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); | |
b01155ba | 69 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
7b25ab0e | 70 | static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler); |
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); |
f0bcc14c | 74 | static int _lttng_event_unregister(struct lttng_kernel_event_common *event); |
c099397a | 75 | static |
ee7e9a18 | 76 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event); |
c099397a | 77 | static |
8cdc1a81 | 78 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
79 | static |
80 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 81 | static |
8cdc1a81 | 82 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
83 | const struct lttng_kernel_type_common *type, |
84 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
85 | size_t nesting); |
86 | static | |
8cdc1a81 | 87 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 88 | const struct lttng_kernel_event_field *field, |
51ef4536 | 89 | size_t nesting, const char **prev_field_name_p); |
c099397a | 90 | |
c099397a | 91 | void synchronize_trace(void) |
abcca994 | 92 | { |
05355f0b MJ |
93 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
94 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
95 | synchronize_rcu(); |
96 | #else | |
abcca994 | 97 | synchronize_sched(); |
92da05ce MJ |
98 | #endif |
99 | ||
5f4c791e | 100 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
101 | #ifdef CONFIG_PREEMPT_RT_FULL |
102 | synchronize_rcu(); | |
103 | #endif | |
5f4c791e | 104 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
105 | #ifdef CONFIG_PREEMPT_RT |
106 | synchronize_rcu(); | |
107 | #endif | |
5f4c791e | 108 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
109 | } |
110 | ||
3c997079 MD |
111 | void lttng_lock_sessions(void) |
112 | { | |
113 | mutex_lock(&sessions_mutex); | |
114 | } | |
115 | ||
116 | void lttng_unlock_sessions(void) | |
117 | { | |
118 | mutex_unlock(&sessions_mutex); | |
119 | } | |
120 | ||
9fe593d2 FD |
121 | static struct lttng_transport *lttng_transport_find(const char *name) |
122 | { | |
123 | struct lttng_transport *transport; | |
124 | ||
125 | list_for_each_entry(transport, <tng_transport_list, node) { | |
126 | if (!strcmp(transport->name, name)) | |
127 | return transport; | |
128 | } | |
129 | return NULL; | |
130 | } | |
131 | ||
3c997079 MD |
132 | /* |
133 | * Called with sessions lock held. | |
134 | */ | |
135 | int lttng_session_active(void) | |
136 | { | |
8cdc1a81 | 137 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
138 | |
139 | list_for_each_entry(iter, &sessions, list) { | |
8cdc1a81 | 140 | if (iter->pub->active) |
3c997079 MD |
141 | return 1; |
142 | } | |
143 | return 0; | |
144 | } | |
145 | ||
8cdc1a81 | 146 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 147 | { |
8cdc1a81 MD |
148 | struct lttng_kernel_session *session; |
149 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 150 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 151 | int i; |
4e3c1b9b MD |
152 | |
153 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 154 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 155 | if (!session) |
d83004aa | 156 | goto err; |
8cdc1a81 MD |
157 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
158 | if (!session_priv) | |
159 | goto err_free_session; | |
160 | session->priv = session_priv; | |
161 | session_priv->pub = session; | |
162 | ||
163 | INIT_LIST_HEAD(&session_priv->chan); | |
164 | INIT_LIST_HEAD(&session_priv->events); | |
165 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
166 | |
167 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
168 | GFP_KERNEL); | |
169 | if (!metadata_cache) | |
8cdc1a81 | 170 | goto err_free_session_private; |
0ca42eb7 | 171 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
172 | if (!metadata_cache->data) |
173 | goto err_free_cache; | |
174 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
175 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 176 | mutex_init(&metadata_cache->lock); |
8cdc1a81 | 177 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 178 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
8cdc1a81 | 179 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 180 | sizeof(metadata_cache->uuid)); |
8cdc1a81 | 181 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 182 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
8cdc1a81 MD |
183 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
184 | list_add(&session_priv->list, &sessions); | |
185 | ||
8c0393c3 MD |
186 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
187 | goto tracker_alloc_error; | |
188 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
189 | goto tracker_alloc_error; | |
190 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
191 | goto tracker_alloc_error; | |
192 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
193 | goto tracker_alloc_error; | |
194 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
195 | goto tracker_alloc_error; | |
196 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
197 | goto tracker_alloc_error; | |
198 | ||
4e3c1b9b | 199 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 200 | |
4e3c1b9b | 201 | return session; |
d83004aa | 202 | |
8c0393c3 MD |
203 | tracker_alloc_error: |
204 | lttng_id_tracker_fini(&session->pid_tracker); | |
205 | lttng_id_tracker_fini(&session->vpid_tracker); | |
206 | lttng_id_tracker_fini(&session->uid_tracker); | |
207 | lttng_id_tracker_fini(&session->vuid_tracker); | |
208 | lttng_id_tracker_fini(&session->gid_tracker); | |
209 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
210 | err_free_cache: |
211 | kfree(metadata_cache); | |
8cdc1a81 MD |
212 | err_free_session_private: |
213 | lttng_kvfree(session_priv); | |
d83004aa | 214 | err_free_session: |
48f5e0b5 | 215 | lttng_kvfree(session); |
d83004aa JD |
216 | err: |
217 | mutex_unlock(&sessions_mutex); | |
218 | return NULL; | |
219 | } | |
220 | ||
99f52fcc FD |
221 | static |
222 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
223 | { | |
224 | struct lttng_counter_transport *transport; | |
225 | ||
226 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
227 | if (!strcmp(transport->name, name)) | |
228 | return transport; | |
229 | } | |
230 | return NULL; | |
231 | } | |
232 | ||
233 | struct lttng_counter *lttng_kernel_counter_create( | |
234 | const char *counter_transport_name, | |
235 | size_t number_dimensions, const size_t *dimensions_sizes) | |
236 | { | |
237 | struct lttng_counter *counter = NULL; | |
238 | struct lttng_counter_transport *counter_transport = NULL; | |
239 | ||
240 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
241 | if (!counter_transport) { | |
242 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
243 | counter_transport_name); | |
244 | goto notransport; | |
245 | } | |
246 | if (!try_module_get(counter_transport->owner)) { | |
247 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
248 | goto notransport; | |
249 | } | |
250 | ||
251 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
252 | if (!counter) | |
253 | goto nomem; | |
254 | ||
255 | /* Create event notifier error counter. */ | |
256 | counter->ops = &counter_transport->ops; | |
257 | counter->transport = counter_transport; | |
258 | ||
259 | counter->counter = counter->ops->counter_create( | |
260 | number_dimensions, dimensions_sizes, 0); | |
261 | if (!counter->counter) { | |
262 | goto create_error; | |
263 | } | |
264 | ||
265 | return counter; | |
266 | ||
267 | create_error: | |
268 | lttng_kvfree(counter); | |
269 | nomem: | |
270 | if (counter_transport) | |
271 | module_put(counter_transport->owner); | |
272 | notransport: | |
273 | return NULL; | |
274 | } | |
275 | ||
750b05f2 FD |
276 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
277 | { | |
278 | struct lttng_transport *transport = NULL; | |
279 | struct lttng_event_notifier_group *event_notifier_group; | |
280 | const char *transport_name = "relay-event-notifier"; | |
281 | size_t subbuf_size = 4096; //TODO | |
282 | size_t num_subbuf = 16; //TODO | |
283 | unsigned int switch_timer_interval = 0; | |
284 | unsigned int read_timer_interval = 0; | |
dffef45d | 285 | int i; |
750b05f2 FD |
286 | |
287 | mutex_lock(&sessions_mutex); | |
288 | ||
289 | transport = lttng_transport_find(transport_name); | |
290 | if (!transport) { | |
291 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
292 | transport_name); | |
293 | goto notransport; | |
294 | } | |
295 | if (!try_module_get(transport->owner)) { | |
296 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
297 | transport_name); | |
298 | goto notransport; | |
299 | } | |
300 | ||
301 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
302 | GFP_KERNEL); | |
303 | if (!event_notifier_group) | |
304 | goto nomem; | |
305 | ||
306 | /* | |
307 | * Initialize the ring buffer used to store event notifier | |
308 | * notifications. | |
309 | */ | |
310 | event_notifier_group->ops = &transport->ops; | |
4a399b76 | 311 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
312 | transport_name, event_notifier_group, NULL, |
313 | subbuf_size, num_subbuf, switch_timer_interval, | |
314 | read_timer_interval); | |
315 | if (!event_notifier_group->chan) | |
316 | goto create_error; | |
317 | ||
318 | event_notifier_group->transport = transport; | |
dffef45d FD |
319 | |
320 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
321 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
33af697f MD |
322 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
323 | INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]); | |
dffef45d | 324 | |
750b05f2 FD |
325 | list_add(&event_notifier_group->node, &event_notifier_groups); |
326 | ||
327 | mutex_unlock(&sessions_mutex); | |
328 | ||
329 | return event_notifier_group; | |
330 | ||
331 | create_error: | |
332 | lttng_kvfree(event_notifier_group); | |
333 | nomem: | |
334 | if (transport) | |
335 | module_put(transport->owner); | |
336 | notransport: | |
337 | mutex_unlock(&sessions_mutex); | |
338 | return NULL; | |
339 | } | |
340 | ||
d83004aa JD |
341 | void metadata_cache_destroy(struct kref *kref) |
342 | { | |
343 | struct lttng_metadata_cache *cache = | |
344 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 345 | vfree(cache->data); |
d83004aa | 346 | kfree(cache); |
4e3c1b9b MD |
347 | } |
348 | ||
8cdc1a81 | 349 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 350 | { |
f7d06400 | 351 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 352 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 353 | struct lttng_metadata_stream *metadata_stream; |
09710b83 | 354 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
dda6a249 | 355 | int ret; |
4e3c1b9b MD |
356 | |
357 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 358 | WRITE_ONCE(session->active, 0); |
f7d06400 | 359 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 360 | ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table); |
1ec65de1 MD |
361 | WARN_ON(ret); |
362 | } | |
f237aef8 | 363 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
f0bcc14c | 364 | ret = _lttng_event_unregister(&event_recorder_priv->pub->parent); |
dda6a249 MD |
365 | WARN_ON(ret); |
366 | } | |
abcca994 | 367 | synchronize_trace(); /* Wait for in-flight events to complete */ |
f7d06400 | 368 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 369 | ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table); |
badfe9f5 MD |
370 | WARN_ON(ret); |
371 | } | |
09710b83 MD |
372 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, &session->priv->enablers_head, node) |
373 | lttng_event_enabler_destroy(event_enabler); | |
f237aef8 | 374 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, parent.node) |
0648898e | 375 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
f7d06400 MD |
376 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
377 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
378 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 379 | } |
8cdc1a81 MD |
380 | mutex_lock(&session->priv->metadata_cache->lock); |
381 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 382 | _lttng_metadata_channel_hangup(metadata_stream); |
8cdc1a81 | 383 | mutex_unlock(&session->priv->metadata_cache->lock); |
8c0393c3 MD |
384 | lttng_id_tracker_fini(&session->pid_tracker); |
385 | lttng_id_tracker_fini(&session->vpid_tracker); | |
386 | lttng_id_tracker_fini(&session->uid_tracker); | |
387 | lttng_id_tracker_fini(&session->vuid_tracker); | |
388 | lttng_id_tracker_fini(&session->gid_tracker); | |
389 | lttng_id_tracker_fini(&session->vgid_tracker); | |
8cdc1a81 MD |
390 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
391 | list_del(&session->priv->list); | |
4e3c1b9b | 392 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 393 | lttng_kvfree(session->priv); |
48f5e0b5 | 394 | lttng_kvfree(session); |
4e3c1b9b MD |
395 | } |
396 | ||
dffef45d FD |
397 | void lttng_event_notifier_group_destroy( |
398 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 399 | { |
09710b83 | 400 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
a67ba386 | 401 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
402 | int ret; |
403 | ||
750b05f2 FD |
404 | if (!event_notifier_group) |
405 | return; | |
406 | ||
407 | mutex_lock(&sessions_mutex); | |
dffef45d | 408 | |
6053e75e | 409 | ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table); |
8a8ac9a8 FD |
410 | WARN_ON(ret); |
411 | ||
a67ba386 | 412 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
f237aef8 | 413 | &event_notifier_group->event_notifiers_head, parent.node) { |
f0bcc14c | 414 | ret = _lttng_event_unregister(&event_notifier_priv->pub->parent); |
dffef45d FD |
415 | WARN_ON(ret); |
416 | } | |
417 | ||
b01155ba FD |
418 | /* Wait for in-flight event notifier to complete */ |
419 | synchronize_trace(); | |
420 | ||
21f58fb7 FD |
421 | irq_work_sync(&event_notifier_group->wakeup_pending); |
422 | ||
6053e75e MD |
423 | ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table); |
424 | WARN_ON(ret); | |
8a8ac9a8 | 425 | |
09710b83 | 426 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
dffef45d | 427 | &event_notifier_group->enablers_head, node) |
09710b83 | 428 | lttng_event_enabler_destroy(event_enabler); |
dffef45d | 429 | |
a67ba386 | 430 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
f237aef8 | 431 | &event_notifier_group->event_notifiers_head, parent.node) |
0648898e | 432 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 433 | |
99f52fcc FD |
434 | if (event_notifier_group->error_counter) { |
435 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 436 | |
99f52fcc FD |
437 | error_counter->ops->counter_destroy(error_counter->counter); |
438 | module_put(error_counter->transport->owner); | |
439 | lttng_kvfree(error_counter); | |
440 | event_notifier_group->error_counter = NULL; | |
441 | } | |
442 | ||
4a399b76 | 443 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
444 | module_put(event_notifier_group->transport->owner); |
445 | list_del(&event_notifier_group->node); | |
dffef45d | 446 | |
750b05f2 FD |
447 | mutex_unlock(&sessions_mutex); |
448 | lttng_kvfree(event_notifier_group); | |
449 | } | |
450 | ||
8cdc1a81 | 451 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
452 | { |
453 | int ret; | |
454 | ||
455 | mutex_lock(&sessions_mutex); | |
456 | ret = lttng_statedump_start(session); | |
457 | mutex_unlock(&sessions_mutex); | |
458 | return ret; | |
459 | } | |
460 | ||
8cdc1a81 | 461 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
462 | { |
463 | int ret = 0; | |
f7d06400 | 464 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
465 | |
466 | mutex_lock(&sessions_mutex); | |
467 | if (session->active) { | |
468 | ret = -EBUSY; | |
469 | goto end; | |
470 | } | |
c099397a | 471 | |
3c997079 | 472 | /* Set transient enabler state to "enabled" */ |
8cdc1a81 | 473 | session->priv->tstate = 1; |
3c997079 | 474 | |
4ef81e4a | 475 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 476 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 477 | |
c099397a MD |
478 | /* |
479 | * Snapshot the number of events per channel to know the type of header | |
480 | * we need to use. | |
481 | */ | |
f7d06400 MD |
482 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
483 | if (chan_priv->header_type) | |
484 | continue; /* don't change it if session stop/restart */ | |
485 | if (chan_priv->free_event_id < 31) | |
486 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 487 | else |
f7d06400 | 488 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
489 | } |
490 | ||
64af2437 | 491 | /* Clear each stream's quiescent state. */ |
f7d06400 MD |
492 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
493 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
494 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 495 | } |
64af2437 | 496 | |
a8f2d0c7 | 497 | WRITE_ONCE(session->active, 1); |
8cdc1a81 | 498 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 499 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 500 | if (ret) { |
a8f2d0c7 | 501 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
502 | goto end; |
503 | } | |
504 | ret = lttng_statedump_start(session); | |
360f38ea | 505 | if (ret) |
a8f2d0c7 | 506 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
507 | end: |
508 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 509 | return ret; |
c0e31d2e MD |
510 | } |
511 | ||
8cdc1a81 | 512 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
513 | { |
514 | int ret = 0; | |
f7d06400 | 515 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
