROBE: |
1251 | module_put(event->desc->owner); | |
1252 | lttng_kretprobes_destroy_private(event); | |
1253 | break; | |
259b6cb3 | 1254 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 1255 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1256 | break; |
149b9a9d YB |
1257 | case LTTNG_KERNEL_UPROBE: |
1258 | module_put(event->desc->owner); | |
1259 | lttng_uprobes_destroy_private(event); | |
1260 | break; | |
e884017c | 1261 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
1262 | default: |
1263 | WARN_ON_ONCE(1); | |
1264 | } | |
dda6a249 | 1265 | list_del(&event->list); |
8070f5c0 | 1266 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 1267 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1268 | } |
1269 | ||
dffef45d FD |
1270 | /* |
1271 | * Only used internally at session destruction. | |
1272 | */ | |
1273 | static | |
1274 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
1275 | { | |
1276 | switch (event_notifier->instrumentation) { | |
1277 | case LTTNG_KERNEL_TRACEPOINT: | |
1278 | case LTTNG_KERNEL_KPROBE: | |
1279 | case LTTNG_KERNEL_KRETPROBE: | |
1280 | case LTTNG_KERNEL_FUNCTION: | |
1281 | case LTTNG_KERNEL_NOOP: | |
1282 | case LTTNG_KERNEL_SYSCALL: | |
1283 | case LTTNG_KERNEL_UPROBE: | |
1284 | default: | |
1285 | WARN_ON_ONCE(1); | |
1286 | } | |
1287 | list_del(&event_notifier->list); | |
1288 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1289 | } | |
1290 | ||
d1f652f8 MD |
1291 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1292 | enum tracker_type tracker_type) | |
e0130fab | 1293 | { |
d1f652f8 MD |
1294 | switch (tracker_type) { |
1295 | case TRACKER_PID: | |
1296 | return &session->pid_tracker; | |
1297 | case TRACKER_VPID: | |
1298 | return &session->vpid_tracker; | |
1299 | case TRACKER_UID: | |
1300 | return &session->uid_tracker; | |
1301 | case TRACKER_VUID: | |
1302 | return &session->vuid_tracker; | |
1303 | case TRACKER_GID: | |
1304 | return &session->gid_tracker; | |
1305 | case TRACKER_VGID: | |
1306 | return &session->vgid_tracker; | |
1307 | default: | |
1308 | WARN_ON_ONCE(1); | |
1309 | return NULL; | |
1310 | } | |
1311 | } | |
1312 | ||
1313 | int lttng_session_track_id(struct lttng_session *session, | |
1314 | enum tracker_type tracker_type, int id) | |
1315 | { | |
1316 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1317 | int ret; |
1318 | ||
d1f652f8 MD |
1319 | tracker = get_tracker(session, tracker_type); |
1320 | if (!tracker) | |
1321 | return -EINVAL; | |
1322 | if (id < -1) | |
e0130fab MD |
1323 | return -EINVAL; |
1324 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1325 | if (id == -1) { |
1326 | /* track all ids: destroy tracker. */ | |
1327 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1328 | ret = 0; |
1329 | } else { | |
d1f652f8 | 1330 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1331 | } |
e0130fab MD |
1332 | mutex_unlock(&sessions_mutex); |
1333 | return ret; | |
1334 | } | |
1335 | ||
d1f652f8 MD |
1336 | int lttng_session_untrack_id(struct lttng_session *session, |
1337 | enum tracker_type tracker_type, int id) | |
e0130fab | 1338 | { |
d1f652f8 | 1339 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1340 | int ret; |
1341 | ||
d1f652f8 MD |
1342 | tracker = get_tracker(session, tracker_type); |
1343 | if (!tracker) | |
1344 | return -EINVAL; | |
1345 | if (id < -1) | |
e0130fab MD |
1346 | return -EINVAL; |
1347 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1348 | if (id == -1) { |
1349 | /* untrack all ids: replace by empty tracker. */ | |
1350 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1351 | } else { |
d1f652f8 | 1352 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1353 | } |
e0130fab MD |
1354 | mutex_unlock(&sessions_mutex); |
1355 | return ret; | |
1356 | } | |
1357 | ||
7e6f9ef6 | 1358 | static |
d1f652f8 | 1359 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1360 | { |
d1f652f8 MD |
1361 | struct lttng_id_tracker *id_tracker = m->private; |
1362 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1363 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1364 | int iter = 0, i; |
1365 | ||
1366 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1367 | if (id_tracker_p) { |
1368 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1369 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1370 | |
f934e302 | 1371 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1372 | if (iter++ >= *pos) |
1373 | return e; | |
1374 | } | |
1375 | } | |
1376 | } else { | |
d1f652f8 | 1377 | /* ID tracker disabled. */ |
7e6f9ef6 | 1378 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1379 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1380 | } |
1381 | iter++; | |
1382 | } | |
1383 | /* End of list */ | |
1384 | return NULL; | |
1385 | } | |
1386 | ||
1387 | /* Called with sessions_mutex held. */ | |
1388 | static | |
d1f652f8 | 1389 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1390 | { |
d1f652f8 MD |
1391 | struct lttng_id_tracker *id_tracker = m->private; |
1392 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1393 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1394 | int iter = 0, i; |
1395 | ||
1396 | (*ppos)++; | |
d1f652f8 MD |
1397 | if (id_tracker_p) { |
1398 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1399 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1400 | |
f934e302 | 1401 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1402 | if (iter++ >= *ppos) |
1403 | return e; | |
1404 | } | |
1405 | } | |
1406 | } else { | |
d1f652f8 | 1407 | /* ID tracker disabled. */ |
7e6f9ef6 | 1408 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1409 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1410 | iter++; |
1411 | } | |
1412 | ||
1413 | /* End of list */ | |
1414 | return NULL; | |
1415 | } | |
1416 | ||
1417 | static | |
d1f652f8 | 1418 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1419 | { |
1420 | mutex_unlock(&sessions_mutex); | |
1421 | } | |
1422 | ||
1423 | static | |
d1f652f8 | 1424 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1425 | { |
d1f652f8 MD |
1426 | struct lttng_id_tracker *id_tracker = m->private; |
1427 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1428 | int id; | |
7e6f9ef6 | 1429 | |
d1f652f8 | 1430 | if (p == id_tracker_p) { |
7e6f9ef6 | 1431 | /* Tracker disabled. */ |
d1f652f8 | 1432 | id = -1; |
7e6f9ef6 | 1433 | } else { |
d1f652f8 | 1434 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1435 | |
d1f652f8 MD |
1436 | id = lttng_id_tracker_get_node_id(e); |
1437 | } | |
1438 | switch (id_tracker->tracker_type) { | |
1439 | case TRACKER_PID: | |
1440 | seq_printf(m, "process { pid = %d; };\n", id); | |
1441 | break; | |
1442 | case TRACKER_VPID: | |
1443 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1444 | break; | |
1445 | case TRACKER_UID: | |
1446 | seq_printf(m, "user { uid = %d; };\n", id); | |
1447 | break; | |
1448 | case TRACKER_VUID: | |
1449 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1450 | break; | |
1451 | case TRACKER_GID: | |
1452 | seq_printf(m, "group { gid = %d; };\n", id); | |
1453 | break; | |
1454 | case TRACKER_VGID: | |
1455 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1456 | break; | |
1457 | default: | |
1458 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1459 | } |
7e6f9ef6 MD |
1460 | return 0; |
1461 | } | |
1462 | ||
1463 | static | |
d1f652f8 MD |
1464 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1465 | .start = id_list_start, | |
1466 | .next = id_list_next, | |
1467 | .stop = id_list_stop, | |
1468 | .show = id_list_show, | |
7e6f9ef6 MD |
1469 | }; |
1470 | ||
1471 | static | |
d1f652f8 | 1472 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1473 | { |
d1f652f8 | 1474 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1475 | } |
1476 | ||
1477 | static | |
d1f652f8 | 1478 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1479 | { |
1480 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1481 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1482 | int ret; |
1483 | ||
d1f652f8 | 1484 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1485 | ret = seq_release(inode, file); |
d1f652f8 MD |
1486 | if (!ret) |
1487 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1488 | return ret; |
1489 | } | |
1490 | ||
d1f652f8 | 1491 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1492 | .owner = THIS_MODULE, |
d1f652f8 | 1493 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1494 | .read = seq_read, |
1495 | .llseek = seq_lseek, | |
d1f652f8 | 1496 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1497 | }; |
1498 | ||
d1f652f8 MD |
1499 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1500 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1501 | { |
d1f652f8 | 1502 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1503 | struct seq_file *m; |
1504 | int file_fd, ret; | |
1505 | ||
1506 | file_fd = lttng_get_unused_fd(); | |
1507 | if (file_fd < 0) { | |
1508 | ret = file_fd; | |
1509 | goto fd_error; | |
1510 | } | |
1511 | ||
d1f652f8 MD |
1512 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1513 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1514 | NULL, O_RDWR); |
d1f652f8 MD |
1515 | if (IS_ERR(tracker_ids_list_file)) { |
1516 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1517 | goto file_error; |
1518 | } | |
98d7281c MJ |
1519 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1520 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1521 | goto refcount_error; |
1522 | } | |
d1f652f8 | 1523 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1524 | if (ret < 0) |
1525 | goto open_error; | |
d1f652f8 MD |
1526 | m = tracker_ids_list_file->private_data; |
1527 | ||
1528 | m->private = get_tracker(session, tracker_type); | |
1529 | BUG_ON(!m->private); | |
1530 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1531 | |
1532 | return file_fd; | |
1533 | ||
1534 | open_error: | |
9c1f4643 MD |
1535 | atomic_long_dec(&session->file->f_count); |
1536 | refcount_error: | |
d1f652f8 | 1537 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1538 | file_error: |
1539 | put_unused_fd(file_fd); | |
1540 | fd_error: | |
1541 | return ret; | |
1542 | } | |
1543 | ||
3c997079 MD |
1544 | /* |
1545 | * Enabler management. | |
1546 | */ | |
1547 | static | |
4993071a PP |
1548 | int lttng_match_enabler_star_glob(const char *desc_name, |
1549 | const char *pattern) | |
3c997079 | 1550 | { |
cbc19040 MD |
1551 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1552 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1553 | return 0; |
1554 | return 1; | |
1555 | } | |
1556 | ||
1557 | static | |
4ecb5ad5 MD |
