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); |
d83004aa JD |
55 | /* |
56 | * Protect the sessions and metadata caches. | |
57 | */ | |
4e3c1b9b MD |
58 | static DEFINE_MUTEX(sessions_mutex); |
59 | static struct kmem_cache *event_cache; | |
dffef45d | 60 | static struct kmem_cache *event_notifier_cache; |
4e3c1b9b | 61 | |
b2bc0bc8 FD |
62 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
63 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
64 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
dffef45d | 65 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 66 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 67 | |
a90917c3 | 68 | static void _lttng_event_destroy(struct lttng_event *event); |
dffef45d | 69 | static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier); |
a90917c3 MD |
70 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
71 | static int _lttng_event_unregister(struct lttng_event *event); | |
dffef45d | 72 | static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier); |
c099397a | 73 | static |
a90917c3 MD |
74 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
75 | struct lttng_channel *chan, | |
76 | struct lttng_event *event); | |
c099397a | 77 | static |
a90917c3 | 78 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
79 | static |
80 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 81 | static |
ceabb767 MD |
82 | int _lttng_type_statedump(struct lttng_session *session, |
83 | const struct lttng_type *type, | |
84 | size_t nesting); | |
85 | static | |
f513b2bf MD |
86 | int _lttng_field_statedump(struct lttng_session *session, |
87 | const struct lttng_event_field *field, | |
88 | size_t nesting); | |
c099397a | 89 | |
c099397a | 90 | void synchronize_trace(void) |
abcca994 | 91 | { |
92da05ce MJ |
92 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
93 | synchronize_rcu(); | |
94 | #else | |
abcca994 | 95 | synchronize_sched(); |
92da05ce MJ |
96 | #endif |
97 | ||
b8590f40 MD |
98 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
99 | #ifdef CONFIG_PREEMPT_RT_FULL | |
100 | synchronize_rcu(); | |
101 | #endif | |
102 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
103 | #ifdef CONFIG_PREEMPT_RT |
104 | synchronize_rcu(); | |
105 | #endif | |
b8590f40 | 106 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
107 | } |
108 | ||
3c997079 MD |
109 | void lttng_lock_sessions(void) |
110 | { | |
111 | mutex_lock(&sessions_mutex); | |
112 | } | |
113 | ||
114 | void lttng_unlock_sessions(void) | |
115 | { | |
116 | mutex_unlock(&sessions_mutex); | |
117 | } | |
118 | ||
9fe593d2 FD |
119 | static struct lttng_transport *lttng_transport_find(const char *name) |
120 | { | |
121 | struct lttng_transport *transport; | |
122 | ||
123 | list_for_each_entry(transport, <tng_transport_list, node) { | |
124 | if (!strcmp(transport->name, name)) | |
125 | return transport; | |
126 | } | |
127 | return NULL; | |
128 | } | |
129 | ||
3c997079 MD |
130 | /* |
131 | * Called with sessions lock held. | |
132 | */ | |
133 | int lttng_session_active(void) | |
134 | { | |
135 | struct lttng_session *iter; | |
136 | ||
137 | list_for_each_entry(iter, &sessions, list) { | |
138 | if (iter->active) | |
139 | return 1; | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
a90917c3 | 144 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 145 | { |
a90917c3 | 146 | struct lttng_session *session; |
d83004aa | 147 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 148 | int i; |
4e3c1b9b MD |
149 | |
150 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 151 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 152 | if (!session) |
d83004aa | 153 | goto err; |
4e3c1b9b | 154 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 155 | INIT_LIST_HEAD(&session->events); |
a7008254 | 156 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
157 | |
158 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
159 | GFP_KERNEL); | |
160 | if (!metadata_cache) | |
161 | goto err_free_session; | |
0ca42eb7 | 162 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
163 | if (!metadata_cache->data) |
164 | goto err_free_cache; | |
165 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
166 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 167 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
168 | session->metadata_cache = metadata_cache; |
169 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
170 | memcpy(&metadata_cache->uuid, &session->uuid, |
171 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
172 | INIT_LIST_HEAD(&session->enablers_head); |
173 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
174 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 175 | list_add(&session->list, &sessions); |
d1f652f8 MD |
176 | session->pid_tracker.session = session; |
177 | session->pid_tracker.tracker_type = TRACKER_PID; | |
178 | session->vpid_tracker.session = session; | |
179 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
180 | session->uid_tracker.session = session; | |
181 | session->uid_tracker.tracker_type = TRACKER_UID; | |
182 | session->vuid_tracker.session = session; | |
183 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
184 | session->gid_tracker.session = session; | |
185 | session->gid_tracker.tracker_type = TRACKER_GID; | |
186 | session->vgid_tracker.session = session; | |
187 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
188 | mutex_unlock(&sessions_mutex); |
189 | return session; | |
d83004aa JD |
190 | |
191 | err_free_cache: | |
192 | kfree(metadata_cache); | |
193 | err_free_session: | |
48f5e0b5 | 194 | lttng_kvfree(session); |
d83004aa JD |
195 | err: |
196 | mutex_unlock(&sessions_mutex); | |
197 | return NULL; | |
198 | } | |
199 | ||
750b05f2 FD |
200 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
201 | { | |
202 | struct lttng_transport *transport = NULL; | |
203 | struct lttng_event_notifier_group *event_notifier_group; | |
204 | const char *transport_name = "relay-event-notifier"; | |
205 | size_t subbuf_size = 4096; //TODO | |
206 | size_t num_subbuf = 16; //TODO | |
207 | unsigned int switch_timer_interval = 0; | |
208 | unsigned int read_timer_interval = 0; | |
dffef45d | 209 | int i; |
750b05f2 FD |
210 | |
211 | mutex_lock(&sessions_mutex); | |
212 | ||
213 | transport = lttng_transport_find(transport_name); | |
214 | if (!transport) { | |
215 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
216 | transport_name); | |
217 | goto notransport; | |
218 | } | |
219 | if (!try_module_get(transport->owner)) { | |
220 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
221 | transport_name); | |
222 | goto notransport; | |
223 | } | |
224 | ||
225 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
226 | GFP_KERNEL); | |
227 | if (!event_notifier_group) | |
228 | goto nomem; | |
229 | ||
230 | /* | |
231 | * Initialize the ring buffer used to store event notifier | |
232 | * notifications. | |
233 | */ | |
234 | event_notifier_group->ops = &transport->ops; | |
235 | event_notifier_group->chan = transport->ops.channel_create( | |
236 | transport_name, event_notifier_group, NULL, | |
237 | subbuf_size, num_subbuf, switch_timer_interval, | |
238 | read_timer_interval); | |
239 | if (!event_notifier_group->chan) | |
240 | goto create_error; | |
241 | ||
242 | event_notifier_group->transport = transport; | |
dffef45d FD |
243 | |
244 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
245 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
246 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
247 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
248 | ||
750b05f2 FD |
249 | list_add(&event_notifier_group->node, &event_notifier_groups); |
250 | ||
251 | mutex_unlock(&sessions_mutex); | |
252 | ||
253 | return event_notifier_group; | |
254 | ||
255 | create_error: | |
256 | lttng_kvfree(event_notifier_group); | |
257 | nomem: | |
258 | if (transport) | |
259 | module_put(transport->owner); | |
260 | notransport: | |
261 | mutex_unlock(&sessions_mutex); | |
262 | return NULL; | |
263 | } | |
264 | ||
d83004aa JD |
265 | void metadata_cache_destroy(struct kref *kref) |
266 | { | |
267 | struct lttng_metadata_cache *cache = | |
268 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 269 | vfree(cache->data); |
d83004aa | 270 | kfree(cache); |
4e3c1b9b MD |
271 | } |
272 | ||
a90917c3 | 273 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 274 | { |
a90917c3 MD |
275 | struct lttng_channel *chan, *tmpchan; |
276 | struct lttng_event *event, *tmpevent; | |
d83004aa | 277 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 278 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 279 | int ret; |
4e3c1b9b MD |
280 | |
281 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 282 | WRITE_ONCE(session->active, 0); |
1ec65de1 | 283 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 284 | ret = lttng_syscalls_unregister_event(chan); |
1ec65de1 MD |
285 | WARN_ON(ret); |
286 | } | |
dda6a249 | 287 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 288 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
289 | WARN_ON(ret); |
290 | } | |
abcca994 | 291 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 | 292 | list_for_each_entry(chan, &session->chan, list) { |
2d6d88c6 | 293 | ret = lttng_syscalls_destroy_event(chan); |
badfe9f5 MD |
294 | WARN_ON(ret); |
295 | } | |
b2bc0bc8 | 296 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 297 | &session->enablers_head, node) |
b2bc0bc8 | 298 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 299 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 300 | _lttng_event_destroy(event); |
d83004aa JD |
301 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
302 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 303 | _lttng_channel_destroy(chan); |
d83004aa | 304 | } |
ab036a63 | 305 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
306 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
307 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 308 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
309 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
310 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
311 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
312 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
313 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
314 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 315 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
316 | list_del(&session->list); |
317 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 318 | lttng_kvfree(session); |
4e3c1b9b MD |
319 | } |
320 | ||
dffef45d FD |
321 | void lttng_event_notifier_group_destroy( |
322 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 323 | { |
dffef45d FD |
324 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
325 | struct lttng_event_notifier *event_notifier, *tmpevent_notifier; | |
326 | int ret; | |
327 | ||
750b05f2 FD |
328 | if (!event_notifier_group) |
329 | return; | |
330 | ||
331 | mutex_lock(&sessions_mutex); | |
dffef45d | 332 | |
8a8ac9a8 FD |
333 | ret = lttng_syscalls_unregister_event_notifier(event_notifier_group); |
334 | WARN_ON(ret); | |
335 | ||
dffef45d FD |
336 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, |
337 | &event_notifier_group->event_notifiers_head, list) { | |
338 | ret = _lttng_event_notifier_unregister(event_notifier); | |
339 | WARN_ON(ret); | |
340 | } | |
341 | ||
b01155ba FD |
342 | /* Wait for in-flight event notifier to complete */ |
343 | synchronize_trace(); | |
344 | ||
21f58fb7 FD |
345 | irq_work_sync(&event_notifier_group->wakeup_pending); |
346 | ||
8a8ac9a8 FD |
347 | kfree(event_notifier_group->sc_filter); |
348 | ||
dffef45d FD |
349 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
350 | &event_notifier_group->enablers_head, node) | |
351 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
352 | ||
353 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
354 | &event_notifier_group->event_notifiers_head, list) | |
355 | _lttng_event_notifier_destroy(event_notifier); | |
356 | ||
750b05f2 FD |
357 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
358 | module_put(event_notifier_group->transport->owner); | |
359 | list_del(&event_notifier_group->node); | |
dffef45d | 360 | |
750b05f2 FD |
361 | mutex_unlock(&sessions_mutex); |
362 | lttng_kvfree(event_notifier_group); | |
363 | } | |
364 | ||
601252cf MD |
365 | int lttng_session_statedump(struct lttng_session *session) |
366 | { | |
367 | int ret; | |
368 | ||
369 | mutex_lock(&sessions_mutex); | |
370 | ret = lttng_statedump_start(session); | |
371 | mutex_unlock(&sessions_mutex); | |
372 | return ret; | |
373 | } | |
374 | ||
a90917c3 | 375 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
376 | { |
377 | int ret = 0; | |
a90917c3 | 378 | struct lttng_channel *chan; |
c0e31d2e MD |
379 | |
380 | mutex_lock(&sessions_mutex); | |
381 | if (session->active) { | |
382 | ret = -EBUSY; | |
383 | goto end; | |
384 | } | |
c099397a | 385 | |
3c997079 MD |
386 | /* Set transient enabler state to "enabled" */ |
387 | session->tstate = 1; | |
388 | ||
4ef81e4a | 389 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 390 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 391 | |
c099397a MD |
392 | /* |
393 | * Snapshot the number of events per channel to know the type of header | |
394 | * we need to use. | |
395 | */ | |
396 | list_for_each_entry(chan, &session->chan, list) { | |
397 | if (chan->header_type) | |
398 | continue; /* don't change it if session stop/restart */ | |
399 | if (chan->free_event_id < 31) | |
400 | chan->header_type = 1; /* compact */ | |
401 | else | |
402 | chan->header_type = 2; /* large */ | |
403 | } | |
404 | ||
64af2437 | 405 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
406 | list_for_each_entry(chan, &session->chan, list) { |
407 | if (chan->channel_type != METADATA_CHANNEL) | |
408 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
409 | } | |
64af2437 | 410 | |
a8f2d0c7 MJ |
411 | WRITE_ONCE(session->active, 1); |
412 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 413 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 414 | if (ret) { |
a8f2d0c7 | 415 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
416 | goto end; |
417 | } | |
418 | ret = lttng_statedump_start(session); | |
360f38ea | 419 | if (ret) |
a8f2d0c7 | 420 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
421 | end: |
422 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 423 | return ret; |
c0e31d2e MD |
424 | } |
425 | ||
a90917c3 | 426 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
427 | { |
428 | int ret = 0; | |
64af2437 | 429 | struct lttng_channel *chan; |
c0e31d2e MD |
430 | |
431 | mutex_lock(&sessions_mutex); | |
432 | if (!session->active) { | |
433 | ret = -EBUSY; | |
434 | goto end; | |
435 | } | |
a8f2d0c7 | 436 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
437 | |
438 | /* Set transient enabler state to "disabled" */ | |
439 | session->tstate = 0; | |
b2bc0bc8 | 440 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
441 | |
442 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
443 | list_for_each_entry(chan, &session->chan, list) { |
444 | if (chan->channel_type != METADATA_CHANNEL) | |
445 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
446 | } | |
c0e31d2e MD |
447 | end: |
448 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 449 | return ret; |
c0e31d2e MD |
450 | } |
451 | ||
9616f0bf JD |
452 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
453 | { | |
454 | int ret = 0; | |
455 | struct lttng_channel *chan; | |
456 | struct lttng_event *event; | |
457 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
458 | struct lttng_metadata_stream *stream; | |
459 | ||
460 | mutex_lock(&sessions_mutex); | |
461 | if (!session->active) { | |
462 | ret = -EBUSY; | |
463 | goto end; | |
464 | } | |
465 | ||
466 | mutex_lock(&cache->lock); | |
467 | memset(cache->data, 0, cache->cache_alloc); | |
468 | cache->metadata_written = 0; | |
469 | cache->version++; | |
470 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
471 | stream->metadata_out = 0; | |
472 | stream->metadata_in = 0; | |
473 | } | |
474 | mutex_unlock(&cache->lock); | |
475 | ||
476 | session->metadata_dumped = 0; | |
477 | list_for_each_entry(chan, &session->chan, list) { | |
478 | chan->metadata_dumped = 0; | |
479 | } | |
480 | ||
481 | list_for_each_entry(event, &session->events, list) { | |
482 | event->metadata_dumped = 0; | |
483 | } | |
484 | ||
485 | ret = _lttng_session_metadata_statedump(session); | |
486 | ||
487 | end: | |
488 | mutex_unlock(&sessions_mutex); | |
489 | return ret; | |
490 | } | |
491 | ||
a90917c3 | 492 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 493 | { |
3c997079 | 494 | int ret = 0; |
e64957da | 495 | |
3c997079 MD |
496 | mutex_lock(&sessions_mutex); |
497 | if (channel->channel_type == METADATA_CHANNEL) { | |
498 | ret = -EPERM; | |
499 | goto end; | |
500 | } | |
501 | if (channel->enabled) { | |
502 | ret = -EEXIST; | |
503 | goto end; | |
504 | } | |
505 | /* Set transient enabler state to "enabled" */ | |
506 | channel->tstate = 1; | |
b2bc0bc8 | 507 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 508 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 509 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
510 | end: |
511 | mutex_unlock(&sessions_mutex); | |
512 | return ret; | |
e64957da MD |
513 | } |
514 | ||
a90917c3 | 515 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 516 | { |
3c997079 | 517 | int ret = 0; |
e64957da | 518 | |
3c997079 MD |
519 | mutex_lock(&sessions_mutex); |
520 | if (channel->channel_type == METADATA_CHANNEL) { | |
521 | ret = -EPERM; | |
522 | goto end; | |
523 | } | |
524 | if (!channel->enabled) { | |
525 | ret = -EEXIST; | |
526 | goto end; | |
527 | } | |
528 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 529 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
530 | /* Set transient enabler state to "enabled" */ |
531 | channel->tstate = 0; | |
b2bc0bc8 | 532 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
533 | end: |
534 | mutex_unlock(&sessions_mutex); | |
535 | return ret; | |
e64957da MD |
536 | } |
537 | ||
a90917c3 | 538 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 539 | { |
3c997079 | 540 | int ret = 0; |
e64957da | 541 | |
3c997079 MD |
542 | mutex_lock(&sessions_mutex); |
