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 | |
c190d76e | 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 | |
8cdc1a81 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); | |
dffef45d | 69 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 70 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 71 | |
0648898e | 72 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
f7d06400 | 73 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
a67ba386 MD |
74 | static int _lttng_event_unregister(struct lttng_kernel_event_recorder *event); |
75 | static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier); | |
c099397a | 76 | static |
8cdc1a81 | 77 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 78 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 79 | struct lttng_kernel_event_recorder *event); |
c099397a | 80 | static |
8cdc1a81 | 81 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
82 | static |
83 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 84 | static |
8cdc1a81 | 85 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
86 | const struct lttng_kernel_type_common *type, |
87 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
88 | size_t nesting); |
89 | static | |
8cdc1a81 | 90 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 91 | const struct lttng_kernel_event_field *field, |
51ef4536 | 92 | size_t nesting, const char **prev_field_name_p); |
c099397a | 93 | |
c099397a | 94 | void synchronize_trace(void) |
abcca994 | 95 | { |
05355f0b MJ |
96 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
97 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
98 | synchronize_rcu(); |
99 | #else | |
abcca994 | 100 | synchronize_sched(); |
92da05ce MJ |
101 | #endif |
102 | ||
5f4c791e | 103 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
104 | #ifdef CONFIG_PREEMPT_RT_FULL |
105 | synchronize_rcu(); | |
106 | #endif | |
5f4c791e | 107 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
108 | #ifdef CONFIG_PREEMPT_RT |
109 | synchronize_rcu(); | |
110 | #endif | |
5f4c791e | 111 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
112 | } |
113 | ||
3c997079 MD |
114 | void lttng_lock_sessions(void) |
115 | { | |
116 | mutex_lock(&sessions_mutex); | |
117 | } | |
118 | ||
119 | void lttng_unlock_sessions(void) | |
120 | { | |
121 | mutex_unlock(&sessions_mutex); | |
122 | } | |
123 | ||
9fe593d2 FD |
124 | static struct lttng_transport *lttng_transport_find(const char *name) |
125 | { | |
126 | struct lttng_transport *transport; | |
127 | ||
128 | list_for_each_entry(transport, <tng_transport_list, node) { | |
129 | if (!strcmp(transport->name, name)) | |
130 | return transport; | |
131 | } | |
132 | return NULL; | |
133 | } | |
134 | ||
3c997079 MD |
135 | /* |
136 | * Called with sessions lock held. | |
137 | */ | |
138 | int lttng_session_active(void) | |
139 | { | |
8cdc1a81 | 140 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
141 | |
142 | list_for_each_entry(iter, &sessions, list) { | |
8cdc1a81 | 143 | if (iter->pub->active) |
3c997079 MD |
144 | return 1; |
145 | } | |
146 | return 0; | |
147 | } | |
148 | ||
8cdc1a81 | 149 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 150 | { |
8cdc1a81 MD |
151 | struct lttng_kernel_session *session; |
152 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 153 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 154 | int i; |
4e3c1b9b MD |
155 | |
156 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 157 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 158 | if (!session) |
d83004aa | 159 | goto err; |
8cdc1a81 MD |
160 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
161 | if (!session_priv) | |
162 | goto err_free_session; | |
163 | session->priv = session_priv; | |
164 | session_priv->pub = session; | |
165 | ||
166 | INIT_LIST_HEAD(&session_priv->chan); | |
167 | INIT_LIST_HEAD(&session_priv->events); | |
168 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
169 | |
170 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
171 | GFP_KERNEL); | |
172 | if (!metadata_cache) | |
8cdc1a81 | 173 | goto err_free_session_private; |
0ca42eb7 | 174 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
175 | if (!metadata_cache->data) |
176 | goto err_free_cache; | |
177 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
178 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 179 | mutex_init(&metadata_cache->lock); |
8cdc1a81 | 180 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 181 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
8cdc1a81 | 182 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 183 | sizeof(metadata_cache->uuid)); |
8cdc1a81 | 184 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 185 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
8cdc1a81 MD |
186 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
187 | list_add(&session_priv->list, &sessions); | |
188 | ||
8c0393c3 MD |
189 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
190 | goto tracker_alloc_error; | |
191 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
192 | goto tracker_alloc_error; | |
193 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
194 | goto tracker_alloc_error; | |
195 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
196 | goto tracker_alloc_error; | |
197 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
198 | goto tracker_alloc_error; | |
199 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
200 | goto tracker_alloc_error; | |
201 | ||
4e3c1b9b | 202 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 203 | |
4e3c1b9b | 204 | return session; |
d83004aa | 205 | |
8c0393c3 MD |
206 | tracker_alloc_error: |
207 | lttng_id_tracker_fini(&session->pid_tracker); | |
208 | lttng_id_tracker_fini(&session->vpid_tracker); | |
209 | lttng_id_tracker_fini(&session->uid_tracker); | |
210 | lttng_id_tracker_fini(&session->vuid_tracker); | |
211 | lttng_id_tracker_fini(&session->gid_tracker); | |
212 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
213 | err_free_cache: |
214 | kfree(metadata_cache); | |
8cdc1a81 MD |
215 | err_free_session_private: |
216 | lttng_kvfree(session_priv); | |
d83004aa | 217 | err_free_session: |
48f5e0b5 | 218 | lttng_kvfree(session); |
d83004aa JD |
219 | err: |
220 | mutex_unlock(&sessions_mutex); | |
221 | return NULL; | |
222 | } | |
223 | ||
99f52fcc FD |
224 | static |
225 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
226 | { | |
227 | struct lttng_counter_transport *transport; | |
228 | ||
229 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
230 | if (!strcmp(transport->name, name)) | |
231 | return transport; | |
232 | } | |
233 | return NULL; | |
234 | } | |
235 | ||
236 | struct lttng_counter *lttng_kernel_counter_create( | |
237 | const char *counter_transport_name, | |
238 | size_t number_dimensions, const size_t *dimensions_sizes) | |
239 | { | |
240 | struct lttng_counter *counter = NULL; | |
241 | struct lttng_counter_transport *counter_transport = NULL; | |
242 | ||
243 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
244 | if (!counter_transport) { | |
245 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
246 | counter_transport_name); | |
247 | goto notransport; | |
248 | } | |
249 | if (!try_module_get(counter_transport->owner)) { | |
250 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
251 | goto notransport; | |
252 | } | |
253 | ||
254 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
255 | if (!counter) | |
256 | goto nomem; | |
257 | ||
258 | /* Create event notifier error counter. */ | |
259 | counter->ops = &counter_transport->ops; | |
260 | counter->transport = counter_transport; | |
261 | ||
262 | counter->counter = counter->ops->counter_create( | |
263 | number_dimensions, dimensions_sizes, 0); | |
264 | if (!counter->counter) { | |
265 | goto create_error; | |
266 | } | |
267 | ||
268 | return counter; | |
269 | ||
270 | create_error: | |
271 | lttng_kvfree(counter); | |
272 | nomem: | |
273 | if (counter_transport) | |
274 | module_put(counter_transport->owner); | |
275 | notransport: | |
276 | return NULL; | |
277 | } | |
278 | ||
750b05f2 FD |
279 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
280 | { | |
281 | struct lttng_transport *transport = NULL; | |
282 | struct lttng_event_notifier_group *event_notifier_group; | |
283 | const char *transport_name = "relay-event-notifier"; | |
284 | size_t subbuf_size = 4096; //TODO | |
285 | size_t num_subbuf = 16; //TODO | |
286 | unsigned int switch_timer_interval = 0; | |
287 | unsigned int read_timer_interval = 0; | |
dffef45d | 288 | int i; |
750b05f2 FD |
289 | |
290 | mutex_lock(&sessions_mutex); | |
291 | ||
292 | transport = lttng_transport_find(transport_name); | |
293 | if (!transport) { | |
294 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
295 | transport_name); | |
296 | goto notransport; | |
297 | } | |
298 | if (!try_module_get(transport->owner)) { | |
299 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
300 | transport_name); | |
301 | goto notransport; | |
302 | } | |
303 | ||
304 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
305 | GFP_KERNEL); | |
306 | if (!event_notifier_group) | |
307 | goto nomem; | |
308 | ||
309 | /* | |
310 | * Initialize the ring buffer used to store event notifier | |
311 | * notifications. | |
312 | */ | |
313 | event_notifier_group->ops = &transport->ops; | |
4a399b76 | 314 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
315 | transport_name, event_notifier_group, NULL, |
316 | subbuf_size, num_subbuf, switch_timer_interval, | |
317 | read_timer_interval); | |
318 | if (!event_notifier_group->chan) | |
319 | goto create_error; | |
320 | ||
321 | event_notifier_group->transport = transport; | |
dffef45d FD |
322 | |
323 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
324 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
325 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
326 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
327 | ||
750b05f2 FD |
328 | list_add(&event_notifier_group->node, &event_notifier_groups); |
329 | ||
330 | mutex_unlock(&sessions_mutex); | |
331 | ||
332 | return event_notifier_group; | |
333 | ||
334 | create_error: | |
335 | lttng_kvfree(event_notifier_group); | |
336 | nomem: | |
337 | if (transport) | |
338 | module_put(transport->owner); | |
339 | notransport: | |
340 | mutex_unlock(&sessions_mutex); | |
341 | return NULL; | |
342 | } | |
343 | ||
d83004aa JD |
344 | void metadata_cache_destroy(struct kref *kref) |
345 | { | |
346 | struct lttng_metadata_cache *cache = | |
347 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 348 | vfree(cache->data); |
d83004aa | 349 | kfree(cache); |
4e3c1b9b MD |
350 | } |
351 | ||
8cdc1a81 | 352 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 353 | { |
f7d06400 | 354 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 355 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 356 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 357 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 358 | int ret; |
4e3c1b9b MD |
359 | |
360 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 361 | WRITE_ONCE(session->active, 0); |
f7d06400 MD |
362 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
363 | ret = lttng_syscalls_unregister_channel(chan_priv->pub); | |
1ec65de1 MD |
364 | WARN_ON(ret); |
365 | } | |
8cdc1a81 | 366 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 367 | ret = _lttng_event_unregister(event_recorder_priv->pub); |
dda6a249 MD |
368 | WARN_ON(ret); |
369 | } | |
abcca994 | 370 | synchronize_trace(); /* Wait for in-flight events to complete */ |
f7d06400 MD |
371 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
372 | ret = lttng_syscalls_destroy_event(chan_priv->pub); | |
badfe9f5 MD |
373 | WARN_ON(ret); |
374 | } | |
b2bc0bc8 | 375 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
8cdc1a81 | 376 | &session->priv->enablers_head, node) |
b2bc0bc8 | 377 | lttng_event_enabler_destroy(event_enabler); |
8cdc1a81 | 378 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node) |
0648898e | 379 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
f7d06400 MD |
380 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
381 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
382 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 383 | } |
8cdc1a81 MD |
384 | mutex_lock(&session->priv->metadata_cache->lock); |
385 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 386 | _lttng_metadata_channel_hangup(metadata_stream); |
8cdc1a81 | 387 | mutex_unlock(&session->priv->metadata_cache->lock); |
8c0393c3 MD |
388 | lttng_id_tracker_fini(&session->pid_tracker); |
389 | lttng_id_tracker_fini(&session->vpid_tracker); | |
390 | lttng_id_tracker_fini(&session->uid_tracker); | |
391 | lttng_id_tracker_fini(&session->vuid_tracker); | |
392 | lttng_id_tracker_fini(&session->gid_tracker); | |
393 | lttng_id_tracker_fini(&session->vgid_tracker); | |
8cdc1a81 MD |
394 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
395 | list_del(&session->priv->list); | |
4e3c1b9b | 396 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 397 | lttng_kvfree(session->priv); |
48f5e0b5 | 398 | lttng_kvfree(session); |
4e3c1b9b MD |
399 | } |
400 | ||
dffef45d FD |
401 | void lttng_event_notifier_group_destroy( |
402 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 403 | { |
dffef45d | 404 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
a67ba386 | 405 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
406 | int ret; |
407 | ||
750b05f2 FD |
408 | if (!event_notifier_group) |
409 | return; | |
410 | ||
411 | mutex_lock(&sessions_mutex); | |
dffef45d | 412 | |
3b82c4e1 | 413 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
414 | WARN_ON(ret); |
415 | ||
a67ba386 MD |
416 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
417 | &event_notifier_group->event_notifiers_head, node) { | |
418 | ret = _lttng_event_notifier_unregister(event_notifier_priv->pub); | |
dffef45d FD |
419 | WARN_ON(ret); |
420 | } | |
421 | ||
b01155ba FD |
422 | /* Wait for in-flight event notifier to complete */ |
423 | synchronize_trace(); | |
424 | ||
21f58fb7 FD |
425 | irq_work_sync(&event_notifier_group->wakeup_pending); |
426 | ||
8a8ac9a8 FD |
427 | kfree(event_notifier_group->sc_filter); |
428 | ||
dffef45d FD |
429 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
430 | &event_notifier_group->enablers_head, node) | |
431 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
432 | ||
a67ba386 MD |
433 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
434 | &event_notifier_group->event_notifiers_head, node) | |
0648898e | 435 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 436 | |
99f52fcc FD |
437 | if (event_notifier_group->error_counter) { |
438 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 439 | |
99f52fcc FD |
440 | error_counter->ops->counter_destroy(error_counter->counter); |
441 | module_put(error_counter->transport->owner); | |
442 | lttng_kvfree(error_counter); | |
443 | event_notifier_group->error_counter = NULL; | |
444 | } | |
445 | ||
4a399b76 | 446 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
447 | module_put(event_notifier_group->transport->owner); |
448 | list_del(&event_notifier_group->node); | |
dffef45d | 449 | |
750b05f2 FD |
450 | mutex_unlock(&sessions_mutex); |
451 | lttng_kvfree(event_notifier_group); | |
452 | } | |
453 | ||
8cdc1a81 | 454 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
455 | { |
456 | int ret; | |
457 | ||
458 | mutex_lock(&sessions_mutex); | |
459 | ret = lttng_statedump_start(session); | |
460 | mutex_unlock(&sessions_mutex); | |
461 | return ret; | |
462 | } | |
463 | ||
8cdc1a81 | 464 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
465 | { |
466 | int ret = 0; | |
f7d06400 | 467 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
468 | |
469 | mutex_lock(&sessions_mutex); | |
470 | if (session->active) { | |
471 | ret = -EBUSY; | |
472 | goto end; | |
473 | } | |
c099397a | 474 | |
3c997079 | 475 | /* Set transient enabler state to "enabled" */ |
8cdc1a81 | 476 | session->priv->tstate = 1; |
3c997079 | 477 | |
4ef81e4a | 478 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 479 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 480 | |
c099397a MD |
481 | /* |
482 | * Snapshot the number of events per channel to know the type of header | |
483 | * we need to use. | |
484 | */ | |
f7d06400 MD |
485 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
486 | if (chan_priv->header_type) | |
487 | continue; /* don't change it if session stop/restart */ | |
488 | if (chan_priv->free_event_id < 31) | |
489 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 490 | else |
f7d06400 | 491 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
492 | } |
493 | ||
64af2437 | 494 | /* Clear each stream's quiescent state. */ |
f7d06400 MD |
495 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
496 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
497 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 498 | } |
64af2437 | 499 | |
a8f2d0c7 | 500 | WRITE_ONCE(session->active, 1); |
8cdc1a81 | 501 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 502 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 503 | if (ret) { |
a8f2d0c7 | 504 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
505 | goto end; |
506 | } | |
507 | ret = lttng_statedump_start(session); | |
360f38ea | 508 | if (ret) |
a8f2d0c7 | 509 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
510 | end: |
511 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 512 | return ret; |
c0e31d2e MD |
513 | } |
514 | ||
8cdc1a81 | 515 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
516 | { |
517 | int ret = 0; | |
f7d06400 | 518 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
519 | |
520 | mutex_lock(&sessions_mutex); | |
521 | if (!session->active) { | |
522 | ret = -EBUSY; | |
523 | goto end; | |
524 | } | |
a8f2d0c7 | 525 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
526 | |
527 | /* Set transient enabler state to "disabled" */ | |
8cdc1a81 | 528 | session->priv->tstate = 0; |
b2bc0bc8 | 529 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
530 | |
531 | /* Set each stream's quiescent state. */ | |
f7d06400 MD |
532 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
533 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
534 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 535 | } |
c0e31d2e MD |
536 | end: |
537 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 538 | return ret; |
c0e31d2e MD |
539 | } |
540 | ||
8cdc1a81 | 541 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
542 | { |
543 | int ret = 0; | |
f7d06400 | 544 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 545 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
8cdc1a81 | 546 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
547 | struct lttng_metadata_stream *stream; |
548 | ||
549 | mutex_lock(&sessions_mutex); | |
550 | if (!session->active) { | |
551 | ret = -EBUSY; | |
552 | goto end; | |
553 | } | |
554 | ||
555 | mutex_lock(&cache->lock); | |
556 | memset(cache->data, 0, cache->cache_alloc); | |
557 | cache->metadata_written = 0; | |
558 | cache->version++; | |
8cdc1a81 | 559 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
560 | stream->metadata_out = 0; |
561 | stream->metadata_in = 0; | |
562 | } | |
563 | mutex_unlock(&cache->lock); | |
564 | ||
8cdc1a81 | 565 | session->priv->metadata_dumped = 0; |
f7d06400 MD |
566 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
567 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
568 | } |
569 | ||
8cdc1a81 | 570 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 571 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
572 | } |
573 | ||
574 | ret = _lttng_session_metadata_statedump(session); | |
575 | ||
576 | end: | |
577 | mutex_unlock(&sessions_mutex); | |
578 | return ret; | |
579 | } | |
580 | ||
f7d06400 | 581 | int lttng_channel_enable(struct lttng_kernel_channel_buffer *channel) |
e64957da | 582 | { |
3c997079 | 583 | int ret = 0; |
e64957da | 584 | |
3c997079 | 585 | mutex_lock(&sessions_mutex); |
f7d06400 | 586 | if (channel->priv->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
587 | ret = -EPERM; |
588 | goto end; | |
589 | } | |
f7d06400 | 590 | if (channel->parent.enabled) { |
3c997079 MD |
591 | ret = -EEXIST; |
592 | goto end; | |
593 | } | |
594 | /* Set transient enabler state to "enabled" */ | |
f7d06400 MD |
595 | channel->priv->parent.tstate = 1; |
596 | lttng_session_sync_event_enablers(channel->parent.session); | |
3c997079 | 597 | /* Set atomically the state to "enabled" */ |
f7d06400 | 598 | WRITE_ONCE(channel->parent.enabled, 1); |
3c997079 MD |
599 | end: |
600 | mutex_unlock(&sessions_mutex); | |
601 | return ret; | |
e64957da MD |
