Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
8c6e7f13 | 27 | #include <linux/uaccess.h> |
a606b6e8 | 28 | #include <linux/vmalloc.h> |
c88f762e | 29 | #include <linux/dmi.h> |
3c997079 | 30 | |
a7008254 | 31 | #include <wrapper/uuid.h> |
263b6c88 | 32 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
33 | #include <wrapper/random.h> |
34 | #include <wrapper/tracepoint.h> | |
35 | #include <wrapper/list.h> | |
cbc19040 | 36 | #include <wrapper/types.h> |
2df37e95 MD |
37 | #include <lttng/kernel-version.h> |
38 | #include <lttng/events.h> | |
0b365677 | 39 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 40 | #include <lttng/tracer.h> |
21f58fb7 | 41 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
42 | #include <lttng/abi-old.h> |
43 | #include <lttng/endian.h> | |
44 | #include <lttng/string-utils.h> | |
4a11ef1c | 45 | #include <lttng/utils.h> |
24591303 MD |
46 | #include <ringbuffer/backend.h> |
47 | #include <ringbuffer/frontend.h> | |
3636085f | 48 | #include <wrapper/time.h> |
4e3c1b9b | 49 | |
d83004aa JD |
50 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
51 | ||
4e3c1b9b | 52 | static LIST_HEAD(sessions); |
750b05f2 | 53 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 54 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 55 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
56 | /* |
57 | * Protect the sessions and metadata caches. | |
58 | */ | |
4e3c1b9b MD |
59 | static DEFINE_MUTEX(sessions_mutex); |
60 | static struct kmem_cache *event_cache; | |
dffef45d | 61 | static struct kmem_cache *event_notifier_cache; |
4e3c1b9b | 62 | |
b2bc0bc8 FD |
63 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
64 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
65 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
dffef45d | 66 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 67 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 68 | |
a90917c3 | 69 | static void _lttng_event_destroy(struct lttng_event *event); |
dffef45d | 70 | static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier); |
a90917c3 MD |
71 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
72 | static int _lttng_event_unregister(struct lttng_event *event); | |
dffef45d | 73 | static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier); |
c099397a | 74 | static |
a90917c3 MD |
75 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
76 | struct lttng_channel *chan, | |
77 | struct lttng_event *event); | |
c099397a | 78 | static |
a90917c3 | 79 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
80 | static |
81 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 82 | static |
ceabb767 MD |
83 | int _lttng_type_statedump(struct lttng_session *session, |
84 | const struct lttng_type *type, | |
85 | size_t nesting); | |
86 | static | |
f513b2bf MD |
87 | int _lttng_field_statedump(struct lttng_session *session, |
88 | const struct lttng_event_field *field, | |
89 | size_t nesting); | |
c099397a | 90 | |
c099397a | 91 | void synchronize_trace(void) |
abcca994 | 92 | { |
92da05ce MJ |
93 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
94 | synchronize_rcu(); | |
95 | #else | |
abcca994 | 96 | synchronize_sched(); |
92da05ce MJ |
97 | #endif |
98 | ||
b8590f40 MD |
99 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
100 | #ifdef CONFIG_PREEMPT_RT_FULL | |
101 | synchronize_rcu(); | |
102 | #endif | |
103 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
104 | #ifdef CONFIG_PREEMPT_RT |
105 | synchronize_rcu(); | |
106 | #endif | |
b8590f40 | 107 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
108 | } |
109 | ||
3c997079 MD |
110 | void lttng_lock_sessions(void) |
111 | { | |
112 | mutex_lock(&sessions_mutex); | |
113 | } | |
114 | ||
115 | void lttng_unlock_sessions(void) | |
116 | { | |
117 | mutex_unlock(&sessions_mutex); | |
118 | } | |
119 | ||
9fe593d2 FD |
120 | static struct lttng_transport *lttng_transport_find(const char *name) |
121 | { | |
122 | struct lttng_transport *transport; | |
123 | ||
124 | list_for_each_entry(transport, <tng_transport_list, node) { | |
125 | if (!strcmp(transport->name, name)) | |
126 | return transport; | |
127 | } | |
128 | return NULL; | |
129 | } | |
130 | ||
3c997079 MD |
131 | /* |
132 | * Called with sessions lock held. | |
133 | */ | |
134 | int lttng_session_active(void) | |
135 | { | |
136 | struct lttng_session *iter; | |
137 | ||
138 | list_for_each_entry(iter, &sessions, list) { | |
139 | if (iter->active) | |
140 | return 1; | |
141 | } | |
142 | return 0; | |
143 | } | |
144 | ||
a90917c3 | 145 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 146 | { |
a90917c3 | 147 | struct lttng_session *session; |
d83004aa | 148 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 149 | int i; |
4e3c1b9b MD |
150 | |
151 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 152 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 153 | if (!session) |
d83004aa | 154 | goto err; |
4e3c1b9b | 155 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 156 | INIT_LIST_HEAD(&session->events); |
a7008254 | 157 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
158 | |
159 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
160 | GFP_KERNEL); | |
161 | if (!metadata_cache) | |
162 | goto err_free_session; | |
0ca42eb7 | 163 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
164 | if (!metadata_cache->data) |
165 | goto err_free_cache; | |
166 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
167 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 168 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
169 | session->metadata_cache = metadata_cache; |
170 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
171 | memcpy(&metadata_cache->uuid, &session->uuid, |
172 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
173 | INIT_LIST_HEAD(&session->enablers_head); |
174 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
175 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 176 | list_add(&session->list, &sessions); |
d1f652f8 MD |
177 | session->pid_tracker.session = session; |
178 | session->pid_tracker.tracker_type = TRACKER_PID; | |
179 | session->vpid_tracker.session = session; | |
180 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
181 | session->uid_tracker.session = session; | |
182 | session->uid_tracker.tracker_type = TRACKER_UID; | |
183 | session->vuid_tracker.session = session; | |
184 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
185 | session->gid_tracker.session = session; | |
186 | session->gid_tracker.tracker_type = TRACKER_GID; | |
187 | session->vgid_tracker.session = session; | |
188 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
189 | mutex_unlock(&sessions_mutex); |
190 | return session; | |
d83004aa JD |
191 | |
192 | err_free_cache: | |
193 | kfree(metadata_cache); | |
194 | err_free_session: | |
48f5e0b5 | 195 | lttng_kvfree(session); |
d83004aa JD |
196 | err: |
197 | mutex_unlock(&sessions_mutex); | |
198 | return NULL; | |
199 | } | |
200 | ||
750b05f2 FD |
201 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
202 | { | |
203 | struct lttng_transport *transport = NULL; | |
204 | struct lttng_event_notifier_group *event_notifier_group; | |
205 | const char *transport_name = "relay-event-notifier"; | |
206 | size_t subbuf_size = 4096; //TODO | |
207 | size_t num_subbuf = 16; //TODO | |
208 | unsigned int switch_timer_interval = 0; | |
209 | unsigned int read_timer_interval = 0; | |
dffef45d | 210 | int i; |
750b05f2 FD |
211 | |
212 | mutex_lock(&sessions_mutex); | |
213 | ||
214 | transport = lttng_transport_find(transport_name); | |
215 | if (!transport) { | |
216 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
217 | transport_name); | |
218 | goto notransport; | |
219 | } | |
220 | if (!try_module_get(transport->owner)) { | |
221 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
222 | transport_name); | |
223 | goto notransport; | |
224 | } | |
225 | ||
226 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
227 | GFP_KERNEL); | |
228 | if (!event_notifier_group) | |
229 | goto nomem; | |
230 | ||
231 | /* | |
232 | * Initialize the ring buffer used to store event notifier | |
233 | * notifications. | |
234 | */ | |
235 | event_notifier_group->ops = &transport->ops; | |
236 | event_notifier_group->chan = transport->ops.channel_create( | |
237 | transport_name, event_notifier_group, NULL, | |
238 | subbuf_size, num_subbuf, switch_timer_interval, | |
239 | read_timer_interval); | |
240 | if (!event_notifier_group->chan) | |
241 | goto create_error; | |
242 | ||
243 | event_notifier_group->transport = transport; | |
dffef45d FD |
244 | |
245 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
246 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
247 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
248 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
249 | ||
750b05f2 FD |
250 | list_add(&event_notifier_group->node, &event_notifier_groups); |
251 | ||
252 | mutex_unlock(&sessions_mutex); | |
253 | ||
254 | return event_notifier_group; | |
255 | ||
256 | create_error: | |
257 | lttng_kvfree(event_notifier_group); | |
258 | nomem: | |
259 | if (transport) | |
260 | module_put(transport->owner); | |
261 | notransport: | |
262 | mutex_unlock(&sessions_mutex); | |
263 | return NULL; | |
264 | } | |
265 | ||
d83004aa JD |
266 | void metadata_cache_destroy(struct kref *kref) |
267 | { | |
268 | struct lttng_metadata_cache *cache = | |
269 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 270 | vfree(cache->data); |
d83004aa | 271 | kfree(cache); |
4e3c1b9b MD |
272 | } |
273 | ||
a90917c3 | 274 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 275 | { |
a90917c3 MD |
276 | struct lttng_channel *chan, *tmpchan; |
277 | struct lttng_event *event, *tmpevent; | |
d83004aa | 278 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 279 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 280 | int ret; |
4e3c1b9b MD |
281 | |
282 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 283 | WRITE_ONCE(session->active, 0); |
1ec65de1 | 284 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 285 | ret = lttng_syscalls_unregister_event(chan); |
1ec65de1 MD |
286 | WARN_ON(ret); |
287 | } | |
dda6a249 | 288 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 289 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
290 | WARN_ON(ret); |
291 | } | |
abcca994 | 292 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 | 293 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 294 | ret = lttng_syscalls_destroy_event(chan); |
badfe9f5 MD |
295 | WARN_ON(ret); |
296 | } | |
b2bc0bc8 | 297 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 298 | &session->enablers_head, node) |
b2bc0bc8 | 299 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 300 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 301 | _lttng_event_destroy(event); |
d83004aa JD |
302 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
303 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 304 | _lttng_channel_destroy(chan); |
d83004aa | 305 | } |
ab036a63 | 306 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
307 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
308 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 309 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
310 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
311 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
312 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
313 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
314 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
315 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 316 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
317 | list_del(&session->list); |
318 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 319 | lttng_kvfree(session); |
4e3c1b9b MD |
320 | } |
321 | ||
dffef45d FD |
322 | void lttng_event_notifier_group_destroy( |
323 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 324 | { |
dffef45d FD |
325 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
326 | struct lttng_event_notifier *event_notifier, *tmpevent_notifier; | |
327 | int ret; | |
328 | ||
750b05f2 FD |
329 | if (!event_notifier_group) |
330 | return; | |
331 | ||
332 | mutex_lock(&sessions_mutex); | |
dffef45d | 333 | |
8a8ac9a8 FD |
334 | ret = lttng_syscalls_unregister_event_notifier(event_notifier_group); |
335 | WARN_ON(ret); | |
336 | ||
dffef45d FD |
337 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, |
338 | &event_notifier_group->event_notifiers_head, list) { | |
339 | ret = _lttng_event_notifier_unregister(event_notifier); | |
340 | WARN_ON(ret); | |
341 | } | |
342 | ||
b01155ba FD |
343 | /* Wait for in-flight event notifier to complete */ |
344 | synchronize_trace(); | |
345 | ||
21f58fb7 FD |
346 | irq_work_sync(&event_notifier_group->wakeup_pending); |
347 | ||
8a8ac9a8 FD |
348 | kfree(event_notifier_group->sc_filter); |
349 | ||
dffef45d FD |
350 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
351 | &event_notifier_group->enablers_head, node) | |
352 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
353 | ||
354 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
355 | &event_notifier_group->event_notifiers_head, list) | |
356 | _lttng_event_notifier_destroy(event_notifier); | |
357 | ||
750b05f2 FD |
358 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
359 | module_put(event_notifier_group->transport->owner); | |
360 | list_del(&event_notifier_group->node); | |
dffef45d | 361 | |
750b05f2 FD |
362 | mutex_unlock(&sessions_mutex); |
363 | lttng_kvfree(event_notifier_group); | |
364 | } | |
365 | ||
601252cf MD |
366 | int lttng_session_statedump(struct lttng_session *session) |
367 | { | |
368 | int ret; | |
369 | ||
370 | mutex_lock(&sessions_mutex); | |
371 | ret = lttng_statedump_start(session); | |
372 | mutex_unlock(&sessions_mutex); | |
373 | return ret; | |
374 | } | |
375 | ||
a90917c3 | 376 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
377 | { |
378 | int ret = 0; | |
a90917c3 | 379 | struct lttng_channel *chan; |
c0e31d2e MD |
380 | |
381 | mutex_lock(&sessions_mutex); | |
382 | if (session->active) { | |
383 | ret = -EBUSY; | |
384 | goto end; | |
385 | } | |
c099397a | 386 | |
3c997079 MD |
387 | /* Set transient enabler state to "enabled" */ |
388 | session->tstate = 1; | |
389 | ||
4ef81e4a | 390 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 391 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 392 | |
c099397a MD |
393 | /* |
394 | * Snapshot the number of events per channel to know the type of header | |
395 | * we need to use. | |
396 | */ | |
397 | list_for_each_entry(chan, &session->chan, list) { | |
398 | if (chan->header_type) | |
399 | continue; /* don't change it if session stop/restart */ | |
400 | if (chan->free_event_id < 31) | |
401 | chan->header_type = 1; /* compact */ | |
402 | else | |
403 | chan->header_type = 2; /* large */ | |
404 | } | |
405 | ||
64af2437 | 406 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
407 | list_for_each_entry(chan, &session->chan, list) { |
408 | if (chan->channel_type != METADATA_CHANNEL) | |
409 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
410 | } | |
64af2437 | 411 | |
a8f2d0c7 MJ |
412 | WRITE_ONCE(session->active, 1); |
413 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 414 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 415 | if (ret) { |
a8f2d0c7 | 416 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
417 | goto end; |
418 | } | |
419 | ret = lttng_statedump_start(session); | |
360f38ea | 420 | if (ret) |
a8f2d0c7 | 421 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
422 | end: |
423 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 424 | return ret; |
c0e31d2e MD |
425 | } |
426 | ||
a90917c3 | 427 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
428 | { |
429 | int ret = 0; | |
64af2437 | 430 | struct lttng_channel *chan; |
c0e31d2e MD |
431 | |
432 | mutex_lock(&sessions_mutex); | |
433 | if (!session->active) { | |
434 | ret = -EBUSY; | |
435 | goto end; | |
436 | } | |
a8f2d0c7 | 437 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
438 | |
439 | /* Set transient enabler state to "disabled" */ | |
440 | session->tstate = 0; | |
b2bc0bc8 | 441 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
442 | |
443 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
444 | list_for_each_entry(chan, &session->chan, list) { |
445 | if (chan->channel_type != METADATA_CHANNEL) | |
446 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
447 | } | |
c0e31d2e MD |
448 | end: |
449 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 450 | return ret; |
c0e31d2e MD |
451 | } |
452 | ||
9616f0bf JD |
453 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
454 | { | |
455 | int ret = 0; | |
456 | struct lttng_channel *chan; | |
457 | struct lttng_event *event; | |
458 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
459 | struct lttng_metadata_stream *stream; | |
460 | ||
461 | mutex_lock(&sessions_mutex); | |
462 | if (!session->active) { | |
463 | ret = -EBUSY; | |
464 | goto end; | |
465 | } | |
466 | ||
467 | mutex_lock(&cache->lock); | |
468 | memset(cache->data, 0, cache->cache_alloc); | |
469 | cache->metadata_written = 0; | |
470 | cache->version++; | |
471 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
472 | stream->metadata_out = 0; | |
473 | stream->metadata_in = 0; | |
474 | } | |
475 | mutex_unlock(&cache->lock); | |
476 | ||
477 | session->metadata_dumped = 0; | |
478 | list_for_each_entry(chan, &session->chan, list) { | |
479 | chan->metadata_dumped = 0; | |
480 | } | |
481 | ||
482 | list_for_each_entry(event, &session->events, list) { | |
483 | event->metadata_dumped = 0; | |
484 | } | |
485 | ||
486 | ret = _lttng_session_metadata_statedump(session); | |
487 | ||
488 | end: | |
489 | mutex_unlock(&sessions_mutex); | |
490 | return ret; | |
491 | } | |
492 | ||
a90917c3 | 493 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 494 | { |
3c997079 | 495 | int ret = 0; |
e64957da | 496 | |
3c997079 MD |
497 | mutex_lock(&sessions_mutex); |
498 | if (channel->channel_type == METADATA_CHANNEL) { | |
499 | ret = -EPERM; | |
500 | goto end; | |
501 | } | |
502 | if (channel->enabled) { | |
503 | ret = -EEXIST; | |
504 | goto end; | |
505 | } | |
506 | /* Set transient enabler state to "enabled" */ | |
507 | channel->tstate = 1; | |
b2bc0bc8 | 508 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 509 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 510 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
511 | end: |
512 | mutex_unlock(&sessions_mutex); | |
513 | return ret; | |
e64957da MD |
514 | } |
515 | ||
a90917c3 | 516 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 517 | { |
