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> | |
92bc1e23 | 39 | #include <lttng/events-internal.h> |
0b365677 | 40 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 41 | #include <lttng/tracer.h> |
21f58fb7 | 42 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
43 | #include <lttng/abi-old.h> |
44 | #include <lttng/endian.h> | |
45 | #include <lttng/string-utils.h> | |
4a11ef1c | 46 | #include <lttng/utils.h> |
24591303 MD |
47 | #include <ringbuffer/backend.h> |
48 | #include <ringbuffer/frontend.h> | |
3636085f | 49 | #include <wrapper/time.h> |
4e3c1b9b | 50 | |
d83004aa JD |
51 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
52 | ||
4e3c1b9b | 53 | static LIST_HEAD(sessions); |
750b05f2 | 54 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 55 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 56 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
57 | /* |
58 | * Protect the sessions and metadata caches. | |
59 | */ | |
4e3c1b9b | 60 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
61 | static struct kmem_cache *event_recorder_cache; |
62 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 63 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 64 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 65 | |
a40e3229 MD |
66 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
67 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b2bc0bc8 | 68 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); |
dffef45d | 69 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 70 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 71 | |
0648898e | 72 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
ac847066 | 73 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
a67ba386 MD |
74 | static int _lttng_event_unregister(struct lttng_kernel_event_recorder *event); |
75 | static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier); | |
c099397a | 76 | static |
a40e3229 | 77 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 78 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 79 | struct lttng_kernel_event_recorder *event); |
c099397a | 80 | static |
a40e3229 | 81 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
82 | static |
83 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 84 | static |
a40e3229 | 85 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
86 | const struct lttng_kernel_type_common *type, |
87 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
88 | size_t nesting); |
89 | static | |
a40e3229 | 90 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 91 | const struct lttng_kernel_event_field *field, |
f0039724 | 92 | size_t nesting, const char **prev_field_name_p); |
c099397a | 93 | |
c099397a | 94 | void synchronize_trace(void) |
abcca994 | 95 | { |
57acf405 MJ |
96 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
97 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
98 | synchronize_rcu(); |
99 | #else | |
abcca994 | 100 | synchronize_sched(); |
92da05ce MJ |
101 | #endif |
102 | ||
5f4c791e | 103 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
104 | #ifdef CONFIG_PREEMPT_RT_FULL |
105 | synchronize_rcu(); | |
106 | #endif | |
5f4c791e | 107 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
108 | #ifdef CONFIG_PREEMPT_RT |
109 | synchronize_rcu(); | |
110 | #endif | |
5f4c791e | 111 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
112 | } |
113 | ||
3c997079 MD |
114 | void lttng_lock_sessions(void) |
115 | { | |
116 | mutex_lock(&sessions_mutex); | |
117 | } | |
118 | ||
119 | void lttng_unlock_sessions(void) | |
120 | { | |
121 | mutex_unlock(&sessions_mutex); | |
122 | } | |
123 | ||
9fe593d2 FD |
124 | static struct lttng_transport *lttng_transport_find(const char *name) |
125 | { | |
126 | struct lttng_transport *transport; | |
127 | ||
128 | list_for_each_entry(transport, <tng_transport_list, node) { | |
129 | if (!strcmp(transport->name, name)) | |
130 | return transport; | |
131 | } | |
132 | return NULL; | |
133 | } | |
134 | ||
3c997079 MD |
135 | /* |
136 | * Called with sessions lock held. | |
137 | */ | |
138 | int lttng_session_active(void) | |
139 | { | |
a40e3229 | 140 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
141 | |
142 | list_for_each_entry(iter, &sessions, list) { | |
a40e3229 | 143 | if (iter->pub->active) |
3c997079 MD |
144 | return 1; |
145 | } | |
146 | return 0; | |
147 | } | |
148 | ||
a40e3229 | 149 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 150 | { |
a40e3229 MD |
151 | struct lttng_kernel_session *session; |
152 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 153 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 154 | int i; |
4e3c1b9b MD |
155 | |
156 | mutex_lock(&sessions_mutex); | |
a40e3229 | 157 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 158 | if (!session) |
d83004aa | 159 | goto err; |
a40e3229 MD |
160 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
161 | if (!session_priv) | |
162 | goto err_free_session; | |
163 | session->priv = session_priv; | |
164 | session_priv->pub = session; | |
165 | ||
166 | INIT_LIST_HEAD(&session_priv->chan); | |
167 | INIT_LIST_HEAD(&session_priv->events); | |
168 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
169 | |
170 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
171 | GFP_KERNEL); | |
172 | if (!metadata_cache) | |
a40e3229 | 173 | goto err_free_session_private; |
0ca42eb7 | 174 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
175 | if (!metadata_cache->data) |
176 | goto err_free_cache; | |
177 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
178 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 179 | mutex_init(&metadata_cache->lock); |
a40e3229 | 180 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 181 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
a40e3229 | 182 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 183 | sizeof(metadata_cache->uuid)); |
a40e3229 | 184 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 185 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
a40e3229 MD |
186 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
187 | list_add(&session_priv->list, &sessions); | |
188 | ||
a2fa977a MD |
189 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
190 | goto tracker_alloc_error; | |
191 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
192 | goto tracker_alloc_error; | |
193 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
194 | goto tracker_alloc_error; | |
195 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
196 | goto tracker_alloc_error; | |
197 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
198 | goto tracker_alloc_error; | |
199 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
200 | goto tracker_alloc_error; | |
201 | ||
4e3c1b9b | 202 | mutex_unlock(&sessions_mutex); |
a40e3229 | 203 | |
4e3c1b9b | 204 | return session; |
d83004aa | 205 | |
a2fa977a MD |
206 | tracker_alloc_error: |
207 | lttng_id_tracker_fini(&session->pid_tracker); | |
208 | lttng_id_tracker_fini(&session->vpid_tracker); | |
209 | lttng_id_tracker_fini(&session->uid_tracker); | |
210 | lttng_id_tracker_fini(&session->vuid_tracker); | |
211 | lttng_id_tracker_fini(&session->gid_tracker); | |
212 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
213 | err_free_cache: |
214 | kfree(metadata_cache); | |
a40e3229 MD |
215 | err_free_session_private: |
216 | lttng_kvfree(session_priv); | |
d83004aa | 217 | err_free_session: |
48f5e0b5 | 218 | lttng_kvfree(session); |
d83004aa JD |
219 | err: |
220 | mutex_unlock(&sessions_mutex); | |
221 | return NULL; | |
222 | } | |
223 | ||
99f52fcc FD |
224 | static |
225 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
226 | { | |
227 | struct lttng_counter_transport *transport; | |
228 | ||
229 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
230 | if (!strcmp(transport->name, name)) | |
231 | return transport; | |
232 | } | |
233 | return NULL; | |
234 | } | |
235 | ||
236 | struct lttng_counter *lttng_kernel_counter_create( | |
237 | const char *counter_transport_name, | |
238 | size_t number_dimensions, const size_t *dimensions_sizes) | |
239 | { | |
240 | struct lttng_counter *counter = NULL; | |
241 | struct lttng_counter_transport *counter_transport = NULL; | |
242 | ||
243 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
244 | if (!counter_transport) { | |
245 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
246 | counter_transport_name); | |
247 | goto notransport; | |
248 | } | |
249 | if (!try_module_get(counter_transport->owner)) { | |
250 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
251 | goto notransport; | |
252 | } | |
253 | ||
254 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
255 | if (!counter) | |
256 | goto nomem; | |
257 | ||
258 | /* Create event notifier error counter. */ | |
259 | counter->ops = &counter_transport->ops; | |
260 | counter->transport = counter_transport; | |
261 | ||
262 | counter->counter = counter->ops->counter_create( | |
263 | number_dimensions, dimensions_sizes, 0); | |
264 | if (!counter->counter) { | |
265 | goto create_error; | |
266 | } | |
267 | ||
268 | return counter; | |
269 | ||
270 | create_error: | |
271 | lttng_kvfree(counter); | |
272 | nomem: | |
273 | if (counter_transport) | |
274 | module_put(counter_transport->owner); | |
275 | notransport: | |
276 | return NULL; | |
277 | } | |
278 | ||
750b05f2 FD |
279 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
280 | { | |
281 | struct lttng_transport *transport = NULL; | |
282 | struct lttng_event_notifier_group *event_notifier_group; | |
283 | const char *transport_name = "relay-event-notifier"; | |
284 | size_t subbuf_size = 4096; //TODO | |
285 | size_t num_subbuf = 16; //TODO | |
286 | unsigned int switch_timer_interval = 0; | |
287 | unsigned int read_timer_interval = 0; | |
dffef45d | 288 | int i; |
750b05f2 FD |
289 | |
290 | mutex_lock(&sessions_mutex); | |
291 | ||
292 | transport = lttng_transport_find(transport_name); | |
293 | if (!transport) { | |
294 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
295 | transport_name); | |
296 | goto notransport; | |
297 | } | |
298 | if (!try_module_get(transport->owner)) { | |
299 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
300 | transport_name); | |
301 | goto notransport; | |
302 | } | |
303 | ||
304 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
305 | GFP_KERNEL); | |
306 | if (!event_notifier_group) | |
307 | goto nomem; | |
308 | ||
309 | /* | |
310 | * Initialize the ring buffer used to store event notifier | |
311 | * notifications. | |
312 | */ | |
313 | event_notifier_group->ops = &transport->ops; | |
da1fe18f | 314 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
315 | transport_name, event_notifier_group, NULL, |
316 | subbuf_size, num_subbuf, switch_timer_interval, | |
317 | read_timer_interval); | |
318 | if (!event_notifier_group->chan) | |
319 | goto create_error; | |
320 | ||
321 | event_notifier_group->transport = transport; | |
dffef45d FD |
322 | |
323 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
324 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
325 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
326 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
327 | ||
750b05f2 FD |
328 | list_add(&event_notifier_group->node, &event_notifier_groups); |
329 | ||
330 | mutex_unlock(&sessions_mutex); | |
331 | ||
332 | return event_notifier_group; | |
333 | ||
334 | create_error: | |
335 | lttng_kvfree(event_notifier_group); | |
336 | nomem: | |
337 | if (transport) | |
338 | module_put(transport->owner); | |
339 | notransport: | |
340 | mutex_unlock(&sessions_mutex); | |
341 | return NULL; | |
342 | } | |
343 | ||
d83004aa JD |
344 | void metadata_cache_destroy(struct kref *kref) |
345 | { | |
346 | struct lttng_metadata_cache *cache = | |
347 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 348 | vfree(cache->data); |
d83004aa | 349 | kfree(cache); |
4e3c1b9b MD |
350 | } |
351 | ||
a40e3229 | 352 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 353 | { |
ac847066 | 354 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 355 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 356 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 357 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 358 | int ret; |
4e3c1b9b MD |
359 | |
360 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 361 | WRITE_ONCE(session->active, 0); |
ac847066 MD |
362 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
363 | ret = lttng_syscalls_unregister_channel(chan_priv->pub); | |
1ec65de1 MD |
364 | WARN_ON(ret); |
365 | } | |
a40e3229 | 366 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 367 | ret = _lttng_event_unregister(event_recorder_priv->pub); |
dda6a249 MD |
368 | WARN_ON(ret); |
369 | } | |
abcca994 | 370 | synchronize_trace(); /* Wait for in-flight events to complete */ |
ac847066 MD |
371 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
372 | ret = lttng_syscalls_destroy_event(chan_priv->pub); | |
badfe9f5 MD |
373 | WARN_ON(ret); |
374 | } | |
b2bc0bc8 | 375 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
a40e3229 | 376 | &session->priv->enablers_head, node) |
b2bc0bc8 | 377 | lttng_event_enabler_destroy(event_enabler); |
a40e3229 | 378 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node) |
0648898e | 379 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
ac847066 MD |
380 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
381 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
382 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 383 | } |
a40e3229 MD |
384 | mutex_lock(&session->priv->metadata_cache->lock); |
385 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 386 | _lttng_metadata_channel_hangup(metadata_stream); |
a40e3229 | 387 | mutex_unlock(&session->priv->metadata_cache->lock); |
a2fa977a MD |
388 | lttng_id_tracker_fini(&session->pid_tracker); |
389 | lttng_id_tracker_fini(&session->vpid_tracker); | |
390 | lttng_id_tracker_fini(&session->uid_tracker); | |
391 | lttng_id_tracker_fini(&session->vuid_tracker); | |
392 | lttng_id_tracker_fini(&session->gid_tracker); | |
393 | lttng_id_tracker_fini(&session->vgid_tracker); | |
a40e3229 MD |
394 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
395 | list_del(&session->priv->list); | |
4e3c1b9b | 396 | mutex_unlock(&sessions_mutex); |
a40e3229 | 397 | lttng_kvfree(session->priv); |
48f5e0b5 | 398 | lttng_kvfree(session); |
4e3c1b9b MD |
399 | } |
400 | ||
dffef45d FD |
401 | void lttng_event_notifier_group_destroy( |
402 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 403 | { |
dffef45d | 404 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
a67ba386 | 405 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
406 | int ret; |
407 | ||
750b05f2 FD |
408 | if (!event_notifier_group) |
409 | return; | |
410 | ||
411 | mutex_lock(&sessions_mutex); | |
dffef45d | 412 | |
3b82c4e1 | 413 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
414 | WARN_ON(ret); |
415 | ||
a67ba386 MD |
416 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
417 | &event_notifier_group->event_notifiers_head, node) { | |
418 | ret = _lttng_event_notifier_unregister(event_notifier_priv->pub); | |
dffef45d FD |
419 | WARN_ON(ret); |
420 | } | |
421 | ||
b01155ba FD |
422 | /* Wait for in-flight event notifier to complete */ |
423 | synchronize_trace(); | |
424 | ||
21f58fb7 FD |
425 | irq_work_sync(&event_notifier_group->wakeup_pending); |
426 | ||
8a8ac9a8 FD |
427 | kfree(event_notifier_group->sc_filter); |
428 | ||
dffef45d FD |
429 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
430 | &event_notifier_group->enablers_head, node) | |
431 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
432 | ||
a67ba386 MD |
433 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
434 | &event_notifier_group->event_notifiers_head, node) | |
0648898e | 435 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 436 | |
99f52fcc FD |
437 | if (event_notifier_group->error_counter) { |
438 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 439 | |
99f52fcc FD |
440 | error_counter->ops->counter_destroy(error_counter->counter); |
441 | module_put(error_counter->transport->owner); | |
442 | lttng_kvfree(error_counter); | |
443 | event_notifier_group->error_counter = NULL; | |
444 | } | |
445 | ||
da1fe18f | 446 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
447 | module_put(event_notifier_group->transport->owner); |
448 | list_del(&event_notifier_group->node); | |
dffef45d | 449 | |
750b05f2 FD |
450 | mutex_unlock(&sessions_mutex); |
451 | lttng_kvfree(event_notifier_group); | |
452 | } | |
453 | ||
a40e3229 | 454 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
455 | { |
456 | int ret; | |
457 | ||
458 | mutex_lock(&sessions_mutex); | |
459 | ret = lttng_statedump_start(session); | |
460 | mutex_unlock(&sessions_mutex); | |
461 | return ret; | |
462 | } | |
463 | ||
a40e3229 | 464 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
465 | { |
466 | int ret = 0; | |
ac847066 | 467 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
468 | |
469 | mutex_lock(&sessions_mutex); | |
470 | if (session->active) { | |
471 | ret = -EBUSY; | |
472 | goto end; | |
473 | } | |
c099397a | 474 | |
3c997079 | 475 | /* Set transient enabler state to "enabled" */ |
a40e3229 | 476 | session->priv->tstate = 1; |
3c997079 | 477 | |
4ef81e4a | 478 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 479 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 480 | |
c099397a MD |
481 | /* |
482 | * Snapshot the number of events per channel to know the type of header | |
483 | * we need to use. | |
484 | */ | |
ac847066 MD |
485 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
486 | if (chan_priv->header_type) | |
487 | continue; /* don't change it if session stop/restart */ | |
488 | if (chan_priv->free_event_id < 31) | |
489 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 490 | else |
ac847066 | 491 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
492 | } |
493 | ||
64af2437 | 494 | /* Clear each stream's quiescent state. */ |
ac847066 MD |
495 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
496 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
497 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 498 | } |
64af2437 | 499 | |
a8f2d0c7 | 500 | WRITE_ONCE(session->active, 1); |
a40e3229 | 501 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 502 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 503 | if (ret) { |
a8f2d0c7 | 504 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
505 | goto end; |
506 | } | |
507 | ret = lttng_statedump_start(session); | |
360f38ea | 508 | if (ret) |
a8f2d0c7 | 509 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
510 | end: |
511 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 512 | return ret; |
c0e31d2e MD |
513 | } |
514 | ||
a40e3229 | 515 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
516 | { |
517 | int ret = 0; | |
ac847066 | 518 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
519 | |
520 | mutex_lock(&sessions_mutex); | |
521 | if (!session->active) { | |
522 | ret = -EBUSY; | |
523 | goto end; | |
524 | } | |
a8f2d0c7 | 525 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
526 | |
527 | /* Set transient enabler state to "disabled" */ | |
a40e3229 | 528 | session->priv->tstate = 0; |
b2bc0bc8 | 529 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
530 | |
531 | /* Set each stream's quiescent state. */ | |
ac847066 MD |
532 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
533 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
534 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 535 | } |
c0e31d2e MD |
536 | end: |
537 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 538 | return ret; |
c0e31d2e MD |
539 | } |
540 | ||
a40e3229 | 541 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
542 | { |
543 | int ret = 0; | |
ac847066 | 544 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 545 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
a40e3229 | 546 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
547 | struct lttng_metadata_stream *stream; |
548 | ||
549 | mutex_lock(&sessions_mutex); | |
550 | if (!session->active) { | |
551 | ret = -EBUSY; | |
552 | goto end; | |
553 | } | |
554 | ||
555 | mutex_lock(&cache->lock); | |
556 | memset(cache->data, 0, cache->cache_alloc); | |
557 | cache->metadata_written = 0; | |
558 | cache->version++; | |
a40e3229 | 559 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
560 | stream->metadata_out = 0; |
561 | stream->metadata_in = 0; | |
562 | } | |
563 | mutex_unlock(&cache->lock); | |
564 | ||
a40e3229 | 565 | session->priv->metadata_dumped = 0; |
ac847066 MD |
566 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
567 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