516 | |
517 | mutex_lock(&sessions_mutex); | |
518 | if (!session->active) { | |
519 | ret = -EBUSY; | |
520 | goto end; | |
521 | } | |
a8f2d0c7 | 522 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
523 | |
524 | /* Set transient enabler state to "disabled" */ | |
8cdc1a81 | 525 | session->priv->tstate = 0; |
b2bc0bc8 | 526 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
527 | |
528 | /* Set each stream's quiescent state. */ | |
f7d06400 MD |
529 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
530 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
531 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 532 | } |
c0e31d2e MD |
533 | end: |
534 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 535 | return ret; |
c0e31d2e MD |
536 | } |
537 | ||
8cdc1a81 | 538 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
539 | { |
540 | int ret = 0; | |
f7d06400 | 541 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 542 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
8cdc1a81 | 543 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
544 | struct lttng_metadata_stream *stream; |
545 | ||
546 | mutex_lock(&sessions_mutex); | |
547 | if (!session->active) { | |
548 | ret = -EBUSY; | |
549 | goto end; | |
550 | } | |
551 | ||
552 | mutex_lock(&cache->lock); | |
553 | memset(cache->data, 0, cache->cache_alloc); | |
554 | cache->metadata_written = 0; | |
555 | cache->version++; | |
8cdc1a81 | 556 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
557 | stream->metadata_out = 0; |
558 | stream->metadata_in = 0; | |
559 | } | |
560 | mutex_unlock(&cache->lock); | |
561 | ||
8cdc1a81 | 562 | session->priv->metadata_dumped = 0; |
f7d06400 MD |
563 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
564 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
565 | } |
566 | ||
f237aef8 | 567 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
a67ba386 | 568 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
569 | } |
570 | ||
571 | ret = _lttng_session_metadata_statedump(session); | |
572 | ||
573 | end: | |
574 | mutex_unlock(&sessions_mutex); | |
575 | return ret; | |
576 | } | |
577 | ||
6b757027 MD |
578 | static |
579 | bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel) | |
580 | { | |
581 | struct lttng_kernel_channel_buffer *chan_buf; | |
582 | ||
583 | if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER) | |
584 | return false; | |
585 | chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent); | |
586 | if (chan_buf->priv->channel_type == METADATA_CHANNEL) | |
587 | return true; | |
588 | return false; | |
589 | } | |
590 | ||
591 | int lttng_channel_enable(struct lttng_kernel_channel_common *channel) | |
e64957da | 592 | { |
3c997079 | 593 | int ret = 0; |
e64957da | 594 | |
3c997079 | 595 | mutex_lock(&sessions_mutex); |
6b757027 | 596 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
597 | ret = -EPERM; |
598 | goto end; | |
599 | } | |
6b757027 | 600 | if (channel->enabled) { |
3c997079 MD |
601 | ret = -EEXIST; |
602 | goto end; | |
603 | } | |
604 | /* Set transient enabler state to "enabled" */ | |
6b757027 MD |
605 | channel->priv->tstate = 1; |
606 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 | 607 | /* Set atomically the state to "enabled" */ |
6b757027 | 608 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
609 | end: |
610 | mutex_unlock(&sessions_mutex); | |
611 | return ret; | |
e64957da MD |
612 | } |
613 | ||
6b757027 | 614 | int lttng_channel_disable(struct lttng_kernel_channel_common *channel) |
e64957da | 615 | { |
3c997079 | 616 | int ret = 0; |
e64957da | 617 | |
3c997079 | 618 | mutex_lock(&sessions_mutex); |
6b757027 | 619 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
620 | ret = -EPERM; |
621 | goto end; | |
622 | } | |
6b757027 | 623 | if (!channel->enabled) { |
3c997079 MD |
624 | ret = -EEXIST; |
625 | goto end; | |
626 | } | |
627 | /* Set atomically the state to "disabled" */ | |
6b757027 | 628 | WRITE_ONCE(channel->enabled, 0); |
3c997079 | 629 | /* Set transient enabler state to "enabled" */ |
6b757027 MD |
630 | channel->priv->tstate = 0; |
631 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 MD |
632 | end: |
633 | mutex_unlock(&sessions_mutex); | |
634 | return ret; | |
e64957da MD |
635 | } |
636 | ||
9d993668 | 637 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 638 | { |
3c997079 | 639 | int ret = 0; |
e64957da | 640 | |
3c997079 | 641 | mutex_lock(&sessions_mutex); |
9d993668 MD |
642 | switch (event->type) { |
643 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
644 | { | |
645 | struct lttng_kernel_event_recorder *event_recorder = | |
646 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
647 | ||
f7d06400 | 648 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
649 | ret = -EPERM; |
650 | goto end; | |
651 | } | |
a0493bef | 652 | break; |
9d993668 MD |
653 | } |
654 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
655 | switch (event->priv->instrumentation) { | |
656 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
657 | ret = -EINVAL; | |
658 | goto end; | |
659 | default: | |
660 | break; | |
661 | } | |
a0493bef MD |
662 | break; |
663 | default: | |
9d993668 | 664 | break; |
a0493bef | 665 | } |
e64957da | 666 | |
9d993668 | 667 | if (event->enabled) { |
3c997079 MD |
668 | ret = -EEXIST; |
669 | goto end; | |
670 | } | |
a67ba386 | 671 | switch (event->priv->instrumentation) { |
c190d76e MJ |
672 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
673 | lttng_fallthrough; | |
606828e4 | 674 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
675 | ret = -EINVAL; |
676 | break; | |
b4a75708 | 677 | |
c190d76e MJ |
678 | case LTTNG_KERNEL_ABI_KPROBE: |
679 | lttng_fallthrough; | |
606828e4 | 680 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 681 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 682 | break; |
b4a75708 | 683 | |
606828e4 | 684 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 685 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 686 | break; |
b4a75708 | 687 | |
c190d76e MJ |
688 | case LTTNG_KERNEL_ABI_FUNCTION: |
689 | lttng_fallthrough; | |
690 | case LTTNG_KERNEL_ABI_NOOP: | |
691 | lttng_fallthrough; | |
a0493bef MD |
692 | default: |
693 | WARN_ON_ONCE(1); | |
694 | ret = -EINVAL; | |
695 | } | |
3c997079 MD |
696 | end: |
697 | mutex_unlock(&sessions_mutex); | |
698 | return ret; | |
e64957da MD |
699 | } |
700 | ||
9d993668 | 701 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
702 | { |
703 | int ret = 0; | |
704 | ||
705 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
706 | switch (event->type) { |
707 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
708 | { | |
709 | struct lttng_kernel_event_recorder *event_recorder = | |
710 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
711 | ||
f7d06400 | 712 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
713 | ret = -EPERM; |
714 | goto end; | |
715 | } | |
b01155ba | 716 | break; |
9d993668 MD |
717 | } |
718 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
719 | switch (event->priv->instrumentation) { | |
720 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
721 | ret = -EINVAL; | |
722 | goto end; | |
723 | default: | |
724 | break; | |
725 | } | |
2b16f0c9 | 726 | break; |
dffef45d | 727 | default: |
9d993668 | 728 | break; |
dffef45d | 729 | } |
dffef45d | 730 | |
a67ba386 | 731 | if (!event->enabled) { |
dffef45d FD |
732 | ret = -EEXIST; |
733 | goto end; | |
734 | } | |
a67ba386 | 735 | switch (event->priv->instrumentation) { |
c190d76e MJ |
736 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
737 | lttng_fallthrough; | |
606828e4 | 738 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
739 | ret = -EINVAL; |
740 | break; | |
b4a75708 | 741 | |
c190d76e MJ |
742 | case LTTNG_KERNEL_ABI_KPROBE: |
743 | lttng_fallthrough; | |
606828e4 | 744 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 745 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 746 | break; |
b4a75708 | 747 | |
9d993668 MD |
748 | case LTTNG_KERNEL_ABI_KRETPROBE: |
749 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
750 | break; | |
751 | ||
c190d76e MJ |
752 | case LTTNG_KERNEL_ABI_FUNCTION: |
753 | lttng_fallthrough; | |
754 | case LTTNG_KERNEL_ABI_NOOP: | |
755 | lttng_fallthrough; | |
dffef45d FD |
756 | default: |
757 | WARN_ON_ONCE(1); | |
758 | ret = -EINVAL; | |
759 | } | |
760 | end: | |
761 | mutex_unlock(&sessions_mutex); | |
762 | return ret; | |
763 | } | |
764 | ||
4e252d1e | 765 | struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
766 | const char *transport_name, |
767 | void *buf_addr, | |
4e3c1b9b MD |
768 | size_t subbuf_size, size_t num_subbuf, |
769 | unsigned int switch_timer_interval, | |
d83004aa JD |
770 | unsigned int read_timer_interval, |
771 | enum channel_type channel_type) | |
4e3c1b9b | 772 | { |
f7d06400 MD |
773 | struct lttng_kernel_channel_buffer *chan; |
774 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 775 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
776 | |
777 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 778 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 779 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 780 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 781 | if (!transport) { |
5a15f70c | 782 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 783 | transport_name); |
c0e31d2e | 784 | goto notransport; |
f3d01b96 | 785 | } |
a33c9927 | 786 | if (!try_module_get(transport->owner)) { |
5a15f70c | 787 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
788 | goto notransport; |
789 | } | |
f7d06400 | 790 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 791 | if (!chan) |
c0e31d2e | 792 | goto nomem; |
f7d06400 MD |
793 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
794 | if (!chan_priv) | |
795 | goto nomem_priv; | |
796 | chan->priv = chan_priv; | |
797 | chan_priv->pub = chan; | |
798 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
799 | chan->parent.session = session; | |
800 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 801 | chan->ops = &transport->ops; |
125b4df4 MD |
802 | /* |
803 | * Note: the channel creation op already writes into the packet | |
804 | * headers. Therefore the "chan" information used as input | |
805 | * should be already accessible. | |
806 | */ | |
f7d06400 | 807 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
808 | chan, buf_addr, subbuf_size, num_subbuf, |
809 | switch_timer_interval, read_timer_interval); | |
f7d06400 | 810 | if (!chan->priv->rb_chan) |
f3d01b96 | 811 | goto create_error; |
f7d06400 MD |
812 | chan->priv->parent.tstate = 1; |
813 | chan->parent.enabled = 1; | |
814 | chan->priv->transport = transport; | |
815 | chan->priv->channel_type = channel_type; | |
816 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
817 | mutex_unlock(&sessions_mutex); |
818 | return chan; | |
819 | ||
f3d01b96 | 820 | create_error: |
f7d06400 MD |
821 | kfree(chan_priv); |
822 | nomem_priv: | |
f3d01b96 | 823 | kfree(chan); |
c0e31d2e | 824 | nomem: |
a33c9927 MD |
825 | if (transport) |
826 | module_put(transport->owner); | |
c0e31d2e | 827 | notransport: |
e5382b6d | 828 | active: |
4e3c1b9b MD |
829 | mutex_unlock(&sessions_mutex); |
830 | return NULL; | |
831 | } | |
832 | ||
833 | /* | |
d83004aa JD |
834 | * Only used internally at session destruction for per-cpu channels, and |
835 | * when metadata channel is released. | |
836 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 837 | */ |
aa7c23a9 | 838 | static |
f7d06400 | 839 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 840 | { |
f7d06400 MD |
841 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
842 | module_put(chan->priv->transport->owner); | |
843 | list_del(&chan->priv->node); | |
844 | lttng_kernel_destroy_context(chan->priv->ctx); | |
845 | kfree(chan->priv); | |
4e3c1b9b MD |
846 | kfree(chan); |
847 | } | |
848 | ||
f7d06400 | 849 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 850 | { |
f7d06400 | 851 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
852 | |
853 | /* Protect the metadata cache with the sessions_mutex. */ | |
854 | mutex_lock(&sessions_mutex); | |
855 | _lttng_channel_destroy(chan); | |
856 | mutex_unlock(&sessions_mutex); | |
857 | } | |
858 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
859 | ||
860 | static | |
861 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
862 | { | |
863 | stream->finalized = 1; | |
864 | wake_up_interruptible(&stream->read_wait); | |
865 | } | |
866 | ||
756a020c MD |
867 | static |
868 | struct lttng_kernel_event_common *lttng_kernel_event_alloc(struct lttng_event_enabler_common *event_enabler) | |
869 | { | |
870 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
871 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
872 | ||
873 | switch (event_enabler->enabler_type) { | |
874 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
875 | { | |
876 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
877 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
878 | struct lttng_kernel_event_recorder *event_recorder; | |
879 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
880 | struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan; | |
881 | ||
882 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
883 | if (!event_recorder) | |
884 | return NULL; | |
885 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
886 | if (!event_recorder_priv) { | |
887 | kmem_cache_free(event_recorder_private_cache, event_recorder); | |
888 | return NULL; | |
889 | } | |
890 | event_recorder_priv->pub = event_recorder; | |
891 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
892 | event_recorder->priv = event_recorder_priv; | |
893 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
894 | ||
895 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
896 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; | |
897 | event_recorder->priv->parent.instrumentation = itype; | |
898 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
899 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
900 | ||
901 | event_recorder->chan = chan; | |
902 | event_recorder->priv->id = chan->priv->free_event_id++; | |
903 | return &event_recorder->parent; | |
904 | } | |
905 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
906 | { | |
907 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
908 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
909 | struct lttng_kernel_event_notifier *event_notifier; | |
910 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
911 | ||
912 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
913 | if (!event_notifier) | |
914 | return NULL; | |
915 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); | |
916 | if (!event_notifier_priv) { | |
917 | kmem_cache_free(event_notifier_private_cache, event_notifier); | |
918 | return NULL; | |
919 | } | |
920 | event_notifier_priv->pub = event_notifier; | |
921 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
922 | event_notifier->priv = event_notifier_priv; | |
923 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
924 | ||
925 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
926 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; | |
927 | event_notifier->priv->parent.instrumentation = itype; | |
928 | event_notifier->priv->parent.user_token = event_enabler->user_token; | |
929 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
930 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
931 | ||
932 | event_notifier->priv->group = event_notifier_enabler->group; | |
933 | event_notifier->priv->error_counter_index = event_notifier_enabler->error_counter_index; | |
934 | event_notifier->priv->num_captures = 0; | |
935 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
936 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
937 | return &event_notifier->parent; | |
938 | } | |
939 | default: | |
940 | return NULL; | |
941 | } | |
942 | } | |
943 | ||
944 | static | |
945 | void lttng_kernel_event_free(struct lttng_kernel_event_common *event) | |
946 | { | |
947 | switch (event->type) { | |
948 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
949 | { | |
950 | struct lttng_kernel_event_recorder *event_recorder = | |
951 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
952 | ||
953 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
954 | kmem_cache_free(event_recorder_cache, event_recorder); | |
955 | break; | |
956 | } | |
957 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
958 | { | |
959 | struct lttng_kernel_event_notifier *event_notifier = | |
960 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
961 | ||
962 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
963 | kmem_cache_free(event_notifier_cache, event_notifier); | |
964 | break; | |
965 | } | |
966 | default: | |
967 | WARN_ON_ONCE(1); | |
968 | } | |
969 | } | |
a101fa10 | 970 | |
ccefc7ab MD |
971 | static |
972 | int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common *event) | |
973 | { | |
974 | switch (event->type) { | |
975 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
976 | return 0; | |
977 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
978 | { | |
979 | struct lttng_kernel_event_notifier *event_notifier = | |
980 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
981 | struct lttng_counter *error_counter; | |
982 | struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group; | |
983 | size_t dimension_index[1]; | |
984 | int ret; | |
985 | ||
986 | /* | |
987 | * Clear the error counter bucket. The sessiond keeps track of which | |