3c997079 | 518 | int ret = 0; |
e64957da | 519 | |
3c997079 MD |
520 | mutex_lock(&sessions_mutex); |
521 | if (channel->channel_type == METADATA_CHANNEL) { | |
522 | ret = -EPERM; | |
523 | goto end; | |
524 | } | |
525 | if (!channel->enabled) { | |
526 | ret = -EEXIST; | |
527 | goto end; | |
528 | } | |
529 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 530 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
531 | /* Set transient enabler state to "enabled" */ |
532 | channel->tstate = 0; | |
b2bc0bc8 | 533 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
534 | end: |
535 | mutex_unlock(&sessions_mutex); | |
536 | return ret; | |
e64957da MD |
537 | } |
538 | ||
a90917c3 | 539 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 540 | { |
3c997079 | 541 | int ret = 0; |
e64957da | 542 | |
3c997079 MD |
543 | mutex_lock(&sessions_mutex); |
544 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
545 | ret = -EPERM; | |
546 | goto end; | |
547 | } | |
548 | if (event->enabled) { | |
549 | ret = -EEXIST; | |
550 | goto end; | |
551 | } | |
a0493bef MD |
552 | switch (event->instrumentation) { |
553 | case LTTNG_KERNEL_TRACEPOINT: | |
554 | case LTTNG_KERNEL_SYSCALL: | |
555 | ret = -EINVAL; | |
556 | break; | |
557 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 558 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 559 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 560 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
561 | break; |
562 | case LTTNG_KERNEL_KRETPROBE: | |
563 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
564 | break; | |
e884017c | 565 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
566 | default: |
567 | WARN_ON_ONCE(1); | |
568 | ret = -EINVAL; | |
569 | } | |
3c997079 MD |
570 | end: |
571 | mutex_unlock(&sessions_mutex); | |
572 | return ret; | |
e64957da MD |
573 | } |
574 | ||
a90917c3 | 575 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 576 | { |
3c997079 | 577 | int ret = 0; |
e64957da | 578 | |
3c997079 MD |
579 | mutex_lock(&sessions_mutex); |
580 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
581 | ret = -EPERM; | |
582 | goto end; | |
583 | } | |
584 | if (!event->enabled) { | |
585 | ret = -EEXIST; | |
586 | goto end; | |
587 | } | |
a0493bef MD |
588 | switch (event->instrumentation) { |
589 | case LTTNG_KERNEL_TRACEPOINT: | |
590 | case LTTNG_KERNEL_SYSCALL: | |
591 | ret = -EINVAL; | |
592 | break; | |
593 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 594 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 595 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 596 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
597 | break; |
598 | case LTTNG_KERNEL_KRETPROBE: | |
599 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
600 | break; | |
e884017c | 601 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
602 | default: |
603 | WARN_ON_ONCE(1); | |
604 | ret = -EINVAL; | |
605 | } | |
3c997079 MD |
606 | end: |
607 | mutex_unlock(&sessions_mutex); | |
608 | return ret; | |
e64957da MD |
609 | } |
610 | ||
dffef45d FD |
611 | int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier) |
612 | { | |
613 | int ret = 0; | |
614 | ||
615 | mutex_lock(&sessions_mutex); | |
616 | if (event_notifier->enabled) { | |
617 | ret = -EEXIST; | |
618 | goto end; | |
619 | } | |
620 | switch (event_notifier->instrumentation) { | |
621 | case LTTNG_KERNEL_TRACEPOINT: | |
8a8ac9a8 | 622 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
623 | ret = -EINVAL; |
624 | break; | |
dffef45d | 625 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 626 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
627 | WRITE_ONCE(event_notifier->enabled, 1); |
628 | break; | |
dffef45d | 629 | case LTTNG_KERNEL_FUNCTION: |
dffef45d FD |
630 | case LTTNG_KERNEL_NOOP: |
631 | case LTTNG_KERNEL_KRETPROBE: | |
632 | default: | |
633 | WARN_ON_ONCE(1); | |
634 | ret = -EINVAL; | |
635 | } | |
636 | end: | |
637 | mutex_unlock(&sessions_mutex); | |
638 | return ret; | |
639 | } | |
640 | ||
641 | int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier) | |
642 | { | |
643 | int ret = 0; | |
644 | ||
645 | mutex_lock(&sessions_mutex); | |
646 | if (!event_notifier->enabled) { | |
647 | ret = -EEXIST; | |
648 | goto end; | |
649 | } | |
650 | switch (event_notifier->instrumentation) { | |
651 | case LTTNG_KERNEL_TRACEPOINT: | |
8a8ac9a8 | 652 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
653 | ret = -EINVAL; |
654 | break; | |
dffef45d | 655 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 656 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
657 | WRITE_ONCE(event_notifier->enabled, 0); |
658 | break; | |
dffef45d | 659 | case LTTNG_KERNEL_FUNCTION: |
dffef45d FD |
660 | case LTTNG_KERNEL_NOOP: |
661 | case LTTNG_KERNEL_KRETPROBE: | |
662 | default: | |
663 | WARN_ON_ONCE(1); | |
664 | ret = -EINVAL; | |
665 | } | |
666 | end: | |
667 | mutex_unlock(&sessions_mutex); | |
668 | return ret; | |
669 | } | |
670 | ||
a90917c3 | 671 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
672 | const char *transport_name, |
673 | void *buf_addr, | |
4e3c1b9b MD |
674 | size_t subbuf_size, size_t num_subbuf, |
675 | unsigned int switch_timer_interval, | |
d83004aa JD |
676 | unsigned int read_timer_interval, |
677 | enum channel_type channel_type) | |
4e3c1b9b | 678 | { |
a90917c3 MD |
679 | struct lttng_channel *chan; |
680 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
681 | |
682 | mutex_lock(&sessions_mutex); | |
d83004aa | 683 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 684 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 685 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 686 | if (!transport) { |
5a15f70c | 687 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 688 | transport_name); |
c0e31d2e | 689 | goto notransport; |
f3d01b96 | 690 | } |
a33c9927 | 691 | if (!try_module_get(transport->owner)) { |
5a15f70c | 692 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
693 | goto notransport; |
694 | } | |
a90917c3 | 695 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 696 | if (!chan) |
c0e31d2e | 697 | goto nomem; |
4e3c1b9b | 698 | chan->session = session; |
05d32c64 | 699 | chan->id = session->free_chan_id++; |
3b731ab1 | 700 | chan->ops = &transport->ops; |
125b4df4 MD |
701 | /* |
702 | * Note: the channel creation op already writes into the packet | |
703 | * headers. Therefore the "chan" information used as input | |
704 | * should be already accessible. | |
705 | */ | |
5f5ddf01 MD |
706 | chan->chan = transport->ops.channel_create(transport_name, |
707 | chan, buf_addr, subbuf_size, num_subbuf, | |
708 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
709 | if (!chan->chan) |
710 | goto create_error; | |
3c997079 | 711 | chan->tstate = 1; |
e64957da | 712 | chan->enabled = 1; |
a33c9927 | 713 | chan->transport = transport; |
d83004aa | 714 | chan->channel_type = channel_type; |
4e3c1b9b MD |
715 | list_add(&chan->list, &session->chan); |
716 | mutex_unlock(&sessions_mutex); | |
717 | return chan; | |
718 | ||
f3d01b96 MD |
719 | create_error: |
720 | kfree(chan); | |
c0e31d2e | 721 | nomem: |
a33c9927 MD |
722 | if (transport) |
723 | module_put(transport->owner); | |
c0e31d2e | 724 | notransport: |
e5382b6d | 725 | active: |
4e3c1b9b MD |
726 | mutex_unlock(&sessions_mutex); |
727 | return NULL; | |
728 | } | |
729 | ||
730 | /* | |
d83004aa JD |
731 | * Only used internally at session destruction for per-cpu channels, and |
732 | * when metadata channel is released. | |
733 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 734 | */ |
aa7c23a9 | 735 | static |
a90917c3 | 736 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 737 | { |
11b5a3c2 | 738 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 739 | module_put(chan->transport->owner); |
4e3c1b9b | 740 | list_del(&chan->list); |
8070f5c0 | 741 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
742 | kfree(chan); |
743 | } | |
744 | ||
d83004aa JD |
745 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
746 | { | |
747 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
748 | ||
749 | /* Protect the metadata cache with the sessions_mutex. */ | |
750 | mutex_lock(&sessions_mutex); | |
751 | _lttng_channel_destroy(chan); | |
752 | mutex_unlock(&sessions_mutex); | |
753 | } | |
754 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
755 | ||
756 | static | |
757 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
758 | { | |
759 | stream->finalized = 1; | |
760 | wake_up_interruptible(&stream->read_wait); | |
761 | } | |
762 | ||
a101fa10 MD |
763 | static |
764 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
765 | { | |
766 | struct lttng_counter_transport *transport; | |
767 | ||
768 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
769 | if (!strcmp(transport->name, name)) | |
770 | return transport; | |
771 | } | |
772 | return NULL; | |
773 | } | |
774 | ||
e5382b6d MD |
775 | /* |
776 | * Supports event creation while tracing session is active. | |
3c997079 | 777 | * Needs to be called with sessions mutex held. |
e5382b6d | 778 | */ |
3c997079 MD |
779 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
780 | struct lttng_kernel_event *event_param, | |
781 | void *filter, | |
782 | const struct lttng_event_desc *event_desc, | |
783 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 784 | { |
3c997079 | 785 | struct lttng_session *session = chan->session; |
a90917c3 | 786 | struct lttng_event *event; |
3c997079 MD |
787 | const char *event_name; |
788 | struct hlist_head *head; | |
3d084699 | 789 | int ret; |
4e3c1b9b | 790 | |
abc0446a | 791 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 792 | ret = -EMFILE; |
e5382b6d | 793 | goto full; |
abc0446a | 794 | } |
3c997079 MD |
795 | |
796 | switch (itype) { | |
797 | case LTTNG_KERNEL_TRACEPOINT: | |
798 | event_name = event_desc->name; | |
799 | break; | |
800 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 801 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 802 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 803 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 804 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
805 | event_name = event_param->name; |
806 | break; | |
e884017c | 807 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
808 | default: |
809 | WARN_ON_ONCE(1); | |
810 | ret = -EINVAL; | |
811 | goto type_error; | |
812 | } | |
4a11ef1c FD |
813 | |
814 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
815 | LTTNG_EVENT_HT_SIZE, event_name); | |
d216ecae | 816 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
817 | WARN_ON_ONCE(!event->desc); |
818 | if (!strncmp(event->desc->name, event_name, | |
819 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
820 | && chan == event->chan) { | |
821 | ret = -EEXIST; | |
822 | goto exist; | |
abc0446a MD |
823 | } |
824 | } | |
3c997079 | 825 | |
11b5a3c2 | 826 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 827 | if (!event) { |
4cf0bf51 | 828 | ret = -ENOMEM; |
4e3c1b9b | 829 | goto cache_error; |
abc0446a | 830 | } |
4e3c1b9b MD |
831 | event->chan = chan; |
832 | event->filter = filter; | |
e5382b6d | 833 | event->id = chan->free_event_id++; |
3c997079 MD |
834 | event->instrumentation = itype; |
835 | event->evtype = LTTNG_TYPE_EVENT; | |
183e8b3a | 836 | INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
3c997079 MD |
837 | INIT_LIST_HEAD(&event->enablers_ref_head); |
838 | ||
839 | switch (itype) { | |
ab2277d6 | 840 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
841 | /* Event will be enabled by enabler sync. */ |
842 | event->enabled = 0; | |
843 | event->registered = 0; | |
0bcedee9 | 844 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 845 | if (!event->desc) { |
4cf0bf51 | 846 | ret = -ENOENT; |
d3dbe23c | 847 | goto register_error; |
abc0446a | 848 | } |
3c997079 MD |
849 | /* Populate lttng_event structure before event registration. */ |
850 | smp_wmb(); | |
baf20995 | 851 | break; |
ab2277d6 | 852 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
853 | /* |
854 | * Needs to be explicitly enabled after creation, since | |
855 | * we may want to apply filters. | |
856 | */ | |
857 | event->enabled = 0; | |
3c997079 MD |
858 | event->registered = 1; |
859 | /* | |
860 | * Populate lttng_event structure before event | |
861 | * registration. | |
862 | */ | |
863 | smp_wmb(); | |
8bf17deb | 864 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
865 | event_param->u.kprobe.symbol_name, |
866 | event_param->u.kprobe.offset, | |
867 | event_param->u.kprobe.addr, | |
868 | event); | |
abc0446a | 869 | if (ret) { |
4cf0bf51 | 870 | ret = -EINVAL; |
d6d808f3 | 871 | goto register_error; |
abc0446a | 872 | } |
edeb3137 MD |
873 | ret = try_module_get(event->desc->owner); |
874 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 875 | break; |
7371f44c MD |
876 | case LTTNG_KERNEL_KRETPROBE: |
877 | { | |
a90917c3 | 878 | struct lttng_event *event_return; |
7371f44c MD |
879 | |
880 | /* kretprobe defines 2 events */ | |
a0493bef MD |
881 | /* |
882 | * Needs to be explicitly enabled after creation, since | |
883 | * we may want to apply filters. | |
884 | */ | |
885 | event->enabled = 0; | |
3c997079 | 886 | event->registered = 1; |
7371f44c MD |
887 | event_return = |
888 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 889 | if (!event_return) { |
4cf0bf51 | 890 | ret = -ENOMEM; |
7371f44c | 891 | goto register_error; |
abc0446a | 892 | } |
7371f44c MD |
893 | event_return->chan = chan; |
894 | event_return->filter = filter; | |
895 | event_return->id = chan->free_event_id++; | |
a0493bef | 896 | event_return->enabled = 0; |
3c997079 MD |
897 | event_return->registered = 1; |
898 | event_return->instrumentation = itype; | |
7371f44c | 899 | /* |
a90917c3 | 900 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
901 | */ |
902 | smp_wmb(); | |
3c997079 | 903 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
904 | event_param->u.kretprobe.symbol_name, |
905 | event_param->u.kretprobe.offset, | |
906 | event_param->u.kretprobe.addr, | |
907 | event, event_return); | |
908 | if (ret) { | |
909 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 910 | ret = -EINVAL; |
7371f44c MD |
911 | goto register_error; |
912 | } | |
913 | /* Take 2 refs on the module: one per event. */ | |
914 | ret = try_module_get(event->desc->owner); | |
915 | WARN_ON_ONCE(!ret); | |
916 | ret = try_module_get(event->desc->owner); | |
917 | WARN_ON_ONCE(!ret); | |
a90917c3 | 918 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 919 | event_return); |
abc0446a | 920 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
921 | if (ret) { |
922 | kmem_cache_free(event_cache, event_return); | |
923 | module_put(event->desc->owner); | |
924 | module_put(event->desc->owner); | |
925 | goto statedump_error; | |
926 | } | |
927 | list_add(&event_return->list, &chan->session->events); | |
928 | break; | |
929 | } | |
1ec65de1 | 930 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 931 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
932 | /* |
933 | * Needs to be explicitly enabled after creation, since | |
934 | * we may want to apply filters. | |
935 | */ | |
936 | event->enabled = 0; | |
3c997079 MD |
937 | event->registered = 0; |
938 | event->desc = event_desc; | |
badfe9f5 MD |
939 | switch (event_param->u.syscall.entryexit) { |
940 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
941 | ret = -EINVAL; | |
942 | goto register_error; | |
943 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
944 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
945 | break; | |
946 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
947 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
948 | break; | |
949 | } | |
950 | switch (event_param->u.syscall.abi) { | |
951 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
952 | ret = -EINVAL; | |
953 | goto register_error; | |
954 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
955 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
956 | break; | |
957 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
958 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
959 | break; | |
960 | } | |
abc0446a | 961 | if (!event->desc) { |
4cf0bf51 | 962 | ret = -EINVAL; |
259b6cb3 | 963 | goto register_error; |
abc0446a | 964 | } |
1ec65de1 | 965 | break; |
149b9a9d | 966 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
967 | /* |
968 | * Needs to be explicitly enabled after creation, since | |
969 | * we may want to apply filters. | |
970 | */ | |
971 | event->enabled = 0; | |
972 | event->registered = 1; | |
3aed4dca | 973 | |
a344f64b FD |
974 | /* |
975 | * Populate lttng_event structure before event | |
976 | * registration. | |
977 | */ | |
978 | smp_wmb(); | |
149b9a9d | 979 | |
83b802dc | 980 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 981 | event_param->u.uprobe.fd, |
149b9a9d YB |
982 | event); |
983 | if (ret) | |
984 | goto register_error; | |
985 | ret = try_module_get(event->desc->owner); | |
986 | WARN_ON_ONCE(!ret); | |
987 | break; | |
e884017c | 988 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
989 | default: |
990 | WARN_ON_ONCE(1); | |
4cf0bf51 | 991 | ret = -EINVAL; |
df07930b | 992 | goto register_error; |
baf20995 | 993 | } |
a90917c3 | 994 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
995 | WARN_ON_ONCE(ret > 0); |
996 | if (ret) { | |
c099397a | 997 | goto statedump_error; |
abc0446a | 998 | } |
3c997079 | 999 | hlist_add_head(&event->hlist, head); |
dda6a249 | 1000 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
1001 | return event; |
1002 | ||
c099397a | 1003 | statedump_error: |
259b6cb3 | 1004 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1005 | register_error: |
11b5a3c2 | 1006 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1007 | cache_error: |
1008 | exist: | |
3c997079 | 1009 | type_error: |
e5382b6d | 1010 | full: |
4cf0bf51 | 1011 | return ERR_PTR(ret); |
4e3c1b9b MD |
1012 | } |
1013 | ||
dffef45d FD |
1014 | struct lttng_event_notifier *_lttng_event_notifier_create( |
1015 | const struct lttng_event_desc *event_desc, | |
1016 | uint64_t token, struct lttng_event_notifier_group *event_notifier_group, | |
1017 | struct lttng_kernel_event_notifier *event_notifier_param, | |
1018 | void *filter, enum lttng_kernel_instrumentation itype) | |
1019 | { | |
1020 | struct lttng_event_notifier *event_notifier; | |
1021 | const char *event_name; | |
1022 | struct hlist_head *head; | |
1023 | int ret; | |
1024 | ||
1025 | switch (itype) { | |
1026 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1027 | event_name = event_desc->name; |
1028 | break; | |
dffef45d | 1029 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 1030 | case LTTNG_KERNEL_UPROBE: |