602 | } |
603 | ||
f7d06400 | 604 | int lttng_channel_disable(struct lttng_kernel_channel_buffer *channel) |
e64957da | 605 | { |
3c997079 | 606 | int ret = 0; |
e64957da | 607 | |
3c997079 | 608 | mutex_lock(&sessions_mutex); |
f7d06400 | 609 | if (channel->priv->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
610 | ret = -EPERM; |
611 | goto end; | |
612 | } | |
f7d06400 | 613 | if (!channel->parent.enabled) { |
3c997079 MD |
614 | ret = -EEXIST; |
615 | goto end; | |
616 | } | |
617 | /* Set atomically the state to "disabled" */ | |
f7d06400 | 618 | WRITE_ONCE(channel->parent.enabled, 0); |
3c997079 | 619 | /* Set transient enabler state to "enabled" */ |
f7d06400 MD |
620 | channel->priv->parent.tstate = 0; |
621 | lttng_session_sync_event_enablers(channel->parent.session); | |
3c997079 MD |
622 | end: |
623 | mutex_unlock(&sessions_mutex); | |
624 | return ret; | |
e64957da MD |
625 | } |
626 | ||
9d993668 | 627 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 628 | { |
3c997079 | 629 | int ret = 0; |
e64957da | 630 | |
3c997079 | 631 | mutex_lock(&sessions_mutex); |
9d993668 MD |
632 | switch (event->type) { |
633 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
634 | { | |
635 | struct lttng_kernel_event_recorder *event_recorder = | |
636 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
637 | ||
f7d06400 | 638 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
639 | ret = -EPERM; |
640 | goto end; | |
641 | } | |
a0493bef | 642 | break; |
9d993668 MD |
643 | } |
644 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
645 | switch (event->priv->instrumentation) { | |
646 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
647 | ret = -EINVAL; | |
648 | goto end; | |
649 | default: | |
650 | break; | |
651 | } | |
a0493bef MD |
652 | break; |
653 | default: | |
9d993668 | 654 | break; |
a0493bef | 655 | } |
e64957da | 656 | |
9d993668 | 657 | if (event->enabled) { |
3c997079 MD |
658 | ret = -EEXIST; |
659 | goto end; | |
660 | } | |
a67ba386 | 661 | switch (event->priv->instrumentation) { |
c190d76e MJ |
662 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
663 | lttng_fallthrough; | |
606828e4 | 664 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
665 | ret = -EINVAL; |
666 | break; | |
b4a75708 | 667 | |
c190d76e MJ |
668 | case LTTNG_KERNEL_ABI_KPROBE: |
669 | lttng_fallthrough; | |
606828e4 | 670 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 671 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 672 | break; |
b4a75708 | 673 | |
606828e4 | 674 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 675 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 676 | break; |
b4a75708 | 677 | |
c190d76e MJ |
678 | case LTTNG_KERNEL_ABI_FUNCTION: |
679 | lttng_fallthrough; | |
680 | case LTTNG_KERNEL_ABI_NOOP: | |
681 | lttng_fallthrough; | |
a0493bef MD |
682 | default: |
683 | WARN_ON_ONCE(1); | |
684 | ret = -EINVAL; | |
685 | } | |
3c997079 MD |
686 | end: |
687 | mutex_unlock(&sessions_mutex); | |
688 | return ret; | |
e64957da MD |
689 | } |
690 | ||
9d993668 | 691 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
692 | { |
693 | int ret = 0; | |
694 | ||
695 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
696 | switch (event->type) { |
697 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
698 | { | |
699 | struct lttng_kernel_event_recorder *event_recorder = | |
700 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
701 | ||
f7d06400 | 702 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
703 | ret = -EPERM; |
704 | goto end; | |
705 | } | |
b01155ba | 706 | break; |
9d993668 MD |
707 | } |
708 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
709 | switch (event->priv->instrumentation) { | |
710 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
711 | ret = -EINVAL; | |
712 | goto end; | |
713 | default: | |
714 | break; | |
715 | } | |
2b16f0c9 | 716 | break; |
dffef45d | 717 | default: |
9d993668 | 718 | break; |
dffef45d | 719 | } |
dffef45d | 720 | |
a67ba386 | 721 | if (!event->enabled) { |
dffef45d FD |
722 | ret = -EEXIST; |
723 | goto end; | |
724 | } | |
a67ba386 | 725 | switch (event->priv->instrumentation) { |
c190d76e MJ |
726 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
727 | lttng_fallthrough; | |
606828e4 | 728 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
729 | ret = -EINVAL; |
730 | break; | |
b4a75708 | 731 | |
c190d76e MJ |
732 | case LTTNG_KERNEL_ABI_KPROBE: |
733 | lttng_fallthrough; | |
606828e4 | 734 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 735 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 736 | break; |
b4a75708 | 737 | |
9d993668 MD |
738 | case LTTNG_KERNEL_ABI_KRETPROBE: |
739 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
740 | break; | |
741 | ||
c190d76e MJ |
742 | case LTTNG_KERNEL_ABI_FUNCTION: |
743 | lttng_fallthrough; | |
744 | case LTTNG_KERNEL_ABI_NOOP: | |
745 | lttng_fallthrough; | |
dffef45d FD |
746 | default: |
747 | WARN_ON_ONCE(1); | |
748 | ret = -EINVAL; | |
749 | } | |
750 | end: | |
751 | mutex_unlock(&sessions_mutex); | |
752 | return ret; | |
753 | } | |
754 | ||
f7d06400 | 755 | struct lttng_kernel_channel_buffer *lttng_channel_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
756 | const char *transport_name, |
757 | void *buf_addr, | |
4e3c1b9b MD |
758 | size_t subbuf_size, size_t num_subbuf, |
759 | unsigned int switch_timer_interval, | |
d83004aa JD |
760 | unsigned int read_timer_interval, |
761 | enum channel_type channel_type) | |
4e3c1b9b | 762 | { |
f7d06400 MD |
763 | struct lttng_kernel_channel_buffer *chan; |
764 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 765 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
766 | |
767 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 768 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 769 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 770 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 771 | if (!transport) { |
5a15f70c | 772 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 773 | transport_name); |
c0e31d2e | 774 | goto notransport; |
f3d01b96 | 775 | } |
a33c9927 | 776 | if (!try_module_get(transport->owner)) { |
5a15f70c | 777 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
778 | goto notransport; |
779 | } | |
f7d06400 | 780 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 781 | if (!chan) |
c0e31d2e | 782 | goto nomem; |
f7d06400 MD |
783 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
784 | if (!chan_priv) | |
785 | goto nomem_priv; | |
786 | chan->priv = chan_priv; | |
787 | chan_priv->pub = chan; | |
788 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
789 | chan->parent.session = session; | |
790 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 791 | chan->ops = &transport->ops; |
125b4df4 MD |
792 | /* |
793 | * Note: the channel creation op already writes into the packet | |
794 | * headers. Therefore the "chan" information used as input | |
795 | * should be already accessible. | |
796 | */ | |
f7d06400 | 797 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
798 | chan, buf_addr, subbuf_size, num_subbuf, |
799 | switch_timer_interval, read_timer_interval); | |
f7d06400 | 800 | if (!chan->priv->rb_chan) |
f3d01b96 | 801 | goto create_error; |
f7d06400 MD |
802 | chan->priv->parent.tstate = 1; |
803 | chan->parent.enabled = 1; | |
804 | chan->priv->transport = transport; | |
805 | chan->priv->channel_type = channel_type; | |
806 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
807 | mutex_unlock(&sessions_mutex); |
808 | return chan; | |
809 | ||
f3d01b96 | 810 | create_error: |
f7d06400 MD |
811 | kfree(chan_priv); |
812 | nomem_priv: | |
f3d01b96 | 813 | kfree(chan); |
c0e31d2e | 814 | nomem: |
a33c9927 MD |
815 | if (transport) |
816 | module_put(transport->owner); | |
c0e31d2e | 817 | notransport: |
e5382b6d | 818 | active: |
4e3c1b9b MD |
819 | mutex_unlock(&sessions_mutex); |
820 | return NULL; | |
821 | } | |
822 | ||
823 | /* | |
d83004aa JD |
824 | * Only used internally at session destruction for per-cpu channels, and |
825 | * when metadata channel is released. | |
826 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 827 | */ |
aa7c23a9 | 828 | static |
f7d06400 | 829 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 830 | { |
f7d06400 MD |
831 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
832 | module_put(chan->priv->transport->owner); | |
833 | list_del(&chan->priv->node); | |
834 | lttng_kernel_destroy_context(chan->priv->ctx); | |
835 | kfree(chan->priv); | |
4e3c1b9b MD |
836 | kfree(chan); |
837 | } | |
838 | ||
f7d06400 | 839 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 840 | { |
f7d06400 | 841 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
842 | |
843 | /* Protect the metadata cache with the sessions_mutex. */ | |
844 | mutex_lock(&sessions_mutex); | |
845 | _lttng_channel_destroy(chan); | |
846 | mutex_unlock(&sessions_mutex); | |
847 | } | |
848 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
849 | ||
850 | static | |
851 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
852 | { | |
853 | stream->finalized = 1; | |
854 | wake_up_interruptible(&stream->read_wait); | |
855 | } | |
856 | ||
a101fa10 | 857 | |
e5382b6d MD |
858 | /* |
859 | * Supports event creation while tracing session is active. | |
3c997079 | 860 | * Needs to be called with sessions mutex held. |
e5382b6d | 861 | */ |
def1e304 MD |
862 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_enabler *event_enabler, |
863 | const struct lttng_kernel_event_desc *event_desc) | |
4e3c1b9b | 864 | { |
def1e304 MD |
865 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
866 | struct lttng_kernel_abi_event *event_param = &event_enabler->base.event_param; | |
867 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
f7d06400 | 868 | struct lttng_kernel_session *session = chan->parent.session; |
a67ba386 MD |
869 | struct lttng_kernel_event_recorder *event_recorder; |
870 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
871 | const char *event_name; |
872 | struct hlist_head *head; | |
3d084699 | 873 | int ret; |
4e3c1b9b | 874 | |
f7d06400 | 875 | if (chan->priv->free_event_id == -1U) { |
4cf0bf51 | 876 | ret = -EMFILE; |
e5382b6d | 877 | goto full; |
abc0446a | 878 | } |
3c997079 MD |
879 | |
880 | switch (itype) { | |
606828e4 | 881 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 882 | event_name = event_desc->event_name; |
3c997079 | 883 | break; |
b4a75708 | 884 | |
c190d76e MJ |
885 | case LTTNG_KERNEL_ABI_KPROBE: |
886 | lttng_fallthrough; | |
887 | case LTTNG_KERNEL_ABI_UPROBE: | |
888 | lttng_fallthrough; | |
889 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
890 | lttng_fallthrough; | |
606828e4 | 891 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
892 | event_name = event_param->name; |
893 | break; | |
b4a75708 | 894 | |
c190d76e MJ |
895 | case LTTNG_KERNEL_ABI_FUNCTION: |
896 | lttng_fallthrough; | |
897 | case LTTNG_KERNEL_ABI_NOOP: | |
898 | lttng_fallthrough; | |
3c997079 MD |
899 | default: |
900 | WARN_ON_ONCE(1); | |
901 | ret = -EINVAL; | |
902 | goto type_error; | |
903 | } | |
4a11ef1c | 904 | |
8cdc1a81 | 905 | head = utils_borrow_hash_table_bucket(session->priv->events_ht.table, |
4a11ef1c | 906 | LTTNG_EVENT_HT_SIZE, event_name); |
a67ba386 MD |
907 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
908 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
909 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 910 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 911 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
912 | ret = -EEXIST; |
913 | goto exist; | |
abc0446a MD |
914 | } |
915 | } | |
3c997079 | 916 | |
a67ba386 MD |
917 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
918 | if (!event_recorder) { | |
4cf0bf51 | 919 | ret = -ENOMEM; |
4e3c1b9b | 920 | goto cache_error; |
abc0446a | 921 | } |
a67ba386 MD |
922 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
923 | if (!event_recorder_priv) { | |
924 | ret = -ENOMEM; | |
925 | goto cache_private_error; | |
926 | } | |
927 | event_recorder_priv->pub = event_recorder; | |
928 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
929 | event_recorder->priv = event_recorder_priv; | |
930 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
931 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
932 | ||
8a445457 | 933 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 934 | event_recorder->chan = chan; |
f7d06400 | 935 | event_recorder->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
936 | event_recorder->priv->parent.instrumentation = itype; |
937 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
938 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
939 | |
940 | switch (itype) { | |
606828e4 | 941 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 942 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
943 | event_recorder->parent.enabled = 0; |
944 | event_recorder->priv->parent.registered = 0; | |
945 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
946 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 947 | ret = -ENOENT; |
d3dbe23c | 948 | goto register_error; |
abc0446a | 949 | } |
3c997079 MD |
950 | /* Populate lttng_event structure before event registration. */ |
951 | smp_wmb(); | |
baf20995 | 952 | break; |
b4a75708 | 953 | |
606828e4 | 954 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
955 | /* |
956 | * Needs to be explicitly enabled after creation, since | |
957 | * we may want to apply filters. | |
958 | */ | |
a67ba386 MD |
959 | event_recorder->parent.enabled = 0; |
960 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
961 | /* |
962 | * Populate lttng_event structure before event | |
963 | * registration. | |
964 | */ | |
965 | smp_wmb(); | |
8bf17deb | 966 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
967 | event_param->u.kprobe.symbol_name, |
968 | event_param->u.kprobe.offset, | |
969 | event_param->u.kprobe.addr, | |
a67ba386 | 970 | event_recorder); |
abc0446a | 971 | if (ret) { |
4cf0bf51 | 972 | ret = -EINVAL; |
d6d808f3 | 973 | goto register_error; |
abc0446a | 974 | } |
a67ba386 | 975 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 976 | WARN_ON_ONCE(!ret); |
d6d808f3 | 977 | break; |
b4a75708 | 978 | |
606828e4 | 979 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 980 | { |
a67ba386 MD |
981 | struct lttng_kernel_event_recorder *event_recorder_return; |
982 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
983 | |
984 | /* kretprobe defines 2 events */ | |
a0493bef MD |
985 | /* |
986 | * Needs to be explicitly enabled after creation, since | |
987 | * we may want to apply filters. | |
988 | */ | |
a67ba386 MD |
989 | event_recorder->parent.enabled = 0; |
990 | event_recorder->priv->parent.registered = 1; | |
991 | ||
992 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
993 | if (!event_recorder_return) { | |
994 | ret = -ENOMEM; | |
995 | goto register_error; | |
996 | } | |
997 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
998 | if (!event_recorder_return_priv) { | |
999 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1000 | ret = -ENOMEM; |
7371f44c | 1001 | goto register_error; |
abc0446a | 1002 | } |
a67ba386 MD |
1003 | event_recorder_return_priv->pub = event_recorder_return; |
1004 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
1005 | event_recorder_return->priv = event_recorder_return_priv; | |
1006 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
1007 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
1008 | ||
8a445457 | 1009 | event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 1010 | event_recorder_return->chan = chan; |
f7d06400 | 1011 | event_recorder_return->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
1012 | event_recorder_return->priv->parent.instrumentation = itype; |
1013 | event_recorder_return->parent.enabled = 0; | |
1014 | event_recorder_return->priv->parent.registered = 1; | |
1015 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
1016 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 1017 | /* |
a90917c3 | 1018 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1019 | */ |
1020 | smp_wmb(); | |
3c997079 | 1021 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1022 | event_param->u.kretprobe.symbol_name, |
1023 | event_param->u.kretprobe.offset, | |
1024 | event_param->u.kretprobe.addr, | |
a67ba386 | 1025 | event_recorder, event_recorder_return); |
7371f44c | 1026 | if (ret) { |
a67ba386 MD |
1027 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1028 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1029 | ret = -EINVAL; |
7371f44c MD |
1030 | goto register_error; |
1031 | } | |
1032 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1033 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1034 | WARN_ON_ONCE(!ret); |
a67ba386 | 1035 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1036 | WARN_ON_ONCE(!ret); |
f7d06400 | 1037 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, |
a67ba386 | 1038 | event_recorder_return); |
abc0446a | 1039 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1040 | if (ret) { |
a67ba386 MD |
1041 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1042 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
1043 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1044 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1045 | goto statedump_error; |
1046 | } | |
f7d06400 | 1047 | list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events); |
7371f44c MD |
1048 | break; |
1049 | } | |
b4a75708 | 1050 | |
606828e4 | 1051 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1052 | /* |
1053 | * Needs to be explicitly enabled after creation, since | |
1054 | * we may want to apply filters. | |
1055 | */ | |
a67ba386 MD |
1056 | event_recorder->parent.enabled = 0; |
1057 | event_recorder->priv->parent.registered = 0; | |
1058 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1059 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1060 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1061 | ret = -EINVAL; |
1062 | goto register_error; | |
606828e4 | 1063 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1064 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1065 | break; |
606828e4 | 1066 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1067 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1068 | break; |
1069 | } | |
1070 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1071 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1072 | ret = -EINVAL; |
1073 | goto register_error; | |
606828e4 | 1074 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1075 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1076 | break; |
606828e4 | 1077 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1078 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1079 | break; |
1080 | } | |
a67ba386 | 1081 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1082 | ret = -EINVAL; |
259b6cb3 | 1083 | goto register_error; |
abc0446a | 1084 | } |
1ec65de1 | 1085 | break; |
b4a75708 | 1086 | |
606828e4 | 1087 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1088 | /* |
1089 | * Needs to be explicitly enabled after creation, since | |
1090 | * we may want to apply filters. | |
1091 | */ | |
a67ba386 MD |
1092 | event_recorder->parent.enabled = 0; |
1093 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1094 | |
a344f64b FD |
1095 | /* |
1096 | * Populate lttng_event structure before event | |
1097 | * registration. | |
1098 | */ | |
1099 | smp_wmb(); | |
149b9a9d | 1100 | |
83b802dc | 1101 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1102 | event_param->u.uprobe.fd, |
a67ba386 | 1103 | event_recorder); |
149b9a9d YB |
1104 | if (ret) |
1105 | goto register_error; | |
a67ba386 | 1106 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1107 | WARN_ON_ONCE(!ret); |
1108 | break; | |
b4a75708 | 1109 | |
c190d76e MJ |
1110 | case LTTNG_KERNEL_ABI_FUNCTION: |
1111 | lttng_fallthrough; | |
1112 | case LTTNG_KERNEL_ABI_NOOP: | |
1113 | lttng_fallthrough; | |
baf20995 MD |
1114 | default: |
1115 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1116 | ret = -EINVAL; |
df07930b | 1117 | goto register_error; |
baf20995 | 1118 | } |
f7d06400 | 1119 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder); |
abc0446a MD |
1120 | WARN_ON_ONCE(ret > 0); |
1121 | if (ret) { | |
c099397a | 1122 | goto statedump_error; |
abc0446a | 1123 | } |
a67ba386 | 1124 | hlist_add_head(&event_recorder->priv->hlist, head); |
f7d06400 | 1125 | list_add(&event_recorder->priv->node, &chan->parent.session->priv->events); |
a67ba386 | 1126 | return event_recorder; |
4e3c1b9b | 1127 | |
c099397a | 1128 | statedump_error: |
259b6cb3 | 1129 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1130 | register_error: |