1558 | int lttng_match_enabler_name(const char *desc_name, |
1559 | const char *name) | |
3c997079 | 1560 | { |
4ecb5ad5 | 1561 | if (strcmp(desc_name, name)) |
3c997079 MD |
1562 | return 0; |
1563 | return 1; | |
1564 | } | |
1565 | ||
1566 | static | |
1567 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1568 | struct lttng_enabler *enabler) | |
1569 | { | |
4ecb5ad5 | 1570 | const char *desc_name, *enabler_name; |
badfe9f5 | 1571 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1572 | |
1573 | enabler_name = enabler->event_param.name; | |
1574 | switch (enabler->event_param.instrumentation) { | |
1575 | case LTTNG_KERNEL_TRACEPOINT: | |
1576 | desc_name = desc->name; | |
3b861b22 FD |
1577 | switch (enabler->format_type) { |
1578 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1579 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1580 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1581 | return lttng_match_enabler_name(desc_name, enabler_name); |
1582 | default: | |
1583 | return -EINVAL; | |
1584 | } | |
4ecb5ad5 MD |
1585 | break; |
1586 | case LTTNG_KERNEL_SYSCALL: | |
1587 | desc_name = desc->name; | |
badfe9f5 | 1588 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1589 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1590 | compat = true; |
1591 | } | |
4ecb5ad5 MD |
1592 | if (!strncmp(desc_name, "syscall_exit_", |
1593 | strlen("syscall_exit_"))) { | |
1594 | desc_name += strlen("syscall_exit_"); | |
1595 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1596 | strlen("syscall_entry_"))) { | |
1597 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1598 | entry = true; |
4ecb5ad5 MD |
1599 | } else { |
1600 | WARN_ON_ONCE(1); | |
1601 | return -EINVAL; | |
1602 | } | |
badfe9f5 MD |
1603 | switch (enabler->event_param.u.syscall.entryexit) { |
1604 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1605 | break; | |
1606 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1607 | if (!entry) | |
1608 | return 0; | |
1609 | break; | |
1610 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1611 | if (entry) | |
1612 | return 0; | |
1613 | break; | |
1614 | default: | |
1615 | return -EINVAL; | |
1616 | } | |
1617 | switch (enabler->event_param.u.syscall.abi) { | |
1618 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1619 | break; | |
1620 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1621 | if (compat) | |
1622 | return 0; | |
1623 | break; | |
1624 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1625 | if (!compat) | |
1626 | return 0; | |
1627 | break; | |
1628 | default: | |
1629 | return -EINVAL; | |
1630 | } | |
1631 | switch (enabler->event_param.u.syscall.match) { | |
1632 | case LTTNG_SYSCALL_MATCH_NAME: | |
3b861b22 FD |
1633 | switch (enabler->format_type) { |
1634 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1635 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1636 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1637 | return lttng_match_enabler_name(desc_name, enabler_name); |
1638 | default: | |
1639 | return -EINVAL; | |
1640 | } | |
1641 | break; | |
1642 | case LTTNG_SYSCALL_MATCH_NR: | |
1643 | return -EINVAL; /* Not implemented. */ | |
1644 | default: | |
1645 | return -EINVAL; | |
1646 | } | |
4ecb5ad5 MD |
1647 | break; |
1648 | default: | |
1649 | WARN_ON_ONCE(1); | |
1650 | return -EINVAL; | |
1651 | } | |
3c997079 MD |
1652 | } |
1653 | ||
1654 | static | |
b2bc0bc8 FD |
1655 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1656 | struct lttng_event *event) | |
3c997079 | 1657 | { |
b2bc0bc8 FD |
1658 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1659 | event_enabler); | |
1660 | ||
1661 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1662 | return 0; |
b2bc0bc8 FD |
1663 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1664 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1665 | return 1; |
1666 | else | |
1667 | return 0; | |
1668 | } | |
1669 | ||
1670 | static | |
b2bc0bc8 FD |
1671 | struct lttng_enabler_ref *lttng_enabler_ref( |
1672 | struct list_head *enablers_ref_list, | |
3c997079 MD |
1673 | struct lttng_enabler *enabler) |
1674 | { | |
1675 | struct lttng_enabler_ref *enabler_ref; | |
1676 | ||
b2bc0bc8 | 1677 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
1678 | if (enabler_ref->ref == enabler) |
1679 | return enabler_ref; | |
1680 | } | |
1681 | return NULL; | |
1682 | } | |
1683 | ||
3c997079 | 1684 | static |
1b917d6b | 1685 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 1686 | { |
b2bc0bc8 | 1687 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
1688 | struct lttng_probe_desc *probe_desc; |
1689 | const struct lttng_event_desc *desc; | |
1690 | int i; | |
1691 | struct list_head *probe_list; | |
1692 | ||
1693 | probe_list = lttng_get_probe_list_head(); | |
1694 | /* | |
1695 | * For each probe event, if we find that a probe event matches | |
1696 | * our enabler, create an associated lttng_event if not | |
1697 | * already present. | |
1698 | */ | |
1699 | list_for_each_entry(probe_desc, probe_list, head) { | |
1700 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1701 | int found = 0; | |
1702 | struct hlist_head *head; | |
3c997079 MD |
1703 | struct lttng_event *event; |
1704 | ||
1705 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
1706 | if (!lttng_desc_match_enabler(desc, |
1707 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 1708 | continue; |
3c997079 MD |
1709 | |
1710 | /* | |
1711 | * Check if already created. | |
1712 | */ | |
4a11ef1c FD |
1713 | head = utils_borrow_hash_table_bucket( |
1714 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
1715 | desc->name); | |
d216ecae | 1716 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 1717 | if (event->desc == desc |
b2bc0bc8 | 1718 | && event->chan == event_enabler->chan) |
3c997079 MD |
1719 | found = 1; |
1720 | } | |
1721 | if (found) | |
1722 | continue; | |
1723 | ||
1724 | /* | |
1725 | * We need to create an event for this | |
1726 | * event probe. | |
1727 | */ | |
b2bc0bc8 | 1728 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
1729 | NULL, NULL, desc, |
1730 | LTTNG_KERNEL_TRACEPOINT); | |
1731 | if (!event) { | |
5a15f70c | 1732 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
1733 | probe_desc->event_desc[i]->name); |
1734 | } | |
1735 | } | |
1736 | } | |
1737 | } | |
1738 | ||
33a39a3c | 1739 | static |
1b917d6b | 1740 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
1741 | { |
1742 | int ret; | |
1743 | ||
b2bc0bc8 | 1744 | ret = lttng_syscalls_register(event_enabler->chan, NULL); |
33a39a3c MD |
1745 | WARN_ON_ONCE(ret); |
1746 | } | |
1747 | ||
1748 | /* | |
1749 | * Create struct lttng_event if it is missing and present in the list of | |
1750 | * tracepoint probes. | |
1751 | * Should be called with sessions mutex held. | |
1752 | */ | |
1753 | static | |
b2bc0bc8 | 1754 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 1755 | { |
b2bc0bc8 | 1756 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 1757 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 1758 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c MD |
1759 | break; |
1760 | case LTTNG_KERNEL_SYSCALL: | |
1b917d6b | 1761 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c MD |
1762 | break; |
1763 | default: | |
1764 | WARN_ON_ONCE(1); | |
1765 | break; | |
1766 | } | |
1767 | } | |
1768 | ||
3c997079 | 1769 | /* |
b2bc0bc8 | 1770 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
1771 | * and add backward reference from the event to the enabler. |
1772 | * Should be called with sessions mutex held. | |
1773 | */ | |
1774 | static | |
b2bc0bc8 | 1775 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 1776 | { |
b2bc0bc8 FD |
1777 | struct lttng_channel *chan = event_enabler->chan; |
1778 | struct lttng_session *session = event_enabler->chan->session; | |
1779 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
1780 | struct lttng_event *event; |
1781 | ||
b2bc0bc8 FD |
1782 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
1783 | base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && | |
1784 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
1785 | base_enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME && | |
1786 | !strcmp(base_enabler->event_param.name, "*")) { | |
1787 | if (base_enabler->enabled) | |
badfe9f5 MD |
1788 | WRITE_ONCE(chan->syscall_all, 1); |
1789 | else | |
1790 | WRITE_ONCE(chan->syscall_all, 0); | |
1791 | } | |
1792 | ||
3c997079 | 1793 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 1794 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 1795 | |
b2bc0bc8 | 1796 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
1797 | list_for_each_entry(event, &session->events, list) { |
1798 | struct lttng_enabler_ref *enabler_ref; | |
1799 | ||
b2bc0bc8 | 1800 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 1801 | continue; |
b2bc0bc8 FD |
1802 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1803 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
1804 | if (!enabler_ref) { |
1805 | /* | |
1806 | * If no backward ref, create it. | |
b2bc0bc8 | 1807 | * Add backward ref from event to event_enabler. |
3c997079 MD |
1808 | */ |
1809 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1810 | if (!enabler_ref) | |
1811 | return -ENOMEM; | |
b2bc0bc8 | 1812 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
1813 | list_add(&enabler_ref->node, |
1814 | &event->enablers_ref_head); | |
1815 | } | |
1816 | ||
f127e61e MD |
1817 | /* |
1818 | * Link filter bytecodes if not linked yet. | |
1819 | */ | |
2dfda770 FD |
1820 | lttng_enabler_link_bytecode(event->desc, |
1821 | lttng_static_ctx, | |
1822 | &event->bytecode_runtime_head, | |
1823 | lttng_event_enabler_as_enabler(event_enabler)); | |
f127e61e | 1824 | |
3c997079 MD |
1825 | /* TODO: merge event context. */ |
1826 | } | |
1827 | return 0; | |
1828 | } | |
1829 | ||
1830 | /* | |
1831 | * Called at module load: connect the probe on all enablers matching | |
1832 | * this event. | |
1833 | * Called with sessions lock held. | |
1834 | */ | |
1835 | int lttng_fix_pending_events(void) | |
1836 | { | |
1837 | struct lttng_session *session; | |
1838 | ||
1839 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 1840 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
1841 | return 0; |
1842 | } | |
1843 | ||
b2bc0bc8 FD |
1844 | struct lttng_event_enabler *lttng_event_enabler_create( |
1845 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
1846 | struct lttng_kernel_event *event_param, |
1847 | struct lttng_channel *chan) | |
1848 | { | |
b2bc0bc8 | 1849 | struct lttng_event_enabler *event_enabler; |
3c997079 | 1850 | |
b2bc0bc8 FD |
1851 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