543 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
544 | ret = -EPERM; | |
545 | goto end; | |
546 | } | |
547 | if (event->enabled) { | |
548 | ret = -EEXIST; | |
549 | goto end; | |
550 | } | |
a0493bef MD |
551 | switch (event->instrumentation) { |
552 | case LTTNG_KERNEL_TRACEPOINT: | |
553 | case LTTNG_KERNEL_SYSCALL: | |
554 | ret = -EINVAL; | |
555 | break; | |
556 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 557 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 558 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 559 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
560 | break; |
561 | case LTTNG_KERNEL_KRETPROBE: | |
562 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
563 | break; | |
e884017c | 564 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
565 | default: |
566 | WARN_ON_ONCE(1); | |
567 | ret = -EINVAL; | |
568 | } | |
3c997079 MD |
569 | end: |
570 | mutex_unlock(&sessions_mutex); | |
571 | return ret; | |
e64957da MD |
572 | } |
573 | ||
a90917c3 | 574 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 575 | { |
3c997079 | 576 | int ret = 0; |
e64957da | 577 | |
3c997079 MD |
578 | mutex_lock(&sessions_mutex); |
579 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
580 | ret = -EPERM; | |
581 | goto end; | |
582 | } | |
583 | if (!event->enabled) { | |
584 | ret = -EEXIST; | |
585 | goto end; | |
586 | } | |
a0493bef MD |
587 | switch (event->instrumentation) { |
588 | case LTTNG_KERNEL_TRACEPOINT: | |
589 | case LTTNG_KERNEL_SYSCALL: | |
590 | ret = -EINVAL; | |
591 | break; | |
592 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 593 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 594 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 595 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
596 | break; |
597 | case LTTNG_KERNEL_KRETPROBE: | |
598 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
599 | break; | |
e884017c | 600 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
601 | default: |
602 | WARN_ON_ONCE(1); | |
603 | ret = -EINVAL; | |
604 | } | |
3c997079 MD |
605 | end: |
606 | mutex_unlock(&sessions_mutex); | |
607 | return ret; | |
e64957da MD |
608 | } |
609 | ||
dffef45d FD |
610 | int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier) |
611 | { | |
612 | int ret = 0; | |
613 | ||
614 | mutex_lock(&sessions_mutex); | |
615 | if (event_notifier->enabled) { | |
616 | ret = -EEXIST; | |
617 | goto end; | |
618 | } | |
619 | switch (event_notifier->instrumentation) { | |
620 | case LTTNG_KERNEL_TRACEPOINT: | |
8a8ac9a8 | 621 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
622 | ret = -EINVAL; |
623 | break; | |
dffef45d | 624 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 625 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
626 | WRITE_ONCE(event_notifier->enabled, 1); |
627 | break; | |
dffef45d | 628 | case LTTNG_KERNEL_FUNCTION: |
dffef45d FD |
629 | case LTTNG_KERNEL_NOOP: |
630 | case LTTNG_KERNEL_KRETPROBE: | |
631 | default: | |
632 | WARN_ON_ONCE(1); | |
633 | ret = -EINVAL; | |
634 | } | |
635 | end: | |
636 | mutex_unlock(&sessions_mutex); | |
637 | return ret; | |
638 | } | |
639 | ||
640 | int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier) | |
641 | { | |
642 | int ret = 0; | |
643 | ||
644 | mutex_lock(&sessions_mutex); | |
645 | if (!event_notifier->enabled) { | |
646 | ret = -EEXIST; | |
647 | goto end; | |
648 | } | |
649 | switch (event_notifier->instrumentation) { | |
650 | case LTTNG_KERNEL_TRACEPOINT: | |
8a8ac9a8 | 651 | case LTTNG_KERNEL_SYSCALL: |
b01155ba FD |
652 | ret = -EINVAL; |
653 | break; | |
dffef45d | 654 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 655 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
656 | WRITE_ONCE(event_notifier->enabled, 0); |
657 | break; | |
dffef45d | 658 | case LTTNG_KERNEL_FUNCTION: |
dffef45d FD |
659 | case LTTNG_KERNEL_NOOP: |
660 | case LTTNG_KERNEL_KRETPROBE: | |
661 | default: | |
662 | WARN_ON_ONCE(1); | |
663 | ret = -EINVAL; | |
664 | } | |
665 | end: | |
666 | mutex_unlock(&sessions_mutex); | |
667 | return ret; | |
668 | } | |
669 | ||
a90917c3 | 670 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
671 | const char *transport_name, |
672 | void *buf_addr, | |
4e3c1b9b MD |
673 | size_t subbuf_size, size_t num_subbuf, |
674 | unsigned int switch_timer_interval, | |
d83004aa JD |
675 | unsigned int read_timer_interval, |
676 | enum channel_type channel_type) | |
4e3c1b9b | 677 | { |
a90917c3 MD |
678 | struct lttng_channel *chan; |
679 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
680 | |
681 | mutex_lock(&sessions_mutex); | |
d83004aa | 682 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 683 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 684 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 685 | if (!transport) { |
5a15f70c | 686 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 687 | transport_name); |
c0e31d2e | 688 | goto notransport; |
f3d01b96 | 689 | } |
a33c9927 | 690 | if (!try_module_get(transport->owner)) { |
5a15f70c | 691 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
692 | goto notransport; |
693 | } | |
a90917c3 | 694 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 695 | if (!chan) |
c0e31d2e | 696 | goto nomem; |
4e3c1b9b | 697 | chan->session = session; |
05d32c64 | 698 | chan->id = session->free_chan_id++; |
3b731ab1 | 699 | chan->ops = &transport->ops; |
125b4df4 MD |
700 | /* |
701 | * Note: the channel creation op already writes into the packet | |
702 | * headers. Therefore the "chan" information used as input | |
703 | * should be already accessible. | |
704 | */ | |
5f5ddf01 MD |
705 | chan->chan = transport->ops.channel_create(transport_name, |
706 | chan, buf_addr, subbuf_size, num_subbuf, | |
707 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
708 | if (!chan->chan) |
709 | goto create_error; | |
3c997079 | 710 | chan->tstate = 1; |
e64957da | 711 | chan->enabled = 1; |
a33c9927 | 712 | chan->transport = transport; |
d83004aa | 713 | chan->channel_type = channel_type; |
4e3c1b9b MD |
714 | list_add(&chan->list, &session->chan); |
715 | mutex_unlock(&sessions_mutex); | |
716 | return chan; | |
717 | ||
f3d01b96 MD |
718 | create_error: |
719 | kfree(chan); | |
c0e31d2e | 720 | nomem: |
a33c9927 MD |
721 | if (transport) |
722 | module_put(transport->owner); | |
c0e31d2e | 723 | notransport: |
e5382b6d | 724 | active: |
4e3c1b9b MD |
725 | mutex_unlock(&sessions_mutex); |
726 | return NULL; | |
727 | } | |
728 | ||
729 | /* | |
d83004aa JD |
730 | * Only used internally at session destruction for per-cpu channels, and |
731 | * when metadata channel is released. | |
732 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 733 | */ |
aa7c23a9 | 734 | static |
a90917c3 | 735 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 736 | { |
11b5a3c2 | 737 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 738 | module_put(chan->transport->owner); |
4e3c1b9b | 739 | list_del(&chan->list); |
8070f5c0 | 740 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
741 | kfree(chan); |
742 | } | |
743 | ||
d83004aa JD |
744 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
745 | { | |
746 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
747 | ||
748 | /* Protect the metadata cache with the sessions_mutex. */ | |
749 | mutex_lock(&sessions_mutex); | |
750 | _lttng_channel_destroy(chan); | |
751 | mutex_unlock(&sessions_mutex); | |
752 | } | |
753 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
754 | ||
755 | static | |
756 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
757 | { | |
758 | stream->finalized = 1; | |
759 | wake_up_interruptible(&stream->read_wait); | |
760 | } | |
761 | ||
e5382b6d MD |
762 | /* |
763 | * Supports event creation while tracing session is active. | |
3c997079 | 764 | * Needs to be called with sessions mutex held. |
e5382b6d | 765 | */ |
3c997079 MD |
766 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
767 | struct lttng_kernel_event *event_param, | |
768 | void *filter, | |
769 | const struct lttng_event_desc *event_desc, | |
770 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 771 | { |
3c997079 | 772 | struct lttng_session *session = chan->session; |
a90917c3 | 773 | struct lttng_event *event; |
3c997079 MD |
774 | const char *event_name; |
775 | struct hlist_head *head; | |
3d084699 | 776 | int ret; |
4e3c1b9b | 777 | |
abc0446a | 778 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 779 | ret = -EMFILE; |
e5382b6d | 780 | goto full; |
abc0446a | 781 | } |
3c997079 MD |
782 | |
783 | switch (itype) { | |
784 | case LTTNG_KERNEL_TRACEPOINT: | |
785 | event_name = event_desc->name; | |
786 | break; | |
787 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 788 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 789 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 790 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 791 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
792 | event_name = event_param->name; |
793 | break; | |
e884017c | 794 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
795 | default: |
796 | WARN_ON_ONCE(1); | |
797 | ret = -EINVAL; | |
798 | goto type_error; | |
799 | } | |
4a11ef1c FD |
800 | |
801 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
802 | LTTNG_EVENT_HT_SIZE, event_name); | |
d216ecae | 803 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
804 | WARN_ON_ONCE(!event->desc); |
805 | if (!strncmp(event->desc->name, event_name, | |
806 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
807 | && chan == event->chan) { | |
808 | ret = -EEXIST; | |
809 | goto exist; | |
abc0446a MD |
810 | } |
811 | } | |
3c997079 | 812 | |
11b5a3c2 | 813 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 814 | if (!event) { |
4cf0bf51 | 815 | ret = -ENOMEM; |
4e3c1b9b | 816 | goto cache_error; |
abc0446a | 817 | } |
4e3c1b9b MD |
818 | event->chan = chan; |
819 | event->filter = filter; | |
e5382b6d | 820 | event->id = chan->free_event_id++; |
3c997079 MD |
821 | event->instrumentation = itype; |
822 | event->evtype = LTTNG_TYPE_EVENT; | |
183e8b3a | 823 | INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
3c997079 MD |
824 | INIT_LIST_HEAD(&event->enablers_ref_head); |
825 | ||
826 | switch (itype) { | |
ab2277d6 | 827 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
828 | /* Event will be enabled by enabler sync. */ |
829 | event->enabled = 0; | |
830 | event->registered = 0; | |
0bcedee9 | 831 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 832 | if (!event->desc) { |
4cf0bf51 | 833 | ret = -ENOENT; |
d3dbe23c | 834 | goto register_error; |
abc0446a | 835 | } |
3c997079 MD |
836 | /* Populate lttng_event structure before event registration. */ |
837 | smp_wmb(); | |
baf20995 | 838 | break; |
ab2277d6 | 839 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
840 | /* |
841 | * Needs to be explicitly enabled after creation, since | |
842 | * we may want to apply filters. | |
843 | */ | |
844 | event->enabled = 0; | |
3c997079 MD |
845 | event->registered = 1; |
846 | /* | |
847 | * Populate lttng_event structure before event | |
848 | * registration. | |
849 | */ | |
850 | smp_wmb(); | |
8bf17deb | 851 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
852 | event_param->u.kprobe.symbol_name, |
853 | event_param->u.kprobe.offset, | |
854 | event_param->u.kprobe.addr, | |
855 | event); | |
abc0446a | 856 | if (ret) { |
4cf0bf51 | 857 | ret = -EINVAL; |
d6d808f3 | 858 | goto register_error; |
abc0446a | 859 | } |
edeb3137 MD |
860 | ret = try_module_get(event->desc->owner); |
861 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 862 | break; |
7371f44c MD |
863 | case LTTNG_KERNEL_KRETPROBE: |
864 | { | |
a90917c3 | 865 | struct lttng_event *event_return; |
7371f44c MD |
866 | |
867 | /* kretprobe defines 2 events */ | |
a0493bef MD |
868 | /* |
869 | * Needs to be explicitly enabled after creation, since | |
870 | * we may want to apply filters. | |
871 | */ | |
872 | event->enabled = 0; | |
3c997079 | 873 | event->registered = 1; |
7371f44c MD |
874 | event_return = |
875 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 876 | if (!event_return) { |
4cf0bf51 | 877 | ret = -ENOMEM; |
7371f44c | 878 | goto register_error; |
abc0446a | 879 | } |
7371f44c MD |
880 | event_return->chan = chan; |
881 | event_return->filter = filter; | |
882 | event_return->id = chan->free_event_id++; | |
a0493bef | 883 | event_return->enabled = 0; |
3c997079 MD |
884 | event_return->registered = 1; |
885 | event_return->instrumentation = itype; | |
7371f44c | 886 | /* |
a90917c3 | 887 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
888 | */ |
889 | smp_wmb(); | |
3c997079 | 890 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
891 | event_param->u.kretprobe.symbol_name, |
892 | event_param->u.kretprobe.offset, | |
893 | event_param->u.kretprobe.addr, | |
894 | event, event_return); | |
895 | if (ret) { | |
896 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 897 | ret = -EINVAL; |
7371f44c MD |
898 | goto register_error; |
899 | } | |
900 | /* Take 2 refs on the module: one per event. */ | |
901 | ret = try_module_get(event->desc->owner); | |
902 | WARN_ON_ONCE(!ret); | |
903 | ret = try_module_get(event->desc->owner); | |
904 | WARN_ON_ONCE(!ret); | |
a90917c3 | 905 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 906 | event_return); |
abc0446a | 907 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
908 | if (ret) { |
909 | kmem_cache_free(event_cache, event_return); | |
910 | module_put(event->desc->owner); | |
911 | module_put(event->desc->owner); | |
912 | goto statedump_error; | |
913 | } | |
914 | list_add(&event_return->list, &chan->session->events); | |
915 | break; | |
916 | } | |
1ec65de1 | 917 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 918 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
919 | /* |
920 | * Needs to be explicitly enabled after creation, since | |
921 | * we may want to apply filters. | |
922 | */ | |
923 | event->enabled = 0; | |
3c997079 MD |
924 | event->registered = 0; |
925 | event->desc = event_desc; | |
badfe9f5 MD |
926 | switch (event_param->u.syscall.entryexit) { |
927 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
928 | ret = -EINVAL; | |
929 | goto register_error; | |
930 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
931 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
932 | break; | |
933 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
934 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
935 | break; | |
936 | } | |
937 | switch (event_param->u.syscall.abi) { | |
938 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
939 | ret = -EINVAL; | |
940 | goto register_error; | |
941 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
942 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
943 | break; | |
944 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
945 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
946 | break; | |
947 | } | |
abc0446a | 948 | if (!event->desc) { |
4cf0bf51 | 949 | ret = -EINVAL; |
259b6cb3 | 950 | goto register_error; |
abc0446a | 951 | } |
1ec65de1 | 952 | break; |
149b9a9d | 953 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
954 | /* |
955 | * Needs to be explicitly enabled after creation, since | |
956 | * we may want to apply filters. | |
957 | */ | |
958 | event->enabled = 0; | |
959 | event->registered = 1; | |
3aed4dca | 960 | |
a344f64b FD |
961 | /* |
962 | * Populate lttng_event structure before event | |
963 | * registration. | |
964 | */ | |
965 | smp_wmb(); | |
149b9a9d | 966 | |
83b802dc | 967 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 968 | event_param->u.uprobe.fd, |
149b9a9d YB |
969 | event); |
970 | if (ret) | |
971 | goto register_error; | |
972 | ret = try_module_get(event->desc->owner); | |
973 | WARN_ON_ONCE(!ret); | |
974 | break; | |
e884017c | 975 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
976 | default: |
977 | WARN_ON_ONCE(1); | |
4cf0bf51 | 978 | ret = -EINVAL; |
df07930b | 979 | goto register_error; |
baf20995 | 980 | } |
a90917c3 | 981 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
982 | WARN_ON_ONCE(ret > 0); |
983 | if (ret) { | |
c099397a | 984 | goto statedump_error; |
abc0446a | 985 | } |
3c997079 | 986 | hlist_add_head(&event->hlist, head); |
dda6a249 | 987 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
988 | return event; |
989 | ||
c099397a | 990 | statedump_error: |
259b6cb3 | 991 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 992 | register_error: |
11b5a3c2 | 993 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
994 | cache_error: |
995 | exist: | |
3c997079 | 996 | type_error: |
e5382b6d | 997 | full: |
4cf0bf51 | 998 | return ERR_PTR(ret); |
4e3c1b9b MD |
999 | } |
1000 | ||
dffef45d FD |
1001 | struct lttng_event_notifier *_lttng_event_notifier_create( |
1002 | const struct lttng_event_desc *event_desc, | |
1003 | uint64_t token, struct lttng_event_notifier_group *event_notifier_group, | |
1004 | struct lttng_kernel_event_notifier *event_notifier_param, | |
1005 | void *filter, enum lttng_kernel_instrumentation itype) | |
1006 | { | |
1007 | struct lttng_event_notifier *event_notifier; | |
1008 | const char *event_name; | |
1009 | struct hlist_head *head; | |
1010 | int ret; | |
1011 | ||
1012 | switch (itype) { | |
1013 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1014 | event_name = event_desc->name; |
1015 | break; | |
dffef45d | 1016 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 1017 | case LTTNG_KERNEL_UPROBE: |
8a8ac9a8 | 1018 | case LTTNG_KERNEL_SYSCALL: |
2b16f0c9 FD |
1019 | event_name = event_notifier_param->event.name; |
1020 | break; | |
dffef45d FD |
1021 | case LTTNG_KERNEL_KRETPROBE: |
1022 | case LTTNG_KERNEL_FUNCTION: | |
1023 | case LTTNG_KERNEL_NOOP: | |
dffef45d FD |
1024 | default: |
1025 | WARN_ON_ONCE(1); | |
1026 | ret = -EINVAL; | |
1027 | goto type_error; | |
1028 | } | |
1029 | ||
1030 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1031 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
1032 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1033 | WARN_ON_ONCE(!event_notifier->desc); | |
1034 | if (!strncmp(event_notifier->desc->name, event_name, | |
1035 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
1036 | && event_notifier_group == event_notifier->group | |
1037 | && token == event_notifier->user_token) { | |