a67ba386 MD |
1131 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1132 | cache_private_error: | |
1133 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1134 | cache_error: |
1135 | exist: | |
3c997079 | 1136 | type_error: |
e5382b6d | 1137 | full: |
4cf0bf51 | 1138 | return ERR_PTR(ret); |
4e3c1b9b MD |
1139 | } |
1140 | ||
a67ba386 | 1141 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1142 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1143 | uint64_t token, uint64_t error_counter_index, |
1144 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1145 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1146 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1147 | { |
a67ba386 MD |
1148 | struct lttng_kernel_event_notifier *event_notifier; |
1149 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1150 | struct lttng_counter *error_counter; |
dffef45d FD |
1151 | const char *event_name; |
1152 | struct hlist_head *head; | |
1153 | int ret; | |
1154 | ||
1155 | switch (itype) { | |
606828e4 | 1156 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1157 | event_name = event_desc->event_name; |
b01155ba | 1158 | break; |
b4a75708 | 1159 | |
c190d76e MJ |
1160 | case LTTNG_KERNEL_ABI_KPROBE: |
1161 | lttng_fallthrough; | |
1162 | case LTTNG_KERNEL_ABI_UPROBE: | |
1163 | lttng_fallthrough; | |
606828e4 | 1164 | case LTTNG_KERNEL_ABI_SYSCALL: |
2b16f0c9 FD |
1165 | event_name = event_notifier_param->event.name; |
1166 | break; | |
b4a75708 | 1167 | |
c190d76e MJ |
1168 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1169 | lttng_fallthrough; | |
1170 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1171 | lttng_fallthrough; | |
1172 | case LTTNG_KERNEL_ABI_NOOP: | |
1173 | lttng_fallthrough; | |
dffef45d FD |
1174 | default: |
1175 | WARN_ON_ONCE(1); | |
1176 | ret = -EINVAL; | |
1177 | goto type_error; | |
1178 | } | |
1179 | ||
1180 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1181 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
a67ba386 MD |
1182 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1183 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1184 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1185 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1186 | && event_notifier_group == event_notifier_priv->group |
1187 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1188 | ret = -EEXIST; |
1189 | goto exist; | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1194 | if (!event_notifier) { | |
1195 | ret = -ENOMEM; | |
1196 | goto cache_error; | |
1197 | } | |
a67ba386 MD |
1198 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1199 | if (!event_notifier_priv) { | |
1200 | ret = -ENOMEM; | |
1201 | goto cache_private_error; | |
1202 | } | |
1203 | event_notifier_priv->pub = event_notifier; | |
1204 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1205 | event_notifier->priv = event_notifier_priv; | |
1206 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1207 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1208 | ||
1209 | event_notifier->priv->group = event_notifier_group; | |
1210 | event_notifier->priv->parent.user_token = token; | |
1211 | event_notifier->priv->error_counter_index = error_counter_index; | |
1212 | event_notifier->priv->num_captures = 0; | |
1213 | event_notifier->priv->parent.instrumentation = itype; | |
1214 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1215 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1216 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1217 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
8a445457 | 1218 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; |
dffef45d FD |
1219 | |
1220 | switch (itype) { | |
606828e4 | 1221 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1222 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1223 | event_notifier->parent.enabled = 0; |
1224 | event_notifier->priv->parent.registered = 0; | |
1225 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1226 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1227 | ret = -ENOENT; |
1228 | goto register_error; | |
1229 | } | |
1230 | /* Populate lttng_event_notifier structure before event registration. */ | |
1231 | smp_wmb(); | |
1232 | break; | |
b4a75708 | 1233 | |
606828e4 | 1234 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1235 | /* |
1236 | * Needs to be explicitly enabled after creation, since | |
1237 | * we may want to apply filters. | |
1238 | */ | |
a67ba386 MD |
1239 | event_notifier->parent.enabled = 0; |
1240 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1241 | /* |
1242 | * Populate lttng_event_notifier structure before event | |
1243 | * registration. | |
1244 | */ | |
1245 | smp_wmb(); | |
1246 | ret = lttng_kprobes_register_event_notifier( | |
1247 | event_notifier_param->event.u.kprobe.symbol_name, | |
1248 | event_notifier_param->event.u.kprobe.offset, | |
1249 | event_notifier_param->event.u.kprobe.addr, | |
1250 | event_notifier); | |
1251 | if (ret) { | |
1252 | ret = -EINVAL; | |
1253 | goto register_error; | |
1254 | } | |
a67ba386 | 1255 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1256 | WARN_ON_ONCE(!ret); |
1257 | break; | |
b4a75708 | 1258 | |
606828e4 | 1259 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1260 | /* |
1261 | * Needs to be explicitly enabled after creation, since | |
1262 | * we may want to apply filters. | |
1263 | */ | |
a67ba386 MD |
1264 | event_notifier->parent.enabled = 0; |
1265 | event_notifier->priv->parent.registered = 0; | |
1266 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1267 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1268 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1269 | ret = -EINVAL; |
1270 | goto register_error; | |
606828e4 | 1271 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1272 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1273 | break; |
606828e4 | 1274 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1275 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1276 | break; |
1277 | } | |
1278 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1279 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1280 | ret = -EINVAL; |
1281 | goto register_error; | |
606828e4 | 1282 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1283 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1284 | break; |
606828e4 | 1285 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1286 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1287 | break; |
1288 | } | |
1289 | ||
a67ba386 | 1290 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1291 | ret = -EINVAL; |
1292 | goto register_error; | |
1293 | } | |
1294 | break; | |
b4a75708 | 1295 | |
606828e4 | 1296 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1297 | /* |
1298 | * Needs to be explicitly enabled after creation, since | |
1299 | * we may want to apply filters. | |
1300 | */ | |
a67ba386 MD |
1301 | event_notifier->parent.enabled = 0; |
1302 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1303 | |
1304 | /* | |
1305 | * Populate lttng_event_notifier structure before | |
1306 | * event_notifier registration. | |
1307 | */ | |
1308 | smp_wmb(); | |
1309 | ||
1310 | ret = lttng_uprobes_register_event_notifier( | |
1311 | event_notifier_param->event.name, | |
1312 | event_notifier_param->event.u.uprobe.fd, | |
1313 | event_notifier); | |
1314 | if (ret) | |
1315 | goto register_error; | |
a67ba386 | 1316 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1317 | WARN_ON_ONCE(!ret); |
1318 | break; | |
b4a75708 | 1319 | |
c190d76e MJ |
1320 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1321 | lttng_fallthrough; | |
1322 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1323 | lttng_fallthrough; | |
1324 | case LTTNG_KERNEL_ABI_NOOP: | |
1325 | lttng_fallthrough; | |
dffef45d FD |
1326 | default: |
1327 | WARN_ON_ONCE(1); | |
1328 | ret = -EINVAL; | |
1329 | goto register_error; | |
1330 | } | |
1331 | ||
a67ba386 MD |
1332 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1333 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1334 | |
1335 | /* | |
1336 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1337 | * bucket is currently in use. We trust it. The session lock |
1338 | * synchronizes against concurrent creation of the error | |
1339 | * counter. | |
99f52fcc | 1340 | */ |
ab04d7b1 MD |
1341 | error_counter = event_notifier_group->error_counter; |
1342 | if (error_counter) { | |
99f52fcc FD |
1343 | size_t dimension_index[1]; |
1344 | ||
1345 | /* | |
1346 | * Check that the index is within the boundary of the counter. | |
1347 | */ | |
a67ba386 | 1348 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1349 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1350 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1351 | ret = -EINVAL; |
1352 | goto register_error; | |
1353 | } | |
1354 | ||
a67ba386 | 1355 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1356 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1357 | if (ret) { |
1358 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1359 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1360 | goto register_error; |
1361 | } | |
1362 | } | |
1363 | ||
dffef45d FD |
1364 | return event_notifier; |
1365 | ||
1366 | register_error: | |
a67ba386 MD |
1367 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1368 | cache_private_error: | |
dffef45d FD |
1369 | kmem_cache_free(event_notifier_cache, event_notifier); |
1370 | cache_error: | |
1371 | exist: | |
1372 | type_error: | |
1373 | return ERR_PTR(ret); | |
1374 | } | |
1375 | ||
99f52fcc FD |
1376 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1377 | const size_t *dim_indexes, int32_t cpu, | |
1378 | int64_t *val, bool *overflow, bool *underflow) | |
1379 | { | |
1380 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1381 | cpu, val, overflow, underflow); | |
1382 | } | |
1383 | ||
1384 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1385 | const size_t *dim_indexes, int64_t *val, | |
1386 | bool *overflow, bool *underflow) | |
1387 | { | |
1388 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1389 | val, overflow, underflow); | |
1390 | } | |
1391 | ||
1392 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1393 | const size_t *dim_indexes) | |
1394 | { | |
1395 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1396 | } | |
1397 | ||
def1e304 MD |
1398 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_event_enabler *event_enabler, |
1399 | const struct lttng_kernel_event_desc *event_desc) | |
3c997079 | 1400 | { |
a67ba386 | 1401 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1402 | |
1403 | mutex_lock(&sessions_mutex); | |
def1e304 | 1404 | event = _lttng_kernel_event_recorder_create(event_enabler, event_desc); |
3c997079 MD |
1405 | mutex_unlock(&sessions_mutex); |
1406 | return event; | |
1407 | } | |
1408 | ||
a67ba386 | 1409 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1410 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1411 | uint64_t id, uint64_t error_counter_index, |
1412 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1413 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1414 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1415 | { |
a67ba386 | 1416 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1417 | |
1418 | mutex_lock(&sessions_mutex); | |
1419 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1420 | error_counter_index, event_notifier_group, |
a67ba386 | 1421 | event_notifier_param, itype); |
dffef45d FD |
1422 | mutex_unlock(&sessions_mutex); |
1423 | return event_notifier; | |
1424 | } | |
1425 | ||
3c997079 MD |
1426 | /* Only used for tracepoints for now. */ |
1427 | static | |
a67ba386 | 1428 | void register_event(struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 1429 | { |
437d5aa5 | 1430 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1431 | int ret = -EINVAL; |
3c997079 | 1432 | |
a67ba386 | 1433 | if (event_recorder->priv->parent.registered) |
3c997079 | 1434 | return; |
4ecb5ad5 | 1435 | |
a67ba386 MD |
1436 | desc = event_recorder->priv->parent.desc; |
1437 | switch (event_recorder->priv->parent.instrumentation) { | |
606828e4 | 1438 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1439 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1440 | desc->tp_class->probe_callback, |
a67ba386 | 1441 | event_recorder); |
4ecb5ad5 | 1442 | break; |
b4a75708 | 1443 | |
606828e4 | 1444 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1445 | ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1446 | break; |
b4a75708 | 1447 | |
c190d76e MJ |
1448 | case LTTNG_KERNEL_ABI_KPROBE: |
1449 | lttng_fallthrough; | |
1450 | case LTTNG_KERNEL_ABI_UPROBE: | |
1451 | lttng_fallthrough; | |
606828e4 | 1452 | case LTTNG_KERNEL_ABI_KRETPROBE: |
4ecb5ad5 MD |
1453 | ret = 0; |
1454 | break; | |
b4a75708 | 1455 | |
c190d76e MJ |
1456 | case LTTNG_KERNEL_ABI_FUNCTION: |
1457 | lttng_fallthrough; | |
1458 | case LTTNG_KERNEL_ABI_NOOP: | |
1459 | lttng_fallthrough; | |
4ecb5ad5 MD |
1460 | default: |
1461 | WARN_ON_ONCE(1); | |
1462 | } | |
3c997079 | 1463 | if (!ret) |
a67ba386 | 1464 | event_recorder->priv->parent.registered = 1; |
3c997079 MD |
1465 | } |
1466 | ||
4e3c1b9b MD |
1467 | /* |
1468 | * Only used internally at session destruction. | |
1469 | */ | |
a67ba386 | 1470 | int _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder) |
4e3c1b9b | 1471 | { |
a67ba386 | 1472 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
437d5aa5 | 1473 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1474 | int ret = -EINVAL; |
1475 | ||
a67ba386 | 1476 | if (!event_priv->registered) |
3c997079 MD |
1477 | return 0; |
1478 | ||
a67ba386 MD |
1479 | desc = event_priv->desc; |
1480 | switch (event_priv->instrumentation) { | |
606828e4 | 1481 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1482 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1483 | event_priv->desc->tp_class->probe_callback, |
a67ba386 | 1484 | event_recorder); |
baf20995 | 1485 | break; |
b4a75708 | 1486 | |
606828e4 | 1487 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 | 1488 | lttng_kprobes_unregister_event(event_recorder); |
d6d808f3 MD |
1489 | ret = 0; |
1490 | break; | |
b4a75708 | 1491 | |
606828e4 | 1492 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 1493 | lttng_kretprobes_unregister(event_recorder); |
7371f44c MD |
1494 | ret = 0; |
1495 | break; | |
b4a75708 | 1496 | |
606828e4 | 1497 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1498 | ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1499 | break; |
b4a75708 | 1500 | |
606828e4 | 1501 | case LTTNG_KERNEL_ABI_NOOP: |
259b6cb3 MD |
1502 | ret = 0; |
1503 | break; | |
b4a75708 | 1504 | |
606828e4 | 1505 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 1506 | lttng_uprobes_unregister_event(event_recorder); |
149b9a9d YB |
1507 | ret = 0; |
1508 | break; | |
b4a75708 | 1509 | |
c190d76e MJ |
1510 | case LTTNG_KERNEL_ABI_FUNCTION: |
1511 | lttng_fallthrough; | |
baf20995 MD |
1512 | default: |
1513 | WARN_ON_ONCE(1); | |
1514 | } | |
3c997079 | 1515 | if (!ret) |
a67ba386 | 1516 | event_priv->registered = 0; |
dda6a249 MD |
1517 | return ret; |
1518 | } | |
1519 | ||
dffef45d FD |
1520 | /* Only used for tracepoints for now. */ |
1521 | static | |
a67ba386 | 1522 | void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1523 | { |
437d5aa5 | 1524 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1525 | int ret = -EINVAL; |
1526 | ||
a67ba386 | 1527 | if (event_notifier->priv->parent.registered) |
dffef45d FD |
1528 | return; |
1529 | ||
a67ba386 MD |
1530 | desc = event_notifier->priv->parent.desc; |
1531 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1532 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1533 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1534 | desc->tp_class->probe_callback, |
b01155ba FD |
1535 | event_notifier); |
1536 | break; | |
b4a75708 | 1537 | |
606828e4 | 1538 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1539 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); |
1540 | break; | |
b4a75708 | 1541 | |
c190d76e MJ |
1542 | case LTTNG_KERNEL_ABI_KPROBE: |
1543 | lttng_fallthrough; | |
606828e4 | 1544 | case LTTNG_KERNEL_ABI_UPROBE: |
2b16f0c9 FD |
1545 | ret = 0; |
1546 | break; | |
b4a75708 | 1547 | |
c190d76e MJ |
1548 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1549 | lttng_fallthrough; | |
1550 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1551 | lttng_fallthrough; | |
1552 | case LTTNG_KERNEL_ABI_NOOP: | |
1553 | lttng_fallthrough; | |
dffef45d FD |
1554 | default: |
1555 | WARN_ON_ONCE(1); | |
1556 | } | |
1557 | if (!ret) | |
a67ba386 | 1558 | event_notifier->priv->parent.registered = 1; |
dffef45d FD |
1559 | } |
1560 | ||
1561 | static | |
1562 | int _lttng_event_notifier_unregister( | |
a67ba386 | 1563 | struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1564 | { |
437d5aa5 | 1565 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1566 | int ret = -EINVAL; |
1567 | ||
a67ba386 | 1568 | if (!event_notifier->priv->parent.registered) |
dffef45d FD |
1569 | return 0; |
1570 | ||
a67ba386 MD |
1571 | desc = event_notifier->priv->parent.desc; |
1572 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1573 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1574 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname, |
6c8c025b | 1575 | event_notifier->priv->parent.desc->tp_class->probe_callback, |
b01155ba FD |
1576 | event_notifier); |
1577 | break; | |
b4a75708 | 1578 | |
606828e4 | 1579 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1580 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1581 | ret = 0; | |
1582 | break; | |
b4a75708 | 1583 | |
606828e4 | 1584 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1585 | lttng_uprobes_unregister_event_notifier(event_notifier); |
1586 | ret = 0; | |
1587 | break; | |
b4a75708 | 1588 | |
606828e4 | 1589 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1590 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); |
1591 | break; | |
b4a75708 | 1592 | |
c190d76e MJ |
1593 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1594 | lttng_fallthrough; | |
1595 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1596 | lttng_fallthrough; | |
1597 | case LTTNG_KERNEL_ABI_NOOP: | |
1598 | lttng_fallthrough; | |
dffef45d FD |
1599 | default: |
1600 | WARN_ON_ONCE(1); | |
1601 | } | |
1602 | if (!ret) | |
a67ba386 | 1603 | event_notifier->priv->parent.registered = 0; |
dffef45d FD |
1604 | return ret; |
1605 | } | |
1606 | ||
dda6a249 MD |
1607 | /* |
1608 | * Only used internally at session destruction. | |
1609 | */ | |
be066e6c | 1610 | static |
0648898e | 1611 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1612 | { |
0648898e | 1613 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1614 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1615 | ||
0648898e MD |
1616 | lttng_free_event_filter_runtime(event); |
1617 | /* Free event enabler refs */ | |
1618 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1619 | &event_priv->enablers_ref_head, node) | |
1620 | kfree(enabler_ref); | |
b4a75708 | 1621 | |
0648898e MD |
1622 | switch (event->type) { |
1623 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1624 | { | |
1625 | struct lttng_kernel_event_recorder *event_recorder = | |
1626 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1627 | |
0648898e MD |
1628 | switch (event_priv->instrumentation) { |
1629 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1630 | lttng_event_desc_put(event_priv->desc); | |
1631 | break; | |
b4a75708 | 1632 | |
0648898e MD |
1633 | case LTTNG_KERNEL_ABI_KPROBE: |
1634 | module_put(event_priv->desc->owner); | |
1635 | lttng_kprobes_destroy_event_private(event_recorder); | |
1636 | break; | |
b4a75708 | 1637 | |
0648898e MD |
1638 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1639 | module_put(event_priv->desc->owner); | |
1640 | lttng_kretprobes_destroy_private(event_recorder); | |
1641 | break; | |
b4a75708 | 1642 | |
0648898e MD |
1643 | case LTTNG_KERNEL_ABI_SYSCALL: |
1644 | break; | |
4e3c1b9b | 1645 | |
0648898e MD |
1646 | case LTTNG_KERNEL_ABI_UPROBE: |
1647 | module_put(event_priv->desc->owner); | |
1648 | lttng_uprobes_destroy_event_private(event_recorder); | |
1649 | break; | |
3ef5cc03 | 1650 | |
c190d76e MJ |
1651 | case LTTNG_KERNEL_ABI_FUNCTION: |
1652 | lttng_fallthrough; | |
1653 | case LTTNG_KERNEL_ABI_NOOP: | |
1654 | lttng_fallthrough; | |
0648898e MD |
1655 | default: |
1656 | WARN_ON_ONCE(1); | |
1657 | } | |
1658 | list_del(&event_recorder->priv->node); | |
1659 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1660 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1661 | break; |
0648898e MD |
1662 | } |