568 | } |
569 | ||
a40e3229 | 570 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 571 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
572 | } |
573 | ||
574 | ret = _lttng_session_metadata_statedump(session); | |
575 | ||
576 | end: | |
577 | mutex_unlock(&sessions_mutex); | |
578 | return ret; | |
579 | } | |
580 | ||
ac847066 | 581 | int lttng_channel_enable(struct lttng_kernel_channel_buffer *channel) |
e64957da | 582 | { |
3c997079 | 583 | int ret = 0; |
e64957da | 584 | |
3c997079 | 585 | mutex_lock(&sessions_mutex); |
ac847066 | 586 | if (channel->priv->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
587 | ret = -EPERM; |
588 | goto end; | |
589 | } | |
ac847066 | 590 | if (channel->parent.enabled) { |
3c997079 MD |
591 | ret = -EEXIST; |
592 | goto end; | |
593 | } | |
594 | /* Set transient enabler state to "enabled" */ | |
ac847066 MD |
595 | channel->priv->parent.tstate = 1; |
596 | lttng_session_sync_event_enablers(channel->parent.session); | |
3c997079 | 597 | /* Set atomically the state to "enabled" */ |
ac847066 | 598 | WRITE_ONCE(channel->parent.enabled, 1); |
3c997079 MD |
599 | end: |
600 | mutex_unlock(&sessions_mutex); | |
601 | return ret; | |
e64957da MD |
602 | } |
603 | ||
ac847066 | 604 | int lttng_channel_disable(struct lttng_kernel_channel_buffer *channel) |
e64957da | 605 | { |
3c997079 | 606 | int ret = 0; |
e64957da | 607 | |
3c997079 | 608 | mutex_lock(&sessions_mutex); |
ac847066 | 609 | if (channel->priv->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
610 | ret = -EPERM; |
611 | goto end; | |
612 | } | |
ac847066 | 613 | if (!channel->parent.enabled) { |
3c997079 MD |
614 | ret = -EEXIST; |
615 | goto end; | |
616 | } | |
617 | /* Set atomically the state to "disabled" */ | |
ac847066 | 618 | WRITE_ONCE(channel->parent.enabled, 0); |
3c997079 | 619 | /* Set transient enabler state to "enabled" */ |
ac847066 MD |
620 | channel->priv->parent.tstate = 0; |
621 | lttng_session_sync_event_enablers(channel->parent.session); | |
3c997079 MD |
622 | end: |
623 | mutex_unlock(&sessions_mutex); | |
624 | return ret; | |
e64957da MD |
625 | } |
626 | ||
9d993668 | 627 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 628 | { |
3c997079 | 629 | int ret = 0; |
e64957da | 630 | |
3c997079 | 631 | mutex_lock(&sessions_mutex); |
9d993668 MD |
632 | switch (event->type) { |
633 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
634 | { | |
635 | struct lttng_kernel_event_recorder *event_recorder = | |
636 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
637 | ||
ac847066 | 638 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
639 | ret = -EPERM; |
640 | goto end; | |
641 | } | |
a0493bef | 642 | break; |
9d993668 MD |
643 | } |
644 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
645 | switch (event->priv->instrumentation) { | |
646 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
647 | ret = -EINVAL; | |
648 | goto end; | |
649 | default: | |
650 | break; | |
651 | } | |
a0493bef MD |
652 | break; |
653 | default: | |
9d993668 | 654 | break; |
a0493bef | 655 | } |
e64957da | 656 | |
9d993668 | 657 | if (event->enabled) { |
3c997079 MD |
658 | ret = -EEXIST; |
659 | goto end; | |
660 | } | |
a67ba386 | 661 | switch (event->priv->instrumentation) { |
606828e4 MD |
662 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
663 | case LTTNG_KERNEL_ABI_SYSCALL: | |
a0493bef MD |
664 | ret = -EINVAL; |
665 | break; | |
b4a75708 | 666 | |
606828e4 MD |
667 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
668 | case LTTNG_KERNEL_ABI_UPROBE: | |
9d993668 | 669 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 670 | break; |
b4a75708 | 671 | |
606828e4 | 672 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 673 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 674 | break; |
b4a75708 | 675 | |
606828e4 MD |
676 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
677 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
a0493bef MD |
678 | default: |
679 | WARN_ON_ONCE(1); | |
680 | ret = -EINVAL; | |
681 | } | |
3c997079 MD |
682 | end: |
683 | mutex_unlock(&sessions_mutex); | |
684 | return ret; | |
e64957da MD |
685 | } |
686 | ||
9d993668 | 687 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
688 | { |
689 | int ret = 0; | |
690 | ||
691 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
692 | switch (event->type) { |
693 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
694 | { | |
695 | struct lttng_kernel_event_recorder *event_recorder = | |
696 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
697 | ||
ac847066 | 698 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
699 | ret = -EPERM; |
700 | goto end; | |
701 | } | |
b01155ba | 702 | break; |
9d993668 MD |
703 | } |
704 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
705 | switch (event->priv->instrumentation) { | |
706 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
707 | ret = -EINVAL; | |
708 | goto end; | |
709 | default: | |
710 | break; | |
711 | } | |
2b16f0c9 | 712 | break; |
dffef45d | 713 | default: |
9d993668 | 714 | break; |
dffef45d | 715 | } |
dffef45d | 716 | |
a67ba386 | 717 | if (!event->enabled) { |
dffef45d FD |
718 | ret = -EEXIST; |
719 | goto end; | |
720 | } | |
a67ba386 | 721 | switch (event->priv->instrumentation) { |
606828e4 MD |
722 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
723 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
724 | ret = -EINVAL; |
725 | break; | |
b4a75708 | 726 | |
606828e4 MD |
727 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
728 | case LTTNG_KERNEL_ABI_UPROBE: | |
a67ba386 | 729 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 730 | break; |
b4a75708 | 731 | |
9d993668 MD |
732 | case LTTNG_KERNEL_ABI_KRETPROBE: |
733 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
734 | break; | |
735 | ||
606828e4 | 736 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
606828e4 | 737 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ |
dffef45d FD |
738 | default: |
739 | WARN_ON_ONCE(1); | |
740 | ret = -EINVAL; | |
741 | } | |
742 | end: | |
743 | mutex_unlock(&sessions_mutex); | |
744 | return ret; | |
745 | } | |
746 | ||
ac847066 | 747 | struct lttng_kernel_channel_buffer *lttng_channel_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
748 | const char *transport_name, |
749 | void *buf_addr, | |
4e3c1b9b MD |
750 | size_t subbuf_size, size_t num_subbuf, |
751 | unsigned int switch_timer_interval, | |
d83004aa JD |
752 | unsigned int read_timer_interval, |
753 | enum channel_type channel_type) | |
4e3c1b9b | 754 | { |
ac847066 MD |
755 | struct lttng_kernel_channel_buffer *chan; |
756 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 757 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
758 | |
759 | mutex_lock(&sessions_mutex); | |
a40e3229 | 760 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 761 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 762 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 763 | if (!transport) { |
5a15f70c | 764 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 765 | transport_name); |
c0e31d2e | 766 | goto notransport; |
f3d01b96 | 767 | } |
a33c9927 | 768 | if (!try_module_get(transport->owner)) { |
5a15f70c | 769 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
770 | goto notransport; |
771 | } | |
ac847066 | 772 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 773 | if (!chan) |
c0e31d2e | 774 | goto nomem; |
ac847066 MD |
775 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
776 | if (!chan_priv) | |
777 | goto nomem_priv; | |
778 | chan->priv = chan_priv; | |
779 | chan_priv->pub = chan; | |
780 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
781 | chan->parent.session = session; | |
782 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 783 | chan->ops = &transport->ops; |
125b4df4 MD |
784 | /* |
785 | * Note: the channel creation op already writes into the packet | |
786 | * headers. Therefore the "chan" information used as input | |
787 | * should be already accessible. | |
788 | */ | |
ac847066 | 789 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
790 | chan, buf_addr, subbuf_size, num_subbuf, |
791 | switch_timer_interval, read_timer_interval); | |
ac847066 | 792 | if (!chan->priv->rb_chan) |
f3d01b96 | 793 | goto create_error; |
ac847066 MD |
794 | chan->priv->parent.tstate = 1; |
795 | chan->parent.enabled = 1; | |
796 | chan->priv->transport = transport; | |
797 | chan->priv->channel_type = channel_type; | |
798 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
799 | mutex_unlock(&sessions_mutex); |
800 | return chan; | |
801 | ||
f3d01b96 | 802 | create_error: |
ac847066 MD |
803 | kfree(chan_priv); |
804 | nomem_priv: | |
f3d01b96 | 805 | kfree(chan); |
c0e31d2e | 806 | nomem: |
a33c9927 MD |
807 | if (transport) |
808 | module_put(transport->owner); | |
c0e31d2e | 809 | notransport: |
e5382b6d | 810 | active: |
4e3c1b9b MD |
811 | mutex_unlock(&sessions_mutex); |
812 | return NULL; | |
813 | } | |
814 | ||
815 | /* | |
d83004aa JD |
816 | * Only used internally at session destruction for per-cpu channels, and |
817 | * when metadata channel is released. | |
818 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 819 | */ |
aa7c23a9 | 820 | static |
ac847066 | 821 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 822 | { |
ac847066 MD |
823 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
824 | module_put(chan->priv->transport->owner); | |
825 | list_del(&chan->priv->node); | |
826 | lttng_kernel_destroy_context(chan->priv->ctx); | |
827 | kfree(chan->priv); | |
4e3c1b9b MD |
828 | kfree(chan); |
829 | } | |
830 | ||
ac847066 | 831 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 832 | { |
ac847066 | 833 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
834 | |
835 | /* Protect the metadata cache with the sessions_mutex. */ | |
836 | mutex_lock(&sessions_mutex); | |
837 | _lttng_channel_destroy(chan); | |
838 | mutex_unlock(&sessions_mutex); | |
839 | } | |
840 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
841 | ||
842 | static | |
843 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
844 | { | |
845 | stream->finalized = 1; | |
846 | wake_up_interruptible(&stream->read_wait); | |
847 | } | |
848 | ||
a101fa10 | 849 | |
e5382b6d MD |
850 | /* |
851 | * Supports event creation while tracing session is active. | |
3c997079 | 852 | * Needs to be called with sessions mutex held. |
e5382b6d | 853 | */ |
ac847066 | 854 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan, |
606828e4 | 855 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 856 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 857 | enum lttng_kernel_abi_instrumentation itype) |
4e3c1b9b | 858 | { |
ac847066 | 859 | struct lttng_kernel_session *session = chan->parent.session; |
a67ba386 MD |
860 | struct lttng_kernel_event_recorder *event_recorder; |
861 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
862 | const char *event_name; |
863 | struct hlist_head *head; | |
3d084699 | 864 | int ret; |
4e3c1b9b | 865 | |
ac847066 | 866 | if (chan->priv->free_event_id == -1U) { |
4cf0bf51 | 867 | ret = -EMFILE; |
e5382b6d | 868 | goto full; |
abc0446a | 869 | } |
3c997079 MD |
870 | |
871 | switch (itype) { | |
606828e4 | 872 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 873 | event_name = event_desc->event_name; |
3c997079 | 874 | break; |
b4a75708 | 875 | |
606828e4 MD |
876 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
877 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
878 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
879 | case LTTNG_KERNEL_ABI_SYSCALL: | |
3c997079 MD |
880 | event_name = event_param->name; |
881 | break; | |
b4a75708 | 882 | |
606828e4 MD |
883 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
884 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
3c997079 MD |
885 | default: |
886 | WARN_ON_ONCE(1); | |
887 | ret = -EINVAL; | |
888 | goto type_error; | |
889 | } | |
4a11ef1c | 890 | |
a40e3229 | 891 | head = utils_borrow_hash_table_bucket(session->priv->events_ht.table, |
4a11ef1c | 892 | LTTNG_EVENT_HT_SIZE, event_name); |
a67ba386 MD |
893 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
894 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
895 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 896 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 897 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
898 | ret = -EEXIST; |
899 | goto exist; | |
abc0446a MD |
900 | } |
901 | } | |
3c997079 | 902 | |
a67ba386 MD |
903 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
904 | if (!event_recorder) { | |
4cf0bf51 | 905 | ret = -ENOMEM; |
4e3c1b9b | 906 | goto cache_error; |
abc0446a | 907 | } |
a67ba386 MD |
908 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
909 | if (!event_recorder_priv) { | |
910 | ret = -ENOMEM; | |
911 | goto cache_private_error; | |
912 | } | |
913 | event_recorder_priv->pub = event_recorder; | |
914 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
915 | event_recorder->priv = event_recorder_priv; | |
916 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
917 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
918 | ||
8a445457 | 919 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 920 | event_recorder->chan = chan; |
ac847066 | 921 | event_recorder->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
922 | event_recorder->priv->parent.instrumentation = itype; |
923 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
924 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
925 | |
926 | switch (itype) { | |
606828e4 | 927 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 928 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
929 | event_recorder->parent.enabled = 0; |
930 | event_recorder->priv->parent.registered = 0; | |
931 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
932 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 933 | ret = -ENOENT; |
d3dbe23c | 934 | goto register_error; |
abc0446a | 935 | } |
3c997079 MD |
936 | /* Populate lttng_event structure before event registration. */ |
937 | smp_wmb(); | |
baf20995 | 938 | break; |
b4a75708 | 939 | |
606828e4 | 940 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
941 | /* |
942 | * Needs to be explicitly enabled after creation, since | |
943 | * we may want to apply filters. | |
944 | */ | |
a67ba386 MD |
945 | event_recorder->parent.enabled = 0; |
946 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
947 | /* |
948 | * Populate lttng_event structure before event | |
949 | * registration. | |
950 | */ | |
951 | smp_wmb(); | |
8bf17deb | 952 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
953 | event_param->u.kprobe.symbol_name, |
954 | event_param->u.kprobe.offset, | |
955 | event_param->u.kprobe.addr, | |
a67ba386 | 956 | event_recorder); |
abc0446a | 957 | if (ret) { |
4cf0bf51 | 958 | ret = -EINVAL; |
d6d808f3 | 959 | goto register_error; |
abc0446a | 960 | } |
a67ba386 | 961 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 962 | WARN_ON_ONCE(!ret); |
d6d808f3 | 963 | break; |
b4a75708 | 964 | |
606828e4 | 965 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 966 | { |
a67ba386 MD |
967 | struct lttng_kernel_event_recorder *event_recorder_return; |
968 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
969 | |
970 | /* kretprobe defines 2 events */ | |
a0493bef MD |
971 | /* |
972 | * Needs to be explicitly enabled after creation, since | |
973 | * we may want to apply filters. | |
974 | */ | |
a67ba386 MD |
975 | event_recorder->parent.enabled = 0; |
976 | event_recorder->priv->parent.registered = 1; | |
977 | ||
978 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
979 | if (!event_recorder_return) { | |
980 | ret = -ENOMEM; | |
981 | goto register_error; | |
982 | } | |
983 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
984 | if (!event_recorder_return_priv) { | |
985 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 986 | ret = -ENOMEM; |
7371f44c | 987 | goto register_error; |
abc0446a | 988 | } |
a67ba386 MD |
989 | event_recorder_return_priv->pub = event_recorder_return; |
990 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
991 | event_recorder_return->priv = event_recorder_return_priv; | |
992 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
993 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
994 | ||
8a445457 | 995 | event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 996 | event_recorder_return->chan = chan; |
ac847066 | 997 | event_recorder_return->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
998 | event_recorder_return->priv->parent.instrumentation = itype; |
999 | event_recorder_return->parent.enabled = 0; | |
1000 | event_recorder_return->priv->parent.registered = 1; | |
1001 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
1002 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 1003 | /* |
a90917c3 | 1004 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1005 | */ |
1006 | smp_wmb(); | |
3c997079 | 1007 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1008 | event_param->u.kretprobe.symbol_name, |
1009 | event_param->u.kretprobe.offset, | |
1010 | event_param->u.kretprobe.addr, | |
a67ba386 | 1011 | event_recorder, event_recorder_return); |
7371f44c | 1012 | if (ret) { |
a67ba386 MD |
1013 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1014 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1015 | ret = -EINVAL; |
7371f44c MD |
1016 | goto register_error; |
1017 | } | |
1018 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1019 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1020 | WARN_ON_ONCE(!ret); |
a67ba386 | 1021 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1022 | WARN_ON_ONCE(!ret); |
ac847066 | 1023 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, |
a67ba386 | 1024 | event_recorder_return); |
abc0446a | 1025 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1026 | if (ret) { |
a67ba386 MD |
1027 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1028 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
1029 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1030 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1031 | goto statedump_error; |
1032 | } | |
ac847066 | 1033 | list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events); |
7371f44c MD |
1034 | break; |
1035 | } | |
b4a75708 | 1036 | |
606828e4 | 1037 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1038 | /* |
1039 | * Needs to be explicitly enabled after creation, since | |
1040 | * we may want to apply filters. | |
1041 | */ | |
a67ba386 MD |
1042 | event_recorder->parent.enabled = 0; |
1043 | event_recorder->priv->parent.registered = 0; | |
1044 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1045 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1046 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1047 | ret = -EINVAL; |
1048 | goto register_error; | |
606828e4 | 1049 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1050 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1051 | break; |
606828e4 | 1052 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1053 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1054 | break; |
1055 | } | |
1056 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1057 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1058 | ret = -EINVAL; |
1059 | goto register_error; | |
606828e4 | 1060 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1061 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1062 | break; |
606828e4 | 1063 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1064 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1065 | break; |
1066 | } | |
a67ba386 | 1067 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1068 | ret = -EINVAL; |
259b6cb3 | 1069 | goto register_error; |
abc0446a | 1070 | } |
1ec65de1 | 1071 | break; |
b4a75708 | 1072 | |
606828e4 | 1073 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1074 | /* |
1075 | * Needs to be explicitly enabled after creation, since | |
1076 | * we may want to apply filters. | |
1077 | */ | |
a67ba386 MD |
1078 | event_recorder->parent.enabled = 0; |
1079 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1080 | |
a344f64b FD |
1081 | /* |
1082 | * Populate lttng_event structure before event | |
1083 | * registration. | |
1084 | */ | |
1085 | smp_wmb(); | |
149b9a9d | 1086 | |
83b802dc | 1087 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1088 | event_param->u.uprobe.fd, |
a67ba386 | 1089 | event_recorder); |
149b9a9d YB |
1090 | if (ret) |
1091 | goto register_error; | |
a67ba386 | 1092 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1093 | WARN_ON_ONCE(!ret); |
1094 | break; | |
b4a75708 | 1095 | |
606828e4 MD |
1096 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1097 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