1038 | ret = -EEXIST; | |
1039 | goto exist; | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1044 | if (!event_notifier) { | |
1045 | ret = -ENOMEM; | |
1046 | goto cache_error; | |
1047 | } | |
21f58fb7 | 1048 | |
dffef45d FD |
1049 | event_notifier->group = event_notifier_group; |
1050 | event_notifier->user_token = token; | |
99d223ad | 1051 | event_notifier->num_captures = 0; |
dffef45d FD |
1052 | event_notifier->filter = filter; |
1053 | event_notifier->instrumentation = itype; | |
1054 | event_notifier->evtype = LTTNG_TYPE_EVENT; | |
21f58fb7 | 1055 | event_notifier->send_notification = lttng_event_notifier_notification_send; |
183e8b3a | 1056 | INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); |
99d223ad | 1057 | INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
dffef45d FD |
1058 | INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
1059 | ||
1060 | switch (itype) { | |
1061 | case LTTNG_KERNEL_TRACEPOINT: | |
1062 | /* Event will be enabled by enabler sync. */ | |
1063 | event_notifier->enabled = 0; | |
1064 | event_notifier->registered = 0; | |
1065 | event_notifier->desc = lttng_event_desc_get(event_name); | |
1066 | if (!event_notifier->desc) { | |
1067 | ret = -ENOENT; | |
1068 | goto register_error; | |
1069 | } | |
1070 | /* Populate lttng_event_notifier structure before event registration. */ | |
1071 | smp_wmb(); | |
1072 | break; | |
1073 | case LTTNG_KERNEL_KPROBE: | |
2b16f0c9 FD |
1074 | /* |
1075 | * Needs to be explicitly enabled after creation, since | |
1076 | * we may want to apply filters. | |
1077 | */ | |
1078 | event_notifier->enabled = 0; | |
1079 | event_notifier->registered = 1; | |
1080 | /* | |
1081 | * Populate lttng_event_notifier structure before event | |
1082 | * registration. | |
1083 | */ | |
1084 | smp_wmb(); | |
1085 | ret = lttng_kprobes_register_event_notifier( | |
1086 | event_notifier_param->event.u.kprobe.symbol_name, | |
1087 | event_notifier_param->event.u.kprobe.offset, | |
1088 | event_notifier_param->event.u.kprobe.addr, | |
1089 | event_notifier); | |
1090 | if (ret) { | |
1091 | ret = -EINVAL; | |
1092 | goto register_error; | |
1093 | } | |
1094 | ret = try_module_get(event_notifier->desc->owner); | |
1095 | WARN_ON_ONCE(!ret); | |
1096 | break; | |
8a8ac9a8 FD |
1097 | case LTTNG_KERNEL_NOOP: |
1098 | case LTTNG_KERNEL_SYSCALL: | |
1099 | /* | |
1100 | * Needs to be explicitly enabled after creation, since | |
1101 | * we may want to apply filters. | |
1102 | */ | |
1103 | event_notifier->enabled = 0; | |
1104 | event_notifier->registered = 0; | |
1105 | event_notifier->desc = event_desc; | |
1106 | switch (event_notifier_param->event.u.syscall.entryexit) { | |
1107 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1108 | ret = -EINVAL; | |
1109 | goto register_error; | |
1110 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1111 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
1112 | break; | |
1113 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1114 | event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
1115 | break; | |
1116 | } | |
1117 | switch (event_notifier_param->event.u.syscall.abi) { | |
1118 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1119 | ret = -EINVAL; | |
1120 | goto register_error; | |
1121 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1122 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
1123 | break; | |
1124 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1125 | event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
1126 | break; | |
1127 | } | |
1128 | ||
1129 | if (!event_notifier->desc) { | |
1130 | ret = -EINVAL; | |
1131 | goto register_error; | |
1132 | } | |
1133 | break; | |
dffef45d | 1134 | case LTTNG_KERNEL_UPROBE: |
9de67196 FD |
1135 | /* |
1136 | * Needs to be explicitly enabled after creation, since | |
1137 | * we may want to apply filters. | |
1138 | */ | |
1139 | event_notifier->enabled = 0; | |
1140 | event_notifier->registered = 1; | |
1141 | ||
1142 | /* | |
1143 | * Populate lttng_event_notifier structure before | |
1144 | * event_notifier registration. | |
1145 | */ | |
1146 | smp_wmb(); | |
1147 | ||
1148 | ret = lttng_uprobes_register_event_notifier( | |
1149 | event_notifier_param->event.name, | |
1150 | event_notifier_param->event.u.uprobe.fd, | |
1151 | event_notifier); | |
1152 | if (ret) | |
1153 | goto register_error; | |
1154 | ret = try_module_get(event_notifier->desc->owner); | |
1155 | WARN_ON_ONCE(!ret); | |
1156 | break; | |
dffef45d FD |
1157 | case LTTNG_KERNEL_KRETPROBE: |
1158 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
1159 | default: |
1160 | WARN_ON_ONCE(1); | |
1161 | ret = -EINVAL; | |
1162 | goto register_error; | |
1163 | } | |
1164 | ||
1165 | list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head); | |
1166 | hlist_add_head(&event_notifier->hlist, head); | |
1167 | return event_notifier; | |
1168 | ||
1169 | register_error: | |
1170 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1171 | cache_error: | |
1172 | exist: | |
1173 | type_error: | |
1174 | return ERR_PTR(ret); | |
1175 | } | |
1176 | ||
3c997079 MD |
1177 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
1178 | struct lttng_kernel_event *event_param, | |
1179 | void *filter, | |
1180 | const struct lttng_event_desc *event_desc, | |
1181 | enum lttng_kernel_instrumentation itype) | |
1182 | { | |
1183 | struct lttng_event *event; | |
1184 | ||
1185 | mutex_lock(&sessions_mutex); | |
1186 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
1187 | itype); | |
1188 | mutex_unlock(&sessions_mutex); | |
1189 | return event; | |
1190 | } | |
1191 | ||
dffef45d FD |
1192 | struct lttng_event_notifier *lttng_event_notifier_create( |
1193 | const struct lttng_event_desc *event_desc, | |
1194 | uint64_t id, struct lttng_event_notifier_group *event_notifier_group, | |
1195 | struct lttng_kernel_event_notifier *event_notifier_param, | |
1196 | void *filter, enum lttng_kernel_instrumentation itype) | |
1197 | { | |
1198 | struct lttng_event_notifier *event_notifier; | |
1199 | ||
1200 | mutex_lock(&sessions_mutex); | |
1201 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
1202 | event_notifier_group, event_notifier_param, filter, itype); | |
1203 | mutex_unlock(&sessions_mutex); | |
1204 | return event_notifier; | |
1205 | } | |
1206 | ||
3c997079 MD |
1207 | /* Only used for tracepoints for now. */ |
1208 | static | |
1209 | void register_event(struct lttng_event *event) | |
1210 | { | |
1211 | const struct lttng_event_desc *desc; | |
f127e61e | 1212 | int ret = -EINVAL; |
3c997079 | 1213 | |
3c997079 MD |
1214 | if (event->registered) |
1215 | return; | |
4ecb5ad5 | 1216 | |
3c997079 | 1217 | desc = event->desc; |
4ecb5ad5 MD |
1218 | switch (event->instrumentation) { |
1219 | case LTTNG_KERNEL_TRACEPOINT: | |
1220 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
1221 | desc->probe_callback, | |
1222 | event); | |
1223 | break; | |
1224 | case LTTNG_KERNEL_SYSCALL: | |
2d6d88c6 | 1225 | ret = lttng_syscall_filter_enable_event(event->chan, event); |
4ecb5ad5 MD |
1226 | break; |
1227 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 1228 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 1229 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
1230 | case LTTNG_KERNEL_NOOP: |
1231 | ret = 0; | |
1232 | break; | |
e884017c | 1233 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
1234 | default: |
1235 | WARN_ON_ONCE(1); | |
1236 | } | |
3c997079 MD |
1237 | if (!ret) |
1238 | event->registered = 1; | |
1239 | } | |
1240 | ||
4e3c1b9b MD |
1241 | /* |
1242 | * Only used internally at session destruction. | |
1243 | */ | |
a90917c3 | 1244 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 1245 | { |
4ecb5ad5 | 1246 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
1247 | int ret = -EINVAL; |
1248 | ||
3c997079 MD |
1249 | if (!event->registered) |
1250 | return 0; | |
1251 | ||
4ecb5ad5 | 1252 | desc = event->desc; |
38d024ae | 1253 | switch (event->instrumentation) { |
ab2277d6 | 1254 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 1255 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 1256 | event->desc->probe_callback, |
11b5a3c2 | 1257 | event); |
baf20995 | 1258 | break; |
ab2277d6 | 1259 | case LTTNG_KERNEL_KPROBE: |
8bf17deb | 1260 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1261 | ret = 0; |
1262 | break; | |
7371f44c MD |
1263 | case LTTNG_KERNEL_KRETPROBE: |
1264 | lttng_kretprobes_unregister(event); | |
1265 | ret = 0; | |
1266 | break; | |
33a39a3c | 1267 | case LTTNG_KERNEL_SYSCALL: |
2d6d88c6 | 1268 | ret = lttng_syscall_filter_disable_event(event->chan, event); |
4ecb5ad5 MD |
1269 | break; |
1270 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
1271 | ret = 0; |
1272 | break; | |
149b9a9d | 1273 | case LTTNG_KERNEL_UPROBE: |
83b802dc | 1274 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1275 | ret = 0; |
1276 | break; | |
e884017c | 1277 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1278 | default: |
1279 | WARN_ON_ONCE(1); | |
1280 | } | |
3c997079 MD |
1281 | if (!ret) |
1282 | event->registered = 0; | |
dda6a249 MD |
1283 | return ret; |
1284 | } | |
1285 | ||
dffef45d FD |
1286 | /* Only used for tracepoints for now. */ |
1287 | static | |
b01155ba | 1288 | void register_event_notifier(struct lttng_event_notifier *event_notifier) |
dffef45d FD |
1289 | { |
1290 | const struct lttng_event_desc *desc; | |
1291 | int ret = -EINVAL; | |
1292 | ||
1293 | if (event_notifier->registered) | |
1294 | return; | |
1295 | ||
1296 | desc = event_notifier->desc; | |
1297 | switch (event_notifier->instrumentation) { | |
1298 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1299 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, |
1300 | desc->event_notifier_callback, | |
1301 | event_notifier); | |
1302 | break; | |
8a8ac9a8 FD |
1303 | case LTTNG_KERNEL_SYSCALL: |
1304 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); | |
1305 | break; | |
dffef45d | 1306 | case LTTNG_KERNEL_KPROBE: |
9de67196 | 1307 | case LTTNG_KERNEL_UPROBE: |
2b16f0c9 FD |
1308 | ret = 0; |
1309 | break; | |
dffef45d FD |
1310 | case LTTNG_KERNEL_KRETPROBE: |
1311 | case LTTNG_KERNEL_FUNCTION: | |
1312 | case LTTNG_KERNEL_NOOP: | |
1313 | default: | |
1314 | WARN_ON_ONCE(1); | |
1315 | } | |
1316 | if (!ret) | |
1317 | event_notifier->registered = 1; | |
1318 | } | |
1319 | ||
1320 | static | |
1321 | int _lttng_event_notifier_unregister( | |
1322 | struct lttng_event_notifier *event_notifier) | |
1323 | { | |
1324 | const struct lttng_event_desc *desc; | |
1325 | int ret = -EINVAL; | |
1326 | ||
1327 | if (!event_notifier->registered) | |
1328 | return 0; | |
1329 | ||
1330 | desc = event_notifier->desc; | |
1331 | switch (event_notifier->instrumentation) { | |
1332 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1333 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname, |
1334 | event_notifier->desc->event_notifier_callback, | |
1335 | event_notifier); | |
1336 | break; | |
dffef45d | 1337 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1338 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1339 | ret = 0; | |
1340 | break; | |
9de67196 FD |
1341 | case LTTNG_KERNEL_UPROBE: |
1342 | lttng_uprobes_unregister_event_notifier(event_notifier); | |
1343 | ret = 0; | |
1344 | break; | |
8a8ac9a8 FD |
1345 | case LTTNG_KERNEL_SYSCALL: |
1346 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); | |
1347 | break; | |
dffef45d FD |
1348 | case LTTNG_KERNEL_KRETPROBE: |
1349 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d | 1350 | case LTTNG_KERNEL_NOOP: |
dffef45d FD |
1351 | default: |
1352 | WARN_ON_ONCE(1); | |
1353 | } | |
1354 | if (!ret) | |
1355 | event_notifier->registered = 0; | |
1356 | return ret; | |
1357 | } | |
1358 | ||
dda6a249 MD |
1359 | /* |
1360 | * Only used internally at session destruction. | |
1361 | */ | |
be066e6c | 1362 | static |
a90917c3 | 1363 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 1364 | { |
edeb3137 MD |
1365 | switch (event->instrumentation) { |
1366 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 1367 | lttng_event_desc_put(event->desc); |
edeb3137 MD |
1368 | break; |
1369 | case LTTNG_KERNEL_KPROBE: | |
1370 | module_put(event->desc->owner); | |
8bf17deb | 1371 | lttng_kprobes_destroy_event_private(event); |
edeb3137 | 1372 | break; |
7371f44c MD |
1373 | case LTTNG_KERNEL_KRETPROBE: |
1374 | module_put(event->desc->owner); | |
1375 | lttng_kretprobes_destroy_private(event); | |
1376 | break; | |
259b6cb3 | 1377 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 1378 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1379 | break; |
149b9a9d YB |
1380 | case LTTNG_KERNEL_UPROBE: |
1381 | module_put(event->desc->owner); | |
83b802dc | 1382 | lttng_uprobes_destroy_event_private(event); |
149b9a9d | 1383 | break; |
e884017c | 1384 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
1385 | default: |
1386 | WARN_ON_ONCE(1); | |
1387 | } | |
dda6a249 | 1388 | list_del(&event->list); |
8070f5c0 | 1389 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 1390 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1391 | } |
1392 | ||
dffef45d FD |
1393 | /* |
1394 | * Only used internally at session destruction. | |
1395 | */ | |
1396 | static | |
1397 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
1398 | { | |
1399 | switch (event_notifier->instrumentation) { | |
1400 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1401 | lttng_event_desc_put(event_notifier->desc); |
1402 | break; | |
dffef45d | 1403 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1404 | module_put(event_notifier->desc->owner); |
1405 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1406 | break; | |
8a8ac9a8 FD |
1407 | case LTTNG_KERNEL_NOOP: |
1408 | case LTTNG_KERNEL_SYSCALL: | |
1409 | break; | |
9de67196 FD |
1410 | case LTTNG_KERNEL_UPROBE: |
1411 | module_put(event_notifier->desc->owner); | |
1412 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1413 | break; | |
dffef45d FD |
1414 | case LTTNG_KERNEL_KRETPROBE: |
1415 | case LTTNG_KERNEL_FUNCTION: | |
dffef45d FD |
1416 | default: |
1417 | WARN_ON_ONCE(1); | |
1418 | } | |
1419 | list_del(&event_notifier->list); | |
1420 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1421 | } | |
1422 | ||
d1f652f8 MD |
1423 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1424 | enum tracker_type tracker_type) | |
e0130fab | 1425 | { |
d1f652f8 MD |
1426 | switch (tracker_type) { |
1427 | case TRACKER_PID: | |
1428 | return &session->pid_tracker; | |
1429 | case TRACKER_VPID: | |
1430 | return &session->vpid_tracker; | |
1431 | case TRACKER_UID: | |
1432 | return &session->uid_tracker; | |
1433 | case TRACKER_VUID: | |
1434 | return &session->vuid_tracker; | |
1435 | case TRACKER_GID: | |
1436 | return &session->gid_tracker; | |
1437 | case TRACKER_VGID: | |
1438 | return &session->vgid_tracker; | |
1439 | default: | |
1440 | WARN_ON_ONCE(1); | |
1441 | return NULL; | |
1442 | } | |
1443 | } | |
1444 | ||
1445 | int lttng_session_track_id(struct lttng_session *session, | |
1446 | enum tracker_type tracker_type, int id) | |
1447 | { | |
1448 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1449 | int ret; |
1450 | ||
d1f652f8 MD |
1451 | tracker = get_tracker(session, tracker_type); |
1452 | if (!tracker) | |
1453 | return -EINVAL; | |
1454 | if (id < -1) | |
e0130fab MD |
1455 | return -EINVAL; |
1456 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1457 | if (id == -1) { |
1458 | /* track all ids: destroy tracker. */ | |
1459 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1460 | ret = 0; |
1461 | } else { | |
d1f652f8 | 1462 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1463 | } |
e0130fab MD |
1464 | mutex_unlock(&sessions_mutex); |
1465 | return ret; | |
1466 | } | |
1467 | ||
d1f652f8 MD |
1468 | int lttng_session_untrack_id(struct lttng_session *session, |
1469 | enum tracker_type tracker_type, int id) | |
e0130fab | 1470 | { |
d1f652f8 | 1471 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1472 | int ret; |
1473 | ||
d1f652f8 MD |
1474 | tracker = get_tracker(session, tracker_type); |
1475 | if (!tracker) | |
1476 | return -EINVAL; | |
1477 | if (id < -1) | |
e0130fab MD |
1478 | return -EINVAL; |
1479 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1480 | if (id == -1) { |
1481 | /* untrack all ids: replace by empty tracker. */ | |
1482 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1483 | } else { |
d1f652f8 | 1484 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1485 | } |
e0130fab MD |
1486 | mutex_unlock(&sessions_mutex); |
1487 | return ret; | |
1488 | } | |
1489 | ||
7e6f9ef6 | 1490 | static |
d1f652f8 | 1491 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1492 | { |
d1f652f8 MD |
1493 | struct lttng_id_tracker *id_tracker = m->private; |
1494 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1495 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1496 | int iter = 0, i; |
1497 | ||
1498 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1499 | if (id_tracker_p) { |
1500 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1501 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1502 | |
f934e302 | 1503 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1504 | if (iter++ >= *pos) |
1505 | return e; | |
1506 | } | |
1507 | } | |
1508 | } else { | |
d1f652f8 | 1509 | /* ID tracker disabled. */ |
7e6f9ef6 | 1510 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1511 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1512 | } |
1513 | iter++; | |
1514 | } | |
1515 | /* End of list */ | |
1516 | return NULL; | |
1517 | } | |
1518 | ||
1519 | /* Called with sessions_mutex held. */ | |
1520 | static | |
d1f652f8 | 1521 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1522 | { |
d1f652f8 MD |
1523 | struct lttng_id_tracker *id_tracker = m->private; |
1524 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1525 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1526 | int iter = 0, i; |
1527 | ||
1528 | (*ppos)++; | |
d1f652f8 MD |
1529 | if (id_tracker_p) { |
1530 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1531 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1532 | |
f934e302 | 1533 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1534 | if (iter++ >= *ppos) |
1535 | return e; | |
1536 | } | |
1537 | } | |
1538 | } else { | |
d1f652f8 | 1539 | /* ID tracker disabled. */ |