988 | * bucket is currently in use. We trust it. The session lock | |
989 | * synchronizes against concurrent creation of the error | |
990 | * counter. | |
991 | */ | |
992 | error_counter = event_notifier_group->error_counter; | |
993 | if (!error_counter) | |
994 | return 0; | |
995 | /* | |
996 | * Check that the index is within the boundary of the counter. | |
997 | */ | |
998 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { | |
999 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1000 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); | |
1001 | return -EINVAL; | |
1002 | } | |
1003 | ||
1004 | dimension_index[0] = event_notifier->priv->error_counter_index; | |
1005 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); | |
1006 | if (ret) { | |
1007 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
1008 | event_notifier->priv->error_counter_index); | |
1009 | return -EINVAL; | |
1010 | } | |
1011 | return 0; | |
1012 | } | |
1013 | default: | |
1014 | return -EINVAL; | |
1015 | } | |
1016 | } | |
1017 | ||
e5382b6d MD |
1018 | /* |
1019 | * Supports event creation while tracing session is active. | |
3c997079 | 1020 | * Needs to be called with sessions mutex held. |
e5382b6d | 1021 | */ |
83006ee0 | 1022 | static |
1ae083ba | 1023 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler, |
def1e304 | 1024 | const struct lttng_kernel_event_desc *event_desc) |
4e3c1b9b | 1025 | { |
0def9170 | 1026 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent); |
19b98250 | 1027 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(&event_enabler->parent); |
def1e304 | 1028 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
5b9817ae | 1029 | struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param; |
def1e304 | 1030 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; |
19bef247 | 1031 | struct lttng_kernel_event_common_private *event_priv; |
756a020c | 1032 | struct lttng_kernel_event_common *event; |
756a020c | 1033 | struct lttng_kernel_event_recorder *event_recorder; |
3c997079 MD |
1034 | const char *event_name; |
1035 | struct hlist_head *head; | |
3d084699 | 1036 | int ret; |
4e3c1b9b | 1037 | |
f7d06400 | 1038 | if (chan->priv->free_event_id == -1U) { |
4cf0bf51 | 1039 | ret = -EMFILE; |
e5382b6d | 1040 | goto full; |
abc0446a | 1041 | } |
3c997079 MD |
1042 | |
1043 | switch (itype) { | |
606828e4 | 1044 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1045 | event_name = event_desc->event_name; |
3c997079 | 1046 | break; |
b4a75708 | 1047 | |
c190d76e MJ |
1048 | case LTTNG_KERNEL_ABI_KPROBE: |
1049 | lttng_fallthrough; | |
1050 | case LTTNG_KERNEL_ABI_UPROBE: | |
1051 | lttng_fallthrough; | |
1052 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1053 | lttng_fallthrough; | |
606828e4 | 1054 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
1055 | event_name = event_param->name; |
1056 | break; | |
b4a75708 | 1057 | |
c190d76e MJ |
1058 | case LTTNG_KERNEL_ABI_FUNCTION: |
1059 | lttng_fallthrough; | |
1060 | case LTTNG_KERNEL_ABI_NOOP: | |
1061 | lttng_fallthrough; | |
3c997079 MD |
1062 | default: |
1063 | WARN_ON_ONCE(1); | |
1064 | ret = -EINVAL; | |
1065 | goto type_error; | |
1066 | } | |
4a11ef1c | 1067 | |
0def9170 | 1068 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 | 1069 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
0d223dc6 | 1070 | if (lttng_event_enabler_event_name_match_event(&event_enabler->parent, event_name, event_priv->pub)) { |
3c997079 MD |
1071 | ret = -EEXIST; |
1072 | goto exist; | |
abc0446a MD |
1073 | } |
1074 | } | |
3c997079 | 1075 | |
756a020c MD |
1076 | event = lttng_kernel_event_alloc(&event_enabler->parent); |
1077 | if (!event) { | |
4cf0bf51 | 1078 | ret = -ENOMEM; |
756a020c | 1079 | goto alloc_error; |
abc0446a | 1080 | } |
756a020c | 1081 | event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent); |
3c997079 MD |
1082 | |
1083 | switch (itype) { | |
606828e4 | 1084 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 1085 | /* Event will be enabled by enabler sync. */ |
7cd0f696 MD |
1086 | event->enabled = 0; |
1087 | event->priv->registered = 0; | |
1088 | event->priv->desc = lttng_event_desc_get(event_name); | |
1089 | if (!event->priv->desc) { | |
4cf0bf51 | 1090 | ret = -ENOENT; |
d3dbe23c | 1091 | goto register_error; |
abc0446a | 1092 | } |
3c997079 MD |
1093 | /* Populate lttng_event structure before event registration. */ |
1094 | smp_wmb(); | |
baf20995 | 1095 | break; |
b4a75708 | 1096 | |
606828e4 | 1097 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
1098 | /* |
1099 | * Needs to be explicitly enabled after creation, since | |
1100 | * we may want to apply filters. | |
1101 | */ | |
7cd0f696 MD |
1102 | event->enabled = 0; |
1103 | event->priv->registered = 1; | |
3c997079 MD |
1104 | /* |
1105 | * Populate lttng_event structure before event | |
1106 | * registration. | |
1107 | */ | |
1108 | smp_wmb(); | |
8bf17deb | 1109 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
1110 | event_param->u.kprobe.symbol_name, |
1111 | event_param->u.kprobe.offset, | |
1112 | event_param->u.kprobe.addr, | |
7cd0f696 | 1113 | event); |
abc0446a | 1114 | if (ret) { |
4cf0bf51 | 1115 | ret = -EINVAL; |
d6d808f3 | 1116 | goto register_error; |
abc0446a | 1117 | } |
7cd0f696 | 1118 | ret = try_module_get(event->priv->desc->owner); |
edeb3137 | 1119 | WARN_ON_ONCE(!ret); |
d6d808f3 | 1120 | break; |
b4a75708 | 1121 | |
606828e4 | 1122 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 1123 | { |
756a020c | 1124 | struct lttng_kernel_event_common *event_return; |
a67ba386 | 1125 | struct lttng_kernel_event_recorder *event_recorder_return; |
7371f44c MD |
1126 | |
1127 | /* kretprobe defines 2 events */ | |
a0493bef MD |
1128 | /* |
1129 | * Needs to be explicitly enabled after creation, since | |
1130 | * we may want to apply filters. | |
1131 | */ | |
756a020c MD |
1132 | event->enabled = 0; |
1133 | event->priv->registered = 1; | |
a67ba386 | 1134 | |
756a020c MD |
1135 | event_return = lttng_kernel_event_alloc(&event_enabler->parent); |
1136 | if (!event) { | |
a67ba386 | 1137 | ret = -ENOMEM; |
756a020c | 1138 | goto alloc_error; |
a67ba386 | 1139 | } |
756a020c MD |
1140 | event_recorder_return = container_of(event_return, struct lttng_kernel_event_recorder, parent); |
1141 | ||
1142 | event_return->enabled = 0; | |
1143 | event_return->priv->registered = 1; | |
1144 | ||
7371f44c | 1145 | /* |
a90917c3 | 1146 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1147 | */ |
1148 | smp_wmb(); | |
3c997079 | 1149 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1150 | event_param->u.kretprobe.symbol_name, |
1151 | event_param->u.kretprobe.offset, | |
1152 | event_param->u.kretprobe.addr, | |
756a020c | 1153 | event, event_return); |
7371f44c | 1154 | if (ret) { |
756a020c | 1155 | lttng_kernel_event_free(event_return); |
4cf0bf51 | 1156 | ret = -EINVAL; |
7371f44c MD |
1157 | goto register_error; |
1158 | } | |
1159 | /* Take 2 refs on the module: one per event. */ | |
756a020c | 1160 | ret = try_module_get(event->priv->desc->owner); |
7371f44c | 1161 | WARN_ON_ONCE(!ret); |
756a020c | 1162 | ret = try_module_get(event_return->priv->desc->owner); |
7371f44c | 1163 | WARN_ON_ONCE(!ret); |
ee7e9a18 | 1164 | ret = _lttng_event_recorder_metadata_statedump(event_return); |
abc0446a | 1165 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1166 | if (ret) { |
756a020c | 1167 | lttng_kernel_event_free(event_return); |
7cd0f696 MD |
1168 | module_put(event_return->priv->desc->owner); |
1169 | module_put(event->priv->desc->owner); | |
7371f44c MD |
1170 | goto statedump_error; |
1171 | } | |
19b98250 | 1172 | list_add(&event_return->priv->node, event_list_head); |
7371f44c MD |
1173 | break; |
1174 | } | |
b4a75708 | 1175 | |
606828e4 | 1176 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1177 | /* |
1178 | * Needs to be explicitly enabled after creation, since | |
1179 | * we may want to apply filters. | |
1180 | */ | |
7cd0f696 MD |
1181 | event->enabled = 0; |
1182 | event->priv->registered = 0; | |
1183 | event->priv->desc = event_desc; | |
badfe9f5 | 1184 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1185 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1186 | ret = -EINVAL; |
1187 | goto register_error; | |
606828e4 | 1188 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
7cd0f696 | 1189 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1190 | break; |
606828e4 | 1191 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
7cd0f696 | 1192 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1193 | break; |
1194 | } | |
1195 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1196 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1197 | ret = -EINVAL; |
1198 | goto register_error; | |
606828e4 | 1199 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
7cd0f696 | 1200 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1201 | break; |
606828e4 | 1202 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
7cd0f696 | 1203 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1204 | break; |
1205 | } | |
7cd0f696 | 1206 | if (!event->priv->desc) { |
4cf0bf51 | 1207 | ret = -EINVAL; |
259b6cb3 | 1208 | goto register_error; |
abc0446a | 1209 | } |
1ec65de1 | 1210 | break; |
b4a75708 | 1211 | |
606828e4 | 1212 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1213 | /* |
1214 | * Needs to be explicitly enabled after creation, since | |
1215 | * we may want to apply filters. | |
1216 | */ | |
7cd0f696 MD |
1217 | event->enabled = 0; |
1218 | event->priv->registered = 1; | |
3aed4dca | 1219 | |
a344f64b FD |
1220 | /* |
1221 | * Populate lttng_event structure before event | |
1222 | * registration. | |
1223 | */ | |
1224 | smp_wmb(); | |
149b9a9d | 1225 | |
83b802dc | 1226 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1227 | event_param->u.uprobe.fd, |
7cd0f696 | 1228 | event); |
149b9a9d YB |
1229 | if (ret) |
1230 | goto register_error; | |
7cd0f696 | 1231 | ret = try_module_get(event->priv->desc->owner); |
149b9a9d YB |
1232 | WARN_ON_ONCE(!ret); |
1233 | break; | |
b4a75708 | 1234 | |
c190d76e MJ |
1235 | case LTTNG_KERNEL_ABI_FUNCTION: |
1236 | lttng_fallthrough; | |
1237 | case LTTNG_KERNEL_ABI_NOOP: | |
1238 | lttng_fallthrough; | |
baf20995 MD |
1239 | default: |
1240 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1241 | ret = -EINVAL; |
df07930b | 1242 | goto register_error; |
baf20995 | 1243 | } |
ee7e9a18 | 1244 | ret = _lttng_event_recorder_metadata_statedump(event); |
abc0446a MD |
1245 | WARN_ON_ONCE(ret > 0); |
1246 | if (ret) { | |
c099397a | 1247 | goto statedump_error; |
abc0446a | 1248 | } |
7cd0f696 | 1249 | hlist_add_head(&event->priv->hlist_node, head); |
19b98250 | 1250 | list_add(&event->priv->node, event_list_head); |
a67ba386 | 1251 | return event_recorder; |
4e3c1b9b | 1252 | |
c099397a | 1253 | statedump_error: |
259b6cb3 | 1254 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1255 | register_error: |
756a020c MD |
1256 | lttng_kernel_event_free(event); |
1257 | alloc_error: | |
4e3c1b9b | 1258 | exist: |
3c997079 | 1259 | type_error: |
e5382b6d | 1260 | full: |
4cf0bf51 | 1261 | return ERR_PTR(ret); |
4e3c1b9b MD |
1262 | } |
1263 | ||
83006ee0 MD |
1264 | static |
1265 | struct lttng_kernel_event_notifier *_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler *event_enabler, | |
1bbb5b2d | 1266 | const struct lttng_kernel_event_desc *event_desc) |
dffef45d | 1267 | { |
0def9170 | 1268 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent); |
19b98250 | 1269 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(&event_enabler->parent); |
1bbb5b2d | 1270 | struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param; |
1bbb5b2d | 1271 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; |
19bef247 | 1272 | struct lttng_kernel_event_common_private *event_priv; |
756a020c | 1273 | struct lttng_kernel_event_common *event; |
756a020c | 1274 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1275 | const char *event_name; |
1276 | struct hlist_head *head; | |
1277 | int ret; | |
1278 | ||
1279 | switch (itype) { | |
606828e4 | 1280 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1281 | event_name = event_desc->event_name; |
b01155ba | 1282 | break; |
b4a75708 | 1283 | |
c190d76e MJ |
1284 | case LTTNG_KERNEL_ABI_KPROBE: |
1285 | lttng_fallthrough; | |
1286 | case LTTNG_KERNEL_ABI_UPROBE: | |
1287 | lttng_fallthrough; | |
606828e4 | 1288 | case LTTNG_KERNEL_ABI_SYSCALL: |
1bbb5b2d | 1289 | event_name = event_param->name; |
2b16f0c9 | 1290 | break; |
b4a75708 | 1291 | |
c190d76e MJ |
1292 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1293 | lttng_fallthrough; | |
1294 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1295 | lttng_fallthrough; | |
1296 | case LTTNG_KERNEL_ABI_NOOP: | |
1297 | lttng_fallthrough; | |
dffef45d FD |
1298 | default: |
1299 | WARN_ON_ONCE(1); | |
1300 | ret = -EINVAL; | |
1301 | goto type_error; | |
1302 | } | |
1303 | ||
0def9170 | 1304 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 | 1305 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
0d223dc6 | 1306 | if (lttng_event_enabler_event_name_match_event(&event_enabler->parent, event_name, event_priv->pub)) { |
dffef45d FD |
1307 | ret = -EEXIST; |
1308 | goto exist; | |
1309 | } | |
1310 | } | |
1311 | ||
756a020c MD |
1312 | event = lttng_kernel_event_alloc(&event_enabler->parent); |
1313 | if (!event) { | |
a67ba386 | 1314 | ret = -ENOMEM; |
756a020c | 1315 | goto alloc_error; |
a67ba386 | 1316 | } |
756a020c | 1317 | event_notifier = container_of(event, struct lttng_kernel_event_notifier, parent); |
dffef45d FD |
1318 | |
1319 | switch (itype) { | |
606828e4 | 1320 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1321 | /* Event will be enabled by enabler sync. */ |
7cd0f696 MD |
1322 | event->enabled = 0; |
1323 | event->priv->registered = 0; | |
1324 | event->priv->desc = lttng_event_desc_get(event_name); | |
1325 | if (!event->priv->desc) { | |
dffef45d FD |
1326 | ret = -ENOENT; |
1327 | goto register_error; | |
1328 | } | |
1329 | /* Populate lttng_event_notifier structure before event registration. */ | |
1330 | smp_wmb(); | |
1331 | break; | |
b4a75708 | 1332 | |
606828e4 | 1333 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1334 | /* |
1335 | * Needs to be explicitly enabled after creation, since | |
1336 | * we may want to apply filters. | |
1337 | */ | |
7cd0f696 MD |
1338 | event->enabled = 0; |
1339 | event->priv->registered = 1; | |
2b16f0c9 FD |
1340 | /* |
1341 | * Populate lttng_event_notifier structure before event | |
1342 | * registration. | |
1343 | */ | |
1344 | smp_wmb(); | |
1bbb5b2d MD |
1345 | ret = lttng_kprobes_register_event(event_param->u.kprobe.symbol_name, |
1346 | event_param->u.kprobe.symbol_name, | |
1347 | event_param->u.kprobe.offset, | |
1348 | event_param->u.kprobe.addr, | |
7cd0f696 | 1349 | event); |
2b16f0c9 FD |
1350 | if (ret) { |
1351 | ret = -EINVAL; | |
1352 | goto register_error; | |
1353 | } | |
7cd0f696 | 1354 | ret = try_module_get(event->priv->desc->owner); |
2b16f0c9 FD |
1355 | WARN_ON_ONCE(!ret); |
1356 | break; | |
b4a75708 | 1357 | |
606828e4 | 1358 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1359 | /* |
1360 | * Needs to be explicitly enabled after creation, since | |
1361 | * we may want to apply filters. | |
1362 | */ | |
7cd0f696 MD |
1363 | event->enabled = 0; |
1364 | event->priv->registered = 0; | |
1365 | event->priv->desc = event_desc; | |
1bbb5b2d | 1366 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1367 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1368 | ret = -EINVAL; |
1369 | goto register_error; | |
606828e4 | 1370 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
7cd0f696 | 1371 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1372 | break; |
606828e4 | 1373 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
7cd0f696 | 1374 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1375 | break; |
1376 | } | |
1bbb5b2d | 1377 | switch (event_param->u.syscall.abi) { |
606828e4 | 1378 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1379 | ret = -EINVAL; |
1380 | goto register_error; | |
606828e4 | 1381 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
7cd0f696 | 1382 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1383 | break; |
606828e4 | 1384 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
7cd0f696 | 1385 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1386 | break; |
1387 | } | |
1388 | ||
7cd0f696 | 1389 | if (!event->priv->desc) { |
8a8ac9a8 FD |
1390 | ret = -EINVAL; |
1391 | goto register_error; | |
1392 | } | |
1393 | break; | |
b4a75708 | 1394 | |
606828e4 | 1395 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1396 | /* |
1397 | * Needs to be explicitly enabled after creation, since | |
1398 | * we may want to apply filters. | |
1399 | */ | |
7cd0f696 MD |
1400 | event->enabled = 0; |
1401 | event->priv->registered = 1; | |
9de67196 FD |
1402 | |
1403 | /* | |
1404 | * Populate lttng_event_notifier structure before | |
1405 | * event_notifier registration. | |
1406 | */ | |
1407 | smp_wmb(); | |
1408 | ||
1bbb5b2d MD |
1409 | ret = lttng_uprobes_register_event(event_param->name, |
1410 | event_param->u.uprobe.fd, | |
7cd0f696 | 1411 | event); |
9de67196 FD |
1412 | if (ret) |
1413 | goto register_error; | |
7cd0f696 | 1414 | ret = try_module_get(event->priv->desc->owner); |
9de67196 FD |
1415 | WARN_ON_ONCE(!ret); |
1416 | break; | |
b4a75708 | 1417 | |
c190d76e MJ |
1418 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1419 | lttng_fallthrough; | |
