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 | |
c570be0d | 31 | #include <wrapper/compiler_attributes.h> |
a7008254 | 32 | #include <wrapper/uuid.h> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
34 | #include <wrapper/random.h> |
35 | #include <wrapper/tracepoint.h> | |
36 | #include <wrapper/list.h> | |
cbc19040 | 37 | #include <wrapper/types.h> |
2df37e95 MD |
38 | #include <lttng/kernel-version.h> |
39 | #include <lttng/events.h> | |
92bc1e23 | 40 | #include <lttng/events-internal.h> |
0b365677 | 41 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 42 | #include <lttng/tracer.h> |
21f58fb7 | 43 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
44 | #include <lttng/abi-old.h> |
45 | #include <lttng/endian.h> | |
46 | #include <lttng/string-utils.h> | |
4a11ef1c | 47 | #include <lttng/utils.h> |
24591303 MD |
48 | #include <ringbuffer/backend.h> |
49 | #include <ringbuffer/frontend.h> | |
3636085f | 50 | #include <wrapper/time.h> |
4e3c1b9b | 51 | |
d83004aa JD |
52 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
53 | ||
4e3c1b9b | 54 | static LIST_HEAD(sessions); |
750b05f2 | 55 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 56 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 57 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
58 | /* |
59 | * Protect the sessions and metadata caches. | |
60 | */ | |
4e3c1b9b | 61 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
62 | static struct kmem_cache *event_recorder_cache; |
63 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 64 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 65 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 66 | |
a40e3229 MD |
67 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
68 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b2bc0bc8 | 69 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); |
dffef45d | 70 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 71 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 72 | |
0648898e | 73 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
ac847066 | 74 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
38b35aff MD |
75 | static void _lttng_event_unregister(struct lttng_kernel_event_recorder *event); |
76 | static void _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier); | |
c099397a | 77 | static |
a40e3229 | 78 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 79 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 80 | struct lttng_kernel_event_recorder *event); |
c099397a | 81 | static |
a40e3229 | 82 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
83 | static |
84 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 85 | static |
a40e3229 | 86 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
87 | const struct lttng_kernel_type_common *type, |
88 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
89 | size_t nesting); |
90 | static | |
a40e3229 | 91 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 92 | const struct lttng_kernel_event_field *field, |
f0039724 | 93 | size_t nesting, const char **prev_field_name_p); |
c099397a | 94 | |
c099397a | 95 | void synchronize_trace(void) |
abcca994 | 96 | { |
57acf405 MJ |
97 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
98 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
99 | synchronize_rcu(); |
100 | #else | |
abcca994 | 101 | synchronize_sched(); |
92da05ce MJ |
102 | #endif |
103 | ||
5f4c791e | 104 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
105 | #ifdef CONFIG_PREEMPT_RT_FULL |
106 | synchronize_rcu(); | |
107 | #endif | |
5f4c791e | 108 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
109 | #ifdef CONFIG_PREEMPT_RT |
110 | synchronize_rcu(); | |
111 | #endif | |
5f4c791e | 112 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
113 | } |
114 | ||
3c997079 MD |
115 | void lttng_lock_sessions(void) |
116 | { | |
117 | mutex_lock(&sessions_mutex); | |
118 | } | |
119 | ||
120 | void lttng_unlock_sessions(void) | |
121 | { | |
122 | mutex_unlock(&sessions_mutex); | |
123 | } | |
124 | ||
9fe593d2 FD |
125 | static struct lttng_transport *lttng_transport_find(const char *name) |
126 | { | |
127 | struct lttng_transport *transport; | |
128 | ||
129 | list_for_each_entry(transport, <tng_transport_list, node) { | |
130 | if (!strcmp(transport->name, name)) | |
131 | return transport; | |
132 | } | |
133 | return NULL; | |
134 | } | |
135 | ||
3c997079 MD |
136 | /* |
137 | * Called with sessions lock held. | |
138 | */ | |
139 | int lttng_session_active(void) | |
140 | { | |
a40e3229 | 141 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
142 | |
143 | list_for_each_entry(iter, &sessions, list) { | |
a40e3229 | 144 | if (iter->pub->active) |
3c997079 MD |
145 | return 1; |
146 | } | |
147 | return 0; | |
148 | } | |
149 | ||
a40e3229 | 150 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 151 | { |
a40e3229 MD |
152 | struct lttng_kernel_session *session; |
153 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 154 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 155 | int i; |
4e3c1b9b MD |
156 | |
157 | mutex_lock(&sessions_mutex); | |
a40e3229 | 158 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 159 | if (!session) |
d83004aa | 160 | goto err; |
a40e3229 MD |
161 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
162 | if (!session_priv) | |
163 | goto err_free_session; | |
164 | session->priv = session_priv; | |
165 | session_priv->pub = session; | |
166 | ||
167 | INIT_LIST_HEAD(&session_priv->chan); | |
168 | INIT_LIST_HEAD(&session_priv->events); | |
169 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
170 | |
171 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
172 | GFP_KERNEL); | |
173 | if (!metadata_cache) | |
a40e3229 | 174 | goto err_free_session_private; |
0ca42eb7 | 175 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
176 | if (!metadata_cache->data) |
177 | goto err_free_cache; | |
178 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
179 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 180 | mutex_init(&metadata_cache->lock); |
a40e3229 | 181 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 182 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
a40e3229 | 183 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 184 | sizeof(metadata_cache->uuid)); |
a40e3229 | 185 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 186 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
a40e3229 MD |
187 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
188 | list_add(&session_priv->list, &sessions); | |
189 | ||
a2fa977a MD |
190 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
191 | goto tracker_alloc_error; | |
192 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
193 | goto tracker_alloc_error; | |
194 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
195 | goto tracker_alloc_error; | |
196 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
197 | goto tracker_alloc_error; | |
198 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
199 | goto tracker_alloc_error; | |
200 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
201 | goto tracker_alloc_error; | |
202 | ||
4e3c1b9b | 203 | mutex_unlock(&sessions_mutex); |
a40e3229 | 204 | |
4e3c1b9b | 205 | return session; |
d83004aa | 206 | |
a2fa977a MD |
207 | tracker_alloc_error: |
208 | lttng_id_tracker_fini(&session->pid_tracker); | |
209 | lttng_id_tracker_fini(&session->vpid_tracker); | |
210 | lttng_id_tracker_fini(&session->uid_tracker); | |
211 | lttng_id_tracker_fini(&session->vuid_tracker); | |
212 | lttng_id_tracker_fini(&session->gid_tracker); | |
213 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
214 | err_free_cache: |
215 | kfree(metadata_cache); | |
a40e3229 MD |
216 | err_free_session_private: |
217 | lttng_kvfree(session_priv); | |
d83004aa | 218 | err_free_session: |
48f5e0b5 | 219 | lttng_kvfree(session); |
d83004aa JD |
220 | err: |
221 | mutex_unlock(&sessions_mutex); | |
222 | return NULL; | |
223 | } | |
224 | ||
99f52fcc FD |
225 | static |
226 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
227 | { | |
228 | struct lttng_counter_transport *transport; | |
229 | ||
230 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
231 | if (!strcmp(transport->name, name)) | |
232 | return transport; | |
233 | } | |
234 | return NULL; | |
235 | } | |
236 | ||
237 | struct lttng_counter *lttng_kernel_counter_create( | |
238 | const char *counter_transport_name, | |
239 | size_t number_dimensions, const size_t *dimensions_sizes) | |
240 | { | |
241 | struct lttng_counter *counter = NULL; | |
242 | struct lttng_counter_transport *counter_transport = NULL; | |
243 | ||
244 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
245 | if (!counter_transport) { | |
246 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
247 | counter_transport_name); | |
248 | goto notransport; | |
249 | } | |
250 | if (!try_module_get(counter_transport->owner)) { | |
251 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
252 | goto notransport; | |
253 | } | |
254 | ||
255 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
256 | if (!counter) | |
257 | goto nomem; | |
258 | ||
259 | /* Create event notifier error counter. */ | |
260 | counter->ops = &counter_transport->ops; | |
261 | counter->transport = counter_transport; | |
262 | ||
263 | counter->counter = counter->ops->counter_create( | |
264 | number_dimensions, dimensions_sizes, 0); | |
265 | if (!counter->counter) { | |
266 | goto create_error; | |
267 | } | |
268 | ||
269 | return counter; | |
270 | ||
271 | create_error: | |
272 | lttng_kvfree(counter); | |
273 | nomem: | |
274 | if (counter_transport) | |
275 | module_put(counter_transport->owner); | |
276 | notransport: | |
277 | return NULL; | |
278 | } | |
279 | ||
750b05f2 FD |
280 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
281 | { | |
282 | struct lttng_transport *transport = NULL; | |
283 | struct lttng_event_notifier_group *event_notifier_group; | |
284 | const char *transport_name = "relay-event-notifier"; | |
285 | size_t subbuf_size = 4096; //TODO | |
286 | size_t num_subbuf = 16; //TODO | |
287 | unsigned int switch_timer_interval = 0; | |
288 | unsigned int read_timer_interval = 0; | |
dffef45d | 289 | int i; |
750b05f2 FD |
290 | |
291 | mutex_lock(&sessions_mutex); | |
292 | ||
293 | transport = lttng_transport_find(transport_name); | |
294 | if (!transport) { | |
295 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
296 | transport_name); | |
297 | goto notransport; | |
298 | } | |
299 | if (!try_module_get(transport->owner)) { | |
300 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
301 | transport_name); | |
302 | goto notransport; | |
303 | } | |
304 | ||
305 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
306 | GFP_KERNEL); | |
307 | if (!event_notifier_group) | |
308 | goto nomem; | |
309 | ||
310 | /* | |
311 | * Initialize the ring buffer used to store event notifier | |
312 | * notifications. | |
313 | */ | |
314 | event_notifier_group->ops = &transport->ops; | |
da1fe18f | 315 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
316 | transport_name, event_notifier_group, NULL, |
317 | subbuf_size, num_subbuf, switch_timer_interval, | |
318 | read_timer_interval); | |
319 | if (!event_notifier_group->chan) | |
320 | goto create_error; | |
321 | ||
322 | event_notifier_group->transport = transport; | |
dffef45d FD |
323 | |
324 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
325 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
326 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
327 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
328 | ||
750b05f2 FD |
329 | list_add(&event_notifier_group->node, &event_notifier_groups); |
330 | ||
331 | mutex_unlock(&sessions_mutex); | |
332 | ||
333 | return event_notifier_group; | |
334 | ||
335 | create_error: | |
336 | lttng_kvfree(event_notifier_group); | |
337 | nomem: | |
338 | if (transport) | |
339 | module_put(transport->owner); | |
340 | notransport: | |
341 | mutex_unlock(&sessions_mutex); | |
342 | return NULL; | |
343 | } | |
344 | ||
d83004aa JD |
345 | void metadata_cache_destroy(struct kref *kref) |
346 | { | |
347 | struct lttng_metadata_cache *cache = | |
348 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 349 | vfree(cache->data); |
d83004aa | 350 | kfree(cache); |
4e3c1b9b MD |
351 | } |
352 | ||
a40e3229 | 353 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 354 | { |
ac847066 | 355 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 356 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 357 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 358 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 359 | int ret; |
4e3c1b9b MD |
360 | |
361 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 362 | WRITE_ONCE(session->active, 0); |
ac847066 MD |
363 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
364 | ret = lttng_syscalls_unregister_channel(chan_priv->pub); | |
1ec65de1 MD |
365 | WARN_ON(ret); |
366 | } | |
38b35aff MD |
367 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) |
368 | _lttng_event_unregister(event_recorder_priv->pub); | |
abcca994 | 369 | synchronize_trace(); /* Wait for in-flight events to complete */ |
ac847066 MD |
370 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
371 | ret = lttng_syscalls_destroy_event(chan_priv->pub); | |
badfe9f5 MD |
372 | WARN_ON(ret); |
373 | } | |
b2bc0bc8 | 374 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
a40e3229 | 375 | &session->priv->enablers_head, node) |
b2bc0bc8 | 376 | lttng_event_enabler_destroy(event_enabler); |
a40e3229 | 377 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node) |
0648898e | 378 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
ac847066 MD |
379 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
380 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
381 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 382 | } |
a40e3229 MD |
383 | mutex_lock(&session->priv->metadata_cache->lock); |
384 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 385 | _lttng_metadata_channel_hangup(metadata_stream); |
a40e3229 | 386 | mutex_unlock(&session->priv->metadata_cache->lock); |
a2fa977a MD |
387 | lttng_id_tracker_fini(&session->pid_tracker); |
388 | lttng_id_tracker_fini(&session->vpid_tracker); | |
389 | lttng_id_tracker_fini(&session->uid_tracker); | |
390 | lttng_id_tracker_fini(&session->vuid_tracker); | |
391 | lttng_id_tracker_fini(&session->gid_tracker); | |
392 | lttng_id_tracker_fini(&session->vgid_tracker); | |
a40e3229 MD |
393 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
394 | list_del(&session->priv->list); | |
4e3c1b9b | 395 | mutex_unlock(&sessions_mutex); |
a40e3229 | 396 | lttng_kvfree(session->priv); |
48f5e0b5 | 397 | lttng_kvfree(session); |
4e3c1b9b MD |
398 | } |
399 | ||
dffef45d FD |
400 | void lttng_event_notifier_group_destroy( |
401 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 402 | { |
dffef45d | 403 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
a67ba386 | 404 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
405 | int ret; |
406 | ||
750b05f2 FD |
407 | if (!event_notifier_group) |
408 | return; | |
409 | ||
410 | mutex_lock(&sessions_mutex); | |
dffef45d | 411 | |
3b82c4e1 | 412 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
413 | WARN_ON(ret); |
414 | ||
a67ba386 | 415 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
38b35aff MD |
416 | &event_notifier_group->event_notifiers_head, node) |
417 | _lttng_event_notifier_unregister(event_notifier_priv->pub); | |
dffef45d | 418 | |
b01155ba FD |
419 | /* Wait for in-flight event notifier to complete */ |
420 | synchronize_trace(); | |
421 | ||
21f58fb7 FD |
422 | irq_work_sync(&event_notifier_group->wakeup_pending); |
423 | ||
8a8ac9a8 FD |
424 | kfree(event_notifier_group->sc_filter); |
425 | ||
dffef45d FD |
426 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
427 | &event_notifier_group->enablers_head, node) | |
428 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
429 | ||
a67ba386 MD |
430 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
431 | &event_notifier_group->event_notifiers_head, node) | |
0648898e | 432 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 433 | |
99f52fcc FD |
434 | if (event_notifier_group->error_counter) { |
435 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 436 | |
99f52fcc FD |
437 | error_counter->ops->counter_destroy(error_counter->counter); |
438 | module_put(error_counter->transport->owner); | |
439 | lttng_kvfree(error_counter); | |
440 | event_notifier_group->error_counter = NULL; | |
441 | } | |
442 | ||
da1fe18f | 443 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
444 | module_put(event_notifier_group->transport->owner); |
445 | list_del(&event_notifier_group->node); | |
dffef45d | 446 | |
750b05f2 FD |
447 | mutex_unlock(&sessions_mutex); |
448 | lttng_kvfree(event_notifier_group); | |
449 | } | |
450 | ||
a40e3229 | 451 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
452 | { |
453 | int ret; | |
454 | ||
455 | mutex_lock(&sessions_mutex); | |
456 | ret = lttng_statedump_start(session); | |
457 | mutex_unlock(&sessions_mutex); | |
458 | return ret; | |
459 | } | |
460 | ||
a40e3229 | 461 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
462 | { |
463 | int ret = 0; | |
ac847066 | 464 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
465 | |
466 | mutex_lock(&sessions_mutex); | |
467 | if (session->active) { | |
468 | ret = -EBUSY; | |
469 | goto end; | |
470 | } | |
c099397a | 471 | |
3c997079 | 472 | /* Set transient enabler state to "enabled" */ |
a40e3229 | 473 | session->priv->tstate = 1; |
3c997079 | 474 | |
4ef81e4a | 475 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 476 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 477 | |
c099397a MD |
478 | /* |
479 | * Snapshot the number of events per channel to know the type of header | |
480 | * we need to use. | |
481 | */ | |
ac847066 MD |
482 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
483 | if (chan_priv->header_type) | |
484 | continue; /* don't change it if session stop/restart */ | |
485 | if (chan_priv->free_event_id < 31) | |
486 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 487 | else |
ac847066 | 488 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
489 | } |
490 | ||
64af2437 | 491 | /* Clear each stream's quiescent state. */ |
ac847066 MD |
492 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
493 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
494 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 495 | } |
64af2437 | 496 | |
a8f2d0c7 | 497 | WRITE_ONCE(session->active, 1); |
a40e3229 | 498 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 499 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 500 | if (ret) { |
a8f2d0c7 | 501 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
502 | goto end; |
503 | } | |
504 | ret = lttng_statedump_start(session); | |
360f38ea | 505 | if (ret) |
a8f2d0c7 | 506 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
507 | end: |
508 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 509 | return ret; |
c0e31d2e MD |
510 | } |
511 | ||
a40e3229 | 512 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
513 | { |
514 | int ret = 0; | |
ac847066 | 515 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
516 | |
517 | mutex_lock(&sessions_mutex); | |
518 | if (!session->active) { | |
519 | ret = -EBUSY; | |
520 | goto end; | |
521 | } | |
a8f2d0c7 | 522 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
523 | |
524 | /* Set transient enabler state to "disabled" */ | |
a40e3229 | 525 | session->priv->tstate = 0; |
b2bc0bc8 | 526 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
527 | |
528 | /* Set each stream's quiescent state. */ | |
ac847066 MD |
529 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
530 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
531 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 532 | } |
c0e31d2e MD |
533 | end: |
534 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 535 | return ret; |
c0e31d2e MD |
536 | } |
537 | ||
a40e3229 | 538 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
539 | { |
540 | int ret = 0; | |
ac847066 | 541 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 542 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
a40e3229 | 543 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
544 | struct lttng_metadata_stream *stream; |
545 | ||
546 | mutex_lock(&sessions_mutex); | |
547 | if (!session->active) { | |
548 | ret = -EBUSY; | |
549 | goto end; | |
550 | } | |
551 | ||
552 | mutex_lock(&cache->lock); | |
553 | memset(cache->data, 0, cache->cache_alloc); | |
554 | cache->metadata_written = 0; | |
555 | cache->version++; | |
a40e3229 | 556 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
557 | stream->metadata_out = 0; |
558 | stream->metadata_in = 0; | |
559 | } | |
560 | mutex_unlock(&cache->lock); | |
561 | ||
a40e3229 | 562 | session->priv->metadata_dumped = 0; |
ac847066 MD |