1852 | if (!event_enabler) | |
3c997079 | 1853 | return NULL; |
b2bc0bc8 FD |
1854 | event_enabler->base.format_type = format_type; |
1855 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1856 | memcpy(&event_enabler->base.event_param, event_param, | |
1857 | sizeof(event_enabler->base.event_param)); | |
1858 | event_enabler->chan = chan; | |
3c997079 | 1859 | /* ctx left NULL */ |
b2bc0bc8 FD |
1860 | event_enabler->base.enabled = 0; |
1861 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 1862 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
1863 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
1864 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 1865 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 1866 | return event_enabler; |
3c997079 MD |
1867 | } |
1868 | ||
b2bc0bc8 | 1869 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
1870 | { |
1871 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
1872 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1873 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
1874 | mutex_unlock(&sessions_mutex); |
1875 | return 0; | |
1876 | } | |
1877 | ||
b2bc0bc8 | 1878 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
1879 | { |
1880 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
1881 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1882 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
1883 | mutex_unlock(&sessions_mutex); |
1884 | return 0; | |
1885 | } | |
1886 | ||
b2bc0bc8 | 1887 | static |
07dfc1d0 MD |
1888 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1889 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1890 | { | |
1891 | struct lttng_filter_bytecode_node *bytecode_node; | |
1892 | uint32_t bytecode_len; | |
1893 | int ret; | |
1894 | ||
1895 | ret = get_user(bytecode_len, &bytecode->len); | |
1896 | if (ret) | |
1897 | return ret; | |
1898 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1899 | GFP_KERNEL); | |
1900 | if (!bytecode_node) | |
1901 | return -ENOMEM; | |
1902 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1903 | sizeof(*bytecode) + bytecode_len); | |
1904 | if (ret) | |
1905 | goto error_free; | |
b2bc0bc8 | 1906 | |
07dfc1d0 MD |
1907 | bytecode_node->enabler = enabler; |
1908 | /* Enforce length based on allocated size */ | |
1909 | bytecode_node->bc.len = bytecode_len; | |
1910 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 1911 | |
07dfc1d0 MD |
1912 | return 0; |
1913 | ||
1914 | error_free: | |
1915 | kfree(bytecode_node); | |
1916 | return ret; | |
1917 | } | |
1918 | ||
b2bc0bc8 FD |
1919 | int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler *event_enabler, |
1920 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1921 | { | |
1922 | int ret; | |
1923 | ret = lttng_enabler_attach_bytecode( | |
1924 | lttng_event_enabler_as_enabler(event_enabler), bytecode); | |
1925 | if (ret) | |
1926 | goto error; | |
1927 | ||
1928 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1929 | return 0; | |
1930 | ||
1931 | error: | |
1932 | return ret; | |
1933 | } | |
1934 | ||
3aed4dca FD |
1935 | int lttng_event_add_callsite(struct lttng_event *event, |
1936 | struct lttng_kernel_event_callsite __user *callsite) | |
1937 | { | |
1938 | ||
1939 | switch (event->instrumentation) { | |
1940 | case LTTNG_KERNEL_UPROBE: | |
1941 | return lttng_uprobes_add_callsite(event, callsite); | |
1942 | default: | |
1943 | return -EINVAL; | |
1944 | } | |
1945 | } | |
1946 | ||
b2bc0bc8 | 1947 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
1948 | struct lttng_kernel_context *context_param) |
1949 | { | |
1950 | return -ENOSYS; | |
1951 | } | |
1952 | ||
1953 | static | |
1954 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1955 | { | |
07dfc1d0 MD |
1956 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1957 | ||
1958 | /* Destroy filter bytecode */ | |
1959 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1960 | &enabler->filter_bytecode_head, node) { | |
1961 | kfree(filter_node); | |
1962 | } | |
b2bc0bc8 FD |
1963 | } |
1964 | ||
1965 | static | |
1966 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
1967 | { | |
1968 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 1969 | |
3c997079 | 1970 | /* Destroy contexts */ |
b2bc0bc8 | 1971 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 1972 | |
b2bc0bc8 FD |
1973 | list_del(&event_enabler->node); |
1974 | kfree(event_enabler); | |
3c997079 MD |
1975 | } |
1976 | ||
dffef45d FD |
1977 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
1978 | struct lttng_event_notifier_group *event_notifier_group, | |
1979 | enum lttng_enabler_format_type format_type, | |
1980 | struct lttng_kernel_event_notifier *event_notifier_param) | |
1981 | { | |
1982 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1983 | ||
1984 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
1985 | if (!event_notifier_enabler) | |
1986 | return NULL; | |
1987 | ||
1988 | event_notifier_enabler->base.format_type = format_type; | |
1989 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
1990 | ||
1991 | memcpy(&event_notifier_enabler->base.event_param.name, event_notifier_param->event.name, | |
1992 | sizeof(event_notifier_enabler->base.event_param.name)); | |
1993 | event_notifier_enabler->base.event_param.instrumentation = event_notifier_param->event.instrumentation; | |
1994 | event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
1995 | ||
1996 | event_notifier_enabler->base.enabled = 0; | |
1997 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
1998 | event_notifier_enabler->group = event_notifier_group; | |
1999 | ||
2000 | mutex_lock(&sessions_mutex); | |
2001 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
2002 | ||
2003 | mutex_unlock(&sessions_mutex); | |
2004 | ||
2005 | return event_notifier_enabler; | |
2006 | } | |
2007 | ||
2008 | int lttng_event_notifier_enabler_enable( | |
2009 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2010 | { | |
2011 | mutex_lock(&sessions_mutex); | |
2012 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
2013 | mutex_unlock(&sessions_mutex); | |
2014 | return 0; | |
2015 | } | |
2016 | ||
2017 | int lttng_event_notifier_enabler_disable( | |
2018 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2019 | { | |
2020 | mutex_lock(&sessions_mutex); | |
2021 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
2022 | mutex_unlock(&sessions_mutex); | |
2023 | return 0; | |
2024 | } | |
2025 | ||
2026 | int lttng_event_notifier_enabler_attach_bytecode( | |
2027 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2028 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2029 | { | |
2030 | int ret; | |
2031 | ||
2032 | ret = lttng_enabler_attach_bytecode( | |
2033 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
2034 | bytecode); | |
2035 | if (ret) | |
2036 | goto error; | |
2037 | ||
2038 | return 0; | |
2039 | ||
2040 | error: | |
2041 | return ret; | |
2042 | } | |
2043 | ||
2044 | int lttng_event_notifier_enabler_attach_context( | |
2045 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2046 | struct lttng_kernel_context *context_param) | |
2047 | { | |
2048 | return -ENOSYS; | |
2049 | } | |
2050 | ||
2051 | static | |
2052 | void lttng_event_notifier_enabler_destroy( | |
2053 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2054 | { | |
2055 | if (!event_notifier_enabler) { | |
2056 | return; | |
2057 | } | |
2058 | ||
2059 | list_del(&event_notifier_enabler->node); | |
2060 | ||
2061 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2062 | kfree(event_notifier_enabler); | |
2063 | } | |
2064 | ||
3c997079 | 2065 | /* |
b2bc0bc8 | 2066 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2067 | * session. |
2068 | * Should be called with sessions mutex held. | |
2069 | */ | |
2070 | static | |
b2bc0bc8 | 2071 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2072 | { |
b2bc0bc8 | 2073 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2074 | struct lttng_event *event; |
2075 | ||
b2bc0bc8 FD |
2076 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2077 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2078 | /* |
2079 | * For each event, if at least one of its enablers is enabled, | |
2080 | * and its channel and session transient states are enabled, we | |
2081 | * enable the event, else we disable it. | |
2082 | */ | |
2083 | list_for_each_entry(event, &session->events, list) { | |
2084 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
2085 | struct lttng_bytecode_runtime *runtime; |
2086 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2087 | |
4ecb5ad5 MD |
2088 | switch (event->instrumentation) { |
2089 | case LTTNG_KERNEL_TRACEPOINT: | |
2090 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
2091 | /* Enable events */ |
2092 | list_for_each_entry(enabler_ref, | |
2093 | &event->enablers_ref_head, node) { | |
2094 | if (enabler_ref->ref->enabled) { | |
2095 | enabled = 1; | |
2096 | break; | |
2097 | } | |
2098 | } | |
4ecb5ad5 MD |
2099 | break; |
2100 | default: | |
3c997079 MD |
2101 | /* Not handled with lazy sync. */ |
2102 | continue; | |
2103 | } | |
2104 | /* | |
2105 | * Enabled state is based on union of enablers, with | |
2106 | * intesection of session and channel transient enable | |
2107 | * states. | |
2108 | */ | |
2109 | enabled = enabled && session->tstate && event->chan->tstate; | |
2110 | ||
a8f2d0c7 | 2111 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
2112 | /* |
2113 | * Sync tracepoint registration with event enabled | |
2114 | * state. | |
2115 | */ | |
2116 | if (enabled) { | |
2117 | register_event(event); | |
2118 | } else { | |
2119 | _lttng_event_unregister(event); | |
2120 | } | |
07dfc1d0 MD |
2121 | |
2122 | /* Check if has enablers without bytecode enabled */ | |
2123 | list_for_each_entry(enabler_ref, | |
2124 | &event->enablers_ref_head, node) { | |
2125 | if (enabler_ref->ref->enabled | |
2126 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2127 | has_enablers_without_bytecode = 1; | |
2128 | break; | |
2129 | } | |
2130 | } | |
2131 | event->has_enablers_without_bytecode = | |
2132 | has_enablers_without_bytecode; | |
2133 | ||
2134 | /* Enable filters */ | |
2135 | list_for_each_entry(runtime, | |
f127e61e | 2136 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 2137 | lttng_filter_sync_state(runtime); |
3c997079 MD |
2138 | } |
2139 | } | |
2140 | ||
2141 | /* | |
2142 | * Apply enablers to session events, adding events to session if need | |
2143 | * be. It is required after each modification applied to an active | |
2144 | * session, and right before session "start". | |
2145 | * "lazy" sync means we only sync if required. | |