7e6f9ef6 | 1540 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1541 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1542 | iter++; |
1543 | } | |
1544 | ||
1545 | /* End of list */ | |
1546 | return NULL; | |
1547 | } | |
1548 | ||
1549 | static | |
d1f652f8 | 1550 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1551 | { |
1552 | mutex_unlock(&sessions_mutex); | |
1553 | } | |
1554 | ||
1555 | static | |
d1f652f8 | 1556 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1557 | { |
d1f652f8 MD |
1558 | struct lttng_id_tracker *id_tracker = m->private; |
1559 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1560 | int id; | |
7e6f9ef6 | 1561 | |
d1f652f8 | 1562 | if (p == id_tracker_p) { |
7e6f9ef6 | 1563 | /* Tracker disabled. */ |
d1f652f8 | 1564 | id = -1; |
7e6f9ef6 | 1565 | } else { |
d1f652f8 | 1566 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1567 | |
d1f652f8 MD |
1568 | id = lttng_id_tracker_get_node_id(e); |
1569 | } | |
1570 | switch (id_tracker->tracker_type) { | |
1571 | case TRACKER_PID: | |
1572 | seq_printf(m, "process { pid = %d; };\n", id); | |
1573 | break; | |
1574 | case TRACKER_VPID: | |
1575 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1576 | break; | |
1577 | case TRACKER_UID: | |
1578 | seq_printf(m, "user { uid = %d; };\n", id); | |
1579 | break; | |
1580 | case TRACKER_VUID: | |
1581 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1582 | break; | |
1583 | case TRACKER_GID: | |
1584 | seq_printf(m, "group { gid = %d; };\n", id); | |
1585 | break; | |
1586 | case TRACKER_VGID: | |
1587 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1588 | break; | |
1589 | default: | |
1590 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1591 | } |
7e6f9ef6 MD |
1592 | return 0; |
1593 | } | |
1594 | ||
1595 | static | |
d1f652f8 MD |
1596 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1597 | .start = id_list_start, | |
1598 | .next = id_list_next, | |
1599 | .stop = id_list_stop, | |
1600 | .show = id_list_show, | |
7e6f9ef6 MD |
1601 | }; |
1602 | ||
1603 | static | |
d1f652f8 | 1604 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1605 | { |
d1f652f8 | 1606 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1607 | } |
1608 | ||
1609 | static | |
d1f652f8 | 1610 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1611 | { |
1612 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1613 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1614 | int ret; |
1615 | ||
d1f652f8 | 1616 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1617 | ret = seq_release(inode, file); |
d1f652f8 MD |
1618 | if (!ret) |
1619 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1620 | return ret; |
1621 | } | |
1622 | ||
d1f652f8 | 1623 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1624 | .owner = THIS_MODULE, |
d1f652f8 | 1625 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1626 | .read = seq_read, |
1627 | .llseek = seq_lseek, | |
d1f652f8 | 1628 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1629 | }; |
1630 | ||
d1f652f8 MD |
1631 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1632 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1633 | { |
d1f652f8 | 1634 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1635 | struct seq_file *m; |
1636 | int file_fd, ret; | |
1637 | ||
1638 | file_fd = lttng_get_unused_fd(); | |
1639 | if (file_fd < 0) { | |
1640 | ret = file_fd; | |
1641 | goto fd_error; | |
1642 | } | |
1643 | ||
d1f652f8 MD |
1644 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1645 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1646 | NULL, O_RDWR); |
d1f652f8 MD |
1647 | if (IS_ERR(tracker_ids_list_file)) { |
1648 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1649 | goto file_error; |
1650 | } | |
98d7281c MJ |
1651 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1652 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1653 | goto refcount_error; |
1654 | } | |
d1f652f8 | 1655 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1656 | if (ret < 0) |
1657 | goto open_error; | |
d1f652f8 MD |
1658 | m = tracker_ids_list_file->private_data; |
1659 | ||
1660 | m->private = get_tracker(session, tracker_type); | |
1661 | BUG_ON(!m->private); | |
1662 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1663 | |
1664 | return file_fd; | |
1665 | ||
1666 | open_error: | |
9c1f4643 MD |
1667 | atomic_long_dec(&session->file->f_count); |
1668 | refcount_error: | |
d1f652f8 | 1669 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1670 | file_error: |
1671 | put_unused_fd(file_fd); | |
1672 | fd_error: | |
1673 | return ret; | |
1674 | } | |
1675 | ||
3c997079 MD |
1676 | /* |
1677 | * Enabler management. | |
1678 | */ | |
1679 | static | |
4993071a PP |
1680 | int lttng_match_enabler_star_glob(const char *desc_name, |
1681 | const char *pattern) | |
3c997079 | 1682 | { |
cbc19040 MD |
1683 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1684 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1685 | return 0; |
1686 | return 1; | |
1687 | } | |
1688 | ||
1689 | static | |
4ecb5ad5 MD |
1690 | int lttng_match_enabler_name(const char *desc_name, |
1691 | const char *name) | |
3c997079 | 1692 | { |
4ecb5ad5 | 1693 | if (strcmp(desc_name, name)) |
3c997079 MD |
1694 | return 0; |
1695 | return 1; | |
1696 | } | |
1697 | ||
3c997079 MD |
1698 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, |
1699 | struct lttng_enabler *enabler) | |
1700 | { | |
4ecb5ad5 | 1701 | const char *desc_name, *enabler_name; |
badfe9f5 | 1702 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1703 | |
1704 | enabler_name = enabler->event_param.name; | |
1705 | switch (enabler->event_param.instrumentation) { | |
1706 | case LTTNG_KERNEL_TRACEPOINT: | |
1707 | desc_name = desc->name; | |
3b861b22 FD |
1708 | switch (enabler->format_type) { |
1709 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1710 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1711 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1712 | return lttng_match_enabler_name(desc_name, enabler_name); |
1713 | default: | |
1714 | return -EINVAL; | |
1715 | } | |
4ecb5ad5 MD |
1716 | break; |
1717 | case LTTNG_KERNEL_SYSCALL: | |
1718 | desc_name = desc->name; | |
badfe9f5 | 1719 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1720 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1721 | compat = true; |
1722 | } | |
4ecb5ad5 MD |
1723 | if (!strncmp(desc_name, "syscall_exit_", |
1724 | strlen("syscall_exit_"))) { | |
1725 | desc_name += strlen("syscall_exit_"); | |
1726 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1727 | strlen("syscall_entry_"))) { | |
1728 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1729 | entry = true; |
4ecb5ad5 MD |
1730 | } else { |
1731 | WARN_ON_ONCE(1); | |
1732 | return -EINVAL; | |
1733 | } | |
badfe9f5 MD |
1734 | switch (enabler->event_param.u.syscall.entryexit) { |
1735 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1736 | break; | |
1737 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1738 | if (!entry) | |
1739 | return 0; | |
1740 | break; | |
1741 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1742 | if (entry) | |
1743 | return 0; | |
1744 | break; | |
1745 | default: | |
1746 | return -EINVAL; | |
1747 | } | |
1748 | switch (enabler->event_param.u.syscall.abi) { | |
1749 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1750 | break; | |
1751 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1752 | if (compat) | |
1753 | return 0; | |
1754 | break; | |
1755 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1756 | if (!compat) | |
1757 | return 0; | |
1758 | break; | |
1759 | default: | |
1760 | return -EINVAL; | |
1761 | } | |
1762 | switch (enabler->event_param.u.syscall.match) { | |
cff6938b | 1763 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1764 | switch (enabler->format_type) { |
1765 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1766 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1767 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1768 | return lttng_match_enabler_name(desc_name, enabler_name); |
1769 | default: | |
1770 | return -EINVAL; | |
1771 | } | |
1772 | break; | |
cff6938b | 1773 | case LTTNG_KERNEL_SYSCALL_MATCH_NR: |
badfe9f5 MD |
1774 | return -EINVAL; /* Not implemented. */ |
1775 | default: | |
1776 | return -EINVAL; | |
1777 | } | |
4ecb5ad5 MD |
1778 | break; |
1779 | default: | |
1780 | WARN_ON_ONCE(1); | |
1781 | return -EINVAL; | |
1782 | } | |
3c997079 MD |
1783 | } |
1784 | ||
1785 | static | |
b2bc0bc8 FD |
1786 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1787 | struct lttng_event *event) | |
3c997079 | 1788 | { |
b2bc0bc8 FD |
1789 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1790 | event_enabler); | |
1791 | ||
1792 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1793 | return 0; |
b2bc0bc8 FD |
1794 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1795 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1796 | return 1; |
1797 | else | |
1798 | return 0; | |
1799 | } | |
1800 | ||
b01155ba FD |
1801 | static |
1802 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1803 | struct lttng_event_notifier *event_notifier) | |
1804 | { | |
1805 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
1806 | event_notifier_enabler); | |
1807 | ||
1808 | if (base_enabler->event_param.instrumentation != event_notifier->instrumentation) | |
1809 | return 0; | |
1810 | if (lttng_desc_match_enabler(event_notifier->desc, base_enabler) | |
1811 | && event_notifier->group == event_notifier_enabler->group | |
1812 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1813 | return 1; | |
1814 | else | |
1815 | return 0; | |
1816 | } | |
1817 | ||
3c997079 | 1818 | static |
b2bc0bc8 FD |
1819 | struct lttng_enabler_ref *lttng_enabler_ref( |
1820 | struct list_head *enablers_ref_list, | |
3c997079 MD |
1821 | struct lttng_enabler *enabler) |
1822 | { | |
1823 | struct lttng_enabler_ref *enabler_ref; | |
1824 | ||
b2bc0bc8 | 1825 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
1826 | if (enabler_ref->ref == enabler) |
1827 | return enabler_ref; | |
1828 | } | |
1829 | return NULL; | |
1830 | } | |
1831 | ||
3c997079 | 1832 | static |
1b917d6b | 1833 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 1834 | { |
b2bc0bc8 | 1835 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
1836 | struct lttng_probe_desc *probe_desc; |
1837 | const struct lttng_event_desc *desc; | |
1838 | int i; | |
1839 | struct list_head *probe_list; | |
1840 | ||
1841 | probe_list = lttng_get_probe_list_head(); | |
1842 | /* | |
1843 | * For each probe event, if we find that a probe event matches | |
1844 | * our enabler, create an associated lttng_event if not | |
1845 | * already present. | |
1846 | */ | |
1847 | list_for_each_entry(probe_desc, probe_list, head) { | |
1848 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1849 | int found = 0; | |
1850 | struct hlist_head *head; | |
3c997079 MD |
1851 | struct lttng_event *event; |
1852 | ||
1853 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
1854 | if (!lttng_desc_match_enabler(desc, |
1855 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 1856 | continue; |
3c997079 MD |
1857 | |
1858 | /* | |
1859 | * Check if already created. | |
1860 | */ | |
4a11ef1c FD |
1861 | head = utils_borrow_hash_table_bucket( |
1862 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
1863 | desc->name); | |
d216ecae | 1864 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 1865 | if (event->desc == desc |
b2bc0bc8 | 1866 | && event->chan == event_enabler->chan) |
3c997079 MD |
1867 | found = 1; |
1868 | } | |
1869 | if (found) | |
1870 | continue; | |
1871 | ||
1872 | /* | |
1873 | * We need to create an event for this | |
1874 | * event probe. | |
1875 | */ | |
b2bc0bc8 | 1876 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
1877 | NULL, NULL, desc, |
1878 | LTTNG_KERNEL_TRACEPOINT); | |
1879 | if (!event) { | |
5a15f70c | 1880 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
1881 | probe_desc->event_desc[i]->name); |
1882 | } | |
1883 | } | |
1884 | } | |
1885 | } | |
1886 | ||
b01155ba FD |
1887 | static |
1888 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1889 | { | |
1890 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1891 | struct lttng_probe_desc *probe_desc; | |
1892 | const struct lttng_event_desc *desc; | |
1893 | int i; | |
1894 | struct list_head *probe_list; | |
1895 | ||
1896 | probe_list = lttng_get_probe_list_head(); | |
1897 | /* | |
1898 | * For each probe event, if we find that a probe event matches | |
1899 | * our enabler, create an associated lttng_event_notifier if not | |
1900 | * already present. | |
1901 | */ | |
1902 | list_for_each_entry(probe_desc, probe_list, head) { | |
1903 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1904 | int found = 0; | |
1905 | struct hlist_head *head; | |
1906 | struct lttng_event_notifier *event_notifier; | |
1907 | ||
1908 | desc = probe_desc->event_desc[i]; | |
1909 | if (!lttng_desc_match_enabler(desc, | |
1910 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1911 | continue; | |
1912 | ||
1913 | /* | |
1914 | * Check if already created. | |
1915 | */ | |
1916 | head = utils_borrow_hash_table_bucket( | |
1917 | event_notifier_group->event_notifiers_ht.table, | |
1918 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
1919 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1920 | if (event_notifier->desc == desc | |
1921 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1922 | found = 1; | |
1923 | } | |
1924 | if (found) | |
1925 | continue; | |
1926 | ||
1927 | /* | |
1928 | * We need to create a event_notifier for this event probe. | |
1929 | */ | |
1930 | event_notifier = _lttng_event_notifier_create(desc, | |
1931 | event_notifier_enabler->base.user_token, | |
1932 | event_notifier_group, NULL, NULL, | |
1933 | LTTNG_KERNEL_TRACEPOINT); | |
1934 | if (IS_ERR(event_notifier)) { | |
1935 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
1936 | probe_desc->event_desc[i]->name); | |
1937 | } | |
1938 | } | |
1939 | } | |
1940 | } | |
1941 | ||
33a39a3c | 1942 | static |
1b917d6b | 1943 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
1944 | { |
1945 | int ret; | |
1946 | ||
2d6d88c6 | 1947 | ret = lttng_syscalls_register_event(event_enabler->chan, NULL); |
33a39a3c MD |
1948 | WARN_ON_ONCE(ret); |
1949 | } | |
1950 | ||
8a8ac9a8 FD |
1951 | static |
1952 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1953 | { | |
1954 | int ret; | |
1955 | ||
1956 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL); | |
1957 | WARN_ON_ONCE(ret); | |
1958 | ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL); | |
1959 | WARN_ON_ONCE(ret); | |
1960 | } | |
1961 | ||
33a39a3c MD |
1962 | /* |
1963 | * Create struct lttng_event if it is missing and present in the list of | |
1964 | * tracepoint probes. | |
1965 | * Should be called with sessions mutex held. | |
1966 | */ | |
1967 | static | |
b2bc0bc8 | 1968 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 1969 | { |
b2bc0bc8 | 1970 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 1971 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 1972 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c MD |
1973 | break; |
1974 | case LTTNG_KERNEL_SYSCALL: | |
1b917d6b | 1975 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c MD |
1976 | break; |
1977 | default: | |
1978 | WARN_ON_ONCE(1); | |
1979 | break; | |
1980 | } | |
1981 | } | |
1982 | ||
3c997079 | 1983 | /* |
b2bc0bc8 | 1984 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
1985 | * and add backward reference from the event to the enabler. |
1986 | * Should be called with sessions mutex held. | |
1987 | */ | |
1988 | static | |
b2bc0bc8 | 1989 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 1990 | { |
b2bc0bc8 FD |
1991 | struct lttng_channel *chan = event_enabler->chan; |
1992 | struct lttng_session *session = event_enabler->chan->session; | |
1993 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
1994 | struct lttng_event *event; |
1995 | ||
b2bc0bc8 FD |
1996 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
1997 | base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && | |
1998 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
cff6938b | 1999 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && |
b2bc0bc8 FD |
2000 | !strcmp(base_enabler->event_param.name, "*")) { |
2001 | if (base_enabler->enabled) | |
badfe9f5 MD |
2002 | WRITE_ONCE(chan->syscall_all, 1); |
2003 | else | |
2004 | WRITE_ONCE(chan->syscall_all, 0); | |
2005 | } | |
2006 | ||
3c997079 | 2007 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2008 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2009 | |
b2bc0bc8 | 2010 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
2011 | list_for_each_entry(event, &session->events, list) { |
2012 | struct lttng_enabler_ref *enabler_ref; | |
2013 | ||
b2bc0bc8 | 2014 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 2015 | continue; |
b2bc0bc8 FD |
2016 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
2017 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
2018 | if (!enabler_ref) { |
2019 | /* | |
2020 | * If no backward ref, create it. | |
b2bc0bc8 | 2021 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2022 | */ |
2023 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2024 | if (!enabler_ref) | |
2025 | return -ENOMEM; | |
b2bc0bc8 | 2026 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
2027 | list_add(&enabler_ref->node, |
2028 | &event->enablers_ref_head); | |
2029 | } | |
2030 | ||
f127e61e MD |
2031 | /* |
2032 | * Link filter bytecodes if not linked yet. | |
2033 | */ | |
2dfda770 FD |
2034 | lttng_enabler_link_bytecode(event->desc, |
2035 | lttng_static_ctx, | |
183e8b3a | 2036 | &event->filter_bytecode_runtime_head, |
60206944 | 2037 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
f127e61e | 2038 | |
3c997079 MD |
2039 | /* TODO: merge event context. */ |
2040 | } | |
2041 | return 0; | |
2042 | } | |
2043 | ||
b01155ba FD |
2044 | /* |
2045 | * Create struct lttng_event_notifier if it is missing and present in the list of | |
2046 | * tracepoint probes. | |
2047 | * Should be called with sessions mutex held. | |
2048 | */ | |
2049 | static | |
2050 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2051 | { | |
2052 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