563 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
564 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
565 | } |
566 | ||
a40e3229 | 567 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 568 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
569 | } |
570 | ||
571 | ret = _lttng_session_metadata_statedump(session); | |
572 | ||
573 | end: | |
574 | mutex_unlock(&sessions_mutex); | |
575 | return ret; | |
576 | } | |
577 | ||
ac847066 | 578 | int lttng_channel_enable(struct lttng_kernel_channel_buffer *channel) |
e64957da | 579 | { |
3c997079 | 580 | int ret = 0; |
e64957da | 581 | |
3c997079 | 582 | mutex_lock(&sessions_mutex); |
ac847066 | 583 | if (channel->priv->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
584 | ret = -EPERM; |
585 | goto end; | |
586 | } | |
ac847066 | 587 | if (channel->parent.enabled) { |
3c997079 MD |
588 | ret = -EEXIST; |
589 | goto end; | |
590 | } | |
591 | /* Set transient enabler state to "enabled" */ | |
ac847066 MD |
592 | channel->priv->parent.tstate = 1; |
593 | lttng_session_sync_event_enablers(channel->parent.session); | |
3c997079 | 594 | /* Set atomically the state to "enabled" */ |
ac847066 | 595 | WRITE_ONCE(channel->parent.enabled, 1); |
3c997079 MD |
596 | end: |
597 | mutex_unlock(&sessions_mutex); | |
598 | return ret; | |
e64957da MD |
599 | } |
600 | ||
ac847066 | 601 | int lttng_channel_disable(struct lttng_kernel_channel_buffer *channel) |
e64957da | 602 | { |
3c997079 | 603 | int ret = 0; |
e64957da | 604 | |
3c997079 | 605 | mutex_lock(&sessions_mutex); |
ac847066 | 606 | if (channel->priv->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
607 | ret = -EPERM; |
608 | goto end; | |
609 | } | |
ac847066 | 610 | if (!channel->parent.enabled) { |
3c997079 MD |
611 | ret = -EEXIST; |
612 | goto end; | |
613 | } | |
614 | /* Set atomically the state to "disabled" */ | |
ac847066 | 615 | WRITE_ONCE(channel->parent.enabled, 0); |
3c997079 | 616 | /* Set transient enabler state to "enabled" */ |
ac847066 MD |
617 | channel->priv->parent.tstate = 0; |
618 | lttng_session_sync_event_enablers(channel->parent.session); | |
3c997079 MD |
619 | end: |
620 | mutex_unlock(&sessions_mutex); | |
621 | return ret; | |
e64957da MD |
622 | } |
623 | ||
9d993668 | 624 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 625 | { |
3c997079 | 626 | int ret = 0; |
e64957da | 627 | |
3c997079 | 628 | mutex_lock(&sessions_mutex); |
9d993668 MD |
629 | switch (event->type) { |
630 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
631 | { | |
632 | struct lttng_kernel_event_recorder *event_recorder = | |
633 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
634 | ||
ac847066 | 635 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
636 | ret = -EPERM; |
637 | goto end; | |
638 | } | |
a0493bef | 639 | break; |
9d993668 MD |
640 | } |
641 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
642 | switch (event->priv->instrumentation) { | |
643 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
644 | ret = -EINVAL; | |
645 | goto end; | |
646 | default: | |
647 | break; | |
648 | } | |
a0493bef MD |
649 | break; |
650 | default: | |
9d993668 | 651 | break; |
a0493bef | 652 | } |
e64957da | 653 | |
9d993668 | 654 | if (event->enabled) { |
3c997079 MD |
655 | ret = -EEXIST; |
656 | goto end; | |
657 | } | |
a67ba386 | 658 | switch (event->priv->instrumentation) { |
c570be0d MJ |
659 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
660 | lttng_fallthrough; | |
606828e4 | 661 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
662 | ret = -EINVAL; |
663 | break; | |
b4a75708 | 664 | |
c570be0d MJ |
665 | case LTTNG_KERNEL_ABI_KPROBE: |
666 | lttng_fallthrough; | |
606828e4 | 667 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 668 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 669 | break; |
b4a75708 | 670 | |
606828e4 | 671 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 672 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 673 | break; |
b4a75708 | 674 | |
c570be0d MJ |
675 | case LTTNG_KERNEL_ABI_FUNCTION: |
676 | lttng_fallthrough; | |
677 | case LTTNG_KERNEL_ABI_NOOP: | |
678 | lttng_fallthrough; | |
a0493bef MD |
679 | default: |
680 | WARN_ON_ONCE(1); | |
681 | ret = -EINVAL; | |
682 | } | |
3c997079 MD |
683 | end: |
684 | mutex_unlock(&sessions_mutex); | |
685 | return ret; | |
e64957da MD |
686 | } |
687 | ||
9d993668 | 688 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
689 | { |
690 | int ret = 0; | |
691 | ||
692 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
693 | switch (event->type) { |
694 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
695 | { | |
696 | struct lttng_kernel_event_recorder *event_recorder = | |
697 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
698 | ||
ac847066 | 699 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
700 | ret = -EPERM; |
701 | goto end; | |
702 | } | |
b01155ba | 703 | break; |
9d993668 MD |
704 | } |
705 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
706 | switch (event->priv->instrumentation) { | |
707 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
708 | ret = -EINVAL; | |
709 | goto end; | |
710 | default: | |
711 | break; | |
712 | } | |
2b16f0c9 | 713 | break; |
dffef45d | 714 | default: |
9d993668 | 715 | break; |
dffef45d | 716 | } |
dffef45d | 717 | |
a67ba386 | 718 | if (!event->enabled) { |
dffef45d FD |
719 | ret = -EEXIST; |
720 | goto end; | |
721 | } | |
a67ba386 | 722 | switch (event->priv->instrumentation) { |
c570be0d MJ |
723 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
724 | lttng_fallthrough; | |
606828e4 | 725 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
726 | ret = -EINVAL; |
727 | break; | |
b4a75708 | 728 | |
c570be0d MJ |
729 | case LTTNG_KERNEL_ABI_KPROBE: |
730 | lttng_fallthrough; | |
606828e4 | 731 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 732 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 733 | break; |
b4a75708 | 734 | |
9d993668 MD |
735 | case LTTNG_KERNEL_ABI_KRETPROBE: |
736 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
737 | break; | |
738 | ||
c570be0d MJ |
739 | case LTTNG_KERNEL_ABI_FUNCTION: |
740 | lttng_fallthrough; | |
741 | case LTTNG_KERNEL_ABI_NOOP: | |
742 | lttng_fallthrough; | |
dffef45d FD |
743 | default: |
744 | WARN_ON_ONCE(1); | |
745 | ret = -EINVAL; | |
746 | } | |
747 | end: | |
748 | mutex_unlock(&sessions_mutex); | |
749 | return ret; | |
750 | } | |
751 | ||
ac847066 | 752 | struct lttng_kernel_channel_buffer *lttng_channel_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
753 | const char *transport_name, |
754 | void *buf_addr, | |
4e3c1b9b MD |
755 | size_t subbuf_size, size_t num_subbuf, |
756 | unsigned int switch_timer_interval, | |
d83004aa JD |
757 | unsigned int read_timer_interval, |
758 | enum channel_type channel_type) | |
4e3c1b9b | 759 | { |
ac847066 MD |
760 | struct lttng_kernel_channel_buffer *chan; |
761 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 762 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
763 | |
764 | mutex_lock(&sessions_mutex); | |
a40e3229 | 765 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 766 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 767 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 768 | if (!transport) { |
5a15f70c | 769 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 770 | transport_name); |
c0e31d2e | 771 | goto notransport; |
f3d01b96 | 772 | } |
a33c9927 | 773 | if (!try_module_get(transport->owner)) { |
5a15f70c | 774 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
775 | goto notransport; |
776 | } | |
ac847066 | 777 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 778 | if (!chan) |
c0e31d2e | 779 | goto nomem; |
ac847066 MD |
780 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
781 | if (!chan_priv) | |
782 | goto nomem_priv; | |
783 | chan->priv = chan_priv; | |
784 | chan_priv->pub = chan; | |
785 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
786 | chan->parent.session = session; | |
787 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 788 | chan->ops = &transport->ops; |
125b4df4 MD |
789 | /* |
790 | * Note: the channel creation op already writes into the packet | |
791 | * headers. Therefore the "chan" information used as input | |
792 | * should be already accessible. | |
793 | */ | |
ac847066 | 794 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
795 | chan, buf_addr, subbuf_size, num_subbuf, |
796 | switch_timer_interval, read_timer_interval); | |
ac847066 | 797 | if (!chan->priv->rb_chan) |
f3d01b96 | 798 | goto create_error; |
ac847066 MD |
799 | chan->priv->parent.tstate = 1; |
800 | chan->parent.enabled = 1; | |
801 | chan->priv->transport = transport; | |
802 | chan->priv->channel_type = channel_type; | |
803 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
804 | mutex_unlock(&sessions_mutex); |
805 | return chan; | |
806 | ||
f3d01b96 | 807 | create_error: |
ac847066 MD |
808 | kfree(chan_priv); |
809 | nomem_priv: | |
f3d01b96 | 810 | kfree(chan); |
c0e31d2e | 811 | nomem: |
a33c9927 MD |
812 | if (transport) |
813 | module_put(transport->owner); | |
c0e31d2e | 814 | notransport: |
e5382b6d | 815 | active: |
4e3c1b9b MD |
816 | mutex_unlock(&sessions_mutex); |
817 | return NULL; | |
818 | } | |
819 | ||
820 | /* | |
d83004aa JD |
821 | * Only used internally at session destruction for per-cpu channels, and |
822 | * when metadata channel is released. | |
823 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 824 | */ |
aa7c23a9 | 825 | static |
ac847066 | 826 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 827 | { |
ac847066 MD |
828 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
829 | module_put(chan->priv->transport->owner); | |
830 | list_del(&chan->priv->node); | |
831 | lttng_kernel_destroy_context(chan->priv->ctx); | |
832 | kfree(chan->priv); | |
4e3c1b9b MD |
833 | kfree(chan); |
834 | } | |
835 | ||
ac847066 | 836 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 837 | { |
ac847066 | 838 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
839 | |
840 | /* Protect the metadata cache with the sessions_mutex. */ | |
841 | mutex_lock(&sessions_mutex); | |
842 | _lttng_channel_destroy(chan); | |
843 | mutex_unlock(&sessions_mutex); | |
844 | } | |
845 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
846 | ||
847 | static | |
848 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
849 | { | |
850 | stream->finalized = 1; | |
851 | wake_up_interruptible(&stream->read_wait); | |
852 | } | |
853 | ||
a101fa10 | 854 | |
e5382b6d MD |
855 | /* |
856 | * Supports event creation while tracing session is active. | |
3c997079 | 857 | * Needs to be called with sessions mutex held. |
e5382b6d | 858 | */ |
ac847066 | 859 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan, |
606828e4 | 860 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 861 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 862 | enum lttng_kernel_abi_instrumentation itype) |
4e3c1b9b | 863 | { |
ac847066 | 864 | struct lttng_kernel_session *session = chan->parent.session; |
a67ba386 MD |
865 | struct lttng_kernel_event_recorder *event_recorder; |
866 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
867 | const char *event_name; |
868 | struct hlist_head *head; | |
3d084699 | 869 | int ret; |
4e3c1b9b | 870 | |
ac847066 | 871 | if (chan->priv->free_event_id == -1U) { |
4cf0bf51 | 872 | ret = -EMFILE; |
e5382b6d | 873 | goto full; |
abc0446a | 874 | } |
3c997079 MD |
875 | |
876 | switch (itype) { | |
606828e4 | 877 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 878 | event_name = event_desc->event_name; |
3c997079 | 879 | break; |
b4a75708 | 880 | |
c570be0d MJ |
881 | case LTTNG_KERNEL_ABI_KPROBE: |
882 | lttng_fallthrough; | |
883 | case LTTNG_KERNEL_ABI_UPROBE: | |
884 | lttng_fallthrough; | |
885 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
886 | lttng_fallthrough; | |
606828e4 | 887 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
888 | event_name = event_param->name; |
889 | break; | |
b4a75708 | 890 | |
c570be0d MJ |
891 | case LTTNG_KERNEL_ABI_FUNCTION: |
892 | lttng_fallthrough; | |
893 | case LTTNG_KERNEL_ABI_NOOP: | |
894 | lttng_fallthrough; | |
3c997079 MD |
895 | default: |
896 | WARN_ON_ONCE(1); | |
897 | ret = -EINVAL; | |
898 | goto type_error; | |
899 | } | |
4a11ef1c | 900 | |
a40e3229 | 901 | head = utils_borrow_hash_table_bucket(session->priv->events_ht.table, |
4a11ef1c | 902 | LTTNG_EVENT_HT_SIZE, event_name); |
a67ba386 MD |
903 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
904 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
905 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 906 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 907 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
908 | ret = -EEXIST; |
909 | goto exist; | |
abc0446a MD |
910 | } |
911 | } | |
3c997079 | 912 | |
a67ba386 MD |
913 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
914 | if (!event_recorder) { | |
4cf0bf51 | 915 | ret = -ENOMEM; |
4e3c1b9b | 916 | goto cache_error; |
abc0446a | 917 | } |
a67ba386 MD |
918 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
919 | if (!event_recorder_priv) { | |
920 | ret = -ENOMEM; | |
921 | goto cache_private_error; | |
922 | } | |
923 | event_recorder_priv->pub = event_recorder; | |
924 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
925 | event_recorder->priv = event_recorder_priv; | |
926 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
927 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
928 | ||
8a445457 | 929 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 930 | event_recorder->chan = chan; |
ac847066 | 931 | event_recorder->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
932 | event_recorder->priv->parent.instrumentation = itype; |
933 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
934 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
935 | |
936 | switch (itype) { | |
606828e4 | 937 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 938 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
939 | event_recorder->parent.enabled = 0; |
940 | event_recorder->priv->parent.registered = 0; | |
941 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
942 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 943 | ret = -ENOENT; |
d3dbe23c | 944 | goto register_error; |
abc0446a | 945 | } |
3c997079 MD |
946 | /* Populate lttng_event structure before event registration. */ |
947 | smp_wmb(); | |
baf20995 | 948 | break; |
b4a75708 | 949 | |
606828e4 | 950 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
951 | /* |
952 | * Needs to be explicitly enabled after creation, since | |
953 | * we may want to apply filters. | |
954 | */ | |
a67ba386 MD |
955 | event_recorder->parent.enabled = 0; |
956 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
957 | /* |
958 | * Populate lttng_event structure before event | |
959 | * registration. | |
960 | */ | |
961 | smp_wmb(); | |
8bf17deb | 962 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
963 | event_param->u.kprobe.symbol_name, |
964 | event_param->u.kprobe.offset, | |
965 | event_param->u.kprobe.addr, | |
a67ba386 | 966 | event_recorder); |
abc0446a | 967 | if (ret) { |
4cf0bf51 | 968 | ret = -EINVAL; |
d6d808f3 | 969 | goto register_error; |
abc0446a | 970 | } |
a67ba386 | 971 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 972 | WARN_ON_ONCE(!ret); |
d6d808f3 | 973 | break; |
b4a75708 | 974 | |
606828e4 | 975 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 976 | { |
a67ba386 MD |
977 | struct lttng_kernel_event_recorder *event_recorder_return; |
978 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
979 | |
980 | /* kretprobe defines 2 events */ | |
a0493bef MD |
981 | /* |
982 | * Needs to be explicitly enabled after creation, since | |
983 | * we may want to apply filters. | |
984 | */ | |
a67ba386 MD |
985 | event_recorder->parent.enabled = 0; |
986 | event_recorder->priv->parent.registered = 1; | |
987 | ||
988 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
989 | if (!event_recorder_return) { | |
990 | ret = -ENOMEM; | |
991 | goto register_error; | |
992 | } | |
993 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
994 | if (!event_recorder_return_priv) { | |
995 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 996 | ret = -ENOMEM; |
7371f44c | 997 | goto register_error; |
abc0446a | 998 | } |
a67ba386 MD |
999 | event_recorder_return_priv->pub = event_recorder_return; |
1000 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
1001 | event_recorder_return->priv = event_recorder_return_priv; | |
1002 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
1003 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
1004 | ||
8a445457 | 1005 | event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 1006 | event_recorder_return->chan = chan; |
ac847066 | 1007 | event_recorder_return->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
1008 | event_recorder_return->priv->parent.instrumentation = itype; |
1009 | event_recorder_return->parent.enabled = 0; | |
1010 | event_recorder_return->priv->parent.registered = 1; | |
1011 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
1012 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 1013 | /* |
a90917c3 | 1014 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1015 | */ |
1016 | smp_wmb(); | |
3c997079 | 1017 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1018 | event_param->u.kretprobe.symbol_name, |
1019 | event_param->u.kretprobe.offset, | |
1020 | event_param->u.kretprobe.addr, | |
a67ba386 | 1021 | event_recorder, event_recorder_return); |
7371f44c | 1022 | if (ret) { |
a67ba386 MD |
1023 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1024 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1025 | ret = -EINVAL; |
7371f44c MD |
1026 | goto register_error; |
1027 | } | |
1028 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1029 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1030 | WARN_ON_ONCE(!ret); |
a67ba386 | 1031 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1032 | WARN_ON_ONCE(!ret); |
ac847066 | 1033 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, |
a67ba386 | 1034 | event_recorder_return); |
abc0446a | 1035 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1036 | if (ret) { |
a67ba386 MD |
1037 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1038 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
1039 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1040 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1041 | goto statedump_error; |
1042 | } | |
ac847066 | 1043 | list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events); |
7371f44c MD |
1044 | break; |
1045 | } | |
b4a75708 | 1046 | |
606828e4 | 1047 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1048 | /* |
1049 | * Needs to be explicitly enabled after creation, since | |
1050 | * we may want to apply filters. | |
1051 | */ | |
a67ba386 MD |
1052 | event_recorder->parent.enabled = 0; |
1053 | event_recorder->priv->parent.registered = 0; | |
1054 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1055 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1056 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1057 | ret = -EINVAL; |
1058 | goto register_error; | |
606828e4 | 1059 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1060 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1061 | break; |
606828e4 | 1062 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1063 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1064 | break; |
1065 | } | |
1066 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1067 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1068 | ret = -EINVAL; |
1069 | goto register_error; | |
606828e4 | 1070 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1071 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1072 | break; |
606828e4 | 1073 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1074 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1075 | break; |
1076 | } | |
a67ba386 | 1077 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1078 | ret = -EINVAL; |
259b6cb3 | 1079 | goto register_error; |
abc0446a | 1080 | } |
1ec65de1 | 1081 | break; |
b4a75708 | 1082 | |
606828e4 | 1083 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1084 | /* |
1085 | * Needs to be explicitly enabled after creation, since | |
1086 | * we may want to apply filters. | |
1087 | */ | |
a67ba386 MD |
1088 | event_recorder->parent.enabled = 0; |
1089 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1090 | |
a344f64b FD |
1091 | /* |
1092 | * Populate lttng_event structure before event | |
1093 | * registration. | |
1094 | */ | |
1095 | smp_wmb(); | |
149b9a9d | 1096 | |
83b802dc | 1097 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1098 | event_param->u.uprobe.fd, |
a67ba386 | 1099 | event_recorder); |
149b9a9d YB |
1100 | if (ret) |
1101 | goto register_error; | |
a67ba386 | 1102 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1103 | WARN_ON_ONCE(!ret); |