1663 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1664 | { | |
1665 | struct lttng_kernel_event_notifier *event_notifier = | |
1666 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1667 | |
0648898e MD |
1668 | switch (event_notifier->priv->parent.instrumentation) { |
1669 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1670 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1671 | break; | |
b4a75708 | 1672 | |
0648898e MD |
1673 | case LTTNG_KERNEL_ABI_KPROBE: |
1674 | module_put(event_notifier->priv->parent.desc->owner); | |
1675 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1676 | break; | |
b4a75708 | 1677 | |
0648898e MD |
1678 | case LTTNG_KERNEL_ABI_SYSCALL: |
1679 | break; | |
b4a75708 | 1680 | |
0648898e MD |
1681 | case LTTNG_KERNEL_ABI_UPROBE: |
1682 | module_put(event_notifier->priv->parent.desc->owner); | |
1683 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1684 | break; | |
1685 | ||
c190d76e MJ |
1686 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1687 | lttng_fallthrough; | |
1688 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1689 | lttng_fallthrough; | |
1690 | case LTTNG_KERNEL_ABI_NOOP: | |
1691 | lttng_fallthrough; | |
0648898e MD |
1692 | default: |
1693 | WARN_ON_ONCE(1); | |
1694 | } | |
1695 | list_del(&event_notifier->priv->node); | |
1696 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1697 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1698 | break; | |
1699 | } | |
dffef45d FD |
1700 | default: |
1701 | WARN_ON_ONCE(1); | |
1702 | } | |
dffef45d FD |
1703 | } |
1704 | ||
8c0393c3 | 1705 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1706 | enum tracker_type tracker_type) |
e0130fab | 1707 | { |
d1f652f8 MD |
1708 | switch (tracker_type) { |
1709 | case TRACKER_PID: | |
1710 | return &session->pid_tracker; | |
1711 | case TRACKER_VPID: | |
1712 | return &session->vpid_tracker; | |
1713 | case TRACKER_UID: | |
1714 | return &session->uid_tracker; | |
1715 | case TRACKER_VUID: | |
1716 | return &session->vuid_tracker; | |
1717 | case TRACKER_GID: | |
1718 | return &session->gid_tracker; | |
1719 | case TRACKER_VGID: | |
1720 | return &session->vgid_tracker; | |
1721 | default: | |
1722 | WARN_ON_ONCE(1); | |
1723 | return NULL; | |
1724 | } | |
1725 | } | |
1726 | ||
8cdc1a81 | 1727 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1728 | enum tracker_type tracker_type, int id) |
1729 | { | |
8c0393c3 | 1730 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1731 | int ret; |
1732 | ||
d1f652f8 MD |
1733 | tracker = get_tracker(session, tracker_type); |
1734 | if (!tracker) | |
1735 | return -EINVAL; | |
1736 | if (id < -1) | |
e0130fab MD |
1737 | return -EINVAL; |
1738 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1739 | if (id == -1) { |
1740 | /* track all ids: destroy tracker. */ | |
1741 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1742 | ret = 0; |
1743 | } else { | |
d1f652f8 | 1744 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1745 | } |
e0130fab MD |
1746 | mutex_unlock(&sessions_mutex); |
1747 | return ret; | |
1748 | } | |
1749 | ||
8cdc1a81 | 1750 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1751 | enum tracker_type tracker_type, int id) |
e0130fab | 1752 | { |
8c0393c3 | 1753 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1754 | int ret; |
1755 | ||
d1f652f8 MD |
1756 | tracker = get_tracker(session, tracker_type); |
1757 | if (!tracker) | |
1758 | return -EINVAL; | |
1759 | if (id < -1) | |
e0130fab MD |
1760 | return -EINVAL; |
1761 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1762 | if (id == -1) { |
1763 | /* untrack all ids: replace by empty tracker. */ | |
1764 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1765 | } else { |
d1f652f8 | 1766 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1767 | } |
e0130fab MD |
1768 | mutex_unlock(&sessions_mutex); |
1769 | return ret; | |
1770 | } | |
1771 | ||
7e6f9ef6 | 1772 | static |
d1f652f8 | 1773 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1774 | { |
8c0393c3 MD |
1775 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1776 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1777 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1778 | int iter = 0, i; |
1779 | ||
1780 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1781 | if (id_tracker_p) { |
1782 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1783 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1784 | |
f934e302 | 1785 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1786 | if (iter++ >= *pos) |
1787 | return e; | |
1788 | } | |
1789 | } | |
1790 | } else { | |
d1f652f8 | 1791 | /* ID tracker disabled. */ |
7e6f9ef6 | 1792 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1793 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1794 | } |
1795 | iter++; | |
1796 | } | |
1797 | /* End of list */ | |
1798 | return NULL; | |
1799 | } | |
1800 | ||
1801 | /* Called with sessions_mutex held. */ | |
1802 | static | |
d1f652f8 | 1803 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1804 | { |
8c0393c3 MD |
1805 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1806 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1807 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1808 | int iter = 0, i; |
1809 | ||
1810 | (*ppos)++; | |
d1f652f8 MD |
1811 | if (id_tracker_p) { |
1812 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1813 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1814 | |
f934e302 | 1815 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1816 | if (iter++ >= *ppos) |
1817 | return e; | |
1818 | } | |
1819 | } | |
1820 | } else { | |
d1f652f8 | 1821 | /* ID tracker disabled. */ |
7e6f9ef6 | 1822 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1823 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1824 | iter++; |
1825 | } | |
1826 | ||
1827 | /* End of list */ | |
1828 | return NULL; | |
1829 | } | |
1830 | ||
1831 | static | |
d1f652f8 | 1832 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1833 | { |
1834 | mutex_unlock(&sessions_mutex); | |
1835 | } | |
1836 | ||
1837 | static | |
d1f652f8 | 1838 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1839 | { |
8c0393c3 MD |
1840 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1841 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1842 | int id; |
7e6f9ef6 | 1843 | |
d1f652f8 | 1844 | if (p == id_tracker_p) { |
7e6f9ef6 | 1845 | /* Tracker disabled. */ |
d1f652f8 | 1846 | id = -1; |
7e6f9ef6 | 1847 | } else { |
d1f652f8 | 1848 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1849 | |
d1f652f8 MD |
1850 | id = lttng_id_tracker_get_node_id(e); |
1851 | } | |
8c0393c3 | 1852 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1853 | case TRACKER_PID: |
1854 | seq_printf(m, "process { pid = %d; };\n", id); | |
1855 | break; | |
1856 | case TRACKER_VPID: | |
1857 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1858 | break; | |
1859 | case TRACKER_UID: | |
1860 | seq_printf(m, "user { uid = %d; };\n", id); | |
1861 | break; | |
1862 | case TRACKER_VUID: | |
1863 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1864 | break; | |
1865 | case TRACKER_GID: | |
1866 | seq_printf(m, "group { gid = %d; };\n", id); | |
1867 | break; | |
1868 | case TRACKER_VGID: | |
1869 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1870 | break; | |
1871 | default: | |
1872 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1873 | } |
7e6f9ef6 MD |
1874 | return 0; |
1875 | } | |
1876 | ||
1877 | static | |
d1f652f8 MD |
1878 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1879 | .start = id_list_start, | |
1880 | .next = id_list_next, | |
1881 | .stop = id_list_stop, | |
1882 | .show = id_list_show, | |
7e6f9ef6 MD |
1883 | }; |
1884 | ||
1885 | static | |
d1f652f8 | 1886 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1887 | { |
d1f652f8 | 1888 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1889 | } |
1890 | ||
1891 | static | |
d1f652f8 | 1892 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1893 | { |
1894 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1895 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1896 | int ret; |
1897 | ||
d1f652f8 | 1898 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1899 | ret = seq_release(inode, file); |
d1f652f8 | 1900 | if (!ret) |
8c0393c3 | 1901 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1902 | return ret; |
1903 | } | |
1904 | ||
d1f652f8 | 1905 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1906 | .owner = THIS_MODULE, |
d1f652f8 | 1907 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1908 | .read = seq_read, |
1909 | .llseek = seq_lseek, | |
d1f652f8 | 1910 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1911 | }; |
1912 | ||
8cdc1a81 | 1913 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1914 | enum tracker_type tracker_type) |
7e6f9ef6 | 1915 | { |
d1f652f8 | 1916 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1917 | struct seq_file *m; |
1918 | int file_fd, ret; | |
1919 | ||
1920 | file_fd = lttng_get_unused_fd(); | |
1921 | if (file_fd < 0) { | |
1922 | ret = file_fd; | |
1923 | goto fd_error; | |
1924 | } | |
1925 | ||
d1f652f8 MD |
1926 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1927 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1928 | NULL, O_RDWR); |
d1f652f8 MD |
1929 | if (IS_ERR(tracker_ids_list_file)) { |
1930 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1931 | goto file_error; |
1932 | } | |
8cdc1a81 | 1933 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1934 | ret = -EOVERFLOW; |
9c1f4643 MD |
1935 | goto refcount_error; |
1936 | } | |
d1f652f8 | 1937 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1938 | if (ret < 0) |
1939 | goto open_error; | |
d1f652f8 MD |
1940 | m = tracker_ids_list_file->private_data; |
1941 | ||
1942 | m->private = get_tracker(session, tracker_type); | |
1943 | BUG_ON(!m->private); | |
1944 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1945 | |
1946 | return file_fd; | |
1947 | ||
1948 | open_error: | |
8cdc1a81 | 1949 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1950 | refcount_error: |
d1f652f8 | 1951 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1952 | file_error: |
1953 | put_unused_fd(file_fd); | |
1954 | fd_error: | |
1955 | return ret; | |
1956 | } | |
1957 | ||
3c997079 MD |
1958 | /* |
1959 | * Enabler management. | |
1960 | */ | |
1961 | static | |
4993071a PP |
1962 | int lttng_match_enabler_star_glob(const char *desc_name, |
1963 | const char *pattern) | |
3c997079 | 1964 | { |
cbc19040 MD |
1965 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1966 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1967 | return 0; |
1968 | return 1; | |
1969 | } | |
1970 | ||
1971 | static | |
4ecb5ad5 MD |
1972 | int lttng_match_enabler_name(const char *desc_name, |
1973 | const char *name) | |
3c997079 | 1974 | { |
4ecb5ad5 | 1975 | if (strcmp(desc_name, name)) |
3c997079 MD |
1976 | return 0; |
1977 | return 1; | |
1978 | } | |
1979 | ||
437d5aa5 | 1980 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
8d554755 | 1981 | struct lttng_event_enabler_common *enabler) |
3c997079 | 1982 | { |
4ecb5ad5 | 1983 | const char *desc_name, *enabler_name; |
badfe9f5 | 1984 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1985 | |
1986 | enabler_name = enabler->event_param.name; | |
1987 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1988 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1989 | desc_name = desc->event_name; |
3b861b22 FD |
1990 | switch (enabler->format_type) { |
1991 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1992 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1993 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1994 | return lttng_match_enabler_name(desc_name, enabler_name); |
1995 | default: | |
1996 | return -EINVAL; | |
1997 | } | |
4ecb5ad5 | 1998 | break; |
b4a75708 | 1999 | |
606828e4 | 2000 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 2001 | desc_name = desc->event_name; |
badfe9f5 | 2002 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 2003 | desc_name += strlen("compat_"); |
badfe9f5 MD |
2004 | compat = true; |
2005 | } | |
4ecb5ad5 MD |
2006 | if (!strncmp(desc_name, "syscall_exit_", |
2007 | strlen("syscall_exit_"))) { | |
2008 | desc_name += strlen("syscall_exit_"); | |
2009 | } else if (!strncmp(desc_name, "syscall_entry_", | |
2010 | strlen("syscall_entry_"))) { | |
2011 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 2012 | entry = true; |
4ecb5ad5 MD |
2013 | } else { |
2014 | WARN_ON_ONCE(1); | |
2015 | return -EINVAL; | |
2016 | } | |
badfe9f5 | 2017 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 2018 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 2019 | break; |
606828e4 | 2020 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
2021 | if (!entry) |
2022 | return 0; | |
2023 | break; | |
606828e4 | 2024 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
2025 | if (entry) |
2026 | return 0; | |
2027 | break; | |
2028 | default: | |
2029 | return -EINVAL; | |
2030 | } | |
2031 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 2032 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 2033 | break; |
606828e4 | 2034 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
2035 | if (compat) |
2036 | return 0; | |
2037 | break; | |
606828e4 | 2038 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
2039 | if (!compat) |
2040 | return 0; | |
2041 | break; | |
2042 | default: | |
2043 | return -EINVAL; | |
2044 | } | |
2045 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2046 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2047 | switch (enabler->format_type) { |
2048 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2049 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2050 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2051 | return lttng_match_enabler_name(desc_name, enabler_name); |
2052 | default: | |
2053 | return -EINVAL; | |
2054 | } | |
2055 | break; | |
606828e4 | 2056 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2057 | return -EINVAL; /* Not implemented. */ |
2058 | default: | |
2059 | return -EINVAL; | |
2060 | } | |
4ecb5ad5 | 2061 | break; |
b4a75708 | 2062 | |
4ecb5ad5 MD |
2063 | default: |
2064 | WARN_ON_ONCE(1); | |
2065 | return -EINVAL; | |
2066 | } | |
3c997079 MD |
2067 | } |
2068 | ||
2069 | static | |
b2bc0bc8 | 2070 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
a67ba386 | 2071 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2072 | { |
8d554755 | 2073 | struct lttng_event_enabler_common *base_enabler = lttng_event_enabler_as_enabler( |
b2bc0bc8 FD |
2074 | event_enabler); |
2075 | ||
a67ba386 | 2076 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2077 | return 0; |
a67ba386 MD |
2078 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2079 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2080 | return 1; |
2081 | else | |
2082 | return 0; | |
2083 | } | |
2084 | ||
b01155ba FD |
2085 | static |
2086 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2087 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba | 2088 | { |
8d554755 | 2089 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler( |
b01155ba FD |
2090 | event_notifier_enabler); |
2091 | ||
a67ba386 | 2092 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2093 | return 0; |
a67ba386 MD |
2094 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2095 | && event_notifier->priv->group == event_notifier_enabler->group | |
2096 | && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2097 | return 1; |
2098 | else | |
2099 | return 0; | |
2100 | } | |
2101 | ||
3c997079 | 2102 | static |
b2bc0bc8 FD |
2103 | struct lttng_enabler_ref *lttng_enabler_ref( |
2104 | struct list_head *enablers_ref_list, | |
8d554755 | 2105 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2106 | { |
2107 | struct lttng_enabler_ref *enabler_ref; | |
2108 | ||
b2bc0bc8 | 2109 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2110 | if (enabler_ref->ref == enabler) |
2111 | return enabler_ref; | |
2112 | } | |
2113 | return NULL; | |
2114 | } | |
2115 | ||
3c997079 | 2116 | static |
1b917d6b | 2117 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2118 | { |
f7d06400 | 2119 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; |
437d5aa5 MD |
2120 | struct lttng_kernel_probe_desc *probe_desc; |
2121 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2122 | int i; |
2123 | struct list_head *probe_list; | |
2124 | ||
2125 | probe_list = lttng_get_probe_list_head(); | |
2126 | /* | |
2127 | * For each probe event, if we find that a probe event matches | |
2128 | * our enabler, create an associated lttng_event if not | |
2129 | * already present. | |
2130 | */ | |
2131 | list_for_each_entry(probe_desc, probe_list, head) { | |
2132 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2133 | int found = 0; | |
2134 | struct hlist_head *head; | |
a67ba386 MD |
2135 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2136 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2137 | |
2138 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2139 | if (!lttng_desc_match_enabler(desc, |
2140 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2141 | continue; |
3c997079 MD |
2142 | |
2143 | /* | |
2144 | * Check if already created. | |
2145 | */ | |
4a11ef1c | 2146 | head = utils_borrow_hash_table_bucket( |
8cdc1a81 | 2147 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 2148 | desc->event_name); |
a67ba386 MD |
2149 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2150 | if (event_recorder_private->parent.desc == desc | |
2151 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2152 | found = 1; |
2153 | } | |
2154 | if (found) | |
2155 | continue; | |
2156 | ||
2157 | /* | |
2158 | * We need to create an event for this | |
2159 | * event probe. | |
2160 | */ | |
def1e304 | 2161 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); |
a67ba386 | 2162 | if (!event_recorder) { |
5a15f70c | 2163 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2164 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2165 | } |
2166 | } | |
2167 | } | |
2168 | } | |
2169 | ||
b01155ba FD |
2170 | static |
2171 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2172 | { | |
2173 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2174 | struct lttng_kernel_probe_desc *probe_desc; |
2175 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2176 | int i; |
2177 | struct list_head *probe_list; | |
2178 | ||
2179 | probe_list = lttng_get_probe_list_head(); | |
2180 | /* | |
2181 | * For each probe event, if we find that a probe event matches | |
2182 | * our enabler, create an associated lttng_event_notifier if not | |
2183 | * already present. | |
2184 | */ | |
2185 | list_for_each_entry(probe_desc, probe_list, head) { | |
2186 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2187 | int found = 0; | |
2188 | struct hlist_head *head; | |
a67ba386 MD |
2189 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2190 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2191 | |
2192 | desc = probe_desc->event_desc[i]; | |
2193 | if (!lttng_desc_match_enabler(desc, | |
2194 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2195 | continue; | |
2196 | ||
2197 | /* | |
2198 | * Check if already created. | |
2199 | */ | |
2200 | head = utils_borrow_hash_table_bucket( | |
2201 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2202 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2203 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2204 | if (event_notifier_priv->parent.desc == desc | |
2205 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2206 | found = 1; |
2207 | } | |
2208 | if (found) | |
2209 | continue; | |
2210 | ||
2211 | /* | |
2212 | * We need to create a event_notifier for this event probe. | |
2213 | */ | |
2214 | event_notifier = _lttng_event_notifier_create(desc, | |
2215 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2216 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2217 | event_notifier_group, NULL, |
606828e4 | 2218 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2219 | if (IS_ERR(event_notifier)) { |
2220 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2221 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2222 | } |
2223 | } | |
2224 | } | |
2225 | } | |
2226 | ||
33a39a3c | 2227 | static |
1b917d6b | 2228 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2229 | { |
2230 | int ret; | |
2231 | ||
a67ba386 | 2232 | ret = lttng_syscalls_register_event(event_enabler); |
33a39a3c MD |
2233 | WARN_ON_ONCE(ret); |
2234 | } | |
2235 | ||
8a8ac9a8 FD |
2236 | static |
2237 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2238 | { | |
2239 | int ret; | |
2240 | ||
a67ba386 | 2241 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler); |