8a8ac9a8 | 1031 | case LTTNG_KERNEL_SYSCALL: |
2b16f0c9 FD |
1032 | event_name = event_notifier_param->event.name; |
1033 | break; | |
dffef45d FD |
1034 | case LTTNG_KERNEL_KRETPROBE: |
1035 | case LTTNG_KERNEL_FUNCTION: | |
1036 | case LTTNG_KERNEL_NOOP: | |
dffef45d FD |
1037 | default: |
1038 | WARN_ON_ONCE(1); | |
1039 | ret = -EINVAL; | |
1040 | goto type_error; | |
1041 | } | |
1042 | ||
1043 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1044 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
1045 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1046 | WARN_ON_ONCE(!event_notifier->desc); | |
1047 | if (!strncmp(event_notifier->desc->name, event_name, | |
1048 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
1049 | && event_notifier_group == event_notifier->group | |
1050 | && token == event_notifier->user_token) { | |
1051 | ret = -EEXIST; | |
1052 | goto exist; | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1057 | if (!event_notifier) { | |
1058 | ret = -ENOMEM; | |
1059 | goto cache_error; | |
1060 | } | |
21f58fb7 | 1061 | |
dffef45d FD |
1062 | event_notifier->group = event_notifier_group; |
1063 | event_notifier->user_token = token; | |
99d223ad | 1064 | event_notifier->num_captures = 0; |
dffef45d FD |
1065 | event_notifier->filter = filter; |
1066 | event_notifier->instrumentation = itype; | |
1067 | event_notifier->evtype = LTTNG_TYPE_EVENT; | |
21f58fb7 | 1068 | event_notifier->send_notification = lttng_event_notifier_notification_send; |
183e8b3a | 1069 | INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); |
99d223ad | 1070 | INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
dffef45d FD |
1071 | INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
1072 | ||
1073 | switch (itype) { | |
1074 | case LTTNG_KERNEL_TRACEPOINT: | |
1075 | /* Event will be enabled by enabler sync. */ | |
1076 | event_notifier->enabled = 0; | |
1077 | event_notifier->registered = 0; | |
1078 | event_notifier->desc = lttng_event_desc_get(event_name); | |
1079 | if (!event_notifier->desc) { | |
1080 | ret = -ENOENT; | |
1081 | goto register_error; | |
1082 | } | |
1083 | /* Populate lttng_event_notifier structure before event registration. */ | |
1084 | smp_wmb(); | |
1085 | break; | |
1086 | case LTTNG_KERNEL_KPROBE: | |
2b16f0c9 FD |
1087 | /* |
1088 | * Needs to be explicitly enabled after creation, since | |
1089 | * we may want to apply filters. | |
1090 | */ | |
1091 | event_notifier->enabled = 0; | |
1092 | event_notifier->registered = 1; | |
1093 | /* | |
1094 | * Populate lttng_event_notifier structure before event | |
1095 | * registration. | |
1096 | */ | |
1097 | smp_wmb(); | |
1098 | ret = lttng_kprobes_register_event_notifier( | |
1099 | event_notifier_param->event.u.kprobe.symbol_name, | |
1100 | event_notifier_param->event.u.kprobe.offset, | |
1101 | event_notifier_param->event.u.kprobe.addr, | |
1102 | event_notifier); | |
1103 | if (ret) { | |
1104 | ret = -EINVAL; | |
1105 | goto register_error; | |
1106 | } | |
1107 | ret = try_module_get(event_notifier->desc->owner); | |
1108 | WARN_ON_ONCE(!ret); | |
1109 | break; | |
8a8ac9a8 FD |
1110 | case LTTNG_KERNEL_NOOP: |
1111 | case LTTNG_KERNEL_SYSCALL: | |
1112 | /* | |
1113 | * Needs to be explicitly enabled after creation, since | |
1114 | * we may want to apply filters. | |
1115 | */ | |
1116 | event_notifier->enabled = 0; | |
1117 | event_notifier->registered = 0; | |
1118 | event_notifier->desc = event_desc; | |
1119 | switch (event_notifier_param->event.u.syscall.entryexit) { | |
1120 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1121 | ret = -EINVAL; | |
1122 | goto register_error; | |
1123 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1124 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
1125 | break; | |
1126 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1127 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1128 | break; | |
1129 | } | |
1130 | switch (event_notifier_param->event.u.syscall.abi) { | |
1131 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1132 | ret = -EINVAL; | |
1133 | goto register_error; | |
1134 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1135 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1136 | break; | |
1137 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1138 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1139 | break; | |
1140 | } | |
1141 | ||
1142 | if (!event_notifier->desc) { | |
1143 | ret = -EINVAL; | |
1144 | goto register_error; | |
1145 | } | |
1146 | break; | |
dffef45d | 1147 | case LTTNG_KERNEL_UPROBE: |
9de67196 FD |
1148 | /* |
1149 | * Needs to be explicitly enabled after creation, since | |
1150 | * we may want to apply filters. | |
1151 | */ | |
1152 | event_notifier->enabled = 0; | |
1153 | event_notifier->registered = 1; | |
1154 | ||
1155 | /* | |
1156 | * Populate lttng_event_notifier structure before | |
1157 | * event_notifier registration. | |
1158 | */ | |
1159 | smp_wmb(); | |
1160 | ||
1161 | ret = lttng_uprobes_register_event_notifier( | |
1162 | event_notifier_param->event.name, | |
1163 | event_notifier_param->event.u.uprobe.fd, | |
1164 | event_notifier); | |
1165 | if (ret) | |
1166 | goto register_error; | |
1167 | ret = try_module_get(event_notifier->desc->owner); | |
1168 | WARN_ON_ONCE(!ret); | |
1169 | break; | |
dffef45d FD |
1170 | case LTTNG_KERNEL_KRETPROBE: |
1171 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
1172 | default: |
1173 | WARN_ON_ONCE(1); | |
1174 | ret = -EINVAL; | |
1175 | goto register_error; | |
1176 | } | |
1177 | ||
1178 | list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head); | |
1179 | hlist_add_head(&event_notifier->hlist, head); | |
1180 | return event_notifier; | |
1181 | ||
1182 | register_error: | |
1183 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1184 | cache_error: | |
1185 | exist: | |
1186 | type_error: | |
1187 | return ERR_PTR(ret); | |
1188 | } | |
1189 | ||
3c997079 MD |
1190 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
1191 | struct lttng_kernel_event *event_param, | |
1192 | void *filter, | |
1193 | const struct lttng_event_desc *event_desc, | |
1194 | enum lttng_kernel_instrumentation itype) | |
1195 | { | |
1196 | struct lttng_event *event; | |
1197 | ||
1198 | mutex_lock(&sessions_mutex); | |
1199 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
1200 | itype); | |
1201 | mutex_unlock(&sessions_mutex); | |
1202 | return event; | |
1203 | } | |
1204 | ||
dffef45d FD |
1205 | struct lttng_event_notifier *lttng_event_notifier_create( |
1206 | const struct lttng_event_desc *event_desc, | |
1207 | uint64_t id, struct lttng_event_notifier_group *event_notifier_group, | |
1208 | struct lttng_kernel_event_notifier *event_notifier_param, | |
1209 | void *filter, enum lttng_kernel_instrumentation itype) | |
1210 | { | |
1211 | struct lttng_event_notifier *event_notifier; | |
1212 | ||
1213 | mutex_lock(&sessions_mutex); | |
1214 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
1215 | event_notifier_group, event_notifier_param, filter, itype); | |
1216 | mutex_unlock(&sessions_mutex); | |
1217 | return event_notifier; | |
1218 | } | |
1219 | ||
3c997079 MD |
1220 | /* Only used for tracepoints for now. */ |
1221 | static | |
1222 | void register_event(struct lttng_event *event) | |
1223 | { | |
1224 | const struct lttng_event_desc *desc; | |
f127e61e | 1225 | int ret = -EINVAL; |
3c997079 | 1226 | |
3c997079 MD |
1227 | if (event->registered) |
1228 | return; | |
4ecb5ad5 | 1229 | |
3c997079 | 1230 | desc = event->desc; |
4ecb5ad5 MD |
1231 | switch (event->instrumentation) { |
1232 | case LTTNG_KERNEL_TRACEPOINT: | |
1233 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
1234 | desc->probe_callback, | |
1235 | event); | |
1236 | break; | |
1237 | case LTTNG_KERNEL_SYSCALL: | |
2d6d88c6 | 1238 | ret = lttng_syscall_filter_enable_event(event->chan, event); |
4ecb5ad5 MD |
1239 | break; |
1240 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 1241 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 1242 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
1243 | case LTTNG_KERNEL_NOOP: |
1244 | ret = 0; | |
1245 | break; | |
e884017c | 1246 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
1247 | default: |
1248 | WARN_ON_ONCE(1); | |
1249 | } | |
3c997079 MD |
1250 | if (!ret) |
1251 | event->registered = 1; | |
1252 | } | |
1253 | ||
4e3c1b9b MD |
1254 | /* |
1255 | * Only used internally at session destruction. | |
1256 | */ | |
a90917c3 | 1257 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 1258 | { |
4ecb5ad5 | 1259 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
1260 | int ret = -EINVAL; |
1261 | ||
3c997079 MD |
1262 | if (!event->registered) |
1263 | return 0; | |
1264 | ||
4ecb5ad5 | 1265 | desc = event->desc; |
38d024ae | 1266 | switch (event->instrumentation) { |
ab2277d6 | 1267 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 1268 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 1269 | event->desc->probe_callback, |
11b5a3c2 | 1270 | event); |
baf20995 | 1271 | break; |
ab2277d6 | 1272 | case LTTNG_KERNEL_KPROBE: |
8bf17deb | 1273 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1274 | ret = 0; |
1275 | break; | |
7371f44c MD |
1276 | case LTTNG_KERNEL_KRETPROBE: |
1277 | lttng_kretprobes_unregister(event); | |
1278 | ret = 0; | |
1279 | break; | |
33a39a3c | 1280 | case LTTNG_KERNEL_SYSCALL: |
2d6d88c6 | 1281 | ret = lttng_syscall_filter_disable_event(event->chan, event); |
4ecb5ad5 MD |
1282 | break; |
1283 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
1284 | ret = 0; |
1285 | break; | |
149b9a9d | 1286 | case LTTNG_KERNEL_UPROBE: |
83b802dc | 1287 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1288 | ret = 0; |
1289 | break; | |
e884017c | 1290 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1291 | default: |
1292 | WARN_ON_ONCE(1); | |
1293 | } | |
3c997079 MD |
1294 | if (!ret) |
1295 | event->registered = 0; | |
dda6a249 MD |
1296 | return ret; |
1297 | } | |
1298 | ||
dffef45d FD |
1299 | /* Only used for tracepoints for now. */ |
1300 | static | |
b01155ba | 1301 | void register_event_notifier(struct lttng_event_notifier *event_notifier) |
dffef45d FD |
1302 | { |
1303 | const struct lttng_event_desc *desc; | |
1304 | int ret = -EINVAL; | |
1305 | ||
1306 | if (event_notifier->registered) | |
1307 | return; | |
1308 | ||
1309 | desc = event_notifier->desc; | |
1310 | switch (event_notifier->instrumentation) { | |
1311 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1312 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, |
1313 | desc->event_notifier_callback, | |
1314 | event_notifier); | |
1315 | break; | |
8a8ac9a8 FD |
1316 | case LTTNG_KERNEL_SYSCALL: |
1317 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); | |
1318 | break; | |
dffef45d | 1319 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 1320 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
1321 | ret = 0; |
1322 | break; | |
dffef45d FD |
1323 | case LTTNG_KERNEL_KRETPROBE: |
1324 | case LTTNG_KERNEL_FUNCTION: | |
1325 | case LTTNG_KERNEL_NOOP: | |
1326 | default: | |
1327 | WARN_ON_ONCE(1); | |
1328 | } | |
1329 | if (!ret) | |
1330 | event_notifier->registered = 1; | |
1331 | } | |
1332 | ||
1333 | static | |
1334 | int _lttng_event_notifier_unregister( | |
1335 | struct lttng_event_notifier *event_notifier) | |
1336 | { | |
1337 | const struct lttng_event_desc *desc; | |
1338 | int ret = -EINVAL; | |
1339 | ||
1340 | if (!event_notifier->registered) | |
1341 | return 0; | |
1342 | ||
1343 | desc = event_notifier->desc; | |
1344 | switch (event_notifier->instrumentation) { | |
1345 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1346 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname, |
1347 | event_notifier->desc->event_notifier_callback, | |
1348 | event_notifier); | |
1349 | break; | |
dffef45d | 1350 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1351 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1352 | ret = 0; | |
1353 | break; | |
9de67196 FD |
1354 | case LTTNG_KERNEL_UPROBE: |
1355 | lttng_uprobes_unregister_event_notifier(event_notifier); | |
1356 | ret = 0; | |
1357 | break; | |
8a8ac9a8 FD |
1358 | case LTTNG_KERNEL_SYSCALL: |
1359 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); | |
1360 | break; | |
dffef45d FD |
1361 | case LTTNG_KERNEL_KRETPROBE: |
1362 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d | 1363 | case LTTNG_KERNEL_NOOP: |
dffef45d FD |
1364 | default: |
1365 | WARN_ON_ONCE(1); | |
1366 | } | |
1367 | if (!ret) | |
1368 | event_notifier->registered = 0; | |
1369 | return ret; | |
1370 | } | |
1371 | ||
dda6a249 MD |
1372 | /* |
1373 | * Only used internally at session destruction. | |
1374 | */ | |
be066e6c | 1375 | static |
a90917c3 | 1376 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 1377 | { |
edeb3137 MD |
1378 | switch (event->instrumentation) { |
1379 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 1380 | lttng_event_desc_put(event->desc); |
edeb3137 MD |
1381 | break; |
1382 | case LTTNG_KERNEL_KPROBE: | |
1383 | module_put(event->desc->owner); | |
8bf17deb | 1384 | lttng_kprobes_destroy_event_private(event); |
edeb3137 | 1385 | break; |
7371f44c MD |
1386 | case LTTNG_KERNEL_KRETPROBE: |
1387 | module_put(event->desc->owner); | |
1388 | lttng_kretprobes_destroy_private(event); | |
1389 | break; | |
259b6cb3 | 1390 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 1391 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1392 | break; |
149b9a9d YB |
1393 | case LTTNG_KERNEL_UPROBE: |
1394 | module_put(event->desc->owner); | |
83b802dc | 1395 | lttng_uprobes_destroy_event_private(event); |
149b9a9d | 1396 | break; |
e884017c | 1397 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
1398 | default: |
1399 | WARN_ON_ONCE(1); | |
1400 | } | |
dda6a249 | 1401 | list_del(&event->list); |
8070f5c0 | 1402 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 1403 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1404 | } |
1405 | ||
dffef45d FD |
1406 | /* |
1407 | * Only used internally at session destruction. | |
1408 | */ | |
1409 | static | |
1410 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
1411 | { | |
1412 | switch (event_notifier->instrumentation) { | |
1413 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1414 | lttng_event_desc_put(event_notifier->desc); |
1415 | break; | |
dffef45d | 1416 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1417 | module_put(event_notifier->desc->owner); |
1418 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1419 | break; | |
8a8ac9a8 FD |
1420 | case LTTNG_KERNEL_NOOP: |
1421 | case LTTNG_KERNEL_SYSCALL: | |
1422 | break; | |
9de67196 FD |
1423 | case LTTNG_KERNEL_UPROBE: |
1424 | module_put(event_notifier->desc->owner); | |
1425 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1426 | break; | |
dffef45d FD |
1427 | case LTTNG_KERNEL_KRETPROBE: |
1428 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
1429 | default: |
1430 | WARN_ON_ONCE(1); | |
1431 | } | |
1432 | list_del(&event_notifier->list); | |
1433 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1434 | } | |
1435 | ||
d1f652f8 MD |
1436 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1437 | enum tracker_type tracker_type) | |
e0130fab | 1438 | { |
d1f652f8 MD |
1439 | switch (tracker_type) { |
1440 | case TRACKER_PID: | |
1441 | return &session->pid_tracker; | |
1442 | case TRACKER_VPID: | |
1443 | return &session->vpid_tracker; | |
1444 | case TRACKER_UID: | |
1445 | return &session->uid_tracker; | |
1446 | case TRACKER_VUID: | |
1447 | return &session->vuid_tracker; | |
1448 | case TRACKER_GID: | |
1449 | return &session->gid_tracker; | |
1450 | case TRACKER_VGID: | |
1451 | return &session->vgid_tracker; | |
1452 | default: | |
1453 | WARN_ON_ONCE(1); | |
1454 | return NULL; | |
1455 | } | |
1456 | } | |
1457 | ||
1458 | int lttng_session_track_id(struct lttng_session *session, | |
1459 | enum tracker_type tracker_type, int id) | |
1460 | { | |
1461 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1462 | int ret; |
1463 | ||
d1f652f8 MD |
1464 | tracker = get_tracker(session, tracker_type); |
1465 | if (!tracker) | |
1466 | return -EINVAL; | |
1467 | if (id < -1) | |
e0130fab MD |
1468 | return -EINVAL; |
1469 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1470 | if (id == -1) { |
1471 | /* track all ids: destroy tracker. */ | |
1472 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1473 | ret = 0; |
1474 | } else { | |
d1f652f8 | 1475 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1476 | } |
e0130fab MD |
1477 | mutex_unlock(&sessions_mutex); |
1478 | return ret; | |
1479 | } | |
1480 | ||
d1f652f8 MD |
1481 | int lttng_session_untrack_id(struct lttng_session *session, |
1482 | enum tracker_type tracker_type, int id) | |
e0130fab | 1483 | { |
d1f652f8 | 1484 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1485 | int ret; |
1486 | ||
d1f652f8 MD |
1487 | tracker = get_tracker(session, tracker_type); |
1488 | if (!tracker) | |
1489 | return -EINVAL; | |
1490 | if (id < -1) | |
e0130fab MD |
1491 | return -EINVAL; |
1492 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1493 | if (id == -1) { |
1494 | /* untrack all ids: replace by empty tracker. */ | |
1495 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1496 | } else { |
d1f652f8 | 1497 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1498 | } |
e0130fab MD |
1499 | mutex_unlock(&sessions_mutex); |
1500 | return ret; | |
1501 | } | |
1502 | ||
7e6f9ef6 | 1503 | static |
d1f652f8 | 1504 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1505 | { |
d1f652f8 MD |
1506 | struct lttng_id_tracker *id_tracker = m->private; |
1507 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1508 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1509 | int iter = 0, i; |
1510 | ||
1511 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1512 | if (id_tracker_p) { |
1513 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1514 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1515 | |
f934e302 | 1516 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1517 | if (iter++ >= *pos) |
1518 | return e; | |
1519 | } | |
1520 | } | |
1521 | } else { | |
d1f652f8 | 1522 | /* ID tracker disabled. */ |
7e6f9ef6 | 1523 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1524 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1525 | } |
1526 | iter++; | |
1527 | } | |
1528 | /* End of list */ | |
1529 | return NULL; | |
1530 | } | |
1531 | ||
1532 | /* Called with sessions_mutex held. */ | |
1533 | static | |
d1f652f8 | 1534 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1535 | { |
d1f652f8 MD |
1536 | struct lttng_id_tracker *id_tracker = m->private; |