1104 | break; | |
b4a75708 | 1105 | |
c570be0d MJ |
1106 | case LTTNG_KERNEL_ABI_FUNCTION: |
1107 | lttng_fallthrough; | |
1108 | case LTTNG_KERNEL_ABI_NOOP: | |
1109 | lttng_fallthrough; | |
baf20995 MD |
1110 | default: |
1111 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1112 | ret = -EINVAL; |
df07930b | 1113 | goto register_error; |
baf20995 | 1114 | } |
ac847066 | 1115 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder); |
abc0446a MD |
1116 | WARN_ON_ONCE(ret > 0); |
1117 | if (ret) { | |
c099397a | 1118 | goto statedump_error; |
abc0446a | 1119 | } |
a67ba386 | 1120 | hlist_add_head(&event_recorder->priv->hlist, head); |
ac847066 | 1121 | list_add(&event_recorder->priv->node, &chan->parent.session->priv->events); |
a67ba386 | 1122 | return event_recorder; |
4e3c1b9b | 1123 | |
c099397a | 1124 | statedump_error: |
259b6cb3 | 1125 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1126 | register_error: |
a67ba386 MD |
1127 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1128 | cache_private_error: | |
1129 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1130 | cache_error: |
1131 | exist: | |
3c997079 | 1132 | type_error: |
e5382b6d | 1133 | full: |
4cf0bf51 | 1134 | return ERR_PTR(ret); |
4e3c1b9b MD |
1135 | } |
1136 | ||
a67ba386 | 1137 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1138 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1139 | uint64_t token, uint64_t error_counter_index, |
1140 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1141 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1142 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1143 | { |
a67ba386 MD |
1144 | struct lttng_kernel_event_notifier *event_notifier; |
1145 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1146 | struct lttng_counter *error_counter; |
dffef45d FD |
1147 | const char *event_name; |
1148 | struct hlist_head *head; | |
1149 | int ret; | |
1150 | ||
1151 | switch (itype) { | |
606828e4 | 1152 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1153 | event_name = event_desc->event_name; |
b01155ba | 1154 | break; |
b4a75708 | 1155 | |
c570be0d MJ |
1156 | case LTTNG_KERNEL_ABI_KPROBE: |
1157 | lttng_fallthrough; | |
1158 | case LTTNG_KERNEL_ABI_UPROBE: | |
1159 | lttng_fallthrough; | |
606828e4 | 1160 | case LTTNG_KERNEL_ABI_SYSCALL: |
2b16f0c9 FD |
1161 | event_name = event_notifier_param->event.name; |
1162 | break; | |
b4a75708 | 1163 | |
c570be0d MJ |
1164 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1165 | lttng_fallthrough; | |
1166 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1167 | lttng_fallthrough; | |
1168 | case LTTNG_KERNEL_ABI_NOOP: | |
1169 | lttng_fallthrough; | |
dffef45d FD |
1170 | default: |
1171 | WARN_ON_ONCE(1); | |
1172 | ret = -EINVAL; | |
1173 | goto type_error; | |
1174 | } | |
1175 | ||
1176 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1177 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
a67ba386 MD |
1178 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1179 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1180 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1181 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1182 | && event_notifier_group == event_notifier_priv->group |
1183 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1184 | ret = -EEXIST; |
1185 | goto exist; | |
1186 | } | |
1187 | } | |
1188 | ||
1189 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1190 | if (!event_notifier) { | |
1191 | ret = -ENOMEM; | |
1192 | goto cache_error; | |
1193 | } | |
a67ba386 MD |
1194 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1195 | if (!event_notifier_priv) { | |
1196 | ret = -ENOMEM; | |
1197 | goto cache_private_error; | |
1198 | } | |
1199 | event_notifier_priv->pub = event_notifier; | |
1200 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1201 | event_notifier->priv = event_notifier_priv; | |
1202 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1203 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1204 | ||
1205 | event_notifier->priv->group = event_notifier_group; | |
1206 | event_notifier->priv->parent.user_token = token; | |
1207 | event_notifier->priv->error_counter_index = error_counter_index; | |
1208 | event_notifier->priv->num_captures = 0; | |
1209 | event_notifier->priv->parent.instrumentation = itype; | |
1210 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1211 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1212 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1213 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
8a445457 | 1214 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; |
dffef45d FD |
1215 | |
1216 | switch (itype) { | |
606828e4 | 1217 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1218 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1219 | event_notifier->parent.enabled = 0; |
1220 | event_notifier->priv->parent.registered = 0; | |
1221 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1222 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1223 | ret = -ENOENT; |
1224 | goto register_error; | |
1225 | } | |
1226 | /* Populate lttng_event_notifier structure before event registration. */ | |
1227 | smp_wmb(); | |
1228 | break; | |
b4a75708 | 1229 | |
606828e4 | 1230 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1231 | /* |
1232 | * Needs to be explicitly enabled after creation, since | |
1233 | * we may want to apply filters. | |
1234 | */ | |
a67ba386 MD |
1235 | event_notifier->parent.enabled = 0; |
1236 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1237 | /* |
1238 | * Populate lttng_event_notifier structure before event | |
1239 | * registration. | |
1240 | */ | |
1241 | smp_wmb(); | |
1242 | ret = lttng_kprobes_register_event_notifier( | |
1243 | event_notifier_param->event.u.kprobe.symbol_name, | |
1244 | event_notifier_param->event.u.kprobe.offset, | |
1245 | event_notifier_param->event.u.kprobe.addr, | |
1246 | event_notifier); | |
1247 | if (ret) { | |
1248 | ret = -EINVAL; | |
1249 | goto register_error; | |
1250 | } | |
a67ba386 | 1251 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1252 | WARN_ON_ONCE(!ret); |
1253 | break; | |
b4a75708 | 1254 | |
606828e4 | 1255 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1256 | /* |
1257 | * Needs to be explicitly enabled after creation, since | |
1258 | * we may want to apply filters. | |
1259 | */ | |
a67ba386 MD |
1260 | event_notifier->parent.enabled = 0; |
1261 | event_notifier->priv->parent.registered = 0; | |
1262 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1263 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1264 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1265 | ret = -EINVAL; |
1266 | goto register_error; | |
606828e4 | 1267 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1268 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1269 | break; |
606828e4 | 1270 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1271 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1272 | break; |
1273 | } | |
1274 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1275 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1276 | ret = -EINVAL; |
1277 | goto register_error; | |
606828e4 | 1278 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1279 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1280 | break; |
606828e4 | 1281 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1282 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1283 | break; |
1284 | } | |
1285 | ||
a67ba386 | 1286 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1287 | ret = -EINVAL; |
1288 | goto register_error; | |
1289 | } | |
1290 | break; | |
b4a75708 | 1291 | |
606828e4 | 1292 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1293 | /* |
1294 | * Needs to be explicitly enabled after creation, since | |
1295 | * we may want to apply filters. | |
1296 | */ | |
a67ba386 MD |
1297 | event_notifier->parent.enabled = 0; |
1298 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1299 | |
1300 | /* | |
1301 | * Populate lttng_event_notifier structure before | |
1302 | * event_notifier registration. | |
1303 | */ | |
1304 | smp_wmb(); | |
1305 | ||
1306 | ret = lttng_uprobes_register_event_notifier( | |
1307 | event_notifier_param->event.name, | |
1308 | event_notifier_param->event.u.uprobe.fd, | |
1309 | event_notifier); | |
1310 | if (ret) | |
1311 | goto register_error; | |
a67ba386 | 1312 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1313 | WARN_ON_ONCE(!ret); |
1314 | break; | |
b4a75708 | 1315 | |
c570be0d MJ |
1316 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1317 | lttng_fallthrough; | |
1318 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1319 | lttng_fallthrough; | |
1320 | case LTTNG_KERNEL_ABI_NOOP: | |
1321 | lttng_fallthrough; | |
dffef45d FD |
1322 | default: |
1323 | WARN_ON_ONCE(1); | |
1324 | ret = -EINVAL; | |
1325 | goto register_error; | |
1326 | } | |
1327 | ||
a67ba386 MD |
1328 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1329 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1330 | |
1331 | /* | |
1332 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1333 | * bucket is currently in use. We trust it. The session lock |
1334 | * synchronizes against concurrent creation of the error | |
1335 | * counter. | |
99f52fcc | 1336 | */ |
ab04d7b1 MD |
1337 | error_counter = event_notifier_group->error_counter; |
1338 | if (error_counter) { | |
99f52fcc FD |
1339 | size_t dimension_index[1]; |
1340 | ||
1341 | /* | |
1342 | * Check that the index is within the boundary of the counter. | |
1343 | */ | |
a67ba386 | 1344 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1345 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1346 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1347 | ret = -EINVAL; |
1348 | goto register_error; | |
1349 | } | |
1350 | ||
a67ba386 | 1351 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1352 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1353 | if (ret) { |
1354 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1355 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1356 | goto register_error; |
1357 | } | |
1358 | } | |
1359 | ||
dffef45d FD |
1360 | return event_notifier; |
1361 | ||
1362 | register_error: | |
a67ba386 MD |
1363 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1364 | cache_private_error: | |
dffef45d FD |
1365 | kmem_cache_free(event_notifier_cache, event_notifier); |
1366 | cache_error: | |
1367 | exist: | |
1368 | type_error: | |
1369 | return ERR_PTR(ret); | |
1370 | } | |
1371 | ||
99f52fcc FD |
1372 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1373 | const size_t *dim_indexes, int32_t cpu, | |
1374 | int64_t *val, bool *overflow, bool *underflow) | |
1375 | { | |
1376 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1377 | cpu, val, overflow, underflow); | |
1378 | } | |
1379 | ||
1380 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1381 | const size_t *dim_indexes, int64_t *val, | |
1382 | bool *overflow, bool *underflow) | |
1383 | { | |
1384 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1385 | val, overflow, underflow); | |
1386 | } | |
1387 | ||
1388 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1389 | const size_t *dim_indexes) | |
1390 | { | |
1391 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1392 | } | |
1393 | ||
ac847066 | 1394 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan, |
606828e4 | 1395 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 1396 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 1397 | enum lttng_kernel_abi_instrumentation itype) |
3c997079 | 1398 | { |
a67ba386 | 1399 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1400 | |
1401 | mutex_lock(&sessions_mutex); | |
a67ba386 | 1402 | event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype); |
3c997079 MD |
1403 | mutex_unlock(&sessions_mutex); |
1404 | return event; | |
1405 | } | |
1406 | ||
a67ba386 | 1407 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1408 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1409 | uint64_t id, uint64_t error_counter_index, |
1410 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1411 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1412 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1413 | { |
a67ba386 | 1414 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1415 | |
1416 | mutex_lock(&sessions_mutex); | |
1417 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1418 | error_counter_index, event_notifier_group, |
a67ba386 | 1419 | event_notifier_param, itype); |
dffef45d FD |
1420 | mutex_unlock(&sessions_mutex); |
1421 | return event_notifier; | |
1422 | } | |
1423 | ||
3c997079 MD |
1424 | /* Only used for tracepoints for now. */ |
1425 | static | |
a67ba386 | 1426 | void register_event(struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 1427 | { |
437d5aa5 | 1428 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1429 | int ret = -EINVAL; |
3c997079 | 1430 | |
38b35aff | 1431 | WARN_ON_ONCE(event_recorder->priv->parent.registered); |
4ecb5ad5 | 1432 | |
a67ba386 MD |
1433 | desc = event_recorder->priv->parent.desc; |
1434 | switch (event_recorder->priv->parent.instrumentation) { | |
606828e4 | 1435 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1436 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
e69abdfd | 1437 | desc->tp_class->probe_callback, |
a67ba386 | 1438 | event_recorder); |
4ecb5ad5 | 1439 | break; |
b4a75708 | 1440 | |
606828e4 | 1441 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1442 | ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1443 | break; |
b4a75708 | 1444 | |
c570be0d MJ |
1445 | case LTTNG_KERNEL_ABI_KPROBE: |
1446 | lttng_fallthrough; | |
1447 | case LTTNG_KERNEL_ABI_UPROBE: | |
1448 | lttng_fallthrough; | |
606828e4 | 1449 | case LTTNG_KERNEL_ABI_KRETPROBE: |
4ecb5ad5 MD |
1450 | ret = 0; |
1451 | break; | |
b4a75708 | 1452 | |
c570be0d MJ |
1453 | case LTTNG_KERNEL_ABI_FUNCTION: |
1454 | lttng_fallthrough; | |
1455 | case LTTNG_KERNEL_ABI_NOOP: | |
1456 | lttng_fallthrough; | |
4ecb5ad5 MD |
1457 | default: |
1458 | WARN_ON_ONCE(1); | |
1459 | } | |
3c997079 | 1460 | if (!ret) |
a67ba386 | 1461 | event_recorder->priv->parent.registered = 1; |
3c997079 MD |
1462 | } |
1463 | ||
4e3c1b9b MD |
1464 | /* |
1465 | * Only used internally at session destruction. | |
1466 | */ | |
38b35aff MD |
1467 | static |
1468 | void unregister_event(struct lttng_kernel_event_recorder *event_recorder) | |
4e3c1b9b | 1469 | { |
a67ba386 | 1470 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
437d5aa5 | 1471 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1472 | int ret = -EINVAL; |
1473 | ||
38b35aff | 1474 | WARN_ON_ONCE(!event_priv->registered); |
3c997079 | 1475 | |
a67ba386 MD |
1476 | desc = event_priv->desc; |
1477 | switch (event_priv->instrumentation) { | |
606828e4 | 1478 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1479 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
e69abdfd | 1480 | event_priv->desc->tp_class->probe_callback, |
a67ba386 | 1481 | event_recorder); |
baf20995 | 1482 | break; |
b4a75708 | 1483 | |
606828e4 | 1484 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 | 1485 | lttng_kprobes_unregister_event(event_recorder); |
d6d808f3 MD |
1486 | ret = 0; |
1487 | break; | |
b4a75708 | 1488 | |
606828e4 | 1489 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 1490 | lttng_kretprobes_unregister(event_recorder); |
7371f44c MD |
1491 | ret = 0; |
1492 | break; | |
b4a75708 | 1493 | |
606828e4 | 1494 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1495 | ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1496 | break; |
b4a75708 | 1497 | |
606828e4 | 1498 | case LTTNG_KERNEL_ABI_NOOP: |
259b6cb3 MD |
1499 | ret = 0; |
1500 | break; | |
b4a75708 | 1501 | |
606828e4 | 1502 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 1503 | lttng_uprobes_unregister_event(event_recorder); |
149b9a9d YB |
1504 | ret = 0; |
1505 | break; | |
b4a75708 | 1506 | |
c570be0d MJ |
1507 | case LTTNG_KERNEL_ABI_FUNCTION: |
1508 | lttng_fallthrough; | |
baf20995 MD |
1509 | default: |
1510 | WARN_ON_ONCE(1); | |
1511 | } | |
38b35aff | 1512 | WARN_ON_ONCE(ret); |
3c997079 | 1513 | if (!ret) |
a67ba386 | 1514 | event_priv->registered = 0; |
38b35aff MD |
1515 | } |
1516 | ||
1517 | static | |
1518 | void _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder) | |
1519 | { | |
1520 | if (event_recorder->priv->parent.registered) | |
1521 | unregister_event(event_recorder); | |
dda6a249 MD |
1522 | } |
1523 | ||
dffef45d FD |
1524 | /* Only used for tracepoints for now. */ |
1525 | static | |
a67ba386 | 1526 | void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1527 | { |
437d5aa5 | 1528 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1529 | int ret = -EINVAL; |
1530 | ||
38b35aff | 1531 | WARN_ON_ONCE(event_notifier->priv->parent.registered); |
dffef45d | 1532 | |
a67ba386 MD |
1533 | desc = event_notifier->priv->parent.desc; |
1534 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1535 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1536 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
e69abdfd | 1537 | desc->tp_class->probe_callback, |
b01155ba FD |
1538 | event_notifier); |
1539 | break; | |
b4a75708 | 1540 | |
606828e4 | 1541 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1542 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); |
1543 | break; | |
b4a75708 | 1544 | |
c570be0d MJ |
1545 | case LTTNG_KERNEL_ABI_KPROBE: |
1546 | lttng_fallthrough; | |
606828e4 | 1547 | case LTTNG_KERNEL_ABI_UPROBE: |
2b16f0c9 FD |
1548 | ret = 0; |
1549 | break; | |
b4a75708 | 1550 | |
c570be0d MJ |
1551 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1552 | lttng_fallthrough; | |
1553 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1554 | lttng_fallthrough; | |
1555 | case LTTNG_KERNEL_ABI_NOOP: | |
1556 | lttng_fallthrough; | |
dffef45d FD |
1557 | default: |
1558 | WARN_ON_ONCE(1); | |
1559 | } | |
1560 | if (!ret) | |
a67ba386 | 1561 | event_notifier->priv->parent.registered = 1; |
dffef45d FD |
1562 | } |
1563 | ||
1564 | static | |
38b35aff | 1565 | int unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1566 | { |
437d5aa5 | 1567 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1568 | int ret = -EINVAL; |
1569 | ||
38b35aff | 1570 | WARN_ON_ONCE(!event_notifier->priv->parent.registered); |
dffef45d | 1571 | |
a67ba386 MD |
1572 | desc = event_notifier->priv->parent.desc; |
1573 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1574 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1575 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname, |
e69abdfd | 1576 | event_notifier->priv->parent.desc->tp_class->probe_callback, |
b01155ba FD |
1577 | event_notifier); |
1578 | break; | |
b4a75708 | 1579 | |
606828e4 | 1580 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1581 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1582 | ret = 0; | |
1583 | break; | |
b4a75708 | 1584 | |
606828e4 | 1585 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1586 | lttng_uprobes_unregister_event_notifier(event_notifier); |
1587 | ret = 0; | |
1588 | break; | |
b4a75708 | 1589 | |
606828e4 | 1590 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1591 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); |
1592 | break; | |
b4a75708 | 1593 | |
c570be0d MJ |
1594 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1595 | lttng_fallthrough; | |
1596 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1597 | lttng_fallthrough; | |
1598 | case LTTNG_KERNEL_ABI_NOOP: | |
1599 | lttng_fallthrough; | |
dffef45d FD |
1600 | default: |
1601 | WARN_ON_ONCE(1); | |
1602 | } | |
1603 | if (!ret) | |
a67ba386 | 1604 | event_notifier->priv->parent.registered = 0; |
dffef45d FD |
1605 | return ret; |
1606 | } | |
1607 | ||
38b35aff MD |
1608 | static |
1609 | void _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier) | |
1610 | { | |
1611 | if (event_notifier->priv->parent.registered) | |
1612 | unregister_event_notifier(event_notifier); | |
1613 | } | |
1614 | ||
dda6a249 MD |
1615 | /* |
1616 | * Only used internally at session destruction. | |
1617 | */ | |
be066e6c | 1618 | static |
0648898e | 1619 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1620 | { |
0648898e | 1621 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1622 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1623 | ||
0648898e MD |
1624 | lttng_free_event_filter_runtime(event); |
1625 | /* Free event enabler refs */ | |
1626 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1627 | &event_priv->enablers_ref_head, node) | |
1628 | kfree(enabler_ref); | |
b4a75708 | 1629 | |
0648898e MD |
1630 | switch (event->type) { |
1631 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1632 | { | |
1633 | struct lttng_kernel_event_recorder *event_recorder = | |
1634 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1635 | |
0648898e MD |
1636 | switch (event_priv->instrumentation) { |