baf20995 MD |
1098 | default: |
1099 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1100 | ret = -EINVAL; |
df07930b | 1101 | goto register_error; |
baf20995 | 1102 | } |
ac847066 | 1103 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder); |
abc0446a MD |
1104 | WARN_ON_ONCE(ret > 0); |
1105 | if (ret) { | |
c099397a | 1106 | goto statedump_error; |
abc0446a | 1107 | } |
a67ba386 | 1108 | hlist_add_head(&event_recorder->priv->hlist, head); |
ac847066 | 1109 | list_add(&event_recorder->priv->node, &chan->parent.session->priv->events); |
a67ba386 | 1110 | return event_recorder; |
4e3c1b9b | 1111 | |
c099397a | 1112 | statedump_error: |
259b6cb3 | 1113 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1114 | register_error: |
a67ba386 MD |
1115 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1116 | cache_private_error: | |
1117 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1118 | cache_error: |
1119 | exist: | |
3c997079 | 1120 | type_error: |
e5382b6d | 1121 | full: |
4cf0bf51 | 1122 | return ERR_PTR(ret); |
4e3c1b9b MD |
1123 | } |
1124 | ||
a67ba386 | 1125 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1126 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1127 | uint64_t token, uint64_t error_counter_index, |
1128 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1129 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1130 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1131 | { |
a67ba386 MD |
1132 | struct lttng_kernel_event_notifier *event_notifier; |
1133 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1134 | struct lttng_counter *error_counter; |
dffef45d FD |
1135 | const char *event_name; |
1136 | struct hlist_head *head; | |
1137 | int ret; | |
1138 | ||
1139 | switch (itype) { | |
606828e4 | 1140 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1141 | event_name = event_desc->event_name; |
b01155ba | 1142 | break; |
b4a75708 | 1143 | |
606828e4 MD |
1144 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1145 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
1146 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2b16f0c9 FD |
1147 | event_name = event_notifier_param->event.name; |
1148 | break; | |
b4a75708 | 1149 | |
606828e4 MD |
1150 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1151 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1152 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1153 | default: |
1154 | WARN_ON_ONCE(1); | |
1155 | ret = -EINVAL; | |
1156 | goto type_error; | |
1157 | } | |
1158 | ||
1159 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1160 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
a67ba386 MD |
1161 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1162 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1163 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1164 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1165 | && event_notifier_group == event_notifier_priv->group |
1166 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1167 | ret = -EEXIST; |
1168 | goto exist; | |
1169 | } | |
1170 | } | |
1171 | ||
1172 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1173 | if (!event_notifier) { | |
1174 | ret = -ENOMEM; | |
1175 | goto cache_error; | |
1176 | } | |
a67ba386 MD |
1177 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1178 | if (!event_notifier_priv) { | |
1179 | ret = -ENOMEM; | |
1180 | goto cache_private_error; | |
1181 | } | |
1182 | event_notifier_priv->pub = event_notifier; | |
1183 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1184 | event_notifier->priv = event_notifier_priv; | |
1185 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1186 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1187 | ||
1188 | event_notifier->priv->group = event_notifier_group; | |
1189 | event_notifier->priv->parent.user_token = token; | |
1190 | event_notifier->priv->error_counter_index = error_counter_index; | |
1191 | event_notifier->priv->num_captures = 0; | |
1192 | event_notifier->priv->parent.instrumentation = itype; | |
1193 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1194 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1195 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1196 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
8a445457 | 1197 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; |
dffef45d FD |
1198 | |
1199 | switch (itype) { | |
606828e4 | 1200 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1201 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1202 | event_notifier->parent.enabled = 0; |
1203 | event_notifier->priv->parent.registered = 0; | |
1204 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1205 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1206 | ret = -ENOENT; |
1207 | goto register_error; | |
1208 | } | |
1209 | /* Populate lttng_event_notifier structure before event registration. */ | |
1210 | smp_wmb(); | |
1211 | break; | |
b4a75708 | 1212 | |
606828e4 | 1213 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1214 | /* |
1215 | * Needs to be explicitly enabled after creation, since | |
1216 | * we may want to apply filters. | |
1217 | */ | |
a67ba386 MD |
1218 | event_notifier->parent.enabled = 0; |
1219 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1220 | /* |
1221 | * Populate lttng_event_notifier structure before event | |
1222 | * registration. | |
1223 | */ | |
1224 | smp_wmb(); | |
1225 | ret = lttng_kprobes_register_event_notifier( | |
1226 | event_notifier_param->event.u.kprobe.symbol_name, | |
1227 | event_notifier_param->event.u.kprobe.offset, | |
1228 | event_notifier_param->event.u.kprobe.addr, | |
1229 | event_notifier); | |
1230 | if (ret) { | |
1231 | ret = -EINVAL; | |
1232 | goto register_error; | |
1233 | } | |
a67ba386 | 1234 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1235 | WARN_ON_ONCE(!ret); |
1236 | break; | |
b4a75708 | 1237 | |
606828e4 | 1238 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1239 | /* |
1240 | * Needs to be explicitly enabled after creation, since | |
1241 | * we may want to apply filters. | |
1242 | */ | |
a67ba386 MD |
1243 | event_notifier->parent.enabled = 0; |
1244 | event_notifier->priv->parent.registered = 0; | |
1245 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1246 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1247 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1248 | ret = -EINVAL; |
1249 | goto register_error; | |
606828e4 | 1250 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1251 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1252 | break; |
606828e4 | 1253 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1254 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1255 | break; |
1256 | } | |
1257 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1258 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1259 | ret = -EINVAL; |
1260 | goto register_error; | |
606828e4 | 1261 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1262 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1263 | break; |
606828e4 | 1264 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1265 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1266 | break; |
1267 | } | |
1268 | ||
a67ba386 | 1269 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1270 | ret = -EINVAL; |
1271 | goto register_error; | |
1272 | } | |
1273 | break; | |
b4a75708 | 1274 | |
606828e4 | 1275 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1276 | /* |
1277 | * Needs to be explicitly enabled after creation, since | |
1278 | * we may want to apply filters. | |
1279 | */ | |
a67ba386 MD |
1280 | event_notifier->parent.enabled = 0; |
1281 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1282 | |
1283 | /* | |
1284 | * Populate lttng_event_notifier structure before | |
1285 | * event_notifier registration. | |
1286 | */ | |
1287 | smp_wmb(); | |
1288 | ||
1289 | ret = lttng_uprobes_register_event_notifier( | |
1290 | event_notifier_param->event.name, | |
1291 | event_notifier_param->event.u.uprobe.fd, | |
1292 | event_notifier); | |
1293 | if (ret) | |
1294 | goto register_error; | |
a67ba386 | 1295 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1296 | WARN_ON_ONCE(!ret); |
1297 | break; | |
b4a75708 | 1298 | |
606828e4 MD |
1299 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1300 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1301 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1302 | default: |
1303 | WARN_ON_ONCE(1); | |
1304 | ret = -EINVAL; | |
1305 | goto register_error; | |
1306 | } | |
1307 | ||
a67ba386 MD |
1308 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1309 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1310 | |
1311 | /* | |
1312 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1313 | * bucket is currently in use. We trust it. The session lock |
1314 | * synchronizes against concurrent creation of the error | |
1315 | * counter. | |
99f52fcc | 1316 | */ |
ab04d7b1 MD |
1317 | error_counter = event_notifier_group->error_counter; |
1318 | if (error_counter) { | |
99f52fcc FD |
1319 | size_t dimension_index[1]; |
1320 | ||
1321 | /* | |
1322 | * Check that the index is within the boundary of the counter. | |
1323 | */ | |
a67ba386 | 1324 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1325 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1326 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1327 | ret = -EINVAL; |
1328 | goto register_error; | |
1329 | } | |
1330 | ||
a67ba386 | 1331 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1332 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1333 | if (ret) { |
1334 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1335 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1336 | goto register_error; |
1337 | } | |
1338 | } | |
1339 | ||
dffef45d FD |
1340 | return event_notifier; |
1341 | ||
1342 | register_error: | |
a67ba386 MD |
1343 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1344 | cache_private_error: | |
dffef45d FD |
1345 | kmem_cache_free(event_notifier_cache, event_notifier); |
1346 | cache_error: | |
1347 | exist: | |
1348 | type_error: | |
1349 | return ERR_PTR(ret); | |
1350 | } | |
1351 | ||
99f52fcc FD |
1352 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1353 | const size_t *dim_indexes, int32_t cpu, | |
1354 | int64_t *val, bool *overflow, bool *underflow) | |
1355 | { | |
1356 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1357 | cpu, val, overflow, underflow); | |
1358 | } | |
1359 | ||
1360 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1361 | const size_t *dim_indexes, int64_t *val, | |
1362 | bool *overflow, bool *underflow) | |
1363 | { | |
1364 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1365 | val, overflow, underflow); | |
1366 | } | |
1367 | ||
1368 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1369 | const size_t *dim_indexes) | |
1370 | { | |
1371 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1372 | } | |
1373 | ||
ac847066 | 1374 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan, |
606828e4 | 1375 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 1376 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 1377 | enum lttng_kernel_abi_instrumentation itype) |
3c997079 | 1378 | { |
a67ba386 | 1379 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1380 | |
1381 | mutex_lock(&sessions_mutex); | |
a67ba386 | 1382 | event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype); |
3c997079 MD |
1383 | mutex_unlock(&sessions_mutex); |
1384 | return event; | |
1385 | } | |
1386 | ||
a67ba386 | 1387 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1388 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1389 | uint64_t id, uint64_t error_counter_index, |
1390 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1391 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1392 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1393 | { |
a67ba386 | 1394 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1395 | |
1396 | mutex_lock(&sessions_mutex); | |
1397 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1398 | error_counter_index, event_notifier_group, |
a67ba386 | 1399 | event_notifier_param, itype); |
dffef45d FD |
1400 | mutex_unlock(&sessions_mutex); |
1401 | return event_notifier; | |
1402 | } | |
1403 | ||
3c997079 MD |
1404 | /* Only used for tracepoints for now. */ |
1405 | static | |
a67ba386 | 1406 | void register_event(struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 1407 | { |
437d5aa5 | 1408 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1409 | int ret = -EINVAL; |
3c997079 | 1410 | |
a67ba386 | 1411 | if (event_recorder->priv->parent.registered) |
3c997079 | 1412 | return; |
4ecb5ad5 | 1413 | |
a67ba386 MD |
1414 | desc = event_recorder->priv->parent.desc; |
1415 | switch (event_recorder->priv->parent.instrumentation) { | |
606828e4 | 1416 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1417 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
e69abdfd | 1418 | desc->tp_class->probe_callback, |
a67ba386 | 1419 | event_recorder); |
4ecb5ad5 | 1420 | break; |
b4a75708 | 1421 | |
606828e4 | 1422 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1423 | ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1424 | break; |
b4a75708 | 1425 | |
606828e4 MD |
1426 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1427 | case LTTNG_KERNEL_ABI_UPROBE: /* Fall-through */ | |
1428 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
4ecb5ad5 MD |
1429 | ret = 0; |
1430 | break; | |
b4a75708 | 1431 | |
606828e4 MD |
1432 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1433 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
4ecb5ad5 MD |
1434 | default: |
1435 | WARN_ON_ONCE(1); | |
1436 | } | |
3c997079 | 1437 | if (!ret) |
a67ba386 | 1438 | event_recorder->priv->parent.registered = 1; |
3c997079 MD |
1439 | } |
1440 | ||
4e3c1b9b MD |
1441 | /* |
1442 | * Only used internally at session destruction. | |
1443 | */ | |
a67ba386 | 1444 | int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder) |
4e3c1b9b | 1445 | { |
a67ba386 | 1446 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
437d5aa5 | 1447 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1448 | int ret = -EINVAL; |
1449 | ||
a67ba386 | 1450 | if (!event_priv->registered) |
3c997079 MD |
1451 | return 0; |
1452 | ||
a67ba386 MD |
1453 | desc = event_priv->desc; |
1454 | switch (event_priv->instrumentation) { | |
606828e4 | 1455 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1456 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
e69abdfd | 1457 | event_priv->desc->tp_class->probe_callback, |
a67ba386 | 1458 | event_recorder); |
baf20995 | 1459 | break; |
b4a75708 | 1460 | |
606828e4 | 1461 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 | 1462 | lttng_kprobes_unregister_event(event_recorder); |
d6d808f3 MD |
1463 | ret = 0; |
1464 | break; | |
b4a75708 | 1465 | |
606828e4 | 1466 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 1467 | lttng_kretprobes_unregister(event_recorder); |
7371f44c MD |
1468 | ret = 0; |
1469 | break; | |
b4a75708 | 1470 | |
606828e4 | 1471 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1472 | ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1473 | break; |
b4a75708 | 1474 | |
606828e4 | 1475 | case LTTNG_KERNEL_ABI_NOOP: |
259b6cb3 MD |
1476 | ret = 0; |
1477 | break; | |
b4a75708 | 1478 | |
606828e4 | 1479 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 1480 | lttng_uprobes_unregister_event(event_recorder); |
149b9a9d YB |
1481 | ret = 0; |
1482 | break; | |
b4a75708 | 1483 | |
606828e4 | 1484 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
baf20995 MD |
1485 | default: |
1486 | WARN_ON_ONCE(1); | |
1487 | } | |
3c997079 | 1488 | if (!ret) |
a67ba386 | 1489 | event_priv->registered = 0; |
dda6a249 MD |
1490 | return ret; |
1491 | } | |
1492 | ||
dffef45d FD |
1493 | /* Only used for tracepoints for now. */ |
1494 | static | |
a67ba386 | 1495 | void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1496 | { |
437d5aa5 | 1497 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1498 | int ret = -EINVAL; |
1499 | ||
a67ba386 | 1500 | if (event_notifier->priv->parent.registered) |
dffef45d FD |
1501 | return; |
1502 | ||
a67ba386 MD |
1503 | desc = event_notifier->priv->parent.desc; |
1504 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1505 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1506 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
e69abdfd | 1507 | desc->tp_class->probe_callback, |
b01155ba FD |
1508 | event_notifier); |
1509 | break; | |
b4a75708 | 1510 | |
606828e4 | 1511 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1512 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); |
1513 | break; | |
b4a75708 | 1514 | |
606828e4 MD |
1515 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
1516 | case LTTNG_KERNEL_ABI_UPROBE: | |
2b16f0c9 FD |
1517 | ret = 0; |
1518 | break; | |
b4a75708 | 1519 | |
606828e4 MD |
1520 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1521 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1522 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1523 | default: |
1524 | WARN_ON_ONCE(1); | |
1525 | } | |
1526 | if (!ret) | |
a67ba386 | 1527 | event_notifier->priv->parent.registered = 1; |
dffef45d FD |
1528 | } |
1529 | ||
1530 | static | |
1531 | int _lttng_event_notifier_unregister( | |
a67ba386 | 1532 | struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1533 | { |
437d5aa5 | 1534 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1535 | int ret = -EINVAL; |
1536 | ||
a67ba386 | 1537 | if (!event_notifier->priv->parent.registered) |
dffef45d FD |
1538 | return 0; |
1539 | ||
a67ba386 MD |
1540 | desc = event_notifier->priv->parent.desc; |
1541 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1542 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1543 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname, |
e69abdfd | 1544 | event_notifier->priv->parent.desc->tp_class->probe_callback, |
b01155ba FD |
1545 | event_notifier); |
1546 | break; | |
b4a75708 | 1547 | |
606828e4 | 1548 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1549 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1550 | ret = 0; | |
1551 | break; | |
b4a75708 | 1552 | |
606828e4 | 1553 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1554 | lttng_uprobes_unregister_event_notifier(event_notifier); |
1555 | ret = 0; | |
1556 | break; | |
b4a75708 | 1557 | |
606828e4 | 1558 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1559 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); |
1560 | break; | |
b4a75708 | 1561 | |
606828e4 MD |
1562 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1563 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1564 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
dffef45d FD |
1565 | default: |
1566 | WARN_ON_ONCE(1); | |
1567 | } | |
1568 | if (!ret) | |
a67ba386 | 1569 | event_notifier->priv->parent.registered = 0; |
dffef45d FD |
1570 | return ret; |
1571 | } | |
1572 | ||
dda6a249 MD |
1573 | /* |
1574 | * Only used internally at session destruction. | |
1575 | */ | |
be066e6c | 1576 | static |
0648898e | 1577 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1578 | { |
0648898e | 1579 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1580 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1581 | ||
0648898e MD |
1582 | lttng_free_event_filter_runtime(event); |
1583 | /* Free event enabler refs */ | |
1584 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1585 | &event_priv->enablers_ref_head, node) | |
1586 | kfree(enabler_ref); | |
b4a75708 | 1587 | |
0648898e MD |
1588 | switch (event->type) { |
1589 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1590 | { | |
1591 | struct lttng_kernel_event_recorder *event_recorder = | |
1592 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1593 | |
0648898e MD |
1594 | switch (event_priv->instrumentation) { |
1595 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1596 | lttng_event_desc_put(event_priv->desc); | |
1597 | break; | |
b4a75708 | 1598 | |
0648898e MD |
1599 | case LTTNG_KERNEL_ABI_KPROBE: |
1600 | module_put(event_priv->desc->owner); | |
1601 | lttng_kprobes_destroy_event_private(event_recorder); | |
1602 | break; | |
b4a75708 | 1603 | |
0648898e MD |
1604 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1605 | module_put(event_priv->desc->owner); | |
1606 | lttng_kretprobes_destroy_private(event_recorder); | |
1607 | break; | |
b4a75708 | 1608 | |
0648898e MD |
1609 | case LTTNG_KERNEL_ABI_SYSCALL: |
1610 | break; | |
4e3c1b9b | 1611 | |
0648898e MD |
1612 | case LTTNG_KERNEL_ABI_UPROBE: |
1613 | module_put(event_priv->desc->owner); | |
1614 | lttng_uprobes_destroy_event_private(event_recorder); | |