1420 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1421 | lttng_fallthrough; | |
1422 | case LTTNG_KERNEL_ABI_NOOP: | |
1423 | lttng_fallthrough; | |
dffef45d FD |
1424 | default: |
1425 | WARN_ON_ONCE(1); | |
1426 | ret = -EINVAL; | |
1427 | goto register_error; | |
1428 | } | |
1429 | ||
19b98250 | 1430 | list_add(&event->priv->node, event_list_head); |
7cd0f696 | 1431 | hlist_add_head(&event->priv->hlist_node, head); |
99f52fcc | 1432 | |
ccefc7ab MD |
1433 | ret = lttng_kernel_event_notifier_clear_error_counter(event); |
1434 | if (ret) | |
1435 | goto register_error; | |
dffef45d FD |
1436 | return event_notifier; |
1437 | ||
1438 | register_error: | |
756a020c MD |
1439 | lttng_kernel_event_free(event); |
1440 | alloc_error: | |
dffef45d FD |
1441 | exist: |
1442 | type_error: | |
1443 | return ERR_PTR(ret); | |
1444 | } | |
1445 | ||
83006ee0 MD |
1446 | struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
1447 | const struct lttng_kernel_event_desc *event_desc) | |
1448 | { | |
1449 | switch (event_enabler->enabler_type) { | |
1450 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1451 | { | |
1452 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1453 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1454 | struct lttng_kernel_event_recorder *event_recorder; | |
1455 | ||
1456 | event_recorder = _lttng_kernel_event_recorder_create(event_recorder_enabler, event_desc); | |
1457 | if (!event_recorder) | |
1458 | return NULL; | |
1459 | return &event_recorder->parent; | |
1460 | } | |
1461 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1462 | { | |
1463 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1464 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1465 | struct lttng_kernel_event_notifier *event_notifier; | |
1466 | ||
1467 | event_notifier = _lttng_kernel_event_notifier_create(event_notifier_enabler, event_desc); | |
1468 | if (!event_notifier) | |
1469 | return NULL; | |
1470 | return &event_notifier->parent; | |
1471 | } | |
1472 | default: | |
1473 | return NULL; | |
1474 | } | |
1475 | } | |
1476 | ||
1477 | struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, | |
1478 | const struct lttng_kernel_event_desc *event_desc) | |
1479 | { | |
1480 | struct lttng_kernel_event_common *event; | |
1481 | ||
1482 | mutex_lock(&sessions_mutex); | |
1483 | event = _lttng_kernel_event_create(event_enabler, event_desc); | |
1484 | mutex_unlock(&sessions_mutex); | |
1485 | return event; | |
1486 | } | |
1487 | ||
1488 | ||
1489 | ||
99f52fcc FD |
1490 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1491 | const size_t *dim_indexes, int32_t cpu, | |
1492 | int64_t *val, bool *overflow, bool *underflow) | |
1493 | { | |
1494 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1495 | cpu, val, overflow, underflow); | |
1496 | } | |
1497 | ||
1498 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1499 | const size_t *dim_indexes, int64_t *val, | |
1500 | bool *overflow, bool *underflow) | |
1501 | { | |
1502 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1503 | val, overflow, underflow); | |
1504 | } | |
1505 | ||
1506 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1507 | const size_t *dim_indexes) | |
1508 | { | |
1509 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1510 | } | |
1511 | ||
3c997079 MD |
1512 | /* Only used for tracepoints for now. */ |
1513 | static | |
0c851fa0 | 1514 | void register_event(struct lttng_kernel_event_common *event) |
3c997079 | 1515 | { |
437d5aa5 | 1516 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1517 | int ret = -EINVAL; |
3c997079 | 1518 | |
0c851fa0 | 1519 | if (event->priv->registered) |
3c997079 | 1520 | return; |
4ecb5ad5 | 1521 | |
0c851fa0 MD |
1522 | desc = event->priv->desc; |
1523 | switch (event->priv->instrumentation) { | |
606828e4 | 1524 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1525 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1526 | desc->tp_class->probe_callback, |
0c851fa0 | 1527 | event); |
4ecb5ad5 | 1528 | break; |
b4a75708 | 1529 | |
606828e4 | 1530 | case LTTNG_KERNEL_ABI_SYSCALL: |
0c851fa0 | 1531 | ret = lttng_syscall_filter_enable_event(event); |
4ecb5ad5 | 1532 | break; |
b4a75708 | 1533 | |
c190d76e MJ |
1534 | case LTTNG_KERNEL_ABI_KPROBE: |
1535 | lttng_fallthrough; | |
1536 | case LTTNG_KERNEL_ABI_UPROBE: | |
4ecb5ad5 | 1537 | ret = 0; |
f0bcc14c | 1538 | break; |
0c851fa0 MD |
1539 | |
1540 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1541 | switch (event->type) { | |
1542 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1543 | ret = 0; | |
1544 | break; | |
1545 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1546 | WARN_ON_ONCE(1); | |
1547 | break; | |
1548 | } | |
4ecb5ad5 | 1549 | break; |
b4a75708 | 1550 | |
c190d76e MJ |
1551 | case LTTNG_KERNEL_ABI_FUNCTION: |
1552 | lttng_fallthrough; | |
1553 | case LTTNG_KERNEL_ABI_NOOP: | |
1554 | lttng_fallthrough; | |
4ecb5ad5 MD |
1555 | default: |
1556 | WARN_ON_ONCE(1); | |
1557 | } | |
3c997079 | 1558 | if (!ret) |
0c851fa0 | 1559 | event->priv->registered = 1; |
3c997079 MD |
1560 | } |
1561 | ||
f0bcc14c | 1562 | int _lttng_event_unregister(struct lttng_kernel_event_common *event) |
4e3c1b9b | 1563 | { |
f0bcc14c | 1564 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
437d5aa5 | 1565 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1566 | int ret = -EINVAL; |
1567 | ||
a67ba386 | 1568 | if (!event_priv->registered) |
3c997079 MD |
1569 | return 0; |
1570 | ||
a67ba386 MD |
1571 | desc = event_priv->desc; |
1572 | switch (event_priv->instrumentation) { | |
606828e4 | 1573 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1574 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1575 | event_priv->desc->tp_class->probe_callback, |
f0bcc14c | 1576 | event); |
baf20995 | 1577 | break; |
b4a75708 | 1578 | |
606828e4 | 1579 | case LTTNG_KERNEL_ABI_KPROBE: |
f0bcc14c | 1580 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1581 | ret = 0; |
1582 | break; | |
b4a75708 | 1583 | |
606828e4 | 1584 | case LTTNG_KERNEL_ABI_KRETPROBE: |
f0bcc14c MD |
1585 | switch (event->type) { |
1586 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1587 | lttng_kretprobes_unregister(event); | |
1588 | ret = 0; | |
1589 | break; | |
1590 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1591 | WARN_ON_ONCE(1); | |
1592 | break; | |
1593 | } | |
7371f44c | 1594 | break; |
b4a75708 | 1595 | |
606828e4 | 1596 | case LTTNG_KERNEL_ABI_SYSCALL: |
f0bcc14c | 1597 | ret = lttng_syscall_filter_disable_event(event); |
4ecb5ad5 | 1598 | break; |
b4a75708 | 1599 | |
606828e4 | 1600 | case LTTNG_KERNEL_ABI_NOOP: |
f0bcc14c MD |
1601 | switch (event->type) { |
1602 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1603 | ret = 0; | |
1604 | break; | |
1605 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1606 | WARN_ON_ONCE(1); | |
1607 | break; | |
1608 | } | |
259b6cb3 | 1609 | break; |
b4a75708 | 1610 | |
606828e4 | 1611 | case LTTNG_KERNEL_ABI_UPROBE: |
f0bcc14c | 1612 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1613 | ret = 0; |
1614 | break; | |
b4a75708 | 1615 | |
c190d76e MJ |
1616 | case LTTNG_KERNEL_ABI_FUNCTION: |
1617 | lttng_fallthrough; | |
baf20995 MD |
1618 | default: |
1619 | WARN_ON_ONCE(1); | |
1620 | } | |
3c997079 | 1621 | if (!ret) |
a67ba386 | 1622 | event_priv->registered = 0; |
dda6a249 MD |
1623 | return ret; |
1624 | } | |
1625 | ||
1626 | /* | |
1627 | * Only used internally at session destruction. | |
1628 | */ | |
be066e6c | 1629 | static |
0648898e | 1630 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1631 | { |
0648898e | 1632 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1633 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1634 | ||
0648898e MD |
1635 | lttng_free_event_filter_runtime(event); |
1636 | /* Free event enabler refs */ | |
1637 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1638 | &event_priv->enablers_ref_head, node) | |
1639 | kfree(enabler_ref); | |
b4a75708 | 1640 | |
0648898e MD |
1641 | switch (event->type) { |
1642 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1643 | { | |
1644 | struct lttng_kernel_event_recorder *event_recorder = | |
1645 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1646 | |
0648898e MD |
1647 | switch (event_priv->instrumentation) { |
1648 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1649 | lttng_event_desc_put(event_priv->desc); | |
1650 | break; | |
b4a75708 | 1651 | |
0648898e MD |
1652 | case LTTNG_KERNEL_ABI_KPROBE: |
1653 | module_put(event_priv->desc->owner); | |
6a35e5bd | 1654 | lttng_kprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1655 | break; |
b4a75708 | 1656 | |
0648898e MD |
1657 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1658 | module_put(event_priv->desc->owner); | |
eb6b47db | 1659 | lttng_kretprobes_destroy_private(&event_recorder->parent); |
0648898e | 1660 | break; |
b4a75708 | 1661 | |
0648898e MD |
1662 | case LTTNG_KERNEL_ABI_SYSCALL: |
1663 | break; | |
4e3c1b9b | 1664 | |
0648898e MD |
1665 | case LTTNG_KERNEL_ABI_UPROBE: |
1666 | module_put(event_priv->desc->owner); | |
17806c46 | 1667 | lttng_uprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1668 | break; |
3ef5cc03 | 1669 | |
c190d76e MJ |
1670 | case LTTNG_KERNEL_ABI_FUNCTION: |
1671 | lttng_fallthrough; | |
1672 | case LTTNG_KERNEL_ABI_NOOP: | |
1673 | lttng_fallthrough; | |
0648898e MD |
1674 | default: |
1675 | WARN_ON_ONCE(1); | |
1676 | } | |
f237aef8 | 1677 | list_del(&event_recorder->priv->parent.node); |
0648898e MD |
1678 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); |
1679 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1680 | break; |
0648898e MD |
1681 | } |
1682 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1683 | { | |
1684 | struct lttng_kernel_event_notifier *event_notifier = | |
1685 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1686 | |
0648898e MD |
1687 | switch (event_notifier->priv->parent.instrumentation) { |
1688 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1689 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1690 | break; | |
b4a75708 | 1691 | |
0648898e MD |
1692 | case LTTNG_KERNEL_ABI_KPROBE: |
1693 | module_put(event_notifier->priv->parent.desc->owner); | |
6a35e5bd | 1694 | lttng_kprobes_destroy_event_private(&event_notifier->parent); |
0648898e | 1695 | break; |
b4a75708 | 1696 | |
0648898e MD |
1697 | case LTTNG_KERNEL_ABI_SYSCALL: |
1698 | break; | |
b4a75708 | 1699 | |
0648898e MD |
1700 | case LTTNG_KERNEL_ABI_UPROBE: |
1701 | module_put(event_notifier->priv->parent.desc->owner); | |
17806c46 | 1702 | lttng_uprobes_destroy_event_private(&event_notifier->parent); |
0648898e MD |
1703 | break; |
1704 | ||
c190d76e MJ |
1705 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1706 | lttng_fallthrough; | |
1707 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1708 | lttng_fallthrough; | |
1709 | case LTTNG_KERNEL_ABI_NOOP: | |
1710 | lttng_fallthrough; | |
0648898e MD |
1711 | default: |
1712 | WARN_ON_ONCE(1); | |
1713 | } | |
f237aef8 | 1714 | list_del(&event_notifier->priv->parent.node); |
0648898e MD |
1715 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); |
1716 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1717 | break; | |
1718 | } | |
dffef45d FD |
1719 | default: |
1720 | WARN_ON_ONCE(1); | |
1721 | } | |
dffef45d FD |
1722 | } |
1723 | ||
8c0393c3 | 1724 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1725 | enum tracker_type tracker_type) |
e0130fab | 1726 | { |
d1f652f8 MD |
1727 | switch (tracker_type) { |
1728 | case TRACKER_PID: | |
1729 | return &session->pid_tracker; | |
1730 | case TRACKER_VPID: | |
1731 | return &session->vpid_tracker; | |
1732 | case TRACKER_UID: | |
1733 | return &session->uid_tracker; | |
1734 | case TRACKER_VUID: | |
1735 | return &session->vuid_tracker; | |
1736 | case TRACKER_GID: | |
1737 | return &session->gid_tracker; | |
1738 | case TRACKER_VGID: | |
1739 | return &session->vgid_tracker; | |
1740 | default: | |
1741 | WARN_ON_ONCE(1); | |
1742 | return NULL; | |
1743 | } | |
1744 | } | |
1745 | ||
8cdc1a81 | 1746 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1747 | enum tracker_type tracker_type, int id) |
1748 | { | |
8c0393c3 | 1749 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1750 | int ret; |
1751 | ||
d1f652f8 MD |
1752 | tracker = get_tracker(session, tracker_type); |
1753 | if (!tracker) | |
1754 | return -EINVAL; | |
1755 | if (id < -1) | |
e0130fab MD |
1756 | return -EINVAL; |
1757 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1758 | if (id == -1) { |
1759 | /* track all ids: destroy tracker. */ | |
1760 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1761 | ret = 0; |
1762 | } else { | |
d1f652f8 | 1763 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1764 | } |
e0130fab MD |
1765 | mutex_unlock(&sessions_mutex); |
1766 | return ret; | |
1767 | } | |
1768 | ||
8cdc1a81 | 1769 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1770 | enum tracker_type tracker_type, int id) |
e0130fab | 1771 | { |
8c0393c3 | 1772 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1773 | int ret; |
1774 | ||
d1f652f8 MD |
1775 | tracker = get_tracker(session, tracker_type); |
1776 | if (!tracker) | |
1777 | return -EINVAL; | |
1778 | if (id < -1) | |
e0130fab MD |
1779 | return -EINVAL; |
1780 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1781 | if (id == -1) { |
1782 | /* untrack all ids: replace by empty tracker. */ | |
1783 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1784 | } else { |
d1f652f8 | 1785 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1786 | } |
e0130fab MD |
1787 | mutex_unlock(&sessions_mutex); |
1788 | return ret; | |
1789 | } | |
1790 | ||
7e6f9ef6 | 1791 | static |
d1f652f8 | 1792 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1793 | { |
8c0393c3 MD |
1794 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1795 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1796 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1797 | int iter = 0, i; |
1798 | ||
1799 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1800 | if (id_tracker_p) { |
1801 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1802 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1803 | |
f934e302 | 1804 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1805 | if (iter++ >= *pos) |
1806 | return e; | |
1807 | } | |
1808 | } | |
1809 | } else { | |
d1f652f8 | 1810 | /* ID tracker disabled. */ |
7e6f9ef6 | 1811 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1812 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1813 | } |
1814 | iter++; | |
1815 | } | |
1816 | /* End of list */ | |
1817 | return NULL; | |
1818 | } | |
1819 | ||
1820 | /* Called with sessions_mutex held. */ | |
1821 | static | |
d1f652f8 | 1822 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1823 | { |
8c0393c3 MD |
1824 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1825 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1826 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1827 | int iter = 0, i; |
1828 | ||
1829 | (*ppos)++; | |
d1f652f8 MD |
1830 | if (id_tracker_p) { |
1831 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1832 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1833 | |
f934e302 | 1834 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1835 | if (iter++ >= *ppos) |
1836 | return e; | |
1837 | } | |
1838 | } | |
1839 | } else { | |
d1f652f8 | 1840 | /* ID tracker disabled. */ |
7e6f9ef6 | 1841 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1842 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1843 | iter++; |
1844 | } | |
1845 | ||
1846 | /* End of list */ | |
1847 | return NULL; | |
1848 | } | |
1849 | ||
1850 | static | |
d1f652f8 | 1851 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1852 | { |
1853 | mutex_unlock(&sessions_mutex); | |
1854 | } | |
1855 | ||
1856 | static | |
d1f652f8 | 1857 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1858 | { |
8c0393c3 MD |
1859 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1860 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1861 | int id; |
7e6f9ef6 | 1862 | |
d1f652f8 | 1863 | if (p == id_tracker_p) { |
7e6f9ef6 | 1864 | /* Tracker disabled. */ |
d1f652f8 | 1865 | id = -1; |
7e6f9ef6 | 1866 | } else { |
d1f652f8 | 1867 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1868 | |
d1f652f8 MD |
1869 | id = lttng_id_tracker_get_node_id(e); |
1870 | } | |
8c0393c3 | 1871 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1872 | case TRACKER_PID: |
1873 | seq_printf(m, "process { pid = %d; };\n", id); | |
1874 | break; | |
1875 | case TRACKER_VPID: | |
1876 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1877 | break; | |
1878 | case TRACKER_UID: | |
1879 | seq_printf(m, "user { uid = %d; };\n", id); | |
1880 | break; | |
1881 | case TRACKER_VUID: | |
1882 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1883 | break; | |
1884 | case TRACKER_GID: | |
1885 | seq_printf(m, "group { gid = %d; };\n", id); | |
1886 | break; | |
1887 | case TRACKER_VGID: | |
1888 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1889 | break; | |
1890 | default: | |
1891 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1892 | } |
7e6f9ef6 MD |
1893 | return 0; |
1894 | } | |
1895 | ||
1896 | static | |
d1f652f8 MD |
1897 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1898 | .start = id_list_start, | |
1899 | .next = id_list_next, | |
1900 | .stop = id_list_stop, | |
1901 | .show = id_list_show, | |
7e6f9ef6 MD |
1902 | }; |
1903 | ||
1904 | static | |
d1f652f8 | 1905 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1906 | { |