1637 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1638 | lttng_event_desc_put(event_priv->desc); | |
1639 | break; | |
b4a75708 | 1640 | |
0648898e MD |
1641 | case LTTNG_KERNEL_ABI_KPROBE: |
1642 | module_put(event_priv->desc->owner); | |
1643 | lttng_kprobes_destroy_event_private(event_recorder); | |
1644 | break; | |
b4a75708 | 1645 | |
0648898e MD |
1646 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1647 | module_put(event_priv->desc->owner); | |
1648 | lttng_kretprobes_destroy_private(event_recorder); | |
1649 | break; | |
b4a75708 | 1650 | |
0648898e MD |
1651 | case LTTNG_KERNEL_ABI_SYSCALL: |
1652 | break; | |
4e3c1b9b | 1653 | |
0648898e MD |
1654 | case LTTNG_KERNEL_ABI_UPROBE: |
1655 | module_put(event_priv->desc->owner); | |
1656 | lttng_uprobes_destroy_event_private(event_recorder); | |
1657 | break; | |
3ef5cc03 | 1658 | |
c570be0d MJ |
1659 | case LTTNG_KERNEL_ABI_FUNCTION: |
1660 | lttng_fallthrough; | |
1661 | case LTTNG_KERNEL_ABI_NOOP: | |
1662 | lttng_fallthrough; | |
0648898e MD |
1663 | default: |
1664 | WARN_ON_ONCE(1); | |
1665 | } | |
1666 | list_del(&event_recorder->priv->node); | |
1667 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1668 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1669 | break; |
0648898e MD |
1670 | } |
1671 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1672 | { | |
1673 | struct lttng_kernel_event_notifier *event_notifier = | |
1674 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1675 | |
0648898e MD |
1676 | switch (event_notifier->priv->parent.instrumentation) { |
1677 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1678 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1679 | break; | |
b4a75708 | 1680 | |
0648898e MD |
1681 | case LTTNG_KERNEL_ABI_KPROBE: |
1682 | module_put(event_notifier->priv->parent.desc->owner); | |
1683 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1684 | break; | |
b4a75708 | 1685 | |
0648898e MD |
1686 | case LTTNG_KERNEL_ABI_SYSCALL: |
1687 | break; | |
b4a75708 | 1688 | |
0648898e MD |
1689 | case LTTNG_KERNEL_ABI_UPROBE: |
1690 | module_put(event_notifier->priv->parent.desc->owner); | |
1691 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1692 | break; | |
1693 | ||
c570be0d MJ |
1694 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1695 | lttng_fallthrough; | |
1696 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1697 | lttng_fallthrough; | |
1698 | case LTTNG_KERNEL_ABI_NOOP: | |
1699 | lttng_fallthrough; | |
0648898e MD |
1700 | default: |
1701 | WARN_ON_ONCE(1); | |
1702 | } | |
1703 | list_del(&event_notifier->priv->node); | |
1704 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1705 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1706 | break; | |
1707 | } | |
dffef45d FD |
1708 | default: |
1709 | WARN_ON_ONCE(1); | |
1710 | } | |
dffef45d FD |
1711 | } |
1712 | ||
a2fa977a | 1713 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1714 | enum tracker_type tracker_type) |
e0130fab | 1715 | { |
d1f652f8 MD |
1716 | switch (tracker_type) { |
1717 | case TRACKER_PID: | |
1718 | return &session->pid_tracker; | |
1719 | case TRACKER_VPID: | |
1720 | return &session->vpid_tracker; | |
1721 | case TRACKER_UID: | |
1722 | return &session->uid_tracker; | |
1723 | case TRACKER_VUID: | |
1724 | return &session->vuid_tracker; | |
1725 | case TRACKER_GID: | |
1726 | return &session->gid_tracker; | |
1727 | case TRACKER_VGID: | |
1728 | return &session->vgid_tracker; | |
1729 | default: | |
1730 | WARN_ON_ONCE(1); | |
1731 | return NULL; | |
1732 | } | |
1733 | } | |
1734 | ||
a40e3229 | 1735 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1736 | enum tracker_type tracker_type, int id) |
1737 | { | |
a2fa977a | 1738 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1739 | int ret; |
1740 | ||
d1f652f8 MD |
1741 | tracker = get_tracker(session, tracker_type); |
1742 | if (!tracker) | |
1743 | return -EINVAL; | |
1744 | if (id < -1) | |
e0130fab MD |
1745 | return -EINVAL; |
1746 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1747 | if (id == -1) { |
1748 | /* track all ids: destroy tracker. */ | |
1749 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1750 | ret = 0; |
1751 | } else { | |
d1f652f8 | 1752 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1753 | } |
e0130fab MD |
1754 | mutex_unlock(&sessions_mutex); |
1755 | return ret; | |
1756 | } | |
1757 | ||
a40e3229 | 1758 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1759 | enum tracker_type tracker_type, int id) |
e0130fab | 1760 | { |
a2fa977a | 1761 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1762 | int ret; |
1763 | ||
d1f652f8 MD |
1764 | tracker = get_tracker(session, tracker_type); |
1765 | if (!tracker) | |
1766 | return -EINVAL; | |
1767 | if (id < -1) | |
e0130fab MD |
1768 | return -EINVAL; |
1769 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1770 | if (id == -1) { |
1771 | /* untrack all ids: replace by empty tracker. */ | |
1772 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1773 | } else { |
d1f652f8 | 1774 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1775 | } |
e0130fab MD |
1776 | mutex_unlock(&sessions_mutex); |
1777 | return ret; | |
1778 | } | |
1779 | ||
7e6f9ef6 | 1780 | static |
d1f652f8 | 1781 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1782 | { |
a2fa977a MD |
1783 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1784 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1785 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1786 | int iter = 0, i; |
1787 | ||
1788 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1789 | if (id_tracker_p) { |
1790 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1791 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1792 | |
f934e302 | 1793 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1794 | if (iter++ >= *pos) |
1795 | return e; | |
1796 | } | |
1797 | } | |
1798 | } else { | |
d1f652f8 | 1799 | /* ID tracker disabled. */ |
7e6f9ef6 | 1800 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1801 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1802 | } |
1803 | iter++; | |
1804 | } | |
1805 | /* End of list */ | |
1806 | return NULL; | |
1807 | } | |
1808 | ||
1809 | /* Called with sessions_mutex held. */ | |
1810 | static | |
d1f652f8 | 1811 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1812 | { |
a2fa977a MD |
1813 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1814 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1815 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1816 | int iter = 0, i; |
1817 | ||
1818 | (*ppos)++; | |
d1f652f8 MD |
1819 | if (id_tracker_p) { |
1820 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1821 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1822 | |
f934e302 | 1823 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1824 | if (iter++ >= *ppos) |
1825 | return e; | |
1826 | } | |
1827 | } | |
1828 | } else { | |
d1f652f8 | 1829 | /* ID tracker disabled. */ |
7e6f9ef6 | 1830 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1831 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1832 | iter++; |
1833 | } | |
1834 | ||
1835 | /* End of list */ | |
1836 | return NULL; | |
1837 | } | |
1838 | ||
1839 | static | |
d1f652f8 | 1840 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1841 | { |
1842 | mutex_unlock(&sessions_mutex); | |
1843 | } | |
1844 | ||
1845 | static | |
d1f652f8 | 1846 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1847 | { |
a2fa977a MD |
1848 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1849 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1850 | int id; |
7e6f9ef6 | 1851 | |
d1f652f8 | 1852 | if (p == id_tracker_p) { |
7e6f9ef6 | 1853 | /* Tracker disabled. */ |
d1f652f8 | 1854 | id = -1; |
7e6f9ef6 | 1855 | } else { |
d1f652f8 | 1856 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1857 | |
d1f652f8 MD |
1858 | id = lttng_id_tracker_get_node_id(e); |
1859 | } | |
a2fa977a | 1860 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1861 | case TRACKER_PID: |
1862 | seq_printf(m, "process { pid = %d; };\n", id); | |
1863 | break; | |
1864 | case TRACKER_VPID: | |
1865 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1866 | break; | |
1867 | case TRACKER_UID: | |
1868 | seq_printf(m, "user { uid = %d; };\n", id); | |
1869 | break; | |
1870 | case TRACKER_VUID: | |
1871 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1872 | break; | |
1873 | case TRACKER_GID: | |
1874 | seq_printf(m, "group { gid = %d; };\n", id); | |
1875 | break; | |
1876 | case TRACKER_VGID: | |
1877 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1878 | break; | |
1879 | default: | |
1880 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1881 | } |
7e6f9ef6 MD |
1882 | return 0; |
1883 | } | |
1884 | ||
1885 | static | |
d1f652f8 MD |
1886 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1887 | .start = id_list_start, | |
1888 | .next = id_list_next, | |
1889 | .stop = id_list_stop, | |
1890 | .show = id_list_show, | |
7e6f9ef6 MD |
1891 | }; |
1892 | ||
1893 | static | |
d1f652f8 | 1894 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1895 | { |
d1f652f8 | 1896 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1897 | } |
1898 | ||
1899 | static | |
d1f652f8 | 1900 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1901 | { |
1902 | struct seq_file *m = file->private_data; | |
a2fa977a | 1903 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1904 | int ret; |
1905 | ||
d1f652f8 | 1906 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1907 | ret = seq_release(inode, file); |
d1f652f8 | 1908 | if (!ret) |
a2fa977a | 1909 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1910 | return ret; |
1911 | } | |
1912 | ||
d1f652f8 | 1913 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1914 | .owner = THIS_MODULE, |
d1f652f8 | 1915 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1916 | .read = seq_read, |
1917 | .llseek = seq_lseek, | |
d1f652f8 | 1918 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1919 | }; |
1920 | ||
a40e3229 | 1921 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1922 | enum tracker_type tracker_type) |
7e6f9ef6 | 1923 | { |
d1f652f8 | 1924 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1925 | struct seq_file *m; |
1926 | int file_fd, ret; | |
1927 | ||
1928 | file_fd = lttng_get_unused_fd(); | |
1929 | if (file_fd < 0) { | |
1930 | ret = file_fd; | |
1931 | goto fd_error; | |
1932 | } | |
1933 | ||
d1f652f8 MD |
1934 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1935 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1936 | NULL, O_RDWR); |
d1f652f8 MD |
1937 | if (IS_ERR(tracker_ids_list_file)) { |
1938 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1939 | goto file_error; |
1940 | } | |
a40e3229 | 1941 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1942 | ret = -EOVERFLOW; |
9c1f4643 MD |
1943 | goto refcount_error; |
1944 | } | |
d1f652f8 | 1945 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1946 | if (ret < 0) |
1947 | goto open_error; | |
d1f652f8 MD |
1948 | m = tracker_ids_list_file->private_data; |
1949 | ||
1950 | m->private = get_tracker(session, tracker_type); | |
1951 | BUG_ON(!m->private); | |
1952 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1953 | |
1954 | return file_fd; | |
1955 | ||
1956 | open_error: | |
a40e3229 | 1957 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1958 | refcount_error: |
d1f652f8 | 1959 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1960 | file_error: |
1961 | put_unused_fd(file_fd); | |
1962 | fd_error: | |
1963 | return ret; | |
1964 | } | |
1965 | ||
3c997079 MD |
1966 | /* |
1967 | * Enabler management. | |
1968 | */ | |
1969 | static | |
4993071a PP |
1970 | int lttng_match_enabler_star_glob(const char *desc_name, |
1971 | const char *pattern) | |
3c997079 | 1972 | { |
cbc19040 MD |
1973 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1974 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1975 | return 0; |
1976 | return 1; | |
1977 | } | |
1978 | ||
1979 | static | |
4ecb5ad5 MD |
1980 | int lttng_match_enabler_name(const char *desc_name, |
1981 | const char *name) | |
3c997079 | 1982 | { |
4ecb5ad5 | 1983 | if (strcmp(desc_name, name)) |
3c997079 MD |
1984 | return 0; |
1985 | return 1; | |
1986 | } | |
1987 | ||
437d5aa5 | 1988 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
3c997079 MD |
1989 | struct lttng_enabler *enabler) |
1990 | { | |
4ecb5ad5 | 1991 | const char *desc_name, *enabler_name; |
badfe9f5 | 1992 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1993 | |
1994 | enabler_name = enabler->event_param.name; | |
1995 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1996 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1997 | desc_name = desc->event_name; |
3b861b22 FD |
1998 | switch (enabler->format_type) { |
1999 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2000 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2001 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2002 | return lttng_match_enabler_name(desc_name, enabler_name); |
2003 | default: | |
2004 | return -EINVAL; | |
2005 | } | |
4ecb5ad5 | 2006 | break; |
b4a75708 | 2007 | |
606828e4 | 2008 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 2009 | desc_name = desc->event_name; |
badfe9f5 | 2010 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 2011 | desc_name += strlen("compat_"); |
badfe9f5 MD |
2012 | compat = true; |
2013 | } | |
4ecb5ad5 MD |
2014 | if (!strncmp(desc_name, "syscall_exit_", |
2015 | strlen("syscall_exit_"))) { | |
2016 | desc_name += strlen("syscall_exit_"); | |
2017 | } else if (!strncmp(desc_name, "syscall_entry_", | |
2018 | strlen("syscall_entry_"))) { | |
2019 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 2020 | entry = true; |
4ecb5ad5 MD |
2021 | } else { |
2022 | WARN_ON_ONCE(1); | |
2023 | return -EINVAL; | |
2024 | } | |
badfe9f5 | 2025 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 2026 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 2027 | break; |
606828e4 | 2028 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
2029 | if (!entry) |
2030 | return 0; | |
2031 | break; | |
606828e4 | 2032 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
2033 | if (entry) |
2034 | return 0; | |
2035 | break; | |
2036 | default: | |
2037 | return -EINVAL; | |
2038 | } | |
2039 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 2040 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 2041 | break; |
606828e4 | 2042 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
2043 | if (compat) |
2044 | return 0; | |
2045 | break; | |
606828e4 | 2046 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
2047 | if (!compat) |
2048 | return 0; | |
2049 | break; | |
2050 | default: | |
2051 | return -EINVAL; | |
2052 | } | |
2053 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2054 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2055 | switch (enabler->format_type) { |
2056 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2057 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2058 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2059 | return lttng_match_enabler_name(desc_name, enabler_name); |
2060 | default: | |
2061 | return -EINVAL; | |
2062 | } | |
2063 | break; | |
606828e4 | 2064 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2065 | return -EINVAL; /* Not implemented. */ |
2066 | default: | |
2067 | return -EINVAL; | |
2068 | } | |
4ecb5ad5 | 2069 | break; |
b4a75708 | 2070 | |
4ecb5ad5 MD |
2071 | default: |
2072 | WARN_ON_ONCE(1); | |
2073 | return -EINVAL; | |
2074 | } | |
3c997079 MD |
2075 | } |
2076 | ||
2077 | static | |
b2bc0bc8 | 2078 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
a67ba386 | 2079 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2080 | { |
b2bc0bc8 FD |
2081 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
2082 | event_enabler); | |
2083 | ||
a67ba386 | 2084 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2085 | return 0; |
a67ba386 MD |
2086 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2087 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2088 | return 1; |
2089 | else | |
2090 | return 0; | |
2091 | } | |
2092 | ||
b01155ba FD |
2093 | static |
2094 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2095 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba FD |
2096 | { |
2097 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
2098 | event_notifier_enabler); | |
2099 | ||
a67ba386 | 2100 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2101 | return 0; |
a67ba386 MD |
2102 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2103 | && event_notifier->priv->group == event_notifier_enabler->group | |
2104 | && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2105 | return 1; |
2106 | else | |
2107 | return 0; | |
2108 | } | |
2109 | ||
3c997079 | 2110 | static |
b2bc0bc8 FD |
2111 | struct lttng_enabler_ref *lttng_enabler_ref( |
2112 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2113 | struct lttng_enabler *enabler) |
2114 | { | |
2115 | struct lttng_enabler_ref *enabler_ref; | |
2116 | ||
b2bc0bc8 | 2117 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2118 | if (enabler_ref->ref == enabler) |
2119 | return enabler_ref; | |
2120 | } | |
2121 | return NULL; | |
2122 | } | |
2123 | ||
3c997079 | 2124 | static |
1b917d6b | 2125 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2126 | { |
ac847066 | 2127 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; |
437d5aa5 MD |
2128 | struct lttng_kernel_probe_desc *probe_desc; |
2129 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2130 | int i; |
2131 | struct list_head *probe_list; | |
2132 | ||
2133 | probe_list = lttng_get_probe_list_head(); | |
2134 | /* | |
2135 | * For each probe event, if we find that a probe event matches | |
2136 | * our enabler, create an associated lttng_event if not | |
2137 | * already present. | |
2138 | */ | |
2139 | list_for_each_entry(probe_desc, probe_list, head) { | |
2140 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2141 | int found = 0; | |
2142 | struct hlist_head *head; | |
a67ba386 MD |
2143 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2144 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2145 | |
2146 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2147 | if (!lttng_desc_match_enabler(desc, |
2148 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2149 | continue; |
3c997079 MD |
2150 | |
2151 | /* | |
2152 | * Check if already created. | |
2153 | */ | |
4a11ef1c | 2154 | head = utils_borrow_hash_table_bucket( |
a40e3229 | 2155 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 2156 | desc->event_name); |
a67ba386 MD |
2157 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2158 | if (event_recorder_private->parent.desc == desc | |
2159 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2160 | found = 1; |
2161 | } | |
2162 | if (found) | |
2163 | continue; | |
2164 | ||
2165 | /* | |
2166 | * We need to create an event for this | |
2167 | * event probe. | |
2168 | */ | |
a67ba386 MD |
2169 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan, |
2170 | NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT); | |
2171 | if (!event_recorder) { | |
5a15f70c | 2172 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2173 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2174 | } |
2175 | } | |
2176 | } | |
2177 | } | |
2178 | ||
b01155ba FD |
2179 | static |
2180 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2181 | { | |
2182 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2183 | struct lttng_kernel_probe_desc *probe_desc; |
2184 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2185 | int i; |
2186 | struct list_head *probe_list; | |
2187 | ||
2188 | probe_list = lttng_get_probe_list_head(); | |
2189 | /* | |
2190 | * For each probe event, if we find that a probe event matches | |
2191 | * our enabler, create an associated lttng_event_notifier if not | |
2192 | * already present. | |
2193 | */ | |
2194 | list_for_each_entry(probe_desc, probe_list, head) { | |
2195 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2196 | int found = 0; | |
2197 | struct hlist_head *head; | |
a67ba386 MD |
2198 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2199 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2200 | |
2201 | desc = probe_desc->event_desc[i]; | |
2202 | if (!lttng_desc_match_enabler(desc, | |
2203 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2204 | continue; | |
2205 | ||
2206 | /* | |
2207 | * Check if already created. | |
2208 | */ | |
2209 | head = utils_borrow_hash_table_bucket( | |
2210 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2211 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2212 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2213 | if (event_notifier_priv->parent.desc == desc | |
2214 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2215 | found = 1; |
2216 | } | |
2217 | if (found) | |
2218 | continue; | |
2219 | ||
2220 | /* | |
2221 | * We need to create a event_notifier for this event probe. | |