8a8ac9a8 | 2242 | WARN_ON_ONCE(ret); |
a67ba386 | 2243 | ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler); |
8a8ac9a8 FD |
2244 | WARN_ON_ONCE(ret); |
2245 | } | |
2246 | ||
33a39a3c | 2247 | /* |
a67ba386 | 2248 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2249 | * tracepoint probes. |
2250 | * Should be called with sessions mutex held. | |
2251 | */ | |
2252 | static | |
b2bc0bc8 | 2253 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2254 | { |
b2bc0bc8 | 2255 | switch (event_enabler->base.event_param.instrumentation) { |
606828e4 | 2256 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2257 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2258 | break; |
b4a75708 | 2259 | |
606828e4 | 2260 | case LTTNG_KERNEL_ABI_SYSCALL: |
1b917d6b | 2261 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2262 | break; |
b4a75708 | 2263 | |
33a39a3c MD |
2264 | default: |
2265 | WARN_ON_ONCE(1); | |
2266 | break; | |
2267 | } | |
2268 | } | |
2269 | ||
3c997079 | 2270 | /* |
b2bc0bc8 | 2271 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2272 | * and add backward reference from the event to the enabler. |
2273 | * Should be called with sessions mutex held. | |
2274 | */ | |
2275 | static | |
b2bc0bc8 | 2276 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2277 | { |
f7d06400 MD |
2278 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
2279 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; | |
8d554755 | 2280 | struct lttng_event_enabler_common *base_enabler = lttng_event_enabler_as_enabler(event_enabler); |
a67ba386 | 2281 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2282 | |
606828e4 MD |
2283 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2284 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2285 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2286 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2287 | int enabled = base_enabler->enabled; |
606828e4 | 2288 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2289 | |
606828e4 | 2290 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
f7d06400 | 2291 | WRITE_ONCE(chan->priv->parent.syscall_all_entry, enabled); |
3b82c4e1 | 2292 | |
606828e4 | 2293 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
f7d06400 | 2294 | WRITE_ONCE(chan->priv->parent.syscall_all_exit, enabled); |
badfe9f5 MD |
2295 | } |
2296 | ||
3c997079 | 2297 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2298 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2299 | |
b2bc0bc8 | 2300 | /* For each event matching event_enabler in session event list. */ |
8cdc1a81 | 2301 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2302 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2303 | struct lttng_enabler_ref *enabler_ref; |
2304 | ||
a67ba386 | 2305 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2306 | continue; |
a67ba386 | 2307 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
b2bc0bc8 | 2308 | lttng_event_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2309 | if (!enabler_ref) { |
2310 | /* | |
2311 | * If no backward ref, create it. | |
b2bc0bc8 | 2312 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2313 | */ |
2314 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2315 | if (!enabler_ref) | |
2316 | return -ENOMEM; | |
b2bc0bc8 | 2317 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 | 2318 | list_add(&enabler_ref->node, |
a67ba386 | 2319 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2320 | } |
2321 | ||
f127e61e MD |
2322 | /* |
2323 | * Link filter bytecodes if not linked yet. | |
2324 | */ | |
a67ba386 | 2325 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2326 | lttng_static_ctx, |
a67ba386 | 2327 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
60206944 | 2328 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2329 | } |
2330 | return 0; | |
2331 | } | |
2332 | ||
b01155ba | 2333 | /* |
a67ba386 | 2334 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2335 | * tracepoint probes. |
2336 | * Should be called with sessions mutex held. | |
2337 | */ | |
2338 | static | |
2339 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2340 | { | |
2341 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
606828e4 | 2342 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2343 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2344 | break; | |
b4a75708 | 2345 | |
606828e4 | 2346 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
2347 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); |
2348 | break; | |
b4a75708 | 2349 | |
b01155ba FD |
2350 | default: |
2351 | WARN_ON_ONCE(1); | |
2352 | break; | |
2353 | } | |
2354 | } | |
2355 | ||
2356 | /* | |
2357 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2358 | */ | |
2359 | static | |
8a8ac9a8 FD |
2360 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2361 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2362 | { |
2363 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8d554755 | 2364 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2365 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2366 | |
606828e4 MD |
2367 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2368 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2369 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2370 | !strcmp(base_enabler->event_param.name, "*")) { |
2371 | ||
2372 | int enabled = base_enabler->enabled; | |
606828e4 | 2373 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2374 | |
606828e4 | 2375 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2376 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); |
2377 | ||
606828e4 | 2378 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2379 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); |
2380 | ||
2381 | } | |
2382 | ||
b01155ba FD |
2383 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2384 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2385 | ||
2386 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2387 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2388 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2389 | struct lttng_enabler_ref *enabler_ref; |
2390 | ||
2391 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2392 | continue; | |
2393 | ||
a67ba386 | 2394 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2395 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2396 | if (!enabler_ref) { | |
2397 | /* | |
2398 | * If no backward ref, create it. | |
2399 | * Add backward ref from event_notifier to enabler. | |
2400 | */ | |
2401 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2402 | if (!enabler_ref) | |
2403 | return -ENOMEM; | |
2404 | ||
2405 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2406 | event_notifier_enabler); | |
2407 | list_add(&enabler_ref->node, | |
a67ba386 | 2408 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2409 | } |
2410 | ||
2411 | /* | |
2412 | * Link filter bytecodes if not linked yet. | |
2413 | */ | |
a67ba386 MD |
2414 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2415 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2416 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2417 | |
2418 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2419 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2420 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2421 | &event_notifier_enabler->capture_bytecode_head); |
2422 | ||
a67ba386 | 2423 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2424 | } |
2425 | return 0; | |
2426 | } | |
2427 | ||
3c997079 MD |
2428 | /* |
2429 | * Called at module load: connect the probe on all enablers matching | |
2430 | * this event. | |
2431 | * Called with sessions lock held. | |
2432 | */ | |
2433 | int lttng_fix_pending_events(void) | |
2434 | { | |
8cdc1a81 | 2435 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2436 | |
8cdc1a81 MD |
2437 | list_for_each_entry(session_priv, &sessions, list) |
2438 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2439 | return 0; |
2440 | } | |
2441 | ||
b01155ba FD |
2442 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2443 | struct lttng_event_notifier_group *event_notifier_group) | |
2444 | { | |
2445 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2446 | ||
2447 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2448 | node) { | |
2449 | if (event_notifier_enabler->base.enabled) | |
2450 | return true; | |
2451 | } | |
2452 | return false; | |
2453 | } | |
2454 | ||
2455 | bool lttng_event_notifier_active(void) | |
2456 | { | |
2457 | struct lttng_event_notifier_group *event_notifier_group; | |
2458 | ||
2459 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2460 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2461 | return true; | |
2462 | } | |
2463 | return false; | |
2464 | } | |
2465 | ||
2466 | int lttng_fix_pending_event_notifiers(void) | |
2467 | { | |
2468 | struct lttng_event_notifier_group *event_notifier_group; | |
2469 | ||
2470 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2471 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2472 | return 0; | |
2473 | } | |
2474 | ||
b2bc0bc8 FD |
2475 | struct lttng_event_enabler *lttng_event_enabler_create( |
2476 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2477 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2478 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2479 | { |
b2bc0bc8 | 2480 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2481 | |
b2bc0bc8 FD |
2482 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2483 | if (!event_enabler) | |
3c997079 | 2484 | return NULL; |
b2bc0bc8 FD |
2485 | event_enabler->base.format_type = format_type; |
2486 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2487 | memcpy(&event_enabler->base.event_param, event_param, | |
2488 | sizeof(event_enabler->base.event_param)); | |
2489 | event_enabler->chan = chan; | |
3c997079 | 2490 | /* ctx left NULL */ |
b2bc0bc8 | 2491 | event_enabler->base.enabled = 0; |
def1e304 MD |
2492 | return event_enabler; |
2493 | } | |
2494 | ||
2495 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
2496 | struct lttng_event_enabler *event_enabler) | |
2497 | { | |
3c997079 | 2498 | mutex_lock(&sessions_mutex); |
def1e304 MD |
2499 | list_add(&event_enabler->node, &session->priv->enablers_head); |
2500 | event_enabler->published = true; | |
2501 | lttng_session_lazy_sync_event_enablers(session); | |
3c997079 | 2502 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2503 | } |
2504 | ||
b2bc0bc8 | 2505 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2506 | { |
2507 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2508 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
f7d06400 | 2509 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2510 | mutex_unlock(&sessions_mutex); |
2511 | return 0; | |
2512 | } | |
2513 | ||
b2bc0bc8 | 2514 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2515 | { |
2516 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2517 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
f7d06400 | 2518 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2519 | mutex_unlock(&sessions_mutex); |
2520 | return 0; | |
2521 | } | |
2522 | ||
b2bc0bc8 | 2523 | static |
8d554755 | 2524 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2525 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2526 | { |
d64ca521 | 2527 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2528 | uint32_t bytecode_len; |
2529 | int ret; | |
2530 | ||
2531 | ret = get_user(bytecode_len, &bytecode->len); | |
2532 | if (ret) | |
2533 | return ret; | |
52cfcdf3 | 2534 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2535 | GFP_KERNEL); |
2536 | if (!bytecode_node) | |
2537 | return -ENOMEM; | |
2538 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2539 | sizeof(*bytecode) + bytecode_len); | |
2540 | if (ret) | |
2541 | goto error_free; | |
b2bc0bc8 | 2542 | |
8a445457 | 2543 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2544 | bytecode_node->enabler = enabler; |
2545 | /* Enforce length based on allocated size */ | |
2546 | bytecode_node->bc.len = bytecode_len; | |
2547 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2548 | |
07dfc1d0 MD |
2549 | return 0; |
2550 | ||
2551 | error_free: | |
52cfcdf3 | 2552 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2553 | return ret; |
2554 | } | |
2555 | ||
183e8b3a | 2556 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
606828e4 | 2557 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2558 | { |
2559 | int ret; | |
183e8b3a | 2560 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2561 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2562 | if (ret) | |
2563 | goto error; | |
2564 | ||
f7d06400 | 2565 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
b2bc0bc8 FD |
2566 | return 0; |
2567 | ||
2568 | error: | |
2569 | return ret; | |
2570 | } | |
2571 | ||
e2d5dbc7 | 2572 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2573 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2574 | { |
2575 | ||
e2d5dbc7 | 2576 | switch (event->priv->instrumentation) { |
606828e4 | 2577 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2578 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2579 | default: |
2580 | return -EINVAL; | |
2581 | } | |
2582 | } | |
2583 | ||
3c997079 | 2584 | static |
8d554755 | 2585 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2586 | { |
d64ca521 | 2587 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2588 | |
2589 | /* Destroy filter bytecode */ | |
2590 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2591 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2592 | lttng_kvfree(filter_node); |
07dfc1d0 | 2593 | } |
b2bc0bc8 FD |
2594 | } |
2595 | ||
b2bc0bc8 FD |
2596 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
2597 | { | |
2598 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2599 | |
def1e304 MD |
2600 | if (event_enabler->published) |
2601 | list_del(&event_enabler->node); | |
b2bc0bc8 | 2602 | kfree(event_enabler); |
3c997079 MD |
2603 | } |
2604 | ||
dffef45d FD |
2605 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2606 | struct lttng_event_notifier_group *event_notifier_group, | |
2607 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2608 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2609 | { |
2610 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2611 | ||
2612 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2613 | if (!event_notifier_enabler) | |
2614 | return NULL; | |
2615 | ||
2616 | event_notifier_enabler->base.format_type = format_type; | |
2617 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2618 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2619 | ||
99f52fcc | 2620 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2621 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2622 | |
8a8ac9a8 FD |
2623 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2624 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2625 | |
2626 | event_notifier_enabler->base.enabled = 0; | |
2627 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2628 | event_notifier_enabler->group = event_notifier_group; | |
2629 | ||
2630 | mutex_lock(&sessions_mutex); | |
2631 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2632 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2633 | |
2634 | mutex_unlock(&sessions_mutex); | |
2635 | ||
2636 | return event_notifier_enabler; | |
2637 | } | |
2638 | ||
2639 | int lttng_event_notifier_enabler_enable( | |
2640 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2641 | { | |
2642 | mutex_lock(&sessions_mutex); | |
2643 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2644 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2645 | mutex_unlock(&sessions_mutex); |
2646 | return 0; | |
2647 | } | |
2648 | ||
2649 | int lttng_event_notifier_enabler_disable( | |
2650 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2651 | { | |
2652 | mutex_lock(&sessions_mutex); | |
2653 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2654 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2655 | mutex_unlock(&sessions_mutex); |
2656 | return 0; | |
2657 | } | |
2658 | ||
183e8b3a | 2659 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d | 2660 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
606828e4 | 2661 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
dffef45d FD |
2662 | { |
2663 | int ret; | |
2664 | ||
183e8b3a | 2665 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2666 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2667 | bytecode); | |
2668 | if (ret) | |
2669 | goto error; | |
2670 | ||
b01155ba | 2671 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2672 | return 0; |
2673 | ||
2674 | error: | |
2675 | return ret; | |
2676 | } | |
2677 | ||
99d223ad FD |
2678 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2679 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2680 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2681 | { |
d64ca521 | 2682 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2683 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2684 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2685 | uint32_t bytecode_len; | |
2686 | int ret; | |
2687 | ||
2688 | ret = get_user(bytecode_len, &bytecode->len); | |
2689 | if (ret) | |
2690 | return ret; | |
2691 | ||
2692 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2693 | GFP_KERNEL); | |
2694 | if (!bytecode_node) | |
2695 | return -ENOMEM; | |
2696 | ||
2697 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2698 | sizeof(*bytecode) + bytecode_len); | |
2699 | if (ret) | |
2700 | goto error_free; | |
2701 | ||
8a445457 | 2702 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2703 | bytecode_node->enabler = enabler; |
2704 | ||
2705 | /* Enforce length based on allocated size */ | |
2706 | bytecode_node->bc.len = bytecode_len; | |
2707 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2708 | ||
2709 | event_notifier_enabler->num_captures++; | |
2710 | ||
2711 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2712 | goto end; | |
2713 | ||
2714 | error_free: | |
2715 | lttng_kvfree(bytecode_node); | |
2716 | end: | |
2717 | return ret; | |
2718 | } | |
2719 | ||
dffef45d FD |
2720 | static |
2721 | void lttng_event_notifier_enabler_destroy( | |
2722 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2723 | { | |
2724 | if (!event_notifier_enabler) { | |
2725 | return; | |
2726 | } | |
2727 | ||
2728 | list_del(&event_notifier_enabler->node); | |
2729 | ||
2730 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2731 | kfree(event_notifier_enabler); | |
2732 | } | |
2733 | ||
3c997079 | 2734 | /* |
b2bc0bc8 | 2735 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2736 | * session. |
2737 | * Should be called with sessions mutex held. | |
2738 | */ | |
2739 | static | |
8cdc1a81 | 2740 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2741 | { |
b2bc0bc8 | 2742 | struct lttng_event_enabler *event_enabler; |
a67ba386 | 2743 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2744 | |
8cdc1a81 | 2745 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2746 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2747 | /* |
2748 | * For each event, if at least one of its enablers is enabled, | |
2749 | * and its channel and session transient states are enabled, we | |
2750 | * enable the event, else we disable it. | |
2751 | */ | |
8cdc1a81 | 2752 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2753 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2754 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2755 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2756 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2757 | int nr_filters = 0; | |
3c997079 | 2758 | |
a67ba386 | 2759 | switch (event_recorder_priv->parent.instrumentation) { |
c190d76e MJ |
2760 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2761 | lttng_fallthrough; | |
606828e4 | 2762 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
2763 | /* Enable events */ |
2764 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2765 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2766 | if (enabler_ref->ref->enabled) { |
2767 | enabled = 1; | |
2768 | break; | |
2769 | } | |
2770 | } | |
4ecb5ad5 | 2771 | break; |
b4a75708 | 2772 | |
4ecb5ad5 | 2773 | default: |
3c997079 MD |
2774 | /* Not handled with lazy sync. */ |
2775 | continue; | |
2776 | } | |
2777 | /* | |
2778 | * Enabled state is based on union of enablers, with | |
2779 | * intesection of session and channel transient enable | |
2780 | * states. | |
2781 | */ | |
f7d06400 | 2782 | enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; |
3c997079 | 2783 | |
a67ba386 | 2784 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2785 | /* |
2786 | * Sync tracepoint registration with event enabled | |