2053 | case LTTNG_KERNEL_TRACEPOINT: | |
2054 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); | |
2055 | break; | |
8a8ac9a8 FD |
2056 | case LTTNG_KERNEL_SYSCALL: |
2057 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); | |
2058 | break; | |
b01155ba FD |
2059 | default: |
2060 | WARN_ON_ONCE(1); | |
2061 | break; | |
2062 | } | |
2063 | } | |
2064 | ||
2065 | /* | |
2066 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2067 | */ | |
2068 | static | |
8a8ac9a8 FD |
2069 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2070 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2071 | { |
2072 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2073 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
b01155ba FD |
2074 | struct lttng_event_notifier *event_notifier; |
2075 | ||
8a8ac9a8 FD |
2076 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
2077 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
2078 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME && | |
2079 | !strcmp(base_enabler->event_param.name, "*")) { | |
2080 | ||
2081 | int enabled = base_enabler->enabled; | |
2082 | enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; | |
2083 | ||
2084 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2085 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); | |
2086 | ||
2087 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) | |
2088 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); | |
2089 | ||
2090 | } | |
2091 | ||
b01155ba FD |
2092 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2093 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2094 | ||
2095 | /* Link the created event_notifier with its associated enabler. */ | |
2096 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2097 | struct lttng_enabler_ref *enabler_ref; | |
2098 | ||
2099 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2100 | continue; | |
2101 | ||
2102 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
2103 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2104 | if (!enabler_ref) { | |
2105 | /* | |
2106 | * If no backward ref, create it. | |
2107 | * Add backward ref from event_notifier to enabler. | |
2108 | */ | |
2109 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2110 | if (!enabler_ref) | |
2111 | return -ENOMEM; | |
2112 | ||
2113 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2114 | event_notifier_enabler); | |
2115 | list_add(&enabler_ref->node, | |
2116 | &event_notifier->enablers_ref_head); | |
2117 | } | |
2118 | ||
2119 | /* | |
2120 | * Link filter bytecodes if not linked yet. | |
2121 | */ | |
2122 | lttng_enabler_link_bytecode(event_notifier->desc, | |
183e8b3a | 2123 | lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head, |
60206944 | 2124 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2125 | |
2126 | /* Link capture bytecodes if not linked yet. */ | |
2127 | lttng_enabler_link_bytecode(event_notifier->desc, | |
2128 | lttng_static_ctx, &event_notifier->capture_bytecode_runtime_head, | |
2129 | &event_notifier_enabler->capture_bytecode_head); | |
2130 | ||
2131 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
b01155ba FD |
2132 | } |
2133 | return 0; | |
2134 | } | |
2135 | ||
3c997079 MD |
2136 | /* |
2137 | * Called at module load: connect the probe on all enablers matching | |
2138 | * this event. | |
2139 | * Called with sessions lock held. | |
2140 | */ | |
2141 | int lttng_fix_pending_events(void) | |
2142 | { | |
2143 | struct lttng_session *session; | |
2144 | ||
2145 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 2146 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
2147 | return 0; |
2148 | } | |
2149 | ||
b01155ba FD |
2150 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2151 | struct lttng_event_notifier_group *event_notifier_group) | |
2152 | { | |
2153 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2154 | ||
2155 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2156 | node) { | |
2157 | if (event_notifier_enabler->base.enabled) | |
2158 | return true; | |
2159 | } | |
2160 | return false; | |
2161 | } | |
2162 | ||
2163 | bool lttng_event_notifier_active(void) | |
2164 | { | |
2165 | struct lttng_event_notifier_group *event_notifier_group; | |
2166 | ||
2167 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2168 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2169 | return true; | |
2170 | } | |
2171 | return false; | |
2172 | } | |
2173 | ||
2174 | int lttng_fix_pending_event_notifiers(void) | |
2175 | { | |
2176 | struct lttng_event_notifier_group *event_notifier_group; | |
2177 | ||
2178 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2179 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2180 | return 0; | |
2181 | } | |
2182 | ||
b2bc0bc8 FD |
2183 | struct lttng_event_enabler *lttng_event_enabler_create( |
2184 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
2185 | struct lttng_kernel_event *event_param, |
2186 | struct lttng_channel *chan) | |
2187 | { | |
b2bc0bc8 | 2188 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2189 | |
b2bc0bc8 FD |
2190 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2191 | if (!event_enabler) | |
3c997079 | 2192 | return NULL; |
b2bc0bc8 FD |
2193 | event_enabler->base.format_type = format_type; |
2194 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2195 | memcpy(&event_enabler->base.event_param, event_param, | |
2196 | sizeof(event_enabler->base.event_param)); | |
2197 | event_enabler->chan = chan; | |
3c997079 | 2198 | /* ctx left NULL */ |
b2bc0bc8 FD |
2199 | event_enabler->base.enabled = 0; |
2200 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 2201 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2202 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2203 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2204 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2205 | return event_enabler; |
3c997079 MD |
2206 | } |
2207 | ||
b2bc0bc8 | 2208 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2209 | { |
2210 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2211 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2212 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2213 | mutex_unlock(&sessions_mutex); |
2214 | return 0; | |
2215 | } | |
2216 | ||
b2bc0bc8 | 2217 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2218 | { |
2219 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2220 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2221 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2222 | mutex_unlock(&sessions_mutex); |
2223 | return 0; | |
2224 | } | |
2225 | ||
b2bc0bc8 | 2226 | static |
183e8b3a | 2227 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
07dfc1d0 MD |
2228 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2229 | { | |
89ec2b91 | 2230 | struct lttng_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2231 | uint32_t bytecode_len; |
2232 | int ret; | |
2233 | ||
2234 | ret = get_user(bytecode_len, &bytecode->len); | |
2235 | if (ret) | |
2236 | return ret; | |
52cfcdf3 | 2237 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2238 | GFP_KERNEL); |
2239 | if (!bytecode_node) | |
2240 | return -ENOMEM; | |
2241 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2242 | sizeof(*bytecode) + bytecode_len); | |
2243 | if (ret) | |
2244 | goto error_free; | |
b2bc0bc8 | 2245 | |
89ec2b91 | 2246 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER; |
07dfc1d0 MD |
2247 | bytecode_node->enabler = enabler; |
2248 | /* Enforce length based on allocated size */ | |
2249 | bytecode_node->bc.len = bytecode_len; | |
2250 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2251 | |
07dfc1d0 MD |
2252 | return 0; |
2253 | ||
2254 | error_free: | |
52cfcdf3 | 2255 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2256 | return ret; |
2257 | } | |
2258 | ||
183e8b3a | 2259 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
b2bc0bc8 FD |
2260 | struct lttng_kernel_filter_bytecode __user *bytecode) |
2261 | { | |
2262 | int ret; | |
183e8b3a | 2263 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2264 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2265 | if (ret) | |
2266 | goto error; | |
2267 | ||
2268 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2269 | return 0; | |
2270 | ||
2271 | error: | |
2272 | return ret; | |
2273 | } | |
2274 | ||
3aed4dca FD |
2275 | int lttng_event_add_callsite(struct lttng_event *event, |
2276 | struct lttng_kernel_event_callsite __user *callsite) | |
2277 | { | |
2278 | ||
2279 | switch (event->instrumentation) { | |
2280 | case LTTNG_KERNEL_UPROBE: | |
83b802dc | 2281 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2282 | default: |
2283 | return -EINVAL; | |
2284 | } | |
2285 | } | |
2286 | ||
b2bc0bc8 | 2287 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
2288 | struct lttng_kernel_context *context_param) |
2289 | { | |
2290 | return -ENOSYS; | |
2291 | } | |
2292 | ||
2293 | static | |
2294 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2295 | { | |
89ec2b91 | 2296 | struct lttng_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2297 | |
2298 | /* Destroy filter bytecode */ | |
2299 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2300 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2301 | lttng_kvfree(filter_node); |
07dfc1d0 | 2302 | } |
b2bc0bc8 FD |
2303 | } |
2304 | ||
2305 | static | |
2306 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2307 | { | |
2308 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2309 | |
3c997079 | 2310 | /* Destroy contexts */ |
b2bc0bc8 | 2311 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 2312 | |
b2bc0bc8 FD |
2313 | list_del(&event_enabler->node); |
2314 | kfree(event_enabler); | |
3c997079 MD |
2315 | } |
2316 | ||
dffef45d FD |
2317 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2318 | struct lttng_event_notifier_group *event_notifier_group, | |
2319 | enum lttng_enabler_format_type format_type, | |
2320 | struct lttng_kernel_event_notifier *event_notifier_param) | |
2321 | { | |
2322 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2323 | ||
2324 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2325 | if (!event_notifier_enabler) | |
2326 | return NULL; | |
2327 | ||
2328 | event_notifier_enabler->base.format_type = format_type; | |
2329 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2330 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2331 | ||
2332 | event_notifier_enabler->num_captures = 0; | |
dffef45d | 2333 | |
8a8ac9a8 FD |
2334 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2335 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2336 | event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER; |
2337 | ||
2338 | event_notifier_enabler->base.enabled = 0; | |
2339 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2340 | event_notifier_enabler->group = event_notifier_group; | |
2341 | ||
2342 | mutex_lock(&sessions_mutex); | |
2343 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2344 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2345 | |
2346 | mutex_unlock(&sessions_mutex); | |
2347 | ||
2348 | return event_notifier_enabler; | |
2349 | } | |
2350 | ||
2351 | int lttng_event_notifier_enabler_enable( | |
2352 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2353 | { | |
2354 | mutex_lock(&sessions_mutex); | |
2355 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2356 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2357 | mutex_unlock(&sessions_mutex); |
2358 | return 0; | |
2359 | } | |
2360 | ||
2361 | int lttng_event_notifier_enabler_disable( | |
2362 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2363 | { | |
2364 | mutex_lock(&sessions_mutex); | |
2365 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2366 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2367 | mutex_unlock(&sessions_mutex); |
2368 | return 0; | |
2369 | } | |
2370 | ||
183e8b3a | 2371 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d FD |
2372 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
2373 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2374 | { | |
2375 | int ret; | |
2376 | ||
183e8b3a | 2377 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2378 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2379 | bytecode); | |
2380 | if (ret) | |
2381 | goto error; | |
2382 | ||
b01155ba | 2383 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2384 | return 0; |
2385 | ||
2386 | error: | |
2387 | return ret; | |
2388 | } | |
2389 | ||
99d223ad FD |
2390 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2391 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2392 | struct lttng_kernel_capture_bytecode __user *bytecode) | |
2393 | { | |
2394 | struct lttng_bytecode_node *bytecode_node; | |
2395 | struct lttng_enabler *enabler = | |
2396 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2397 | uint32_t bytecode_len; | |
2398 | int ret; | |
2399 | ||
2400 | ret = get_user(bytecode_len, &bytecode->len); | |
2401 | if (ret) | |
2402 | return ret; | |
2403 | ||
2404 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2405 | GFP_KERNEL); | |
2406 | if (!bytecode_node) | |
2407 | return -ENOMEM; | |
2408 | ||
2409 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2410 | sizeof(*bytecode) + bytecode_len); | |
2411 | if (ret) | |
2412 | goto error_free; | |
2413 | ||
2414 | bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE; | |
2415 | bytecode_node->enabler = enabler; | |
2416 | ||
2417 | /* Enforce length based on allocated size */ | |
2418 | bytecode_node->bc.len = bytecode_len; | |
2419 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2420 | ||
2421 | event_notifier_enabler->num_captures++; | |
2422 | ||
2423 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2424 | goto end; | |
2425 | ||
2426 | error_free: | |
2427 | lttng_kvfree(bytecode_node); | |
2428 | end: | |
2429 | return ret; | |
2430 | } | |
2431 | ||
9de67196 FD |
2432 | int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier, |
2433 | struct lttng_kernel_event_callsite __user *callsite) | |
2434 | { | |
2435 | ||
2436 | switch (event_notifier->instrumentation) { | |
2437 | case LTTNG_KERNEL_UPROBE: | |
2438 | return lttng_uprobes_event_notifier_add_callsite(event_notifier, | |
2439 | callsite); | |
2440 | default: | |
2441 | return -EINVAL; | |
2442 | } | |
2443 | } | |
2444 | ||
dffef45d FD |
2445 | int lttng_event_notifier_enabler_attach_context( |
2446 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2447 | struct lttng_kernel_context *context_param) | |
2448 | { | |
2449 | return -ENOSYS; | |
2450 | } | |
2451 | ||
2452 | static | |
2453 | void lttng_event_notifier_enabler_destroy( | |
2454 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2455 | { | |
2456 | if (!event_notifier_enabler) { | |
2457 | return; | |
2458 | } | |
2459 | ||
2460 | list_del(&event_notifier_enabler->node); | |
2461 | ||
2462 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2463 | kfree(event_notifier_enabler); | |
2464 | } | |
2465 | ||
3c997079 | 2466 | /* |
b2bc0bc8 | 2467 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2468 | * session. |
2469 | * Should be called with sessions mutex held. | |
2470 | */ | |
2471 | static | |
b2bc0bc8 | 2472 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2473 | { |
b2bc0bc8 | 2474 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2475 | struct lttng_event *event; |
2476 | ||
b2bc0bc8 FD |
2477 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2478 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2479 | /* |
2480 | * For each event, if at least one of its enablers is enabled, | |
2481 | * and its channel and session transient states are enabled, we | |
2482 | * enable the event, else we disable it. | |
2483 | */ | |
2484 | list_for_each_entry(event, &session->events, list) { | |
2485 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
2486 | struct lttng_bytecode_runtime *runtime; |
2487 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2488 | |
4ecb5ad5 MD |
2489 | switch (event->instrumentation) { |
2490 | case LTTNG_KERNEL_TRACEPOINT: | |
2491 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
2492 | /* Enable events */ |
2493 | list_for_each_entry(enabler_ref, | |
2494 | &event->enablers_ref_head, node) { | |
2495 | if (enabler_ref->ref->enabled) { | |
2496 | enabled = 1; | |
2497 | break; | |
2498 | } | |
2499 | } | |
4ecb5ad5 MD |
2500 | break; |
2501 | default: | |
3c997079 MD |
2502 | /* Not handled with lazy sync. */ |
2503 | continue; | |
2504 | } | |
2505 | /* | |
2506 | * Enabled state is based on union of enablers, with | |
2507 | * intesection of session and channel transient enable | |
2508 | * states. | |
2509 | */ | |
2510 | enabled = enabled && session->tstate && event->chan->tstate; | |
2511 | ||
a8f2d0c7 | 2512 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
2513 | /* |
2514 | * Sync tracepoint registration with event enabled | |
2515 | * state. | |
2516 | */ | |
2517 | if (enabled) { | |
2518 | register_event(event); | |
2519 | } else { | |
2520 | _lttng_event_unregister(event); | |
2521 | } | |
07dfc1d0 MD |
2522 | |
2523 | /* Check if has enablers without bytecode enabled */ | |
2524 | list_for_each_entry(enabler_ref, | |
2525 | &event->enablers_ref_head, node) { | |
2526 | if (enabler_ref->ref->enabled | |
2527 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2528 | has_enablers_without_bytecode = 1; | |
2529 | break; | |
2530 | } | |
2531 | } | |
2532 | event->has_enablers_without_bytecode = | |
2533 | has_enablers_without_bytecode; | |
2534 | ||
2535 | /* Enable filters */ | |
2536 | list_for_each_entry(runtime, | |
183e8b3a | 2537 | &event->filter_bytecode_runtime_head, node) |
0b365677 | 2538 | lttng_bytecode_filter_sync_state(runtime); |
3c997079 MD |
2539 | } |
2540 | } | |
2541 | ||
2542 | /* | |
2543 | * Apply enablers to session events, adding events to session if need | |
2544 | * be. It is required after each modification applied to an active | |
2545 | * session, and right before session "start". | |
2546 | * "lazy" sync means we only sync if required. | |
2547 | * Should be called with sessions mutex held. | |
2548 | */ | |
2549 | static | |
b2bc0bc8 | 2550 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2551 | { |
2552 | /* We can skip if session is not active */ | |
2553 | if (!session->active) | |
2554 | return; | |