2222 | */ | |
2223 | event_notifier = _lttng_event_notifier_create(desc, | |
2224 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2225 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2226 | event_notifier_group, NULL, |
606828e4 | 2227 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2228 | if (IS_ERR(event_notifier)) { |
2229 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2230 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2231 | } |
2232 | } | |
2233 | } | |
2234 | } | |
2235 | ||
33a39a3c | 2236 | static |
1b917d6b | 2237 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2238 | { |
2239 | int ret; | |
2240 | ||
a67ba386 | 2241 | ret = lttng_syscalls_register_event(event_enabler); |
33a39a3c MD |
2242 | WARN_ON_ONCE(ret); |
2243 | } | |
2244 | ||
8a8ac9a8 FD |
2245 | static |
2246 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2247 | { | |
2248 | int ret; | |
2249 | ||
a67ba386 | 2250 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler); |
8a8ac9a8 | 2251 | WARN_ON_ONCE(ret); |
a67ba386 | 2252 | ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler); |
8a8ac9a8 FD |
2253 | WARN_ON_ONCE(ret); |
2254 | } | |
2255 | ||
33a39a3c | 2256 | /* |
a67ba386 | 2257 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2258 | * tracepoint probes. |
2259 | * Should be called with sessions mutex held. | |
2260 | */ | |
2261 | static | |
b2bc0bc8 | 2262 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2263 | { |
b2bc0bc8 | 2264 | switch (event_enabler->base.event_param.instrumentation) { |
606828e4 | 2265 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2266 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2267 | break; |
b4a75708 | 2268 | |
606828e4 | 2269 | case LTTNG_KERNEL_ABI_SYSCALL: |
1b917d6b | 2270 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2271 | break; |
b4a75708 | 2272 | |
33a39a3c MD |
2273 | default: |
2274 | WARN_ON_ONCE(1); | |
2275 | break; | |
2276 | } | |
2277 | } | |
2278 | ||
3c997079 | 2279 | /* |
b2bc0bc8 | 2280 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2281 | * and add backward reference from the event to the enabler. |
2282 | * Should be called with sessions mutex held. | |
2283 | */ | |
2284 | static | |
b2bc0bc8 | 2285 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2286 | { |
ac847066 MD |
2287 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
2288 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; | |
b2bc0bc8 | 2289 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); |
a67ba386 | 2290 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2291 | |
606828e4 MD |
2292 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2293 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2294 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2295 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2296 | int enabled = base_enabler->enabled; |
606828e4 | 2297 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2298 | |
606828e4 | 2299 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
ac847066 | 2300 | WRITE_ONCE(chan->priv->parent.syscall_all_entry, enabled); |
3b82c4e1 | 2301 | |
606828e4 | 2302 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
ac847066 | 2303 | WRITE_ONCE(chan->priv->parent.syscall_all_exit, enabled); |
badfe9f5 MD |
2304 | } |
2305 | ||
3c997079 | 2306 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2307 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2308 | |
b2bc0bc8 | 2309 | /* For each event matching event_enabler in session event list. */ |
a40e3229 | 2310 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2311 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2312 | struct lttng_enabler_ref *enabler_ref; |
2313 | ||
a67ba386 | 2314 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2315 | continue; |
a67ba386 | 2316 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
b2bc0bc8 | 2317 | lttng_event_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2318 | if (!enabler_ref) { |
2319 | /* | |
2320 | * If no backward ref, create it. | |
b2bc0bc8 | 2321 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2322 | */ |
2323 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2324 | if (!enabler_ref) | |
2325 | return -ENOMEM; | |
b2bc0bc8 | 2326 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 | 2327 | list_add(&enabler_ref->node, |
a67ba386 | 2328 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2329 | } |
2330 | ||
f127e61e MD |
2331 | /* |
2332 | * Link filter bytecodes if not linked yet. | |
2333 | */ | |
a67ba386 | 2334 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2335 | lttng_static_ctx, |
a67ba386 | 2336 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
60206944 | 2337 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2338 | } |
2339 | return 0; | |
2340 | } | |
2341 | ||
b01155ba | 2342 | /* |
a67ba386 | 2343 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2344 | * tracepoint probes. |
2345 | * Should be called with sessions mutex held. | |
2346 | */ | |
2347 | static | |
2348 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2349 | { | |
2350 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
606828e4 | 2351 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2352 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2353 | break; | |
b4a75708 | 2354 | |
606828e4 | 2355 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
2356 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); |
2357 | break; | |
b4a75708 | 2358 | |
b01155ba FD |
2359 | default: |
2360 | WARN_ON_ONCE(1); | |
2361 | break; | |
2362 | } | |
2363 | } | |
2364 | ||
2365 | /* | |
2366 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2367 | */ | |
2368 | static | |
8a8ac9a8 FD |
2369 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2370 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2371 | { |
2372 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2373 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2374 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2375 | |
606828e4 MD |
2376 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2377 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2378 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2379 | !strcmp(base_enabler->event_param.name, "*")) { |
2380 | ||
2381 | int enabled = base_enabler->enabled; | |
606828e4 | 2382 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2383 | |
606828e4 | 2384 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2385 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); |
2386 | ||
606828e4 | 2387 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2388 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); |
2389 | ||
2390 | } | |
2391 | ||
b01155ba FD |
2392 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2393 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2394 | ||
2395 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2396 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2397 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2398 | struct lttng_enabler_ref *enabler_ref; |
2399 | ||
2400 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2401 | continue; | |
2402 | ||
a67ba386 | 2403 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2404 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2405 | if (!enabler_ref) { | |
2406 | /* | |
2407 | * If no backward ref, create it. | |
2408 | * Add backward ref from event_notifier to enabler. | |
2409 | */ | |
2410 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2411 | if (!enabler_ref) | |
2412 | return -ENOMEM; | |
2413 | ||
2414 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2415 | event_notifier_enabler); | |
2416 | list_add(&enabler_ref->node, | |
a67ba386 | 2417 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2418 | } |
2419 | ||
2420 | /* | |
2421 | * Link filter bytecodes if not linked yet. | |
2422 | */ | |
a67ba386 MD |
2423 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2424 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2425 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2426 | |
2427 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2428 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2429 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2430 | &event_notifier_enabler->capture_bytecode_head); |
2431 | ||
a67ba386 | 2432 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2433 | } |
2434 | return 0; | |
2435 | } | |
2436 | ||
3c997079 MD |
2437 | /* |
2438 | * Called at module load: connect the probe on all enablers matching | |
2439 | * this event. | |
2440 | * Called with sessions lock held. | |
2441 | */ | |
2442 | int lttng_fix_pending_events(void) | |
2443 | { | |
a40e3229 | 2444 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2445 | |
a40e3229 MD |
2446 | list_for_each_entry(session_priv, &sessions, list) |
2447 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2448 | return 0; |
2449 | } | |
2450 | ||
b01155ba FD |
2451 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2452 | struct lttng_event_notifier_group *event_notifier_group) | |
2453 | { | |
2454 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2455 | ||
2456 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2457 | node) { | |
2458 | if (event_notifier_enabler->base.enabled) | |
2459 | return true; | |
2460 | } | |
2461 | return false; | |
2462 | } | |
2463 | ||
2464 | bool lttng_event_notifier_active(void) | |
2465 | { | |
2466 | struct lttng_event_notifier_group *event_notifier_group; | |
2467 | ||
2468 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2469 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2470 | return true; | |
2471 | } | |
2472 | return false; | |
2473 | } | |
2474 | ||
2475 | int lttng_fix_pending_event_notifiers(void) | |
2476 | { | |
2477 | struct lttng_event_notifier_group *event_notifier_group; | |
2478 | ||
2479 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2480 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2481 | return 0; | |
2482 | } | |
2483 | ||
b2bc0bc8 FD |
2484 | struct lttng_event_enabler *lttng_event_enabler_create( |
2485 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2486 | struct lttng_kernel_abi_event *event_param, |
ac847066 | 2487 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2488 | { |
b2bc0bc8 | 2489 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2490 | |
b2bc0bc8 FD |
2491 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2492 | if (!event_enabler) | |
3c997079 | 2493 | return NULL; |
b2bc0bc8 FD |
2494 | event_enabler->base.format_type = format_type; |
2495 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2496 | memcpy(&event_enabler->base.event_param, event_param, | |
2497 | sizeof(event_enabler->base.event_param)); | |
2498 | event_enabler->chan = chan; | |
3c997079 | 2499 | /* ctx left NULL */ |
b2bc0bc8 | 2500 | event_enabler->base.enabled = 0; |
3c997079 | 2501 | mutex_lock(&sessions_mutex); |
ac847066 MD |
2502 | list_add(&event_enabler->node, &event_enabler->chan->parent.session->priv->enablers_head); |
2503 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); | |
3c997079 | 2504 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2505 | return event_enabler; |
3c997079 MD |
2506 | } |
2507 | ||
b2bc0bc8 | 2508 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2509 | { |
2510 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2511 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
ac847066 | 2512 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2513 | mutex_unlock(&sessions_mutex); |
2514 | return 0; | |
2515 | } | |
2516 | ||
b2bc0bc8 | 2517 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2518 | { |
2519 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2520 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
ac847066 | 2521 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2522 | mutex_unlock(&sessions_mutex); |
2523 | return 0; | |
2524 | } | |
2525 | ||
b2bc0bc8 | 2526 | static |
183e8b3a | 2527 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
606828e4 | 2528 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2529 | { |
9906b046 | 2530 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2531 | uint32_t bytecode_len; |
2532 | int ret; | |
2533 | ||
2534 | ret = get_user(bytecode_len, &bytecode->len); | |
2535 | if (ret) | |
2536 | return ret; | |
52cfcdf3 | 2537 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2538 | GFP_KERNEL); |
2539 | if (!bytecode_node) | |
2540 | return -ENOMEM; | |
2541 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2542 | sizeof(*bytecode) + bytecode_len); | |
2543 | if (ret) | |
2544 | goto error_free; | |
b2bc0bc8 | 2545 | |
8a445457 | 2546 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2547 | bytecode_node->enabler = enabler; |
2548 | /* Enforce length based on allocated size */ | |
2549 | bytecode_node->bc.len = bytecode_len; | |
2550 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2551 | |
07dfc1d0 MD |
2552 | return 0; |
2553 | ||
2554 | error_free: | |
52cfcdf3 | 2555 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2556 | return ret; |
2557 | } | |
2558 | ||
183e8b3a | 2559 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
606828e4 | 2560 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2561 | { |
2562 | int ret; | |
183e8b3a | 2563 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2564 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2565 | if (ret) | |
2566 | goto error; | |
2567 | ||
ac847066 | 2568 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
b2bc0bc8 FD |
2569 | return 0; |
2570 | ||
2571 | error: | |
2572 | return ret; | |
2573 | } | |
2574 | ||
e2d5dbc7 | 2575 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2576 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2577 | { |
2578 | ||
e2d5dbc7 | 2579 | switch (event->priv->instrumentation) { |
606828e4 | 2580 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2581 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2582 | default: |
2583 | return -EINVAL; | |
2584 | } | |
2585 | } | |
2586 | ||
3c997079 MD |
2587 | static |
2588 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2589 | { | |
9906b046 | 2590 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2591 | |
2592 | /* Destroy filter bytecode */ | |
2593 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2594 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2595 | lttng_kvfree(filter_node); |
07dfc1d0 | 2596 | } |
b2bc0bc8 FD |
2597 | } |
2598 | ||
2599 | static | |
2600 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2601 | { | |
2602 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2603 | |
b2bc0bc8 FD |
2604 | list_del(&event_enabler->node); |
2605 | kfree(event_enabler); | |
3c997079 MD |
2606 | } |
2607 | ||
dffef45d FD |
2608 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2609 | struct lttng_event_notifier_group *event_notifier_group, | |
2610 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2611 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2612 | { |
2613 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2614 | ||
2615 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2616 | if (!event_notifier_enabler) | |
2617 | return NULL; | |
2618 | ||
2619 | event_notifier_enabler->base.format_type = format_type; | |
2620 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2621 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2622 | ||
99f52fcc | 2623 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2624 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2625 | |
8a8ac9a8 FD |
2626 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2627 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2628 | |
2629 | event_notifier_enabler->base.enabled = 0; | |
2630 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2631 | event_notifier_enabler->group = event_notifier_group; | |
2632 | ||
2633 | mutex_lock(&sessions_mutex); | |
2634 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2635 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2636 | |
2637 | mutex_unlock(&sessions_mutex); | |
2638 | ||
2639 | return event_notifier_enabler; | |
2640 | } | |
2641 | ||
2642 | int lttng_event_notifier_enabler_enable( | |
2643 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2644 | { | |
2645 | mutex_lock(&sessions_mutex); | |
2646 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2647 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2648 | mutex_unlock(&sessions_mutex); |
2649 | return 0; | |
2650 | } | |
2651 | ||
2652 | int lttng_event_notifier_enabler_disable( | |
2653 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2654 | { | |
2655 | mutex_lock(&sessions_mutex); | |
2656 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2657 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2658 | mutex_unlock(&sessions_mutex); |
2659 | return 0; | |
2660 | } | |
2661 | ||
183e8b3a | 2662 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d | 2663 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
606828e4 | 2664 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
dffef45d FD |
2665 | { |
2666 | int ret; | |
2667 | ||
183e8b3a | 2668 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2669 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2670 | bytecode); | |
2671 | if (ret) | |
2672 | goto error; | |
2673 | ||
b01155ba | 2674 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2675 | return 0; |
2676 | ||
2677 | error: | |
2678 | return ret; | |
2679 | } | |
2680 | ||
99d223ad FD |
2681 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2682 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2683 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2684 | { |
9906b046 | 2685 | struct lttng_kernel_bytecode_node *bytecode_node; |
99d223ad FD |
2686 | struct lttng_enabler *enabler = |
2687 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2688 | uint32_t bytecode_len; | |
2689 | int ret; | |
2690 | ||
2691 | ret = get_user(bytecode_len, &bytecode->len); | |
2692 | if (ret) | |
2693 | return ret; | |
2694 | ||
2695 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2696 | GFP_KERNEL); | |
2697 | if (!bytecode_node) | |
2698 | return -ENOMEM; | |
2699 | ||
2700 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2701 | sizeof(*bytecode) + bytecode_len); | |
2702 | if (ret) | |
2703 | goto error_free; | |
2704 | ||
8a445457 | 2705 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2706 | bytecode_node->enabler = enabler; |
2707 | ||
2708 | /* Enforce length based on allocated size */ | |
2709 | bytecode_node->bc.len = bytecode_len; | |
2710 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2711 | ||
2712 | event_notifier_enabler->num_captures++; | |
2713 | ||
2714 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2715 | goto end; | |
2716 | ||
2717 | error_free: | |
2718 | lttng_kvfree(bytecode_node); | |
2719 | end: | |
2720 | return ret; | |
2721 | } | |
2722 | ||
dffef45d FD |
2723 | static |
2724 | void lttng_event_notifier_enabler_destroy( | |
2725 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2726 | { | |
2727 | if (!event_notifier_enabler) { | |
2728 | return; | |
2729 | } | |
2730 | ||
2731 | list_del(&event_notifier_enabler->node); | |
2732 | ||
2733 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2734 | kfree(event_notifier_enabler); | |
2735 | } | |
2736 | ||
3c997079 | 2737 | /* |
b2bc0bc8 | 2738 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2739 | * session. |
2740 | * Should be called with sessions mutex held. | |
2741 | */ | |
2742 | static | |
a40e3229 | 2743 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2744 | { |
b2bc0bc8 | 2745 | struct lttng_event_enabler *event_enabler; |
a67ba386 | 2746 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2747 | |
a40e3229 | 2748 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2749 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2750 | /* |
2751 | * For each event, if at least one of its enablers is enabled, | |
2752 | * and its channel and session transient states are enabled, we | |
2753 | * enable the event, else we disable it. | |
2754 | */ | |
a40e3229 | 2755 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2756 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2757 | struct lttng_enabler_ref *enabler_ref; |
dc7350d6 | 2758 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2759 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2760 | int nr_filters = 0; | |
3c997079 | 2761 | |
a67ba386 | 2762 | switch (event_recorder_priv->parent.instrumentation) { |
c570be0d MJ |
2763 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2764 | lttng_fallthrough; | |
606828e4 | 2765 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
2766 | /* Enable events */ |
2767 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2768 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2769 | if (enabler_ref->ref->enabled) { |
2770 | enabled = 1; | |
2771 | break; | |
2772 | } | |
2773 | } | |
4ecb5ad5 | 2774 | break; |