1537 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1538 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1539 | int iter = 0, i; |
1540 | ||
1541 | (*ppos)++; | |
d1f652f8 MD |
1542 | if (id_tracker_p) { |
1543 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1544 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1545 | |
f934e302 | 1546 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1547 | if (iter++ >= *ppos) |
1548 | return e; | |
1549 | } | |
1550 | } | |
1551 | } else { | |
d1f652f8 | 1552 | /* ID tracker disabled. */ |
7e6f9ef6 | 1553 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1554 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1555 | iter++; |
1556 | } | |
1557 | ||
1558 | /* End of list */ | |
1559 | return NULL; | |
1560 | } | |
1561 | ||
1562 | static | |
d1f652f8 | 1563 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1564 | { |
1565 | mutex_unlock(&sessions_mutex); | |
1566 | } | |
1567 | ||
1568 | static | |
d1f652f8 | 1569 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1570 | { |
d1f652f8 MD |
1571 | struct lttng_id_tracker *id_tracker = m->private; |
1572 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1573 | int id; | |
7e6f9ef6 | 1574 | |
d1f652f8 | 1575 | if (p == id_tracker_p) { |
7e6f9ef6 | 1576 | /* Tracker disabled. */ |
d1f652f8 | 1577 | id = -1; |
7e6f9ef6 | 1578 | } else { |
d1f652f8 | 1579 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1580 | |
d1f652f8 MD |
1581 | id = lttng_id_tracker_get_node_id(e); |
1582 | } | |
1583 | switch (id_tracker->tracker_type) { | |
1584 | case TRACKER_PID: | |
1585 | seq_printf(m, "process { pid = %d; };\n", id); | |
1586 | break; | |
1587 | case TRACKER_VPID: | |
1588 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1589 | break; | |
1590 | case TRACKER_UID: | |
1591 | seq_printf(m, "user { uid = %d; };\n", id); | |
1592 | break; | |
1593 | case TRACKER_VUID: | |
1594 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1595 | break; | |
1596 | case TRACKER_GID: | |
1597 | seq_printf(m, "group { gid = %d; };\n", id); | |
1598 | break; | |
1599 | case TRACKER_VGID: | |
1600 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1601 | break; | |
1602 | default: | |
1603 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1604 | } |
7e6f9ef6 MD |
1605 | return 0; |
1606 | } | |
1607 | ||
1608 | static | |
d1f652f8 MD |
1609 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1610 | .start = id_list_start, | |
1611 | .next = id_list_next, | |
1612 | .stop = id_list_stop, | |
1613 | .show = id_list_show, | |
7e6f9ef6 MD |
1614 | }; |
1615 | ||
1616 | static | |
d1f652f8 | 1617 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1618 | { |
d1f652f8 | 1619 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1620 | } |
1621 | ||
1622 | static | |
d1f652f8 | 1623 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1624 | { |
1625 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1626 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1627 | int ret; |
1628 | ||
d1f652f8 | 1629 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1630 | ret = seq_release(inode, file); |
d1f652f8 MD |
1631 | if (!ret) |
1632 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1633 | return ret; |
1634 | } | |
1635 | ||
d1f652f8 | 1636 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1637 | .owner = THIS_MODULE, |
d1f652f8 | 1638 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1639 | .read = seq_read, |
1640 | .llseek = seq_lseek, | |
d1f652f8 | 1641 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1642 | }; |
1643 | ||
d1f652f8 MD |
1644 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1645 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1646 | { |
d1f652f8 | 1647 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1648 | struct seq_file *m; |
1649 | int file_fd, ret; | |
1650 | ||
1651 | file_fd = lttng_get_unused_fd(); | |
1652 | if (file_fd < 0) { | |
1653 | ret = file_fd; | |
1654 | goto fd_error; | |
1655 | } | |
1656 | ||
d1f652f8 MD |
1657 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1658 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1659 | NULL, O_RDWR); |
d1f652f8 MD |
1660 | if (IS_ERR(tracker_ids_list_file)) { |
1661 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1662 | goto file_error; |
1663 | } | |
98d7281c MJ |
1664 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1665 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1666 | goto refcount_error; |
1667 | } | |
d1f652f8 | 1668 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1669 | if (ret < 0) |
1670 | goto open_error; | |
d1f652f8 MD |
1671 | m = tracker_ids_list_file->private_data; |
1672 | ||
1673 | m->private = get_tracker(session, tracker_type); | |
1674 | BUG_ON(!m->private); | |
1675 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1676 | |
1677 | return file_fd; | |
1678 | ||
1679 | open_error: | |
9c1f4643 MD |
1680 | atomic_long_dec(&session->file->f_count); |
1681 | refcount_error: | |
d1f652f8 | 1682 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1683 | file_error: |
1684 | put_unused_fd(file_fd); | |
1685 | fd_error: | |
1686 | return ret; | |
1687 | } | |
1688 | ||
3c997079 MD |
1689 | /* |
1690 | * Enabler management. | |
1691 | */ | |
1692 | static | |
4993071a PP |
1693 | int lttng_match_enabler_star_glob(const char *desc_name, |
1694 | const char *pattern) | |
3c997079 | 1695 | { |
cbc19040 MD |
1696 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1697 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1698 | return 0; |
1699 | return 1; | |
1700 | } | |
1701 | ||
1702 | static | |
4ecb5ad5 MD |
1703 | int lttng_match_enabler_name(const char *desc_name, |
1704 | const char *name) | |
3c997079 | 1705 | { |
4ecb5ad5 | 1706 | if (strcmp(desc_name, name)) |
3c997079 MD |
1707 | return 0; |
1708 | return 1; | |
1709 | } | |
1710 | ||
3c997079 MD |
1711 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, |
1712 | struct lttng_enabler *enabler) | |
1713 | { | |
4ecb5ad5 | 1714 | const char *desc_name, *enabler_name; |
badfe9f5 | 1715 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1716 | |
1717 | enabler_name = enabler->event_param.name; | |
1718 | switch (enabler->event_param.instrumentation) { | |
1719 | case LTTNG_KERNEL_TRACEPOINT: | |
1720 | desc_name = desc->name; | |
3b861b22 FD |
1721 | switch (enabler->format_type) { |
1722 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1723 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1724 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1725 | return lttng_match_enabler_name(desc_name, enabler_name); |
1726 | default: | |
1727 | return -EINVAL; | |
1728 | } | |
4ecb5ad5 MD |
1729 | break; |
1730 | case LTTNG_KERNEL_SYSCALL: | |
1731 | desc_name = desc->name; | |
badfe9f5 | 1732 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1733 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1734 | compat = true; |
1735 | } | |
4ecb5ad5 MD |
1736 | if (!strncmp(desc_name, "syscall_exit_", |
1737 | strlen("syscall_exit_"))) { | |
1738 | desc_name += strlen("syscall_exit_"); | |
1739 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1740 | strlen("syscall_entry_"))) { | |
1741 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1742 | entry = true; |
4ecb5ad5 MD |
1743 | } else { |
1744 | WARN_ON_ONCE(1); | |
1745 | return -EINVAL; | |
1746 | } | |
badfe9f5 MD |
1747 | switch (enabler->event_param.u.syscall.entryexit) { |
1748 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1749 | break; | |
1750 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1751 | if (!entry) | |
1752 | return 0; | |
1753 | break; | |
1754 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1755 | if (entry) | |
1756 | return 0; | |
1757 | break; | |
1758 | default: | |
1759 | return -EINVAL; | |
1760 | } | |
1761 | switch (enabler->event_param.u.syscall.abi) { | |
1762 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1763 | break; | |
1764 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1765 | if (compat) | |
1766 | return 0; | |
1767 | break; | |
1768 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1769 | if (!compat) | |
1770 | return 0; | |
1771 | break; | |
1772 | default: | |
1773 | return -EINVAL; | |
1774 | } | |
1775 | switch (enabler->event_param.u.syscall.match) { | |
cff6938b | 1776 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1777 | switch (enabler->format_type) { |
1778 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1779 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1780 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1781 | return lttng_match_enabler_name(desc_name, enabler_name); |
1782 | default: | |
1783 | return -EINVAL; | |
1784 | } | |
1785 | break; | |
cff6938b | 1786 | case LTTNG_KERNEL_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1787 | return -EINVAL; /* Not implemented. */ |
1788 | default: | |
1789 | return -EINVAL; | |
1790 | } | |
4ecb5ad5 MD |
1791 | break; |
1792 | default: | |
1793 | WARN_ON_ONCE(1); | |
1794 | return -EINVAL; | |
1795 | } | |
3c997079 MD |
1796 | } |
1797 | ||
1798 | static | |
b2bc0bc8 FD |
1799 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1800 | struct lttng_event *event) | |
3c997079 | 1801 | { |
b2bc0bc8 FD |
1802 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1803 | event_enabler); | |
1804 | ||
1805 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1806 | return 0; |
b2bc0bc8 FD |
1807 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1808 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1809 | return 1; |
1810 | else | |
1811 | return 0; | |
1812 | } | |
1813 | ||
b01155ba FD |
1814 | static |
1815 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1816 | struct lttng_event_notifier *event_notifier) | |
1817 | { | |
1818 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
1819 | event_notifier_enabler); | |
1820 | ||
1821 | if (base_enabler->event_param.instrumentation != event_notifier->instrumentation) | |
1822 | return 0; | |
1823 | if (lttng_desc_match_enabler(event_notifier->desc, base_enabler) | |
1824 | && event_notifier->group == event_notifier_enabler->group | |
1825 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1826 | return 1; | |
1827 | else | |
1828 | return 0; | |
1829 | } | |
1830 | ||
3c997079 | 1831 | static |
b2bc0bc8 FD |
1832 | struct lttng_enabler_ref *lttng_enabler_ref( |
1833 | struct list_head *enablers_ref_list, | |
3c997079 MD |
1834 | struct lttng_enabler *enabler) |
1835 | { | |
1836 | struct lttng_enabler_ref *enabler_ref; | |
1837 | ||
b2bc0bc8 | 1838 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
1839 | if (enabler_ref->ref == enabler) |
1840 | return enabler_ref; | |
1841 | } | |
1842 | return NULL; | |
1843 | } | |
1844 | ||
3c997079 | 1845 | static |
1b917d6b | 1846 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 1847 | { |
b2bc0bc8 | 1848 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
1849 | struct lttng_probe_desc *probe_desc; |
1850 | const struct lttng_event_desc *desc; | |
1851 | int i; | |
1852 | struct list_head *probe_list; | |
1853 | ||
1854 | probe_list = lttng_get_probe_list_head(); | |
1855 | /* | |
1856 | * For each probe event, if we find that a probe event matches | |
1857 | * our enabler, create an associated lttng_event if not | |
1858 | * already present. | |
1859 | */ | |
1860 | list_for_each_entry(probe_desc, probe_list, head) { | |
1861 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1862 | int found = 0; | |
1863 | struct hlist_head *head; | |
3c997079 MD |
1864 | struct lttng_event *event; |
1865 | ||
1866 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
1867 | if (!lttng_desc_match_enabler(desc, |
1868 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 1869 | continue; |
3c997079 MD |
1870 | |
1871 | /* | |
1872 | * Check if already created. | |
1873 | */ | |
4a11ef1c FD |
1874 | head = utils_borrow_hash_table_bucket( |
1875 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
1876 | desc->name); | |
d216ecae | 1877 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 1878 | if (event->desc == desc |
b2bc0bc8 | 1879 | && event->chan == event_enabler->chan) |
3c997079 MD |
1880 | found = 1; |
1881 | } | |
1882 | if (found) | |
1883 | continue; | |
1884 | ||
1885 | /* | |
1886 | * We need to create an event for this | |
1887 | * event probe. | |
1888 | */ | |
b2bc0bc8 | 1889 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
1890 | NULL, NULL, desc, |
1891 | LTTNG_KERNEL_TRACEPOINT); | |
1892 | if (!event) { | |
5a15f70c | 1893 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
1894 | probe_desc->event_desc[i]->name); |
1895 | } | |
1896 | } | |
1897 | } | |
1898 | } | |
1899 | ||
b01155ba FD |
1900 | static |
1901 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1902 | { | |
1903 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1904 | struct lttng_probe_desc *probe_desc; | |
1905 | const struct lttng_event_desc *desc; | |
1906 | int i; | |
1907 | struct list_head *probe_list; | |
1908 | ||
1909 | probe_list = lttng_get_probe_list_head(); | |
1910 | /* | |
1911 | * For each probe event, if we find that a probe event matches | |
1912 | * our enabler, create an associated lttng_event_notifier if not | |
1913 | * already present. | |
1914 | */ | |
1915 | list_for_each_entry(probe_desc, probe_list, head) { | |
1916 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1917 | int found = 0; | |
1918 | struct hlist_head *head; | |
1919 | struct lttng_event_notifier *event_notifier; | |
1920 | ||
1921 | desc = probe_desc->event_desc[i]; | |
1922 | if (!lttng_desc_match_enabler(desc, | |
1923 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1924 | continue; | |
1925 | ||
1926 | /* | |
1927 | * Check if already created. | |
1928 | */ | |
1929 | head = utils_borrow_hash_table_bucket( | |
1930 | event_notifier_group->event_notifiers_ht.table, | |
1931 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
1932 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1933 | if (event_notifier->desc == desc | |
1934 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1935 | found = 1; | |
1936 | } | |
1937 | if (found) | |
1938 | continue; | |
1939 | ||
1940 | /* | |
1941 | * We need to create a event_notifier for this event probe. | |
1942 | */ | |
1943 | event_notifier = _lttng_event_notifier_create(desc, | |
1944 | event_notifier_enabler->base.user_token, | |
1945 | event_notifier_group, NULL, NULL, | |
1946 | LTTNG_KERNEL_TRACEPOINT); | |
1947 | if (IS_ERR(event_notifier)) { | |
1948 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
1949 | probe_desc->event_desc[i]->name); | |
1950 | } | |
1951 | } | |
1952 | } | |
1953 | } | |
1954 | ||
33a39a3c | 1955 | static |
1b917d6b | 1956 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
1957 | { |
1958 | int ret; | |
1959 | ||
2d6d88c6 | 1960 | ret = lttng_syscalls_register_event(event_enabler->chan, NULL); |
33a39a3c MD |
1961 | WARN_ON_ONCE(ret); |
1962 | } | |
1963 | ||
8a8ac9a8 FD |
1964 | static |
1965 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1966 | { | |
1967 | int ret; | |
1968 | ||
1969 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL); | |
1970 | WARN_ON_ONCE(ret); | |
1971 | ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL); | |
1972 | WARN_ON_ONCE(ret); | |
1973 | } | |
1974 | ||
33a39a3c MD |
1975 | /* |
1976 | * Create struct lttng_event if it is missing and present in the list of | |
1977 | * tracepoint probes. | |
1978 | * Should be called with sessions mutex held. | |
1979 | */ | |
1980 | static | |
b2bc0bc8 | 1981 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 1982 | { |
b2bc0bc8 | 1983 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 1984 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 1985 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c MD |
1986 | break; |
1987 | case LTTNG_KERNEL_SYSCALL: | |
1b917d6b | 1988 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c MD |
1989 | break; |
1990 | default: | |
1991 | WARN_ON_ONCE(1); | |
1992 | break; | |
1993 | } | |
1994 | } | |
1995 | ||
3c997079 | 1996 | /* |
b2bc0bc8 | 1997 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
1998 | * and add backward reference from the event to the enabler. |
1999 | * Should be called with sessions mutex held. | |
2000 | */ | |
2001 | static | |
b2bc0bc8 | 2002 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2003 | { |
b2bc0bc8 FD |
2004 | struct lttng_channel *chan = event_enabler->chan; |
2005 | struct lttng_session *session = event_enabler->chan->session; | |
2006 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
2007 | struct lttng_event *event; |
2008 | ||
b2bc0bc8 FD |
2009 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
2010 | base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && | |
2011 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
cff6938b | 2012 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && |
b2bc0bc8 FD |
2013 | !strcmp(base_enabler->event_param.name, "*")) { |
2014 | if (base_enabler->enabled) | |
badfe9f5 MD |
2015 | WRITE_ONCE(chan->syscall_all, 1); |
2016 | else | |
2017 | WRITE_ONCE(chan->syscall_all, 0); | |
2018 | } | |
2019 | ||
3c997079 | 2020 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2021 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2022 | |
b2bc0bc8 | 2023 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
2024 | list_for_each_entry(event, &session->events, list) { |
2025 | struct lttng_enabler_ref *enabler_ref; | |
2026 | ||
b2bc0bc8 | 2027 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 2028 | continue; |
b2bc0bc8 FD |
2029 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
2030 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
2031 | if (!enabler_ref) { |
2032 | /* | |
2033 | * If no backward ref, create it. | |
b2bc0bc8 | 2034 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2035 | */ |
2036 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2037 | if (!enabler_ref) | |
2038 | return -ENOMEM; | |
b2bc0bc8 | 2039 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
2040 | list_add(&enabler_ref->node, |
2041 | &event->enablers_ref_head); | |
2042 | } | |
2043 | ||
f127e61e MD |
2044 | /* |
2045 | * Link filter bytecodes if not linked yet. | |
2046 | */ | |
2dfda770 FD |
2047 | lttng_enabler_link_bytecode(event->desc, |
2048 | lttng_static_ctx, | |
183e8b3a | 2049 | &event->filter_bytecode_runtime_head, |
60206944 | 2050 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
f127e61e | 2051 | |
3c997079 MD |
2052 | /* TODO: merge event context. */ |
2053 | } | |
2054 | return 0; | |
2055 | } | |
2056 | ||
b01155ba FD |
2057 | /* |
2058 | * Create struct lttng_event_notifier if it is missing and present in the list of | |
2059 | * tracepoint probes. | |
2060 | * Should be called with sessions mutex held. | |