1615 | break; | |
3ef5cc03 | 1616 | |
0648898e MD |
1617 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1618 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
1619 | default: | |
1620 | WARN_ON_ONCE(1); | |
1621 | } | |
1622 | list_del(&event_recorder->priv->node); | |
1623 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1624 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1625 | break; |
0648898e MD |
1626 | } |
1627 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1628 | { | |
1629 | struct lttng_kernel_event_notifier *event_notifier = | |
1630 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1631 | |
0648898e MD |
1632 | switch (event_notifier->priv->parent.instrumentation) { |
1633 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1634 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1635 | break; | |
b4a75708 | 1636 | |
0648898e MD |
1637 | case LTTNG_KERNEL_ABI_KPROBE: |
1638 | module_put(event_notifier->priv->parent.desc->owner); | |
1639 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1640 | break; | |
b4a75708 | 1641 | |
0648898e MD |
1642 | case LTTNG_KERNEL_ABI_SYSCALL: |
1643 | break; | |
b4a75708 | 1644 | |
0648898e MD |
1645 | case LTTNG_KERNEL_ABI_UPROBE: |
1646 | module_put(event_notifier->priv->parent.desc->owner); | |
1647 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1648 | break; | |
1649 | ||
1650 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
1651 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1652 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
1653 | default: | |
1654 | WARN_ON_ONCE(1); | |
1655 | } | |
1656 | list_del(&event_notifier->priv->node); | |
1657 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1658 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1659 | break; | |
1660 | } | |
dffef45d FD |
1661 | default: |
1662 | WARN_ON_ONCE(1); | |
1663 | } | |
dffef45d FD |
1664 | } |
1665 | ||
a2fa977a | 1666 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1667 | enum tracker_type tracker_type) |
e0130fab | 1668 | { |
d1f652f8 MD |
1669 | switch (tracker_type) { |
1670 | case TRACKER_PID: | |
1671 | return &session->pid_tracker; | |
1672 | case TRACKER_VPID: | |
1673 | return &session->vpid_tracker; | |
1674 | case TRACKER_UID: | |
1675 | return &session->uid_tracker; | |
1676 | case TRACKER_VUID: | |
1677 | return &session->vuid_tracker; | |
1678 | case TRACKER_GID: | |
1679 | return &session->gid_tracker; | |
1680 | case TRACKER_VGID: | |
1681 | return &session->vgid_tracker; | |
1682 | default: | |
1683 | WARN_ON_ONCE(1); | |
1684 | return NULL; | |
1685 | } | |
1686 | } | |
1687 | ||
a40e3229 | 1688 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1689 | enum tracker_type tracker_type, int id) |
1690 | { | |
a2fa977a | 1691 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1692 | int ret; |
1693 | ||
d1f652f8 MD |
1694 | tracker = get_tracker(session, tracker_type); |
1695 | if (!tracker) | |
1696 | return -EINVAL; | |
1697 | if (id < -1) | |
e0130fab MD |
1698 | return -EINVAL; |
1699 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1700 | if (id == -1) { |
1701 | /* track all ids: destroy tracker. */ | |
1702 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1703 | ret = 0; |
1704 | } else { | |
d1f652f8 | 1705 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1706 | } |
e0130fab MD |
1707 | mutex_unlock(&sessions_mutex); |
1708 | return ret; | |
1709 | } | |
1710 | ||
a40e3229 | 1711 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1712 | enum tracker_type tracker_type, int id) |
e0130fab | 1713 | { |
a2fa977a | 1714 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1715 | int ret; |
1716 | ||
d1f652f8 MD |
1717 | tracker = get_tracker(session, tracker_type); |
1718 | if (!tracker) | |
1719 | return -EINVAL; | |
1720 | if (id < -1) | |
e0130fab MD |
1721 | return -EINVAL; |
1722 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1723 | if (id == -1) { |
1724 | /* untrack all ids: replace by empty tracker. */ | |
1725 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1726 | } else { |
d1f652f8 | 1727 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1728 | } |
e0130fab MD |
1729 | mutex_unlock(&sessions_mutex); |
1730 | return ret; | |
1731 | } | |
1732 | ||
7e6f9ef6 | 1733 | static |
d1f652f8 | 1734 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1735 | { |
a2fa977a MD |
1736 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1737 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1738 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1739 | int iter = 0, i; |
1740 | ||
1741 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1742 | if (id_tracker_p) { |
1743 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1744 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1745 | |
f934e302 | 1746 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1747 | if (iter++ >= *pos) |
1748 | return e; | |
1749 | } | |
1750 | } | |
1751 | } else { | |
d1f652f8 | 1752 | /* ID tracker disabled. */ |
7e6f9ef6 | 1753 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1754 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1755 | } |
1756 | iter++; | |
1757 | } | |
1758 | /* End of list */ | |
1759 | return NULL; | |
1760 | } | |
1761 | ||
1762 | /* Called with sessions_mutex held. */ | |
1763 | static | |
d1f652f8 | 1764 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1765 | { |
a2fa977a MD |
1766 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1767 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1768 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1769 | int iter = 0, i; |
1770 | ||
1771 | (*ppos)++; | |
d1f652f8 MD |
1772 | if (id_tracker_p) { |
1773 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1774 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1775 | |
f934e302 | 1776 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1777 | if (iter++ >= *ppos) |
1778 | return e; | |
1779 | } | |
1780 | } | |
1781 | } else { | |
d1f652f8 | 1782 | /* ID tracker disabled. */ |
7e6f9ef6 | 1783 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1784 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1785 | iter++; |
1786 | } | |
1787 | ||
1788 | /* End of list */ | |
1789 | return NULL; | |
1790 | } | |
1791 | ||
1792 | static | |
d1f652f8 | 1793 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1794 | { |
1795 | mutex_unlock(&sessions_mutex); | |
1796 | } | |
1797 | ||
1798 | static | |
d1f652f8 | 1799 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1800 | { |
a2fa977a MD |
1801 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1802 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1803 | int id; |
7e6f9ef6 | 1804 | |
d1f652f8 | 1805 | if (p == id_tracker_p) { |
7e6f9ef6 | 1806 | /* Tracker disabled. */ |
d1f652f8 | 1807 | id = -1; |
7e6f9ef6 | 1808 | } else { |
d1f652f8 | 1809 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1810 | |
d1f652f8 MD |
1811 | id = lttng_id_tracker_get_node_id(e); |
1812 | } | |
a2fa977a | 1813 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1814 | case TRACKER_PID: |
1815 | seq_printf(m, "process { pid = %d; };\n", id); | |
1816 | break; | |
1817 | case TRACKER_VPID: | |
1818 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1819 | break; | |
1820 | case TRACKER_UID: | |
1821 | seq_printf(m, "user { uid = %d; };\n", id); | |
1822 | break; | |
1823 | case TRACKER_VUID: | |
1824 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1825 | break; | |
1826 | case TRACKER_GID: | |
1827 | seq_printf(m, "group { gid = %d; };\n", id); | |
1828 | break; | |
1829 | case TRACKER_VGID: | |
1830 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1831 | break; | |
1832 | default: | |
1833 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1834 | } |
7e6f9ef6 MD |
1835 | return 0; |
1836 | } | |
1837 | ||
1838 | static | |
d1f652f8 MD |
1839 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1840 | .start = id_list_start, | |
1841 | .next = id_list_next, | |
1842 | .stop = id_list_stop, | |
1843 | .show = id_list_show, | |
7e6f9ef6 MD |
1844 | }; |
1845 | ||
1846 | static | |
d1f652f8 | 1847 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1848 | { |
d1f652f8 | 1849 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1850 | } |
1851 | ||
1852 | static | |
d1f652f8 | 1853 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1854 | { |
1855 | struct seq_file *m = file->private_data; | |
a2fa977a | 1856 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1857 | int ret; |
1858 | ||
d1f652f8 | 1859 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1860 | ret = seq_release(inode, file); |
d1f652f8 | 1861 | if (!ret) |
a2fa977a | 1862 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1863 | return ret; |
1864 | } | |
1865 | ||
d1f652f8 | 1866 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1867 | .owner = THIS_MODULE, |
d1f652f8 | 1868 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1869 | .read = seq_read, |
1870 | .llseek = seq_lseek, | |
d1f652f8 | 1871 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1872 | }; |
1873 | ||
a40e3229 | 1874 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1875 | enum tracker_type tracker_type) |
7e6f9ef6 | 1876 | { |
d1f652f8 | 1877 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1878 | struct seq_file *m; |
1879 | int file_fd, ret; | |
1880 | ||
1881 | file_fd = lttng_get_unused_fd(); | |
1882 | if (file_fd < 0) { | |
1883 | ret = file_fd; | |
1884 | goto fd_error; | |
1885 | } | |
1886 | ||
d1f652f8 MD |
1887 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1888 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1889 | NULL, O_RDWR); |
d1f652f8 MD |
1890 | if (IS_ERR(tracker_ids_list_file)) { |
1891 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1892 | goto file_error; |
1893 | } | |
a40e3229 | 1894 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1895 | ret = -EOVERFLOW; |
9c1f4643 MD |
1896 | goto refcount_error; |
1897 | } | |
d1f652f8 | 1898 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1899 | if (ret < 0) |
1900 | goto open_error; | |
d1f652f8 MD |
1901 | m = tracker_ids_list_file->private_data; |
1902 | ||
1903 | m->private = get_tracker(session, tracker_type); | |
1904 | BUG_ON(!m->private); | |
1905 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1906 | |
1907 | return file_fd; | |
1908 | ||
1909 | open_error: | |
a40e3229 | 1910 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1911 | refcount_error: |
d1f652f8 | 1912 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1913 | file_error: |
1914 | put_unused_fd(file_fd); | |
1915 | fd_error: | |
1916 | return ret; | |
1917 | } | |
1918 | ||
3c997079 MD |
1919 | /* |
1920 | * Enabler management. | |
1921 | */ | |
1922 | static | |
4993071a PP |
1923 | int lttng_match_enabler_star_glob(const char *desc_name, |
1924 | const char *pattern) | |
3c997079 | 1925 | { |
cbc19040 MD |
1926 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1927 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1928 | return 0; |
1929 | return 1; | |
1930 | } | |
1931 | ||
1932 | static | |
4ecb5ad5 MD |
1933 | int lttng_match_enabler_name(const char *desc_name, |
1934 | const char *name) | |
3c997079 | 1935 | { |
4ecb5ad5 | 1936 | if (strcmp(desc_name, name)) |
3c997079 MD |
1937 | return 0; |
1938 | return 1; | |
1939 | } | |
1940 | ||
437d5aa5 | 1941 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
3c997079 MD |
1942 | struct lttng_enabler *enabler) |
1943 | { | |
4ecb5ad5 | 1944 | const char *desc_name, *enabler_name; |
badfe9f5 | 1945 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1946 | |
1947 | enabler_name = enabler->event_param.name; | |
1948 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1949 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1950 | desc_name = desc->event_name; |
3b861b22 FD |
1951 | switch (enabler->format_type) { |
1952 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1953 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1954 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1955 | return lttng_match_enabler_name(desc_name, enabler_name); |
1956 | default: | |
1957 | return -EINVAL; | |
1958 | } | |
4ecb5ad5 | 1959 | break; |
b4a75708 | 1960 | |
606828e4 | 1961 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1962 | desc_name = desc->event_name; |
badfe9f5 | 1963 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1964 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1965 | compat = true; |
1966 | } | |
4ecb5ad5 MD |
1967 | if (!strncmp(desc_name, "syscall_exit_", |
1968 | strlen("syscall_exit_"))) { | |
1969 | desc_name += strlen("syscall_exit_"); | |
1970 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1971 | strlen("syscall_entry_"))) { | |
1972 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1973 | entry = true; |
4ecb5ad5 MD |
1974 | } else { |
1975 | WARN_ON_ONCE(1); | |
1976 | return -EINVAL; | |
1977 | } | |
badfe9f5 | 1978 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1979 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1980 | break; |
606828e4 | 1981 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1982 | if (!entry) |
1983 | return 0; | |
1984 | break; | |
606828e4 | 1985 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1986 | if (entry) |
1987 | return 0; | |
1988 | break; | |
1989 | default: | |
1990 | return -EINVAL; | |
1991 | } | |
1992 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1993 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1994 | break; |
606828e4 | 1995 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1996 | if (compat) |
1997 | return 0; | |
1998 | break; | |
606828e4 | 1999 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
2000 | if (!compat) |
2001 | return 0; | |
2002 | break; | |
2003 | default: | |
2004 | return -EINVAL; | |
2005 | } | |
2006 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2007 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2008 | switch (enabler->format_type) { |
2009 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2010 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2011 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2012 | return lttng_match_enabler_name(desc_name, enabler_name); |
2013 | default: | |
2014 | return -EINVAL; | |
2015 | } | |
2016 | break; | |
606828e4 | 2017 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2018 | return -EINVAL; /* Not implemented. */ |
2019 | default: | |
2020 | return -EINVAL; | |
2021 | } | |
4ecb5ad5 | 2022 | break; |
b4a75708 | 2023 | |
4ecb5ad5 MD |
2024 | default: |
2025 | WARN_ON_ONCE(1); | |
2026 | return -EINVAL; | |
2027 | } | |
3c997079 MD |
2028 | } |
2029 | ||
2030 | static | |
b2bc0bc8 | 2031 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
a67ba386 | 2032 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2033 | { |
b2bc0bc8 FD |
2034 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
2035 | event_enabler); | |
2036 | ||
a67ba386 | 2037 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2038 | return 0; |
a67ba386 MD |
2039 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2040 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2041 | return 1; |
2042 | else | |
2043 | return 0; | |
2044 | } | |
2045 | ||
b01155ba FD |
2046 | static |
2047 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2048 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba FD |
2049 | { |
2050 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
2051 | event_notifier_enabler); | |
2052 | ||
a67ba386 | 2053 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2054 | return 0; |
a67ba386 MD |
2055 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2056 | && event_notifier->priv->group == event_notifier_enabler->group | |
2057 | && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2058 | return 1; |
2059 | else | |
2060 | return 0; | |
2061 | } | |
2062 | ||
3c997079 | 2063 | static |
b2bc0bc8 FD |
2064 | struct lttng_enabler_ref *lttng_enabler_ref( |
2065 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2066 | struct lttng_enabler *enabler) |
2067 | { | |
2068 | struct lttng_enabler_ref *enabler_ref; | |
2069 | ||
b2bc0bc8 | 2070 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2071 | if (enabler_ref->ref == enabler) |
2072 | return enabler_ref; | |
2073 | } | |
2074 | return NULL; | |
2075 | } | |
2076 | ||
3c997079 | 2077 | static |
1b917d6b | 2078 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2079 | { |
ac847066 | 2080 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; |
437d5aa5 MD |
2081 | struct lttng_kernel_probe_desc *probe_desc; |
2082 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2083 | int i; |
2084 | struct list_head *probe_list; | |
2085 | ||
2086 | probe_list = lttng_get_probe_list_head(); | |
2087 | /* | |
2088 | * For each probe event, if we find that a probe event matches | |
2089 | * our enabler, create an associated lttng_event if not | |
2090 | * already present. | |
2091 | */ | |
2092 | list_for_each_entry(probe_desc, probe_list, head) { | |
2093 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2094 | int found = 0; | |
2095 | struct hlist_head *head; | |
a67ba386 MD |
2096 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2097 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2098 | |
2099 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2100 | if (!lttng_desc_match_enabler(desc, |
2101 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2102 | continue; |
3c997079 MD |
2103 | |
2104 | /* | |
2105 | * Check if already created. | |
2106 | */ | |
4a11ef1c | 2107 | head = utils_borrow_hash_table_bucket( |
a40e3229 | 2108 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 2109 | desc->event_name); |
a67ba386 MD |
2110 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2111 | if (event_recorder_private->parent.desc == desc | |
2112 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2113 | found = 1; |
2114 | } | |
2115 | if (found) | |
2116 | continue; | |
2117 | ||
2118 | /* | |
2119 | * We need to create an event for this | |
2120 | * event probe. | |
2121 | */ | |
a67ba386 MD |
2122 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan, |
2123 | NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT); | |
2124 | if (!event_recorder) { | |
5a15f70c | 2125 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2126 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2127 | } |
2128 | } | |
2129 | } | |
2130 | } | |
2131 | ||
b01155ba FD |
2132 | static |
2133 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2134 | { | |
2135 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2136 | struct lttng_kernel_probe_desc *probe_desc; |
2137 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2138 | int i; |
2139 | struct list_head *probe_list; | |
2140 | ||
2141 | probe_list = lttng_get_probe_list_head(); | |
2142 | /* | |
2143 | * For each probe event, if we find that a probe event matches | |
2144 | * our enabler, create an associated lttng_event_notifier if not | |
2145 | * already present. | |
2146 | */ | |
2147 | list_for_each_entry(probe_desc, probe_list, head) { | |
2148 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2149 | int found = 0; | |
2150 | struct hlist_head *head; | |
a67ba386 MD |
2151 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2152 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2153 | |
2154 | desc = probe_desc->event_desc[i]; | |
2155 | if (!lttng_desc_match_enabler(desc, | |
2156 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2157 | continue; | |
2158 | ||
2159 | /* | |
2160 | * Check if already created. | |
2161 | */ | |
2162 | head = utils_borrow_hash_table_bucket( | |
2163 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2164 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2165 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2166 | if (event_notifier_priv->parent.desc == desc | |
2167 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2168 | found = 1; |
2169 | } | |
2170 | if (found) | |
2171 | continue; | |
2172 | ||
2173 | /* | |
2174 | * We need to create a event_notifier for this event probe. | |
2175 | */ | |
2176 | event_notifier = _lttng_event_notifier_create(desc, | |
2177 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2178 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2179 | event_notifier_group, NULL, |
606828e4 | 2180 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2181 | if (IS_ERR(event_notifier)) { |
2182 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2183 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2184 | } |
2185 | } | |
2186 | } | |
2187 | } | |
2188 | ||
33a39a3c | 2189 | static |
1b917d6b | 2190 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2191 | { |
2192 | int ret; | |
2193 | ||