d1f652f8 | 1907 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1908 | } |
1909 | ||
1910 | static | |
d1f652f8 | 1911 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1912 | { |
1913 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1914 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1915 | int ret; |
1916 | ||
d1f652f8 | 1917 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1918 | ret = seq_release(inode, file); |
d1f652f8 | 1919 | if (!ret) |
8c0393c3 | 1920 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1921 | return ret; |
1922 | } | |
1923 | ||
d1f652f8 | 1924 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1925 | .owner = THIS_MODULE, |
d1f652f8 | 1926 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1927 | .read = seq_read, |
1928 | .llseek = seq_lseek, | |
d1f652f8 | 1929 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1930 | }; |
1931 | ||
8cdc1a81 | 1932 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1933 | enum tracker_type tracker_type) |
7e6f9ef6 | 1934 | { |
d1f652f8 | 1935 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1936 | struct seq_file *m; |
1937 | int file_fd, ret; | |
1938 | ||
1939 | file_fd = lttng_get_unused_fd(); | |
1940 | if (file_fd < 0) { | |
1941 | ret = file_fd; | |
1942 | goto fd_error; | |
1943 | } | |
1944 | ||
d1f652f8 MD |
1945 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1946 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1947 | NULL, O_RDWR); |
d1f652f8 MD |
1948 | if (IS_ERR(tracker_ids_list_file)) { |
1949 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1950 | goto file_error; |
1951 | } | |
8cdc1a81 | 1952 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1953 | ret = -EOVERFLOW; |
9c1f4643 MD |
1954 | goto refcount_error; |
1955 | } | |
d1f652f8 | 1956 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1957 | if (ret < 0) |
1958 | goto open_error; | |
d1f652f8 MD |
1959 | m = tracker_ids_list_file->private_data; |
1960 | ||
1961 | m->private = get_tracker(session, tracker_type); | |
1962 | BUG_ON(!m->private); | |
1963 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1964 | |
1965 | return file_fd; | |
1966 | ||
1967 | open_error: | |
8cdc1a81 | 1968 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1969 | refcount_error: |
d1f652f8 | 1970 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1971 | file_error: |
1972 | put_unused_fd(file_fd); | |
1973 | fd_error: | |
1974 | return ret; | |
1975 | } | |
1976 | ||
3c997079 MD |
1977 | /* |
1978 | * Enabler management. | |
1979 | */ | |
1980 | static | |
4993071a PP |
1981 | int lttng_match_enabler_star_glob(const char *desc_name, |
1982 | const char *pattern) | |
3c997079 | 1983 | { |
cbc19040 MD |
1984 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1985 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1986 | return 0; |
1987 | return 1; | |
1988 | } | |
1989 | ||
1990 | static | |
4ecb5ad5 MD |
1991 | int lttng_match_enabler_name(const char *desc_name, |
1992 | const char *name) | |
3c997079 | 1993 | { |
4ecb5ad5 | 1994 | if (strcmp(desc_name, name)) |
3c997079 MD |
1995 | return 0; |
1996 | return 1; | |
1997 | } | |
1998 | ||
8bff0fc3 MD |
1999 | static |
2000 | int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc, | |
8d554755 | 2001 | struct lttng_event_enabler_common *enabler) |
3c997079 | 2002 | { |
4ecb5ad5 | 2003 | const char *desc_name, *enabler_name; |
badfe9f5 | 2004 | bool compat = false, entry = false; |
4ecb5ad5 MD |
2005 | |
2006 | enabler_name = enabler->event_param.name; | |
2007 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 2008 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 2009 | desc_name = desc->event_name; |
3b861b22 FD |
2010 | switch (enabler->format_type) { |
2011 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2012 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2013 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2014 | return lttng_match_enabler_name(desc_name, enabler_name); |
2015 | default: | |
2016 | return -EINVAL; | |
2017 | } | |
4ecb5ad5 | 2018 | break; |
b4a75708 | 2019 | |
606828e4 | 2020 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 2021 | desc_name = desc->event_name; |
badfe9f5 | 2022 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 2023 | desc_name += strlen("compat_"); |
badfe9f5 MD |
2024 | compat = true; |
2025 | } | |
4ecb5ad5 MD |
2026 | if (!strncmp(desc_name, "syscall_exit_", |
2027 | strlen("syscall_exit_"))) { | |
2028 | desc_name += strlen("syscall_exit_"); | |
2029 | } else if (!strncmp(desc_name, "syscall_entry_", | |
2030 | strlen("syscall_entry_"))) { | |
2031 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 2032 | entry = true; |
4ecb5ad5 MD |
2033 | } else { |
2034 | WARN_ON_ONCE(1); | |
2035 | return -EINVAL; | |
2036 | } | |
badfe9f5 | 2037 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 2038 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 2039 | break; |
606828e4 | 2040 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
2041 | if (!entry) |
2042 | return 0; | |
2043 | break; | |
606828e4 | 2044 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
2045 | if (entry) |
2046 | return 0; | |
2047 | break; | |
2048 | default: | |
2049 | return -EINVAL; | |
2050 | } | |
2051 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 2052 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 2053 | break; |
606828e4 | 2054 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
2055 | if (compat) |
2056 | return 0; | |
2057 | break; | |
606828e4 | 2058 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
2059 | if (!compat) |
2060 | return 0; | |
2061 | break; | |
2062 | default: | |
2063 | return -EINVAL; | |
2064 | } | |
2065 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2066 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2067 | switch (enabler->format_type) { |
2068 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2069 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2070 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2071 | return lttng_match_enabler_name(desc_name, enabler_name); |
2072 | default: | |
2073 | return -EINVAL; | |
2074 | } | |
2075 | break; | |
606828e4 | 2076 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2077 | return -EINVAL; /* Not implemented. */ |
2078 | default: | |
2079 | return -EINVAL; | |
2080 | } | |
4ecb5ad5 | 2081 | break; |
b4a75708 | 2082 | |
4ecb5ad5 MD |
2083 | default: |
2084 | WARN_ON_ONCE(1); | |
2085 | return -EINVAL; | |
2086 | } | |
3c997079 MD |
2087 | } |
2088 | ||
8bff0fc3 MD |
2089 | bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
2090 | struct lttng_event_enabler_common *enabler) | |
2091 | { | |
2092 | int ret; | |
2093 | ||
2094 | ret = lttng_desc_match_enabler_check(desc, enabler); | |
2095 | if (ret < 0) { | |
2096 | WARN_ON_ONCE(1); | |
2097 | return false; | |
2098 | } | |
2099 | return ret; | |
2100 | } | |
2101 | ||
5c6ec66a MD |
2102 | bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler, |
2103 | struct lttng_kernel_event_common *event) | |
3c997079 | 2104 | { |
5c6ec66a MD |
2105 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
2106 | return false; | |
b2bc0bc8 | 2107 | |
5c6ec66a MD |
2108 | switch (event_enabler->enabler_type) { |
2109 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2110 | { | |
2111 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2112 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2113 | struct lttng_kernel_event_recorder *event_recorder = | |
2114 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2115 | ||
2116 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
2117 | && event_recorder->chan == event_recorder_enabler->chan) | |
2118 | return true; | |
2119 | else | |
2120 | return false; | |
2121 | } | |
2122 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2123 | { | |
2124 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2125 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2126 | struct lttng_kernel_event_notifier *event_notifier = | |
2127 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2128 | ||
2129 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
2130 | && event_notifier->priv->group == event_notifier_enabler->group | |
2131 | && event->priv->user_token == event_enabler->user_token) | |
2132 | return true; | |
2133 | else | |
2134 | return false; | |
2135 | } | |
2136 | default: | |
2137 | WARN_ON_ONCE(1); | |
2138 | return false; | |
2139 | } | |
3c997079 MD |
2140 | } |
2141 | ||
5c6ec66a MD |
2142 | bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler, |
2143 | const struct lttng_kernel_event_desc *desc, | |
2144 | struct lttng_kernel_event_common *event) | |
b01155ba | 2145 | { |
5c6ec66a MD |
2146 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
2147 | return false; | |
b01155ba | 2148 | |
5c6ec66a MD |
2149 | switch (event_enabler->enabler_type) { |
2150 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2151 | { | |
2152 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2153 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2154 | struct lttng_kernel_event_recorder *event_recorder = | |
2155 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2156 | ||
2157 | if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan) | |
2158 | return true; | |
2159 | else | |
2160 | return false; | |
2161 | } | |
2162 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2163 | { | |
2164 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2165 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2166 | struct lttng_kernel_event_notifier *event_notifier = | |
2167 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2168 | ||
2169 | if (event->priv->desc == desc | |
2170 | && event_notifier->priv->group == event_notifier_enabler->group | |
2171 | && event->priv->user_token == event_enabler->user_token) | |
2172 | return true; | |
2173 | else | |
2174 | return false; | |
2175 | } | |
2176 | default: | |
2177 | WARN_ON_ONCE(1); | |
2178 | return false; | |
2179 | } | |
b01155ba FD |
2180 | } |
2181 | ||
0d223dc6 MD |
2182 | bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler, |
2183 | const char *event_name, | |
2184 | struct lttng_kernel_event_common *event) | |
2185 | { | |
2186 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) | |
2187 | return false; | |
2188 | ||
2189 | switch (event_enabler->enabler_type) { | |
2190 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2191 | { | |
2192 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2193 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2194 | struct lttng_kernel_event_recorder *event_recorder = | |
2195 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2196 | ||
2197 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2198 | && event_recorder->chan == event_recorder_enabler->chan) | |
2199 | return true; | |
2200 | else | |
2201 | return false; | |
2202 | } | |
2203 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2204 | { | |
2205 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2206 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2207 | struct lttng_kernel_event_notifier *event_notifier = | |
2208 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2209 | ||
2210 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2211 | && event_notifier->priv->group == event_notifier_enabler->group | |
2212 | && event->priv->user_token == event_enabler->user_token) | |
2213 | return true; | |
2214 | else | |
2215 | return false; | |
2216 | } | |
2217 | default: | |
2218 | WARN_ON_ONCE(1); | |
2219 | return false; | |
2220 | } | |
2221 | } | |
2222 | ||
3c997079 | 2223 | static |
b2bc0bc8 FD |
2224 | struct lttng_enabler_ref *lttng_enabler_ref( |
2225 | struct list_head *enablers_ref_list, | |
8d554755 | 2226 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2227 | { |
2228 | struct lttng_enabler_ref *enabler_ref; | |
2229 | ||
b2bc0bc8 | 2230 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2231 | if (enabler_ref->ref == enabler) |
2232 | return enabler_ref; | |
2233 | } | |
2234 | return NULL; | |
2235 | } | |
2236 | ||
3c997079 | 2237 | static |
c8e14380 | 2238 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2239 | { |
c8e14380 | 2240 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
437d5aa5 MD |
2241 | struct lttng_kernel_probe_desc *probe_desc; |
2242 | const struct lttng_kernel_event_desc *desc; | |
3c997079 | 2243 | struct list_head *probe_list; |
c8e14380 | 2244 | int i; |
3c997079 MD |
2245 | |
2246 | probe_list = lttng_get_probe_list_head(); | |
2247 | /* | |
2248 | * For each probe event, if we find that a probe event matches | |
2249 | * our enabler, create an associated lttng_event if not | |
2250 | * already present. | |
2251 | */ | |
2252 | list_for_each_entry(probe_desc, probe_list, head) { | |
2253 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2254 | int found = 0; | |
2255 | struct hlist_head *head; | |
83006ee0 | 2256 | struct lttng_kernel_event_common *event; |
19bef247 | 2257 | struct lttng_kernel_event_common_private *event_priv; |
3c997079 MD |
2258 | |
2259 | desc = probe_desc->event_desc[i]; | |
c8e14380 | 2260 | if (!lttng_desc_match_enabler(desc, event_enabler)) |
3c997079 | 2261 | continue; |
3c997079 MD |
2262 | |
2263 | /* | |
2264 | * Check if already created. | |
2265 | */ | |
0def9170 | 2266 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 2267 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
c8e14380 | 2268 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) |
3c997079 MD |
2269 | found = 1; |
2270 | } | |
2271 | if (found) | |
2272 | continue; | |
2273 | ||
2274 | /* | |
83006ee0 | 2275 | * We need to create an event for this event probe. |
3c997079 | 2276 | */ |
c8e14380 | 2277 | event = _lttng_kernel_event_create(event_enabler, desc); |
83006ee0 | 2278 | if (!event) { |
5a15f70c | 2279 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2280 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2281 | } |
2282 | } | |
2283 | } | |
2284 | } | |
2285 | ||
33a39a3c | 2286 | static |
053554ae | 2287 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c MD |
2288 | { |
2289 | int ret; | |
2290 | ||
053554ae | 2291 | ret = lttng_syscalls_register_event(event_enabler); |
8a8ac9a8 | 2292 | WARN_ON_ONCE(ret); |
8a8ac9a8 FD |
2293 | } |
2294 | ||
33a39a3c | 2295 | /* |
8839618b | 2296 | * Create event if it is missing and present in the list of tracepoint probes. |
33a39a3c MD |
2297 | * Should be called with sessions mutex held. |
2298 | */ | |
2299 | static | |
8839618b | 2300 | void lttng_create_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c | 2301 | { |
8839618b | 2302 | switch (event_enabler->event_param.instrumentation) { |
606828e4 | 2303 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
8839618b | 2304 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2305 | break; |
b4a75708 | 2306 | |
606828e4 | 2307 | case LTTNG_KERNEL_ABI_SYSCALL: |
8839618b | 2308 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2309 | break; |
b4a75708 | 2310 | |
33a39a3c MD |
2311 | default: |
2312 | WARN_ON_ONCE(1); | |
2313 | break; | |
2314 | } | |
2315 | } | |
2316 | ||
d619fae9 MD |
2317 | static |
2318 | void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler, | |
2319 | struct lttng_kernel_event_common *event) | |
2320 | { | |
2321 | /* Link filter bytecodes if not linked yet. */ | |
2322 | lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx, | |
2323 | &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head); | |
2324 | } | |
2325 | ||
1e06b222 MD |
2326 | static |
2327 | void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler, | |
2328 | struct lttng_kernel_event_common *event) | |
2329 | { | |
2330 | switch (event_enabler->enabler_type) { | |
2331 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2332 | break; | |
2333 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2334 | { | |
2335 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2336 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2337 | struct lttng_kernel_event_notifier *event_notifier = | |
2338 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2339 | ||
2340 | /* Link capture bytecodes if not linked yet. */ | |
2341 | lttng_enabler_link_bytecode(event->priv->desc, | |
2342 | lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head, | |
2343 | &event_notifier_enabler->capture_bytecode_head); | |
2344 | event_notifier->priv->num_captures = event_notifier_enabler->num_captures; | |
2345 | break; | |
2346 | } | |
2347 | default: | |
2348 | WARN_ON_ONCE(1); | |
2349 | } | |
2350 | } | |
2351 | ||
3c997079 | 2352 | /* |
b2bc0bc8 | 2353 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2354 | * and add backward reference from the event to the enabler. |
2355 | * Should be called with sessions mutex held. | |
2356 | */ | |
2357 | static | |
3622cd47 | 2358 | int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2359 | { |
3622cd47 MD |
2360 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); |
2361 | struct lttng_kernel_event_common_private *event_priv; | |
3c997079 | 2362 | |
3622cd47 | 2363 | lttng_syscall_table_set_wildcard_all(event_enabler); |
badfe9f5 | 2364 | |
3c997079 | 2365 | /* First ensure that probe events are created for this enabler. */ |
3622cd47 | 2366 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2367 | |
3622cd47 MD |
2368 | /* Link the created event with its associated enabler. */ |
2369 | list_for_each_entry(event_priv, event_list_head, node) { | |
2370 | struct lttng_kernel_event_common *event = event_priv->pub; | |
b01155ba FD |
2371 | struct lttng_enabler_ref *enabler_ref; |