2061 | */ | |
2062 | static | |
2063 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2064 | { | |
2065 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
2066 | case LTTNG_KERNEL_TRACEPOINT: | |
2067 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); | |
2068 | break; | |
8a8ac9a8 FD |
2069 | case LTTNG_KERNEL_SYSCALL: |
2070 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); | |
2071 | break; | |
b01155ba FD |
2072 | default: |
2073 | WARN_ON_ONCE(1); | |
2074 | break; | |
2075 | } | |
2076 | } | |
2077 | ||
2078 | /* | |
2079 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2080 | */ | |
2081 | static | |
8a8ac9a8 FD |
2082 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2083 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2084 | { |
2085 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2086 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
b01155ba FD |
2087 | struct lttng_event_notifier *event_notifier; |
2088 | ||
8a8ac9a8 FD |
2089 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
2090 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
2091 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && | |
2092 | !strcmp(base_enabler->event_param.name, "*")) { | |
2093 | ||
2094 | int enabled = base_enabler->enabled; | |
2095 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2096 | ||
2097 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2098 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); | |
2099 | ||
2100 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2101 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); | |
2102 | ||
2103 | } | |
2104 | ||
b01155ba FD |
2105 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2106 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2107 | ||
2108 | /* Link the created event_notifier with its associated enabler. */ | |
2109 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2110 | struct lttng_enabler_ref *enabler_ref; | |
2111 | ||
2112 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2113 | continue; | |
2114 | ||
2115 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
2116 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2117 | if (!enabler_ref) { | |
2118 | /* | |
2119 | * If no backward ref, create it. | |
2120 | * Add backward ref from event_notifier to enabler. | |
2121 | */ | |
2122 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2123 | if (!enabler_ref) | |
2124 | return -ENOMEM; | |
2125 | ||
2126 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2127 | event_notifier_enabler); | |
2128 | list_add(&enabler_ref->node, | |
2129 | &event_notifier->enablers_ref_head); | |
2130 | } | |
2131 | ||
2132 | /* | |
2133 | * Link filter bytecodes if not linked yet. | |
2134 | */ | |
2135 | lttng_enabler_link_bytecode(event_notifier->desc, | |
183e8b3a | 2136 | lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head, |
60206944 | 2137 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2138 | |
2139 | /* Link capture bytecodes if not linked yet. */ | |
2140 | lttng_enabler_link_bytecode(event_notifier->desc, | |
2141 | lttng_static_ctx, &event_notifier->capture_bytecode_runtime_head, | |
2142 | &event_notifier_enabler->capture_bytecode_head); | |
2143 | ||
2144 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
b01155ba FD |
2145 | } |
2146 | return 0; | |
2147 | } | |
2148 | ||
3c997079 MD |
2149 | /* |
2150 | * Called at module load: connect the probe on all enablers matching | |
2151 | * this event. | |
2152 | * Called with sessions lock held. | |
2153 | */ | |
2154 | int lttng_fix_pending_events(void) | |
2155 | { | |
2156 | struct lttng_session *session; | |
2157 | ||
2158 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2159 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2160 | return 0; |
2161 | } | |
2162 | ||
b01155ba FD |
2163 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2164 | struct lttng_event_notifier_group *event_notifier_group) | |
2165 | { | |
2166 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2167 | ||
2168 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2169 | node) { | |
2170 | if (event_notifier_enabler->base.enabled) | |
2171 | return true; | |
2172 | } | |
2173 | return false; | |
2174 | } | |
2175 | ||
2176 | bool lttng_event_notifier_active(void) | |
2177 | { | |
2178 | struct lttng_event_notifier_group *event_notifier_group; | |
2179 | ||
2180 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2181 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2182 | return true; | |
2183 | } | |
2184 | return false; | |
2185 | } | |
2186 | ||
2187 | int lttng_fix_pending_event_notifiers(void) | |
2188 | { | |
2189 | struct lttng_event_notifier_group *event_notifier_group; | |
2190 | ||
2191 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2192 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2193 | return 0; | |
2194 | } | |
2195 | ||
b2bc0bc8 FD |
2196 | struct lttng_event_enabler *lttng_event_enabler_create( |
2197 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
2198 | struct lttng_kernel_event *event_param, |
2199 | struct lttng_channel *chan) | |
2200 | { | |
b2bc0bc8 | 2201 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2202 | |
b2bc0bc8 FD |
2203 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2204 | if (!event_enabler) | |
3c997079 | 2205 | return NULL; |
b2bc0bc8 FD |
2206 | event_enabler->base.format_type = format_type; |
2207 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2208 | memcpy(&event_enabler->base.event_param, event_param, | |
2209 | sizeof(event_enabler->base.event_param)); | |
2210 | event_enabler->chan = chan; | |
3c997079 | 2211 | /* ctx left NULL */ |
b2bc0bc8 FD |
2212 | event_enabler->base.enabled = 0; |
2213 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 2214 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2215 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2216 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2217 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2218 | return event_enabler; |
3c997079 MD |
2219 | } |
2220 | ||
b2bc0bc8 | 2221 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2222 | { |
2223 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2224 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2225 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2226 | mutex_unlock(&sessions_mutex); |
2227 | return 0; | |
2228 | } | |
2229 | ||
b2bc0bc8 | 2230 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2231 | { |
2232 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2233 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2234 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2235 | mutex_unlock(&sessions_mutex); |
2236 | return 0; | |
2237 | } | |
2238 | ||
b2bc0bc8 | 2239 | static |
183e8b3a | 2240 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
07dfc1d0 MD |
2241 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2242 | { | |
89ec2b91 | 2243 | struct lttng_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2244 | uint32_t bytecode_len; |
2245 | int ret; | |
2246 | ||
2247 | ret = get_user(bytecode_len, &bytecode->len); | |
2248 | if (ret) | |
2249 | return ret; | |
52cfcdf3 | 2250 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2251 | GFP_KERNEL); |
2252 | if (!bytecode_node) | |
2253 | return -ENOMEM; | |
2254 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2255 | sizeof(*bytecode) + bytecode_len); | |
2256 | if (ret) | |
2257 | goto error_free; | |
b2bc0bc8 | 2258 | |
89ec2b91 | 2259 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER; |
07dfc1d0 MD |
2260 | bytecode_node->enabler = enabler; |
2261 | /* Enforce length based on allocated size */ | |
2262 | bytecode_node->bc.len = bytecode_len; | |
2263 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2264 | |
07dfc1d0 MD |
2265 | return 0; |
2266 | ||
2267 | error_free: | |
52cfcdf3 | 2268 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2269 | return ret; |
2270 | } | |
2271 | ||
183e8b3a | 2272 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
b2bc0bc8 FD |
2273 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2274 | { | |
2275 | int ret; | |
183e8b3a | 2276 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2277 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2278 | if (ret) | |
2279 | goto error; | |
2280 | ||
2281 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2282 | return 0; | |
2283 | ||
2284 | error: | |
2285 | return ret; | |
2286 | } | |
2287 | ||
3aed4dca FD |
2288 | int lttng_event_add_callsite(struct lttng_event *event, |
2289 | struct lttng_kernel_event_callsite __user *callsite) | |
2290 | { | |
2291 | ||
2292 | switch (event->instrumentation) { | |
2293 | case LTTNG_KERNEL_UPROBE: | |
83b802dc | 2294 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2295 | default: |
2296 | return -EINVAL; | |
2297 | } | |
2298 | } | |
2299 | ||
b2bc0bc8 | 2300 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
2301 | struct lttng_kernel_context *context_param) |
2302 | { | |
2303 | return -ENOSYS; | |
2304 | } | |
2305 | ||
2306 | static | |
2307 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2308 | { | |
89ec2b91 | 2309 | struct lttng_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2310 | |
2311 | /* Destroy filter bytecode */ | |
2312 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2313 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2314 | lttng_kvfree(filter_node); |
07dfc1d0 | 2315 | } |
b2bc0bc8 FD |
2316 | } |
2317 | ||
2318 | static | |
2319 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2320 | { | |
2321 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2322 | |
3c997079 | 2323 | /* Destroy contexts */ |
b2bc0bc8 | 2324 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 2325 | |
b2bc0bc8 FD |
2326 | list_del(&event_enabler->node); |
2327 | kfree(event_enabler); | |
3c997079 MD |
2328 | } |
2329 | ||
dffef45d FD |
2330 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2331 | struct lttng_event_notifier_group *event_notifier_group, | |
2332 | enum lttng_enabler_format_type format_type, | |
2333 | struct lttng_kernel_event_notifier *event_notifier_param) | |
2334 | { | |
2335 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2336 | ||
2337 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2338 | if (!event_notifier_enabler) | |
2339 | return NULL; | |
2340 | ||
2341 | event_notifier_enabler->base.format_type = format_type; | |
2342 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2343 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2344 | ||
2345 | event_notifier_enabler->num_captures = 0; | |
dffef45d | 2346 | |
8a8ac9a8 FD |
2347 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2348 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2349 | event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER; |
2350 | ||
2351 | event_notifier_enabler->base.enabled = 0; | |
2352 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2353 | event_notifier_enabler->group = event_notifier_group; | |
2354 | ||
2355 | mutex_lock(&sessions_mutex); | |
2356 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2357 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2358 | |
2359 | mutex_unlock(&sessions_mutex); | |
2360 | ||
2361 | return event_notifier_enabler; | |
2362 | } | |
2363 | ||
2364 | int lttng_event_notifier_enabler_enable( | |
2365 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2366 | { | |
2367 | mutex_lock(&sessions_mutex); | |
2368 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2369 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2370 | mutex_unlock(&sessions_mutex); |
2371 | return 0; | |
2372 | } | |
2373 | ||
2374 | int lttng_event_notifier_enabler_disable( | |
2375 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2376 | { | |
2377 | mutex_lock(&sessions_mutex); | |
2378 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2379 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2380 | mutex_unlock(&sessions_mutex); |
2381 | return 0; | |
2382 | } | |
2383 | ||
183e8b3a | 2384 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d FD |
2385 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
2386 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2387 | { | |
2388 | int ret; | |
2389 | ||
183e8b3a | 2390 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2391 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2392 | bytecode); | |
2393 | if (ret) | |
2394 | goto error; | |
2395 | ||
b01155ba | 2396 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2397 | return 0; |
2398 | ||
2399 | error: | |
2400 | return ret; | |
2401 | } | |
2402 | ||
99d223ad FD |
2403 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2404 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2405 | struct lttng_kernel_capture_bytecode __user *bytecode) | |
2406 | { | |
2407 | struct lttng_bytecode_node *bytecode_node; | |
2408 | struct lttng_enabler *enabler = | |
2409 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2410 | uint32_t bytecode_len; | |
2411 | int ret; | |
2412 | ||
2413 | ret = get_user(bytecode_len, &bytecode->len); | |
2414 | if (ret) | |
2415 | return ret; | |
2416 | ||
2417 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2418 | GFP_KERNEL); | |
2419 | if (!bytecode_node) | |
2420 | return -ENOMEM; | |
2421 | ||
2422 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2423 | sizeof(*bytecode) + bytecode_len); | |
2424 | if (ret) | |
2425 | goto error_free; | |
2426 | ||
2427 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE; | |
2428 | bytecode_node->enabler = enabler; | |
2429 | ||
2430 | /* Enforce length based on allocated size */ | |
2431 | bytecode_node->bc.len = bytecode_len; | |
2432 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2433 | ||
2434 | event_notifier_enabler->num_captures++; | |
2435 | ||
2436 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2437 | goto end; | |
2438 | ||
2439 | error_free: | |
2440 | lttng_kvfree(bytecode_node); | |
2441 | end: | |
2442 | return ret; | |
2443 | } | |
2444 | ||
9de67196 FD |
2445 | int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier, |
2446 | struct lttng_kernel_event_callsite __user *callsite) | |
2447 | { | |
2448 | ||
2449 | switch (event_notifier->instrumentation) { | |
2450 | case LTTNG_KERNEL_UPROBE: | |
2451 | return lttng_uprobes_event_notifier_add_callsite(event_notifier, | |
2452 | callsite); | |
2453 | default: | |
2454 | return -EINVAL; | |
2455 | } | |
2456 | } | |
2457 | ||
dffef45d FD |
2458 | int lttng_event_notifier_enabler_attach_context( |
2459 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2460 | struct lttng_kernel_context *context_param) | |
2461 | { | |
2462 | return -ENOSYS; | |
2463 | } | |
2464 | ||
2465 | static | |
2466 | void lttng_event_notifier_enabler_destroy( | |
2467 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2468 | { | |
2469 | if (!event_notifier_enabler) { | |
2470 | return; | |
2471 | } | |
2472 | ||
2473 | list_del(&event_notifier_enabler->node); | |
2474 | ||
2475 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2476 | kfree(event_notifier_enabler); | |
2477 | } | |
2478 | ||
3c997079 | 2479 | /* |
b2bc0bc8 | 2480 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2481 | * session. |
2482 | * Should be called with sessions mutex held. | |
2483 | */ | |
2484 | static | |
b2bc0bc8 | 2485 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2486 | { |
b2bc0bc8 | 2487 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2488 | struct lttng_event *event; |
2489 | ||
b2bc0bc8 FD |
2490 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2491 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2492 | /* |
2493 | * For each event, if at least one of its enablers is enabled, | |
2494 | * and its channel and session transient states are enabled, we | |
2495 | * enable the event, else we disable it. | |
2496 | */ | |
2497 | list_for_each_entry(event, &session->events, list) { | |
2498 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
2499 | struct lttng_bytecode_runtime *runtime; |
2500 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2501 | |
4ecb5ad5 MD |
2502 | switch (event->instrumentation) { |
2503 | case LTTNG_KERNEL_TRACEPOINT: | |
2504 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
2505 | /* Enable events */ |
2506 | list_for_each_entry(enabler_ref, | |
2507 | &event->enablers_ref_head, node) { | |
2508 | if (enabler_ref->ref->enabled) { | |
2509 | enabled = 1; | |
2510 | break; | |
2511 | } | |
2512 | } | |
4ecb5ad5 MD |
2513 | break; |
2514 | default: | |
3c997079 MD |
2515 | /* Not handled with lazy sync. */ |
2516 | continue; | |
2517 | } | |
2518 | /* | |
2519 | * Enabled state is based on union of enablers, with | |
2520 | * intesection of session and channel transient enable | |
2521 | * states. | |
2522 | */ | |
2523 | enabled = enabled && session->tstate && event->chan->tstate; | |
2524 | ||
a8f2d0c7 | 2525 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
2526 | /* |
2527 | * Sync tracepoint registration with event enabled | |
2528 | * state. | |
2529 | */ | |
2530 | if (enabled) { | |
2531 | register_event(event); | |
2532 | } else { | |
2533 | _lttng_event_unregister(event); | |
2534 | } | |
07dfc1d0 MD |
2535 | |
2536 | /* Check if has enablers without bytecode enabled */ | |
2537 | list_for_each_entry(enabler_ref, | |
2538 | &event->enablers_ref_head, node) { | |
2539 | if (enabler_ref->ref->enabled | |
2540 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2541 | has_enablers_without_bytecode = 1; | |
2542 | break; | |
2543 | } | |
2544 | } | |
2545 | event->has_enablers_without_bytecode = | |
2546 | has_enablers_without_bytecode; | |
2547 | ||
2548 | /* Enable filters */ | |
2549 | list_for_each_entry(runtime, | |
183e8b3a | 2550 | &event->filter_bytecode_runtime_head, node) |
0b365677 | 2551 | lttng_bytecode_filter_sync_state(runtime); |
3c997079 MD |
2552 | } |
2553 | } | |
2554 | ||
2555 | /* | |
2556 | * Apply enablers to session events, adding events to session if need | |
2557 | * be. It is required after each modification applied to an active | |
2558 | * session, and right before session "start". | |
2559 | * "lazy" sync means we only sync if required. | |
2560 | * Should be called with sessions mutex held. | |
2561 | */ | |
2562 | static | |
b2bc0bc8 | 2563 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2564 | { |
2565 | /* We can skip if session is not active */ | |
2566 | if (!session->active) | |
2567 | return; | |
b2bc0bc8 | 2568 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2569 | } |
2570 | ||
b01155ba FD |
2571 | static |
2572 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2573 | { | |
2574 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2575 | struct lttng_event_notifier *event_notifier; | |