2146 | * Should be called with sessions mutex held. | |
2147 | */ | |
2148 | static | |
b2bc0bc8 | 2149 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2150 | { |
2151 | /* We can skip if session is not active */ | |
2152 | if (!session->active) | |
2153 | return; | |
b2bc0bc8 | 2154 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2155 | } |
2156 | ||
1ec3f75a | 2157 | /* |
d83004aa JD |
2158 | * Serialize at most one packet worth of metadata into a metadata |
2159 | * channel. | |
92d9f5e6 MD |
2160 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2161 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2162 | * allows us to do racy operations such as looking for remaining space left in | |
2163 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2164 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2165 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2166 | * Returns the number of bytes written in the channel, 0 if no data |
2167 | * was written and a negative value on error. | |
1ec3f75a | 2168 | */ |
b3b8072b | 2169 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2170 | struct channel *chan, bool *coherent) |
d83004aa JD |
2171 | { |
2172 | struct lib_ring_buffer_ctx ctx; | |
2173 | int ret = 0; | |
2174 | size_t len, reserve_len; | |
2175 | ||
f613e3e6 | 2176 | /* |
92d9f5e6 MD |
2177 | * Ensure we support mutiple get_next / put sequences followed by |
2178 | * put_next. The metadata cache lock protects reading the metadata | |
2179 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2180 | * "flush" operations on the buffer invoked by different processes. | |
2181 | * Moreover, since the metadata cache memory can be reallocated, we | |
2182 | * need to have exclusive access against updates even though we only | |
2183 | * read it. | |
f613e3e6 | 2184 | */ |
92d9f5e6 | 2185 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2186 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2187 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2188 | goto end; |
f613e3e6 | 2189 | |
9616f0bf JD |
2190 | /* Metadata regenerated, change the version. */ |
2191 | if (stream->metadata_cache->version != stream->version) | |
2192 | stream->version = stream->metadata_cache->version; | |
2193 | ||
d83004aa | 2194 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2195 | stream->metadata_in; |
9de2c215 | 2196 | if (!len) |
de23d59d | 2197 | goto end; |
d83004aa | 2198 | reserve_len = min_t(size_t, |
b3b8072b | 2199 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2200 | len); |
b3b8072b | 2201 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2202 | sizeof(char), -1); |
2203 | /* | |
2204 | * If reservation failed, return an error to the caller. | |
2205 | */ | |
b3b8072b | 2206 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2207 | if (ret != 0) { |
2208 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2209 | stream->coherent = false; |
d83004aa JD |
2210 | goto end; |
2211 | } | |
b3b8072b | 2212 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2213 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2214 | reserve_len); |
b3b8072b | 2215 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2216 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2217 | if (reserve_len < len) |
8b97fd42 MD |
2218 | stream->coherent = false; |
2219 | else | |
2220 | stream->coherent = true; | |
d83004aa JD |
2221 | ret = reserve_len; |
2222 | ||
2223 | end: | |
8b97fd42 MD |
2224 | if (coherent) |
2225 | *coherent = stream->coherent; | |
92d9f5e6 | 2226 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2227 | return ret; |
2228 | } | |
2229 | ||
8b97fd42 MD |
2230 | static |
2231 | void lttng_metadata_begin(struct lttng_session *session) | |
2232 | { | |
3e75e2a7 MD |
2233 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2234 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2235 | } |
2236 | ||
2237 | static | |
2238 | void lttng_metadata_end(struct lttng_session *session) | |
2239 | { | |
3e75e2a7 MD |
2240 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2241 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2242 | struct lttng_metadata_stream *stream; | |
2243 | ||
3e75e2a7 MD |
2244 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2245 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2246 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2247 | } |
8b97fd42 MD |
2248 | } |
2249 | ||
d83004aa JD |
2250 | /* |
2251 | * Write the metadata to the metadata cache. | |
2252 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2253 | * The metadata cache lock protects us from concurrent read access from |
2254 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2255 | * The content of the printf is printed as a single atomic metadata |
2256 | * transaction. | |
d83004aa | 2257 | */ |
a90917c3 | 2258 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2259 | const char *fmt, ...) |
2260 | { | |
c099397a | 2261 | char *str; |
d83004aa | 2262 | size_t len; |
c099397a MD |
2263 | va_list ap; |
2264 | ||
585e5dcc | 2265 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2266 | |
2267 | va_start(ap, fmt); | |
2268 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2269 | va_end(ap); | |
2270 | if (!str) | |
2271 | return -ENOMEM; | |
2272 | ||
1ec3f75a | 2273 | len = strlen(str); |
3e75e2a7 | 2274 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2275 | if (session->metadata_cache->metadata_written + len > |
2276 | session->metadata_cache->cache_alloc) { | |
2277 | char *tmp_cache_realloc; | |
2278 | unsigned int tmp_cache_alloc_size; | |
2279 | ||
2280 | tmp_cache_alloc_size = max_t(unsigned int, | |
2281 | session->metadata_cache->cache_alloc + len, | |
2282 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2283 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2284 | if (!tmp_cache_realloc) |
2285 | goto err; | |
a606b6e8 ML |
2286 | if (session->metadata_cache->data) { |
2287 | memcpy(tmp_cache_realloc, | |
2288 | session->metadata_cache->data, | |
2289 | session->metadata_cache->cache_alloc); | |
2290 | vfree(session->metadata_cache->data); | |
2291 | } | |
2292 | ||
d83004aa JD |
2293 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2294 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2295 | } |
d83004aa JD |
2296 | memcpy(session->metadata_cache->data + |
2297 | session->metadata_cache->metadata_written, | |
2298 | str, len); | |
2299 | session->metadata_cache->metadata_written += len; | |
c099397a | 2300 | kfree(str); |
d83004aa | 2301 | |
d83004aa JD |
2302 | return 0; |
2303 | ||
2304 | err: | |
2305 | kfree(str); | |
2306 | return -ENOMEM; | |
c099397a MD |
2307 | } |
2308 | ||
f513b2bf MD |
2309 | static |
2310 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2311 | { | |
2312 | size_t i; | |
2313 | ||
2314 | for (i = 0; i < nesting; i++) { | |
2315 | int ret; | |
2316 | ||
2317 | ret = lttng_metadata_printf(session, " "); | |
2318 | if (ret) { | |
2319 | return ret; | |
2320 | } | |
2321 | } | |
2322 | return 0; | |
2323 | } | |
2324 | ||
ceabb767 MD |
2325 | static |
2326 | int lttng_field_name_statedump(struct lttng_session *session, | |
2327 | const struct lttng_event_field *field, | |
2328 | size_t nesting) | |
2329 | { | |
2330 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2331 | } | |
2332 | ||
2333 | static | |
2334 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
2335 | const struct lttng_type *type, | |
2336 | size_t nesting) | |
2337 | { | |
2338 | int ret; | |
2339 | ||
2340 | WARN_ON_ONCE(type->atype != atype_integer); | |
2341 | ret = print_tabs(session, nesting); | |
2342 | if (ret) | |
2343 | return ret; | |
2344 | ret = lttng_metadata_printf(session, | |
2345 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
2346 | type->u.integer.size, | |
2347 | type->u.integer.alignment, | |
2348 | type->u.integer.signedness, | |
2349 | (type->u.integer.encoding == lttng_encode_none) | |
2350 | ? "none" | |
2351 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
2352 | ? "UTF8" | |
2353 | : "ASCII", | |
2354 | type->u.integer.base, | |
2355 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2356 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
2357 | #else | |
2358 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
2359 | #endif | |
2360 | ); | |
2361 | return ret; | |
2362 | } | |
2363 | ||
f513b2bf MD |
2364 | /* |
2365 | * Must be called with sessions_mutex held. | |
2366 | */ | |
2367 | static | |
2368 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
2369 | const struct lttng_type *type, | |
2370 | size_t nesting) | |
2371 | { | |
2372 | int ret; | |
2373 | uint32_t i, nr_fields; | |
ceabb767 MD |
2374 | unsigned int alignment; |
2375 | ||
2376 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
2377 | |
2378 | ret = print_tabs(session, nesting); | |
2379 | if (ret) | |
2380 | return ret; | |
2381 | ret = lttng_metadata_printf(session, | |
2382 | "struct {\n"); | |
2383 | if (ret) | |
2384 | return ret; | |
ceabb767 | 2385 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
2386 | for (i = 0; i < nr_fields; i++) { |
2387 | const struct lttng_event_field *iter_field; | |
2388 | ||
ceabb767 | 2389 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
2390 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2391 | if (ret) | |
2392 | return ret; | |
2393 | } | |
2394 | ret = print_tabs(session, nesting); | |
2395 | if (ret) | |
2396 | return ret; | |
ceabb767 MD |
2397 | alignment = type->u.struct_nestable.alignment; |
2398 | if (alignment) { | |
2399 | ret = lttng_metadata_printf(session, | |
2400 | "} align(%u)", | |
2401 | alignment); | |
2402 | } else { | |
2403 | ret = lttng_metadata_printf(session, | |
2404 | "}"); | |
2405 | } | |
f513b2bf MD |
2406 | return ret; |
2407 | } | |
2408 | ||
2409 | /* | |
2410 | * Must be called with sessions_mutex held. | |
2411 | */ | |
2412 | static | |
ceabb767 | 2413 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2414 | const struct lttng_event_field *field, |
2415 | size_t nesting) | |
2416 | { | |
2417 | int ret; | |
2418 | ||
2419 | ret = _lttng_struct_type_statedump(session, | |
2420 | &field->type, nesting); | |
2421 | if (ret) | |
2422 | return ret; | |
ceabb767 | 2423 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2424 | } |
2425 | ||
65c85aa6 MD |
2426 | /* |
2427 | * Must be called with sessions_mutex held. | |
2428 | */ | |
2429 | static | |
2430 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
2431 | const struct lttng_type *type, | |
2432 | size_t nesting) | |
2433 | { | |
2434 | int ret; | |
2435 | uint32_t i, nr_choices; | |
2436 | ||
ceabb767 MD |
2437 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