b2bc0bc8 | 2555 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2556 | } |
2557 | ||
b01155ba FD |
2558 | static |
2559 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2560 | { | |
2561 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2562 | struct lttng_event_notifier *event_notifier; | |
2563 | ||
2564 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2565 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2566 | ||
2567 | /* | |
2568 | * For each event_notifier, if at least one of its enablers is enabled, | |
2569 | * we enable the event_notifier, else we disable it. | |
2570 | */ | |
2571 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2572 | struct lttng_enabler_ref *enabler_ref; | |
2573 | struct lttng_bytecode_runtime *runtime; | |
2574 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2575 | ||
2576 | switch (event_notifier->instrumentation) { | |
2577 | case LTTNG_KERNEL_TRACEPOINT: | |
2578 | case LTTNG_KERNEL_SYSCALL: | |
2579 | /* Enable event_notifiers */ | |
2580 | list_for_each_entry(enabler_ref, | |
2581 | &event_notifier->enablers_ref_head, node) { | |
2582 | if (enabler_ref->ref->enabled) { | |
2583 | enabled = 1; | |
2584 | break; | |
2585 | } | |
2586 | } | |
2587 | break; | |
2588 | default: | |
2589 | /* Not handled with sync. */ | |
2590 | continue; | |
2591 | } | |
2592 | ||
2593 | WRITE_ONCE(event_notifier->enabled, enabled); | |
2594 | /* | |
2595 | * Sync tracepoint registration with event_notifier enabled | |
2596 | * state. | |
2597 | */ | |
2598 | if (enabled) { | |
2599 | if (!event_notifier->registered) | |
2600 | register_event_notifier(event_notifier); | |
2601 | } else { | |
2602 | if (event_notifier->registered) | |
2603 | _lttng_event_notifier_unregister(event_notifier); | |
2604 | } | |
2605 | ||
2606 | /* Check if has enablers without bytecode enabled */ | |
2607 | list_for_each_entry(enabler_ref, | |
2608 | &event_notifier->enablers_ref_head, node) { | |
2609 | if (enabler_ref->ref->enabled | |
2610 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2611 | has_enablers_without_bytecode = 1; | |
2612 | break; | |
2613 | } | |
2614 | } | |
2615 | event_notifier->has_enablers_without_bytecode = | |
2616 | has_enablers_without_bytecode; | |
2617 | ||
2618 | /* Enable filters */ | |
2619 | list_for_each_entry(runtime, | |
183e8b3a | 2620 | &event_notifier->filter_bytecode_runtime_head, node) |
0b365677 | 2621 | lttng_bytecode_filter_sync_state(runtime); |
99d223ad FD |
2622 | |
2623 | /* Enable captures */ | |
2624 | list_for_each_entry(runtime, | |
2625 | &event_notifier->capture_bytecode_runtime_head, node) | |
2626 | lttng_bytecode_capture_sync_state(runtime); | |
b01155ba FD |
2627 | } |
2628 | } | |
2629 | ||
1ec3f75a | 2630 | /* |
d83004aa JD |
2631 | * Serialize at most one packet worth of metadata into a metadata |
2632 | * channel. | |
92d9f5e6 MD |
2633 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2634 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2635 | * allows us to do racy operations such as looking for remaining space left in | |
2636 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2637 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2638 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2639 | * Returns the number of bytes written in the channel, 0 if no data |
2640 | * was written and a negative value on error. | |
1ec3f75a | 2641 | */ |
b3b8072b | 2642 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2643 | struct channel *chan, bool *coherent) |
d83004aa JD |
2644 | { |
2645 | struct lib_ring_buffer_ctx ctx; | |
2646 | int ret = 0; | |
2647 | size_t len, reserve_len; | |
2648 | ||
f613e3e6 | 2649 | /* |
92d9f5e6 MD |
2650 | * Ensure we support mutiple get_next / put sequences followed by |
2651 | * put_next. The metadata cache lock protects reading the metadata | |
2652 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2653 | * "flush" operations on the buffer invoked by different processes. | |
2654 | * Moreover, since the metadata cache memory can be reallocated, we | |
2655 | * need to have exclusive access against updates even though we only | |
2656 | * read it. | |
f613e3e6 | 2657 | */ |
92d9f5e6 | 2658 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2659 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2660 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2661 | goto end; |
f613e3e6 | 2662 | |
9616f0bf JD |
2663 | /* Metadata regenerated, change the version. */ |
2664 | if (stream->metadata_cache->version != stream->version) | |
2665 | stream->version = stream->metadata_cache->version; | |
2666 | ||
d83004aa | 2667 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2668 | stream->metadata_in; |
9de2c215 | 2669 | if (!len) |
de23d59d | 2670 | goto end; |
d83004aa | 2671 | reserve_len = min_t(size_t, |
b3b8072b | 2672 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2673 | len); |
b3b8072b | 2674 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2675 | sizeof(char), -1); |
2676 | /* | |
2677 | * If reservation failed, return an error to the caller. | |
2678 | */ | |
b3b8072b | 2679 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2680 | if (ret != 0) { |
2681 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2682 | stream->coherent = false; |
d83004aa JD |
2683 | goto end; |
2684 | } | |
b3b8072b | 2685 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2686 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2687 | reserve_len); |
b3b8072b | 2688 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2689 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2690 | if (reserve_len < len) |
8b97fd42 MD |
2691 | stream->coherent = false; |
2692 | else | |
2693 | stream->coherent = true; | |
d83004aa JD |
2694 | ret = reserve_len; |
2695 | ||
2696 | end: | |
8b97fd42 MD |
2697 | if (coherent) |
2698 | *coherent = stream->coherent; | |
92d9f5e6 | 2699 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2700 | return ret; |
2701 | } | |
2702 | ||
8b97fd42 MD |
2703 | static |
2704 | void lttng_metadata_begin(struct lttng_session *session) | |
2705 | { | |
3e75e2a7 MD |
2706 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2707 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2708 | } |
2709 | ||
2710 | static | |
2711 | void lttng_metadata_end(struct lttng_session *session) | |
2712 | { | |
3e75e2a7 MD |
2713 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2714 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2715 | struct lttng_metadata_stream *stream; | |
2716 | ||
3e75e2a7 MD |
2717 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2718 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2719 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2720 | } |
8b97fd42 MD |
2721 | } |
2722 | ||
d83004aa JD |
2723 | /* |
2724 | * Write the metadata to the metadata cache. | |
2725 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2726 | * The metadata cache lock protects us from concurrent read access from |
2727 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2728 | * The content of the printf is printed as a single atomic metadata |
2729 | * transaction. | |
d83004aa | 2730 | */ |
a90917c3 | 2731 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2732 | const char *fmt, ...) |
2733 | { | |
c099397a | 2734 | char *str; |
d83004aa | 2735 | size_t len; |
c099397a MD |
2736 | va_list ap; |
2737 | ||
585e5dcc | 2738 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2739 | |
2740 | va_start(ap, fmt); | |
2741 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2742 | va_end(ap); | |
2743 | if (!str) | |
2744 | return -ENOMEM; | |
2745 | ||
1ec3f75a | 2746 | len = strlen(str); |
3e75e2a7 | 2747 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2748 | if (session->metadata_cache->metadata_written + len > |
2749 | session->metadata_cache->cache_alloc) { | |
2750 | char *tmp_cache_realloc; | |
2751 | unsigned int tmp_cache_alloc_size; | |
2752 | ||
2753 | tmp_cache_alloc_size = max_t(unsigned int, | |
2754 | session->metadata_cache->cache_alloc + len, | |
2755 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2756 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2757 | if (!tmp_cache_realloc) |
2758 | goto err; | |
a606b6e8 ML |
2759 | if (session->metadata_cache->data) { |
2760 | memcpy(tmp_cache_realloc, | |
2761 | session->metadata_cache->data, | |
2762 | session->metadata_cache->cache_alloc); | |
2763 | vfree(session->metadata_cache->data); | |
2764 | } | |
2765 | ||
d83004aa JD |
2766 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2767 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2768 | } |
d83004aa JD |
2769 | memcpy(session->metadata_cache->data + |
2770 | session->metadata_cache->metadata_written, | |
2771 | str, len); | |
2772 | session->metadata_cache->metadata_written += len; | |
c099397a | 2773 | kfree(str); |
d83004aa | 2774 | |
d83004aa JD |
2775 | return 0; |
2776 | ||
2777 | err: | |
2778 | kfree(str); | |
2779 | return -ENOMEM; | |
c099397a MD |
2780 | } |
2781 | ||
f513b2bf MD |
2782 | static |
2783 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2784 | { | |
2785 | size_t i; | |
2786 | ||
2787 | for (i = 0; i < nesting; i++) { | |
2788 | int ret; | |
2789 | ||
2790 | ret = lttng_metadata_printf(session, " "); | |
2791 | if (ret) { | |
2792 | return ret; | |
2793 | } | |
2794 | } | |
2795 | return 0; | |
2796 | } | |
2797 | ||
ceabb767 MD |
2798 | static |
2799 | int lttng_field_name_statedump(struct lttng_session *session, | |
2800 | const struct lttng_event_field *field, | |
2801 | size_t nesting) | |
2802 | { | |
2803 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2804 | } | |
2805 | ||
2806 | static | |
2807 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
2808 | const struct lttng_type *type, | |
2809 | size_t nesting) | |
2810 | { | |
2811 | int ret; | |
2812 | ||
2813 | WARN_ON_ONCE(type->atype != atype_integer); | |
2814 | ret = print_tabs(session, nesting); | |
2815 | if (ret) | |
2816 | return ret; | |
2817 | ret = lttng_metadata_printf(session, | |
2818 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
2819 | type->u.integer.size, | |
2820 | type->u.integer.alignment, | |
2821 | type->u.integer.signedness, | |
2822 | (type->u.integer.encoding == lttng_encode_none) | |
2823 | ? "none" | |
2824 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
2825 | ? "UTF8" | |
2826 | : "ASCII", | |
2827 | type->u.integer.base, | |
2828 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2829 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
2830 | #else | |
2831 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
2832 | #endif | |
2833 | ); | |
2834 | return ret; | |
2835 | } | |
2836 | ||
f513b2bf MD |
2837 | /* |
2838 | * Must be called with sessions_mutex held. | |
2839 | */ | |
2840 | static | |
2841 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
2842 | const struct lttng_type *type, | |
2843 | size_t nesting) | |
2844 | { | |
2845 | int ret; | |
2846 | uint32_t i, nr_fields; | |
ceabb767 MD |
2847 | unsigned int alignment; |
2848 | ||
2849 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
2850 | |
2851 | ret = print_tabs(session, nesting); | |
2852 | if (ret) | |
2853 | return ret; | |
2854 | ret = lttng_metadata_printf(session, | |
2855 | "struct {\n"); | |
2856 | if (ret) | |
2857 | return ret; | |
ceabb767 | 2858 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
2859 | for (i = 0; i < nr_fields; i++) { |
2860 | const struct lttng_event_field *iter_field; | |
2861 | ||
ceabb767 | 2862 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
2863 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2864 | if (ret) | |
2865 | return ret; | |
2866 | } | |
2867 | ret = print_tabs(session, nesting); | |
2868 | if (ret) | |
2869 | return ret; | |
ceabb767 MD |
2870 | alignment = type->u.struct_nestable.alignment; |
2871 | if (alignment) { | |
2872 | ret = lttng_metadata_printf(session, | |
2873 | "} align(%u)", | |
2874 | alignment); | |
2875 | } else { | |
2876 | ret = lttng_metadata_printf(session, | |
2877 | "}"); | |
2878 | } | |
f513b2bf MD |
2879 | return ret; |
2880 | } | |
2881 | ||
2882 | /* | |
2883 | * Must be called with sessions_mutex held. | |
2884 | */ | |
2885 | static | |
ceabb767 | 2886 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2887 | const struct lttng_event_field *field, |
2888 | size_t nesting) | |
2889 | { | |
2890 | int ret; | |
2891 | ||
2892 | ret = _lttng_struct_type_statedump(session, | |
2893 | &field->type, nesting); | |
2894 | if (ret) | |
2895 | return ret; | |
ceabb767 | 2896 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2897 | } |
2898 | ||
65c85aa6 MD |
2899 | /* |
2900 | * Must be called with sessions_mutex held. | |
2901 | */ | |
2902 | static | |
2903 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
2904 | const struct lttng_type *type, | |
2905 | size_t nesting) | |
2906 | { | |
2907 | int ret; | |
2908 | uint32_t i, nr_choices; | |
2909 | ||
ceabb767 MD |
2910 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
2911 | /* | |
2912 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
2913 | */ | |
2914 | if (type->u.variant_nestable.alignment != 0) | |
2915 | return -EINVAL; | |
65c85aa6 MD |
2916 | ret = print_tabs(session, nesting); |
2917 | if (ret) | |
2918 | return ret; | |
2919 | ret = lttng_metadata_printf(session, | |
2920 | "variant <_%s> {\n", | |
ceabb767 | 2921 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
2922 | if (ret) |
2923 | return ret; | |
ceabb767 | 2924 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
2925 | for (i = 0; i < nr_choices; i++) { |
2926 | const struct lttng_event_field *iter_field; | |
2927 | ||
ceabb767 | 2928 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
2929 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2930 | if (ret) | |
2931 | return ret; | |
2932 | } | |
2933 | ret = print_tabs(session, nesting); | |
2934 | if (ret) | |
2935 | return ret; | |
2936 | ret = lttng_metadata_printf(session, | |
2937 | "}"); | |
2938 | return ret; | |
2939 | } | |
2940 | ||
2941 | /* | |
2942 | * Must be called with sessions_mutex held. | |
2943 | */ | |
2944 | static | |
ceabb767 | 2945 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
2946 | const struct lttng_event_field *field, |
2947 | size_t nesting) | |
2948 | { | |
2949 | int ret; | |
2950 | ||
2951 | ret = _lttng_variant_type_statedump(session, | |
2952 | &field->type, nesting); | |
2953 | if (ret) | |
2954 | return ret; | |
ceabb767 | 2955 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
2956 | } |
2957 | ||
f513b2bf MD |
2958 | /* |
2959 | * Must be called with sessions_mutex held. | |
2960 | */ | |
2961 | static | |
ceabb767 | 2962 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2963 | const struct lttng_event_field *field, |
2964 | size_t nesting) | |
2965 | { | |
2966 | int ret; | |
2967 | const struct lttng_type *elem_type; | |
2968 | ||
ceabb767 MD |
2969 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
2970 | ||
2971 | if (field->type.u.array_nestable.alignment) { | |
2972 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2973 | if (ret) |
2974 | return ret; | |
ceabb767 MD |
2975 | ret = lttng_metadata_printf(session, |
2976 | "struct { } align(%u) _%s_padding;\n", | |
2977 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
2978 | field->name); | |
2979 | if (ret) | |
2980 | return ret; | |
2981 | } | |
2982 | /* | |
2983 | * Nested compound types: Only array of structures and variants are | |
2984 | * currently supported. | |
2985 | */ | |
2986 | elem_type = field->type.u.array_nestable.elem_type; | |
2987 | switch (elem_type->atype) { | |
2988 | case atype_integer: | |
2989 | case atype_struct_nestable: | |
2990 | case atype_variant_nestable: | |
2991 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2992 | if (ret) |
2993 | return ret; | |
2994 | break; | |
ceabb767 | 2995 | |
f513b2bf MD |
2996 | default: |
2997 | return -EINVAL; | |
2998 | } | |
2999 | ret = lttng_metadata_printf(session, | |
3000 | " _%s[%u];\n", | |
3001 | field->name, | |
ceabb767 | 3002 | field->type.u.array_nestable.length); |
f513b2bf MD |
3003 | return ret; |
3004 | } | |
3005 | ||
3006 | /* | |
3007 | * Must be called with sessions_mutex held. | |
3008 | */ | |
3009 | static | |
ceabb767 | 3010 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
3011 | const struct lttng_event_field *field, |
3012 | size_t nesting) | |
3013 | { | |
3014 | int ret; | |
3015 | const char *length_name; | |
3016 | const struct lttng_type *elem_type; | |
3017 | ||
ceabb767 | 3018 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 3019 | |
ceabb767 MD |
3020 | length_name = field->type.u.sequence_nestable.length_name; |
3021 | ||
3022 | if (field->type.u.sequence_nestable.alignment) { | |
3023 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
3024 | if (ret) |
3025 | return ret; | |
ceabb767 MD |
3026 | ret = lttng_metadata_printf(session, |
3027 | "struct { } align(%u) _%s_padding;\n", | |
3028 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
3029 | field->name); | |
3030 | if (ret) | |
3031 | return ret; | |
3032 | } | |
3033 | ||
3034 | /* | |
3035 | * Nested compound types: Only array of structures and variants are | |
3036 | * currently supported. | |
3037 | */ | |
3038 | elem_type = field->type.u.sequence_nestable.elem_type; | |
3039 | switch (elem_type->atype) { | |
3040 | case atype_integer: | |
3041 | case atype_struct_nestable: | |
3042 | case atype_variant_nestable: | |
3043 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
3044 | if (ret) |
3045 | return ret; | |
3046 | break; | |
ceabb767 | 3047 | |
f513b2bf MD |
3048 | default: |
3049 | return -EINVAL; | |
3050 | } | |
3051 | ret = lttng_metadata_printf(session, | |
3052 | " _%s[ _%s ];\n", | |
3053 | field->name, | |
ceabb767 | 3054 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
3055 | return ret; |
3056 | } | |
3057 | ||
141ddf28 MD |
3058 | /* |
3059 | * Must be called with sessions_mutex held. | |
3060 | */ | |
3061 | static | |
ceabb767 MD |
3062 | int _lttng_enum_type_statedump(struct lttng_session *session, |
3063 | const struct lttng_type *type, | |
141ddf28 MD |
3064 | size_t nesting) |
3065 | { | |
3066 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 3067 | const struct lttng_type *container_type; |
141ddf28 MD |
3068 | int ret; |
3069 | unsigned int i, nr_entries; | |
3070 | ||
ceabb767 MD |
3071 | container_type = type->u.enum_nestable.container_type; |