2576 | ||
2577 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2578 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2579 | ||
2580 | /* | |
2581 | * For each event_notifier, if at least one of its enablers is enabled, | |
2582 | * we enable the event_notifier, else we disable it. | |
2583 | */ | |
2584 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2585 | struct lttng_enabler_ref *enabler_ref; | |
2586 | struct lttng_bytecode_runtime *runtime; | |
2587 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2588 | ||
2589 | switch (event_notifier->instrumentation) { | |
2590 | case LTTNG_KERNEL_TRACEPOINT: | |
2591 | case LTTNG_KERNEL_SYSCALL: | |
2592 | /* Enable event_notifiers */ | |
2593 | list_for_each_entry(enabler_ref, | |
2594 | &event_notifier->enablers_ref_head, node) { | |
2595 | if (enabler_ref->ref->enabled) { | |
2596 | enabled = 1; | |
2597 | break; | |
2598 | } | |
2599 | } | |
2600 | break; | |
2601 | default: | |
2602 | /* Not handled with sync. */ | |
2603 | continue; | |
2604 | } | |
2605 | ||
2606 | WRITE_ONCE(event_notifier->enabled, enabled); | |
2607 | /* | |
2608 | * Sync tracepoint registration with event_notifier enabled | |
2609 | * state. | |
2610 | */ | |
2611 | if (enabled) { | |
2612 | if (!event_notifier->registered) | |
2613 | register_event_notifier(event_notifier); | |
2614 | } else { | |
2615 | if (event_notifier->registered) | |
2616 | _lttng_event_notifier_unregister(event_notifier); | |
2617 | } | |
2618 | ||
2619 | /* Check if has enablers without bytecode enabled */ | |
2620 | list_for_each_entry(enabler_ref, | |
2621 | &event_notifier->enablers_ref_head, node) { | |
2622 | if (enabler_ref->ref->enabled | |
2623 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2624 | has_enablers_without_bytecode = 1; | |
2625 | break; | |
2626 | } | |
2627 | } | |
2628 | event_notifier->has_enablers_without_bytecode = | |
2629 | has_enablers_without_bytecode; | |
2630 | ||
2631 | /* Enable filters */ | |
2632 | list_for_each_entry(runtime, | |
183e8b3a | 2633 | &event_notifier->filter_bytecode_runtime_head, node) |
0b365677 | 2634 | lttng_bytecode_filter_sync_state(runtime); |
99d223ad FD |
2635 | |
2636 | /* Enable captures */ | |
2637 | list_for_each_entry(runtime, | |
2638 | &event_notifier->capture_bytecode_runtime_head, node) | |
2639 | lttng_bytecode_capture_sync_state(runtime); | |
b01155ba FD |
2640 | } |
2641 | } | |
2642 | ||
1ec3f75a | 2643 | /* |
d83004aa JD |
2644 | * Serialize at most one packet worth of metadata into a metadata |
2645 | * channel. | |
92d9f5e6 MD |
2646 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2647 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2648 | * allows us to do racy operations such as looking for remaining space left in | |
2649 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2650 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2651 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2652 | * Returns the number of bytes written in the channel, 0 if no data |
2653 | * was written and a negative value on error. | |
1ec3f75a | 2654 | */ |
b3b8072b | 2655 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2656 | struct channel *chan, bool *coherent) |
d83004aa JD |
2657 | { |
2658 | struct lib_ring_buffer_ctx ctx; | |
2659 | int ret = 0; | |
2660 | size_t len, reserve_len; | |
2661 | ||
f613e3e6 | 2662 | /* |
92d9f5e6 MD |
2663 | * Ensure we support mutiple get_next / put sequences followed by |
2664 | * put_next. The metadata cache lock protects reading the metadata | |
2665 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2666 | * "flush" operations on the buffer invoked by different processes. | |
2667 | * Moreover, since the metadata cache memory can be reallocated, we | |
2668 | * need to have exclusive access against updates even though we only | |
2669 | * read it. | |
f613e3e6 | 2670 | */ |
92d9f5e6 | 2671 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2672 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2673 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2674 | goto end; |
f613e3e6 | 2675 | |
9616f0bf JD |
2676 | /* Metadata regenerated, change the version. */ |
2677 | if (stream->metadata_cache->version != stream->version) | |
2678 | stream->version = stream->metadata_cache->version; | |
2679 | ||
d83004aa | 2680 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2681 | stream->metadata_in; |
9de2c215 | 2682 | if (!len) |
de23d59d | 2683 | goto end; |
d83004aa | 2684 | reserve_len = min_t(size_t, |
b3b8072b | 2685 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2686 | len); |
b3b8072b | 2687 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2688 | sizeof(char), -1); |
2689 | /* | |
2690 | * If reservation failed, return an error to the caller. | |
2691 | */ | |
b3b8072b | 2692 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2693 | if (ret != 0) { |
2694 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2695 | stream->coherent = false; |
d83004aa JD |
2696 | goto end; |
2697 | } | |
b3b8072b | 2698 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2699 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2700 | reserve_len); |
b3b8072b | 2701 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2702 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2703 | if (reserve_len < len) |
8b97fd42 MD |
2704 | stream->coherent = false; |
2705 | else | |
2706 | stream->coherent = true; | |
d83004aa JD |
2707 | ret = reserve_len; |
2708 | ||
2709 | end: | |
8b97fd42 MD |
2710 | if (coherent) |
2711 | *coherent = stream->coherent; | |
92d9f5e6 | 2712 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2713 | return ret; |
2714 | } | |
2715 | ||
8b97fd42 MD |
2716 | static |
2717 | void lttng_metadata_begin(struct lttng_session *session) | |
2718 | { | |
3e75e2a7 MD |
2719 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2720 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2721 | } |
2722 | ||
2723 | static | |
2724 | void lttng_metadata_end(struct lttng_session *session) | |
2725 | { | |
3e75e2a7 MD |
2726 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2727 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2728 | struct lttng_metadata_stream *stream; | |
2729 | ||
3e75e2a7 MD |
2730 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2731 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2732 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2733 | } |
8b97fd42 MD |
2734 | } |
2735 | ||
d83004aa JD |
2736 | /* |
2737 | * Write the metadata to the metadata cache. | |
2738 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2739 | * The metadata cache lock protects us from concurrent read access from |
2740 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2741 | * The content of the printf is printed as a single atomic metadata |
2742 | * transaction. | |
d83004aa | 2743 | */ |
a90917c3 | 2744 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2745 | const char *fmt, ...) |
2746 | { | |
c099397a | 2747 | char *str; |
d83004aa | 2748 | size_t len; |
c099397a MD |
2749 | va_list ap; |
2750 | ||
585e5dcc | 2751 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2752 | |
2753 | va_start(ap, fmt); | |
2754 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2755 | va_end(ap); | |
2756 | if (!str) | |
2757 | return -ENOMEM; | |
2758 | ||
1ec3f75a | 2759 | len = strlen(str); |
3e75e2a7 | 2760 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2761 | if (session->metadata_cache->metadata_written + len > |
2762 | session->metadata_cache->cache_alloc) { | |
2763 | char *tmp_cache_realloc; | |
2764 | unsigned int tmp_cache_alloc_size; | |
2765 | ||
2766 | tmp_cache_alloc_size = max_t(unsigned int, | |
2767 | session->metadata_cache->cache_alloc + len, | |
2768 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2769 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2770 | if (!tmp_cache_realloc) |
2771 | goto err; | |
a606b6e8 ML |
2772 | if (session->metadata_cache->data) { |
2773 | memcpy(tmp_cache_realloc, | |
2774 | session->metadata_cache->data, | |
2775 | session->metadata_cache->cache_alloc); | |
2776 | vfree(session->metadata_cache->data); | |
2777 | } | |
2778 | ||
d83004aa JD |
2779 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2780 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2781 | } |
d83004aa JD |
2782 | memcpy(session->metadata_cache->data + |
2783 | session->metadata_cache->metadata_written, | |
2784 | str, len); | |
2785 | session->metadata_cache->metadata_written += len; | |
c099397a | 2786 | kfree(str); |
d83004aa | 2787 | |
d83004aa JD |
2788 | return 0; |
2789 | ||
2790 | err: | |
2791 | kfree(str); | |
2792 | return -ENOMEM; | |
c099397a MD |
2793 | } |
2794 | ||
f513b2bf MD |
2795 | static |
2796 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2797 | { | |
2798 | size_t i; | |
2799 | ||
2800 | for (i = 0; i < nesting; i++) { | |
2801 | int ret; | |
2802 | ||
2803 | ret = lttng_metadata_printf(session, " "); | |
2804 | if (ret) { | |
2805 | return ret; | |
2806 | } | |
2807 | } | |
2808 | return 0; | |
2809 | } | |
2810 | ||
ceabb767 MD |
2811 | static |
2812 | int lttng_field_name_statedump(struct lttng_session *session, | |
2813 | const struct lttng_event_field *field, | |
2814 | size_t nesting) | |
2815 | { | |
2816 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2817 | } | |
2818 | ||
2819 | static | |
2820 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
2821 | const struct lttng_type *type, | |
2822 | size_t nesting) | |
2823 | { | |
2824 | int ret; | |
2825 | ||
2826 | WARN_ON_ONCE(type->atype != atype_integer); | |
2827 | ret = print_tabs(session, nesting); | |
2828 | if (ret) | |
2829 | return ret; | |
2830 | ret = lttng_metadata_printf(session, | |
2831 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
2832 | type->u.integer.size, | |
2833 | type->u.integer.alignment, | |
2834 | type->u.integer.signedness, | |
2835 | (type->u.integer.encoding == lttng_encode_none) | |
2836 | ? "none" | |
2837 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
2838 | ? "UTF8" | |
2839 | : "ASCII", | |
2840 | type->u.integer.base, | |
2841 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2842 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
2843 | #else | |
2844 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
2845 | #endif | |
2846 | ); | |
2847 | return ret; | |
2848 | } | |
2849 | ||
f513b2bf MD |
2850 | /* |
2851 | * Must be called with sessions_mutex held. | |
2852 | */ | |
2853 | static | |
2854 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
2855 | const struct lttng_type *type, | |
2856 | size_t nesting) | |
2857 | { | |
2858 | int ret; | |
2859 | uint32_t i, nr_fields; | |
ceabb767 MD |
2860 | unsigned int alignment; |
2861 | ||
2862 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
2863 | |
2864 | ret = print_tabs(session, nesting); | |
2865 | if (ret) | |
2866 | return ret; | |
2867 | ret = lttng_metadata_printf(session, | |
2868 | "struct {\n"); | |
2869 | if (ret) | |
2870 | return ret; | |
ceabb767 | 2871 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
2872 | for (i = 0; i < nr_fields; i++) { |
2873 | const struct lttng_event_field *iter_field; | |
2874 | ||
ceabb767 | 2875 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
2876 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2877 | if (ret) | |
2878 | return ret; | |
2879 | } | |
2880 | ret = print_tabs(session, nesting); | |
2881 | if (ret) | |
2882 | return ret; | |
ceabb767 MD |
2883 | alignment = type->u.struct_nestable.alignment; |
2884 | if (alignment) { | |
2885 | ret = lttng_metadata_printf(session, | |
2886 | "} align(%u)", | |
2887 | alignment); | |
2888 | } else { | |
2889 | ret = lttng_metadata_printf(session, | |
2890 | "}"); | |
2891 | } | |
f513b2bf MD |
2892 | return ret; |
2893 | } | |
2894 | ||
2895 | /* | |
2896 | * Must be called with sessions_mutex held. | |
2897 | */ | |
2898 | static | |
ceabb767 | 2899 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2900 | const struct lttng_event_field *field, |
2901 | size_t nesting) | |
2902 | { | |
2903 | int ret; | |
2904 | ||
2905 | ret = _lttng_struct_type_statedump(session, | |
2906 | &field->type, nesting); | |
2907 | if (ret) | |
2908 | return ret; | |
ceabb767 | 2909 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2910 | } |
2911 | ||
65c85aa6 MD |
2912 | /* |
2913 | * Must be called with sessions_mutex held. | |
2914 | */ | |
2915 | static | |
2916 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
2917 | const struct lttng_type *type, | |
2918 | size_t nesting) | |
2919 | { | |
2920 | int ret; | |
2921 | uint32_t i, nr_choices; | |
2922 | ||
ceabb767 MD |
2923 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
2924 | /* | |
2925 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
2926 | */ | |
2927 | if (type->u.variant_nestable.alignment != 0) | |
2928 | return -EINVAL; | |
65c85aa6 MD |
2929 | ret = print_tabs(session, nesting); |
2930 | if (ret) | |
2931 | return ret; | |
2932 | ret = lttng_metadata_printf(session, | |
2933 | "variant <_%s> {\n", | |
ceabb767 | 2934 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
2935 | if (ret) |
2936 | return ret; | |
ceabb767 | 2937 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
2938 | for (i = 0; i < nr_choices; i++) { |
2939 | const struct lttng_event_field *iter_field; | |
2940 | ||
ceabb767 | 2941 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
2942 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2943 | if (ret) | |
2944 | return ret; | |
2945 | } | |
2946 | ret = print_tabs(session, nesting); | |
2947 | if (ret) | |
2948 | return ret; | |
2949 | ret = lttng_metadata_printf(session, | |
2950 | "}"); | |
2951 | return ret; | |
2952 | } | |
2953 | ||
2954 | /* | |
2955 | * Must be called with sessions_mutex held. | |
2956 | */ | |
2957 | static | |
ceabb767 | 2958 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
2959 | const struct lttng_event_field *field, |
2960 | size_t nesting) | |
2961 | { | |
2962 | int ret; | |
2963 | ||
2964 | ret = _lttng_variant_type_statedump(session, | |
2965 | &field->type, nesting); | |
2966 | if (ret) | |
2967 | return ret; | |
ceabb767 | 2968 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
2969 | } |
2970 | ||
f513b2bf MD |
2971 | /* |
2972 | * Must be called with sessions_mutex held. | |
2973 | */ | |
2974 | static | |
ceabb767 | 2975 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2976 | const struct lttng_event_field *field, |
2977 | size_t nesting) | |
2978 | { | |
2979 | int ret; | |
2980 | const struct lttng_type *elem_type; | |
2981 | ||
ceabb767 MD |
2982 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
2983 | ||
2984 | if (field->type.u.array_nestable.alignment) { | |
2985 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2986 | if (ret) |
2987 | return ret; | |
ceabb767 MD |
2988 | ret = lttng_metadata_printf(session, |
2989 | "struct { } align(%u) _%s_padding;\n", | |
2990 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
2991 | field->name); | |
2992 | if (ret) | |
2993 | return ret; | |
2994 | } | |
2995 | /* | |
2996 | * Nested compound types: Only array of structures and variants are | |
2997 | * currently supported. | |
2998 | */ | |
2999 | elem_type = field->type.u.array_nestable.elem_type; | |
3000 | switch (elem_type->atype) { | |
3001 | case atype_integer: | |
3002 | case atype_struct_nestable: | |
3003 | case atype_variant_nestable: | |
3004 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
3005 | if (ret) |
3006 | return ret; | |
3007 | break; | |
ceabb767 | 3008 | |
f513b2bf MD |
3009 | default: |
3010 | return -EINVAL; | |
3011 | } | |
3012 | ret = lttng_metadata_printf(session, | |
3013 | " _%s[%u];\n", | |
3014 | field->name, | |
ceabb767 | 3015 | field->type.u.array_nestable.length); |
f513b2bf MD |
3016 | return ret; |
3017 | } | |
3018 | ||
3019 | /* | |
3020 | * Must be called with sessions_mutex held. | |
3021 | */ | |
3022 | static | |
ceabb767 | 3023 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3024 | const struct lttng_event_field *field, |
3025 | size_t nesting) | |
3026 | { | |
3027 | int ret; | |
3028 | const char *length_name; | |
3029 | const struct lttng_type *elem_type; | |
3030 | ||
ceabb767 | 3031 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 3032 | |
ceabb767 MD |
3033 | length_name = field->type.u.sequence_nestable.length_name; |
3034 | ||
3035 | if (field->type.u.sequence_nestable.alignment) { | |
3036 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3037 | if (ret) |
3038 | return ret; | |
ceabb767 MD |
3039 | ret = lttng_metadata_printf(session, |
3040 | "struct { } align(%u) _%s_padding;\n", | |
3041 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
3042 | field->name); | |
3043 | if (ret) | |
3044 | return ret; | |
3045 | } | |
3046 | ||
3047 | /* | |
3048 | * Nested compound types: Only array of structures and variants are | |
3049 | * currently supported. | |
3050 | */ | |
3051 | elem_type = field->type.u.sequence_nestable.elem_type; | |
3052 | switch (elem_type->atype) { | |
3053 | case atype_integer: | |
3054 | case atype_struct_nestable: | |
3055 | case atype_variant_nestable: | |
3056 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
3057 | if (ret) |
3058 | return ret; | |
3059 | break; | |
ceabb767 | 3060 | |
f513b2bf MD |
3061 | default: |
3062 | return -EINVAL; | |
3063 | } | |
3064 | ret = lttng_metadata_printf(session, | |
3065 | " _%s[ _%s ];\n", | |
3066 | field->name, | |
ceabb767 | 3067 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
3068 | return ret; |
3069 | } | |
3070 | ||
141ddf28 MD |
3071 | /* |
3072 | * Must be called with sessions_mutex held. | |
3073 | */ | |
3074 | static | |
ceabb767 MD |
3075 | int _lttng_enum_type_statedump(struct lttng_session *session, |
3076 | const struct lttng_type *type, | |
141ddf28 MD |
3077 | size_t nesting) |
3078 | { | |
3079 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 3080 | const struct lttng_type *container_type; |
141ddf28 MD |
3081 | int ret; |
3082 | unsigned int i, nr_entries; | |
3083 | ||
ceabb767 MD |
3084 | container_type = type->u.enum_nestable.container_type; |
3085 | if (container_type->atype != atype_integer) { | |
3086 | ret = -EINVAL; | |
3087 | goto end; | |
3088 | } | |
3089 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
3090 | nr_entries = enum_desc->nr_entries; |
3091 | ||
3092 | ret = print_tabs(session, nesting); | |
3093 | if (ret) | |
3094 | goto end; | |
ceabb767 MD |
3095 | ret = lttng_metadata_printf(session, "enum : "); |
3096 | if (ret) | |
3097 | goto end; | |
3098 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 3099 | if (ret) |
ceabb767 MD |
3100 | goto end; |
3101 | ret = lttng_metadata_printf(session, " {\n"); | |