2787 | * state. | |
2788 | */ | |
2789 | if (enabled) { | |
a67ba386 | 2790 | register_event(event_recorder); |
3c997079 | 2791 | } else { |
a67ba386 | 2792 | _lttng_event_unregister(event_recorder); |
3c997079 | 2793 | } |
07dfc1d0 MD |
2794 | |
2795 | /* Check if has enablers without bytecode enabled */ | |
2796 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2797 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2798 | if (enabler_ref->ref->enabled |
2799 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2800 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2801 | break; |
2802 | } | |
2803 | } | |
a67ba386 | 2804 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2805 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2806 | |
2807 | /* Enable filters */ | |
2808 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2809 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2810 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2811 | nr_filters++; |
2812 | } | |
2813 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2814 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2815 | } |
2816 | } | |
2817 | ||
2818 | /* | |
2819 | * Apply enablers to session events, adding events to session if need | |
2820 | * be. It is required after each modification applied to an active | |
2821 | * session, and right before session "start". | |
2822 | * "lazy" sync means we only sync if required. | |
2823 | * Should be called with sessions mutex held. | |
2824 | */ | |
2825 | static | |
8cdc1a81 | 2826 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2827 | { |
2828 | /* We can skip if session is not active */ | |
2829 | if (!session->active) | |
2830 | return; | |
b2bc0bc8 | 2831 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2832 | } |
2833 | ||
b01155ba FD |
2834 | static |
2835 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2836 | { | |
2837 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2838 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2839 | |
2840 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2841 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2842 | ||
2843 | /* | |
2844 | * For each event_notifier, if at least one of its enablers is enabled, | |
2845 | * we enable the event_notifier, else we disable it. | |
2846 | */ | |
a67ba386 MD |
2847 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2848 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2849 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2850 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2851 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2852 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2853 | |
a67ba386 | 2854 | switch (event_notifier_priv->parent.instrumentation) { |
c190d76e MJ |
2855 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2856 | lttng_fallthrough; | |
606828e4 | 2857 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
2858 | /* Enable event_notifiers */ |
2859 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2860 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2861 | if (enabler_ref->ref->enabled) { |
2862 | enabled = 1; | |
2863 | break; | |
2864 | } | |
2865 | } | |
2866 | break; | |
b4a75708 | 2867 | |
b01155ba FD |
2868 | default: |
2869 | /* Not handled with sync. */ | |
2870 | continue; | |
2871 | } | |
2872 | ||
a67ba386 | 2873 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2874 | /* |
2875 | * Sync tracepoint registration with event_notifier enabled | |
2876 | * state. | |
2877 | */ | |
2878 | if (enabled) { | |
a67ba386 | 2879 | if (!event_notifier_priv->parent.registered) |
b01155ba FD |
2880 | register_event_notifier(event_notifier); |
2881 | } else { | |
a67ba386 | 2882 | if (event_notifier_priv->parent.registered) |
b01155ba FD |
2883 | _lttng_event_notifier_unregister(event_notifier); |
2884 | } | |
2885 | ||
2886 | /* Check if has enablers without bytecode enabled */ | |
2887 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2888 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2889 | if (enabler_ref->ref->enabled |
2890 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2891 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2892 | break; |
2893 | } | |
2894 | } | |
a67ba386 | 2895 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2896 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2897 | |
2898 | /* Enable filters */ | |
2899 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2900 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2901 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2902 | nr_filters++; |
2903 | } | |
2904 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2905 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2906 | |
2907 | /* Enable captures */ | |
2908 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2909 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2910 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2911 | nr_captures++; |
2912 | } | |
2913 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2914 | } |
2915 | } | |
2916 | ||
1ec3f75a | 2917 | /* |
d83004aa JD |
2918 | * Serialize at most one packet worth of metadata into a metadata |
2919 | * channel. | |
92d9f5e6 MD |
2920 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2921 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2922 | * allows us to do racy operations such as looking for remaining space left in | |
2923 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2924 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2925 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2926 | * Returns the number of bytes written in the channel, 0 if no data |
2927 | * was written and a negative value on error. | |
1ec3f75a | 2928 | */ |
b3b8072b | 2929 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2930 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2931 | { |
8a57ec02 | 2932 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2933 | int ret = 0; |
2934 | size_t len, reserve_len; | |
2935 | ||
f613e3e6 | 2936 | /* |
92d9f5e6 MD |
2937 | * Ensure we support mutiple get_next / put sequences followed by |
2938 | * put_next. The metadata cache lock protects reading the metadata | |
2939 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2940 | * "flush" operations on the buffer invoked by different processes. | |
2941 | * Moreover, since the metadata cache memory can be reallocated, we | |
2942 | * need to have exclusive access against updates even though we only | |
2943 | * read it. | |
f613e3e6 | 2944 | */ |
92d9f5e6 | 2945 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2946 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2947 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2948 | goto end; |
f613e3e6 | 2949 | |
9616f0bf JD |
2950 | /* Metadata regenerated, change the version. */ |
2951 | if (stream->metadata_cache->version != stream->version) | |
2952 | stream->version = stream->metadata_cache->version; | |
2953 | ||
d83004aa | 2954 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2955 | stream->metadata_in; |
9de2c215 | 2956 | if (!len) |
de23d59d | 2957 | goto end; |
d83004aa | 2958 | reserve_len = min_t(size_t, |
4a399b76 | 2959 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2960 | len); |
a775608d | 2961 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2962 | sizeof(char), NULL); |
d83004aa JD |
2963 | /* |
2964 | * If reservation failed, return an error to the caller. | |
2965 | */ | |
c2fb9c1c | 2966 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2967 | if (ret != 0) { |
2968 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2969 | stream->coherent = false; |
d83004aa JD |
2970 | goto end; |
2971 | } | |
b3b8072b | 2972 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2973 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2974 | reserve_len, 1); |
b3b8072b | 2975 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2976 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2977 | if (reserve_len < len) |
8b97fd42 MD |
2978 | stream->coherent = false; |
2979 | else | |
2980 | stream->coherent = true; | |
d83004aa JD |
2981 | ret = reserve_len; |
2982 | ||
2983 | end: | |
8b97fd42 MD |
2984 | if (coherent) |
2985 | *coherent = stream->coherent; | |
92d9f5e6 | 2986 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2987 | return ret; |
2988 | } | |
2989 | ||
8b97fd42 | 2990 | static |
8cdc1a81 | 2991 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2992 | { |
8cdc1a81 MD |
2993 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2994 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2995 | } |
2996 | ||
2997 | static | |
8cdc1a81 | 2998 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2999 | { |
8cdc1a81 MD |
3000 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3001 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
3002 | struct lttng_metadata_stream *stream; |
3003 | ||
8cdc1a81 | 3004 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 3005 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 3006 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 3007 | } |
8b97fd42 MD |
3008 | } |
3009 | ||
d83004aa JD |
3010 | /* |
3011 | * Write the metadata to the metadata cache. | |
3012 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
3013 | * The metadata cache lock protects us from concurrent read access from |
3014 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
3015 | * The content of the printf is printed as a single atomic metadata |
3016 | * transaction. | |
d83004aa | 3017 | */ |
8cdc1a81 | 3018 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
3019 | const char *fmt, ...) |
3020 | { | |
c099397a | 3021 | char *str; |
d83004aa | 3022 | size_t len; |
c099397a MD |
3023 | va_list ap; |
3024 | ||
585e5dcc | 3025 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
3026 | |
3027 | va_start(ap, fmt); | |
3028 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
3029 | va_end(ap); | |
3030 | if (!str) | |
3031 | return -ENOMEM; | |
3032 | ||
1ec3f75a | 3033 | len = strlen(str); |
8cdc1a81 MD |
3034 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3035 | if (session->priv->metadata_cache->metadata_written + len > | |
3036 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
3037 | char *tmp_cache_realloc; |
3038 | unsigned int tmp_cache_alloc_size; | |
3039 | ||
3040 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
3041 | session->priv->metadata_cache->cache_alloc + len, |
3042 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 3043 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
3044 | if (!tmp_cache_realloc) |
3045 | goto err; | |
8cdc1a81 | 3046 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 3047 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
3048 | session->priv->metadata_cache->data, |
3049 | session->priv->metadata_cache->cache_alloc); | |
3050 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
3051 | } |
3052 | ||
8cdc1a81 MD |
3053 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3054 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3055 | } |
8cdc1a81 MD |
3056 | memcpy(session->priv->metadata_cache->data + |
3057 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3058 | str, len); |
8cdc1a81 | 3059 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3060 | kfree(str); |
d83004aa | 3061 | |
d83004aa JD |
3062 | return 0; |
3063 | ||
3064 | err: | |
3065 | kfree(str); | |
3066 | return -ENOMEM; | |
c099397a MD |
3067 | } |
3068 | ||
f513b2bf | 3069 | static |
8cdc1a81 | 3070 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3071 | { |
3072 | size_t i; | |
3073 | ||
3074 | for (i = 0; i < nesting; i++) { | |
3075 | int ret; | |
3076 | ||
3077 | ret = lttng_metadata_printf(session, " "); | |
3078 | if (ret) { | |
3079 | return ret; | |
3080 | } | |
3081 | } | |
3082 | return 0; | |
3083 | } | |
3084 | ||
ceabb767 | 3085 | static |
8cdc1a81 | 3086 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3087 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3088 | size_t nesting) |
3089 | { | |
3090 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3091 | } | |
3092 | ||
3093 | static | |
8cdc1a81 | 3094 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3095 | const struct lttng_kernel_type_integer *type, |
3096 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3097 | size_t nesting) |
3098 | { | |
3099 | int ret; | |
3100 | ||
ceabb767 MD |
3101 | ret = print_tabs(session, nesting); |
3102 | if (ret) | |
3103 | return ret; | |
3104 | ret = lttng_metadata_printf(session, | |
3105 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3106 | type->size, |
3107 | type->alignment, | |
3108 | type->signedness, | |
3109 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3110 | ? "none" |
437d5aa5 | 3111 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3112 | ? "UTF8" |
3113 | : "ASCII", | |
437d5aa5 | 3114 | type->base, |
ceabb767 | 3115 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3116 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3117 | #else |
437d5aa5 | 3118 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3119 | #endif |
3120 | ); | |
3121 | return ret; | |
3122 | } | |
3123 | ||
f513b2bf MD |
3124 | /* |
3125 | * Must be called with sessions_mutex held. | |
3126 | */ | |
3127 | static | |
8cdc1a81 | 3128 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3129 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3130 | size_t nesting) |
3131 | { | |
51ef4536 | 3132 | const char *prev_field_name = NULL; |
f513b2bf MD |
3133 | int ret; |
3134 | uint32_t i, nr_fields; | |
ceabb767 MD |
3135 | unsigned int alignment; |
3136 | ||
f513b2bf MD |
3137 | ret = print_tabs(session, nesting); |
3138 | if (ret) | |
3139 | return ret; | |
3140 | ret = lttng_metadata_printf(session, | |
3141 | "struct {\n"); | |
3142 | if (ret) | |
3143 | return ret; | |
437d5aa5 | 3144 | nr_fields = type->nr_fields; |
f513b2bf | 3145 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3146 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3147 | |
437d5aa5 | 3148 | iter_field = type->fields[i]; |
51ef4536 | 3149 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3150 | if (ret) |
3151 | return ret; | |
3152 | } | |
3153 | ret = print_tabs(session, nesting); | |
3154 | if (ret) | |
3155 | return ret; | |
437d5aa5 | 3156 | alignment = type->alignment; |
ceabb767 MD |
3157 | if (alignment) { |
3158 | ret = lttng_metadata_printf(session, | |
3159 | "} align(%u)", | |
3160 | alignment); | |
3161 | } else { | |
3162 | ret = lttng_metadata_printf(session, | |
3163 | "}"); | |
3164 | } | |
f513b2bf MD |
3165 | return ret; |
3166 | } | |
3167 | ||
3168 | /* | |
3169 | * Must be called with sessions_mutex held. | |
3170 | */ | |
3171 | static | |
8cdc1a81 | 3172 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3173 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3174 | size_t nesting) |
3175 | { | |
3176 | int ret; | |
3177 | ||
3178 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3179 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3180 | if (ret) |
3181 | return ret; | |
ceabb767 | 3182 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3183 | } |
3184 | ||
65c85aa6 MD |
3185 | /* |
3186 | * Must be called with sessions_mutex held. | |
3187 | */ | |
3188 | static | |
8cdc1a81 | 3189 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3190 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3191 | size_t nesting, |
3192 | const char *prev_field_name) | |
65c85aa6 | 3193 | { |
51ef4536 | 3194 | const char *tag_name; |
65c85aa6 MD |
3195 | int ret; |
3196 | uint32_t i, nr_choices; | |
3197 | ||
51ef4536 MD |
3198 | tag_name = type->tag_name; |
3199 | if (!tag_name) | |
3200 | tag_name = prev_field_name; | |
3201 | if (!tag_name) | |
3202 | return -EINVAL; | |
ceabb767 MD |
3203 | /* |
3204 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3205 | */ | |
437d5aa5 | 3206 | if (type->alignment != 0) |
ceabb767 | 3207 | return -EINVAL; |
65c85aa6 MD |
3208 | ret = print_tabs(session, nesting); |
3209 | if (ret) | |
3210 | return ret; | |
3211 | ret = lttng_metadata_printf(session, | |
3212 | "variant <_%s> {\n", | |
51ef4536 | 3213 | tag_name); |
65c85aa6 MD |
3214 | if (ret) |
3215 | return ret; | |
437d5aa5 | 3216 | nr_choices = type->nr_choices; |
65c85aa6 | 3217 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3218 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3219 | |
437d5aa5 | 3220 | iter_field = type->choices[i]; |
51ef4536 | 3221 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3222 | if (ret) |
3223 | return ret; | |
3224 | } | |
3225 | ret = print_tabs(session, nesting); | |
3226 | if (ret) | |
3227 | return ret; | |
3228 | ret = lttng_metadata_printf(session, | |
3229 | "}"); | |
3230 | return ret; | |
3231 | } | |
3232 | ||
3233 | /* | |
3234 | * Must be called with sessions_mutex held. | |
3235 | */ | |
3236 | static | |
8cdc1a81 | 3237 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3238 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3239 | size_t nesting, |
3240 | const char *prev_field_name) | |
65c85aa6 MD |
3241 | { |
3242 | int ret; | |
3243 | ||
3244 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3245 | lttng_kernel_get_type_variant(field->type), nesting, |
3246 | prev_field_name); | |
65c85aa6 MD |
3247 | if (ret) |
3248 | return ret; | |
ceabb767 | 3249 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3250 | } |
3251 | ||
f513b2bf MD |
3252 | /* |
3253 | * Must be called with sessions_mutex held. | |
3254 | */ | |
3255 | static | |
8cdc1a81 | 3256 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3257 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3258 | size_t nesting) |
3259 | { | |
3260 | int ret; | |
437d5aa5 MD |
3261 | const struct lttng_kernel_type_array *array_type; |
3262 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3263 | |
437d5aa5 MD |
3264 | array_type = lttng_kernel_get_type_array(field->type); |
3265 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3266 | |
437d5aa5 | 3267 | if (array_type->alignment) { |
ceabb767 | 3268 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3269 | if (ret) |
3270 | return ret; | |
ceabb767 MD |
3271 | ret = lttng_metadata_printf(session, |
3272 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3273 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3274 | field->name); |
3275 | if (ret) | |
3276 | return ret; | |
3277 | } | |
3278 | /* | |
3279 | * Nested compound types: Only array of structures and variants are | |
3280 | * currently supported. | |
3281 | */ | |
437d5aa5 | 3282 | elem_type = array_type->elem_type; |
12bb2edb MD |
3283 | switch (elem_type->type) { |
3284 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3285 | case lttng_kernel_type_struct: |
3286 | case lttng_kernel_type_variant: | |
3287 | ret = _lttng_type_statedump(session, elem_type, | |
3288 | array_type->encoding, nesting); | |
65c85aa6 MD |
3289 | if (ret) |
3290 | return ret; | |
3291 | break; | |
ceabb767 | 3292 | |
f513b2bf MD |
3293 | default: |
3294 | return -EINVAL; | |
3295 | } | |
3296 | ret = lttng_metadata_printf(session, | |
3297 | " _%s[%u];\n", | |
3298 | field->name, | |
437d5aa5 | 3299 | array_type->length); |
f513b2bf MD |
3300 | return ret; |
3301 | } | |
3302 | ||
3303 | /* | |
3304 | * Must be called with sessions_mutex held. | |
3305 | */ | |
3306 | static | |
8cdc1a81 | 3307 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3308 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3309 | size_t nesting, |
3310 | const char *prev_field_name) | |
f513b2bf MD |
3311 | { |
3312 | int ret; | |
3313 | const char *length_name; | |
437d5aa5 MD |
3314 | const struct lttng_kernel_type_sequence *sequence_type; |
3315 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3316 | |
437d5aa5 MD |
3317 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3318 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3319 | |
437d5aa5 | 3320 | length_name = sequence_type->length_name; |
51ef4536 MD |
3321 | if (!length_name) |
3322 | length_name = prev_field_name; | |
3323 | if (!length_name) | |
3324 | return -EINVAL; | |
ceabb767 | 3325 | |
437d5aa5 | 3326 | if (sequence_type->alignment) { |
ceabb767 | 3327 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3328 | if (ret) |
3329 | return ret; | |
ceabb767 MD |
3330 | ret = lttng_metadata_printf(session, |
3331 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3332 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3333 | field->name); |
3334 | if (ret) | |
3335 | return ret; | |
3336 | } | |
3337 | ||
3338 | /* | |
3339 | * Nested compound types: Only array of structures and variants are | |
3340 | * currently supported. | |
3341 | */ | |
437d5aa5 | 3342 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3343 | switch (elem_type->type) { |