2438 | /* | |
2439 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
2440 | */ | |
2441 | if (type->u.variant_nestable.alignment != 0) | |
2442 | return -EINVAL; | |
65c85aa6 MD |
2443 | ret = print_tabs(session, nesting); |
2444 | if (ret) | |
2445 | return ret; | |
2446 | ret = lttng_metadata_printf(session, | |
2447 | "variant <_%s> {\n", | |
ceabb767 | 2448 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
2449 | if (ret) |
2450 | return ret; | |
ceabb767 | 2451 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
2452 | for (i = 0; i < nr_choices; i++) { |
2453 | const struct lttng_event_field *iter_field; | |
2454 | ||
ceabb767 | 2455 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
2456 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2457 | if (ret) | |
2458 | return ret; | |
2459 | } | |
2460 | ret = print_tabs(session, nesting); | |
2461 | if (ret) | |
2462 | return ret; | |
2463 | ret = lttng_metadata_printf(session, | |
2464 | "}"); | |
2465 | return ret; | |
2466 | } | |
2467 | ||
2468 | /* | |
2469 | * Must be called with sessions_mutex held. | |
2470 | */ | |
2471 | static | |
ceabb767 | 2472 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
2473 | const struct lttng_event_field *field, |
2474 | size_t nesting) | |
2475 | { | |
2476 | int ret; | |
2477 | ||
2478 | ret = _lttng_variant_type_statedump(session, | |
2479 | &field->type, nesting); | |
2480 | if (ret) | |
2481 | return ret; | |
ceabb767 | 2482 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
2483 | } |
2484 | ||
f513b2bf MD |
2485 | /* |
2486 | * Must be called with sessions_mutex held. | |
2487 | */ | |
2488 | static | |
ceabb767 | 2489 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2490 | const struct lttng_event_field *field, |
2491 | size_t nesting) | |
2492 | { | |
2493 | int ret; | |
2494 | const struct lttng_type *elem_type; | |
2495 | ||
ceabb767 MD |
2496 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
2497 | ||
2498 | if (field->type.u.array_nestable.alignment) { | |
2499 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2500 | if (ret) |
2501 | return ret; | |
ceabb767 MD |
2502 | ret = lttng_metadata_printf(session, |
2503 | "struct { } align(%u) _%s_padding;\n", | |
2504 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
2505 | field->name); | |
2506 | if (ret) | |
2507 | return ret; | |
2508 | } | |
2509 | /* | |
2510 | * Nested compound types: Only array of structures and variants are | |
2511 | * currently supported. | |
2512 | */ | |
2513 | elem_type = field->type.u.array_nestable.elem_type; | |
2514 | switch (elem_type->atype) { | |
2515 | case atype_integer: | |
2516 | case atype_struct_nestable: | |
2517 | case atype_variant_nestable: | |
2518 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2519 | if (ret) |
2520 | return ret; | |
2521 | break; | |
ceabb767 | 2522 | |
f513b2bf MD |
2523 | default: |
2524 | return -EINVAL; | |
2525 | } | |
2526 | ret = lttng_metadata_printf(session, | |
2527 | " _%s[%u];\n", | |
2528 | field->name, | |
ceabb767 | 2529 | field->type.u.array_nestable.length); |
f513b2bf MD |
2530 | return ret; |
2531 | } | |
2532 | ||
2533 | /* | |
2534 | * Must be called with sessions_mutex held. | |
2535 | */ | |
2536 | static | |
ceabb767 | 2537 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2538 | const struct lttng_event_field *field, |
2539 | size_t nesting) | |
2540 | { | |
2541 | int ret; | |
2542 | const char *length_name; | |
2543 | const struct lttng_type *elem_type; | |
2544 | ||
ceabb767 | 2545 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 2546 | |
ceabb767 MD |
2547 | length_name = field->type.u.sequence_nestable.length_name; |
2548 | ||
2549 | if (field->type.u.sequence_nestable.alignment) { | |
2550 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2551 | if (ret) |
2552 | return ret; | |
ceabb767 MD |
2553 | ret = lttng_metadata_printf(session, |
2554 | "struct { } align(%u) _%s_padding;\n", | |
2555 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
2556 | field->name); | |
2557 | if (ret) | |
2558 | return ret; | |
2559 | } | |
2560 | ||
2561 | /* | |
2562 | * Nested compound types: Only array of structures and variants are | |
2563 | * currently supported. | |
2564 | */ | |
2565 | elem_type = field->type.u.sequence_nestable.elem_type; | |
2566 | switch (elem_type->atype) { | |
2567 | case atype_integer: | |
2568 | case atype_struct_nestable: | |
2569 | case atype_variant_nestable: | |
2570 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2571 | if (ret) |
2572 | return ret; | |
2573 | break; | |
ceabb767 | 2574 | |
f513b2bf MD |
2575 | default: |
2576 | return -EINVAL; | |
2577 | } | |
2578 | ret = lttng_metadata_printf(session, | |
2579 | " _%s[ _%s ];\n", | |
2580 | field->name, | |
ceabb767 | 2581 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
2582 | return ret; |
2583 | } | |
2584 | ||
141ddf28 MD |
2585 | /* |
2586 | * Must be called with sessions_mutex held. | |
2587 | */ | |
2588 | static | |
ceabb767 MD |
2589 | int _lttng_enum_type_statedump(struct lttng_session *session, |
2590 | const struct lttng_type *type, | |
141ddf28 MD |
2591 | size_t nesting) |
2592 | { | |
2593 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 2594 | const struct lttng_type *container_type; |
141ddf28 MD |
2595 | int ret; |
2596 | unsigned int i, nr_entries; | |
2597 | ||
ceabb767 MD |
2598 | container_type = type->u.enum_nestable.container_type; |
2599 | if (container_type->atype != atype_integer) { | |
2600 | ret = -EINVAL; | |
2601 | goto end; | |
2602 | } | |
2603 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
2604 | nr_entries = enum_desc->nr_entries; |
2605 | ||
2606 | ret = print_tabs(session, nesting); | |
2607 | if (ret) | |
2608 | goto end; | |
ceabb767 MD |
2609 | ret = lttng_metadata_printf(session, "enum : "); |
2610 | if (ret) | |
2611 | goto end; | |
2612 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 2613 | if (ret) |
ceabb767 MD |
2614 | goto end; |
2615 | ret = lttng_metadata_printf(session, " {\n"); | |
2616 | if (ret) | |
2617 | goto end; | |
141ddf28 MD |
2618 | /* Dump all entries */ |
2619 | for (i = 0; i < nr_entries; i++) { | |
2620 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2621 | int j, len; | |
2622 | ||
2623 | ret = print_tabs(session, nesting + 1); | |
2624 | if (ret) | |
2625 | goto end; | |
2626 | ret = lttng_metadata_printf(session, | |
2627 | "\""); | |
2628 | if (ret) | |
2629 | goto end; | |
2630 | len = strlen(entry->string); | |
2631 | /* Escape the character '"' */ | |
2632 | for (j = 0; j < len; j++) { | |
2633 | char c = entry->string[j]; | |
2634 | ||
2635 | switch (c) { | |
2636 | case '"': | |
2637 | ret = lttng_metadata_printf(session, | |
2638 | "\\\""); | |
2639 | break; | |
2640 | case '\\': | |
2641 | ret = lttng_metadata_printf(session, | |
2642 | "\\\\"); | |
2643 | break; | |
2644 | default: | |
2645 | ret = lttng_metadata_printf(session, | |
2646 | "%c", c); | |
2647 | break; | |
2648 | } | |
2649 | if (ret) | |
2650 | goto end; | |
2651 | } | |
08ad1061 PP |
2652 | ret = lttng_metadata_printf(session, "\""); |
2653 | if (ret) | |
2654 | goto end; | |
2655 | ||
2656 | if (entry->options.is_auto) { | |
2657 | ret = lttng_metadata_printf(session, ",\n"); | |
2658 | if (ret) | |
2659 | goto end; | |
141ddf28 | 2660 | } else { |
7c559490 MD |
2661 | ret = lttng_metadata_printf(session, |
2662 | " = "); | |
2663 | if (ret) | |
2664 | goto end; | |
2665 | if (entry->start.signedness) | |
141ddf28 | 2666 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2667 | "%lld", (long long) entry->start.value); |
2668 | else | |
2669 | ret = lttng_metadata_printf(session, | |
2670 | "%llu", entry->start.value); | |
2671 | if (ret) | |
2672 | goto end; | |
2673 | if (entry->start.signedness == entry->end.signedness && | |
2674 | entry->start.value | |
2675 | == entry->end.value) { | |
141ddf28 | 2676 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2677 | ",\n"); |
2678 | } else { | |
2679 | if (entry->end.signedness) { | |
2680 | ret = lttng_metadata_printf(session, | |
2681 | " ... %lld,\n", | |
2682 | (long long) entry->end.value); | |
2683 | } else { | |
2684 | ret = lttng_metadata_printf(session, | |
2685 | " ... %llu,\n", | |
2686 | entry->end.value); | |
2687 | } | |
141ddf28 | 2688 | } |
7c559490 MD |
2689 | if (ret) |
2690 | goto end; | |
141ddf28 | 2691 | } |
141ddf28 MD |
2692 | } |
2693 | ret = print_tabs(session, nesting); | |
2694 | if (ret) | |
2695 | goto end; | |
ceabb767 | 2696 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
2697 | end: |
2698 | return ret; | |
2699 | } | |
2700 | ||
d83004aa JD |
2701 | /* |
2702 | * Must be called with sessions_mutex held. | |
2703 | */ | |
c099397a | 2704 | static |
ceabb767 MD |
2705 | int _lttng_enum_field_statedump(struct lttng_session *session, |
2706 | const struct lttng_event_field *field, | |
2707 | size_t nesting) | |
2708 | { | |
2709 | int ret; | |
2710 | ||
2711 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
2712 | if (ret) | |
2713 | return ret; | |
2714 | return lttng_field_name_statedump(session, field, nesting); | |
2715 | } | |
2716 | ||
2717 | static | |
2718 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
2719 | const struct lttng_event_field *field, | |
2720 | size_t nesting) | |
2721 | { | |
2722 | int ret; | |
2723 | ||
2724 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
2725 | if (ret) | |
2726 | return ret; | |
2727 | return lttng_field_name_statedump(session, field, nesting); | |
2728 | } | |
2729 | ||
2730 | static | |
2731 | int _lttng_string_type_statedump(struct lttng_session *session, | |
2732 | const struct lttng_type *type, | |
2733 | size_t nesting) | |
2734 | { | |
2735 | int ret; | |
2736 | ||
2737 | WARN_ON_ONCE(type->atype != atype_string); | |
2738 | /* Default encoding is UTF8 */ | |
2739 | ret = print_tabs(session, nesting); | |
2740 | if (ret) | |
2741 | return ret; | |
2742 | ret = lttng_metadata_printf(session, | |
2743 | "string%s", | |
2744 | type->u.string.encoding == lttng_encode_ASCII ? | |
2745 | " { encoding = ASCII; }" : ""); | |
2746 | return ret; | |
2747 | } | |
2748 | ||
2749 | static | |
2750 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
2751 | const struct lttng_event_field *field, |
2752 | size_t nesting) | |
ceabb767 MD |
2753 | { |
2754 | int ret; | |
2755 | ||
2756 | WARN_ON_ONCE(field->type.atype != atype_string); | |
2757 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
2758 | if (ret) | |
2759 | return ret; | |
2760 | return lttng_field_name_statedump(session, field, nesting); | |
2761 | } | |
2762 | ||
2763 | /* | |
2764 | * Must be called with sessions_mutex held. | |
2765 | */ | |