b4a75708 | 2775 | |
4ecb5ad5 | 2776 | default: |
3c997079 MD |
2777 | /* Not handled with lazy sync. */ |
2778 | continue; | |
2779 | } | |
2780 | /* | |
2781 | * Enabled state is based on union of enablers, with | |
2782 | * intesection of session and channel transient enable | |
2783 | * states. | |
2784 | */ | |
ac847066 | 2785 | enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; |
3c997079 | 2786 | |
a67ba386 | 2787 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2788 | /* |
2789 | * Sync tracepoint registration with event enabled | |
2790 | * state. | |
2791 | */ | |
2792 | if (enabled) { | |
38b35aff MD |
2793 | if (!event_recorder_priv->parent.registered) |
2794 | register_event(event_recorder); | |
3c997079 | 2795 | } else { |
38b35aff MD |
2796 | if (event_recorder_priv->parent.registered) |
2797 | _lttng_event_unregister(event_recorder); | |
3c997079 | 2798 | } |
07dfc1d0 MD |
2799 | |
2800 | /* Check if has enablers without bytecode enabled */ | |
2801 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2802 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2803 | if (enabler_ref->ref->enabled |
2804 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2805 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2806 | break; |
2807 | } | |
2808 | } | |
a67ba386 | 2809 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2810 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2811 | |
2812 | /* Enable filters */ | |
2813 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2814 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2815 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2816 | nr_filters++; |
2817 | } | |
2818 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2819 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2820 | } |
2821 | } | |
2822 | ||
2823 | /* | |
2824 | * Apply enablers to session events, adding events to session if need | |
2825 | * be. It is required after each modification applied to an active | |
2826 | * session, and right before session "start". | |
2827 | * "lazy" sync means we only sync if required. | |
2828 | * Should be called with sessions mutex held. | |
2829 | */ | |
2830 | static | |
a40e3229 | 2831 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2832 | { |
2833 | /* We can skip if session is not active */ | |
2834 | if (!session->active) | |
2835 | return; | |
b2bc0bc8 | 2836 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2837 | } |
2838 | ||
b01155ba FD |
2839 | static |
2840 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2841 | { | |
2842 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2843 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2844 | |
2845 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2846 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2847 | ||
2848 | /* | |
2849 | * For each event_notifier, if at least one of its enablers is enabled, | |
2850 | * we enable the event_notifier, else we disable it. | |
2851 | */ | |
a67ba386 MD |
2852 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2853 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2854 | struct lttng_enabler_ref *enabler_ref; |
dc7350d6 | 2855 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2856 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2857 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2858 | |
a67ba386 | 2859 | switch (event_notifier_priv->parent.instrumentation) { |
c570be0d MJ |
2860 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2861 | lttng_fallthrough; | |
606828e4 | 2862 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
2863 | /* Enable event_notifiers */ |
2864 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2865 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2866 | if (enabler_ref->ref->enabled) { |
2867 | enabled = 1; | |
2868 | break; | |
2869 | } | |
2870 | } | |
2871 | break; | |
b4a75708 | 2872 | |
b01155ba FD |
2873 | default: |
2874 | /* Not handled with sync. */ | |
2875 | continue; | |
2876 | } | |
2877 | ||
a67ba386 | 2878 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2879 | /* |
2880 | * Sync tracepoint registration with event_notifier enabled | |
2881 | * state. | |
2882 | */ | |
2883 | if (enabled) { | |
a67ba386 | 2884 | if (!event_notifier_priv->parent.registered) |
b01155ba FD |
2885 | register_event_notifier(event_notifier); |
2886 | } else { | |
a67ba386 | 2887 | if (event_notifier_priv->parent.registered) |
38b35aff | 2888 | unregister_event_notifier(event_notifier); |
b01155ba FD |
2889 | } |
2890 | ||
2891 | /* Check if has enablers without bytecode enabled */ | |
2892 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2893 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2894 | if (enabler_ref->ref->enabled |
2895 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2896 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2897 | break; |
2898 | } | |
2899 | } | |
a67ba386 | 2900 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2901 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2902 | |
2903 | /* Enable filters */ | |
2904 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2905 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2906 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2907 | nr_filters++; |
2908 | } | |
2909 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2910 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2911 | |
2912 | /* Enable captures */ | |
2913 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2914 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2915 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2916 | nr_captures++; |
2917 | } | |
2918 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2919 | } |
2920 | } | |
2921 | ||
1ec3f75a | 2922 | /* |
d83004aa JD |
2923 | * Serialize at most one packet worth of metadata into a metadata |
2924 | * channel. | |
92d9f5e6 MD |
2925 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2926 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2927 | * allows us to do racy operations such as looking for remaining space left in | |
2928 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2929 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2930 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2931 | * Returns the number of bytes written in the channel, 0 if no data |
2932 | * was written and a negative value on error. | |
1ec3f75a | 2933 | */ |
b3b8072b | 2934 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
4071a628 | 2935 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2936 | { |
e27e4381 | 2937 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2938 | int ret = 0; |
2939 | size_t len, reserve_len; | |
2940 | ||
f613e3e6 | 2941 | /* |
92d9f5e6 MD |
2942 | * Ensure we support mutiple get_next / put sequences followed by |
2943 | * put_next. The metadata cache lock protects reading the metadata | |
2944 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2945 | * "flush" operations on the buffer invoked by different processes. | |
2946 | * Moreover, since the metadata cache memory can be reallocated, we | |
2947 | * need to have exclusive access against updates even though we only | |
2948 | * read it. | |
f613e3e6 | 2949 | */ |
92d9f5e6 | 2950 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2951 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2952 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2953 | goto end; |
f613e3e6 | 2954 | |
9616f0bf JD |
2955 | /* Metadata regenerated, change the version. */ |
2956 | if (stream->metadata_cache->version != stream->version) | |
2957 | stream->version = stream->metadata_cache->version; | |
2958 | ||
d83004aa | 2959 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2960 | stream->metadata_in; |
9de2c215 | 2961 | if (!len) |
de23d59d | 2962 | goto end; |
d83004aa | 2963 | reserve_len = min_t(size_t, |
da1fe18f | 2964 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2965 | len); |
a775608d | 2966 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
c7d9db61 | 2967 | sizeof(char), NULL); |
d83004aa JD |
2968 | /* |
2969 | * If reservation failed, return an error to the caller. | |
2970 | */ | |
cefd899f | 2971 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2972 | if (ret != 0) { |
2973 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2974 | stream->coherent = false; |
d83004aa JD |
2975 | goto end; |
2976 | } | |
b3b8072b | 2977 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2978 | stream->metadata_cache->data + stream->metadata_in, |
77fcffef | 2979 | reserve_len, 1); |
b3b8072b | 2980 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2981 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2982 | if (reserve_len < len) |
8b97fd42 MD |
2983 | stream->coherent = false; |
2984 | else | |
2985 | stream->coherent = true; | |
d83004aa JD |
2986 | ret = reserve_len; |
2987 | ||
2988 | end: | |
8b97fd42 MD |
2989 | if (coherent) |
2990 | *coherent = stream->coherent; | |
92d9f5e6 | 2991 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2992 | return ret; |
2993 | } | |
2994 | ||
8b97fd42 | 2995 | static |
a40e3229 | 2996 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2997 | { |
a40e3229 MD |
2998 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2999 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
3000 | } |
3001 | ||
3002 | static | |
a40e3229 | 3003 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 3004 | { |
a40e3229 MD |
3005 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3006 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
3007 | struct lttng_metadata_stream *stream; |
3008 | ||
a40e3229 | 3009 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 3010 | wake_up_interruptible(&stream->read_wait); |
a40e3229 | 3011 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 3012 | } |
8b97fd42 MD |
3013 | } |
3014 | ||
d83004aa JD |
3015 | /* |
3016 | * Write the metadata to the metadata cache. | |
3017 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
3018 | * The metadata cache lock protects us from concurrent read access from |
3019 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
3020 | * The content of the printf is printed as a single atomic metadata |
3021 | * transaction. | |
d83004aa | 3022 | */ |
a40e3229 | 3023 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
3024 | const char *fmt, ...) |
3025 | { | |
c099397a | 3026 | char *str; |
d83004aa | 3027 | size_t len; |
c099397a MD |
3028 | va_list ap; |
3029 | ||
585e5dcc | 3030 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
3031 | |
3032 | va_start(ap, fmt); | |
3033 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
3034 | va_end(ap); | |
3035 | if (!str) | |
3036 | return -ENOMEM; | |
3037 | ||
1ec3f75a | 3038 | len = strlen(str); |
a40e3229 MD |
3039 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3040 | if (session->priv->metadata_cache->metadata_written + len > | |
3041 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
3042 | char *tmp_cache_realloc; |
3043 | unsigned int tmp_cache_alloc_size; | |
3044 | ||
3045 | tmp_cache_alloc_size = max_t(unsigned int, | |
a40e3229 MD |
3046 | session->priv->metadata_cache->cache_alloc + len, |
3047 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 3048 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
3049 | if (!tmp_cache_realloc) |
3050 | goto err; | |
a40e3229 | 3051 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 3052 | memcpy(tmp_cache_realloc, |
a40e3229 MD |
3053 | session->priv->metadata_cache->data, |
3054 | session->priv->metadata_cache->cache_alloc); | |
3055 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
3056 | } |
3057 | ||
a40e3229 MD |
3058 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3059 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3060 | } |
a40e3229 MD |
3061 | memcpy(session->priv->metadata_cache->data + |
3062 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3063 | str, len); |
a40e3229 | 3064 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3065 | kfree(str); |
d83004aa | 3066 | |
d83004aa JD |
3067 | return 0; |
3068 | ||
3069 | err: | |
3070 | kfree(str); | |
3071 | return -ENOMEM; | |
c099397a MD |
3072 | } |
3073 | ||
f513b2bf | 3074 | static |
a40e3229 | 3075 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3076 | { |
3077 | size_t i; | |
3078 | ||
3079 | for (i = 0; i < nesting; i++) { | |
3080 | int ret; | |
3081 | ||
3082 | ret = lttng_metadata_printf(session, " "); | |
3083 | if (ret) { | |
3084 | return ret; | |
3085 | } | |
3086 | } | |
3087 | return 0; | |
3088 | } | |
3089 | ||
ceabb767 | 3090 | static |
a40e3229 | 3091 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3092 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3093 | size_t nesting) |
3094 | { | |
3095 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3096 | } | |
3097 | ||
3098 | static | |
a40e3229 | 3099 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3100 | const struct lttng_kernel_type_integer *type, |
3101 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3102 | size_t nesting) |
3103 | { | |
3104 | int ret; | |
3105 | ||
ceabb767 MD |
3106 | ret = print_tabs(session, nesting); |
3107 | if (ret) | |
3108 | return ret; | |
3109 | ret = lttng_metadata_printf(session, | |
3110 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3111 | type->size, |
3112 | type->alignment, | |
3113 | type->signedness, | |
3114 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3115 | ? "none" |
437d5aa5 | 3116 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3117 | ? "UTF8" |
3118 | : "ASCII", | |
437d5aa5 | 3119 | type->base, |
ceabb767 | 3120 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3121 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3122 | #else |
437d5aa5 | 3123 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3124 | #endif |
3125 | ); | |
3126 | return ret; | |
3127 | } | |
3128 | ||
f513b2bf MD |
3129 | /* |
3130 | * Must be called with sessions_mutex held. | |
3131 | */ | |
3132 | static | |
a40e3229 | 3133 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3134 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3135 | size_t nesting) |
3136 | { | |
f0039724 | 3137 | const char *prev_field_name = NULL; |
f513b2bf MD |
3138 | int ret; |
3139 | uint32_t i, nr_fields; | |
ceabb767 MD |
3140 | unsigned int alignment; |
3141 | ||
f513b2bf MD |
3142 | ret = print_tabs(session, nesting); |
3143 | if (ret) | |
3144 | return ret; | |
3145 | ret = lttng_metadata_printf(session, | |
3146 | "struct {\n"); | |
3147 | if (ret) | |
3148 | return ret; | |
437d5aa5 | 3149 | nr_fields = type->nr_fields; |
f513b2bf | 3150 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3151 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3152 | |
437d5aa5 | 3153 | iter_field = type->fields[i]; |
f0039724 | 3154 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3155 | if (ret) |
3156 | return ret; | |
3157 | } | |
3158 | ret = print_tabs(session, nesting); | |
3159 | if (ret) | |
3160 | return ret; | |
437d5aa5 | 3161 | alignment = type->alignment; |
ceabb767 MD |
3162 | if (alignment) { |
3163 | ret = lttng_metadata_printf(session, | |
3164 | "} align(%u)", | |
3165 | alignment); | |
3166 | } else { | |
3167 | ret = lttng_metadata_printf(session, | |
3168 | "}"); | |
3169 | } | |
f513b2bf MD |
3170 | return ret; |
3171 | } | |
3172 | ||
3173 | /* | |
3174 | * Must be called with sessions_mutex held. | |
3175 | */ | |
3176 | static | |
a40e3229 | 3177 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3178 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3179 | size_t nesting) |
3180 | { | |
3181 | int ret; | |
3182 | ||
3183 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3184 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3185 | if (ret) |
3186 | return ret; | |
ceabb767 | 3187 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3188 | } |
3189 | ||
65c85aa6 MD |
3190 | /* |
3191 | * Must be called with sessions_mutex held. | |
3192 | */ | |
3193 | static | |
a40e3229 | 3194 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3195 | const struct lttng_kernel_type_variant *type, |
f0039724 MD |
3196 | size_t nesting, |
3197 | const char *prev_field_name) | |
65c85aa6 | 3198 | { |
f0039724 | 3199 | const char *tag_name; |
65c85aa6 MD |
3200 | int ret; |
3201 | uint32_t i, nr_choices; | |
3202 | ||
f0039724 MD |
3203 | tag_name = type->tag_name; |
3204 | if (!tag_name) | |
3205 | tag_name = prev_field_name; | |
3206 | if (!tag_name) | |
3207 | return -EINVAL; | |
ceabb767 MD |
3208 | /* |
3209 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3210 | */ | |
437d5aa5 | 3211 | if (type->alignment != 0) |
ceabb767 | 3212 | return -EINVAL; |
65c85aa6 MD |
3213 | ret = print_tabs(session, nesting); |
3214 | if (ret) | |
3215 | return ret; | |
3216 | ret = lttng_metadata_printf(session, | |
3217 | "variant <_%s> {\n", | |
f0039724 | 3218 | tag_name); |
65c85aa6 MD |
3219 | if (ret) |
3220 | return ret; | |
437d5aa5 | 3221 | nr_choices = type->nr_choices; |
65c85aa6 | 3222 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3223 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3224 | |
437d5aa5 | 3225 | iter_field = type->choices[i]; |
f0039724 | 3226 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3227 | if (ret) |
3228 | return ret; | |
3229 | } | |
3230 | ret = print_tabs(session, nesting); | |
3231 | if (ret) | |
3232 | return ret; | |
3233 | ret = lttng_metadata_printf(session, | |
3234 | "}"); | |
3235 | return ret; | |
3236 | } | |
3237 | ||
3238 | /* | |
3239 | * Must be called with sessions_mutex held. | |
3240 | */ | |
3241 | static | |
a40e3229 | 3242 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3243 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3244 | size_t nesting, |
3245 | const char *prev_field_name) | |
65c85aa6 MD |
3246 | { |
3247 | int ret; | |
3248 | ||
3249 | ret = _lttng_variant_type_statedump(session, | |
f0039724 MD |
3250 | lttng_kernel_get_type_variant(field->type), nesting, |
3251 | prev_field_name); | |
65c85aa6 MD |
3252 | if (ret) |
3253 | return ret; | |
ceabb767 | 3254 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3255 | } |
3256 | ||
f513b2bf MD |
3257 | /* |
3258 | * Must be called with sessions_mutex held. | |
3259 | */ | |
3260 | static | |
a40e3229 | 3261 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3262 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3263 | size_t nesting) |
3264 | { | |
3265 | int ret; | |
437d5aa5 MD |
3266 | const struct lttng_kernel_type_array *array_type; |
3267 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3268 | |
437d5aa5 MD |
3269 | array_type = lttng_kernel_get_type_array(field->type); |
3270 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3271 | |
437d5aa5 | 3272 | if (array_type->alignment) { |
ceabb767 | 3273 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3274 | if (ret) |
3275 | return ret; | |
ceabb767 MD |
3276 | ret = lttng_metadata_printf(session, |
3277 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3278 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3279 | field->name); |
3280 | if (ret) | |
3281 | return ret; | |
3282 | } | |
3283 | /* | |
3284 | * Nested compound types: Only array of structures and variants are | |
3285 | * currently supported. | |
3286 | */ | |
437d5aa5 | 3287 | elem_type = array_type->elem_type; |
12bb2edb MD |
3288 | switch (elem_type->type) { |
3289 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3290 | case lttng_kernel_type_struct: |
3291 | case lttng_kernel_type_variant: | |
3292 | ret = _lttng_type_statedump(session, elem_type, | |
3293 | array_type->encoding, nesting); | |
65c85aa6 MD |
3294 | if (ret) |
3295 | return ret; | |
3296 | break; | |
ceabb767 | 3297 | |
f513b2bf MD |
3298 | default: |
3299 | return -EINVAL; | |
3300 | } | |
3301 | ret = lttng_metadata_printf(session, | |
3302 | " _%s[%u];\n", | |
3303 | field->name, | |
437d5aa5 | 3304 | array_type->length); |
f513b2bf MD |
3305 | return ret; |
3306 | } | |
3307 | ||
3308 | /* | |
3309 | * Must be called with sessions_mutex held. | |
3310 | */ | |
3311 | static | |
a40e3229 | 3312 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3313 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3314 | size_t nesting, |
3315 | const char *prev_field_name) | |
f513b2bf MD |
3316 | { |
3317 | int ret; | |
3318 | const char *length_name; | |
437d5aa5 MD |
3319 | const struct lttng_kernel_type_sequence *sequence_type; |
3320 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3321 | |
437d5aa5 MD |
3322 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3323 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3324 | |
437d5aa5 | 3325 | length_name = sequence_type->length_name; |
f0039724 MD |
3326 | if (!length_name) |
3327 | length_name = prev_field_name; | |
3328 | if (!length_name) | |
3329 | return -EINVAL; | |
ceabb767 | 3330 | |
437d5aa5 | 3331 | if (sequence_type->alignment) { |
ceabb767 | 3332 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3333 | if (ret) |
3334 | return ret; | |