a67ba386 | 2194 | ret = lttng_syscalls_register_event(event_enabler); |
33a39a3c MD |
2195 | WARN_ON_ONCE(ret); |
2196 | } | |
2197 | ||
8a8ac9a8 FD |
2198 | static |
2199 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2200 | { | |
2201 | int ret; | |
2202 | ||
a67ba386 | 2203 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler); |
8a8ac9a8 | 2204 | WARN_ON_ONCE(ret); |
a67ba386 | 2205 | ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler); |
8a8ac9a8 FD |
2206 | WARN_ON_ONCE(ret); |
2207 | } | |
2208 | ||
33a39a3c | 2209 | /* |
a67ba386 | 2210 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2211 | * tracepoint probes. |
2212 | * Should be called with sessions mutex held. | |
2213 | */ | |
2214 | static | |
b2bc0bc8 | 2215 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2216 | { |
b2bc0bc8 | 2217 | switch (event_enabler->base.event_param.instrumentation) { |
606828e4 | 2218 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2219 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2220 | break; |
b4a75708 | 2221 | |
606828e4 | 2222 | case LTTNG_KERNEL_ABI_SYSCALL: |
1b917d6b | 2223 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2224 | break; |
b4a75708 | 2225 | |
33a39a3c MD |
2226 | default: |
2227 | WARN_ON_ONCE(1); | |
2228 | break; | |
2229 | } | |
2230 | } | |
2231 | ||
3c997079 | 2232 | /* |
b2bc0bc8 | 2233 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2234 | * and add backward reference from the event to the enabler. |
2235 | * Should be called with sessions mutex held. | |
2236 | */ | |
2237 | static | |
b2bc0bc8 | 2238 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2239 | { |
ac847066 MD |
2240 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
2241 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; | |
b2bc0bc8 | 2242 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); |
a67ba386 | 2243 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2244 | |
606828e4 MD |
2245 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2246 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2247 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2248 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2249 | int enabled = base_enabler->enabled; |
606828e4 | 2250 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2251 | |
606828e4 | 2252 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
ac847066 | 2253 | WRITE_ONCE(chan->priv->parent.syscall_all_entry, enabled); |
3b82c4e1 | 2254 | |
606828e4 | 2255 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
ac847066 | 2256 | WRITE_ONCE(chan->priv->parent.syscall_all_exit, enabled); |
badfe9f5 MD |
2257 | } |
2258 | ||
3c997079 | 2259 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2260 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2261 | |
b2bc0bc8 | 2262 | /* For each event matching event_enabler in session event list. */ |
a40e3229 | 2263 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2264 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2265 | struct lttng_enabler_ref *enabler_ref; |
2266 | ||
a67ba386 | 2267 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2268 | continue; |
a67ba386 | 2269 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
b2bc0bc8 | 2270 | lttng_event_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2271 | if (!enabler_ref) { |
2272 | /* | |
2273 | * If no backward ref, create it. | |
b2bc0bc8 | 2274 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2275 | */ |
2276 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2277 | if (!enabler_ref) | |
2278 | return -ENOMEM; | |
b2bc0bc8 | 2279 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 | 2280 | list_add(&enabler_ref->node, |
a67ba386 | 2281 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2282 | } |
2283 | ||
f127e61e MD |
2284 | /* |
2285 | * Link filter bytecodes if not linked yet. | |
2286 | */ | |
a67ba386 | 2287 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2288 | lttng_static_ctx, |
a67ba386 | 2289 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
60206944 | 2290 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2291 | } |
2292 | return 0; | |
2293 | } | |
2294 | ||
b01155ba | 2295 | /* |
a67ba386 | 2296 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2297 | * tracepoint probes. |
2298 | * Should be called with sessions mutex held. | |
2299 | */ | |
2300 | static | |
2301 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2302 | { | |
2303 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
606828e4 | 2304 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2305 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2306 | break; | |
b4a75708 | 2307 | |
606828e4 | 2308 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
2309 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); |
2310 | break; | |
b4a75708 | 2311 | |
b01155ba FD |
2312 | default: |
2313 | WARN_ON_ONCE(1); | |
2314 | break; | |
2315 | } | |
2316 | } | |
2317 | ||
2318 | /* | |
2319 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2320 | */ | |
2321 | static | |
8a8ac9a8 FD |
2322 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2323 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2324 | { |
2325 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2326 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2327 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2328 | |
606828e4 MD |
2329 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2330 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2331 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2332 | !strcmp(base_enabler->event_param.name, "*")) { |
2333 | ||
2334 | int enabled = base_enabler->enabled; | |
606828e4 | 2335 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2336 | |
606828e4 | 2337 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2338 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); |
2339 | ||
606828e4 | 2340 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2341 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); |
2342 | ||
2343 | } | |
2344 | ||
b01155ba FD |
2345 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2346 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2347 | ||
2348 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2349 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2350 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2351 | struct lttng_enabler_ref *enabler_ref; |
2352 | ||
2353 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2354 | continue; | |
2355 | ||
a67ba386 | 2356 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2357 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2358 | if (!enabler_ref) { | |
2359 | /* | |
2360 | * If no backward ref, create it. | |
2361 | * Add backward ref from event_notifier to enabler. | |
2362 | */ | |
2363 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2364 | if (!enabler_ref) | |
2365 | return -ENOMEM; | |
2366 | ||
2367 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2368 | event_notifier_enabler); | |
2369 | list_add(&enabler_ref->node, | |
a67ba386 | 2370 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2371 | } |
2372 | ||
2373 | /* | |
2374 | * Link filter bytecodes if not linked yet. | |
2375 | */ | |
a67ba386 MD |
2376 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2377 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2378 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2379 | |
2380 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2381 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2382 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2383 | &event_notifier_enabler->capture_bytecode_head); |
2384 | ||
a67ba386 | 2385 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2386 | } |
2387 | return 0; | |
2388 | } | |
2389 | ||
3c997079 MD |
2390 | /* |
2391 | * Called at module load: connect the probe on all enablers matching | |
2392 | * this event. | |
2393 | * Called with sessions lock held. | |
2394 | */ | |
2395 | int lttng_fix_pending_events(void) | |
2396 | { | |
a40e3229 | 2397 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2398 | |
a40e3229 MD |
2399 | list_for_each_entry(session_priv, &sessions, list) |
2400 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2401 | return 0; |
2402 | } | |
2403 | ||
b01155ba FD |
2404 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2405 | struct lttng_event_notifier_group *event_notifier_group) | |
2406 | { | |
2407 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2408 | ||
2409 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2410 | node) { | |
2411 | if (event_notifier_enabler->base.enabled) | |
2412 | return true; | |
2413 | } | |
2414 | return false; | |
2415 | } | |
2416 | ||
2417 | bool lttng_event_notifier_active(void) | |
2418 | { | |
2419 | struct lttng_event_notifier_group *event_notifier_group; | |
2420 | ||
2421 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2422 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2423 | return true; | |
2424 | } | |
2425 | return false; | |
2426 | } | |
2427 | ||
2428 | int lttng_fix_pending_event_notifiers(void) | |
2429 | { | |
2430 | struct lttng_event_notifier_group *event_notifier_group; | |
2431 | ||
2432 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2433 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2434 | return 0; | |
2435 | } | |
2436 | ||
b2bc0bc8 FD |
2437 | struct lttng_event_enabler *lttng_event_enabler_create( |
2438 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2439 | struct lttng_kernel_abi_event *event_param, |
ac847066 | 2440 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2441 | { |
b2bc0bc8 | 2442 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2443 | |
b2bc0bc8 FD |
2444 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2445 | if (!event_enabler) | |
3c997079 | 2446 | return NULL; |
b2bc0bc8 FD |
2447 | event_enabler->base.format_type = format_type; |
2448 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2449 | memcpy(&event_enabler->base.event_param, event_param, | |
2450 | sizeof(event_enabler->base.event_param)); | |
2451 | event_enabler->chan = chan; | |
3c997079 | 2452 | /* ctx left NULL */ |
b2bc0bc8 | 2453 | event_enabler->base.enabled = 0; |
3c997079 | 2454 | mutex_lock(&sessions_mutex); |
ac847066 MD |
2455 | list_add(&event_enabler->node, &event_enabler->chan->parent.session->priv->enablers_head); |
2456 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); | |
3c997079 | 2457 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2458 | return event_enabler; |
3c997079 MD |
2459 | } |
2460 | ||
b2bc0bc8 | 2461 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2462 | { |
2463 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2464 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
ac847066 | 2465 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2466 | mutex_unlock(&sessions_mutex); |
2467 | return 0; | |
2468 | } | |
2469 | ||
b2bc0bc8 | 2470 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2471 | { |
2472 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2473 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
ac847066 | 2474 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2475 | mutex_unlock(&sessions_mutex); |
2476 | return 0; | |
2477 | } | |
2478 | ||
b2bc0bc8 | 2479 | static |
183e8b3a | 2480 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
606828e4 | 2481 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2482 | { |
9906b046 | 2483 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2484 | uint32_t bytecode_len; |
2485 | int ret; | |
2486 | ||
2487 | ret = get_user(bytecode_len, &bytecode->len); | |
2488 | if (ret) | |
2489 | return ret; | |
52cfcdf3 | 2490 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2491 | GFP_KERNEL); |
2492 | if (!bytecode_node) | |
2493 | return -ENOMEM; | |
2494 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2495 | sizeof(*bytecode) + bytecode_len); | |
2496 | if (ret) | |
2497 | goto error_free; | |
b2bc0bc8 | 2498 | |
8a445457 | 2499 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2500 | bytecode_node->enabler = enabler; |
2501 | /* Enforce length based on allocated size */ | |
2502 | bytecode_node->bc.len = bytecode_len; | |
2503 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2504 | |
07dfc1d0 MD |
2505 | return 0; |
2506 | ||
2507 | error_free: | |
52cfcdf3 | 2508 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2509 | return ret; |
2510 | } | |
2511 | ||
183e8b3a | 2512 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
606828e4 | 2513 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2514 | { |
2515 | int ret; | |
183e8b3a | 2516 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2517 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2518 | if (ret) | |
2519 | goto error; | |
2520 | ||
ac847066 | 2521 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
b2bc0bc8 FD |
2522 | return 0; |
2523 | ||
2524 | error: | |
2525 | return ret; | |
2526 | } | |
2527 | ||
e2d5dbc7 | 2528 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2529 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2530 | { |
2531 | ||
e2d5dbc7 | 2532 | switch (event->priv->instrumentation) { |
606828e4 | 2533 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2534 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2535 | default: |
2536 | return -EINVAL; | |
2537 | } | |
2538 | } | |
2539 | ||
3c997079 MD |
2540 | static |
2541 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2542 | { | |
9906b046 | 2543 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2544 | |
2545 | /* Destroy filter bytecode */ | |
2546 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2547 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2548 | lttng_kvfree(filter_node); |
07dfc1d0 | 2549 | } |
b2bc0bc8 FD |
2550 | } |
2551 | ||
2552 | static | |
2553 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2554 | { | |
2555 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2556 | |
b2bc0bc8 FD |
2557 | list_del(&event_enabler->node); |
2558 | kfree(event_enabler); | |
3c997079 MD |
2559 | } |
2560 | ||
dffef45d FD |
2561 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2562 | struct lttng_event_notifier_group *event_notifier_group, | |
2563 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2564 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2565 | { |
2566 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2567 | ||
2568 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2569 | if (!event_notifier_enabler) | |
2570 | return NULL; | |
2571 | ||
2572 | event_notifier_enabler->base.format_type = format_type; | |
2573 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2574 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2575 | ||
99f52fcc | 2576 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2577 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2578 | |
8a8ac9a8 FD |
2579 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2580 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2581 | |
2582 | event_notifier_enabler->base.enabled = 0; | |
2583 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2584 | event_notifier_enabler->group = event_notifier_group; | |
2585 | ||
2586 | mutex_lock(&sessions_mutex); | |
2587 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2588 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2589 | |
2590 | mutex_unlock(&sessions_mutex); | |
2591 | ||
2592 | return event_notifier_enabler; | |
2593 | } | |
2594 | ||
2595 | int lttng_event_notifier_enabler_enable( | |
2596 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2597 | { | |
2598 | mutex_lock(&sessions_mutex); | |
2599 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2600 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2601 | mutex_unlock(&sessions_mutex); |
2602 | return 0; | |
2603 | } | |
2604 | ||
2605 | int lttng_event_notifier_enabler_disable( | |
2606 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2607 | { | |
2608 | mutex_lock(&sessions_mutex); | |
2609 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2610 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2611 | mutex_unlock(&sessions_mutex); |
2612 | return 0; | |
2613 | } | |
2614 | ||
183e8b3a | 2615 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d | 2616 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
606828e4 | 2617 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
dffef45d FD |
2618 | { |
2619 | int ret; | |
2620 | ||
183e8b3a | 2621 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2622 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2623 | bytecode); | |
2624 | if (ret) | |
2625 | goto error; | |
2626 | ||
b01155ba | 2627 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2628 | return 0; |
2629 | ||
2630 | error: | |
2631 | return ret; | |
2632 | } | |
2633 | ||
99d223ad FD |
2634 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2635 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2636 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2637 | { |
9906b046 | 2638 | struct lttng_kernel_bytecode_node *bytecode_node; |
99d223ad FD |
2639 | struct lttng_enabler *enabler = |
2640 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2641 | uint32_t bytecode_len; | |
2642 | int ret; | |
2643 | ||
2644 | ret = get_user(bytecode_len, &bytecode->len); | |
2645 | if (ret) | |
2646 | return ret; | |
2647 | ||
2648 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2649 | GFP_KERNEL); | |
2650 | if (!bytecode_node) | |
2651 | return -ENOMEM; | |
2652 | ||
2653 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2654 | sizeof(*bytecode) + bytecode_len); | |
2655 | if (ret) | |
2656 | goto error_free; | |
2657 | ||
8a445457 | 2658 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2659 | bytecode_node->enabler = enabler; |
2660 | ||
2661 | /* Enforce length based on allocated size */ | |
2662 | bytecode_node->bc.len = bytecode_len; | |
2663 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2664 | ||
2665 | event_notifier_enabler->num_captures++; | |
2666 | ||
2667 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2668 | goto end; | |
2669 | ||
2670 | error_free: | |
2671 | lttng_kvfree(bytecode_node); | |
2672 | end: | |
2673 | return ret; | |
2674 | } | |
2675 | ||
dffef45d FD |
2676 | static |
2677 | void lttng_event_notifier_enabler_destroy( | |
2678 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2679 | { | |
2680 | if (!event_notifier_enabler) { | |
2681 | return; | |
2682 | } | |
2683 | ||
2684 | list_del(&event_notifier_enabler->node); | |
2685 | ||
2686 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2687 | kfree(event_notifier_enabler); | |
2688 | } | |
2689 | ||
3c997079 | 2690 | /* |
b2bc0bc8 | 2691 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2692 | * session. |
2693 | * Should be called with sessions mutex held. | |
2694 | */ | |
2695 | static | |
a40e3229 | 2696 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2697 | { |
b2bc0bc8 | 2698 | struct lttng_event_enabler *event_enabler; |
a67ba386 | 2699 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2700 | |
a40e3229 | 2701 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2702 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2703 | /* |
2704 | * For each event, if at least one of its enablers is enabled, | |
2705 | * and its channel and session transient states are enabled, we | |
2706 | * enable the event, else we disable it. | |
2707 | */ | |
a40e3229 | 2708 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2709 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2710 | struct lttng_enabler_ref *enabler_ref; |
dc7350d6 | 2711 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2712 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2713 | int nr_filters = 0; | |
3c997079 | 2714 | |
a67ba386 | 2715 | switch (event_recorder_priv->parent.instrumentation) { |
606828e4 MD |
2716 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2717 | case LTTNG_KERNEL_ABI_SYSCALL: | |
3c997079 MD |
2718 | /* Enable events */ |
2719 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2720 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2721 | if (enabler_ref->ref->enabled) { |
2722 | enabled = 1; | |
2723 | break; | |
2724 | } | |
2725 | } | |
4ecb5ad5 | 2726 | break; |
b4a75708 | 2727 | |
4ecb5ad5 | 2728 | default: |
3c997079 MD |
2729 | /* Not handled with lazy sync. */ |
2730 | continue; | |
2731 | } | |
2732 | /* | |
2733 | * Enabled state is based on union of enablers, with | |
2734 | * intesection of session and channel transient enable | |
2735 | * states. | |
2736 | */ | |
ac847066 | 2737 | enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; |
3c997079 | 2738 | |
a67ba386 | 2739 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2740 | /* |