2372 | ||
3622cd47 | 2373 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
b01155ba FD |
2374 | continue; |
2375 | ||
3622cd47 | 2376 | enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler); |
b01155ba FD |
2377 | if (!enabler_ref) { |
2378 | /* | |
2379 | * If no backward ref, create it. | |
2380 | * Add backward ref from event_notifier to enabler. | |
2381 | */ | |
2382 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2383 | if (!enabler_ref) | |
2384 | return -ENOMEM; | |
2385 | ||
3622cd47 MD |
2386 | enabler_ref->ref = event_enabler; |
2387 | list_add(&enabler_ref->node, &event_priv->enablers_ref_head); | |
b01155ba FD |
2388 | } |
2389 | ||
3622cd47 MD |
2390 | lttng_event_enabler_init_event_filter(event_enabler, event); |
2391 | lttng_event_enabler_init_event_capture(event_enabler, event); | |
b01155ba FD |
2392 | } |
2393 | return 0; | |
2394 | } | |
2395 | ||
3c997079 MD |
2396 | /* |
2397 | * Called at module load: connect the probe on all enablers matching | |
2398 | * this event. | |
2399 | * Called with sessions lock held. | |
2400 | */ | |
2401 | int lttng_fix_pending_events(void) | |
2402 | { | |
8cdc1a81 | 2403 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2404 | |
8cdc1a81 MD |
2405 | list_for_each_entry(session_priv, &sessions, list) |
2406 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2407 | return 0; |
2408 | } | |
2409 | ||
b01155ba FD |
2410 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2411 | struct lttng_event_notifier_group *event_notifier_group) | |
2412 | { | |
09710b83 | 2413 | struct lttng_event_enabler_common *event_enabler; |
b01155ba | 2414 | |
09710b83 MD |
2415 | list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) { |
2416 | if (event_enabler->enabled) | |
b01155ba FD |
2417 | return true; |
2418 | } | |
2419 | return false; | |
2420 | } | |
2421 | ||
2422 | bool lttng_event_notifier_active(void) | |
2423 | { | |
2424 | struct lttng_event_notifier_group *event_notifier_group; | |
2425 | ||
2426 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2427 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2428 | return true; | |
2429 | } | |
2430 | return false; | |
2431 | } | |
2432 | ||
2433 | int lttng_fix_pending_event_notifiers(void) | |
2434 | { | |
2435 | struct lttng_event_notifier_group *event_notifier_group; | |
2436 | ||
2437 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2438 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2439 | return 0; | |
2440 | } | |
2441 | ||
1ae083ba | 2442 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2443 | enum lttng_enabler_format_type format_type, |
606828e4 | 2444 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2445 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2446 | { |
1ae083ba | 2447 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2448 | |
b2bc0bc8 FD |
2449 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2450 | if (!event_enabler) | |
3c997079 | 2451 | return NULL; |
0bb716a8 | 2452 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2453 | event_enabler->parent.format_type = format_type; |
2454 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2455 | memcpy(&event_enabler->parent.event_param, event_param, | |
2456 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2457 | event_enabler->chan = chan; |
3c997079 | 2458 | /* ctx left NULL */ |
5b9817ae | 2459 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2460 | return event_enabler; |
2461 | } | |
2462 | ||
2463 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2464 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2465 | { |
3c997079 | 2466 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2467 | list_add(&event_enabler->parent.node, &session->priv->enablers_head); |
2468 | event_enabler->parent.published = true; | |
def1e304 | 2469 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 | 2470 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2471 | } |
2472 | ||
7b25ab0e | 2473 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2474 | { |
2475 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2476 | event_enabler->enabled = 1; |
2477 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2478 | mutex_unlock(&sessions_mutex); |
2479 | return 0; | |
2480 | } | |
2481 | ||
7b25ab0e | 2482 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2483 | { |
2484 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2485 | event_enabler->enabled = 0; |
2486 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2487 | mutex_unlock(&sessions_mutex); |
2488 | return 0; | |
2489 | } | |
2490 | ||
b2bc0bc8 | 2491 | static |
8d554755 | 2492 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2493 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2494 | { |
d64ca521 | 2495 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2496 | uint32_t bytecode_len; |
2497 | int ret; | |
2498 | ||
2499 | ret = get_user(bytecode_len, &bytecode->len); | |
2500 | if (ret) | |
2501 | return ret; | |
52cfcdf3 | 2502 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2503 | GFP_KERNEL); |
2504 | if (!bytecode_node) | |
2505 | return -ENOMEM; | |
2506 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2507 | sizeof(*bytecode) + bytecode_len); | |
2508 | if (ret) | |
2509 | goto error_free; | |
b2bc0bc8 | 2510 | |
8a445457 | 2511 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2512 | bytecode_node->enabler = enabler; |
2513 | /* Enforce length based on allocated size */ | |
2514 | bytecode_node->bc.len = bytecode_len; | |
2515 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2516 | |
07dfc1d0 MD |
2517 | return 0; |
2518 | ||
2519 | error_free: | |
52cfcdf3 | 2520 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2521 | return ret; |
2522 | } | |
2523 | ||
6048044f | 2524 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2525 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2526 | { |
2527 | int ret; | |
6048044f | 2528 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2529 | if (ret) |
2530 | goto error; | |
7b25ab0e | 2531 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2532 | return 0; |
2533 | ||
2534 | error: | |
2535 | return ret; | |
2536 | } | |
2537 | ||
e2d5dbc7 | 2538 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2539 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2540 | { |
2541 | ||
e2d5dbc7 | 2542 | switch (event->priv->instrumentation) { |
606828e4 | 2543 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2544 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2545 | default: |
2546 | return -EINVAL; | |
2547 | } | |
2548 | } | |
2549 | ||
3c997079 | 2550 | static |
8d554755 | 2551 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2552 | { |
d64ca521 | 2553 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2554 | |
2555 | /* Destroy filter bytecode */ | |
2556 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2557 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2558 | lttng_kvfree(filter_node); |
07dfc1d0 | 2559 | } |
b2bc0bc8 FD |
2560 | } |
2561 | ||
44b1abdc | 2562 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2563 | { |
09710b83 MD |
2564 | lttng_enabler_destroy(event_enabler); |
2565 | if (event_enabler->published) | |
2566 | list_del(&event_enabler->node); | |
2567 | ||
44b1abdc MD |
2568 | switch (event_enabler->enabler_type) { |
2569 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2570 | { | |
2571 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2572 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2573 | ||
44b1abdc MD |
2574 | kfree(event_recorder_enabler); |
2575 | break; | |
2576 | } | |
2577 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2578 | { | |
2579 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2580 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2581 | |
44b1abdc MD |
2582 | kfree(event_notifier_enabler); |
2583 | break; | |
2584 | } | |
2585 | default: | |
2586 | WARN_ON_ONCE(1); | |
2587 | } | |
3c997079 MD |
2588 | } |
2589 | ||
dffef45d | 2590 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
dffef45d | 2591 | enum lttng_enabler_format_type format_type, |
1bbb5b2d MD |
2592 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
2593 | struct lttng_event_notifier_group *event_notifier_group) | |
dffef45d FD |
2594 | { |
2595 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2596 | ||
2597 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2598 | if (!event_notifier_enabler) | |
2599 | return NULL; | |
2600 | ||
0bb716a8 | 2601 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2602 | event_notifier_enabler->parent.format_type = format_type; |
2603 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2604 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2605 | ||
99f52fcc | 2606 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2607 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2608 | |
5b9817ae MD |
2609 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2610 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2611 | |
5b9817ae MD |
2612 | event_notifier_enabler->parent.enabled = 0; |
2613 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d | 2614 | event_notifier_enabler->group = event_notifier_group; |
1bbb5b2d MD |
2615 | return event_notifier_enabler; |
2616 | } | |
dffef45d | 2617 | |
1bbb5b2d MD |
2618 | void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group, |
2619 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2620 | { | |
dffef45d | 2621 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2622 | list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head); |
2623 | event_notifier_enabler->parent.published = true; | |
b01155ba | 2624 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d | 2625 | mutex_unlock(&sessions_mutex); |
dffef45d FD |
2626 | } |
2627 | ||
2628 | int lttng_event_notifier_enabler_enable( | |
2629 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2630 | { | |
2631 | mutex_lock(&sessions_mutex); | |
2632 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2633 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2634 | mutex_unlock(&sessions_mutex); |
2635 | return 0; | |
2636 | } | |
2637 | ||
2638 | int lttng_event_notifier_enabler_disable( | |
2639 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2640 | { | |
2641 | mutex_lock(&sessions_mutex); | |
2642 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2643 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2644 | mutex_unlock(&sessions_mutex); |
2645 | return 0; | |
2646 | } | |
2647 | ||
99d223ad FD |
2648 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2649 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2650 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2651 | { |
d64ca521 | 2652 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2653 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2654 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2655 | uint32_t bytecode_len; | |
2656 | int ret; | |
2657 | ||
2658 | ret = get_user(bytecode_len, &bytecode->len); | |
2659 | if (ret) | |
2660 | return ret; | |
2661 | ||
2662 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2663 | GFP_KERNEL); | |
2664 | if (!bytecode_node) | |
2665 | return -ENOMEM; | |
2666 | ||
2667 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2668 | sizeof(*bytecode) + bytecode_len); | |
2669 | if (ret) | |
2670 | goto error_free; | |
2671 | ||
8a445457 | 2672 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2673 | bytecode_node->enabler = enabler; |
2674 | ||
2675 | /* Enforce length based on allocated size */ | |
2676 | bytecode_node->bc.len = bytecode_len; | |
2677 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2678 | ||
2679 | event_notifier_enabler->num_captures++; | |
2680 | ||
2681 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2682 | goto end; | |
2683 | ||
2684 | error_free: | |
2685 | lttng_kvfree(bytecode_node); | |
2686 | end: | |
2687 | return ret; | |
2688 | } | |
2689 | ||
cc5719b1 MD |
2690 | static |
2691 | void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event) | |
2692 | { | |
2693 | int has_enablers_without_filter_bytecode = 0, nr_filters = 0; | |
2694 | struct lttng_kernel_bytecode_runtime *runtime; | |
2695 | struct lttng_enabler_ref *enabler_ref; | |
2696 | ||
2697 | /* Check if has enablers without bytecode enabled */ | |
2698 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2699 | if (enabler_ref->ref->enabled | |
2700 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2701 | has_enablers_without_filter_bytecode = 1; | |
2702 | break; | |
2703 | } | |
2704 | } | |
2705 | event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode; | |
2706 | ||
2707 | /* Enable filters */ | |
2708 | list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) { | |
2709 | lttng_bytecode_sync_state(runtime); | |
2710 | nr_filters++; | |
2711 | } | |
2712 | WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters)); | |
2713 | } | |
2714 | ||
2715 | static | |
2716 | void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event) | |
2717 | { | |
2718 | switch (event->type) { | |
2719 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2720 | break; | |
2721 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2722 | { | |
2723 | struct lttng_kernel_event_notifier *event_notifier = | |
2724 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2725 | struct lttng_kernel_bytecode_runtime *runtime; | |
2726 | int nr_captures = 0; | |
2727 | ||
2728 | /* Enable captures */ | |
2729 | list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) { | |
2730 | lttng_bytecode_sync_state(runtime); | |
2731 | nr_captures++; | |
2732 | } | |
2733 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
2734 | break; | |
2735 | } | |
2736 | default: | |
2737 | WARN_ON_ONCE(1); | |
2738 | } | |
2739 | } | |
2740 | ||
a0c6ad2e MD |
2741 | static |
2742 | bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event) | |
2743 | { | |
2744 | struct lttng_enabler_ref *enabler_ref; | |
2745 | bool enabled = false; | |
2746 | ||
2747 | switch (event->priv->instrumentation) { | |
2748 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2749 | lttng_fallthrough; | |
2750 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2751 | /* Enable events */ | |
2752 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2753 | if (enabler_ref->ref->enabled) { | |
2754 | enabled = true; | |
2755 | break; | |
2756 | } | |
2757 | } | |
2758 | break; | |
2759 | default: | |
2760 | WARN_ON_ONCE(1); | |
2761 | return false; | |
2762 | } | |
2763 | ||
2764 | switch (event->type) { | |
2765 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2766 | { | |
2767 | struct lttng_kernel_event_recorder *event_recorder = | |
2768 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2769 | ||
2770 | /* | |
2771 | * Enabled state is based on union of enablers, with | |
2772 | * intersection of session and channel transient enable | |
2773 | * states. | |
2774 | */ | |
2775 | return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate; | |
2776 | } | |
2777 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2778 | return enabled; | |
2779 | default: | |
2780 | WARN_ON_ONCE(1); | |
2781 | return false; | |
2782 | } | |
2783 | } | |
2784 | ||
2785 | static | |
2786 | bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event) | |
2787 | { | |
2788 | switch (event->priv->instrumentation) { | |
2789 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2790 | lttng_fallthrough; | |
2791 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2792 | return true; | |
2793 | ||
2794 | default: | |
2795 | /* Not handled with lazy sync. */ | |
2796 | return false; | |
2797 | } | |
2798 | } | |
2799 | ||
3c997079 | 2800 | /* |
3c997079 MD |
2801 | * Should be called with sessions mutex held. |
2802 | */ | |
2803 | static | |
a0c6ad2e MD |
2804 | void lttng_sync_event_list(struct list_head *event_enabler_list, |
2805 | struct list_head *event_list) | |
3c997079 | 2806 | { |
a0c6ad2e | 2807 | struct lttng_kernel_event_common_private *event_priv; |
09710b83 | 2808 | struct lttng_event_enabler_common *event_enabler; |
3c997079 | 2809 | |
a0c6ad2e | 2810 | list_for_each_entry(event_enabler, event_enabler_list, node) |
09710b83 | 2811 | lttng_event_enabler_ref_events(event_enabler); |
a0c6ad2e | 2812 | |
3c997079 MD |
2813 | /* |
2814 | * For each event, if at least one of its enablers is enabled, | |
2815 | * and its channel and session transient states are enabled, we | |
2816 | * enable the event, else we disable it. | |
2817 | */ | |
a0c6ad2e MD |
2818 | list_for_each_entry(event_priv, event_list, node) { |
2819 | struct lttng_kernel_event_common *event = event_priv->pub; | |
2820 | bool enabled; | |
b4a75708 | 2821 | |
a0c6ad2e | 2822 | if (!lttng_event_is_lazy_sync(event)) |
3c997079 | 2823 | continue; |
3c997079 | 2824 | |
a0c6ad2e MD |
2825 | enabled = lttng_get_event_enabled_state(event); |
2826 | WRITE_ONCE(event->enabled, enabled); | |
3c997079 | 2827 | /* |
a0c6ad2e | 2828 | * Sync tracepoint registration with event enabled state. |
3c997079 MD |
2829 | */ |
2830 | if (enabled) { | |
a0c6ad2e | 2831 | register_event(event); |
3c997079 | 2832 | } else { |
a0c6ad2e | 2833 | _lttng_event_unregister(event); |
3c997079 | 2834 | } |
07dfc1d0 | 2835 | |
a0c6ad2e MD |
2836 | lttng_event_sync_filter_state(event); |
2837 | lttng_event_sync_capture_state(event); | |
3c997079 MD |
2838 | } |
2839 | } | |
2840 | ||
a0c6ad2e MD |
2841 | /* |
2842 | * lttng_session_sync_event_enablers should be called just before starting a | |
2843 | * session. | |
2844 | */ | |
2845 | static | |