ceabb767 MD |
3335 | ret = lttng_metadata_printf(session, |
3336 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3337 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3338 | field->name); |
3339 | if (ret) | |
3340 | return ret; | |
3341 | } | |
3342 | ||
3343 | /* | |
3344 | * Nested compound types: Only array of structures and variants are | |
3345 | * currently supported. | |
3346 | */ | |
437d5aa5 | 3347 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3348 | switch (elem_type->type) { |
3349 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3350 | case lttng_kernel_type_struct: |
3351 | case lttng_kernel_type_variant: | |
3352 | ret = _lttng_type_statedump(session, elem_type, | |
3353 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3354 | if (ret) |
3355 | return ret; | |
3356 | break; | |
ceabb767 | 3357 | |
f513b2bf MD |
3358 | default: |
3359 | return -EINVAL; | |
3360 | } | |
3361 | ret = lttng_metadata_printf(session, | |
3362 | " _%s[ _%s ];\n", | |
3363 | field->name, | |
f0039724 | 3364 | length_name); |
f513b2bf MD |
3365 | return ret; |
3366 | } | |
3367 | ||
141ddf28 MD |
3368 | /* |
3369 | * Must be called with sessions_mutex held. | |
3370 | */ | |
3371 | static | |
a40e3229 | 3372 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3373 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3374 | size_t nesting) |
3375 | { | |
d96a4a7a | 3376 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3377 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3378 | int ret; |
3379 | unsigned int i, nr_entries; | |
3380 | ||
437d5aa5 | 3381 | container_type = type->container_type; |
12bb2edb | 3382 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3383 | ret = -EINVAL; |
3384 | goto end; | |
3385 | } | |
437d5aa5 | 3386 | enum_desc = type->desc; |
141ddf28 MD |
3387 | nr_entries = enum_desc->nr_entries; |
3388 | ||
3389 | ret = print_tabs(session, nesting); | |
3390 | if (ret) | |
3391 | goto end; | |
ceabb767 MD |
3392 | ret = lttng_metadata_printf(session, "enum : "); |
3393 | if (ret) | |
3394 | goto end; | |
437d5aa5 MD |
3395 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3396 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3397 | if (ret) |
ceabb767 MD |
3398 | goto end; |
3399 | ret = lttng_metadata_printf(session, " {\n"); | |
3400 | if (ret) | |
3401 | goto end; | |
141ddf28 MD |
3402 | /* Dump all entries */ |
3403 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3404 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3405 | int j, len; |
3406 | ||
3407 | ret = print_tabs(session, nesting + 1); | |
3408 | if (ret) | |
3409 | goto end; | |
3410 | ret = lttng_metadata_printf(session, | |
3411 | "\""); | |
3412 | if (ret) | |
3413 | goto end; | |
3414 | len = strlen(entry->string); | |
3415 | /* Escape the character '"' */ | |
3416 | for (j = 0; j < len; j++) { | |
3417 | char c = entry->string[j]; | |
3418 | ||
3419 | switch (c) { | |
3420 | case '"': | |
3421 | ret = lttng_metadata_printf(session, | |
3422 | "\\\""); | |
3423 | break; | |
3424 | case '\\': | |
3425 | ret = lttng_metadata_printf(session, | |
3426 | "\\\\"); | |
3427 | break; | |
3428 | default: | |
3429 | ret = lttng_metadata_printf(session, | |
3430 | "%c", c); | |
3431 | break; | |
3432 | } | |
3433 | if (ret) | |
3434 | goto end; | |
3435 | } | |
08ad1061 PP |
3436 | ret = lttng_metadata_printf(session, "\""); |
3437 | if (ret) | |
3438 | goto end; | |
3439 | ||
3440 | if (entry->options.is_auto) { | |
3441 | ret = lttng_metadata_printf(session, ",\n"); | |
3442 | if (ret) | |
3443 | goto end; | |
141ddf28 | 3444 | } else { |
7c559490 MD |
3445 | ret = lttng_metadata_printf(session, |
3446 | " = "); | |
3447 | if (ret) | |
3448 | goto end; | |
3449 | if (entry->start.signedness) | |
141ddf28 | 3450 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3451 | "%lld", (long long) entry->start.value); |
3452 | else | |
3453 | ret = lttng_metadata_printf(session, | |
3454 | "%llu", entry->start.value); | |
3455 | if (ret) | |
3456 | goto end; | |
3457 | if (entry->start.signedness == entry->end.signedness && | |
3458 | entry->start.value | |
3459 | == entry->end.value) { | |
141ddf28 | 3460 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3461 | ",\n"); |
3462 | } else { | |
3463 | if (entry->end.signedness) { | |
3464 | ret = lttng_metadata_printf(session, | |
3465 | " ... %lld,\n", | |
3466 | (long long) entry->end.value); | |
3467 | } else { | |
3468 | ret = lttng_metadata_printf(session, | |
3469 | " ... %llu,\n", | |
3470 | entry->end.value); | |
3471 | } | |
141ddf28 | 3472 | } |
7c559490 MD |
3473 | if (ret) |
3474 | goto end; | |
141ddf28 | 3475 | } |
141ddf28 MD |
3476 | } |
3477 | ret = print_tabs(session, nesting); | |
3478 | if (ret) | |
3479 | goto end; | |
ceabb767 | 3480 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3481 | end: |
3482 | return ret; | |
3483 | } | |
3484 | ||
d83004aa JD |
3485 | /* |
3486 | * Must be called with sessions_mutex held. | |
3487 | */ | |
c099397a | 3488 | static |
a40e3229 | 3489 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3490 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3491 | size_t nesting) |
3492 | { | |
3493 | int ret; | |
437d5aa5 | 3494 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3495 | |
437d5aa5 MD |
3496 | enum_type = lttng_kernel_get_type_enum(field->type); |
3497 | WARN_ON_ONCE(!enum_type); | |
3498 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3499 | if (ret) |
3500 | return ret; | |
3501 | return lttng_field_name_statedump(session, field, nesting); | |
3502 | } | |
3503 | ||
3504 | static | |
a40e3229 | 3505 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3506 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3507 | size_t nesting) |
3508 | { | |
3509 | int ret; | |
3510 | ||
437d5aa5 MD |
3511 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3512 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3513 | if (ret) |
3514 | return ret; | |
3515 | return lttng_field_name_statedump(session, field, nesting); | |
3516 | } | |
3517 | ||
3518 | static | |
a40e3229 | 3519 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3520 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3521 | size_t nesting) |
3522 | { | |
3523 | int ret; | |
3524 | ||
ceabb767 MD |
3525 | /* Default encoding is UTF8 */ |
3526 | ret = print_tabs(session, nesting); | |
3527 | if (ret) | |
3528 | return ret; | |
3529 | ret = lttng_metadata_printf(session, | |
3530 | "string%s", | |
437d5aa5 | 3531 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3532 | " { encoding = ASCII; }" : ""); |
3533 | return ret; | |
3534 | } | |
3535 | ||
3536 | static | |
a40e3229 | 3537 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3538 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3539 | size_t nesting) |
ceabb767 | 3540 | { |
437d5aa5 | 3541 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3542 | int ret; |
3543 | ||
437d5aa5 MD |
3544 | string_type = lttng_kernel_get_type_string(field->type); |
3545 | WARN_ON_ONCE(!string_type); | |
3546 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3547 | if (ret) |
3548 | return ret; | |
3549 | return lttng_field_name_statedump(session, field, nesting); | |
3550 | } | |
3551 | ||
3552 | /* | |
3553 | * Must be called with sessions_mutex held. | |
3554 | */ | |
3555 | static | |
a40e3229 | 3556 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3557 | const struct lttng_kernel_type_common *type, |
3558 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3559 | size_t nesting) |
c099397a | 3560 | { |
c099397a | 3561 | int ret = 0; |
c099397a | 3562 | |
12bb2edb MD |
3563 | switch (type->type) { |
3564 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3565 | ret = _lttng_integer_type_statedump(session, |
3566 | lttng_kernel_get_type_integer(type), | |
3567 | parent_encoding, nesting); | |
8070f5c0 | 3568 | break; |
437d5aa5 MD |
3569 | case lttng_kernel_type_enum: |
3570 | ret = _lttng_enum_type_statedump(session, | |
3571 | lttng_kernel_get_type_enum(type), | |
3572 | nesting); | |
8070f5c0 | 3573 | break; |
12bb2edb | 3574 | case lttng_kernel_type_string: |
437d5aa5 MD |
3575 | ret = _lttng_string_type_statedump(session, |
3576 | lttng_kernel_get_type_string(type), | |
3577 | nesting); | |
ceabb767 | 3578 | break; |
437d5aa5 MD |
3579 | case lttng_kernel_type_struct: |
3580 | ret = _lttng_struct_type_statedump(session, | |
3581 | lttng_kernel_get_type_struct(type), | |
3582 | nesting); | |
8070f5c0 | 3583 | break; |
437d5aa5 MD |
3584 | case lttng_kernel_type_variant: |
3585 | ret = _lttng_variant_type_statedump(session, | |
3586 | lttng_kernel_get_type_variant(type), | |
f0039724 | 3587 | nesting, NULL); |
ceabb767 MD |
3588 | break; |
3589 | ||
3590 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3591 | case lttng_kernel_type_array: |
3592 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3593 | default: |
3594 | WARN_ON_ONCE(1); | |
3595 | return -EINVAL; | |
8070f5c0 | 3596 | } |
ceabb767 MD |
3597 | return ret; |
3598 | } | |
8070f5c0 | 3599 | |
ceabb767 MD |
3600 | /* |
3601 | * Must be called with sessions_mutex held. | |
3602 | */ | |
3603 | static | |
a40e3229 | 3604 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3605 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3606 | size_t nesting, |
3607 | const char **prev_field_name_p) | |
ceabb767 | 3608 | { |
f0039724 | 3609 | const char *prev_field_name = NULL; |
ceabb767 | 3610 | int ret = 0; |
27d2368e | 3611 | |
f0039724 MD |
3612 | if (prev_field_name_p) |
3613 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3614 | switch (field->type->type) { |
12bb2edb | 3615 | case lttng_kernel_type_integer: |
ceabb767 MD |
3616 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3617 | break; | |
437d5aa5 | 3618 | case lttng_kernel_type_enum: |
ceabb767 | 3619 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3620 | break; |
12bb2edb | 3621 | case lttng_kernel_type_string: |
ceabb767 | 3622 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3623 | break; |
437d5aa5 | 3624 | case lttng_kernel_type_struct: |
ceabb767 | 3625 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3626 | break; |
437d5aa5 | 3627 | case lttng_kernel_type_array: |
ceabb767 | 3628 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3629 | break; |
437d5aa5 | 3630 | case lttng_kernel_type_sequence: |
f0039724 | 3631 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3632 | break; |
437d5aa5 | 3633 | case lttng_kernel_type_variant: |
f0039724 | 3634 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3635 | break; |
f513b2bf | 3636 | |
8070f5c0 MD |
3637 | default: |
3638 | WARN_ON_ONCE(1); | |
3639 | return -EINVAL; | |
3640 | } | |
f0039724 MD |
3641 | if (prev_field_name_p) |
3642 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3643 | return ret; |
3644 | } | |
3645 | ||
3646 | static | |
a40e3229 | 3647 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3648 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3649 | { |
f0039724 | 3650 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3651 | int ret = 0; |
3652 | int i; | |
3653 | ||
3654 | if (!ctx) | |
3655 | return 0; | |
3656 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3657 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3658 | |
f0039724 | 3659 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3660 | if (ret) |
3661 | return ret; | |
3662 | } | |
3663 | return ret; | |
3664 | } | |
3665 | ||
3666 | static | |
a40e3229 | 3667 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3668 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3669 | { |
f0039724 | 3670 | const char *prev_field_name = NULL; |
a67ba386 | 3671 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3672 | int ret = 0; |
3673 | int i; | |
3674 | ||
e69abdfd MD |
3675 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3676 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3677 | |
f0039724 | 3678 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3679 | if (ret) |
3680 | return ret; | |
c099397a MD |
3681 | } |
3682 | return ret; | |
3683 | } | |
3684 | ||
d83004aa JD |
3685 | /* |
3686 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3687 | * The entire event metadata is printed as a single atomic metadata |
3688 | * transaction. | |
d83004aa | 3689 | */ |
c099397a | 3690 | static |
a40e3229 | 3691 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 3692 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3693 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3694 | { |
3695 | int ret = 0; | |
3696 | ||
a67ba386 | 3697 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3698 | return 0; |
ac847066 | 3699 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3700 | return 0; |
3701 | ||
8b97fd42 MD |
3702 | lttng_metadata_begin(session); |
3703 | ||
c099397a MD |
3704 | ret = lttng_metadata_printf(session, |
3705 | "event {\n" | |
ae734547 | 3706 | " name = \"%s\";\n" |
c099397a | 3707 | " id = %u;\n" |
b9074a1b | 3708 | " stream_id = %u;\n", |
a67ba386 MD |
3709 | event_recorder->priv->parent.desc->event_name, |
3710 | event_recorder->priv->id, | |
ac847066 | 3711 | event_recorder->chan->priv->id); |
c099397a MD |
3712 | if (ret) |
3713 | goto end; | |
3714 | ||
8070f5c0 | 3715 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3716 | " fields := struct {\n" |
3717 | ); | |
3718 | if (ret) | |
3719 | goto end; | |
3720 | ||
a67ba386 | 3721 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3722 | if (ret) |
3723 | goto end; | |
3724 | ||
3725 | /* | |
3726 | * LTTng space reservation can only reserve multiples of the | |
3727 | * byte size. | |
3728 | */ | |
3729 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3730 | " };\n" |
3731 | "};\n\n"); | |
c099397a MD |
3732 | if (ret) |
3733 | goto end; | |
3734 | ||
a67ba386 | 3735 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3736 | end: |
8b97fd42 | 3737 | lttng_metadata_end(session); |
c099397a MD |
3738 | return ret; |
3739 | ||
3740 | } | |
3741 | ||
d83004aa JD |
3742 | /* |
3743 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3744 | * The entire channel metadata is printed as a single atomic metadata |
3745 | * transaction. | |
d83004aa | 3746 | */ |
c099397a | 3747 | static |
a40e3229 | 3748 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 3749 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3750 | { |
3751 | int ret = 0; | |
3752 | ||
ac847066 | 3753 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3754 | return 0; |
d83004aa | 3755 | |
ac847066 | 3756 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3757 | return 0; |
3758 | ||
8b97fd42 MD |
3759 | lttng_metadata_begin(session); |
3760 | ||
ac847066 | 3761 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3762 | ret = lttng_metadata_printf(session, |
3763 | "stream {\n" | |
3764 | " id = %u;\n" | |
9115fbdc | 3765 | " event.header := %s;\n" |
b9074a1b | 3766 | " packet.context := struct packet_context;\n", |
ac847066 MD |
3767 | chan->priv->id, |
3768 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3769 | "struct event_header_large"); |
3770 | if (ret) | |
3771 | goto end; | |
3772 | ||
ac847066 | 3773 | if (chan->priv->ctx) { |
b9074a1b MD |
3774 | ret = lttng_metadata_printf(session, |
3775 | " event.context := struct {\n"); | |
3776 | if (ret) | |
3777 | goto end; | |
3778 | } | |
ac847066 | 3779 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3780 | if (ret) |
3781 | goto end; | |
ac847066 | 3782 | if (chan->priv->ctx) { |
b9074a1b MD |
3783 | ret = lttng_metadata_printf(session, |
3784 | " };\n"); | |
3785 | if (ret) | |
3786 | goto end; | |
3787 | } | |
8070f5c0 MD |
3788 | |
3789 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3790 | "};\n\n"); |
8070f5c0 | 3791 | |
ac847066 | 3792 | chan->priv->metadata_dumped = 1; |
c099397a | 3793 | end: |
8b97fd42 | 3794 | lttng_metadata_end(session); |
c099397a MD |
3795 | return ret; |
3796 | } | |
3797 | ||
d83004aa JD |
3798 | /* |
3799 | * Must be called with sessions_mutex held. | |
3800 | */ | |
9115fbdc | 3801 | static |
a40e3229 | 3802 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3803 | { |
3804 | return lttng_metadata_printf(session, | |
3805 | "struct packet_context {\n" | |
a3ccff4f MD |
3806 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3807 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3808 | " uint64_t content_size;\n" |
3809 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3810 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3811 | " unsigned long events_discarded;\n" |
9115fbdc | 3812 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3813 | "};\n\n" |
9115fbdc MD |
3814 | ); |
3815 | } | |
3816 | ||
3817 | /* | |
3818 | * Compact header: | |
3819 | * id: range: 0 - 30. | |
3820 | * id 31 is reserved to indicate an extended header. | |
3821 | * | |
3822 | * Large header: | |
3823 | * id: range: 0 - 65534. | |
3824 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3825 | * |
3826 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3827 | */ |
3828 | static | |
a40e3229 | 3829 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3830 | { |
3831 | return lttng_metadata_printf(session, | |
3832 | "struct event_header_compact {\n" | |
3833 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3834 | " variant <id> {\n" | |
3835 | " struct {\n" | |
a3ccff4f | 3836 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3837 | " } compact;\n" |
3838 | " struct {\n" | |
3839 | " uint32_t id;\n" | |
a3ccff4f | 3840 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3841 | " } extended;\n" |
3842 | " } v;\n" | |
3843 | "} align(%u);\n" | |
3844 | "\n" | |
3845 | "struct event_header_large {\n" | |
3846 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3847 | " variant <id> {\n" | |
3848 | " struct {\n" | |
a3ccff4f | 3849 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3850 | " } compact;\n" |
3851 | " struct {\n" | |
3852 | " uint32_t id;\n" | |
a3ccff4f | 3853 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3854 | " } extended;\n" |
3855 | " } v;\n" | |
3856 | "} align(%u);\n\n", | |
a90917c3 MD |
3857 | lttng_alignof(uint32_t) * CHAR_BIT, |
3858 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3859 | ); |
3860 | } | |
3861 | ||
a3ccff4f MD |
3862 | /* |
3863 | * Approximation of NTP time of day to clock monotonic correlation, | |
3864 | * taken at start of trace. | |
3865 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3866 | * in future versions. | |
5283350b MD |
3867 | * This function may return a negative offset. It may happen if the |
3868 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3869 | * |
3870 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3871 | * y2038 compliant. | |
a3ccff4f MD |
3872 | */ |
3873 | static | |
8967b2a3 | 3874 | int64_t measure_clock_offset(void) |
a3ccff4f | 3875 | { |
dcb93448 | 3876 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3877 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3878 | int64_t offset; |
a3ccff4f | 3879 | unsigned long flags; |
3636085f MJ |
3880 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3881 | struct timespec64 rts = { 0, 0 }; | |
3882 | #else | |
3883 | struct timespec rts = { 0, 0 }; | |
3884 | #endif | |
a3ccff4f MD |
3885 | |
3886 | /* Disable interrupts to increase correlation precision. */ | |
3887 | local_irq_save(flags); | |
3888 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3889 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3890 | ktime_get_real_ts64(&rts); | |
3891 | #else | |
216b6baa | 3892 | getnstimeofday(&rts); |
3636085f | 3893 | #endif |
a3ccff4f MD |
3894 | monotonic[1] = trace_clock_read64(); |
3895 | local_irq_restore(flags); | |
3896 | ||
dcb93448 | 3897 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3898 | realtime = (uint64_t) rts.tv_sec * tcf; |
3899 | if (tcf == NSEC_PER_SEC) { | |
3900 | realtime += rts.tv_nsec; | |
3901 | } else { | |
3902 | uint64_t n = rts.tv_nsec * tcf; | |
3903 | ||
3904 | do_div(n, NSEC_PER_SEC); | |
3905 | realtime += n; | |
3906 | } | |
dcb93448 | 3907 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3908 | return offset; |
3909 | } | |
3910 | ||
3eb95be4 | 3911 | static |
a40e3229 | 3912 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3913 | { |
0f3eaad4 | 3914 | int ret = 0; |
3eb95be4 JR |
3915 | size_t i; |
3916 | char cur; | |
3917 | ||
3918 | i = 0; | |
3919 | cur = string[i]; | |
3920 | while (cur != '\0') { | |
3921 | switch (cur) { | |
3922 | case '\n': | |
3923 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3924 | break; | |
3925 | case '\\': | |
3926 | case '"': | |
3927 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3928 | if (ret) | |
3929 | goto error; | |
3930 | /* We still print the current char */ | |
c570be0d | 3931 | lttng_fallthrough; |
3eb95be4 JR |
3932 | default: |
3933 | ret = lttng_metadata_printf(session, "%c", cur); | |
3934 | break; | |
3935 | } | |
3936 | ||
3937 | if (ret) | |
3938 | goto error; | |
3939 | ||
3940 | cur = string[++i]; | |
3941 | } | |
3942 | error: | |