2766 | static | |
2767 | int _lttng_type_statedump(struct lttng_session *session, | |
2768 | const struct lttng_type *type, | |
2769 | size_t nesting) | |
c099397a | 2770 | { |
c099397a | 2771 | int ret = 0; |
c099397a | 2772 | |
ceabb767 | 2773 | switch (type->atype) { |
8070f5c0 | 2774 | case atype_integer: |
ceabb767 | 2775 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 2776 | break; |
ceabb767 MD |
2777 | case atype_enum_nestable: |
2778 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 2779 | break; |
ceabb767 MD |
2780 | case atype_string: |
2781 | ret = _lttng_string_type_statedump(session, type, nesting); | |
2782 | break; | |
2783 | case atype_struct_nestable: | |
2784 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 2785 | break; |
ceabb767 MD |
2786 | case atype_variant_nestable: |
2787 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
2788 | break; | |
2789 | ||
2790 | /* Nested arrays and sequences are not supported yet. */ | |
2791 | case atype_array_nestable: | |
2792 | case atype_sequence_nestable: | |
2793 | default: | |
2794 | WARN_ON_ONCE(1); | |
2795 | return -EINVAL; | |
8070f5c0 | 2796 | } |
ceabb767 MD |
2797 | return ret; |
2798 | } | |
8070f5c0 | 2799 | |
ceabb767 MD |
2800 | /* |
2801 | * Must be called with sessions_mutex held. | |
2802 | */ | |
2803 | static | |
2804 | int _lttng_field_statedump(struct lttng_session *session, | |
2805 | const struct lttng_event_field *field, | |
2806 | size_t nesting) | |
2807 | { | |
2808 | int ret = 0; | |
27d2368e | 2809 | |
ceabb767 MD |
2810 | switch (field->type.atype) { |
2811 | case atype_integer: | |
2812 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
2813 | break; | |
2814 | case atype_enum_nestable: | |
2815 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 2816 | break; |
8070f5c0 | 2817 | case atype_string: |
ceabb767 | 2818 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 2819 | break; |
ceabb767 MD |
2820 | case atype_struct_nestable: |
2821 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 2822 | break; |
ceabb767 MD |
2823 | case atype_array_nestable: |
2824 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 2825 | break; |
ceabb767 MD |
2826 | case atype_sequence_nestable: |
2827 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 2828 | break; |
ceabb767 MD |
2829 | case atype_variant_nestable: |
2830 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 2831 | break; |
f513b2bf | 2832 | |
8070f5c0 MD |
2833 | default: |
2834 | WARN_ON_ONCE(1); | |
2835 | return -EINVAL; | |
2836 | } | |
2837 | return ret; | |
2838 | } | |
2839 | ||
2840 | static | |
a90917c3 | 2841 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2842 | struct lttng_ctx *ctx) |
2843 | { | |
2844 | int ret = 0; | |
2845 | int i; | |
2846 | ||
2847 | if (!ctx) | |
2848 | return 0; | |
2849 | for (i = 0; i < ctx->nr_fields; i++) { | |
2850 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2851 | ||
f513b2bf | 2852 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2853 | if (ret) |
2854 | return ret; | |
2855 | } | |
2856 | return ret; | |
2857 | } | |
2858 | ||
2859 | static | |
a90917c3 MD |
2860 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2861 | struct lttng_event *event) | |
8070f5c0 MD |
2862 | { |
2863 | const struct lttng_event_desc *desc = event->desc; | |
2864 | int ret = 0; | |
2865 | int i; | |
2866 | ||
2867 | for (i = 0; i < desc->nr_fields; i++) { | |
2868 | const struct lttng_event_field *field = &desc->fields[i]; | |
2869 | ||
f513b2bf | 2870 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2871 | if (ret) |
2872 | return ret; | |
c099397a MD |
2873 | } |
2874 | return ret; | |
2875 | } | |
2876 | ||
d83004aa JD |
2877 | /* |
2878 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
2879 | * The entire event metadata is printed as a single atomic metadata |
2880 | * transaction. | |
d83004aa | 2881 | */ |
c099397a | 2882 | static |
a90917c3 MD |
2883 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2884 | struct lttng_channel *chan, | |
2885 | struct lttng_event *event) | |
c099397a MD |
2886 | { |
2887 | int ret = 0; | |
2888 | ||
585e5dcc | 2889 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 2890 | return 0; |
d83004aa | 2891 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2892 | return 0; |
2893 | ||
8b97fd42 MD |
2894 | lttng_metadata_begin(session); |
2895 | ||
c099397a MD |
2896 | ret = lttng_metadata_printf(session, |
2897 | "event {\n" | |
ae734547 | 2898 | " name = \"%s\";\n" |
c099397a | 2899 | " id = %u;\n" |
b9074a1b | 2900 | " stream_id = %u;\n", |
c099397a MD |
2901 | event->desc->name, |
2902 | event->id, | |
2903 | event->chan->id); | |
2904 | if (ret) | |
2905 | goto end; | |
2906 | ||
b9074a1b MD |
2907 | if (event->ctx) { |
2908 | ret = lttng_metadata_printf(session, | |
2909 | " context := struct {\n"); | |
2910 | if (ret) | |
2911 | goto end; | |
2912 | } | |
a90917c3 | 2913 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2914 | if (ret) |
2915 | goto end; | |
b9074a1b MD |
2916 | if (event->ctx) { |
2917 | ret = lttng_metadata_printf(session, | |
2918 | " };\n"); | |
2919 | if (ret) | |
2920 | goto end; | |
2921 | } | |
8070f5c0 MD |
2922 | |
2923 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2924 | " fields := struct {\n" |
2925 | ); | |
2926 | if (ret) | |
2927 | goto end; | |
2928 | ||
a90917c3 | 2929 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2930 | if (ret) |
2931 | goto end; | |
2932 | ||
2933 | /* | |
2934 | * LTTng space reservation can only reserve multiples of the | |
2935 | * byte size. | |
2936 | */ | |
2937 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2938 | " };\n" |
2939 | "};\n\n"); | |
c099397a MD |
2940 | if (ret) |
2941 | goto end; | |
2942 | ||
c099397a MD |
2943 | event->metadata_dumped = 1; |
2944 | end: | |
8b97fd42 | 2945 | lttng_metadata_end(session); |
c099397a MD |
2946 | return ret; |
2947 | ||
2948 | } | |
2949 | ||
d83004aa JD |
2950 | /* |
2951 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
2952 | * The entire channel metadata is printed as a single atomic metadata |
2953 | * transaction. | |
d83004aa | 2954 | */ |
c099397a | 2955 | static |
a90917c3 MD |
2956 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2957 | struct lttng_channel *chan) | |
c099397a MD |
2958 | { |
2959 | int ret = 0; | |
2960 | ||
585e5dcc | 2961 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 2962 | return 0; |
d83004aa JD |
2963 | |
2964 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2965 | return 0; |
2966 | ||
8b97fd42 MD |
2967 | lttng_metadata_begin(session); |
2968 | ||
c099397a MD |
2969 | WARN_ON_ONCE(!chan->header_type); |
2970 | ret = lttng_metadata_printf(session, | |
2971 | "stream {\n" | |
2972 | " id = %u;\n" | |
9115fbdc | 2973 | " event.header := %s;\n" |
b9074a1b | 2974 | " packet.context := struct packet_context;\n", |
c099397a MD |
2975 | chan->id, |
2976 | chan->header_type == 1 ? "struct event_header_compact" : | |
2977 | "struct event_header_large"); | |
2978 | if (ret) | |
2979 | goto end; | |
2980 | ||
b9074a1b MD |
2981 | if (chan->ctx) { |
2982 | ret = lttng_metadata_printf(session, | |
2983 | " event.context := struct {\n"); | |
2984 | if (ret) | |
2985 | goto end; | |
2986 | } | |
a90917c3 | 2987 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2988 | if (ret) |
2989 | goto end; | |
b9074a1b MD |
2990 | if (chan->ctx) { |
2991 | ret = lttng_metadata_printf(session, | |
2992 | " };\n"); | |
2993 | if (ret) | |
2994 | goto end; | |
2995 | } | |
8070f5c0 MD |
2996 | |
2997 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2998 | "};\n\n"); |
8070f5c0 | 2999 | |
c099397a MD |
3000 | chan->metadata_dumped = 1; |
3001 | end: | |
8b97fd42 | 3002 | lttng_metadata_end(session); |
c099397a MD |
3003 | return ret; |
3004 | } | |
3005 | ||
d83004aa JD |
3006 | /* |
3007 | * Must be called with sessions_mutex held. | |
3008 | */ | |
9115fbdc | 3009 | static |
a90917c3 | 3010 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3011 | { |
3012 | return lttng_metadata_printf(session, | |
3013 | "struct packet_context {\n" | |
a3ccff4f MD |
3014 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3015 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3016 | " uint64_t content_size;\n" |
3017 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3018 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3019 | " unsigned long events_discarded;\n" |
9115fbdc | 3020 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3021 | "};\n\n" |
9115fbdc MD |
3022 | ); |
3023 | } | |
3024 | ||
3025 | /* | |
3026 | * Compact header: | |
3027 | * id: range: 0 - 30. | |
3028 | * id 31 is reserved to indicate an extended header. | |
3029 | * | |
3030 | * Large header: | |
3031 | * id: range: 0 - 65534. | |
3032 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3033 | * |
3034 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3035 | */ |
3036 | static | |
a90917c3 | 3037 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3038 | { |
3039 | return lttng_metadata_printf(session, | |
3040 | "struct event_header_compact {\n" | |
3041 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3042 | " variant <id> {\n" | |
3043 | " struct {\n" | |
a3ccff4f | 3044 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3045 | " } compact;\n" |
3046 | " struct {\n" | |
3047 | " uint32_t id;\n" | |
a3ccff4f | 3048 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3049 | " } extended;\n" |
3050 | " } v;\n" | |
3051 | "} align(%u);\n" | |
3052 | "\n" | |
3053 | "struct event_header_large {\n" | |
3054 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3055 | " variant <id> {\n" | |
3056 | " struct {\n" | |
a3ccff4f | 3057 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3058 | " } compact;\n" |
3059 | " struct {\n" | |
3060 | " uint32_t id;\n" | |
a3ccff4f | 3061 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3062 | " } extended;\n" |
3063 | " } v;\n" | |
3064 | "} align(%u);\n\n", | |
a90917c3 MD |
3065 | lttng_alignof(uint32_t) * CHAR_BIT, |
3066 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3067 | ); |
3068 | } | |
3069 | ||
a3ccff4f MD |
3070 | /* |
3071 | * Approximation of NTP time of day to clock monotonic correlation, | |
3072 | * taken at start of trace. | |
3073 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3074 | * in future versions. | |
5283350b MD |
3075 | * This function may return a negative offset. It may happen if the |
3076 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3077 | * |
3078 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3079 | * y2038 compliant. | |
a3ccff4f MD |
3080 | */ |
3081 | static | |
8967b2a3 | 3082 | int64_t measure_clock_offset(void) |