3344 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3345 | case lttng_kernel_type_struct: |
3346 | case lttng_kernel_type_variant: | |
3347 | ret = _lttng_type_statedump(session, elem_type, | |
3348 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3349 | if (ret) |
3350 | return ret; | |
3351 | break; | |
ceabb767 | 3352 | |
f513b2bf MD |
3353 | default: |
3354 | return -EINVAL; | |
3355 | } | |
3356 | ret = lttng_metadata_printf(session, | |
3357 | " _%s[ _%s ];\n", | |
3358 | field->name, | |
51ef4536 | 3359 | length_name); |
f513b2bf MD |
3360 | return ret; |
3361 | } | |
3362 | ||
141ddf28 MD |
3363 | /* |
3364 | * Must be called with sessions_mutex held. | |
3365 | */ | |
3366 | static | |
8cdc1a81 | 3367 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3368 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3369 | size_t nesting) |
3370 | { | |
d96a4a7a | 3371 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3372 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3373 | int ret; |
3374 | unsigned int i, nr_entries; | |
3375 | ||
437d5aa5 | 3376 | container_type = type->container_type; |
12bb2edb | 3377 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3378 | ret = -EINVAL; |
3379 | goto end; | |
3380 | } | |
437d5aa5 | 3381 | enum_desc = type->desc; |
141ddf28 MD |
3382 | nr_entries = enum_desc->nr_entries; |
3383 | ||
3384 | ret = print_tabs(session, nesting); | |
3385 | if (ret) | |
3386 | goto end; | |
ceabb767 MD |
3387 | ret = lttng_metadata_printf(session, "enum : "); |
3388 | if (ret) | |
3389 | goto end; | |
437d5aa5 MD |
3390 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3391 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3392 | if (ret) |
ceabb767 MD |
3393 | goto end; |
3394 | ret = lttng_metadata_printf(session, " {\n"); | |
3395 | if (ret) | |
3396 | goto end; | |
141ddf28 MD |
3397 | /* Dump all entries */ |
3398 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3399 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3400 | int j, len; |
3401 | ||
3402 | ret = print_tabs(session, nesting + 1); | |
3403 | if (ret) | |
3404 | goto end; | |
3405 | ret = lttng_metadata_printf(session, | |
3406 | "\""); | |
3407 | if (ret) | |
3408 | goto end; | |
3409 | len = strlen(entry->string); | |
3410 | /* Escape the character '"' */ | |
3411 | for (j = 0; j < len; j++) { | |
3412 | char c = entry->string[j]; | |
3413 | ||
3414 | switch (c) { | |
3415 | case '"': | |
3416 | ret = lttng_metadata_printf(session, | |
3417 | "\\\""); | |
3418 | break; | |
3419 | case '\\': | |
3420 | ret = lttng_metadata_printf(session, | |
3421 | "\\\\"); | |
3422 | break; | |
3423 | default: | |
3424 | ret = lttng_metadata_printf(session, | |
3425 | "%c", c); | |
3426 | break; | |
3427 | } | |
3428 | if (ret) | |
3429 | goto end; | |
3430 | } | |
08ad1061 PP |
3431 | ret = lttng_metadata_printf(session, "\""); |
3432 | if (ret) | |
3433 | goto end; | |
3434 | ||
3435 | if (entry->options.is_auto) { | |
3436 | ret = lttng_metadata_printf(session, ",\n"); | |
3437 | if (ret) | |
3438 | goto end; | |
141ddf28 | 3439 | } else { |
7c559490 MD |
3440 | ret = lttng_metadata_printf(session, |
3441 | " = "); | |
3442 | if (ret) | |
3443 | goto end; | |
3444 | if (entry->start.signedness) | |
141ddf28 | 3445 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3446 | "%lld", (long long) entry->start.value); |
3447 | else | |
3448 | ret = lttng_metadata_printf(session, | |
3449 | "%llu", entry->start.value); | |
3450 | if (ret) | |
3451 | goto end; | |
3452 | if (entry->start.signedness == entry->end.signedness && | |
3453 | entry->start.value | |
3454 | == entry->end.value) { | |
141ddf28 | 3455 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3456 | ",\n"); |
3457 | } else { | |
3458 | if (entry->end.signedness) { | |
3459 | ret = lttng_metadata_printf(session, | |
3460 | " ... %lld,\n", | |
3461 | (long long) entry->end.value); | |
3462 | } else { | |
3463 | ret = lttng_metadata_printf(session, | |
3464 | " ... %llu,\n", | |
3465 | entry->end.value); | |
3466 | } | |
141ddf28 | 3467 | } |
7c559490 MD |
3468 | if (ret) |
3469 | goto end; | |
141ddf28 | 3470 | } |
141ddf28 MD |
3471 | } |
3472 | ret = print_tabs(session, nesting); | |
3473 | if (ret) | |
3474 | goto end; | |
ceabb767 | 3475 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3476 | end: |
3477 | return ret; | |
3478 | } | |
3479 | ||
d83004aa JD |
3480 | /* |
3481 | * Must be called with sessions_mutex held. | |
3482 | */ | |
c099397a | 3483 | static |
8cdc1a81 | 3484 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3485 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3486 | size_t nesting) |
3487 | { | |
3488 | int ret; | |
437d5aa5 | 3489 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3490 | |
437d5aa5 MD |
3491 | enum_type = lttng_kernel_get_type_enum(field->type); |
3492 | WARN_ON_ONCE(!enum_type); | |
3493 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3494 | if (ret) |
3495 | return ret; | |
3496 | return lttng_field_name_statedump(session, field, nesting); | |
3497 | } | |
3498 | ||
3499 | static | |
8cdc1a81 | 3500 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3501 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3502 | size_t nesting) |
3503 | { | |
3504 | int ret; | |
3505 | ||
437d5aa5 MD |
3506 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3507 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3508 | if (ret) |
3509 | return ret; | |
3510 | return lttng_field_name_statedump(session, field, nesting); | |
3511 | } | |
3512 | ||
3513 | static | |
8cdc1a81 | 3514 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3515 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3516 | size_t nesting) |
3517 | { | |
3518 | int ret; | |
3519 | ||
ceabb767 MD |
3520 | /* Default encoding is UTF8 */ |
3521 | ret = print_tabs(session, nesting); | |
3522 | if (ret) | |
3523 | return ret; | |
3524 | ret = lttng_metadata_printf(session, | |
3525 | "string%s", | |
437d5aa5 | 3526 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3527 | " { encoding = ASCII; }" : ""); |
3528 | return ret; | |
3529 | } | |
3530 | ||
3531 | static | |
8cdc1a81 | 3532 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3533 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3534 | size_t nesting) |
ceabb767 | 3535 | { |
437d5aa5 | 3536 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3537 | int ret; |
3538 | ||
437d5aa5 MD |
3539 | string_type = lttng_kernel_get_type_string(field->type); |
3540 | WARN_ON_ONCE(!string_type); | |
3541 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3542 | if (ret) |
3543 | return ret; | |
3544 | return lttng_field_name_statedump(session, field, nesting); | |
3545 | } | |
3546 | ||
3547 | /* | |
3548 | * Must be called with sessions_mutex held. | |
3549 | */ | |
3550 | static | |
8cdc1a81 | 3551 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3552 | const struct lttng_kernel_type_common *type, |
3553 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3554 | size_t nesting) |
c099397a | 3555 | { |
c099397a | 3556 | int ret = 0; |
c099397a | 3557 | |
12bb2edb MD |
3558 | switch (type->type) { |
3559 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3560 | ret = _lttng_integer_type_statedump(session, |
3561 | lttng_kernel_get_type_integer(type), | |
3562 | parent_encoding, nesting); | |
8070f5c0 | 3563 | break; |
437d5aa5 MD |
3564 | case lttng_kernel_type_enum: |
3565 | ret = _lttng_enum_type_statedump(session, | |
3566 | lttng_kernel_get_type_enum(type), | |
3567 | nesting); | |
8070f5c0 | 3568 | break; |
12bb2edb | 3569 | case lttng_kernel_type_string: |
437d5aa5 MD |
3570 | ret = _lttng_string_type_statedump(session, |
3571 | lttng_kernel_get_type_string(type), | |
3572 | nesting); | |
ceabb767 | 3573 | break; |
437d5aa5 MD |
3574 | case lttng_kernel_type_struct: |
3575 | ret = _lttng_struct_type_statedump(session, | |
3576 | lttng_kernel_get_type_struct(type), | |
3577 | nesting); | |
8070f5c0 | 3578 | break; |
437d5aa5 MD |
3579 | case lttng_kernel_type_variant: |
3580 | ret = _lttng_variant_type_statedump(session, | |
3581 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3582 | nesting, NULL); |
ceabb767 MD |
3583 | break; |
3584 | ||
3585 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3586 | case lttng_kernel_type_array: |
3587 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3588 | default: |
3589 | WARN_ON_ONCE(1); | |
3590 | return -EINVAL; | |
8070f5c0 | 3591 | } |
ceabb767 MD |
3592 | return ret; |
3593 | } | |
8070f5c0 | 3594 | |
ceabb767 MD |
3595 | /* |
3596 | * Must be called with sessions_mutex held. | |
3597 | */ | |
3598 | static | |
8cdc1a81 | 3599 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3600 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3601 | size_t nesting, |
3602 | const char **prev_field_name_p) | |
ceabb767 | 3603 | { |
51ef4536 | 3604 | const char *prev_field_name = NULL; |
ceabb767 | 3605 | int ret = 0; |
27d2368e | 3606 | |
51ef4536 MD |
3607 | if (prev_field_name_p) |
3608 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3609 | switch (field->type->type) { |
12bb2edb | 3610 | case lttng_kernel_type_integer: |
ceabb767 MD |
3611 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3612 | break; | |
437d5aa5 | 3613 | case lttng_kernel_type_enum: |
ceabb767 | 3614 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3615 | break; |
12bb2edb | 3616 | case lttng_kernel_type_string: |
ceabb767 | 3617 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3618 | break; |
437d5aa5 | 3619 | case lttng_kernel_type_struct: |
ceabb767 | 3620 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3621 | break; |
437d5aa5 | 3622 | case lttng_kernel_type_array: |
ceabb767 | 3623 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3624 | break; |
437d5aa5 | 3625 | case lttng_kernel_type_sequence: |
51ef4536 | 3626 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3627 | break; |
437d5aa5 | 3628 | case lttng_kernel_type_variant: |
51ef4536 | 3629 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3630 | break; |
f513b2bf | 3631 | |
8070f5c0 MD |
3632 | default: |
3633 | WARN_ON_ONCE(1); | |
3634 | return -EINVAL; | |
3635 | } | |
51ef4536 MD |
3636 | if (prev_field_name_p) |
3637 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3638 | return ret; |
3639 | } | |
3640 | ||
3641 | static | |
8cdc1a81 | 3642 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3643 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3644 | { |
51ef4536 | 3645 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3646 | int ret = 0; |
3647 | int i; | |
3648 | ||
3649 | if (!ctx) | |
3650 | return 0; | |
3651 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3652 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3653 | |
51ef4536 | 3654 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3655 | if (ret) |
3656 | return ret; | |
3657 | } | |
3658 | return ret; | |
3659 | } | |
3660 | ||
3661 | static | |
8cdc1a81 | 3662 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3663 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3664 | { |
51ef4536 | 3665 | const char *prev_field_name = NULL; |
a67ba386 | 3666 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3667 | int ret = 0; |
3668 | int i; | |
3669 | ||
6c8c025b MD |
3670 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3671 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3672 | |
51ef4536 | 3673 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3674 | if (ret) |
3675 | return ret; | |
c099397a MD |
3676 | } |
3677 | return ret; | |
3678 | } | |
3679 | ||
d83004aa JD |
3680 | /* |
3681 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3682 | * The entire event metadata is printed as a single atomic metadata |
3683 | * transaction. | |
d83004aa | 3684 | */ |
c099397a | 3685 | static |
8cdc1a81 | 3686 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3687 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3688 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3689 | { |
3690 | int ret = 0; | |
3691 | ||
a67ba386 | 3692 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3693 | return 0; |
f7d06400 | 3694 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3695 | return 0; |
3696 | ||
8b97fd42 MD |
3697 | lttng_metadata_begin(session); |
3698 | ||
c099397a MD |
3699 | ret = lttng_metadata_printf(session, |
3700 | "event {\n" | |
ae734547 | 3701 | " name = \"%s\";\n" |
c099397a | 3702 | " id = %u;\n" |
b9074a1b | 3703 | " stream_id = %u;\n", |
a67ba386 MD |
3704 | event_recorder->priv->parent.desc->event_name, |
3705 | event_recorder->priv->id, | |
f7d06400 | 3706 | event_recorder->chan->priv->id); |
c099397a MD |
3707 | if (ret) |
3708 | goto end; | |
3709 | ||
8070f5c0 | 3710 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3711 | " fields := struct {\n" |
3712 | ); | |
3713 | if (ret) | |
3714 | goto end; | |
3715 | ||
a67ba386 | 3716 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3717 | if (ret) |
3718 | goto end; | |
3719 | ||
3720 | /* | |
3721 | * LTTng space reservation can only reserve multiples of the | |
3722 | * byte size. | |
3723 | */ | |
3724 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3725 | " };\n" |
3726 | "};\n\n"); | |
c099397a MD |
3727 | if (ret) |
3728 | goto end; | |
3729 | ||
a67ba386 | 3730 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3731 | end: |
8b97fd42 | 3732 | lttng_metadata_end(session); |
c099397a MD |
3733 | return ret; |
3734 | ||
3735 | } | |
3736 | ||
d83004aa JD |
3737 | /* |
3738 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3739 | * The entire channel metadata is printed as a single atomic metadata |
3740 | * transaction. | |
d83004aa | 3741 | */ |
c099397a | 3742 | static |
8cdc1a81 | 3743 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3744 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3745 | { |
3746 | int ret = 0; | |
3747 | ||
f7d06400 | 3748 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3749 | return 0; |
d83004aa | 3750 | |
f7d06400 | 3751 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3752 | return 0; |
3753 | ||
8b97fd42 MD |
3754 | lttng_metadata_begin(session); |
3755 | ||
f7d06400 | 3756 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3757 | ret = lttng_metadata_printf(session, |
3758 | "stream {\n" | |
3759 | " id = %u;\n" | |
9115fbdc | 3760 | " event.header := %s;\n" |
b9074a1b | 3761 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3762 | chan->priv->id, |
3763 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3764 | "struct event_header_large"); |
3765 | if (ret) | |
3766 | goto end; | |
3767 | ||
f7d06400 | 3768 | if (chan->priv->ctx) { |
b9074a1b MD |
3769 | ret = lttng_metadata_printf(session, |
3770 | " event.context := struct {\n"); | |
3771 | if (ret) | |
3772 | goto end; | |
3773 | } | |
f7d06400 | 3774 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3775 | if (ret) |
3776 | goto end; | |
f7d06400 | 3777 | if (chan->priv->ctx) { |
b9074a1b MD |
3778 | ret = lttng_metadata_printf(session, |
3779 | " };\n"); | |
3780 | if (ret) | |
3781 | goto end; | |
3782 | } | |
8070f5c0 MD |
3783 | |
3784 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3785 | "};\n\n"); |
8070f5c0 | 3786 | |
f7d06400 | 3787 | chan->priv->metadata_dumped = 1; |
c099397a | 3788 | end: |
8b97fd42 | 3789 | lttng_metadata_end(session); |
c099397a MD |
3790 | return ret; |
3791 | } | |
3792 | ||
d83004aa JD |
3793 | /* |
3794 | * Must be called with sessions_mutex held. | |
3795 | */ | |
9115fbdc | 3796 | static |
8cdc1a81 | 3797 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3798 | { |
3799 | return lttng_metadata_printf(session, | |
3800 | "struct packet_context {\n" | |
a3ccff4f MD |
3801 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3802 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3803 | " uint64_t content_size;\n" |
3804 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3805 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3806 | " unsigned long events_discarded;\n" |
9115fbdc | 3807 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3808 | "};\n\n" |
9115fbdc MD |
3809 | ); |
3810 | } | |
3811 | ||
3812 | /* | |
3813 | * Compact header: | |
3814 | * id: range: 0 - 30. | |
3815 | * id 31 is reserved to indicate an extended header. | |
3816 | * | |
3817 | * Large header: | |
3818 | * id: range: 0 - 65534. | |
3819 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3820 | * |
3821 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3822 | */ |
3823 | static | |
8cdc1a81 | 3824 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3825 | { |
3826 | return lttng_metadata_printf(session, | |
3827 | "struct event_header_compact {\n" | |
3828 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3829 | " variant <id> {\n" | |
3830 | " struct {\n" | |
a3ccff4f | 3831 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3832 | " } compact;\n" |
3833 | " struct {\n" | |
3834 | " uint32_t id;\n" | |
a3ccff4f | 3835 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3836 | " } extended;\n" |
3837 | " } v;\n" | |
3838 | "} align(%u);\n" | |
3839 | "\n" | |
3840 | "struct event_header_large {\n" | |
3841 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3842 | " variant <id> {\n" | |
3843 | " struct {\n" | |
a3ccff4f | 3844 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3845 | " } compact;\n" |
3846 | " struct {\n" | |
3847 | " uint32_t id;\n" | |
a3ccff4f | 3848 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3849 | " } extended;\n" |
3850 | " } v;\n" | |
3851 | "} align(%u);\n\n", | |
a90917c3 MD |
3852 | lttng_alignof(uint32_t) * CHAR_BIT, |
3853 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3854 | ); |
3855 | } | |
3856 | ||
a3ccff4f MD |
3857 | /* |
3858 | * Approximation of NTP time of day to clock monotonic correlation, | |
3859 | * taken at start of trace. | |
3860 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3861 | * in future versions. | |
5283350b MD |
3862 | * This function may return a negative offset. It may happen if the |
3863 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3864 | * |
3865 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3866 | * y2038 compliant. | |
a3ccff4f MD |
3867 | */ |
3868 | static | |
8967b2a3 | 3869 | int64_t measure_clock_offset(void) |
a3ccff4f | 3870 | { |
dcb93448 | 3871 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3872 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3873 | int64_t offset; |
a3ccff4f | 3874 | unsigned long flags; |
3636085f MJ |
3875 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3876 | struct timespec64 rts = { 0, 0 }; | |
3877 | #else | |
3878 | struct timespec rts = { 0, 0 }; | |
3879 | #endif | |
a3ccff4f MD |
3880 | |
3881 | /* Disable interrupts to increase correlation precision. */ | |
3882 | local_irq_save(flags); | |
3883 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3884 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3885 | ktime_get_real_ts64(&rts); | |
3886 | #else | |
216b6baa | 3887 | getnstimeofday(&rts); |
3636085f | 3888 | #endif |
a3ccff4f MD |
3889 | monotonic[1] = trace_clock_read64(); |
3890 | local_irq_restore(flags); | |
3891 | ||
dcb93448 | 3892 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3893 | realtime = (uint64_t) rts.tv_sec * tcf; |
3894 | if (tcf == NSEC_PER_SEC) { | |
3895 | realtime += rts.tv_nsec; | |
3896 | } else { | |
3897 | uint64_t n = rts.tv_nsec * tcf; | |
3898 | ||
3899 | do_div(n, NSEC_PER_SEC); | |
3900 | realtime += n; | |
3901 | } | |
dcb93448 | 3902 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3903 | return offset; |
3904 | } | |
3905 | ||
3eb95be4 | 3906 | static |
8cdc1a81 | 3907 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3908 | { |
0f3eaad4 | 3909 | int ret = 0; |
3eb95be4 JR |
3910 | size_t i; |
3911 | char cur; | |
3912 | ||
3913 | i = 0; | |
3914 | cur = string[i]; | |
3915 | while (cur != '\0') { | |
3916 | switch (cur) { | |
3917 | case '\n': | |
3918 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3919 | break; | |
3920 | case '\\': | |
3921 | case '"': | |
3922 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3923 | if (ret) | |
3924 | goto error; | |
3925 | /* We still print the current char */ | |
c190d76e | 3926 | lttng_fallthrough; |
3eb95be4 JR |
3927 | default: |
3928 | ret = lttng_metadata_printf(session, "%c", cur); | |
3929 | break; | |
3930 | } | |
3931 | ||
3932 | if (ret) | |
3933 | goto error; | |
3934 | ||
3935 | cur = string[++i]; | |
3936 | } | |
3937 | error: | |
3938 | return ret; | |
3939 | } | |
3940 | ||
3941 | static | |
8cdc1a81 | 3942 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3943 | const char *field_value) |
3eb95be4 JR |
3944 | { |
3945 | int ret; | |
3946 | ||