2741 | * Sync tracepoint registration with event enabled | |
2742 | * state. | |
2743 | */ | |
2744 | if (enabled) { | |
a67ba386 | 2745 | register_event(event_recorder); |
3c997079 | 2746 | } else { |
a67ba386 | 2747 | _lttng_event_unregister(event_recorder); |
3c997079 | 2748 | } |
07dfc1d0 MD |
2749 | |
2750 | /* Check if has enablers without bytecode enabled */ | |
2751 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2752 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2753 | if (enabler_ref->ref->enabled |
2754 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2755 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2756 | break; |
2757 | } | |
2758 | } | |
a67ba386 | 2759 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2760 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2761 | |
2762 | /* Enable filters */ | |
2763 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2764 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2765 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2766 | nr_filters++; |
2767 | } | |
2768 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2769 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2770 | } |
2771 | } | |
2772 | ||
2773 | /* | |
2774 | * Apply enablers to session events, adding events to session if need | |
2775 | * be. It is required after each modification applied to an active | |
2776 | * session, and right before session "start". | |
2777 | * "lazy" sync means we only sync if required. | |
2778 | * Should be called with sessions mutex held. | |
2779 | */ | |
2780 | static | |
a40e3229 | 2781 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2782 | { |
2783 | /* We can skip if session is not active */ | |
2784 | if (!session->active) | |
2785 | return; | |
b2bc0bc8 | 2786 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2787 | } |
2788 | ||
b01155ba FD |
2789 | static |
2790 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2791 | { | |
2792 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2793 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2794 | |
2795 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2796 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2797 | ||
2798 | /* | |
2799 | * For each event_notifier, if at least one of its enablers is enabled, | |
2800 | * we enable the event_notifier, else we disable it. | |
2801 | */ | |
a67ba386 MD |
2802 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2803 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2804 | struct lttng_enabler_ref *enabler_ref; |
dc7350d6 | 2805 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2806 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2807 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2808 | |
a67ba386 | 2809 | switch (event_notifier_priv->parent.instrumentation) { |
606828e4 MD |
2810 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2811 | case LTTNG_KERNEL_ABI_SYSCALL: | |
b01155ba FD |
2812 | /* Enable event_notifiers */ |
2813 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2814 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2815 | if (enabler_ref->ref->enabled) { |
2816 | enabled = 1; | |
2817 | break; | |
2818 | } | |
2819 | } | |
2820 | break; | |
b4a75708 | 2821 | |
b01155ba FD |
2822 | default: |
2823 | /* Not handled with sync. */ | |
2824 | continue; | |
2825 | } | |
2826 | ||
a67ba386 | 2827 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2828 | /* |
2829 | * Sync tracepoint registration with event_notifier enabled | |
2830 | * state. | |
2831 | */ | |
2832 | if (enabled) { | |
a67ba386 | 2833 | if (!event_notifier_priv->parent.registered) |
b01155ba FD |
2834 | register_event_notifier(event_notifier); |
2835 | } else { | |
a67ba386 | 2836 | if (event_notifier_priv->parent.registered) |
b01155ba FD |
2837 | _lttng_event_notifier_unregister(event_notifier); |
2838 | } | |
2839 | ||
2840 | /* Check if has enablers without bytecode enabled */ | |
2841 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2842 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2843 | if (enabler_ref->ref->enabled |
2844 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2845 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2846 | break; |
2847 | } | |
2848 | } | |
a67ba386 | 2849 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2850 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2851 | |
2852 | /* Enable filters */ | |
2853 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2854 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2855 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2856 | nr_filters++; |
2857 | } | |
2858 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2859 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2860 | |
2861 | /* Enable captures */ | |
2862 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2863 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2864 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2865 | nr_captures++; |
2866 | } | |
2867 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2868 | } |
2869 | } | |
2870 | ||
1ec3f75a | 2871 | /* |
d83004aa JD |
2872 | * Serialize at most one packet worth of metadata into a metadata |
2873 | * channel. | |
92d9f5e6 MD |
2874 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2875 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2876 | * allows us to do racy operations such as looking for remaining space left in | |
2877 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2878 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2879 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2880 | * Returns the number of bytes written in the channel, 0 if no data |
2881 | * was written and a negative value on error. | |
1ec3f75a | 2882 | */ |
b3b8072b | 2883 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
4071a628 | 2884 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2885 | { |
e27e4381 | 2886 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2887 | int ret = 0; |
2888 | size_t len, reserve_len; | |
2889 | ||
f613e3e6 | 2890 | /* |
92d9f5e6 MD |
2891 | * Ensure we support mutiple get_next / put sequences followed by |
2892 | * put_next. The metadata cache lock protects reading the metadata | |
2893 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2894 | * "flush" operations on the buffer invoked by different processes. | |
2895 | * Moreover, since the metadata cache memory can be reallocated, we | |
2896 | * need to have exclusive access against updates even though we only | |
2897 | * read it. | |
f613e3e6 | 2898 | */ |
92d9f5e6 | 2899 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2900 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2901 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2902 | goto end; |
f613e3e6 | 2903 | |
9616f0bf JD |
2904 | /* Metadata regenerated, change the version. */ |
2905 | if (stream->metadata_cache->version != stream->version) | |
2906 | stream->version = stream->metadata_cache->version; | |
2907 | ||
d83004aa | 2908 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2909 | stream->metadata_in; |
9de2c215 | 2910 | if (!len) |
de23d59d | 2911 | goto end; |
d83004aa | 2912 | reserve_len = min_t(size_t, |
da1fe18f | 2913 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2914 | len); |
a775608d | 2915 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
c7d9db61 | 2916 | sizeof(char), NULL); |
d83004aa JD |
2917 | /* |
2918 | * If reservation failed, return an error to the caller. | |
2919 | */ | |
cefd899f | 2920 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2921 | if (ret != 0) { |
2922 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2923 | stream->coherent = false; |
d83004aa JD |
2924 | goto end; |
2925 | } | |
b3b8072b | 2926 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2927 | stream->metadata_cache->data + stream->metadata_in, |
77fcffef | 2928 | reserve_len, 1); |
b3b8072b | 2929 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2930 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2931 | if (reserve_len < len) |
8b97fd42 MD |
2932 | stream->coherent = false; |
2933 | else | |
2934 | stream->coherent = true; | |
d83004aa JD |
2935 | ret = reserve_len; |
2936 | ||
2937 | end: | |
8b97fd42 MD |
2938 | if (coherent) |
2939 | *coherent = stream->coherent; | |
92d9f5e6 | 2940 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2941 | return ret; |
2942 | } | |
2943 | ||
8b97fd42 | 2944 | static |
a40e3229 | 2945 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2946 | { |
a40e3229 MD |
2947 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2948 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2949 | } |
2950 | ||
2951 | static | |
a40e3229 | 2952 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2953 | { |
a40e3229 MD |
2954 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2955 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2956 | struct lttng_metadata_stream *stream; |
2957 | ||
a40e3229 | 2958 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2959 | wake_up_interruptible(&stream->read_wait); |
a40e3229 | 2960 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2961 | } |
8b97fd42 MD |
2962 | } |
2963 | ||
d83004aa JD |
2964 | /* |
2965 | * Write the metadata to the metadata cache. | |
2966 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2967 | * The metadata cache lock protects us from concurrent read access from |
2968 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2969 | * The content of the printf is printed as a single atomic metadata |
2970 | * transaction. | |
d83004aa | 2971 | */ |
a40e3229 | 2972 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2973 | const char *fmt, ...) |
2974 | { | |
c099397a | 2975 | char *str; |
d83004aa | 2976 | size_t len; |
c099397a MD |
2977 | va_list ap; |
2978 | ||
585e5dcc | 2979 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2980 | |
2981 | va_start(ap, fmt); | |
2982 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2983 | va_end(ap); | |
2984 | if (!str) | |
2985 | return -ENOMEM; | |
2986 | ||
1ec3f75a | 2987 | len = strlen(str); |
a40e3229 MD |
2988 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2989 | if (session->priv->metadata_cache->metadata_written + len > | |
2990 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
2991 | char *tmp_cache_realloc; |
2992 | unsigned int tmp_cache_alloc_size; | |
2993 | ||
2994 | tmp_cache_alloc_size = max_t(unsigned int, | |
a40e3229 MD |
2995 | session->priv->metadata_cache->cache_alloc + len, |
2996 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2997 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2998 | if (!tmp_cache_realloc) |
2999 | goto err; | |
a40e3229 | 3000 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 3001 | memcpy(tmp_cache_realloc, |
a40e3229 MD |
3002 | session->priv->metadata_cache->data, |
3003 | session->priv->metadata_cache->cache_alloc); | |
3004 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
3005 | } |
3006 | ||
a40e3229 MD |
3007 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3008 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3009 | } |
a40e3229 MD |
3010 | memcpy(session->priv->metadata_cache->data + |
3011 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3012 | str, len); |
a40e3229 | 3013 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3014 | kfree(str); |
d83004aa | 3015 | |
d83004aa JD |
3016 | return 0; |
3017 | ||
3018 | err: | |
3019 | kfree(str); | |
3020 | return -ENOMEM; | |
c099397a MD |
3021 | } |
3022 | ||
f513b2bf | 3023 | static |
a40e3229 | 3024 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3025 | { |
3026 | size_t i; | |
3027 | ||
3028 | for (i = 0; i < nesting; i++) { | |
3029 | int ret; | |
3030 | ||
3031 | ret = lttng_metadata_printf(session, " "); | |
3032 | if (ret) { | |
3033 | return ret; | |
3034 | } | |
3035 | } | |
3036 | return 0; | |
3037 | } | |
3038 | ||
ceabb767 | 3039 | static |
a40e3229 | 3040 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3041 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3042 | size_t nesting) |
3043 | { | |
3044 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3045 | } | |
3046 | ||
3047 | static | |
a40e3229 | 3048 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3049 | const struct lttng_kernel_type_integer *type, |
3050 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3051 | size_t nesting) |
3052 | { | |
3053 | int ret; | |
3054 | ||
ceabb767 MD |
3055 | ret = print_tabs(session, nesting); |
3056 | if (ret) | |
3057 | return ret; | |
3058 | ret = lttng_metadata_printf(session, | |
3059 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3060 | type->size, |
3061 | type->alignment, | |
3062 | type->signedness, | |
3063 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3064 | ? "none" |
437d5aa5 | 3065 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3066 | ? "UTF8" |
3067 | : "ASCII", | |
437d5aa5 | 3068 | type->base, |
ceabb767 | 3069 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3070 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3071 | #else |
437d5aa5 | 3072 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3073 | #endif |
3074 | ); | |
3075 | return ret; | |
3076 | } | |
3077 | ||
f513b2bf MD |
3078 | /* |
3079 | * Must be called with sessions_mutex held. | |
3080 | */ | |
3081 | static | |
a40e3229 | 3082 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3083 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3084 | size_t nesting) |
3085 | { | |
f0039724 | 3086 | const char *prev_field_name = NULL; |
f513b2bf MD |
3087 | int ret; |
3088 | uint32_t i, nr_fields; | |
ceabb767 MD |
3089 | unsigned int alignment; |
3090 | ||
f513b2bf MD |
3091 | ret = print_tabs(session, nesting); |
3092 | if (ret) | |
3093 | return ret; | |
3094 | ret = lttng_metadata_printf(session, | |
3095 | "struct {\n"); | |
3096 | if (ret) | |
3097 | return ret; | |
437d5aa5 | 3098 | nr_fields = type->nr_fields; |
f513b2bf | 3099 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3100 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3101 | |
437d5aa5 | 3102 | iter_field = type->fields[i]; |
f0039724 | 3103 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3104 | if (ret) |
3105 | return ret; | |
3106 | } | |
3107 | ret = print_tabs(session, nesting); | |
3108 | if (ret) | |
3109 | return ret; | |
437d5aa5 | 3110 | alignment = type->alignment; |
ceabb767 MD |
3111 | if (alignment) { |
3112 | ret = lttng_metadata_printf(session, | |
3113 | "} align(%u)", | |
3114 | alignment); | |
3115 | } else { | |
3116 | ret = lttng_metadata_printf(session, | |
3117 | "}"); | |
3118 | } | |
f513b2bf MD |
3119 | return ret; |
3120 | } | |
3121 | ||
3122 | /* | |
3123 | * Must be called with sessions_mutex held. | |
3124 | */ | |
3125 | static | |
a40e3229 | 3126 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3127 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3128 | size_t nesting) |
3129 | { | |
3130 | int ret; | |
3131 | ||
3132 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3133 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3134 | if (ret) |
3135 | return ret; | |
ceabb767 | 3136 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3137 | } |
3138 | ||
65c85aa6 MD |
3139 | /* |
3140 | * Must be called with sessions_mutex held. | |
3141 | */ | |
3142 | static | |
a40e3229 | 3143 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3144 | const struct lttng_kernel_type_variant *type, |
f0039724 MD |
3145 | size_t nesting, |
3146 | const char *prev_field_name) | |
65c85aa6 | 3147 | { |
f0039724 | 3148 | const char *tag_name; |
65c85aa6 MD |
3149 | int ret; |
3150 | uint32_t i, nr_choices; | |
3151 | ||
f0039724 MD |
3152 | tag_name = type->tag_name; |
3153 | if (!tag_name) | |
3154 | tag_name = prev_field_name; | |
3155 | if (!tag_name) | |
3156 | return -EINVAL; | |
ceabb767 MD |
3157 | /* |
3158 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3159 | */ | |
437d5aa5 | 3160 | if (type->alignment != 0) |
ceabb767 | 3161 | return -EINVAL; |
65c85aa6 MD |
3162 | ret = print_tabs(session, nesting); |
3163 | if (ret) | |
3164 | return ret; | |
3165 | ret = lttng_metadata_printf(session, | |
3166 | "variant <_%s> {\n", | |
f0039724 | 3167 | tag_name); |
65c85aa6 MD |
3168 | if (ret) |
3169 | return ret; | |
437d5aa5 | 3170 | nr_choices = type->nr_choices; |
65c85aa6 | 3171 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3172 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3173 | |
437d5aa5 | 3174 | iter_field = type->choices[i]; |
f0039724 | 3175 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3176 | if (ret) |
3177 | return ret; | |
3178 | } | |
3179 | ret = print_tabs(session, nesting); | |
3180 | if (ret) | |
3181 | return ret; | |
3182 | ret = lttng_metadata_printf(session, | |
3183 | "}"); | |
3184 | return ret; | |
3185 | } | |
3186 | ||
3187 | /* | |
3188 | * Must be called with sessions_mutex held. | |
3189 | */ | |
3190 | static | |
a40e3229 | 3191 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3192 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3193 | size_t nesting, |
3194 | const char *prev_field_name) | |
65c85aa6 MD |
3195 | { |
3196 | int ret; | |
3197 | ||
3198 | ret = _lttng_variant_type_statedump(session, | |
f0039724 MD |
3199 | lttng_kernel_get_type_variant(field->type), nesting, |
3200 | prev_field_name); | |
65c85aa6 MD |
3201 | if (ret) |
3202 | return ret; | |
ceabb767 | 3203 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3204 | } |
3205 | ||
f513b2bf MD |
3206 | /* |
3207 | * Must be called with sessions_mutex held. | |
3208 | */ | |
3209 | static | |
a40e3229 | 3210 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3211 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3212 | size_t nesting) |
3213 | { | |
3214 | int ret; | |
437d5aa5 MD |
3215 | const struct lttng_kernel_type_array *array_type; |
3216 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3217 | |
437d5aa5 MD |
3218 | array_type = lttng_kernel_get_type_array(field->type); |
3219 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3220 | |
437d5aa5 | 3221 | if (array_type->alignment) { |
ceabb767 | 3222 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3223 | if (ret) |
3224 | return ret; | |
ceabb767 MD |
3225 | ret = lttng_metadata_printf(session, |
3226 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3227 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3228 | field->name); |
3229 | if (ret) | |
3230 | return ret; | |
3231 | } | |
3232 | /* | |
3233 | * Nested compound types: Only array of structures and variants are | |
3234 | * currently supported. | |
3235 | */ | |
437d5aa5 | 3236 | elem_type = array_type->elem_type; |
12bb2edb MD |
3237 | switch (elem_type->type) { |
3238 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3239 | case lttng_kernel_type_struct: |
3240 | case lttng_kernel_type_variant: | |
3241 | ret = _lttng_type_statedump(session, elem_type, | |
3242 | array_type->encoding, nesting); | |
65c85aa6 MD |
3243 | if (ret) |
3244 | return ret; | |
3245 | break; | |
ceabb767 | 3246 | |
f513b2bf MD |
3247 | default: |
3248 | return -EINVAL; | |
3249 | } | |
3250 | ret = lttng_metadata_printf(session, | |
3251 | " _%s[%u];\n", | |
3252 | field->name, | |
437d5aa5 | 3253 | array_type->length); |
f513b2bf MD |
3254 | return ret; |
3255 | } | |
3256 | ||
3257 | /* | |
3258 | * Must be called with sessions_mutex held. | |
3259 | */ | |
3260 | static | |
a40e3229 | 3261 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3262 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3263 | size_t nesting, |
3264 | const char *prev_field_name) | |
f513b2bf MD |
3265 | { |
3266 | int ret; | |
3267 | const char *length_name; | |
437d5aa5 MD |
3268 | const struct lttng_kernel_type_sequence *sequence_type; |
3269 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3270 | |
437d5aa5 MD |
3271 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3272 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3273 | |
437d5aa5 | 3274 | length_name = sequence_type->length_name; |
f0039724 MD |
3275 | if (!length_name) |
3276 | length_name = prev_field_name; | |
3277 | if (!length_name) | |
3278 | return -EINVAL; | |
ceabb767 | 3279 | |
437d5aa5 | 3280 | if (sequence_type->alignment) { |
ceabb767 | 3281 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3282 | if (ret) |
3283 | return ret; | |
ceabb767 MD |
3284 | ret = lttng_metadata_printf(session, |
3285 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3286 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3287 | field->name); |
3288 | if (ret) | |
3289 | return ret; | |
3290 | } | |
3291 | ||
3292 | /* | |
3293 | * Nested compound types: Only array of structures and variants are | |
3294 | * currently supported. | |
3295 | */ | |
437d5aa5 | 3296 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3297 | switch (elem_type->type) { |