2846 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) | |
2847 | { | |
2848 | lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events); | |
2849 | } | |
2850 | ||
3c997079 MD |
2851 | /* |
2852 | * Apply enablers to session events, adding events to session if need | |
2853 | * be. It is required after each modification applied to an active | |
2854 | * session, and right before session "start". | |
2855 | * "lazy" sync means we only sync if required. | |
2856 | * Should be called with sessions mutex held. | |
2857 | */ | |
2858 | static | |
8cdc1a81 | 2859 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2860 | { |
2861 | /* We can skip if session is not active */ | |
2862 | if (!session->active) | |
2863 | return; | |
b2bc0bc8 | 2864 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2865 | } |
2866 | ||
b01155ba FD |
2867 | static |
2868 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2869 | { | |
a0c6ad2e | 2870 | lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head); |
b01155ba FD |
2871 | } |
2872 | ||
7b25ab0e MD |
2873 | static |
2874 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2875 | { | |
2876 | switch (event_enabler->enabler_type) { | |
2877 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2878 | { | |
2879 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2880 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2881 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2882 | break; | |
2883 | } | |
2884 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2885 | { | |
2886 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2887 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2888 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2889 | break; | |
2890 | } | |
2891 | default: | |
2892 | WARN_ON_ONCE(1); | |
2893 | } | |
2894 | } | |
2895 | ||
1ec3f75a | 2896 | /* |
d83004aa JD |
2897 | * Serialize at most one packet worth of metadata into a metadata |
2898 | * channel. | |
92d9f5e6 MD |
2899 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2900 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2901 | * allows us to do racy operations such as looking for remaining space left in | |
2902 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2903 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2904 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2905 | * Returns the number of bytes written in the channel, 0 if no data |
2906 | * was written and a negative value on error. | |
1ec3f75a | 2907 | */ |
b3b8072b | 2908 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2909 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2910 | { |
8a57ec02 | 2911 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2912 | int ret = 0; |
2913 | size_t len, reserve_len; | |
2914 | ||
f613e3e6 | 2915 | /* |
92d9f5e6 MD |
2916 | * Ensure we support mutiple get_next / put sequences followed by |
2917 | * put_next. The metadata cache lock protects reading the metadata | |
2918 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2919 | * "flush" operations on the buffer invoked by different processes. | |
2920 | * Moreover, since the metadata cache memory can be reallocated, we | |
2921 | * need to have exclusive access against updates even though we only | |
2922 | * read it. | |
f613e3e6 | 2923 | */ |
92d9f5e6 | 2924 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2925 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2926 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2927 | goto end; |
f613e3e6 | 2928 | |
9616f0bf JD |
2929 | /* Metadata regenerated, change the version. */ |
2930 | if (stream->metadata_cache->version != stream->version) | |
2931 | stream->version = stream->metadata_cache->version; | |
2932 | ||
d83004aa | 2933 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2934 | stream->metadata_in; |
9de2c215 | 2935 | if (!len) |
de23d59d | 2936 | goto end; |
d83004aa | 2937 | reserve_len = min_t(size_t, |
4a399b76 | 2938 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2939 | len); |
a775608d | 2940 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2941 | sizeof(char), NULL); |
d83004aa JD |
2942 | /* |
2943 | * If reservation failed, return an error to the caller. | |
2944 | */ | |
c2fb9c1c | 2945 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2946 | if (ret != 0) { |
2947 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2948 | stream->coherent = false; |
d83004aa JD |
2949 | goto end; |
2950 | } | |
b3b8072b | 2951 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2952 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2953 | reserve_len, 1); |
b3b8072b | 2954 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2955 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2956 | if (reserve_len < len) |
8b97fd42 MD |
2957 | stream->coherent = false; |
2958 | else | |
2959 | stream->coherent = true; | |
d83004aa JD |
2960 | ret = reserve_len; |
2961 | ||
2962 | end: | |
8b97fd42 MD |
2963 | if (coherent) |
2964 | *coherent = stream->coherent; | |
92d9f5e6 | 2965 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2966 | return ret; |
2967 | } | |
2968 | ||
8b97fd42 | 2969 | static |
8cdc1a81 | 2970 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2971 | { |
8cdc1a81 MD |
2972 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2973 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2974 | } |
2975 | ||
2976 | static | |
8cdc1a81 | 2977 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2978 | { |
8cdc1a81 MD |
2979 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2980 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2981 | struct lttng_metadata_stream *stream; |
2982 | ||
8cdc1a81 | 2983 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2984 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2985 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2986 | } |
8b97fd42 MD |
2987 | } |
2988 | ||
d83004aa JD |
2989 | /* |
2990 | * Write the metadata to the metadata cache. | |
2991 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2992 | * The metadata cache lock protects us from concurrent read access from |
2993 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2994 | * The content of the printf is printed as a single atomic metadata |
2995 | * transaction. | |
d83004aa | 2996 | */ |
8cdc1a81 | 2997 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2998 | const char *fmt, ...) |
2999 | { | |
c099397a | 3000 | char *str; |
d83004aa | 3001 | size_t len; |
c099397a MD |
3002 | va_list ap; |
3003 | ||
585e5dcc | 3004 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
3005 | |
3006 | va_start(ap, fmt); | |
3007 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
3008 | va_end(ap); | |
3009 | if (!str) | |
3010 | return -ENOMEM; | |
3011 | ||
1ec3f75a | 3012 | len = strlen(str); |
8cdc1a81 MD |
3013 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3014 | if (session->priv->metadata_cache->metadata_written + len > | |
3015 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
3016 | char *tmp_cache_realloc; |
3017 | unsigned int tmp_cache_alloc_size; | |
3018 | ||
3019 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
3020 | session->priv->metadata_cache->cache_alloc + len, |
3021 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 3022 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
3023 | if (!tmp_cache_realloc) |
3024 | goto err; | |
8cdc1a81 | 3025 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 3026 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
3027 | session->priv->metadata_cache->data, |
3028 | session->priv->metadata_cache->cache_alloc); | |
3029 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
3030 | } |
3031 | ||
8cdc1a81 MD |
3032 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3033 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3034 | } |
8cdc1a81 MD |
3035 | memcpy(session->priv->metadata_cache->data + |
3036 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3037 | str, len); |
8cdc1a81 | 3038 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3039 | kfree(str); |
d83004aa | 3040 | |
d83004aa JD |
3041 | return 0; |
3042 | ||
3043 | err: | |
3044 | kfree(str); | |
3045 | return -ENOMEM; | |
c099397a MD |
3046 | } |
3047 | ||
f513b2bf | 3048 | static |
8cdc1a81 | 3049 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3050 | { |
3051 | size_t i; | |
3052 | ||
3053 | for (i = 0; i < nesting; i++) { | |
3054 | int ret; | |
3055 | ||
3056 | ret = lttng_metadata_printf(session, " "); | |
3057 | if (ret) { | |
3058 | return ret; | |
3059 | } | |
3060 | } | |
3061 | return 0; | |
3062 | } | |
3063 | ||
ceabb767 | 3064 | static |
8cdc1a81 | 3065 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3066 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3067 | size_t nesting) |
3068 | { | |
3069 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3070 | } | |
3071 | ||
3072 | static | |
8cdc1a81 | 3073 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3074 | const struct lttng_kernel_type_integer *type, |
3075 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3076 | size_t nesting) |
3077 | { | |
3078 | int ret; | |
3079 | ||
ceabb767 MD |
3080 | ret = print_tabs(session, nesting); |
3081 | if (ret) | |
3082 | return ret; | |
3083 | ret = lttng_metadata_printf(session, | |
3084 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3085 | type->size, |
3086 | type->alignment, | |
3087 | type->signedness, | |
3088 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3089 | ? "none" |
437d5aa5 | 3090 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3091 | ? "UTF8" |
3092 | : "ASCII", | |
437d5aa5 | 3093 | type->base, |
ceabb767 | 3094 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3095 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3096 | #else |
437d5aa5 | 3097 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3098 | #endif |
3099 | ); | |
3100 | return ret; | |
3101 | } | |
3102 | ||
f513b2bf MD |
3103 | /* |
3104 | * Must be called with sessions_mutex held. | |
3105 | */ | |
3106 | static | |
8cdc1a81 | 3107 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3108 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3109 | size_t nesting) |
3110 | { | |
51ef4536 | 3111 | const char *prev_field_name = NULL; |
f513b2bf MD |
3112 | int ret; |
3113 | uint32_t i, nr_fields; | |
ceabb767 MD |
3114 | unsigned int alignment; |
3115 | ||
f513b2bf MD |
3116 | ret = print_tabs(session, nesting); |
3117 | if (ret) | |
3118 | return ret; | |
3119 | ret = lttng_metadata_printf(session, | |
3120 | "struct {\n"); | |
3121 | if (ret) | |
3122 | return ret; | |
437d5aa5 | 3123 | nr_fields = type->nr_fields; |
f513b2bf | 3124 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3125 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3126 | |
437d5aa5 | 3127 | iter_field = type->fields[i]; |
51ef4536 | 3128 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3129 | if (ret) |
3130 | return ret; | |
3131 | } | |
3132 | ret = print_tabs(session, nesting); | |
3133 | if (ret) | |
3134 | return ret; | |
437d5aa5 | 3135 | alignment = type->alignment; |
ceabb767 MD |
3136 | if (alignment) { |
3137 | ret = lttng_metadata_printf(session, | |
3138 | "} align(%u)", | |
3139 | alignment); | |
3140 | } else { | |
3141 | ret = lttng_metadata_printf(session, | |
3142 | "}"); | |
3143 | } | |
f513b2bf MD |
3144 | return ret; |
3145 | } | |
3146 | ||
3147 | /* | |
3148 | * Must be called with sessions_mutex held. | |
3149 | */ | |
3150 | static | |
8cdc1a81 | 3151 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3152 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3153 | size_t nesting) |
3154 | { | |
3155 | int ret; | |
3156 | ||
3157 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3158 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3159 | if (ret) |
3160 | return ret; | |
ceabb767 | 3161 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3162 | } |
3163 | ||
65c85aa6 MD |
3164 | /* |
3165 | * Must be called with sessions_mutex held. | |
3166 | */ | |
3167 | static | |
8cdc1a81 | 3168 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3169 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3170 | size_t nesting, |
3171 | const char *prev_field_name) | |
65c85aa6 | 3172 | { |
51ef4536 | 3173 | const char *tag_name; |
65c85aa6 MD |
3174 | int ret; |
3175 | uint32_t i, nr_choices; | |
3176 | ||
51ef4536 MD |
3177 | tag_name = type->tag_name; |
3178 | if (!tag_name) | |
3179 | tag_name = prev_field_name; | |
3180 | if (!tag_name) | |
3181 | return -EINVAL; | |
ceabb767 MD |
3182 | /* |
3183 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3184 | */ | |
437d5aa5 | 3185 | if (type->alignment != 0) |
ceabb767 | 3186 | return -EINVAL; |
65c85aa6 MD |
3187 | ret = print_tabs(session, nesting); |
3188 | if (ret) | |
3189 | return ret; | |
3190 | ret = lttng_metadata_printf(session, | |
3191 | "variant <_%s> {\n", | |
51ef4536 | 3192 | tag_name); |
65c85aa6 MD |
3193 | if (ret) |
3194 | return ret; | |
437d5aa5 | 3195 | nr_choices = type->nr_choices; |
65c85aa6 | 3196 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3197 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3198 | |
437d5aa5 | 3199 | iter_field = type->choices[i]; |
51ef4536 | 3200 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3201 | if (ret) |
3202 | return ret; | |
3203 | } | |
3204 | ret = print_tabs(session, nesting); | |
3205 | if (ret) | |
3206 | return ret; | |
3207 | ret = lttng_metadata_printf(session, | |
3208 | "}"); | |
3209 | return ret; | |
3210 | } | |
3211 | ||
3212 | /* | |
3213 | * Must be called with sessions_mutex held. | |
3214 | */ | |
3215 | static | |
8cdc1a81 | 3216 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3217 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3218 | size_t nesting, |
3219 | const char *prev_field_name) | |
65c85aa6 MD |
3220 | { |
3221 | int ret; | |
3222 | ||
3223 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3224 | lttng_kernel_get_type_variant(field->type), nesting, |
3225 | prev_field_name); | |
65c85aa6 MD |
3226 | if (ret) |
3227 | return ret; | |
ceabb767 | 3228 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3229 | } |
3230 | ||
f513b2bf MD |
3231 | /* |
3232 | * Must be called with sessions_mutex held. | |
3233 | */ | |
3234 | static | |
8cdc1a81 | 3235 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3236 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3237 | size_t nesting) |
3238 | { | |
3239 | int ret; | |
437d5aa5 MD |
3240 | const struct lttng_kernel_type_array *array_type; |
3241 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3242 | |
437d5aa5 MD |
3243 | array_type = lttng_kernel_get_type_array(field->type); |
3244 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3245 | |
437d5aa5 | 3246 | if (array_type->alignment) { |
ceabb767 | 3247 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3248 | if (ret) |
3249 | return ret; | |
ceabb767 MD |
3250 | ret = lttng_metadata_printf(session, |
3251 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3252 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3253 | field->name); |
3254 | if (ret) | |
3255 | return ret; | |
3256 | } | |
3257 | /* | |
3258 | * Nested compound types: Only array of structures and variants are | |
3259 | * currently supported. | |
3260 | */ | |
437d5aa5 | 3261 | elem_type = array_type->elem_type; |
12bb2edb MD |
3262 | switch (elem_type->type) { |
3263 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3264 | case lttng_kernel_type_struct: |
3265 | case lttng_kernel_type_variant: | |
3266 | ret = _lttng_type_statedump(session, elem_type, | |
3267 | array_type->encoding, nesting); | |
65c85aa6 MD |
3268 | if (ret) |
3269 | return ret; | |
3270 | break; | |
ceabb767 | 3271 | |
f513b2bf MD |
3272 | default: |
3273 | return -EINVAL; | |
3274 | } | |
3275 | ret = lttng_metadata_printf(session, | |
3276 | " _%s[%u];\n", | |
3277 | field->name, | |
437d5aa5 | 3278 | array_type->length); |
f513b2bf MD |
3279 | return ret; |
3280 | } | |
3281 | ||
3282 | /* | |
3283 | * Must be called with sessions_mutex held. | |
3284 | */ | |
3285 | static | |
8cdc1a81 | 3286 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3287 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3288 | size_t nesting, |
3289 | const char *prev_field_name) | |
f513b2bf MD |
3290 | { |
3291 | int ret; | |
3292 | const char *length_name; | |
437d5aa5 MD |
3293 | const struct lttng_kernel_type_sequence *sequence_type; |
3294 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3295 | |
437d5aa5 MD |
3296 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3297 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3298 | |
437d5aa5 | 3299 | length_name = sequence_type->length_name; |
51ef4536 MD |
3300 | if (!length_name) |
3301 | length_name = prev_field_name; | |
3302 | if (!length_name) | |
3303 | return -EINVAL; | |
ceabb767 | 3304 | |
437d5aa5 | 3305 | if (sequence_type->alignment) { |
ceabb767 | 3306 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3307 | if (ret) |
3308 | return ret; | |
ceabb767 MD |
3309 | ret = lttng_metadata_printf(session, |
3310 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3311 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3312 | field->name); |
3313 | if (ret) | |
3314 | return ret; | |
3315 | } | |
3316 | ||
3317 | /* | |
3318 | * Nested compound types: Only array of structures and variants are | |
3319 | * currently supported. | |
3320 | */ | |
437d5aa5 | 3321 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3322 | switch (elem_type->type) { |