a3ccff4f | 3083 | { |
dcb93448 | 3084 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3085 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3086 | int64_t offset; |
a3ccff4f | 3087 | unsigned long flags; |
3636085f MJ |
3088 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3089 | struct timespec64 rts = { 0, 0 }; | |
3090 | #else | |
3091 | struct timespec rts = { 0, 0 }; | |
3092 | #endif | |
a3ccff4f MD |
3093 | |
3094 | /* Disable interrupts to increase correlation precision. */ | |
3095 | local_irq_save(flags); | |
3096 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3097 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3098 | ktime_get_real_ts64(&rts); | |
3099 | #else | |
216b6baa | 3100 | getnstimeofday(&rts); |
3636085f | 3101 | #endif |
a3ccff4f MD |
3102 | monotonic[1] = trace_clock_read64(); |
3103 | local_irq_restore(flags); | |
3104 | ||
dcb93448 | 3105 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3106 | realtime = (uint64_t) rts.tv_sec * tcf; |
3107 | if (tcf == NSEC_PER_SEC) { | |
3108 | realtime += rts.tv_nsec; | |
3109 | } else { | |
3110 | uint64_t n = rts.tv_nsec * tcf; | |
3111 | ||
3112 | do_div(n, NSEC_PER_SEC); | |
3113 | realtime += n; | |
3114 | } | |
dcb93448 | 3115 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3116 | return offset; |
3117 | } | |
3118 | ||
3eb95be4 JR |
3119 | static |
3120 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3121 | { | |
0f3eaad4 | 3122 | int ret = 0; |
3eb95be4 JR |
3123 | size_t i; |
3124 | char cur; | |
3125 | ||
3126 | i = 0; | |
3127 | cur = string[i]; | |
3128 | while (cur != '\0') { | |
3129 | switch (cur) { | |
3130 | case '\n': | |
3131 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3132 | break; | |
3133 | case '\\': | |
3134 | case '"': | |
3135 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3136 | if (ret) | |
3137 | goto error; | |
3138 | /* We still print the current char */ | |
3139 | /* Fallthrough */ | |
3140 | default: | |
3141 | ret = lttng_metadata_printf(session, "%c", cur); | |
3142 | break; | |
3143 | } | |
3144 | ||
3145 | if (ret) | |
3146 | goto error; | |
3147 | ||
3148 | cur = string[++i]; | |
3149 | } | |
3150 | error: | |
3151 | return ret; | |
3152 | } | |
3153 | ||
3154 | static | |
1c88f269 JR |
3155 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3156 | const char *field_value) | |
3eb95be4 JR |
3157 | { |
3158 | int ret; | |
3159 | ||
1c88f269 | 3160 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3161 | if (ret) |
3162 | goto error; | |
3163 | ||
1c88f269 | 3164 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3165 | if (ret) |
3166 | goto error; | |
3167 | ||
3168 | ret = lttng_metadata_printf(session, "\";\n"); | |
3169 | ||
3170 | error: | |
3171 | return ret; | |
3172 | } | |
3173 | ||
c099397a MD |
3174 | /* |
3175 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3176 | * Must be called with sessions_mutex held. |
c099397a MD |
3177 | */ |
3178 | static | |
a90917c3 | 3179 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3180 | { |
30bdb6e4 | 3181 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3182 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3183 | const char *product_uuid; |
a90917c3 MD |
3184 | struct lttng_channel *chan; |
3185 | struct lttng_event *event; | |
c099397a MD |
3186 | int ret = 0; |
3187 | ||
585e5dcc | 3188 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3189 | return 0; |
8b97fd42 MD |
3190 | |
3191 | lttng_metadata_begin(session); | |
3192 | ||
c099397a MD |
3193 | if (session->metadata_dumped) |
3194 | goto skip_session; | |
c099397a | 3195 | |
d793d5e1 | 3196 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3197 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3198 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3199 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3200 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3201 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3202 | |
3203 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3204 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3205 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3206 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3207 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3208 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3209 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3210 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3211 | "\n" |
3212 | "trace {\n" | |
3213 | " major = %u;\n" | |
3214 | " minor = %u;\n" | |
30bdb6e4 | 3215 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3216 | " byte_order = %s;\n" |
3217 | " packet.header := struct {\n" | |
3218 | " uint32_t magic;\n" | |
1ec3f75a | 3219 | " uint8_t uuid[16];\n" |
d793d5e1 | 3220 | " uint32_t stream_id;\n" |
5594698f | 3221 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3222 | " };\n" |
d793d5e1 | 3223 | "};\n\n", |
a90917c3 MD |
3224 | lttng_alignof(uint8_t) * CHAR_BIT, |
3225 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3226 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3227 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3228 | sizeof(unsigned long) * CHAR_BIT, |
3229 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3230 | CTF_SPEC_MAJOR, |
3231 | CTF_SPEC_MINOR, | |
d793d5e1 | 3232 | uuid_s, |
5214fa50 | 3233 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3234 | "be" |
3235 | #else | |
3236 | "le" | |
3237 | #endif | |
3238 | ); | |
3239 | if (ret) | |
3240 | goto end; | |
3241 | ||
99dc9597 MD |
3242 | ret = lttng_metadata_printf(session, |
3243 | "env {\n" | |
a6058143 | 3244 | " hostname = \"%s\";\n" |
c6c9e10f | 3245 | " domain = \"kernel\";\n" |
99dc9597 | 3246 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3247 | " kernel_release = \"%s\";\n" |
3248 | " kernel_version = \"%s\";\n" | |
3249 | " tracer_name = \"lttng-modules\";\n" | |
3250 | " tracer_major = %d;\n" | |
3251 | " tracer_minor = %d;\n" | |
3252 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3253 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3254 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3255 | utsname()->sysname, |
3256 | utsname()->release, | |
c6c9e10f MD |
3257 | utsname()->version, |
3258 | LTTNG_MODULES_MAJOR_VERSION, | |
3259 | LTTNG_MODULES_MINOR_VERSION, | |
3260 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3261 | ); |
3262 | if (ret) | |
3263 | goto end; | |
3264 | ||
1c88f269 JR |
3265 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3266 | if (ret) | |
3267 | goto end; | |
3268 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3269 | session->creation_time); | |
3eb95be4 JR |
3270 | if (ret) |
3271 | goto end; | |
3272 | ||
c88f762e GB |
3273 | /* Add the product UUID to the 'env' section */ |
3274 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3275 | if (product_uuid) { | |
3276 | ret = lttng_metadata_printf(session, | |
3277 | " product_uuid = \"%s\";\n", | |
3278 | product_uuid | |
3279 | ); | |
3280 | if (ret) | |
3281 | goto end; | |
3282 | } | |
3283 | ||
3284 | /* Close the 'env' section */ | |
3eb95be4 JR |
3285 | ret = lttng_metadata_printf(session, "};\n\n"); |
3286 | if (ret) | |
3287 | goto end; | |
3288 | ||
a3ccff4f MD |
3289 | ret = lttng_metadata_printf(session, |
3290 | "clock {\n" | |
2754583e MD |
3291 | " name = \"%s\";\n", |
3292 | trace_clock_name() | |
a82c63f1 MD |
3293 | ); |
3294 | if (ret) | |
3295 | goto end; | |
3296 | ||
3297 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3298 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3299 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3300 | clock_uuid_s |
3301 | ); | |
3302 | if (ret) | |
3303 | goto end; | |
3304 | } | |
3305 | ||
3306 | ret = lttng_metadata_printf(session, | |
2754583e | 3307 | " description = \"%s\";\n" |
a3ccff4f MD |
3308 | " freq = %llu; /* Frequency, in Hz */\n" |
3309 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3310 | " offset = %lld;\n" |
a3ccff4f | 3311 | "};\n\n", |
2754583e | 3312 | trace_clock_description(), |
a3ccff4f | 3313 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3314 | (long long) measure_clock_offset() |
a3ccff4f MD |
3315 | ); |
3316 | if (ret) | |
3317 | goto end; | |
3318 | ||
3319 | ret = lttng_metadata_printf(session, | |
3320 | "typealias integer {\n" | |
3321 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3322 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3323 | "} := uint27_clock_monotonic_t;\n" |
3324 | "\n" | |
3325 | "typealias integer {\n" | |
3326 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3327 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3328 | "} := uint32_clock_monotonic_t;\n" |
3329 | "\n" | |
3330 | "typealias integer {\n" | |
3331 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3332 | " map = clock.%s.value;\n" |
a3ccff4f | 3333 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3334 | trace_clock_name(), |
a3ccff4f | 3335 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3336 | trace_clock_name(), |
3337 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3338 | trace_clock_name() | |
a3ccff4f MD |
3339 | ); |
3340 | if (ret) | |
3341 | goto end; | |
3342 | ||
a90917c3 | 3343 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3344 | if (ret) |
3345 | goto end; | |
3346 | ||
a90917c3 | 3347 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3348 | if (ret) |
3349 | goto end; | |
3350 | ||
c099397a MD |
3351 | skip_session: |
3352 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 3353 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
3354 | if (ret) |
3355 | goto end; | |
3356 | } | |
3357 | ||
3358 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 3359 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
3360 | if (ret) |
3361 | goto end; | |
3362 | } | |
3363 | session->metadata_dumped = 1; | |
3364 | end: | |
8b97fd42 | 3365 | lttng_metadata_end(session); |
c099397a MD |
3366 | return ret; |
3367 | } | |
3368 | ||
c0e31d2e | 3369 | /** |
a90917c3 | 3370 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3371 | * @transport: transport structure |
3372 | * | |
3373 | * Registers a transport which can be used as output to extract the data out of | |
3374 | * LTTng. The module calling this registration function must ensure that no | |
3375 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3376 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3377 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3378 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3379 | * after its registration must it synchronize the TLBs. |
3380 | */ | |
a90917c3 | 3381 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3382 | { |