3943 | return ret; | |
3944 | } | |
3945 | ||
3946 | static | |
a40e3229 | 3947 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3948 | const char *field_value) |
3eb95be4 JR |
3949 | { |
3950 | int ret; | |
3951 | ||
1c88f269 | 3952 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3953 | if (ret) |
3954 | goto error; | |
3955 | ||
1c88f269 | 3956 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3957 | if (ret) |
3958 | goto error; | |
3959 | ||
3960 | ret = lttng_metadata_printf(session, "\";\n"); | |
3961 | ||
3962 | error: | |
3963 | return ret; | |
3964 | } | |
3965 | ||
c099397a MD |
3966 | /* |
3967 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3968 | * Must be called with sessions_mutex held. |
c099397a MD |
3969 | */ |
3970 | static | |
a40e3229 | 3971 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3972 | { |
a40e3229 | 3973 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3974 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3975 | const char *product_uuid; |
ac847066 | 3976 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3977 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3978 | int ret = 0; |
3979 | ||
585e5dcc | 3980 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3981 | return 0; |
8b97fd42 MD |
3982 | |
3983 | lttng_metadata_begin(session); | |
3984 | ||
a40e3229 | 3985 | if (session->priv->metadata_dumped) |
c099397a | 3986 | goto skip_session; |
c099397a | 3987 | |
d793d5e1 | 3988 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3989 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3990 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3991 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3992 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3993 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3994 | |
3995 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3996 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3997 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3998 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3999 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 4000 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
4001 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
4002 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
4003 | "\n" |
4004 | "trace {\n" | |
4005 | " major = %u;\n" | |
4006 | " minor = %u;\n" | |
30bdb6e4 | 4007 | " uuid = \"%s\";\n" |
d793d5e1 MD |
4008 | " byte_order = %s;\n" |
4009 | " packet.header := struct {\n" | |
4010 | " uint32_t magic;\n" | |
1ec3f75a | 4011 | " uint8_t uuid[16];\n" |
d793d5e1 | 4012 | " uint32_t stream_id;\n" |
5594698f | 4013 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 4014 | " };\n" |
d793d5e1 | 4015 | "};\n\n", |
a90917c3 MD |
4016 | lttng_alignof(uint8_t) * CHAR_BIT, |
4017 | lttng_alignof(uint16_t) * CHAR_BIT, | |
4018 | lttng_alignof(uint32_t) * CHAR_BIT, | |
4019 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
4020 | sizeof(unsigned long) * CHAR_BIT, |
4021 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
4022 | CTF_SPEC_MAJOR, |
4023 | CTF_SPEC_MINOR, | |
d793d5e1 | 4024 | uuid_s, |
5214fa50 | 4025 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
4026 | "be" |
4027 | #else | |
4028 | "le" | |
4029 | #endif | |
4030 | ); | |
4031 | if (ret) | |
4032 | goto end; | |
4033 | ||
99dc9597 MD |
4034 | ret = lttng_metadata_printf(session, |
4035 | "env {\n" | |
a6058143 | 4036 | " hostname = \"%s\";\n" |
c6c9e10f | 4037 | " domain = \"kernel\";\n" |
99dc9597 | 4038 | " sysname = \"%s\";\n" |
c6c9e10f MD |
4039 | " kernel_release = \"%s\";\n" |
4040 | " kernel_version = \"%s\";\n" | |
4041 | " tracer_name = \"lttng-modules\";\n" | |
4042 | " tracer_major = %d;\n" | |
4043 | " tracer_minor = %d;\n" | |
4044 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 4045 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 4046 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
4047 | utsname()->sysname, |
4048 | utsname()->release, | |
c6c9e10f MD |
4049 | utsname()->version, |
4050 | LTTNG_MODULES_MAJOR_VERSION, | |
4051 | LTTNG_MODULES_MINOR_VERSION, | |
4052 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
4053 | ); |
4054 | if (ret) | |
4055 | goto end; | |
4056 | ||
a40e3229 | 4057 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
4058 | if (ret) |
4059 | goto end; | |
4060 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
a40e3229 | 4061 | session->priv->creation_time); |
3eb95be4 JR |
4062 | if (ret) |
4063 | goto end; | |
4064 | ||
c88f762e GB |
4065 | /* Add the product UUID to the 'env' section */ |
4066 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4067 | if (product_uuid) { | |
4068 | ret = lttng_metadata_printf(session, | |
4069 | " product_uuid = \"%s\";\n", | |
4070 | product_uuid | |
4071 | ); | |
4072 | if (ret) | |
4073 | goto end; | |
4074 | } | |
4075 | ||
4076 | /* Close the 'env' section */ | |
3eb95be4 JR |
4077 | ret = lttng_metadata_printf(session, "};\n\n"); |
4078 | if (ret) | |
4079 | goto end; | |
4080 | ||
a3ccff4f MD |
4081 | ret = lttng_metadata_printf(session, |
4082 | "clock {\n" | |
2754583e MD |
4083 | " name = \"%s\";\n", |
4084 | trace_clock_name() | |
a82c63f1 MD |
4085 | ); |
4086 | if (ret) | |
4087 | goto end; | |
4088 | ||
4089 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4090 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4091 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4092 | clock_uuid_s |
4093 | ); | |
4094 | if (ret) | |
4095 | goto end; | |
4096 | } | |
4097 | ||
4098 | ret = lttng_metadata_printf(session, | |
2754583e | 4099 | " description = \"%s\";\n" |
a3ccff4f MD |
4100 | " freq = %llu; /* Frequency, in Hz */\n" |
4101 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4102 | " offset = %lld;\n" |
a3ccff4f | 4103 | "};\n\n", |
2754583e | 4104 | trace_clock_description(), |
a3ccff4f | 4105 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4106 | (long long) measure_clock_offset() |
a3ccff4f MD |
4107 | ); |
4108 | if (ret) | |
4109 | goto end; | |
4110 | ||
4111 | ret = lttng_metadata_printf(session, | |
4112 | "typealias integer {\n" | |
4113 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4114 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4115 | "} := uint27_clock_monotonic_t;\n" |
4116 | "\n" | |
4117 | "typealias integer {\n" | |
4118 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4119 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4120 | "} := uint32_clock_monotonic_t;\n" |
4121 | "\n" | |
4122 | "typealias integer {\n" | |
4123 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4124 | " map = clock.%s.value;\n" |
a3ccff4f | 4125 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4126 | trace_clock_name(), |
a3ccff4f | 4127 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4128 | trace_clock_name(), |
4129 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4130 | trace_clock_name() | |
a3ccff4f MD |
4131 | ); |
4132 | if (ret) | |
4133 | goto end; | |
4134 | ||
a90917c3 | 4135 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4136 | if (ret) |
4137 | goto end; | |
4138 | ||
a90917c3 | 4139 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4140 | if (ret) |
4141 | goto end; | |
4142 | ||
c099397a | 4143 | skip_session: |
ac847066 MD |
4144 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4145 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4146 | if (ret) |
4147 | goto end; | |
4148 | } | |
4149 | ||
a40e3229 | 4150 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4151 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4152 | event_recorder_priv->pub); | |
c099397a MD |
4153 | if (ret) |
4154 | goto end; | |
4155 | } | |
a40e3229 | 4156 | session->priv->metadata_dumped = 1; |
c099397a | 4157 | end: |
8b97fd42 | 4158 | lttng_metadata_end(session); |
c099397a MD |
4159 | return ret; |
4160 | } | |
4161 | ||
c0e31d2e | 4162 | /** |
a90917c3 | 4163 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4164 | * @transport: transport structure |
4165 | * | |
4166 | * Registers a transport which can be used as output to extract the data out of | |
4167 | * LTTng. The module calling this registration function must ensure that no | |
4168 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4169 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4170 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4171 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4172 | * after its registration must it synchronize the TLBs. |
4173 | */ | |
a90917c3 | 4174 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4175 | { |
4176 | /* | |
4177 | * Make sure no page fault can be triggered by the module about to be | |
4178 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4179 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4180 | */ |
263b6c88 | 4181 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4182 | |
4183 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4184 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4185 | mutex_unlock(&sessions_mutex); |
4186 | } | |
a90917c3 | 4187 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4188 | |
4189 | /** | |
a90917c3 | 4190 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4191 | * @transport: transport structure |
4192 | */ | |
a90917c3 | 4193 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4194 | { |
4195 | mutex_lock(&sessions_mutex); | |
4196 | list_del(&transport->node); | |
4197 | mutex_unlock(&sessions_mutex); | |
4198 | } | |
a90917c3 | 4199 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4200 | |
a101fa10 MD |
4201 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4202 | { | |
4203 | /* | |
4204 | * Make sure no page fault can be triggered by the module about to be | |
4205 | * registered. We deal with this here so we don't have to call | |
4206 | * vmalloc_sync_mappings() in each module's init. | |
4207 | */ | |
4208 | wrapper_vmalloc_sync_mappings(); | |
4209 | ||
4210 | mutex_lock(&sessions_mutex); | |
4211 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4212 | mutex_unlock(&sessions_mutex); | |
4213 | } | |
4214 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4215 | ||
4216 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4217 | { | |
4218 | mutex_lock(&sessions_mutex); | |
4219 | list_del(&transport->node); | |
4220 | mutex_unlock(&sessions_mutex); | |
4221 | } | |
4222 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4223 | ||
5f4c791e | 4224 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4225 | |
4226 | enum cpuhp_state lttng_hp_prepare; | |
4227 | enum cpuhp_state lttng_hp_online; | |
4228 | ||
4229 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4230 | { | |
4231 | struct lttng_cpuhp_node *lttng_node; | |
4232 | ||
4233 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4234 | switch (lttng_node->component) { | |
4235 | case LTTNG_RING_BUFFER_FRONTEND: | |
4236 | return 0; | |
4237 | case LTTNG_RING_BUFFER_BACKEND: | |
4238 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4239 | case LTTNG_RING_BUFFER_ITER: | |
4240 | return 0; | |
4241 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4242 | return 0; | |
4243 | default: | |
4244 | return -EINVAL; | |
4245 | } | |
4246 | } | |
4247 | ||
4248 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4249 | { | |
4250 | struct lttng_cpuhp_node *lttng_node; | |
4251 | ||
4252 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4253 | switch (lttng_node->component) { | |
4254 | case LTTNG_RING_BUFFER_FRONTEND: | |
4255 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4256 | case LTTNG_RING_BUFFER_BACKEND: | |
4257 | return 0; | |
4258 | case LTTNG_RING_BUFFER_ITER: | |
4259 | return 0; | |
4260 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4261 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4262 | default: | |
4263 | return -EINVAL; | |
4264 | } | |
4265 | } | |
4266 | ||
4267 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4268 | { | |
4269 | struct lttng_cpuhp_node *lttng_node; | |
4270 | ||
4271 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4272 | switch (lttng_node->component) { | |
4273 | case LTTNG_RING_BUFFER_FRONTEND: | |
4274 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4275 | case LTTNG_RING_BUFFER_BACKEND: | |
4276 | return 0; | |
4277 | case LTTNG_RING_BUFFER_ITER: | |
4278 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4279 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4280 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4281 | default: | |
4282 | return -EINVAL; | |
4283 | } | |
4284 | } | |
4285 | ||
4286 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4287 | { | |
4288 | struct lttng_cpuhp_node *lttng_node; | |
4289 | ||
4290 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4291 | switch (lttng_node->component) { | |
4292 | case LTTNG_RING_BUFFER_FRONTEND: | |
4293 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4294 | case LTTNG_RING_BUFFER_BACKEND: | |
4295 | return 0; | |
4296 | case LTTNG_RING_BUFFER_ITER: | |
4297 | return 0; | |
4298 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4299 | return 0; | |
4300 | default: | |
4301 | return -EINVAL; | |
4302 | } | |
4303 | } | |
4304 | ||
4305 | static int __init lttng_init_cpu_hotplug(void) | |
4306 | { | |
4307 | int ret; | |
4308 | ||
4309 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4310 | lttng_hotplug_prepare, | |
4311 | lttng_hotplug_dead); | |
4312 | if (ret < 0) { | |
4313 | return ret; | |
4314 | } | |
4315 | lttng_hp_prepare = ret; | |
4316 | lttng_rb_set_hp_prepare(ret); | |
4317 | ||
4318 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4319 | lttng_hotplug_online, | |
4320 | lttng_hotplug_offline); | |
4321 | if (ret < 0) { | |
4322 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4323 | lttng_hp_prepare = 0; | |
4324 | return ret; | |
4325 | } | |
4326 | lttng_hp_online = ret; | |
4327 | lttng_rb_set_hp_online(ret); | |
4328 | ||
4329 | return 0; | |
4330 | } | |
4331 | ||
4332 | static void __exit lttng_exit_cpu_hotplug(void) | |
4333 | { | |
4334 | lttng_rb_set_hp_online(0); | |
4335 | cpuhp_remove_multi_state(lttng_hp_online); | |
4336 | lttng_rb_set_hp_prepare(0); | |
4337 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4338 | } | |
4339 | ||
5f4c791e | 4340 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4341 | static int lttng_init_cpu_hotplug(void) |
4342 | { | |
4343 | return 0; | |
4344 | } | |
4345 | static void lttng_exit_cpu_hotplug(void) | |
4346 | { | |
4347 | } | |
5f4c791e | 4348 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4349 | |
a90917c3 | 4350 | static int __init lttng_events_init(void) |
4e3c1b9b | 4351 | { |
1c25284c MD |
4352 | int ret; |
4353 | ||
453b2495 JD |
4354 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4355 | if (ret) | |
4356 | return ret; | |
389d7070 | 4357 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4358 | if (ret) |
4359 | return ret; | |
4360 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4361 | if (ret) |
4362 | return ret; | |
4363 | ret = lttng_probes_init(); | |
389d7070 MD |
4364 | if (ret) |
4365 | return ret; | |
07dfc1d0 | 4366 | ret = lttng_context_init(); |
20591cf7 MD |
4367 | if (ret) |
4368 | return ret; | |
07dfc1d0 MD |
4369 | ret = lttng_tracepoint_init(); |
4370 | if (ret) | |
4371 | goto error_tp; | |
a67ba386 MD |
4372 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4373 | if (!event_recorder_cache) { | |
20591cf7 | 4374 | ret = -ENOMEM; |
a67ba386 | 4375 | goto error_kmem_event_recorder; |
dffef45d | 4376 | } |
a67ba386 MD |
4377 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4378 | if (!event_recorder_private_cache) { | |
4379 | ret = -ENOMEM; | |
4380 | goto error_kmem_event_recorder_private; | |
4381 | } | |
4382 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4383 | if (!event_notifier_cache) { |
4384 | ret = -ENOMEM; | |
4385 | goto error_kmem_event_notifier; | |
20591cf7 | 4386 | } |
a67ba386 MD |
4387 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4388 | if (!event_notifier_private_cache) { | |
4389 | ret = -ENOMEM; | |
4390 | goto error_kmem_event_notifier_private; | |
4391 | } | |
80996790 | 4392 | ret = lttng_abi_init(); |
02119ee5 MD |
4393 | if (ret) |
4394 | goto error_abi; | |
0c956676 MD |
4395 | ret = lttng_logger_init(); |
4396 | if (ret) | |
4397 | goto error_logger; | |
1e367326 MD |
4398 | ret = lttng_init_cpu_hotplug(); |
4399 | if (ret) | |
4400 | goto error_hotplug; | |
101215b7 | 4401 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4402 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4403 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4404 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4405 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4406 | LTTNG_VERSION_NAME, |
4407 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4408 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4409 | #else | |
4410 | "", | |
4411 | #endif | |
4412 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4413 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4414 | #else | |
4415 | ""); | |
4416 | #endif | |
f73c5a43 MJ |
4417 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4418 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4419 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4420 | return 0; |
0c956676 | 4421 | |
1e367326 MD |
4422 | error_hotplug: |
4423 | lttng_logger_exit(); | |
0c956676 MD |
4424 | error_logger: |
4425 | lttng_abi_exit(); | |
02119ee5 | 4426 | error_abi: |
a67ba386 MD |
4427 | kmem_cache_destroy(event_notifier_private_cache); |
4428 | error_kmem_event_notifier_private: | |
dffef45d FD |
4429 | kmem_cache_destroy(event_notifier_cache); |
4430 | error_kmem_event_notifier: | |
a67ba386 MD |
4431 | kmem_cache_destroy(event_recorder_private_cache); |
4432 | error_kmem_event_recorder_private: | |
4433 | kmem_cache_destroy(event_recorder_cache); | |
4434 | error_kmem_event_recorder: | |
20591cf7 | 4435 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4436 | error_tp: |
4437 | lttng_context_exit(); | |
101215b7 | 4438 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4439 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4440 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4441 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4442 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4443 | LTTNG_VERSION_NAME, |
4444 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4445 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4446 | #else | |
4447 | "", | |
4448 | #endif | |
4449 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4450 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4451 | #else | |
4452 | ""); | |
4453 | #endif | |
1c25284c | 4454 | return ret; |
4e3c1b9b MD |
4455 | } |
4456 | ||
a90917c3 | 4457 | module_init(lttng_events_init); |
11b5a3c2 | 4458 | |
a90917c3 | 4459 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4460 | { |
a40e3229 | 4461 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4462 | |
1e367326 | 4463 | lttng_exit_cpu_hotplug(); |
0c956676 | 4464 | lttng_logger_exit(); |
80996790 | 4465 | lttng_abi_exit(); |
a40e3229 MD |
4466 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4467 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4468 | kmem_cache_destroy(event_recorder_cache); |
4469 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4470 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4471 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4472 | lttng_tracepoint_exit(); |
07dfc1d0 | 4473 | lttng_context_exit(); |
101215b7 | 4474 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4475 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4476 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4477 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4478 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4479 | LTTNG_VERSION_NAME, |
4480 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4481 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4482 | #else | |
4483 | "", | |
4484 | #endif | |
4485 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4486 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4487 | #else | |
4488 | ""); | |
4489 | #endif | |
4e3c1b9b | 4490 | } |
92e94819 | 4491 | |
a90917c3 | 4492 | module_exit(lttng_events_exit); |
11b5a3c2 | 4493 | |
7ca11e77 | 4494 | #include <generated/patches.h> |
101215b7 MJ |
4495 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4496 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4497 | #endif | |
4498 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4499 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4500 | #endif | |
92e94819 MD |
4501 | MODULE_LICENSE("GPL and additional rights"); |
4502 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4503 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4504 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4505 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4506 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4507 | LTTNG_MODULES_EXTRAVERSION); |