3072 | if (container_type->atype != atype_integer) { | |
3073 | ret = -EINVAL; | |
3074 | goto end; | |
3075 | } | |
3076 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
3077 | nr_entries = enum_desc->nr_entries; |
3078 | ||
3079 | ret = print_tabs(session, nesting); | |
3080 | if (ret) | |
3081 | goto end; | |
ceabb767 MD |
3082 | ret = lttng_metadata_printf(session, "enum : "); |
3083 | if (ret) | |
3084 | goto end; | |
3085 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 3086 | if (ret) |
ceabb767 MD |
3087 | goto end; |
3088 | ret = lttng_metadata_printf(session, " {\n"); | |
3089 | if (ret) | |
3090 | goto end; | |
141ddf28 MD |
3091 | /* Dump all entries */ |
3092 | for (i = 0; i < nr_entries; i++) { | |
3093 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
3094 | int j, len; | |
3095 | ||
3096 | ret = print_tabs(session, nesting + 1); | |
3097 | if (ret) | |
3098 | goto end; | |
3099 | ret = lttng_metadata_printf(session, | |
3100 | "\""); | |
3101 | if (ret) | |
3102 | goto end; | |
3103 | len = strlen(entry->string); | |
3104 | /* Escape the character '"' */ | |
3105 | for (j = 0; j < len; j++) { | |
3106 | char c = entry->string[j]; | |
3107 | ||
3108 | switch (c) { | |
3109 | case '"': | |
3110 | ret = lttng_metadata_printf(session, | |
3111 | "\\\""); | |
3112 | break; | |
3113 | case '\\': | |
3114 | ret = lttng_metadata_printf(session, | |
3115 | "\\\\"); | |
3116 | break; | |
3117 | default: | |
3118 | ret = lttng_metadata_printf(session, | |
3119 | "%c", c); | |
3120 | break; | |
3121 | } | |
3122 | if (ret) | |
3123 | goto end; | |
3124 | } | |
08ad1061 PP |
3125 | ret = lttng_metadata_printf(session, "\""); |
3126 | if (ret) | |
3127 | goto end; | |
3128 | ||
3129 | if (entry->options.is_auto) { | |
3130 | ret = lttng_metadata_printf(session, ",\n"); | |
3131 | if (ret) | |
3132 | goto end; | |
141ddf28 | 3133 | } else { |
7c559490 MD |
3134 | ret = lttng_metadata_printf(session, |
3135 | " = "); | |
3136 | if (ret) | |
3137 | goto end; | |
3138 | if (entry->start.signedness) | |
141ddf28 | 3139 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3140 | "%lld", (long long) entry->start.value); |
3141 | else | |
3142 | ret = lttng_metadata_printf(session, | |
3143 | "%llu", entry->start.value); | |
3144 | if (ret) | |
3145 | goto end; | |
3146 | if (entry->start.signedness == entry->end.signedness && | |
3147 | entry->start.value | |
3148 | == entry->end.value) { | |
141ddf28 | 3149 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3150 | ",\n"); |
3151 | } else { | |
3152 | if (entry->end.signedness) { | |
3153 | ret = lttng_metadata_printf(session, | |
3154 | " ... %lld,\n", | |
3155 | (long long) entry->end.value); | |
3156 | } else { | |
3157 | ret = lttng_metadata_printf(session, | |
3158 | " ... %llu,\n", | |
3159 | entry->end.value); | |
3160 | } | |
141ddf28 | 3161 | } |
7c559490 MD |
3162 | if (ret) |
3163 | goto end; | |
141ddf28 | 3164 | } |
141ddf28 MD |
3165 | } |
3166 | ret = print_tabs(session, nesting); | |
3167 | if (ret) | |
3168 | goto end; | |
ceabb767 | 3169 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3170 | end: |
3171 | return ret; | |
3172 | } | |
3173 | ||
d83004aa JD |
3174 | /* |
3175 | * Must be called with sessions_mutex held. | |
3176 | */ | |
c099397a | 3177 | static |
ceabb767 MD |
3178 | int _lttng_enum_field_statedump(struct lttng_session *session, |
3179 | const struct lttng_event_field *field, | |
3180 | size_t nesting) | |
3181 | { | |
3182 | int ret; | |
3183 | ||
3184 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
3185 | if (ret) | |
3186 | return ret; | |
3187 | return lttng_field_name_statedump(session, field, nesting); | |
3188 | } | |
3189 | ||
3190 | static | |
3191 | int _lttng_integer_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_integer_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_string_type_statedump(struct lttng_session *session, | |
3205 | const struct lttng_type *type, | |
3206 | size_t nesting) | |
3207 | { | |
3208 | int ret; | |
3209 | ||
3210 | WARN_ON_ONCE(type->atype != atype_string); | |
3211 | /* Default encoding is UTF8 */ | |
3212 | ret = print_tabs(session, nesting); | |
3213 | if (ret) | |
3214 | return ret; | |
3215 | ret = lttng_metadata_printf(session, | |
3216 | "string%s", | |
3217 | type->u.string.encoding == lttng_encode_ASCII ? | |
3218 | " { encoding = ASCII; }" : ""); | |
3219 | return ret; | |
3220 | } | |
3221 | ||
3222 | static | |
3223 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
3224 | const struct lttng_event_field *field, |
3225 | size_t nesting) | |
ceabb767 MD |
3226 | { |
3227 | int ret; | |
3228 | ||
3229 | WARN_ON_ONCE(field->type.atype != atype_string); | |
3230 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
3231 | if (ret) | |
3232 | return ret; | |
3233 | return lttng_field_name_statedump(session, field, nesting); | |
3234 | } | |
3235 | ||
3236 | /* | |
3237 | * Must be called with sessions_mutex held. | |
3238 | */ | |
3239 | static | |
3240 | int _lttng_type_statedump(struct lttng_session *session, | |
3241 | const struct lttng_type *type, | |
3242 | size_t nesting) | |
c099397a | 3243 | { |
c099397a | 3244 | int ret = 0; |
c099397a | 3245 | |
ceabb767 | 3246 | switch (type->atype) { |
8070f5c0 | 3247 | case atype_integer: |
ceabb767 | 3248 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 3249 | break; |
ceabb767 MD |
3250 | case atype_enum_nestable: |
3251 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 3252 | break; |
ceabb767 MD |
3253 | case atype_string: |
3254 | ret = _lttng_string_type_statedump(session, type, nesting); | |
3255 | break; | |
3256 | case atype_struct_nestable: | |
3257 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 3258 | break; |
ceabb767 MD |
3259 | case atype_variant_nestable: |
3260 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
3261 | break; | |
3262 | ||
3263 | /* Nested arrays and sequences are not supported yet. */ | |
3264 | case atype_array_nestable: | |
3265 | case atype_sequence_nestable: | |
3266 | default: | |
3267 | WARN_ON_ONCE(1); | |
3268 | return -EINVAL; | |
8070f5c0 | 3269 | } |
ceabb767 MD |
3270 | return ret; |
3271 | } | |
8070f5c0 | 3272 | |
ceabb767 MD |
3273 | /* |
3274 | * Must be called with sessions_mutex held. | |
3275 | */ | |
3276 | static | |
3277 | int _lttng_field_statedump(struct lttng_session *session, | |
3278 | const struct lttng_event_field *field, | |
3279 | size_t nesting) | |
3280 | { | |
3281 | int ret = 0; | |
27d2368e | 3282 | |
ceabb767 MD |
3283 | switch (field->type.atype) { |
3284 | case atype_integer: | |
3285 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
3286 | break; | |
3287 | case atype_enum_nestable: | |
3288 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 3289 | break; |
8070f5c0 | 3290 | case atype_string: |
ceabb767 | 3291 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3292 | break; |
ceabb767 MD |
3293 | case atype_struct_nestable: |
3294 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 3295 | break; |
ceabb767 MD |
3296 | case atype_array_nestable: |
3297 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 3298 | break; |
ceabb767 MD |
3299 | case atype_sequence_nestable: |
3300 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 3301 | break; |
ceabb767 MD |
3302 | case atype_variant_nestable: |
3303 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 3304 | break; |
f513b2bf | 3305 | |
8070f5c0 MD |
3306 | default: |
3307 | WARN_ON_ONCE(1); | |
3308 | return -EINVAL; | |
3309 | } | |
3310 | return ret; | |
3311 | } | |
3312 | ||
3313 | static | |
a90917c3 | 3314 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
3315 | struct lttng_ctx *ctx) |
3316 | { | |
3317 | int ret = 0; | |
3318 | int i; | |
3319 | ||
3320 | if (!ctx) | |
3321 | return 0; | |
3322 | for (i = 0; i < ctx->nr_fields; i++) { | |
3323 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
3324 | ||
f513b2bf | 3325 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
3326 | if (ret) |
3327 | return ret; | |
3328 | } | |
3329 | return ret; | |
3330 | } | |
3331 | ||
3332 | static | |
a90917c3 MD |
3333 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
3334 | struct lttng_event *event) | |
8070f5c0 MD |
3335 | { |
3336 | const struct lttng_event_desc *desc = event->desc; | |
3337 | int ret = 0; | |
3338 | int i; | |
3339 | ||
3340 | for (i = 0; i < desc->nr_fields; i++) { | |
3341 | const struct lttng_event_field *field = &desc->fields[i]; | |
3342 | ||
f513b2bf | 3343 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3344 | if (ret) |
3345 | return ret; | |
c099397a MD |
3346 | } |
3347 | return ret; | |
3348 | } | |
3349 | ||
d83004aa JD |
3350 | /* |
3351 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3352 | * The entire event metadata is printed as a single atomic metadata |
3353 | * transaction. | |
d83004aa | 3354 | */ |
c099397a | 3355 | static |
a90917c3 MD |
3356 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3357 | struct lttng_channel *chan, | |
3358 | struct lttng_event *event) | |
c099397a MD |
3359 | { |
3360 | int ret = 0; | |
3361 | ||
585e5dcc | 3362 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3363 | return 0; |
d83004aa | 3364 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3365 | return 0; |
3366 | ||
8b97fd42 MD |
3367 | lttng_metadata_begin(session); |
3368 | ||
c099397a MD |
3369 | ret = lttng_metadata_printf(session, |
3370 | "event {\n" | |
ae734547 | 3371 | " name = \"%s\";\n" |
c099397a | 3372 | " id = %u;\n" |
b9074a1b | 3373 | " stream_id = %u;\n", |
c099397a MD |
3374 | event->desc->name, |
3375 | event->id, | |
3376 | event->chan->id); | |
3377 | if (ret) | |
3378 | goto end; | |
3379 | ||
b9074a1b MD |
3380 | if (event->ctx) { |
3381 | ret = lttng_metadata_printf(session, | |
3382 | " context := struct {\n"); | |
3383 | if (ret) | |
3384 | goto end; | |
3385 | } | |
a90917c3 | 3386 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
3387 | if (ret) |
3388 | goto end; | |
b9074a1b MD |
3389 | if (event->ctx) { |
3390 | ret = lttng_metadata_printf(session, | |
3391 | " };\n"); | |
3392 | if (ret) | |
3393 | goto end; | |
3394 | } | |
8070f5c0 MD |
3395 | |
3396 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
3397 | " fields := struct {\n" |
3398 | ); | |
3399 | if (ret) | |
3400 | goto end; | |
3401 | ||
a90917c3 | 3402 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
3403 | if (ret) |
3404 | goto end; | |
3405 | ||
3406 | /* | |
3407 | * LTTng space reservation can only reserve multiples of the | |
3408 | * byte size. | |
3409 | */ | |
3410 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3411 | " };\n" |
3412 | "};\n\n"); | |
c099397a MD |
3413 | if (ret) |
3414 | goto end; | |
3415 | ||
c099397a MD |
3416 | event->metadata_dumped = 1; |
3417 | end: | |
8b97fd42 | 3418 | lttng_metadata_end(session); |
c099397a MD |
3419 | return ret; |
3420 | ||
3421 | } | |
3422 | ||
d83004aa JD |
3423 | /* |
3424 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3425 | * The entire channel metadata is printed as a single atomic metadata |
3426 | * transaction. | |
d83004aa | 3427 | */ |
c099397a | 3428 | static |
a90917c3 MD |
3429 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3430 | struct lttng_channel *chan) | |
c099397a MD |
3431 | { |
3432 | int ret = 0; | |
3433 | ||
585e5dcc | 3434 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3435 | return 0; |
d83004aa JD |
3436 | |
3437 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3438 | return 0; |
3439 | ||
8b97fd42 MD |
3440 | lttng_metadata_begin(session); |
3441 | ||
c099397a MD |
3442 | WARN_ON_ONCE(!chan->header_type); |
3443 | ret = lttng_metadata_printf(session, | |
3444 | "stream {\n" | |
3445 | " id = %u;\n" | |
9115fbdc | 3446 | " event.header := %s;\n" |
b9074a1b | 3447 | " packet.context := struct packet_context;\n", |
c099397a MD |
3448 | chan->id, |
3449 | chan->header_type == 1 ? "struct event_header_compact" : | |
3450 | "struct event_header_large"); | |
3451 | if (ret) | |
3452 | goto end; | |
3453 | ||
b9074a1b MD |
3454 | if (chan->ctx) { |
3455 | ret = lttng_metadata_printf(session, | |
3456 | " event.context := struct {\n"); | |
3457 | if (ret) | |
3458 | goto end; | |
3459 | } | |
a90917c3 | 3460 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3461 | if (ret) |
3462 | goto end; | |
b9074a1b MD |
3463 | if (chan->ctx) { |
3464 | ret = lttng_metadata_printf(session, | |
3465 | " };\n"); | |
3466 | if (ret) | |
3467 | goto end; | |
3468 | } | |
8070f5c0 MD |
3469 | |
3470 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3471 | "};\n\n"); |
8070f5c0 | 3472 | |
c099397a MD |
3473 | chan->metadata_dumped = 1; |
3474 | end: | |
8b97fd42 | 3475 | lttng_metadata_end(session); |
c099397a MD |
3476 | return ret; |
3477 | } | |
3478 | ||
d83004aa JD |
3479 | /* |
3480 | * Must be called with sessions_mutex held. | |
3481 | */ | |
9115fbdc | 3482 | static |
a90917c3 | 3483 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3484 | { |
3485 | return lttng_metadata_printf(session, | |
3486 | "struct packet_context {\n" | |
a3ccff4f MD |
3487 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3488 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3489 | " uint64_t content_size;\n" |
3490 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3491 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3492 | " unsigned long events_discarded;\n" |
9115fbdc | 3493 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3494 | "};\n\n" |
9115fbdc MD |
3495 | ); |
3496 | } | |
3497 | ||
3498 | /* | |
3499 | * Compact header: | |
3500 | * id: range: 0 - 30. | |
3501 | * id 31 is reserved to indicate an extended header. | |
3502 | * | |
3503 | * Large header: | |
3504 | * id: range: 0 - 65534. | |
3505 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3506 | * |
3507 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3508 | */ |
3509 | static | |
a90917c3 | 3510 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3511 | { |
3512 | return lttng_metadata_printf(session, | |
3513 | "struct event_header_compact {\n" | |
3514 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3515 | " variant <id> {\n" | |
3516 | " struct {\n" | |
a3ccff4f | 3517 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3518 | " } compact;\n" |
3519 | " struct {\n" | |
3520 | " uint32_t id;\n" | |
a3ccff4f | 3521 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3522 | " } extended;\n" |
3523 | " } v;\n" | |
3524 | "} align(%u);\n" | |
3525 | "\n" | |
3526 | "struct event_header_large {\n" | |
3527 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3528 | " variant <id> {\n" | |
3529 | " struct {\n" | |
a3ccff4f | 3530 | " uint32_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\n", | |
a90917c3 MD |
3538 | lttng_alignof(uint32_t) * CHAR_BIT, |
3539 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3540 | ); |
3541 | } | |
3542 | ||
a3ccff4f MD |
3543 | /* |
3544 | * Approximation of NTP time of day to clock monotonic correlation, | |
3545 | * taken at start of trace. | |
3546 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3547 | * in future versions. | |
5283350b MD |
3548 | * This function may return a negative offset. It may happen if the |
3549 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3550 | * |
3551 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3552 | * y2038 compliant. | |
a3ccff4f MD |
3553 | */ |
3554 | static | |
8967b2a3 | 3555 | int64_t measure_clock_offset(void) |
a3ccff4f | 3556 | { |
dcb93448 | 3557 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3558 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3559 | int64_t offset; |
a3ccff4f | 3560 | unsigned long flags; |
3636085f MJ |
3561 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3562 | struct timespec64 rts = { 0, 0 }; | |
3563 | #else | |
3564 | struct timespec rts = { 0, 0 }; | |
3565 | #endif | |
a3ccff4f MD |
3566 | |
3567 | /* Disable interrupts to increase correlation precision. */ | |
3568 | local_irq_save(flags); | |
3569 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3570 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3571 | ktime_get_real_ts64(&rts); | |
3572 | #else | |
216b6baa | 3573 | getnstimeofday(&rts); |
3636085f | 3574 | #endif |
a3ccff4f MD |
3575 | monotonic[1] = trace_clock_read64(); |
3576 | local_irq_restore(flags); | |
3577 | ||
dcb93448 | 3578 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3579 | realtime = (uint64_t) rts.tv_sec * tcf; |
3580 | if (tcf == NSEC_PER_SEC) { | |
3581 | realtime += rts.tv_nsec; | |
3582 | } else { | |
3583 | uint64_t n = rts.tv_nsec * tcf; | |
3584 | ||
3585 | do_div(n, NSEC_PER_SEC); | |
3586 | realtime += n; | |
3587 | } | |
dcb93448 | 3588 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3589 | return offset; |
3590 | } | |
3591 | ||
3eb95be4 JR |
3592 | static |
3593 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3594 | { | |
0f3eaad4 | 3595 | int ret = 0; |
3eb95be4 JR |
3596 | size_t i; |
3597 | char cur; | |
3598 | ||
3599 | i = 0; | |
3600 | cur = string[i]; | |
3601 | while (cur != '\0') { | |
3602 | switch (cur) { | |
3603 | case '\n': | |
3604 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3605 | break; | |
3606 | case '\\': | |
3607 | case '"': | |
3608 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3609 | if (ret) | |
3610 | goto error; | |
3611 | /* We still print the current char */ | |
3612 | /* Fallthrough */ | |
3613 | default: | |
3614 | ret = lttng_metadata_printf(session, "%c", cur); | |
3615 | break; | |
3616 | } | |
3617 | ||
3618 | if (ret) | |
3619 | goto error; | |
3620 | ||
3621 | cur = string[++i]; | |
3622 | } | |
3623 | error: | |
3624 | return ret; | |
3625 | } | |
3626 | ||
3627 | static | |
1c88f269 JR |
3628 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3629 | const char *field_value) | |
3eb95be4 JR |
3630 | { |
3631 | int ret; | |
3632 | ||
1c88f269 | 3633 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3634 | if (ret) |
3635 | goto error; | |
3636 | ||
1c88f269 | 3637 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3638 | if (ret) |
3639 | goto error; | |
3640 | ||
3641 | ret = lttng_metadata_printf(session, "\";\n"); | |
3642 | ||
3643 | error: | |
3644 | return ret; | |
3645 | } | |
3646 | ||
c099397a MD |
3647 | /* |
3648 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3649 | * Must be called with sessions_mutex held. |
c099397a MD |