3383 | /* | |
3384 | * Make sure no page fault can be triggered by the module about to be | |
3385 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3386 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3387 | */ |
263b6c88 | 3388 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3389 | |
3390 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3391 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3392 | mutex_unlock(&sessions_mutex); |
3393 | } | |
a90917c3 | 3394 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3395 | |
3396 | /** | |
a90917c3 | 3397 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
3398 | * @transport: transport structure |
3399 | */ | |
a90917c3 | 3400 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
3401 | { |
3402 | mutex_lock(&sessions_mutex); | |
3403 | list_del(&transport->node); | |
3404 | mutex_unlock(&sessions_mutex); | |
3405 | } | |
a90917c3 | 3406 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 3407 | |
894ce5dc | 3408 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
3409 | |
3410 | enum cpuhp_state lttng_hp_prepare; | |
3411 | enum cpuhp_state lttng_hp_online; | |
3412 | ||
3413 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
3414 | { | |
3415 | struct lttng_cpuhp_node *lttng_node; | |
3416 | ||
3417 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3418 | switch (lttng_node->component) { | |
3419 | case LTTNG_RING_BUFFER_FRONTEND: | |
3420 | return 0; | |
3421 | case LTTNG_RING_BUFFER_BACKEND: | |
3422 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
3423 | case LTTNG_RING_BUFFER_ITER: | |
3424 | return 0; | |
3425 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3426 | return 0; | |
3427 | default: | |
3428 | return -EINVAL; | |
3429 | } | |
3430 | } | |
3431 | ||
3432 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
3433 | { | |
3434 | struct lttng_cpuhp_node *lttng_node; | |
3435 | ||
3436 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3437 | switch (lttng_node->component) { | |
3438 | case LTTNG_RING_BUFFER_FRONTEND: | |
3439 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
3440 | case LTTNG_RING_BUFFER_BACKEND: | |
3441 | return 0; | |
3442 | case LTTNG_RING_BUFFER_ITER: | |
3443 | return 0; | |
3444 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3445 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
3446 | default: | |
3447 | return -EINVAL; | |
3448 | } | |
3449 | } | |
3450 | ||
3451 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
3452 | { | |
3453 | struct lttng_cpuhp_node *lttng_node; | |
3454 | ||
3455 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3456 | switch (lttng_node->component) { | |
3457 | case LTTNG_RING_BUFFER_FRONTEND: | |
3458 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
3459 | case LTTNG_RING_BUFFER_BACKEND: | |
3460 | return 0; | |
3461 | case LTTNG_RING_BUFFER_ITER: | |
3462 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
3463 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3464 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
3465 | default: | |
3466 | return -EINVAL; | |
3467 | } | |
3468 | } | |
3469 | ||
3470 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
3471 | { | |
3472 | struct lttng_cpuhp_node *lttng_node; | |
3473 | ||
3474 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3475 | switch (lttng_node->component) { | |
3476 | case LTTNG_RING_BUFFER_FRONTEND: | |
3477 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
3478 | case LTTNG_RING_BUFFER_BACKEND: | |
3479 | return 0; | |
3480 | case LTTNG_RING_BUFFER_ITER: | |
3481 | return 0; | |
3482 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3483 | return 0; | |
3484 | default: | |
3485 | return -EINVAL; | |
3486 | } | |
3487 | } | |
3488 | ||
3489 | static int __init lttng_init_cpu_hotplug(void) | |
3490 | { | |
3491 | int ret; | |
3492 | ||
3493 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
3494 | lttng_hotplug_prepare, | |
3495 | lttng_hotplug_dead); | |
3496 | if (ret < 0) { | |
3497 | return ret; | |
3498 | } | |
3499 | lttng_hp_prepare = ret; | |
3500 | lttng_rb_set_hp_prepare(ret); | |
3501 | ||
3502 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
3503 | lttng_hotplug_online, | |
3504 | lttng_hotplug_offline); | |
3505 | if (ret < 0) { | |
3506 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3507 | lttng_hp_prepare = 0; | |
3508 | return ret; | |
3509 | } | |
3510 | lttng_hp_online = ret; | |
3511 | lttng_rb_set_hp_online(ret); | |
3512 | ||
3513 | return 0; | |
3514 | } | |
3515 | ||
3516 | static void __exit lttng_exit_cpu_hotplug(void) | |
3517 | { | |
3518 | lttng_rb_set_hp_online(0); | |
3519 | cpuhp_remove_multi_state(lttng_hp_online); | |
3520 | lttng_rb_set_hp_prepare(0); | |
3521 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3522 | } | |
3523 | ||
1ee63d8d | 3524 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3525 | static int lttng_init_cpu_hotplug(void) |
3526 | { | |
3527 | return 0; | |
3528 | } | |
3529 | static void lttng_exit_cpu_hotplug(void) | |
3530 | { | |
3531 | } | |
1ee63d8d | 3532 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3533 | |
3534 | ||
a90917c3 | 3535 | static int __init lttng_events_init(void) |
4e3c1b9b | 3536 | { |
1c25284c MD |
3537 | int ret; |
3538 | ||
453b2495 JD |
3539 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
3540 | if (ret) | |
3541 | return ret; | |
389d7070 | 3542 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
3543 | if (ret) |
3544 | return ret; | |
3545 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
3546 | if (ret) |
3547 | return ret; | |
3548 | ret = lttng_probes_init(); | |
389d7070 MD |
3549 | if (ret) |
3550 | return ret; | |
07dfc1d0 | 3551 | ret = lttng_context_init(); |
20591cf7 MD |
3552 | if (ret) |
3553 | return ret; | |
07dfc1d0 MD |
3554 | ret = lttng_tracepoint_init(); |
3555 | if (ret) | |
3556 | goto error_tp; | |
a90917c3 | 3557 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
3558 | if (!event_cache) { |
3559 | ret = -ENOMEM; | |
dffef45d FD |
3560 | goto error_kmem_event; |
3561 | } | |
3562 | event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0); | |
3563 | if (!event_notifier_cache) { | |
3564 | ret = -ENOMEM; | |
3565 | goto error_kmem_event_notifier; | |
20591cf7 | 3566 | } |
80996790 | 3567 | ret = lttng_abi_init(); |
02119ee5 MD |
3568 | if (ret) |
3569 | goto error_abi; | |
0c956676 MD |
3570 | ret = lttng_logger_init(); |
3571 | if (ret) | |
3572 | goto error_logger; | |
1e367326 MD |
3573 | ret = lttng_init_cpu_hotplug(); |
3574 | if (ret) | |
3575 | goto error_hotplug; | |
101215b7 | 3576 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3577 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3578 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3579 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3580 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3581 | LTTNG_VERSION_NAME, |
3582 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3583 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3584 | #else | |
3585 | "", | |
3586 | #endif | |
3587 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3588 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3589 | #else | |
3590 | ""); | |
3591 | #endif | |
4e3c1b9b | 3592 | return 0; |
0c956676 | 3593 | |
1e367326 MD |
3594 | error_hotplug: |
3595 | lttng_logger_exit(); | |
0c956676 MD |
3596 | error_logger: |
3597 | lttng_abi_exit(); | |
02119ee5 | 3598 | error_abi: |
dffef45d FD |
3599 | kmem_cache_destroy(event_notifier_cache); |
3600 | error_kmem_event_notifier: | |
1c25284c | 3601 | kmem_cache_destroy(event_cache); |
dffef45d | 3602 | error_kmem_event: |
20591cf7 | 3603 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
3604 | error_tp: |
3605 | lttng_context_exit(); | |
101215b7 | 3606 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3607 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3608 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3609 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3610 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3611 | LTTNG_VERSION_NAME, |
3612 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3613 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3614 | #else | |
3615 | "", | |
3616 | #endif | |
3617 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3618 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3619 | #else | |
3620 | ""); | |
3621 | #endif | |
1c25284c | 3622 | return ret; |
4e3c1b9b MD |
3623 | } |
3624 | ||
a90917c3 | 3625 | module_init(lttng_events_init); |
11b5a3c2 | 3626 | |
a90917c3 | 3627 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 3628 | { |
a90917c3 | 3629 | struct lttng_session *session, *tmpsession; |
92e94819 | 3630 | |
1e367326 | 3631 | lttng_exit_cpu_hotplug(); |
0c956676 | 3632 | lttng_logger_exit(); |
80996790 | 3633 | lttng_abi_exit(); |
92e94819 | 3634 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 3635 | lttng_session_destroy(session); |
11b5a3c2 | 3636 | kmem_cache_destroy(event_cache); |
dffef45d | 3637 | kmem_cache_destroy(event_notifier_cache); |
20591cf7 | 3638 | lttng_tracepoint_exit(); |
07dfc1d0 | 3639 | lttng_context_exit(); |
101215b7 | 3640 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3641 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3642 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3643 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3644 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3645 | LTTNG_VERSION_NAME, |
3646 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3647 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3648 | #else | |
3649 | "", | |
3650 | #endif | |
3651 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3652 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3653 | #else | |
3654 | ""); | |
3655 | #endif | |
4e3c1b9b | 3656 | } |
92e94819 | 3657 | |
a90917c3 | 3658 | module_exit(lttng_events_exit); |
11b5a3c2 | 3659 | |
7ca11e77 | 3660 | #include <generated/patches.h> |
101215b7 MJ |
3661 | #ifdef LTTNG_EXTRA_VERSION_GIT |
3662 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3663 | #endif | |
3664 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3665 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3666 | #endif | |
92e94819 MD |
3667 | MODULE_LICENSE("GPL and additional rights"); |
3668 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3669 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3670 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3671 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3672 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3673 | LTTNG_MODULES_EXTRAVERSION); |