3298 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3299 | case lttng_kernel_type_struct: |
3300 | case lttng_kernel_type_variant: | |
3301 | ret = _lttng_type_statedump(session, elem_type, | |
3302 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3303 | if (ret) |
3304 | return ret; | |
3305 | break; | |
ceabb767 | 3306 | |
f513b2bf MD |
3307 | default: |
3308 | return -EINVAL; | |
3309 | } | |
3310 | ret = lttng_metadata_printf(session, | |
3311 | " _%s[ _%s ];\n", | |
3312 | field->name, | |
f0039724 | 3313 | length_name); |
f513b2bf MD |
3314 | return ret; |
3315 | } | |
3316 | ||
141ddf28 MD |
3317 | /* |
3318 | * Must be called with sessions_mutex held. | |
3319 | */ | |
3320 | static | |
a40e3229 | 3321 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3322 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3323 | size_t nesting) |
3324 | { | |
d96a4a7a | 3325 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3326 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3327 | int ret; |
3328 | unsigned int i, nr_entries; | |
3329 | ||
437d5aa5 | 3330 | container_type = type->container_type; |
12bb2edb | 3331 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3332 | ret = -EINVAL; |
3333 | goto end; | |
3334 | } | |
437d5aa5 | 3335 | enum_desc = type->desc; |
141ddf28 MD |
3336 | nr_entries = enum_desc->nr_entries; |
3337 | ||
3338 | ret = print_tabs(session, nesting); | |
3339 | if (ret) | |
3340 | goto end; | |
ceabb767 MD |
3341 | ret = lttng_metadata_printf(session, "enum : "); |
3342 | if (ret) | |
3343 | goto end; | |
437d5aa5 MD |
3344 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3345 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3346 | if (ret) |
ceabb767 MD |
3347 | goto end; |
3348 | ret = lttng_metadata_printf(session, " {\n"); | |
3349 | if (ret) | |
3350 | goto end; | |
141ddf28 MD |
3351 | /* Dump all entries */ |
3352 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3353 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3354 | int j, len; |
3355 | ||
3356 | ret = print_tabs(session, nesting + 1); | |
3357 | if (ret) | |
3358 | goto end; | |
3359 | ret = lttng_metadata_printf(session, | |
3360 | "\""); | |
3361 | if (ret) | |
3362 | goto end; | |
3363 | len = strlen(entry->string); | |
3364 | /* Escape the character '"' */ | |
3365 | for (j = 0; j < len; j++) { | |
3366 | char c = entry->string[j]; | |
3367 | ||
3368 | switch (c) { | |
3369 | case '"': | |
3370 | ret = lttng_metadata_printf(session, | |
3371 | "\\\""); | |
3372 | break; | |
3373 | case '\\': | |
3374 | ret = lttng_metadata_printf(session, | |
3375 | "\\\\"); | |
3376 | break; | |
3377 | default: | |
3378 | ret = lttng_metadata_printf(session, | |
3379 | "%c", c); | |
3380 | break; | |
3381 | } | |
3382 | if (ret) | |
3383 | goto end; | |
3384 | } | |
08ad1061 PP |
3385 | ret = lttng_metadata_printf(session, "\""); |
3386 | if (ret) | |
3387 | goto end; | |
3388 | ||
3389 | if (entry->options.is_auto) { | |
3390 | ret = lttng_metadata_printf(session, ",\n"); | |
3391 | if (ret) | |
3392 | goto end; | |
141ddf28 | 3393 | } else { |
7c559490 MD |
3394 | ret = lttng_metadata_printf(session, |
3395 | " = "); | |
3396 | if (ret) | |
3397 | goto end; | |
3398 | if (entry->start.signedness) | |
141ddf28 | 3399 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3400 | "%lld", (long long) entry->start.value); |
3401 | else | |
3402 | ret = lttng_metadata_printf(session, | |
3403 | "%llu", entry->start.value); | |
3404 | if (ret) | |
3405 | goto end; | |
3406 | if (entry->start.signedness == entry->end.signedness && | |
3407 | entry->start.value | |
3408 | == entry->end.value) { | |
141ddf28 | 3409 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3410 | ",\n"); |
3411 | } else { | |
3412 | if (entry->end.signedness) { | |
3413 | ret = lttng_metadata_printf(session, | |
3414 | " ... %lld,\n", | |
3415 | (long long) entry->end.value); | |
3416 | } else { | |
3417 | ret = lttng_metadata_printf(session, | |
3418 | " ... %llu,\n", | |
3419 | entry->end.value); | |
3420 | } | |
141ddf28 | 3421 | } |
7c559490 MD |
3422 | if (ret) |
3423 | goto end; | |
141ddf28 | 3424 | } |
141ddf28 MD |
3425 | } |
3426 | ret = print_tabs(session, nesting); | |
3427 | if (ret) | |
3428 | goto end; | |
ceabb767 | 3429 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3430 | end: |
3431 | return ret; | |
3432 | } | |
3433 | ||
d83004aa JD |
3434 | /* |
3435 | * Must be called with sessions_mutex held. | |
3436 | */ | |
c099397a | 3437 | static |
a40e3229 | 3438 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3439 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3440 | size_t nesting) |
3441 | { | |
3442 | int ret; | |
437d5aa5 | 3443 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3444 | |
437d5aa5 MD |
3445 | enum_type = lttng_kernel_get_type_enum(field->type); |
3446 | WARN_ON_ONCE(!enum_type); | |
3447 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3448 | if (ret) |
3449 | return ret; | |
3450 | return lttng_field_name_statedump(session, field, nesting); | |
3451 | } | |
3452 | ||
3453 | static | |
a40e3229 | 3454 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3455 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3456 | size_t nesting) |
3457 | { | |
3458 | int ret; | |
3459 | ||
437d5aa5 MD |
3460 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3461 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3462 | if (ret) |
3463 | return ret; | |
3464 | return lttng_field_name_statedump(session, field, nesting); | |
3465 | } | |
3466 | ||
3467 | static | |
a40e3229 | 3468 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3469 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3470 | size_t nesting) |
3471 | { | |
3472 | int ret; | |
3473 | ||
ceabb767 MD |
3474 | /* Default encoding is UTF8 */ |
3475 | ret = print_tabs(session, nesting); | |
3476 | if (ret) | |
3477 | return ret; | |
3478 | ret = lttng_metadata_printf(session, | |
3479 | "string%s", | |
437d5aa5 | 3480 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3481 | " { encoding = ASCII; }" : ""); |
3482 | return ret; | |
3483 | } | |
3484 | ||
3485 | static | |
a40e3229 | 3486 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3487 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3488 | size_t nesting) |
ceabb767 | 3489 | { |
437d5aa5 | 3490 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3491 | int ret; |
3492 | ||
437d5aa5 MD |
3493 | string_type = lttng_kernel_get_type_string(field->type); |
3494 | WARN_ON_ONCE(!string_type); | |
3495 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3496 | if (ret) |
3497 | return ret; | |
3498 | return lttng_field_name_statedump(session, field, nesting); | |
3499 | } | |
3500 | ||
3501 | /* | |
3502 | * Must be called with sessions_mutex held. | |
3503 | */ | |
3504 | static | |
a40e3229 | 3505 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3506 | const struct lttng_kernel_type_common *type, |
3507 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3508 | size_t nesting) |
c099397a | 3509 | { |
c099397a | 3510 | int ret = 0; |
c099397a | 3511 | |
12bb2edb MD |
3512 | switch (type->type) { |
3513 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3514 | ret = _lttng_integer_type_statedump(session, |
3515 | lttng_kernel_get_type_integer(type), | |
3516 | parent_encoding, nesting); | |
8070f5c0 | 3517 | break; |
437d5aa5 MD |
3518 | case lttng_kernel_type_enum: |
3519 | ret = _lttng_enum_type_statedump(session, | |
3520 | lttng_kernel_get_type_enum(type), | |
3521 | nesting); | |
8070f5c0 | 3522 | break; |
12bb2edb | 3523 | case lttng_kernel_type_string: |
437d5aa5 MD |
3524 | ret = _lttng_string_type_statedump(session, |
3525 | lttng_kernel_get_type_string(type), | |
3526 | nesting); | |
ceabb767 | 3527 | break; |
437d5aa5 MD |
3528 | case lttng_kernel_type_struct: |
3529 | ret = _lttng_struct_type_statedump(session, | |
3530 | lttng_kernel_get_type_struct(type), | |
3531 | nesting); | |
8070f5c0 | 3532 | break; |
437d5aa5 MD |
3533 | case lttng_kernel_type_variant: |
3534 | ret = _lttng_variant_type_statedump(session, | |
3535 | lttng_kernel_get_type_variant(type), | |
f0039724 | 3536 | nesting, NULL); |
ceabb767 MD |
3537 | break; |
3538 | ||
3539 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3540 | case lttng_kernel_type_array: |
3541 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3542 | default: |
3543 | WARN_ON_ONCE(1); | |
3544 | return -EINVAL; | |
8070f5c0 | 3545 | } |
ceabb767 MD |
3546 | return ret; |
3547 | } | |
8070f5c0 | 3548 | |
ceabb767 MD |
3549 | /* |
3550 | * Must be called with sessions_mutex held. | |
3551 | */ | |
3552 | static | |
a40e3229 | 3553 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3554 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3555 | size_t nesting, |
3556 | const char **prev_field_name_p) | |
ceabb767 | 3557 | { |
f0039724 | 3558 | const char *prev_field_name = NULL; |
ceabb767 | 3559 | int ret = 0; |
27d2368e | 3560 | |
f0039724 MD |
3561 | if (prev_field_name_p) |
3562 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3563 | switch (field->type->type) { |
12bb2edb | 3564 | case lttng_kernel_type_integer: |
ceabb767 MD |
3565 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3566 | break; | |
437d5aa5 | 3567 | case lttng_kernel_type_enum: |
ceabb767 | 3568 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3569 | break; |
12bb2edb | 3570 | case lttng_kernel_type_string: |
ceabb767 | 3571 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3572 | break; |
437d5aa5 | 3573 | case lttng_kernel_type_struct: |
ceabb767 | 3574 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3575 | break; |
437d5aa5 | 3576 | case lttng_kernel_type_array: |
ceabb767 | 3577 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3578 | break; |
437d5aa5 | 3579 | case lttng_kernel_type_sequence: |
f0039724 | 3580 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3581 | break; |
437d5aa5 | 3582 | case lttng_kernel_type_variant: |
f0039724 | 3583 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3584 | break; |
f513b2bf | 3585 | |
8070f5c0 MD |
3586 | default: |
3587 | WARN_ON_ONCE(1); | |
3588 | return -EINVAL; | |
3589 | } | |
f0039724 MD |
3590 | if (prev_field_name_p) |
3591 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3592 | return ret; |
3593 | } | |
3594 | ||
3595 | static | |
a40e3229 | 3596 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3597 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3598 | { |
f0039724 | 3599 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3600 | int ret = 0; |
3601 | int i; | |
3602 | ||
3603 | if (!ctx) | |
3604 | return 0; | |
3605 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3606 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3607 | |
f0039724 | 3608 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3609 | if (ret) |
3610 | return ret; | |
3611 | } | |
3612 | return ret; | |
3613 | } | |
3614 | ||
3615 | static | |
a40e3229 | 3616 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3617 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3618 | { |
f0039724 | 3619 | const char *prev_field_name = NULL; |
a67ba386 | 3620 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3621 | int ret = 0; |
3622 | int i; | |
3623 | ||
e69abdfd MD |
3624 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3625 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3626 | |
f0039724 | 3627 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3628 | if (ret) |
3629 | return ret; | |
c099397a MD |
3630 | } |
3631 | return ret; | |
3632 | } | |
3633 | ||
d83004aa JD |
3634 | /* |
3635 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3636 | * The entire event metadata is printed as a single atomic metadata |
3637 | * transaction. | |
d83004aa | 3638 | */ |
c099397a | 3639 | static |
a40e3229 | 3640 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 3641 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3642 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3643 | { |
3644 | int ret = 0; | |
3645 | ||
a67ba386 | 3646 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3647 | return 0; |
ac847066 | 3648 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3649 | return 0; |
3650 | ||
8b97fd42 MD |
3651 | lttng_metadata_begin(session); |
3652 | ||
c099397a MD |
3653 | ret = lttng_metadata_printf(session, |
3654 | "event {\n" | |
ae734547 | 3655 | " name = \"%s\";\n" |
c099397a | 3656 | " id = %u;\n" |
b9074a1b | 3657 | " stream_id = %u;\n", |
a67ba386 MD |
3658 | event_recorder->priv->parent.desc->event_name, |
3659 | event_recorder->priv->id, | |
ac847066 | 3660 | event_recorder->chan->priv->id); |
c099397a MD |
3661 | if (ret) |
3662 | goto end; | |
3663 | ||
8070f5c0 | 3664 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3665 | " fields := struct {\n" |
3666 | ); | |
3667 | if (ret) | |
3668 | goto end; | |
3669 | ||
a67ba386 | 3670 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3671 | if (ret) |
3672 | goto end; | |
3673 | ||
3674 | /* | |
3675 | * LTTng space reservation can only reserve multiples of the | |
3676 | * byte size. | |
3677 | */ | |
3678 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3679 | " };\n" |
3680 | "};\n\n"); | |
c099397a MD |
3681 | if (ret) |
3682 | goto end; | |
3683 | ||
a67ba386 | 3684 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3685 | end: |
8b97fd42 | 3686 | lttng_metadata_end(session); |
c099397a MD |
3687 | return ret; |
3688 | ||
3689 | } | |
3690 | ||
d83004aa JD |
3691 | /* |
3692 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3693 | * The entire channel metadata is printed as a single atomic metadata |
3694 | * transaction. | |
d83004aa | 3695 | */ |
c099397a | 3696 | static |
a40e3229 | 3697 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 3698 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3699 | { |
3700 | int ret = 0; | |
3701 | ||
ac847066 | 3702 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3703 | return 0; |
d83004aa | 3704 | |
ac847066 | 3705 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3706 | return 0; |
3707 | ||
8b97fd42 MD |
3708 | lttng_metadata_begin(session); |
3709 | ||
ac847066 | 3710 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3711 | ret = lttng_metadata_printf(session, |
3712 | "stream {\n" | |
3713 | " id = %u;\n" | |
9115fbdc | 3714 | " event.header := %s;\n" |
b9074a1b | 3715 | " packet.context := struct packet_context;\n", |
ac847066 MD |
3716 | chan->priv->id, |
3717 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3718 | "struct event_header_large"); |
3719 | if (ret) | |
3720 | goto end; | |
3721 | ||
ac847066 | 3722 | if (chan->priv->ctx) { |
b9074a1b MD |
3723 | ret = lttng_metadata_printf(session, |
3724 | " event.context := struct {\n"); | |
3725 | if (ret) | |
3726 | goto end; | |
3727 | } | |
ac847066 | 3728 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3729 | if (ret) |
3730 | goto end; | |
ac847066 | 3731 | if (chan->priv->ctx) { |
b9074a1b MD |
3732 | ret = lttng_metadata_printf(session, |
3733 | " };\n"); | |
3734 | if (ret) | |
3735 | goto end; | |
3736 | } | |
8070f5c0 MD |
3737 | |
3738 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3739 | "};\n\n"); |
8070f5c0 | 3740 | |
ac847066 | 3741 | chan->priv->metadata_dumped = 1; |
c099397a | 3742 | end: |
8b97fd42 | 3743 | lttng_metadata_end(session); |
c099397a MD |
3744 | return ret; |
3745 | } | |
3746 | ||
d83004aa JD |
3747 | /* |
3748 | * Must be called with sessions_mutex held. | |
3749 | */ | |
9115fbdc | 3750 | static |
a40e3229 | 3751 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3752 | { |
3753 | return lttng_metadata_printf(session, | |
3754 | "struct packet_context {\n" | |
a3ccff4f MD |
3755 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3756 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3757 | " uint64_t content_size;\n" |
3758 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3759 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3760 | " unsigned long events_discarded;\n" |
9115fbdc | 3761 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3762 | "};\n\n" |
9115fbdc MD |
3763 | ); |
3764 | } | |
3765 | ||
3766 | /* | |
3767 | * Compact header: | |
3768 | * id: range: 0 - 30. | |
3769 | * id 31 is reserved to indicate an extended header. | |
3770 | * | |
3771 | * Large header: | |
3772 | * id: range: 0 - 65534. | |
3773 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3774 | * |
3775 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3776 | */ |
3777 | static | |
a40e3229 | 3778 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3779 | { |
3780 | return lttng_metadata_printf(session, | |
3781 | "struct event_header_compact {\n" | |
3782 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3783 | " variant <id> {\n" | |
3784 | " struct {\n" | |
a3ccff4f | 3785 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3786 | " } compact;\n" |
3787 | " struct {\n" | |
3788 | " uint32_t id;\n" | |
a3ccff4f | 3789 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3790 | " } extended;\n" |
3791 | " } v;\n" | |
3792 | "} align(%u);\n" | |
3793 | "\n" | |
3794 | "struct event_header_large {\n" | |
3795 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3796 | " variant <id> {\n" | |
3797 | " struct {\n" | |
a3ccff4f | 3798 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3799 | " } compact;\n" |
3800 | " struct {\n" | |
3801 | " uint32_t id;\n" | |
a3ccff4f | 3802 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3803 | " } extended;\n" |
3804 | " } v;\n" | |
3805 | "} align(%u);\n\n", | |
a90917c3 MD |
3806 | lttng_alignof(uint32_t) * CHAR_BIT, |
3807 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3808 | ); |
3809 | } | |
3810 | ||
a3ccff4f MD |
3811 | /* |
3812 | * Approximation of NTP time of day to clock monotonic correlation, | |
3813 | * taken at start of trace. | |
3814 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3815 | * in future versions. | |
5283350b MD |
3816 | * This function may return a negative offset. It may happen if the |
3817 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3818 | * |
3819 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3820 | * y2038 compliant. | |
a3ccff4f MD |
3821 | */ |
3822 | static | |
8967b2a3 | 3823 | int64_t measure_clock_offset(void) |
a3ccff4f | 3824 | { |
dcb93448 | 3825 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3826 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3827 | int64_t offset; |
a3ccff4f | 3828 | unsigned long flags; |
3636085f MJ |
3829 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3830 | struct timespec64 rts = { 0, 0 }; | |
3831 | #else | |
3832 | struct timespec rts = { 0, 0 }; | |
3833 | #endif | |
a3ccff4f MD |
3834 | |
3835 | /* Disable interrupts to increase correlation precision. */ | |
3836 | local_irq_save(flags); | |
3837 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3838 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3839 | ktime_get_real_ts64(&rts); | |
3840 | #else | |
216b6baa | 3841 | getnstimeofday(&rts); |
3636085f | 3842 | #endif |
a3ccff4f MD |
3843 | monotonic[1] = trace_clock_read64(); |
3844 | local_irq_restore(flags); | |
3845 | ||
dcb93448 | 3846 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3847 | realtime = (uint64_t) rts.tv_sec * tcf; |
3848 | if (tcf == NSEC_PER_SEC) { | |
3849 | realtime += rts.tv_nsec; | |
3850 | } else { | |
3851 | uint64_t n = rts.tv_nsec * tcf; | |
3852 | ||
3853 | do_div(n, NSEC_PER_SEC); | |
3854 | realtime += n; | |
3855 | } | |
dcb93448 | 3856 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3857 | return offset; |
3858 | } | |
3859 | ||
3eb95be4 | 3860 | static |
a40e3229 | 3861 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3862 | { |
0f3eaad4 | 3863 | int ret = 0; |
3eb95be4 JR |
3864 | size_t i; |
3865 | char cur; | |
3866 | ||
3867 | i = 0; | |
3868 | cur = string[i]; | |
3869 | while (cur != '\0') { | |
3870 | switch (cur) { | |
3871 | case '\n': | |
3872 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3873 | break; | |
3874 | case '\\': | |
3875 | case '"': | |
3876 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3877 | if (ret) | |
3878 | goto error; | |
3879 | /* We still print the current char */ | |
3880 | /* Fallthrough */ | |
3881 | default: | |
3882 | ret = lttng_metadata_printf(session, "%c", cur); | |
3883 | break; | |
3884 | } | |
3885 | ||
3886 | if (ret) | |
3887 | goto error; | |
3888 | ||
3889 | cur = string[++i]; | |
3890 | } | |
3891 | error: | |
3892 | return ret; | |
3893 | } | |
3894 | ||
3895 | static | |
a40e3229 | 3896 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3897 | const char *field_value) |
3eb95be4 JR |
3898 | { |
3899 | int ret; | |
3900 | ||
1c88f269 | 3901 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3902 | if (ret) |