3650 | */ |
3651 | static | |
a90917c3 | 3652 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3653 | { |
30bdb6e4 | 3654 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3655 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3656 | const char *product_uuid; |
a90917c3 MD |
3657 | struct lttng_channel *chan; |
3658 | struct lttng_event *event; | |
c099397a MD |
3659 | int ret = 0; |
3660 | ||
585e5dcc | 3661 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3662 | return 0; |
8b97fd42 MD |
3663 | |
3664 | lttng_metadata_begin(session); | |
3665 | ||
c099397a MD |
3666 | if (session->metadata_dumped) |
3667 | goto skip_session; | |
c099397a | 3668 | |
d793d5e1 | 3669 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3670 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3671 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3672 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3673 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3674 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3675 | |
3676 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3677 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3678 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3679 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3680 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3681 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3682 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3683 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3684 | "\n" |
3685 | "trace {\n" | |
3686 | " major = %u;\n" | |
3687 | " minor = %u;\n" | |
30bdb6e4 | 3688 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3689 | " byte_order = %s;\n" |
3690 | " packet.header := struct {\n" | |
3691 | " uint32_t magic;\n" | |
1ec3f75a | 3692 | " uint8_t uuid[16];\n" |
d793d5e1 | 3693 | " uint32_t stream_id;\n" |
5594698f | 3694 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3695 | " };\n" |
d793d5e1 | 3696 | "};\n\n", |
a90917c3 MD |
3697 | lttng_alignof(uint8_t) * CHAR_BIT, |
3698 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3699 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3700 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3701 | sizeof(unsigned long) * CHAR_BIT, |
3702 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3703 | CTF_SPEC_MAJOR, |
3704 | CTF_SPEC_MINOR, | |
d793d5e1 | 3705 | uuid_s, |
5214fa50 | 3706 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3707 | "be" |
3708 | #else | |
3709 | "le" | |
3710 | #endif | |
3711 | ); | |
3712 | if (ret) | |
3713 | goto end; | |
3714 | ||
99dc9597 MD |
3715 | ret = lttng_metadata_printf(session, |
3716 | "env {\n" | |
a6058143 | 3717 | " hostname = \"%s\";\n" |
c6c9e10f | 3718 | " domain = \"kernel\";\n" |
99dc9597 | 3719 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3720 | " kernel_release = \"%s\";\n" |
3721 | " kernel_version = \"%s\";\n" | |
3722 | " tracer_name = \"lttng-modules\";\n" | |
3723 | " tracer_major = %d;\n" | |
3724 | " tracer_minor = %d;\n" | |
3725 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3726 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3727 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3728 | utsname()->sysname, |
3729 | utsname()->release, | |
c6c9e10f MD |
3730 | utsname()->version, |
3731 | LTTNG_MODULES_MAJOR_VERSION, | |
3732 | LTTNG_MODULES_MINOR_VERSION, | |
3733 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3734 | ); |
3735 | if (ret) | |
3736 | goto end; | |
3737 | ||
1c88f269 JR |
3738 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3739 | if (ret) | |
3740 | goto end; | |
3741 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3742 | session->creation_time); | |
3eb95be4 JR |
3743 | if (ret) |
3744 | goto end; | |
3745 | ||
c88f762e GB |
3746 | /* Add the product UUID to the 'env' section */ |
3747 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3748 | if (product_uuid) { | |
3749 | ret = lttng_metadata_printf(session, | |
3750 | " product_uuid = \"%s\";\n", | |
3751 | product_uuid | |
3752 | ); | |
3753 | if (ret) | |
3754 | goto end; | |
3755 | } | |
3756 | ||
3757 | /* Close the 'env' section */ | |
3eb95be4 JR |
3758 | ret = lttng_metadata_printf(session, "};\n\n"); |
3759 | if (ret) | |
3760 | goto end; | |
3761 | ||
a3ccff4f MD |
3762 | ret = lttng_metadata_printf(session, |
3763 | "clock {\n" | |
2754583e MD |
3764 | " name = \"%s\";\n", |
3765 | trace_clock_name() | |
a82c63f1 MD |
3766 | ); |
3767 | if (ret) | |
3768 | goto end; | |
3769 | ||
3770 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3771 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3772 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3773 | clock_uuid_s |
3774 | ); | |
3775 | if (ret) | |
3776 | goto end; | |
3777 | } | |
3778 | ||
3779 | ret = lttng_metadata_printf(session, | |
2754583e | 3780 | " description = \"%s\";\n" |
a3ccff4f MD |
3781 | " freq = %llu; /* Frequency, in Hz */\n" |
3782 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3783 | " offset = %lld;\n" |
a3ccff4f | 3784 | "};\n\n", |
2754583e | 3785 | trace_clock_description(), |
a3ccff4f | 3786 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3787 | (long long) measure_clock_offset() |
a3ccff4f MD |
3788 | ); |
3789 | if (ret) | |
3790 | goto end; | |
3791 | ||
3792 | ret = lttng_metadata_printf(session, | |
3793 | "typealias integer {\n" | |
3794 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3795 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3796 | "} := uint27_clock_monotonic_t;\n" |
3797 | "\n" | |
3798 | "typealias integer {\n" | |
3799 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3800 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3801 | "} := uint32_clock_monotonic_t;\n" |
3802 | "\n" | |
3803 | "typealias integer {\n" | |
3804 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3805 | " map = clock.%s.value;\n" |
a3ccff4f | 3806 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3807 | trace_clock_name(), |
a3ccff4f | 3808 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3809 | trace_clock_name(), |
3810 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3811 | trace_clock_name() | |
a3ccff4f MD |
3812 | ); |
3813 | if (ret) | |
3814 | goto end; | |
3815 | ||
a90917c3 | 3816 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3817 | if (ret) |
3818 | goto end; | |
3819 | ||
a90917c3 | 3820 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3821 | if (ret) |
3822 | goto end; | |
3823 | ||
c099397a MD |
3824 | skip_session: |
3825 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 3826 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
3827 | if (ret) |
3828 | goto end; | |
3829 | } | |
3830 | ||
3831 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 3832 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
3833 | if (ret) |
3834 | goto end; | |
3835 | } | |
3836 | session->metadata_dumped = 1; | |
3837 | end: | |
8b97fd42 | 3838 | lttng_metadata_end(session); |
c099397a MD |
3839 | return ret; |
3840 | } | |
3841 | ||
c0e31d2e | 3842 | /** |
a90917c3 | 3843 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3844 | * @transport: transport structure |
3845 | * | |
3846 | * Registers a transport which can be used as output to extract the data out of | |
3847 | * LTTng. The module calling this registration function must ensure that no | |
3848 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3849 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3850 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3851 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3852 | * after its registration must it synchronize the TLBs. |
3853 | */ | |
a90917c3 | 3854 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3855 | { |
3856 | /* | |
3857 | * Make sure no page fault can be triggered by the module about to be | |
3858 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3859 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3860 | */ |
263b6c88 | 3861 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3862 | |
3863 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3864 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3865 | mutex_unlock(&sessions_mutex); |
3866 | } | |
a90917c3 | 3867 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3868 | |
3869 | /** | |
a90917c3 | 3870 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
3871 | * @transport: transport structure |
3872 | */ | |
a90917c3 | 3873 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
3874 | { |
3875 | mutex_lock(&sessions_mutex); | |
3876 | list_del(&transport->node); | |
3877 | mutex_unlock(&sessions_mutex); | |
3878 | } | |
a90917c3 | 3879 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 3880 | |
894ce5dc | 3881 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
3882 | |
3883 | enum cpuhp_state lttng_hp_prepare; | |
3884 | enum cpuhp_state lttng_hp_online; | |
3885 | ||
3886 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
3887 | { | |
3888 | struct lttng_cpuhp_node *lttng_node; | |
3889 | ||
3890 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3891 | switch (lttng_node->component) { | |
3892 | case LTTNG_RING_BUFFER_FRONTEND: | |
3893 | return 0; | |
3894 | case LTTNG_RING_BUFFER_BACKEND: | |
3895 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
3896 | case LTTNG_RING_BUFFER_ITER: | |
3897 | return 0; | |
3898 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3899 | return 0; | |
3900 | default: | |
3901 | return -EINVAL; | |
3902 | } | |
3903 | } | |
3904 | ||
3905 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
3906 | { | |
3907 | struct lttng_cpuhp_node *lttng_node; | |
3908 | ||
3909 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3910 | switch (lttng_node->component) { | |
3911 | case LTTNG_RING_BUFFER_FRONTEND: | |
3912 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
3913 | case LTTNG_RING_BUFFER_BACKEND: | |
3914 | return 0; | |
3915 | case LTTNG_RING_BUFFER_ITER: | |
3916 | return 0; | |
3917 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3918 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
3919 | default: | |
3920 | return -EINVAL; | |
3921 | } | |
3922 | } | |
3923 | ||
3924 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
3925 | { | |
3926 | struct lttng_cpuhp_node *lttng_node; | |
3927 | ||
3928 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3929 | switch (lttng_node->component) { | |
3930 | case LTTNG_RING_BUFFER_FRONTEND: | |
3931 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
3932 | case LTTNG_RING_BUFFER_BACKEND: | |
3933 | return 0; | |
3934 | case LTTNG_RING_BUFFER_ITER: | |
3935 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
3936 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3937 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
3938 | default: | |
3939 | return -EINVAL; | |
3940 | } | |
3941 | } | |
3942 | ||
3943 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
3944 | { | |
3945 | struct lttng_cpuhp_node *lttng_node; | |
3946 | ||
3947 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3948 | switch (lttng_node->component) { | |
3949 | case LTTNG_RING_BUFFER_FRONTEND: | |
3950 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
3951 | case LTTNG_RING_BUFFER_BACKEND: | |
3952 | return 0; | |
3953 | case LTTNG_RING_BUFFER_ITER: | |
3954 | return 0; | |
3955 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3956 | return 0; | |
3957 | default: | |
3958 | return -EINVAL; | |
3959 | } | |
3960 | } | |
3961 | ||
3962 | static int __init lttng_init_cpu_hotplug(void) | |
3963 | { | |
3964 | int ret; | |
3965 | ||
3966 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
3967 | lttng_hotplug_prepare, | |
3968 | lttng_hotplug_dead); | |
3969 | if (ret < 0) { | |
3970 | return ret; | |
3971 | } | |
3972 | lttng_hp_prepare = ret; | |
3973 | lttng_rb_set_hp_prepare(ret); | |
3974 | ||
3975 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
3976 | lttng_hotplug_online, | |
3977 | lttng_hotplug_offline); | |
3978 | if (ret < 0) { | |
3979 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3980 | lttng_hp_prepare = 0; | |
3981 | return ret; | |
3982 | } | |
3983 | lttng_hp_online = ret; | |
3984 | lttng_rb_set_hp_online(ret); | |
3985 | ||
3986 | return 0; | |
3987 | } | |
3988 | ||
3989 | static void __exit lttng_exit_cpu_hotplug(void) | |
3990 | { | |
3991 | lttng_rb_set_hp_online(0); | |
3992 | cpuhp_remove_multi_state(lttng_hp_online); | |
3993 | lttng_rb_set_hp_prepare(0); | |
3994 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3995 | } | |
3996 | ||
1ee63d8d | 3997 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3998 | static int lttng_init_cpu_hotplug(void) |
3999 | { | |
4000 | return 0; | |
4001 | } | |
4002 | static void lttng_exit_cpu_hotplug(void) | |
4003 | { | |
4004 | } | |
1ee63d8d | 4005 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4006 | |
4007 | ||
a90917c3 | 4008 | static int __init lttng_events_init(void) |
4e3c1b9b | 4009 | { |
1c25284c MD |
4010 | int ret; |
4011 | ||
453b2495 JD |
4012 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4013 | if (ret) | |
4014 | return ret; | |
389d7070 | 4015 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4016 | if (ret) |
4017 | return ret; | |
4018 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4019 | if (ret) |
4020 | return ret; | |
4021 | ret = lttng_probes_init(); | |
389d7070 MD |
4022 | if (ret) |
4023 | return ret; | |
07dfc1d0 | 4024 | ret = lttng_context_init(); |
20591cf7 MD |
4025 | if (ret) |
4026 | return ret; | |
07dfc1d0 MD |
4027 | ret = lttng_tracepoint_init(); |
4028 | if (ret) | |
4029 | goto error_tp; | |
a90917c3 | 4030 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
4031 | if (!event_cache) { |
4032 | ret = -ENOMEM; | |
dffef45d FD |
4033 | goto error_kmem_event; |
4034 | } | |
4035 | event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0); | |
4036 | if (!event_notifier_cache) { | |
4037 | ret = -ENOMEM; | |
4038 | goto error_kmem_event_notifier; | |
20591cf7 | 4039 | } |
80996790 | 4040 | ret = lttng_abi_init(); |
02119ee5 MD |
4041 | if (ret) |
4042 | goto error_abi; | |
0c956676 MD |
4043 | ret = lttng_logger_init(); |
4044 | if (ret) | |
4045 | goto error_logger; | |
1e367326 MD |
4046 | ret = lttng_init_cpu_hotplug(); |
4047 | if (ret) | |
4048 | goto error_hotplug; | |
101215b7 | 4049 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4050 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4051 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4052 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4053 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4054 | LTTNG_VERSION_NAME, |
4055 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4056 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4057 | #else | |
4058 | "", | |
4059 | #endif | |
4060 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4061 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4062 | #else | |
4063 | ""); | |
4064 | #endif | |
4e3c1b9b | 4065 | return 0; |
0c956676 | 4066 | |
1e367326 MD |
4067 | error_hotplug: |
4068 | lttng_logger_exit(); | |
0c956676 MD |
4069 | error_logger: |
4070 | lttng_abi_exit(); | |
02119ee5 | 4071 | error_abi: |
dffef45d FD |
4072 | kmem_cache_destroy(event_notifier_cache); |
4073 | error_kmem_event_notifier: | |
1c25284c | 4074 | kmem_cache_destroy(event_cache); |
dffef45d | 4075 | error_kmem_event: |
20591cf7 | 4076 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4077 | error_tp: |
4078 | lttng_context_exit(); | |
101215b7 | 4079 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4080 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4081 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4082 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4083 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4084 | LTTNG_VERSION_NAME, |
4085 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4086 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4087 | #else | |
4088 | "", | |
4089 | #endif | |
4090 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4091 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4092 | #else | |
4093 | ""); | |
4094 | #endif | |
1c25284c | 4095 | return ret; |
4e3c1b9b MD |
4096 | } |
4097 | ||
a90917c3 | 4098 | module_init(lttng_events_init); |
11b5a3c2 | 4099 | |
a90917c3 | 4100 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4101 | { |
a90917c3 | 4102 | struct lttng_session *session, *tmpsession; |
92e94819 | 4103 | |
1e367326 | 4104 | lttng_exit_cpu_hotplug(); |
0c956676 | 4105 | lttng_logger_exit(); |
80996790 | 4106 | lttng_abi_exit(); |
92e94819 | 4107 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 4108 | lttng_session_destroy(session); |
11b5a3c2 | 4109 | kmem_cache_destroy(event_cache); |
dffef45d | 4110 | kmem_cache_destroy(event_notifier_cache); |
20591cf7 | 4111 | lttng_tracepoint_exit(); |
07dfc1d0 | 4112 | lttng_context_exit(); |
101215b7 | 4113 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4114 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4115 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4116 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4117 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4118 | LTTNG_VERSION_NAME, |
4119 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4120 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4121 | #else | |
4122 | "", | |
4123 | #endif | |
4124 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4125 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4126 | #else | |
4127 | ""); | |
4128 | #endif | |
4e3c1b9b | 4129 | } |
92e94819 | 4130 | |
a90917c3 | 4131 | module_exit(lttng_events_exit); |
11b5a3c2 | 4132 | |
7ca11e77 | 4133 | #include <generated/patches.h> |
101215b7 MJ |
4134 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4135 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4136 | #endif | |
4137 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4138 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4139 | #endif | |
92e94819 MD |
4140 | MODULE_LICENSE("GPL and additional rights"); |
4141 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4142 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4143 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4144 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4145 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4146 | LTTNG_MODULES_EXTRAVERSION); |