3102 | if (ret) | |
3103 | goto end; | |
141ddf28 MD |
3104 | /* Dump all entries */ |
3105 | for (i = 0; i < nr_entries; i++) { | |
3106 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
3107 | int j, len; | |
3108 | ||
3109 | ret = print_tabs(session, nesting + 1); | |
3110 | if (ret) | |
3111 | goto end; | |
3112 | ret = lttng_metadata_printf(session, | |
3113 | "\""); | |
3114 | if (ret) | |
3115 | goto end; | |
3116 | len = strlen(entry->string); | |
3117 | /* Escape the character '"' */ | |
3118 | for (j = 0; j < len; j++) { | |
3119 | char c = entry->string[j]; | |
3120 | ||
3121 | switch (c) { | |
3122 | case '"': | |
3123 | ret = lttng_metadata_printf(session, | |
3124 | "\\\""); | |
3125 | break; | |
3126 | case '\\': | |
3127 | ret = lttng_metadata_printf(session, | |
3128 | "\\\\"); | |
3129 | break; | |
3130 | default: | |
3131 | ret = lttng_metadata_printf(session, | |
3132 | "%c", c); | |
3133 | break; | |
3134 | } | |
3135 | if (ret) | |
3136 | goto end; | |
3137 | } | |
08ad1061 PP |
3138 | ret = lttng_metadata_printf(session, "\""); |
3139 | if (ret) | |
3140 | goto end; | |
3141 | ||
3142 | if (entry->options.is_auto) { | |
3143 | ret = lttng_metadata_printf(session, ",\n"); | |
3144 | if (ret) | |
3145 | goto end; | |
141ddf28 | 3146 | } else { |
7c559490 MD |
3147 | ret = lttng_metadata_printf(session, |
3148 | " = "); | |
3149 | if (ret) | |
3150 | goto end; | |
3151 | if (entry->start.signedness) | |
141ddf28 | 3152 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3153 | "%lld", (long long) entry->start.value); |
3154 | else | |
3155 | ret = lttng_metadata_printf(session, | |
3156 | "%llu", entry->start.value); | |
3157 | if (ret) | |
3158 | goto end; | |
3159 | if (entry->start.signedness == entry->end.signedness && | |
3160 | entry->start.value | |
3161 | == entry->end.value) { | |
141ddf28 | 3162 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3163 | ",\n"); |
3164 | } else { | |
3165 | if (entry->end.signedness) { | |
3166 | ret = lttng_metadata_printf(session, | |
3167 | " ... %lld,\n", | |
3168 | (long long) entry->end.value); | |
3169 | } else { | |
3170 | ret = lttng_metadata_printf(session, | |
3171 | " ... %llu,\n", | |
3172 | entry->end.value); | |
3173 | } | |
141ddf28 | 3174 | } |
7c559490 MD |
3175 | if (ret) |
3176 | goto end; | |
141ddf28 | 3177 | } |
141ddf28 MD |
3178 | } |
3179 | ret = print_tabs(session, nesting); | |
3180 | if (ret) | |
3181 | goto end; | |
ceabb767 | 3182 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3183 | end: |
3184 | return ret; | |
3185 | } | |
3186 | ||
d83004aa JD |
3187 | /* |
3188 | * Must be called with sessions_mutex held. | |
3189 | */ | |
c099397a | 3190 | static |
ceabb767 MD |
3191 | int _lttng_enum_field_statedump(struct lttng_session *session, |
3192 | const struct lttng_event_field *field, | |
3193 | size_t nesting) | |
3194 | { | |
3195 | int ret; | |
3196 | ||
3197 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
3198 | if (ret) | |
3199 | return ret; | |
3200 | return lttng_field_name_statedump(session, field, nesting); | |
3201 | } | |
3202 | ||
3203 | static | |
3204 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
3205 | const struct lttng_event_field *field, | |
3206 | size_t nesting) | |
3207 | { | |
3208 | int ret; | |
3209 | ||
3210 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
3211 | if (ret) | |
3212 | return ret; | |
3213 | return lttng_field_name_statedump(session, field, nesting); | |
3214 | } | |
3215 | ||
3216 | static | |
3217 | int _lttng_string_type_statedump(struct lttng_session *session, | |
3218 | const struct lttng_type *type, | |
3219 | size_t nesting) | |
3220 | { | |
3221 | int ret; | |
3222 | ||
3223 | WARN_ON_ONCE(type->atype != atype_string); | |
3224 | /* Default encoding is UTF8 */ | |
3225 | ret = print_tabs(session, nesting); | |
3226 | if (ret) | |
3227 | return ret; | |
3228 | ret = lttng_metadata_printf(session, | |
3229 | "string%s", | |
3230 | type->u.string.encoding == lttng_encode_ASCII ? | |
3231 | " { encoding = ASCII; }" : ""); | |
3232 | return ret; | |
3233 | } | |
3234 | ||
3235 | static | |
3236 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
3237 | const struct lttng_event_field *field, |
3238 | size_t nesting) | |
ceabb767 MD |
3239 | { |
3240 | int ret; | |
3241 | ||
3242 | WARN_ON_ONCE(field->type.atype != atype_string); | |
3243 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
3244 | if (ret) | |
3245 | return ret; | |
3246 | return lttng_field_name_statedump(session, field, nesting); | |
3247 | } | |
3248 | ||
3249 | /* | |
3250 | * Must be called with sessions_mutex held. | |
3251 | */ | |
3252 | static | |
3253 | int _lttng_type_statedump(struct lttng_session *session, | |
3254 | const struct lttng_type *type, | |
3255 | size_t nesting) | |
c099397a | 3256 | { |
c099397a | 3257 | int ret = 0; |
c099397a | 3258 | |
ceabb767 | 3259 | switch (type->atype) { |
8070f5c0 | 3260 | case atype_integer: |
ceabb767 | 3261 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 3262 | break; |
ceabb767 MD |
3263 | case atype_enum_nestable: |
3264 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 3265 | break; |
ceabb767 MD |
3266 | case atype_string: |
3267 | ret = _lttng_string_type_statedump(session, type, nesting); | |
3268 | break; | |
3269 | case atype_struct_nestable: | |
3270 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 3271 | break; |
ceabb767 MD |
3272 | case atype_variant_nestable: |
3273 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
3274 | break; | |
3275 | ||
3276 | /* Nested arrays and sequences are not supported yet. */ | |
3277 | case atype_array_nestable: | |
3278 | case atype_sequence_nestable: | |
3279 | default: | |
3280 | WARN_ON_ONCE(1); | |
3281 | return -EINVAL; | |
8070f5c0 | 3282 | } |
ceabb767 MD |
3283 | return ret; |
3284 | } | |
8070f5c0 | 3285 | |
ceabb767 MD |
3286 | /* |
3287 | * Must be called with sessions_mutex held. | |
3288 | */ | |
3289 | static | |
3290 | int _lttng_field_statedump(struct lttng_session *session, | |
3291 | const struct lttng_event_field *field, | |
3292 | size_t nesting) | |
3293 | { | |
3294 | int ret = 0; | |
27d2368e | 3295 | |
ceabb767 MD |
3296 | switch (field->type.atype) { |
3297 | case atype_integer: | |
3298 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
3299 | break; | |
3300 | case atype_enum_nestable: | |
3301 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 3302 | break; |
8070f5c0 | 3303 | case atype_string: |
ceabb767 | 3304 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3305 | break; |
ceabb767 MD |
3306 | case atype_struct_nestable: |
3307 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 3308 | break; |
ceabb767 MD |
3309 | case atype_array_nestable: |
3310 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 3311 | break; |
ceabb767 MD |
3312 | case atype_sequence_nestable: |
3313 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 3314 | break; |
ceabb767 MD |
3315 | case atype_variant_nestable: |
3316 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 3317 | break; |
f513b2bf | 3318 | |
8070f5c0 MD |
3319 | default: |
3320 | WARN_ON_ONCE(1); | |
3321 | return -EINVAL; | |
3322 | } | |
3323 | return ret; | |
3324 | } | |
3325 | ||
3326 | static | |
a90917c3 | 3327 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
3328 | struct lttng_ctx *ctx) |
3329 | { | |
3330 | int ret = 0; | |
3331 | int i; | |
3332 | ||
3333 | if (!ctx) | |
3334 | return 0; | |
3335 | for (i = 0; i < ctx->nr_fields; i++) { | |
3336 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
3337 | ||
f513b2bf | 3338 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
3339 | if (ret) |
3340 | return ret; | |
3341 | } | |
3342 | return ret; | |
3343 | } | |
3344 | ||
3345 | static | |
a90917c3 MD |
3346 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
3347 | struct lttng_event *event) | |
8070f5c0 MD |
3348 | { |
3349 | const struct lttng_event_desc *desc = event->desc; | |
3350 | int ret = 0; | |
3351 | int i; | |
3352 | ||
3353 | for (i = 0; i < desc->nr_fields; i++) { | |
3354 | const struct lttng_event_field *field = &desc->fields[i]; | |
3355 | ||
f513b2bf | 3356 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3357 | if (ret) |
3358 | return ret; | |
c099397a MD |
3359 | } |
3360 | return ret; | |
3361 | } | |
3362 | ||
d83004aa JD |
3363 | /* |
3364 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3365 | * The entire event metadata is printed as a single atomic metadata |
3366 | * transaction. | |
d83004aa | 3367 | */ |
c099397a | 3368 | static |
a90917c3 MD |
3369 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3370 | struct lttng_channel *chan, | |
3371 | struct lttng_event *event) | |
c099397a MD |
3372 | { |
3373 | int ret = 0; | |
3374 | ||
585e5dcc | 3375 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3376 | return 0; |
d83004aa | 3377 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3378 | return 0; |
3379 | ||
8b97fd42 MD |
3380 | lttng_metadata_begin(session); |
3381 | ||
c099397a MD |
3382 | ret = lttng_metadata_printf(session, |
3383 | "event {\n" | |
ae734547 | 3384 | " name = \"%s\";\n" |
c099397a | 3385 | " id = %u;\n" |
b9074a1b | 3386 | " stream_id = %u;\n", |
c099397a MD |
3387 | event->desc->name, |
3388 | event->id, | |
3389 | event->chan->id); | |
3390 | if (ret) | |
3391 | goto end; | |
3392 | ||
b9074a1b MD |
3393 | if (event->ctx) { |
3394 | ret = lttng_metadata_printf(session, | |
3395 | " context := struct {\n"); | |
3396 | if (ret) | |
3397 | goto end; | |
3398 | } | |
a90917c3 | 3399 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
3400 | if (ret) |
3401 | goto end; | |
b9074a1b MD |
3402 | if (event->ctx) { |
3403 | ret = lttng_metadata_printf(session, | |
3404 | " };\n"); | |
3405 | if (ret) | |
3406 | goto end; | |
3407 | } | |
8070f5c0 MD |
3408 | |
3409 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
3410 | " fields := struct {\n" |
3411 | ); | |
3412 | if (ret) | |
3413 | goto end; | |
3414 | ||
a90917c3 | 3415 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
3416 | if (ret) |
3417 | goto end; | |
3418 | ||
3419 | /* | |
3420 | * LTTng space reservation can only reserve multiples of the | |
3421 | * byte size. | |
3422 | */ | |
3423 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3424 | " };\n" |
3425 | "};\n\n"); | |
c099397a MD |
3426 | if (ret) |
3427 | goto end; | |
3428 | ||
c099397a MD |
3429 | event->metadata_dumped = 1; |
3430 | end: | |
8b97fd42 | 3431 | lttng_metadata_end(session); |
c099397a MD |
3432 | return ret; |
3433 | ||
3434 | } | |
3435 | ||
d83004aa JD |
3436 | /* |
3437 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3438 | * The entire channel metadata is printed as a single atomic metadata |
3439 | * transaction. | |
d83004aa | 3440 | */ |
c099397a | 3441 | static |
a90917c3 MD |
3442 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3443 | struct lttng_channel *chan) | |
c099397a MD |
3444 | { |
3445 | int ret = 0; | |
3446 | ||
585e5dcc | 3447 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3448 | return 0; |
d83004aa JD |
3449 | |
3450 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3451 | return 0; |
3452 | ||
8b97fd42 MD |
3453 | lttng_metadata_begin(session); |
3454 | ||
c099397a MD |
3455 | WARN_ON_ONCE(!chan->header_type); |
3456 | ret = lttng_metadata_printf(session, | |
3457 | "stream {\n" | |
3458 | " id = %u;\n" | |
9115fbdc | 3459 | " event.header := %s;\n" |
b9074a1b | 3460 | " packet.context := struct packet_context;\n", |
c099397a MD |
3461 | chan->id, |
3462 | chan->header_type == 1 ? "struct event_header_compact" : | |
3463 | "struct event_header_large"); | |
3464 | if (ret) | |
3465 | goto end; | |
3466 | ||
b9074a1b MD |
3467 | if (chan->ctx) { |
3468 | ret = lttng_metadata_printf(session, | |
3469 | " event.context := struct {\n"); | |
3470 | if (ret) | |
3471 | goto end; | |
3472 | } | |
a90917c3 | 3473 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3474 | if (ret) |
3475 | goto end; | |
b9074a1b MD |
3476 | if (chan->ctx) { |
3477 | ret = lttng_metadata_printf(session, | |
3478 | " };\n"); | |
3479 | if (ret) | |
3480 | goto end; | |
3481 | } | |
8070f5c0 MD |
3482 | |
3483 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3484 | "};\n\n"); |
8070f5c0 | 3485 | |
c099397a MD |
3486 | chan->metadata_dumped = 1; |
3487 | end: | |
8b97fd42 | 3488 | lttng_metadata_end(session); |
c099397a MD |
3489 | return ret; |
3490 | } | |
3491 | ||
d83004aa JD |
3492 | /* |
3493 | * Must be called with sessions_mutex held. | |
3494 | */ | |
9115fbdc | 3495 | static |
a90917c3 | 3496 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3497 | { |
3498 | return lttng_metadata_printf(session, | |
3499 | "struct packet_context {\n" | |
a3ccff4f MD |
3500 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3501 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3502 | " uint64_t content_size;\n" |
3503 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3504 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3505 | " unsigned long events_discarded;\n" |
9115fbdc | 3506 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3507 | "};\n\n" |
9115fbdc MD |
3508 | ); |
3509 | } | |
3510 | ||
3511 | /* | |
3512 | * Compact header: | |
3513 | * id: range: 0 - 30. | |
3514 | * id 31 is reserved to indicate an extended header. | |
3515 | * | |
3516 | * Large header: | |
3517 | * id: range: 0 - 65534. | |
3518 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3519 | * |
3520 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3521 | */ |
3522 | static | |
a90917c3 | 3523 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3524 | { |
3525 | return lttng_metadata_printf(session, | |
3526 | "struct event_header_compact {\n" | |
3527 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3528 | " variant <id> {\n" | |
3529 | " struct {\n" | |
a3ccff4f | 3530 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3531 | " } compact;\n" |
3532 | " struct {\n" | |
3533 | " uint32_t id;\n" | |
a3ccff4f | 3534 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3535 | " } extended;\n" |
3536 | " } v;\n" | |
3537 | "} align(%u);\n" | |
3538 | "\n" | |
3539 | "struct event_header_large {\n" | |
3540 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3541 | " variant <id> {\n" | |
3542 | " struct {\n" | |
a3ccff4f | 3543 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3544 | " } compact;\n" |
3545 | " struct {\n" | |
3546 | " uint32_t id;\n" | |
a3ccff4f | 3547 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3548 | " } extended;\n" |
3549 | " } v;\n" | |
3550 | "} align(%u);\n\n", | |
a90917c3 MD |
3551 | lttng_alignof(uint32_t) * CHAR_BIT, |
3552 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3553 | ); |
3554 | } | |
3555 | ||
a3ccff4f MD |
3556 | /* |
3557 | * Approximation of NTP time of day to clock monotonic correlation, | |
3558 | * taken at start of trace. | |
3559 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3560 | * in future versions. | |
5283350b MD |
3561 | * This function may return a negative offset. It may happen if the |
3562 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3563 | * |
3564 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3565 | * y2038 compliant. | |
a3ccff4f MD |
3566 | */ |
3567 | static | |
8967b2a3 | 3568 | int64_t measure_clock_offset(void) |
a3ccff4f | 3569 | { |
dcb93448 | 3570 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3571 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3572 | int64_t offset; |
a3ccff4f | 3573 | unsigned long flags; |
3636085f MJ |
3574 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3575 | struct timespec64 rts = { 0, 0 }; | |
3576 | #else | |
3577 | struct timespec rts = { 0, 0 }; | |
3578 | #endif | |
a3ccff4f MD |
3579 | |
3580 | /* Disable interrupts to increase correlation precision. */ | |
3581 | local_irq_save(flags); | |
3582 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3583 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3584 | ktime_get_real_ts64(&rts); | |
3585 | #else | |
216b6baa | 3586 | getnstimeofday(&rts); |
3636085f | 3587 | #endif |
a3ccff4f MD |
3588 | monotonic[1] = trace_clock_read64(); |
3589 | local_irq_restore(flags); | |
3590 | ||
dcb93448 | 3591 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3592 | realtime = (uint64_t) rts.tv_sec * tcf; |
3593 | if (tcf == NSEC_PER_SEC) { | |
3594 | realtime += rts.tv_nsec; | |
3595 | } else { | |
3596 | uint64_t n = rts.tv_nsec * tcf; | |
3597 | ||
3598 | do_div(n, NSEC_PER_SEC); | |
3599 | realtime += n; | |
3600 | } | |
dcb93448 | 3601 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3602 | return offset; |
3603 | } | |
3604 | ||
3eb95be4 JR |
3605 | static |
3606 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3607 | { | |
0f3eaad4 | 3608 | int ret = 0; |
3eb95be4 JR |
3609 | size_t i; |
3610 | char cur; | |
3611 | ||
3612 | i = 0; | |
3613 | cur = string[i]; | |
3614 | while (cur != '\0') { | |
3615 | switch (cur) { | |
3616 | case '\n': | |
3617 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3618 | break; | |
3619 | case '\\': | |
3620 | case '"': | |
3621 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3622 | if (ret) | |
3623 | goto error; | |
3624 | /* We still print the current char */ | |
3625 | /* Fallthrough */ | |
3626 | default: | |
3627 | ret = lttng_metadata_printf(session, "%c", cur); | |
3628 | break; | |
3629 | } | |
3630 | ||
3631 | if (ret) | |
3632 | goto error; | |
3633 | ||
3634 | cur = string[++i]; | |
3635 | } | |
3636 | error: | |
3637 | return ret; | |
3638 | } | |
3639 | ||
3640 | static | |
1c88f269 JR |
3641 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3642 | const char *field_value) | |
3eb95be4 JR |
3643 | { |
3644 | int ret; | |
3645 | ||
1c88f269 | 3646 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3647 | if (ret) |
3648 | goto error; | |
3649 | ||
1c88f269 | 3650 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3651 | if (ret) |
3652 | goto error; | |
3653 | ||
3654 | ret = lttng_metadata_printf(session, "\";\n"); | |
3655 | ||
3656 | error: | |
3657 | return ret; | |
3658 | } | |
3659 | ||
c099397a MD |
3660 | /* |
3661 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3662 | * Must be called with sessions_mutex held. |
c099397a MD |
3663 | */ |
3664 | static | |
a90917c3 | 3665 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3666 | { |
30bdb6e4 | 3667 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3668 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3669 | const char *product_uuid; |
a90917c3 MD |
3670 | struct lttng_channel *chan; |
3671 | struct lttng_event *event; | |
c099397a MD |
3672 | int ret = 0; |
3673 | ||
585e5dcc | 3674 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3675 | return 0; |
8b97fd42 MD |