3903 | goto error; | |
3904 | ||
1c88f269 | 3905 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3906 | if (ret) |
3907 | goto error; | |
3908 | ||
3909 | ret = lttng_metadata_printf(session, "\";\n"); | |
3910 | ||
3911 | error: | |
3912 | return ret; | |
3913 | } | |
3914 | ||
c099397a MD |
3915 | /* |
3916 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3917 | * Must be called with sessions_mutex held. |
c099397a MD |
3918 | */ |
3919 | static | |
a40e3229 | 3920 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3921 | { |
a40e3229 | 3922 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3923 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3924 | const char *product_uuid; |
ac847066 | 3925 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3926 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3927 | int ret = 0; |
3928 | ||
585e5dcc | 3929 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3930 | return 0; |
8b97fd42 MD |
3931 | |
3932 | lttng_metadata_begin(session); | |
3933 | ||
a40e3229 | 3934 | if (session->priv->metadata_dumped) |
c099397a | 3935 | goto skip_session; |
c099397a | 3936 | |
d793d5e1 | 3937 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3938 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3939 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3940 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3941 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3942 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3943 | |
3944 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3945 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3946 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3947 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3948 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3949 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3950 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3951 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3952 | "\n" |
3953 | "trace {\n" | |
3954 | " major = %u;\n" | |
3955 | " minor = %u;\n" | |
30bdb6e4 | 3956 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3957 | " byte_order = %s;\n" |
3958 | " packet.header := struct {\n" | |
3959 | " uint32_t magic;\n" | |
1ec3f75a | 3960 | " uint8_t uuid[16];\n" |
d793d5e1 | 3961 | " uint32_t stream_id;\n" |
5594698f | 3962 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3963 | " };\n" |
d793d5e1 | 3964 | "};\n\n", |
a90917c3 MD |
3965 | lttng_alignof(uint8_t) * CHAR_BIT, |
3966 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3967 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3968 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3969 | sizeof(unsigned long) * CHAR_BIT, |
3970 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3971 | CTF_SPEC_MAJOR, |
3972 | CTF_SPEC_MINOR, | |
d793d5e1 | 3973 | uuid_s, |
5214fa50 | 3974 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3975 | "be" |
3976 | #else | |
3977 | "le" | |
3978 | #endif | |
3979 | ); | |
3980 | if (ret) | |
3981 | goto end; | |
3982 | ||
99dc9597 MD |
3983 | ret = lttng_metadata_printf(session, |
3984 | "env {\n" | |
a6058143 | 3985 | " hostname = \"%s\";\n" |
c6c9e10f | 3986 | " domain = \"kernel\";\n" |
99dc9597 | 3987 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3988 | " kernel_release = \"%s\";\n" |
3989 | " kernel_version = \"%s\";\n" | |
3990 | " tracer_name = \"lttng-modules\";\n" | |
3991 | " tracer_major = %d;\n" | |
3992 | " tracer_minor = %d;\n" | |
3993 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3994 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3995 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3996 | utsname()->sysname, |
3997 | utsname()->release, | |
c6c9e10f MD |
3998 | utsname()->version, |
3999 | LTTNG_MODULES_MAJOR_VERSION, | |
4000 | LTTNG_MODULES_MINOR_VERSION, | |
4001 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
4002 | ); |
4003 | if (ret) | |
4004 | goto end; | |
4005 | ||
a40e3229 | 4006 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
4007 | if (ret) |
4008 | goto end; | |
4009 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
a40e3229 | 4010 | session->priv->creation_time); |
3eb95be4 JR |
4011 | if (ret) |
4012 | goto end; | |
4013 | ||
c88f762e GB |
4014 | /* Add the product UUID to the 'env' section */ |
4015 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4016 | if (product_uuid) { | |
4017 | ret = lttng_metadata_printf(session, | |
4018 | " product_uuid = \"%s\";\n", | |
4019 | product_uuid | |
4020 | ); | |
4021 | if (ret) | |
4022 | goto end; | |
4023 | } | |
4024 | ||
4025 | /* Close the 'env' section */ | |
3eb95be4 JR |
4026 | ret = lttng_metadata_printf(session, "};\n\n"); |
4027 | if (ret) | |
4028 | goto end; | |
4029 | ||
a3ccff4f MD |
4030 | ret = lttng_metadata_printf(session, |
4031 | "clock {\n" | |
2754583e MD |
4032 | " name = \"%s\";\n", |
4033 | trace_clock_name() | |
a82c63f1 MD |
4034 | ); |
4035 | if (ret) | |
4036 | goto end; | |
4037 | ||
4038 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4039 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4040 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4041 | clock_uuid_s |
4042 | ); | |
4043 | if (ret) | |
4044 | goto end; | |
4045 | } | |
4046 | ||
4047 | ret = lttng_metadata_printf(session, | |
2754583e | 4048 | " description = \"%s\";\n" |
a3ccff4f MD |
4049 | " freq = %llu; /* Frequency, in Hz */\n" |
4050 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4051 | " offset = %lld;\n" |
a3ccff4f | 4052 | "};\n\n", |
2754583e | 4053 | trace_clock_description(), |
a3ccff4f | 4054 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4055 | (long long) measure_clock_offset() |
a3ccff4f MD |
4056 | ); |
4057 | if (ret) | |
4058 | goto end; | |
4059 | ||
4060 | ret = lttng_metadata_printf(session, | |
4061 | "typealias integer {\n" | |
4062 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4063 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4064 | "} := uint27_clock_monotonic_t;\n" |
4065 | "\n" | |
4066 | "typealias integer {\n" | |
4067 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4068 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4069 | "} := uint32_clock_monotonic_t;\n" |
4070 | "\n" | |
4071 | "typealias integer {\n" | |
4072 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4073 | " map = clock.%s.value;\n" |
a3ccff4f | 4074 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4075 | trace_clock_name(), |
a3ccff4f | 4076 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4077 | trace_clock_name(), |
4078 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4079 | trace_clock_name() | |
a3ccff4f MD |
4080 | ); |
4081 | if (ret) | |
4082 | goto end; | |
4083 | ||
a90917c3 | 4084 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4085 | if (ret) |
4086 | goto end; | |
4087 | ||
a90917c3 | 4088 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4089 | if (ret) |
4090 | goto end; | |
4091 | ||
c099397a | 4092 | skip_session: |
ac847066 MD |
4093 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4094 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4095 | if (ret) |
4096 | goto end; | |
4097 | } | |
4098 | ||
a40e3229 | 4099 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4100 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4101 | event_recorder_priv->pub); | |
c099397a MD |
4102 | if (ret) |
4103 | goto end; | |
4104 | } | |
a40e3229 | 4105 | session->priv->metadata_dumped = 1; |
c099397a | 4106 | end: |
8b97fd42 | 4107 | lttng_metadata_end(session); |
c099397a MD |
4108 | return ret; |
4109 | } | |
4110 | ||
c0e31d2e | 4111 | /** |
a90917c3 | 4112 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4113 | * @transport: transport structure |
4114 | * | |
4115 | * Registers a transport which can be used as output to extract the data out of | |
4116 | * LTTng. The module calling this registration function must ensure that no | |
4117 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4118 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4119 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4120 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4121 | * after its registration must it synchronize the TLBs. |
4122 | */ | |
a90917c3 | 4123 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4124 | { |
4125 | /* | |
4126 | * Make sure no page fault can be triggered by the module about to be | |
4127 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4128 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4129 | */ |
263b6c88 | 4130 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4131 | |
4132 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4133 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4134 | mutex_unlock(&sessions_mutex); |
4135 | } | |
a90917c3 | 4136 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4137 | |
4138 | /** | |
a90917c3 | 4139 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4140 | * @transport: transport structure |
4141 | */ | |
a90917c3 | 4142 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4143 | { |
4144 | mutex_lock(&sessions_mutex); | |
4145 | list_del(&transport->node); | |
4146 | mutex_unlock(&sessions_mutex); | |
4147 | } | |
a90917c3 | 4148 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4149 | |
a101fa10 MD |
4150 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4151 | { | |
4152 | /* | |
4153 | * Make sure no page fault can be triggered by the module about to be | |
4154 | * registered. We deal with this here so we don't have to call | |
4155 | * vmalloc_sync_mappings() in each module's init. | |
4156 | */ | |
4157 | wrapper_vmalloc_sync_mappings(); | |
4158 | ||
4159 | mutex_lock(&sessions_mutex); | |
4160 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4161 | mutex_unlock(&sessions_mutex); | |
4162 | } | |
4163 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4164 | ||
4165 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4166 | { | |
4167 | mutex_lock(&sessions_mutex); | |
4168 | list_del(&transport->node); | |
4169 | mutex_unlock(&sessions_mutex); | |
4170 | } | |
4171 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4172 | ||
5f4c791e | 4173 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4174 | |
4175 | enum cpuhp_state lttng_hp_prepare; | |
4176 | enum cpuhp_state lttng_hp_online; | |
4177 | ||
4178 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4179 | { | |
4180 | struct lttng_cpuhp_node *lttng_node; | |
4181 | ||
4182 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4183 | switch (lttng_node->component) { | |
4184 | case LTTNG_RING_BUFFER_FRONTEND: | |
4185 | return 0; | |
4186 | case LTTNG_RING_BUFFER_BACKEND: | |
4187 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4188 | case LTTNG_RING_BUFFER_ITER: | |
4189 | return 0; | |
4190 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4191 | return 0; | |
4192 | default: | |
4193 | return -EINVAL; | |
4194 | } | |
4195 | } | |
4196 | ||
4197 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4198 | { | |
4199 | struct lttng_cpuhp_node *lttng_node; | |
4200 | ||
4201 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4202 | switch (lttng_node->component) { | |
4203 | case LTTNG_RING_BUFFER_FRONTEND: | |
4204 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4205 | case LTTNG_RING_BUFFER_BACKEND: | |
4206 | return 0; | |
4207 | case LTTNG_RING_BUFFER_ITER: | |
4208 | return 0; | |
4209 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4210 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4211 | default: | |
4212 | return -EINVAL; | |
4213 | } | |
4214 | } | |
4215 | ||
4216 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4217 | { | |
4218 | struct lttng_cpuhp_node *lttng_node; | |
4219 | ||
4220 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4221 | switch (lttng_node->component) { | |
4222 | case LTTNG_RING_BUFFER_FRONTEND: | |
4223 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4224 | case LTTNG_RING_BUFFER_BACKEND: | |
4225 | return 0; | |
4226 | case LTTNG_RING_BUFFER_ITER: | |
4227 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4228 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4229 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4230 | default: | |
4231 | return -EINVAL; | |
4232 | } | |
4233 | } | |
4234 | ||
4235 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4236 | { | |
4237 | struct lttng_cpuhp_node *lttng_node; | |
4238 | ||
4239 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4240 | switch (lttng_node->component) { | |
4241 | case LTTNG_RING_BUFFER_FRONTEND: | |
4242 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4243 | case LTTNG_RING_BUFFER_BACKEND: | |
4244 | return 0; | |
4245 | case LTTNG_RING_BUFFER_ITER: | |
4246 | return 0; | |
4247 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4248 | return 0; | |
4249 | default: | |
4250 | return -EINVAL; | |
4251 | } | |
4252 | } | |
4253 | ||
4254 | static int __init lttng_init_cpu_hotplug(void) | |
4255 | { | |
4256 | int ret; | |
4257 | ||
4258 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4259 | lttng_hotplug_prepare, | |
4260 | lttng_hotplug_dead); | |
4261 | if (ret < 0) { | |
4262 | return ret; | |
4263 | } | |
4264 | lttng_hp_prepare = ret; | |
4265 | lttng_rb_set_hp_prepare(ret); | |
4266 | ||
4267 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4268 | lttng_hotplug_online, | |
4269 | lttng_hotplug_offline); | |
4270 | if (ret < 0) { | |
4271 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4272 | lttng_hp_prepare = 0; | |
4273 | return ret; | |
4274 | } | |
4275 | lttng_hp_online = ret; | |
4276 | lttng_rb_set_hp_online(ret); | |
4277 | ||
4278 | return 0; | |
4279 | } | |
4280 | ||
4281 | static void __exit lttng_exit_cpu_hotplug(void) | |
4282 | { | |
4283 | lttng_rb_set_hp_online(0); | |
4284 | cpuhp_remove_multi_state(lttng_hp_online); | |
4285 | lttng_rb_set_hp_prepare(0); | |
4286 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4287 | } | |
4288 | ||
5f4c791e | 4289 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4290 | static int lttng_init_cpu_hotplug(void) |
4291 | { | |
4292 | return 0; | |
4293 | } | |
4294 | static void lttng_exit_cpu_hotplug(void) | |
4295 | { | |
4296 | } | |
5f4c791e | 4297 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4298 | |
a90917c3 | 4299 | static int __init lttng_events_init(void) |
4e3c1b9b | 4300 | { |
1c25284c MD |
4301 | int ret; |
4302 | ||
453b2495 JD |
4303 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4304 | if (ret) | |
4305 | return ret; | |
389d7070 | 4306 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4307 | if (ret) |
4308 | return ret; | |
4309 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4310 | if (ret) |
4311 | return ret; | |
4312 | ret = lttng_probes_init(); | |
389d7070 MD |
4313 | if (ret) |
4314 | return ret; | |
07dfc1d0 | 4315 | ret = lttng_context_init(); |
20591cf7 MD |
4316 | if (ret) |
4317 | return ret; | |
07dfc1d0 MD |
4318 | ret = lttng_tracepoint_init(); |
4319 | if (ret) | |
4320 | goto error_tp; | |
a67ba386 MD |
4321 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4322 | if (!event_recorder_cache) { | |
20591cf7 | 4323 | ret = -ENOMEM; |
a67ba386 | 4324 | goto error_kmem_event_recorder; |
dffef45d | 4325 | } |
a67ba386 MD |
4326 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4327 | if (!event_recorder_private_cache) { | |
4328 | ret = -ENOMEM; | |
4329 | goto error_kmem_event_recorder_private; | |
4330 | } | |
4331 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4332 | if (!event_notifier_cache) { |
4333 | ret = -ENOMEM; | |
4334 | goto error_kmem_event_notifier; | |
20591cf7 | 4335 | } |
a67ba386 MD |
4336 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4337 | if (!event_notifier_private_cache) { | |
4338 | ret = -ENOMEM; | |
4339 | goto error_kmem_event_notifier_private; | |
4340 | } | |
80996790 | 4341 | ret = lttng_abi_init(); |
02119ee5 MD |
4342 | if (ret) |
4343 | goto error_abi; | |
0c956676 MD |
4344 | ret = lttng_logger_init(); |
4345 | if (ret) | |
4346 | goto error_logger; | |
1e367326 MD |
4347 | ret = lttng_init_cpu_hotplug(); |
4348 | if (ret) | |
4349 | goto error_hotplug; | |
101215b7 | 4350 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4351 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4352 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4353 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4354 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4355 | LTTNG_VERSION_NAME, |
4356 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4357 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4358 | #else | |
4359 | "", | |
4360 | #endif | |
4361 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4362 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4363 | #else | |
4364 | ""); | |
4365 | #endif | |
f73c5a43 MJ |
4366 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4367 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4368 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4369 | return 0; |
0c956676 | 4370 | |
1e367326 MD |
4371 | error_hotplug: |
4372 | lttng_logger_exit(); | |
0c956676 MD |
4373 | error_logger: |
4374 | lttng_abi_exit(); | |
02119ee5 | 4375 | error_abi: |
a67ba386 MD |
4376 | kmem_cache_destroy(event_notifier_private_cache); |
4377 | error_kmem_event_notifier_private: | |
dffef45d FD |
4378 | kmem_cache_destroy(event_notifier_cache); |
4379 | error_kmem_event_notifier: | |
a67ba386 MD |
4380 | kmem_cache_destroy(event_recorder_private_cache); |
4381 | error_kmem_event_recorder_private: | |
4382 | kmem_cache_destroy(event_recorder_cache); | |
4383 | error_kmem_event_recorder: | |
20591cf7 | 4384 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4385 | error_tp: |
4386 | lttng_context_exit(); | |
101215b7 | 4387 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4388 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4389 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4390 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4391 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4392 | LTTNG_VERSION_NAME, |
4393 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4394 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4395 | #else | |
4396 | "", | |
4397 | #endif | |
4398 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4399 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4400 | #else | |
4401 | ""); | |
4402 | #endif | |
1c25284c | 4403 | return ret; |
4e3c1b9b MD |
4404 | } |
4405 | ||
a90917c3 | 4406 | module_init(lttng_events_init); |
11b5a3c2 | 4407 | |
a90917c3 | 4408 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4409 | { |
a40e3229 | 4410 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4411 | |
1e367326 | 4412 | lttng_exit_cpu_hotplug(); |
0c956676 | 4413 | lttng_logger_exit(); |
80996790 | 4414 | lttng_abi_exit(); |
a40e3229 MD |
4415 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4416 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4417 | kmem_cache_destroy(event_recorder_cache); |
4418 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4419 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4420 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4421 | lttng_tracepoint_exit(); |
07dfc1d0 | 4422 | lttng_context_exit(); |
101215b7 | 4423 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4424 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4425 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4426 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4427 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4428 | LTTNG_VERSION_NAME, |
4429 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4430 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4431 | #else | |
4432 | "", | |
4433 | #endif | |
4434 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4435 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4436 | #else | |
4437 | ""); | |
4438 | #endif | |
4e3c1b9b | 4439 | } |
92e94819 | 4440 | |
a90917c3 | 4441 | module_exit(lttng_events_exit); |
11b5a3c2 | 4442 | |
7ca11e77 | 4443 | #include <generated/patches.h> |
101215b7 MJ |
4444 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4445 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4446 | #endif | |
4447 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4448 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4449 | #endif | |
92e94819 MD |
4450 | MODULE_LICENSE("GPL and additional rights"); |
4451 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4452 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4453 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4454 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4455 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4456 | LTTNG_MODULES_EXTRAVERSION); |