1c88f269 | 3947 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3948 | if (ret) |
3949 | goto error; | |
3950 | ||
1c88f269 | 3951 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3952 | if (ret) |
3953 | goto error; | |
3954 | ||
3955 | ret = lttng_metadata_printf(session, "\";\n"); | |
3956 | ||
3957 | error: | |
3958 | return ret; | |
3959 | } | |
3960 | ||
c099397a MD |
3961 | /* |
3962 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3963 | * Must be called with sessions_mutex held. |
c099397a MD |
3964 | */ |
3965 | static | |
8cdc1a81 | 3966 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3967 | { |
8cdc1a81 | 3968 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3969 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3970 | const char *product_uuid; |
f7d06400 | 3971 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3972 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3973 | int ret = 0; |
3974 | ||
585e5dcc | 3975 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3976 | return 0; |
8b97fd42 MD |
3977 | |
3978 | lttng_metadata_begin(session); | |
3979 | ||
8cdc1a81 | 3980 | if (session->priv->metadata_dumped) |
c099397a | 3981 | goto skip_session; |
c099397a | 3982 | |
d793d5e1 | 3983 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3984 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3985 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3986 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3987 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3988 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3989 | |
3990 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3991 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3992 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3993 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3994 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3995 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3996 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3997 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3998 | "\n" |
3999 | "trace {\n" | |
4000 | " major = %u;\n" | |
4001 | " minor = %u;\n" | |
30bdb6e4 | 4002 | " uuid = \"%s\";\n" |
d793d5e1 MD |
4003 | " byte_order = %s;\n" |
4004 | " packet.header := struct {\n" | |
4005 | " uint32_t magic;\n" | |
1ec3f75a | 4006 | " uint8_t uuid[16];\n" |
d793d5e1 | 4007 | " uint32_t stream_id;\n" |
5594698f | 4008 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 4009 | " };\n" |
d793d5e1 | 4010 | "};\n\n", |
a90917c3 MD |
4011 | lttng_alignof(uint8_t) * CHAR_BIT, |
4012 | lttng_alignof(uint16_t) * CHAR_BIT, | |
4013 | lttng_alignof(uint32_t) * CHAR_BIT, | |
4014 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
4015 | sizeof(unsigned long) * CHAR_BIT, |
4016 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
4017 | CTF_SPEC_MAJOR, |
4018 | CTF_SPEC_MINOR, | |
d793d5e1 | 4019 | uuid_s, |
5214fa50 | 4020 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
4021 | "be" |
4022 | #else | |
4023 | "le" | |
4024 | #endif | |
4025 | ); | |
4026 | if (ret) | |
4027 | goto end; | |
4028 | ||
99dc9597 MD |
4029 | ret = lttng_metadata_printf(session, |
4030 | "env {\n" | |
a6058143 | 4031 | " hostname = \"%s\";\n" |
c6c9e10f | 4032 | " domain = \"kernel\";\n" |
99dc9597 | 4033 | " sysname = \"%s\";\n" |
c6c9e10f MD |
4034 | " kernel_release = \"%s\";\n" |
4035 | " kernel_version = \"%s\";\n" | |
4036 | " tracer_name = \"lttng-modules\";\n" | |
4037 | " tracer_major = %d;\n" | |
4038 | " tracer_minor = %d;\n" | |
4039 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 4040 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 4041 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
4042 | utsname()->sysname, |
4043 | utsname()->release, | |
c6c9e10f MD |
4044 | utsname()->version, |
4045 | LTTNG_MODULES_MAJOR_VERSION, | |
4046 | LTTNG_MODULES_MINOR_VERSION, | |
4047 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
4048 | ); |
4049 | if (ret) | |
4050 | goto end; | |
4051 | ||
8cdc1a81 | 4052 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
4053 | if (ret) |
4054 | goto end; | |
4055 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 4056 | session->priv->creation_time); |
3eb95be4 JR |
4057 | if (ret) |
4058 | goto end; | |
4059 | ||
c88f762e GB |
4060 | /* Add the product UUID to the 'env' section */ |
4061 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4062 | if (product_uuid) { | |
4063 | ret = lttng_metadata_printf(session, | |
4064 | " product_uuid = \"%s\";\n", | |
4065 | product_uuid | |
4066 | ); | |
4067 | if (ret) | |
4068 | goto end; | |
4069 | } | |
4070 | ||
4071 | /* Close the 'env' section */ | |
3eb95be4 JR |
4072 | ret = lttng_metadata_printf(session, "};\n\n"); |
4073 | if (ret) | |
4074 | goto end; | |
4075 | ||
a3ccff4f MD |
4076 | ret = lttng_metadata_printf(session, |
4077 | "clock {\n" | |
2754583e MD |
4078 | " name = \"%s\";\n", |
4079 | trace_clock_name() | |
a82c63f1 MD |
4080 | ); |
4081 | if (ret) | |
4082 | goto end; | |
4083 | ||
4084 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4085 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4086 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4087 | clock_uuid_s |
4088 | ); | |
4089 | if (ret) | |
4090 | goto end; | |
4091 | } | |
4092 | ||
4093 | ret = lttng_metadata_printf(session, | |
2754583e | 4094 | " description = \"%s\";\n" |
a3ccff4f MD |
4095 | " freq = %llu; /* Frequency, in Hz */\n" |
4096 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4097 | " offset = %lld;\n" |
a3ccff4f | 4098 | "};\n\n", |
2754583e | 4099 | trace_clock_description(), |
a3ccff4f | 4100 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4101 | (long long) measure_clock_offset() |
a3ccff4f MD |
4102 | ); |
4103 | if (ret) | |
4104 | goto end; | |
4105 | ||
4106 | ret = lttng_metadata_printf(session, | |
4107 | "typealias integer {\n" | |
4108 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4109 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4110 | "} := uint27_clock_monotonic_t;\n" |
4111 | "\n" | |
4112 | "typealias integer {\n" | |
4113 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4114 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4115 | "} := uint32_clock_monotonic_t;\n" |
4116 | "\n" | |
4117 | "typealias integer {\n" | |
4118 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4119 | " map = clock.%s.value;\n" |
a3ccff4f | 4120 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4121 | trace_clock_name(), |
a3ccff4f | 4122 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4123 | trace_clock_name(), |
4124 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4125 | trace_clock_name() | |
a3ccff4f MD |
4126 | ); |
4127 | if (ret) | |
4128 | goto end; | |
4129 | ||
a90917c3 | 4130 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4131 | if (ret) |
4132 | goto end; | |
4133 | ||
a90917c3 | 4134 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4135 | if (ret) |
4136 | goto end; | |
4137 | ||
c099397a | 4138 | skip_session: |
f7d06400 MD |
4139 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4140 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4141 | if (ret) |
4142 | goto end; | |
4143 | } | |
4144 | ||
8cdc1a81 | 4145 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4146 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4147 | event_recorder_priv->pub); | |
c099397a MD |
4148 | if (ret) |
4149 | goto end; | |
4150 | } | |
8cdc1a81 | 4151 | session->priv->metadata_dumped = 1; |
c099397a | 4152 | end: |
8b97fd42 | 4153 | lttng_metadata_end(session); |
c099397a MD |
4154 | return ret; |
4155 | } | |
4156 | ||
c0e31d2e | 4157 | /** |
a90917c3 | 4158 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4159 | * @transport: transport structure |
4160 | * | |
4161 | * Registers a transport which can be used as output to extract the data out of | |
4162 | * LTTng. The module calling this registration function must ensure that no | |
4163 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4164 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4165 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4166 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4167 | * after its registration must it synchronize the TLBs. |
4168 | */ | |
a90917c3 | 4169 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4170 | { |
4171 | /* | |
4172 | * Make sure no page fault can be triggered by the module about to be | |
4173 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4174 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4175 | */ |
263b6c88 | 4176 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4177 | |
4178 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4179 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4180 | mutex_unlock(&sessions_mutex); |
4181 | } | |
a90917c3 | 4182 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4183 | |
4184 | /** | |
a90917c3 | 4185 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4186 | * @transport: transport structure |
4187 | */ | |
a90917c3 | 4188 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4189 | { |
4190 | mutex_lock(&sessions_mutex); | |
4191 | list_del(&transport->node); | |
4192 | mutex_unlock(&sessions_mutex); | |
4193 | } | |
a90917c3 | 4194 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4195 | |
a101fa10 MD |
4196 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4197 | { | |
4198 | /* | |
4199 | * Make sure no page fault can be triggered by the module about to be | |
4200 | * registered. We deal with this here so we don't have to call | |
4201 | * vmalloc_sync_mappings() in each module's init. | |
4202 | */ | |
4203 | wrapper_vmalloc_sync_mappings(); | |
4204 | ||
4205 | mutex_lock(&sessions_mutex); | |
4206 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4207 | mutex_unlock(&sessions_mutex); | |
4208 | } | |
4209 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4210 | ||
4211 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4212 | { | |
4213 | mutex_lock(&sessions_mutex); | |
4214 | list_del(&transport->node); | |
4215 | mutex_unlock(&sessions_mutex); | |
4216 | } | |
4217 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4218 | ||
5f4c791e | 4219 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4220 | |
4221 | enum cpuhp_state lttng_hp_prepare; | |
4222 | enum cpuhp_state lttng_hp_online; | |
4223 | ||
4224 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4225 | { | |
4226 | struct lttng_cpuhp_node *lttng_node; | |
4227 | ||
4228 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4229 | switch (lttng_node->component) { | |
4230 | case LTTNG_RING_BUFFER_FRONTEND: | |
4231 | return 0; | |
4232 | case LTTNG_RING_BUFFER_BACKEND: | |
4233 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4234 | case LTTNG_RING_BUFFER_ITER: | |
4235 | return 0; | |
4236 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4237 | return 0; | |
4238 | default: | |
4239 | return -EINVAL; | |
4240 | } | |
4241 | } | |
4242 | ||
4243 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4244 | { | |
4245 | struct lttng_cpuhp_node *lttng_node; | |
4246 | ||
4247 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4248 | switch (lttng_node->component) { | |
4249 | case LTTNG_RING_BUFFER_FRONTEND: | |
4250 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4251 | case LTTNG_RING_BUFFER_BACKEND: | |
4252 | return 0; | |
4253 | case LTTNG_RING_BUFFER_ITER: | |
4254 | return 0; | |
4255 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4256 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4257 | default: | |
4258 | return -EINVAL; | |
4259 | } | |
4260 | } | |
4261 | ||
4262 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4263 | { | |
4264 | struct lttng_cpuhp_node *lttng_node; | |
4265 | ||
4266 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4267 | switch (lttng_node->component) { | |
4268 | case LTTNG_RING_BUFFER_FRONTEND: | |
4269 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4270 | case LTTNG_RING_BUFFER_BACKEND: | |
4271 | return 0; | |
4272 | case LTTNG_RING_BUFFER_ITER: | |
4273 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4274 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4275 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4276 | default: | |
4277 | return -EINVAL; | |
4278 | } | |
4279 | } | |
4280 | ||
4281 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4282 | { | |
4283 | struct lttng_cpuhp_node *lttng_node; | |
4284 | ||
4285 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4286 | switch (lttng_node->component) { | |
4287 | case LTTNG_RING_BUFFER_FRONTEND: | |
4288 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4289 | case LTTNG_RING_BUFFER_BACKEND: | |
4290 | return 0; | |
4291 | case LTTNG_RING_BUFFER_ITER: | |
4292 | return 0; | |
4293 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4294 | return 0; | |
4295 | default: | |
4296 | return -EINVAL; | |
4297 | } | |
4298 | } | |
4299 | ||
4300 | static int __init lttng_init_cpu_hotplug(void) | |
4301 | { | |
4302 | int ret; | |
4303 | ||
4304 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4305 | lttng_hotplug_prepare, | |
4306 | lttng_hotplug_dead); | |
4307 | if (ret < 0) { | |
4308 | return ret; | |
4309 | } | |
4310 | lttng_hp_prepare = ret; | |
4311 | lttng_rb_set_hp_prepare(ret); | |
4312 | ||
4313 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4314 | lttng_hotplug_online, | |
4315 | lttng_hotplug_offline); | |
4316 | if (ret < 0) { | |
4317 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4318 | lttng_hp_prepare = 0; | |
4319 | return ret; | |
4320 | } | |
4321 | lttng_hp_online = ret; | |
4322 | lttng_rb_set_hp_online(ret); | |
4323 | ||
4324 | return 0; | |
4325 | } | |
4326 | ||
4327 | static void __exit lttng_exit_cpu_hotplug(void) | |
4328 | { | |
4329 | lttng_rb_set_hp_online(0); | |
4330 | cpuhp_remove_multi_state(lttng_hp_online); | |
4331 | lttng_rb_set_hp_prepare(0); | |
4332 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4333 | } | |
4334 | ||
5f4c791e | 4335 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4336 | static int lttng_init_cpu_hotplug(void) |
4337 | { | |
4338 | return 0; | |
4339 | } | |
4340 | static void lttng_exit_cpu_hotplug(void) | |
4341 | { | |
4342 | } | |
5f4c791e | 4343 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4344 | |
a90917c3 | 4345 | static int __init lttng_events_init(void) |
4e3c1b9b | 4346 | { |
1c25284c MD |
4347 | int ret; |
4348 | ||
453b2495 JD |
4349 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4350 | if (ret) | |
4351 | return ret; | |
389d7070 | 4352 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4353 | if (ret) |
4354 | return ret; | |
4355 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4356 | if (ret) |
4357 | return ret; | |
4358 | ret = lttng_probes_init(); | |
389d7070 MD |
4359 | if (ret) |
4360 | return ret; | |
07dfc1d0 | 4361 | ret = lttng_context_init(); |
20591cf7 MD |
4362 | if (ret) |
4363 | return ret; | |
07dfc1d0 MD |
4364 | ret = lttng_tracepoint_init(); |
4365 | if (ret) | |
4366 | goto error_tp; | |
a67ba386 MD |
4367 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4368 | if (!event_recorder_cache) { | |
20591cf7 | 4369 | ret = -ENOMEM; |
a67ba386 | 4370 | goto error_kmem_event_recorder; |
dffef45d | 4371 | } |
a67ba386 MD |
4372 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4373 | if (!event_recorder_private_cache) { | |
4374 | ret = -ENOMEM; | |
4375 | goto error_kmem_event_recorder_private; | |
4376 | } | |
4377 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4378 | if (!event_notifier_cache) { |
4379 | ret = -ENOMEM; | |
4380 | goto error_kmem_event_notifier; | |
20591cf7 | 4381 | } |
a67ba386 MD |
4382 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4383 | if (!event_notifier_private_cache) { | |
4384 | ret = -ENOMEM; | |
4385 | goto error_kmem_event_notifier_private; | |
4386 | } | |
80996790 | 4387 | ret = lttng_abi_init(); |
02119ee5 MD |
4388 | if (ret) |
4389 | goto error_abi; | |
0c956676 MD |
4390 | ret = lttng_logger_init(); |
4391 | if (ret) | |
4392 | goto error_logger; | |
1e367326 MD |
4393 | ret = lttng_init_cpu_hotplug(); |
4394 | if (ret) | |
4395 | goto error_hotplug; | |
101215b7 | 4396 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4397 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4398 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4399 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4400 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4401 | LTTNG_VERSION_NAME, |
4402 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4403 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4404 | #else | |
4405 | "", | |
4406 | #endif | |
4407 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4408 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4409 | #else | |
4410 | ""); | |
4411 | #endif | |
c1551e57 MJ |
4412 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4413 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4414 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4415 | return 0; |
0c956676 | 4416 | |
1e367326 MD |
4417 | error_hotplug: |
4418 | lttng_logger_exit(); | |
0c956676 MD |
4419 | error_logger: |
4420 | lttng_abi_exit(); | |
02119ee5 | 4421 | error_abi: |
a67ba386 MD |
4422 | kmem_cache_destroy(event_notifier_private_cache); |
4423 | error_kmem_event_notifier_private: | |
dffef45d FD |
4424 | kmem_cache_destroy(event_notifier_cache); |
4425 | error_kmem_event_notifier: | |
a67ba386 MD |
4426 | kmem_cache_destroy(event_recorder_private_cache); |
4427 | error_kmem_event_recorder_private: | |
4428 | kmem_cache_destroy(event_recorder_cache); | |
4429 | error_kmem_event_recorder: | |
20591cf7 | 4430 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4431 | error_tp: |
4432 | lttng_context_exit(); | |
101215b7 | 4433 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4434 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4435 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4436 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4437 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4438 | LTTNG_VERSION_NAME, |
4439 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4440 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4441 | #else | |
4442 | "", | |
4443 | #endif | |
4444 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4445 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4446 | #else | |
4447 | ""); | |
4448 | #endif | |
1c25284c | 4449 | return ret; |
4e3c1b9b MD |
4450 | } |
4451 | ||
a90917c3 | 4452 | module_init(lttng_events_init); |
11b5a3c2 | 4453 | |
a90917c3 | 4454 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4455 | { |
8cdc1a81 | 4456 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4457 | |
1e367326 | 4458 | lttng_exit_cpu_hotplug(); |
0c956676 | 4459 | lttng_logger_exit(); |
80996790 | 4460 | lttng_abi_exit(); |
8cdc1a81 MD |
4461 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4462 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4463 | kmem_cache_destroy(event_recorder_cache); |
4464 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4465 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4466 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4467 | lttng_tracepoint_exit(); |
07dfc1d0 | 4468 | lttng_context_exit(); |
101215b7 | 4469 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4470 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4471 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4472 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4473 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4474 | LTTNG_VERSION_NAME, |
4475 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4476 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4477 | #else | |
4478 | "", | |
4479 | #endif | |
4480 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4481 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4482 | #else | |
4483 | ""); | |
4484 | #endif | |
4e3c1b9b | 4485 | } |
92e94819 | 4486 | |
a90917c3 | 4487 | module_exit(lttng_events_exit); |
11b5a3c2 | 4488 | |
7ca11e77 | 4489 | #include <generated/patches.h> |
101215b7 MJ |
4490 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4491 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4492 | #endif | |
4493 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4494 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4495 | #endif | |
92e94819 MD |
4496 | MODULE_LICENSE("GPL and additional rights"); |
4497 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4498 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4499 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4500 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4501 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4502 | LTTNG_MODULES_EXTRAVERSION); |