3676 | |
3677 | lttng_metadata_begin(session); | |
3678 | ||
c099397a MD |
3679 | if (session->metadata_dumped) |
3680 | goto skip_session; | |
c099397a | 3681 | |
d793d5e1 | 3682 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3683 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3684 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3685 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3686 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3687 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3688 | |
3689 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3690 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3691 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3692 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3693 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3694 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3695 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3696 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3697 | "\n" |
3698 | "trace {\n" | |
3699 | " major = %u;\n" | |
3700 | " minor = %u;\n" | |
30bdb6e4 | 3701 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3702 | " byte_order = %s;\n" |
3703 | " packet.header := struct {\n" | |
3704 | " uint32_t magic;\n" | |
1ec3f75a | 3705 | " uint8_t uuid[16];\n" |
d793d5e1 | 3706 | " uint32_t stream_id;\n" |
5594698f | 3707 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3708 | " };\n" |
d793d5e1 | 3709 | "};\n\n", |
a90917c3 MD |
3710 | lttng_alignof(uint8_t) * CHAR_BIT, |
3711 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3712 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3713 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3714 | sizeof(unsigned long) * CHAR_BIT, |
3715 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3716 | CTF_SPEC_MAJOR, |
3717 | CTF_SPEC_MINOR, | |
d793d5e1 | 3718 | uuid_s, |
5214fa50 | 3719 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3720 | "be" |
3721 | #else | |
3722 | "le" | |
3723 | #endif | |
3724 | ); | |
3725 | if (ret) | |
3726 | goto end; | |
3727 | ||
99dc9597 MD |
3728 | ret = lttng_metadata_printf(session, |
3729 | "env {\n" | |
a6058143 | 3730 | " hostname = \"%s\";\n" |
c6c9e10f | 3731 | " domain = \"kernel\";\n" |
99dc9597 | 3732 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3733 | " kernel_release = \"%s\";\n" |
3734 | " kernel_version = \"%s\";\n" | |
3735 | " tracer_name = \"lttng-modules\";\n" | |
3736 | " tracer_major = %d;\n" | |
3737 | " tracer_minor = %d;\n" | |
3738 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3739 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3740 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3741 | utsname()->sysname, |
3742 | utsname()->release, | |
c6c9e10f MD |
3743 | utsname()->version, |
3744 | LTTNG_MODULES_MAJOR_VERSION, | |
3745 | LTTNG_MODULES_MINOR_VERSION, | |
3746 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3747 | ); |
3748 | if (ret) | |
3749 | goto end; | |
3750 | ||
1c88f269 JR |
3751 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3752 | if (ret) | |
3753 | goto end; | |
3754 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3755 | session->creation_time); | |
3eb95be4 JR |
3756 | if (ret) |
3757 | goto end; | |
3758 | ||
c88f762e GB |
3759 | /* Add the product UUID to the 'env' section */ |
3760 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3761 | if (product_uuid) { | |
3762 | ret = lttng_metadata_printf(session, | |
3763 | " product_uuid = \"%s\";\n", | |
3764 | product_uuid | |
3765 | ); | |
3766 | if (ret) | |
3767 | goto end; | |
3768 | } | |
3769 | ||
3770 | /* Close the 'env' section */ | |
3eb95be4 JR |
3771 | ret = lttng_metadata_printf(session, "};\n\n"); |
3772 | if (ret) | |
3773 | goto end; | |
3774 | ||
a3ccff4f MD |
3775 | ret = lttng_metadata_printf(session, |
3776 | "clock {\n" | |
2754583e MD |
3777 | " name = \"%s\";\n", |
3778 | trace_clock_name() | |
a82c63f1 MD |
3779 | ); |
3780 | if (ret) | |
3781 | goto end; | |
3782 | ||
3783 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3784 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3785 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3786 | clock_uuid_s |
3787 | ); | |
3788 | if (ret) | |
3789 | goto end; | |
3790 | } | |
3791 | ||
3792 | ret = lttng_metadata_printf(session, | |
2754583e | 3793 | " description = \"%s\";\n" |
a3ccff4f MD |
3794 | " freq = %llu; /* Frequency, in Hz */\n" |
3795 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3796 | " offset = %lld;\n" |
a3ccff4f | 3797 | "};\n\n", |
2754583e | 3798 | trace_clock_description(), |
a3ccff4f | 3799 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3800 | (long long) measure_clock_offset() |
a3ccff4f MD |
3801 | ); |
3802 | if (ret) | |
3803 | goto end; | |
3804 | ||
3805 | ret = lttng_metadata_printf(session, | |
3806 | "typealias integer {\n" | |
3807 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3808 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3809 | "} := uint27_clock_monotonic_t;\n" |
3810 | "\n" | |
3811 | "typealias integer {\n" | |
3812 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3813 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3814 | "} := uint32_clock_monotonic_t;\n" |
3815 | "\n" | |
3816 | "typealias integer {\n" | |
3817 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3818 | " map = clock.%s.value;\n" |
a3ccff4f | 3819 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3820 | trace_clock_name(), |
a3ccff4f | 3821 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3822 | trace_clock_name(), |
3823 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3824 | trace_clock_name() | |
a3ccff4f MD |
3825 | ); |
3826 | if (ret) | |
3827 | goto end; | |
3828 | ||
a90917c3 | 3829 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3830 | if (ret) |
3831 | goto end; | |
3832 | ||
a90917c3 | 3833 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3834 | if (ret) |
3835 | goto end; | |
3836 | ||
c099397a MD |
3837 | skip_session: |
3838 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 3839 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
3840 | if (ret) |
3841 | goto end; | |
3842 | } | |
3843 | ||
3844 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 3845 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
3846 | if (ret) |
3847 | goto end; | |
3848 | } | |
3849 | session->metadata_dumped = 1; | |
3850 | end: | |
8b97fd42 | 3851 | lttng_metadata_end(session); |
c099397a MD |
3852 | return ret; |
3853 | } | |
3854 | ||
c0e31d2e | 3855 | /** |
a90917c3 | 3856 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3857 | * @transport: transport structure |
3858 | * | |
3859 | * Registers a transport which can be used as output to extract the data out of | |
3860 | * LTTng. The module calling this registration function must ensure that no | |
3861 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3862 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3863 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3864 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3865 | * after its registration must it synchronize the TLBs. |
3866 | */ | |
a90917c3 | 3867 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3868 | { |
3869 | /* | |
3870 | * Make sure no page fault can be triggered by the module about to be | |
3871 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3872 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3873 | */ |
263b6c88 | 3874 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3875 | |
3876 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3877 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3878 | mutex_unlock(&sessions_mutex); |
3879 | } | |
a90917c3 | 3880 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3881 | |
3882 | /** | |
a90917c3 | 3883 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
3884 | * @transport: transport structure |
3885 | */ | |
a90917c3 | 3886 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
3887 | { |
3888 | mutex_lock(&sessions_mutex); | |
3889 | list_del(&transport->node); | |
3890 | mutex_unlock(&sessions_mutex); | |
3891 | } | |
a90917c3 | 3892 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 3893 | |
a101fa10 MD |
3894 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
3895 | { | |
3896 | /* | |
3897 | * Make sure no page fault can be triggered by the module about to be | |
3898 | * registered. We deal with this here so we don't have to call | |
3899 | * vmalloc_sync_mappings() in each module's init. | |
3900 | */ | |
3901 | wrapper_vmalloc_sync_mappings(); | |
3902 | ||
3903 | mutex_lock(&sessions_mutex); | |
3904 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
3905 | mutex_unlock(&sessions_mutex); | |
3906 | } | |
3907 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
3908 | ||
3909 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
3910 | { | |
3911 | mutex_lock(&sessions_mutex); | |
3912 | list_del(&transport->node); | |
3913 | mutex_unlock(&sessions_mutex); | |
3914 | } | |
3915 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
3916 | ||
894ce5dc | 3917 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
3918 | |
3919 | enum cpuhp_state lttng_hp_prepare; | |
3920 | enum cpuhp_state lttng_hp_online; | |
3921 | ||
3922 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
3923 | { | |
3924 | struct lttng_cpuhp_node *lttng_node; | |
3925 | ||
3926 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3927 | switch (lttng_node->component) { | |
3928 | case LTTNG_RING_BUFFER_FRONTEND: | |
3929 | return 0; | |
3930 | case LTTNG_RING_BUFFER_BACKEND: | |
3931 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
3932 | case LTTNG_RING_BUFFER_ITER: | |
3933 | return 0; | |
3934 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3935 | return 0; | |
3936 | default: | |
3937 | return -EINVAL; | |
3938 | } | |
3939 | } | |
3940 | ||
3941 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
3942 | { | |
3943 | struct lttng_cpuhp_node *lttng_node; | |
3944 | ||
3945 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3946 | switch (lttng_node->component) { | |
3947 | case LTTNG_RING_BUFFER_FRONTEND: | |
3948 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
3949 | case LTTNG_RING_BUFFER_BACKEND: | |
3950 | return 0; | |
3951 | case LTTNG_RING_BUFFER_ITER: | |
3952 | return 0; | |
3953 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3954 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
3955 | default: | |
3956 | return -EINVAL; | |
3957 | } | |
3958 | } | |
3959 | ||
3960 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
3961 | { | |
3962 | struct lttng_cpuhp_node *lttng_node; | |
3963 | ||
3964 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3965 | switch (lttng_node->component) { | |
3966 | case LTTNG_RING_BUFFER_FRONTEND: | |
3967 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
3968 | case LTTNG_RING_BUFFER_BACKEND: | |
3969 | return 0; | |
3970 | case LTTNG_RING_BUFFER_ITER: | |
3971 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
3972 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3973 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
3974 | default: | |
3975 | return -EINVAL; | |
3976 | } | |
3977 | } | |
3978 | ||
3979 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
3980 | { | |
3981 | struct lttng_cpuhp_node *lttng_node; | |
3982 | ||
3983 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3984 | switch (lttng_node->component) { | |
3985 | case LTTNG_RING_BUFFER_FRONTEND: | |
3986 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
3987 | case LTTNG_RING_BUFFER_BACKEND: | |
3988 | return 0; | |
3989 | case LTTNG_RING_BUFFER_ITER: | |
3990 | return 0; | |
3991 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3992 | return 0; | |
3993 | default: | |
3994 | return -EINVAL; | |
3995 | } | |
3996 | } | |
3997 | ||
3998 | static int __init lttng_init_cpu_hotplug(void) | |
3999 | { | |
4000 | int ret; | |
4001 | ||
4002 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4003 | lttng_hotplug_prepare, | |
4004 | lttng_hotplug_dead); | |
4005 | if (ret < 0) { | |
4006 | return ret; | |
4007 | } | |
4008 | lttng_hp_prepare = ret; | |
4009 | lttng_rb_set_hp_prepare(ret); | |
4010 | ||
4011 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4012 | lttng_hotplug_online, | |
4013 | lttng_hotplug_offline); | |
4014 | if (ret < 0) { | |
4015 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4016 | lttng_hp_prepare = 0; | |
4017 | return ret; | |
4018 | } | |
4019 | lttng_hp_online = ret; | |
4020 | lttng_rb_set_hp_online(ret); | |
4021 | ||
4022 | return 0; | |
4023 | } | |
4024 | ||
4025 | static void __exit lttng_exit_cpu_hotplug(void) | |
4026 | { | |
4027 | lttng_rb_set_hp_online(0); | |
4028 | cpuhp_remove_multi_state(lttng_hp_online); | |
4029 | lttng_rb_set_hp_prepare(0); | |
4030 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4031 | } | |
4032 | ||
1ee63d8d | 4033 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4034 | static int lttng_init_cpu_hotplug(void) |
4035 | { | |
4036 | return 0; | |
4037 | } | |
4038 | static void lttng_exit_cpu_hotplug(void) | |
4039 | { | |
4040 | } | |
1ee63d8d | 4041 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4042 | |
4043 | ||
a90917c3 | 4044 | static int __init lttng_events_init(void) |
4e3c1b9b | 4045 | { |
1c25284c MD |
4046 | int ret; |
4047 | ||
453b2495 JD |
4048 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4049 | if (ret) | |
4050 | return ret; | |
389d7070 | 4051 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4052 | if (ret) |
4053 | return ret; | |
4054 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4055 | if (ret) |
4056 | return ret; | |
4057 | ret = lttng_probes_init(); | |
389d7070 MD |
4058 | if (ret) |
4059 | return ret; | |
07dfc1d0 | 4060 | ret = lttng_context_init(); |
20591cf7 MD |
4061 | if (ret) |
4062 | return ret; | |
07dfc1d0 MD |
4063 | ret = lttng_tracepoint_init(); |
4064 | if (ret) | |
4065 | goto error_tp; | |
a90917c3 | 4066 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
4067 | if (!event_cache) { |
4068 | ret = -ENOMEM; | |
dffef45d FD |
4069 | goto error_kmem_event; |
4070 | } | |
4071 | event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0); | |
4072 | if (!event_notifier_cache) { | |
4073 | ret = -ENOMEM; | |
4074 | goto error_kmem_event_notifier; | |
20591cf7 | 4075 | } |
80996790 | 4076 | ret = lttng_abi_init(); |
02119ee5 MD |
4077 | if (ret) |
4078 | goto error_abi; | |
0c956676 MD |
4079 | ret = lttng_logger_init(); |
4080 | if (ret) | |
4081 | goto error_logger; | |
1e367326 MD |
4082 | ret = lttng_init_cpu_hotplug(); |
4083 | if (ret) | |
4084 | goto error_hotplug; | |
101215b7 | 4085 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4086 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4087 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4088 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4089 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4090 | LTTNG_VERSION_NAME, |
4091 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4092 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4093 | #else | |
4094 | "", | |
4095 | #endif | |
4096 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4097 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4098 | #else | |
4099 | ""); | |
4100 | #endif | |
4e3c1b9b | 4101 | return 0; |
0c956676 | 4102 | |
1e367326 MD |
4103 | error_hotplug: |
4104 | lttng_logger_exit(); | |
0c956676 MD |
4105 | error_logger: |
4106 | lttng_abi_exit(); | |
02119ee5 | 4107 | error_abi: |
dffef45d FD |
4108 | kmem_cache_destroy(event_notifier_cache); |
4109 | error_kmem_event_notifier: | |
1c25284c | 4110 | kmem_cache_destroy(event_cache); |
dffef45d | 4111 | error_kmem_event: |
20591cf7 | 4112 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4113 | error_tp: |
4114 | lttng_context_exit(); | |
101215b7 | 4115 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4116 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4117 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4118 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4119 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4120 | LTTNG_VERSION_NAME, |
4121 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4122 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4123 | #else | |
4124 | "", | |
4125 | #endif | |
4126 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4127 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4128 | #else | |
4129 | ""); | |
4130 | #endif | |
1c25284c | 4131 | return ret; |
4e3c1b9b MD |
4132 | } |
4133 | ||
a90917c3 | 4134 | module_init(lttng_events_init); |
11b5a3c2 | 4135 | |
a90917c3 | 4136 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4137 | { |
a90917c3 | 4138 | struct lttng_session *session, *tmpsession; |
92e94819 | 4139 | |
1e367326 | 4140 | lttng_exit_cpu_hotplug(); |
0c956676 | 4141 | lttng_logger_exit(); |
80996790 | 4142 | lttng_abi_exit(); |
92e94819 | 4143 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4144 | lttng_session_destroy(session); |
11b5a3c2 | 4145 | kmem_cache_destroy(event_cache); |
dffef45d | 4146 | kmem_cache_destroy(event_notifier_cache); |
20591cf7 | 4147 | lttng_tracepoint_exit(); |
07dfc1d0 | 4148 | lttng_context_exit(); |
101215b7 | 4149 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4150 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4151 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4152 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4153 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4154 | LTTNG_VERSION_NAME, |
4155 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4156 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4157 | #else | |
4158 | "", | |
4159 | #endif | |
4160 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4161 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4162 | #else | |
4163 | ""); | |
4164 | #endif | |
4e3c1b9b | 4165 | } |
92e94819 | 4166 | |
a90917c3 | 4167 | module_exit(lttng_events_exit); |
11b5a3c2 | 4168 | |
7ca11e77 | 4169 | #include <generated/patches.h> |
101215b7 MJ |
4170 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4171 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4172 | #endif | |
4173 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4174 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4175 | #endif | |
92e94819 MD |
4176 | MODULE_LICENSE("GPL and additional rights"); |
4177 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4178 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4179 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4180 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4181 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4182 | LTTNG_MODULES_EXTRAVERSION); |