3323 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3324 | case lttng_kernel_type_struct: |
3325 | case lttng_kernel_type_variant: | |
3326 | ret = _lttng_type_statedump(session, elem_type, | |
3327 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3328 | if (ret) |
3329 | return ret; | |
3330 | break; | |
ceabb767 | 3331 | |
f513b2bf MD |
3332 | default: |
3333 | return -EINVAL; | |
3334 | } | |
3335 | ret = lttng_metadata_printf(session, | |
3336 | " _%s[ _%s ];\n", | |
3337 | field->name, | |
51ef4536 | 3338 | length_name); |
f513b2bf MD |
3339 | return ret; |
3340 | } | |
3341 | ||
141ddf28 MD |
3342 | /* |
3343 | * Must be called with sessions_mutex held. | |
3344 | */ | |
3345 | static | |
8cdc1a81 | 3346 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3347 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3348 | size_t nesting) |
3349 | { | |
d96a4a7a | 3350 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3351 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3352 | int ret; |
3353 | unsigned int i, nr_entries; | |
3354 | ||
437d5aa5 | 3355 | container_type = type->container_type; |
12bb2edb | 3356 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3357 | ret = -EINVAL; |
3358 | goto end; | |
3359 | } | |
437d5aa5 | 3360 | enum_desc = type->desc; |
141ddf28 MD |
3361 | nr_entries = enum_desc->nr_entries; |
3362 | ||
3363 | ret = print_tabs(session, nesting); | |
3364 | if (ret) | |
3365 | goto end; | |
ceabb767 MD |
3366 | ret = lttng_metadata_printf(session, "enum : "); |
3367 | if (ret) | |
3368 | goto end; | |
437d5aa5 MD |
3369 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3370 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3371 | if (ret) |
ceabb767 MD |
3372 | goto end; |
3373 | ret = lttng_metadata_printf(session, " {\n"); | |
3374 | if (ret) | |
3375 | goto end; | |
141ddf28 MD |
3376 | /* Dump all entries */ |
3377 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3378 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3379 | int j, len; |
3380 | ||
3381 | ret = print_tabs(session, nesting + 1); | |
3382 | if (ret) | |
3383 | goto end; | |
3384 | ret = lttng_metadata_printf(session, | |
3385 | "\""); | |
3386 | if (ret) | |
3387 | goto end; | |
3388 | len = strlen(entry->string); | |
3389 | /* Escape the character '"' */ | |
3390 | for (j = 0; j < len; j++) { | |
3391 | char c = entry->string[j]; | |
3392 | ||
3393 | switch (c) { | |
3394 | case '"': | |
3395 | ret = lttng_metadata_printf(session, | |
3396 | "\\\""); | |
3397 | break; | |
3398 | case '\\': | |
3399 | ret = lttng_metadata_printf(session, | |
3400 | "\\\\"); | |
3401 | break; | |
3402 | default: | |
3403 | ret = lttng_metadata_printf(session, | |
3404 | "%c", c); | |
3405 | break; | |
3406 | } | |
3407 | if (ret) | |
3408 | goto end; | |
3409 | } | |
08ad1061 PP |
3410 | ret = lttng_metadata_printf(session, "\""); |
3411 | if (ret) | |
3412 | goto end; | |
3413 | ||
3414 | if (entry->options.is_auto) { | |
3415 | ret = lttng_metadata_printf(session, ",\n"); | |
3416 | if (ret) | |
3417 | goto end; | |
141ddf28 | 3418 | } else { |
7c559490 MD |
3419 | ret = lttng_metadata_printf(session, |
3420 | " = "); | |
3421 | if (ret) | |
3422 | goto end; | |
3423 | if (entry->start.signedness) | |
141ddf28 | 3424 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3425 | "%lld", (long long) entry->start.value); |
3426 | else | |
3427 | ret = lttng_metadata_printf(session, | |
3428 | "%llu", entry->start.value); | |
3429 | if (ret) | |
3430 | goto end; | |
3431 | if (entry->start.signedness == entry->end.signedness && | |
3432 | entry->start.value | |
3433 | == entry->end.value) { | |
141ddf28 | 3434 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3435 | ",\n"); |
3436 | } else { | |
3437 | if (entry->end.signedness) { | |
3438 | ret = lttng_metadata_printf(session, | |
3439 | " ... %lld,\n", | |
3440 | (long long) entry->end.value); | |
3441 | } else { | |
3442 | ret = lttng_metadata_printf(session, | |
3443 | " ... %llu,\n", | |
3444 | entry->end.value); | |
3445 | } | |
141ddf28 | 3446 | } |
7c559490 MD |
3447 | if (ret) |
3448 | goto end; | |
141ddf28 | 3449 | } |
141ddf28 MD |
3450 | } |
3451 | ret = print_tabs(session, nesting); | |
3452 | if (ret) | |
3453 | goto end; | |
ceabb767 | 3454 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3455 | end: |
3456 | return ret; | |
3457 | } | |
3458 | ||
d83004aa JD |
3459 | /* |
3460 | * Must be called with sessions_mutex held. | |
3461 | */ | |
c099397a | 3462 | static |
8cdc1a81 | 3463 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3464 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3465 | size_t nesting) |
3466 | { | |
3467 | int ret; | |
437d5aa5 | 3468 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3469 | |
437d5aa5 MD |
3470 | enum_type = lttng_kernel_get_type_enum(field->type); |
3471 | WARN_ON_ONCE(!enum_type); | |
3472 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3473 | if (ret) |
3474 | return ret; | |
3475 | return lttng_field_name_statedump(session, field, nesting); | |
3476 | } | |
3477 | ||
3478 | static | |
8cdc1a81 | 3479 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3480 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3481 | size_t nesting) |
3482 | { | |
3483 | int ret; | |
3484 | ||
437d5aa5 MD |
3485 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3486 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3487 | if (ret) |
3488 | return ret; | |
3489 | return lttng_field_name_statedump(session, field, nesting); | |
3490 | } | |
3491 | ||
3492 | static | |
8cdc1a81 | 3493 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3494 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3495 | size_t nesting) |
3496 | { | |
3497 | int ret; | |
3498 | ||
ceabb767 MD |
3499 | /* Default encoding is UTF8 */ |
3500 | ret = print_tabs(session, nesting); | |
3501 | if (ret) | |
3502 | return ret; | |
3503 | ret = lttng_metadata_printf(session, | |
3504 | "string%s", | |
437d5aa5 | 3505 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3506 | " { encoding = ASCII; }" : ""); |
3507 | return ret; | |
3508 | } | |
3509 | ||
3510 | static | |
8cdc1a81 | 3511 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3512 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3513 | size_t nesting) |
ceabb767 | 3514 | { |
437d5aa5 | 3515 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3516 | int ret; |
3517 | ||
437d5aa5 MD |
3518 | string_type = lttng_kernel_get_type_string(field->type); |
3519 | WARN_ON_ONCE(!string_type); | |
3520 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3521 | if (ret) |
3522 | return ret; | |
3523 | return lttng_field_name_statedump(session, field, nesting); | |
3524 | } | |
3525 | ||
3526 | /* | |
3527 | * Must be called with sessions_mutex held. | |
3528 | */ | |
3529 | static | |
8cdc1a81 | 3530 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3531 | const struct lttng_kernel_type_common *type, |
3532 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3533 | size_t nesting) |
c099397a | 3534 | { |
c099397a | 3535 | int ret = 0; |
c099397a | 3536 | |
12bb2edb MD |
3537 | switch (type->type) { |
3538 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3539 | ret = _lttng_integer_type_statedump(session, |
3540 | lttng_kernel_get_type_integer(type), | |
3541 | parent_encoding, nesting); | |
8070f5c0 | 3542 | break; |
437d5aa5 MD |
3543 | case lttng_kernel_type_enum: |
3544 | ret = _lttng_enum_type_statedump(session, | |
3545 | lttng_kernel_get_type_enum(type), | |
3546 | nesting); | |
8070f5c0 | 3547 | break; |
12bb2edb | 3548 | case lttng_kernel_type_string: |
437d5aa5 MD |
3549 | ret = _lttng_string_type_statedump(session, |
3550 | lttng_kernel_get_type_string(type), | |
3551 | nesting); | |
ceabb767 | 3552 | break; |
437d5aa5 MD |
3553 | case lttng_kernel_type_struct: |
3554 | ret = _lttng_struct_type_statedump(session, | |
3555 | lttng_kernel_get_type_struct(type), | |
3556 | nesting); | |
8070f5c0 | 3557 | break; |
437d5aa5 MD |
3558 | case lttng_kernel_type_variant: |
3559 | ret = _lttng_variant_type_statedump(session, | |
3560 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3561 | nesting, NULL); |
ceabb767 MD |
3562 | break; |
3563 | ||
3564 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3565 | case lttng_kernel_type_array: |
3566 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3567 | default: |
3568 | WARN_ON_ONCE(1); | |
3569 | return -EINVAL; | |
8070f5c0 | 3570 | } |
ceabb767 MD |
3571 | return ret; |
3572 | } | |
8070f5c0 | 3573 | |
ceabb767 MD |
3574 | /* |
3575 | * Must be called with sessions_mutex held. | |
3576 | */ | |
3577 | static | |
8cdc1a81 | 3578 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3579 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3580 | size_t nesting, |
3581 | const char **prev_field_name_p) | |
ceabb767 | 3582 | { |
51ef4536 | 3583 | const char *prev_field_name = NULL; |
ceabb767 | 3584 | int ret = 0; |
27d2368e | 3585 | |
51ef4536 MD |
3586 | if (prev_field_name_p) |
3587 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3588 | switch (field->type->type) { |
12bb2edb | 3589 | case lttng_kernel_type_integer: |
ceabb767 MD |
3590 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3591 | break; | |
437d5aa5 | 3592 | case lttng_kernel_type_enum: |
ceabb767 | 3593 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3594 | break; |
12bb2edb | 3595 | case lttng_kernel_type_string: |
ceabb767 | 3596 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3597 | break; |
437d5aa5 | 3598 | case lttng_kernel_type_struct: |
ceabb767 | 3599 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3600 | break; |
437d5aa5 | 3601 | case lttng_kernel_type_array: |
ceabb767 | 3602 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3603 | break; |
437d5aa5 | 3604 | case lttng_kernel_type_sequence: |
51ef4536 | 3605 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3606 | break; |
437d5aa5 | 3607 | case lttng_kernel_type_variant: |
51ef4536 | 3608 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3609 | break; |
f513b2bf | 3610 | |
8070f5c0 MD |
3611 | default: |
3612 | WARN_ON_ONCE(1); | |
3613 | return -EINVAL; | |
3614 | } | |
51ef4536 MD |
3615 | if (prev_field_name_p) |
3616 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3617 | return ret; |
3618 | } | |
3619 | ||
3620 | static | |
8cdc1a81 | 3621 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3622 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3623 | { |
51ef4536 | 3624 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3625 | int ret = 0; |
3626 | int i; | |
3627 | ||
3628 | if (!ctx) | |
3629 | return 0; | |
3630 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3631 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3632 | |
51ef4536 | 3633 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3634 | if (ret) |
3635 | return ret; | |
3636 | } | |
3637 | return ret; | |
3638 | } | |
3639 | ||
3640 | static | |
8cdc1a81 | 3641 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3642 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3643 | { |
51ef4536 | 3644 | const char *prev_field_name = NULL; |
a67ba386 | 3645 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3646 | int ret = 0; |
3647 | int i; | |
3648 | ||
6c8c025b MD |
3649 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3650 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3651 | |
51ef4536 | 3652 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3653 | if (ret) |
3654 | return ret; | |
c099397a MD |
3655 | } |
3656 | return ret; | |
3657 | } | |
3658 | ||
d83004aa JD |
3659 | /* |
3660 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3661 | * The entire event metadata is printed as a single atomic metadata |
3662 | * transaction. | |
d83004aa | 3663 | */ |
c099397a | 3664 | static |
ee7e9a18 | 3665 | int _lttng_event_recorder_metadata_statedump(struct lttng_kernel_event_common *event) |
c099397a | 3666 | { |
ee7e9a18 MD |
3667 | struct lttng_kernel_event_recorder *event_recorder; |
3668 | struct lttng_kernel_channel_buffer *chan; | |
3669 | struct lttng_kernel_session *session; | |
c099397a MD |
3670 | int ret = 0; |
3671 | ||
ee7e9a18 MD |
3672 | if (event->type != LTTNG_KERNEL_EVENT_TYPE_RECORDER) |
3673 | return 0; | |
3674 | event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent); | |
3675 | chan = event_recorder->chan; | |
3676 | session = chan->parent.session; | |
3677 | ||
a67ba386 | 3678 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3679 | return 0; |
f7d06400 | 3680 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3681 | return 0; |
3682 | ||
8b97fd42 MD |
3683 | lttng_metadata_begin(session); |
3684 | ||
c099397a MD |
3685 | ret = lttng_metadata_printf(session, |
3686 | "event {\n" | |
ae734547 | 3687 | " name = \"%s\";\n" |
c099397a | 3688 | " id = %u;\n" |
b9074a1b | 3689 | " stream_id = %u;\n", |
a67ba386 MD |
3690 | event_recorder->priv->parent.desc->event_name, |
3691 | event_recorder->priv->id, | |
f7d06400 | 3692 | event_recorder->chan->priv->id); |
c099397a MD |
3693 | if (ret) |
3694 | goto end; | |
3695 | ||
8070f5c0 | 3696 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3697 | " fields := struct {\n" |
3698 | ); | |
3699 | if (ret) | |
3700 | goto end; | |
3701 | ||
a67ba386 | 3702 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3703 | if (ret) |
3704 | goto end; | |
3705 | ||
3706 | /* | |
3707 | * LTTng space reservation can only reserve multiples of the | |
3708 | * byte size. | |
3709 | */ | |
3710 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3711 | " };\n" |
3712 | "};\n\n"); | |
c099397a MD |
3713 | if (ret) |
3714 | goto end; | |
3715 | ||
a67ba386 | 3716 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3717 | end: |
8b97fd42 | 3718 | lttng_metadata_end(session); |
c099397a MD |
3719 | return ret; |
3720 | ||
3721 | } | |
3722 | ||
d83004aa JD |
3723 | /* |
3724 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3725 | * The entire channel metadata is printed as a single atomic metadata |
3726 | * transaction. | |
d83004aa | 3727 | */ |
c099397a | 3728 | static |
8cdc1a81 | 3729 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3730 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3731 | { |
3732 | int ret = 0; | |
3733 | ||
f7d06400 | 3734 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3735 | return 0; |
d83004aa | 3736 | |
f7d06400 | 3737 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3738 | return 0; |
3739 | ||
8b97fd42 MD |
3740 | lttng_metadata_begin(session); |
3741 | ||
f7d06400 | 3742 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3743 | ret = lttng_metadata_printf(session, |
3744 | "stream {\n" | |
3745 | " id = %u;\n" | |
9115fbdc | 3746 | " event.header := %s;\n" |
b9074a1b | 3747 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3748 | chan->priv->id, |
3749 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3750 | "struct event_header_large"); |
3751 | if (ret) | |
3752 | goto end; | |
3753 | ||
f7d06400 | 3754 | if (chan->priv->ctx) { |
b9074a1b MD |
3755 | ret = lttng_metadata_printf(session, |
3756 | " event.context := struct {\n"); | |
3757 | if (ret) | |
3758 | goto end; | |
3759 | } | |
f7d06400 | 3760 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3761 | if (ret) |
3762 | goto end; | |
f7d06400 | 3763 | if (chan->priv->ctx) { |
b9074a1b MD |
3764 | ret = lttng_metadata_printf(session, |
3765 | " };\n"); | |
3766 | if (ret) | |
3767 | goto end; | |
3768 | } | |
8070f5c0 MD |
3769 | |
3770 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3771 | "};\n\n"); |
8070f5c0 | 3772 | |
f7d06400 | 3773 | chan->priv->metadata_dumped = 1; |
c099397a | 3774 | end: |
8b97fd42 | 3775 | lttng_metadata_end(session); |
c099397a MD |
3776 | return ret; |
3777 | } | |
3778 | ||
d83004aa JD |
3779 | /* |
3780 | * Must be called with sessions_mutex held. | |
3781 | */ | |
9115fbdc | 3782 | static |
8cdc1a81 | 3783 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3784 | { |
3785 | return lttng_metadata_printf(session, | |
3786 | "struct packet_context {\n" | |
a3ccff4f MD |
3787 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3788 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3789 | " uint64_t content_size;\n" |
3790 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3791 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3792 | " unsigned long events_discarded;\n" |
9115fbdc | 3793 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3794 | "};\n\n" |
9115fbdc MD |
3795 | ); |
3796 | } | |
3797 | ||
3798 | /* | |
3799 | * Compact header: | |
3800 | * id: range: 0 - 30. | |
3801 | * id 31 is reserved to indicate an extended header. | |
3802 | * | |
3803 | * Large header: | |
3804 | * id: range: 0 - 65534. | |
3805 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3806 | * |
3807 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3808 | */ |
3809 | static | |
8cdc1a81 | 3810 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3811 | { |
3812 | return lttng_metadata_printf(session, | |
3813 | "struct event_header_compact {\n" | |
3814 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3815 | " variant <id> {\n" | |
3816 | " struct {\n" | |
a3ccff4f | 3817 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3818 | " } compact;\n" |
3819 | " struct {\n" | |
3820 | " uint32_t id;\n" | |
a3ccff4f | 3821 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3822 | " } extended;\n" |
3823 | " } v;\n" | |
3824 | "} align(%u);\n" | |
3825 | "\n" | |
3826 | "struct event_header_large {\n" | |
3827 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3828 | " variant <id> {\n" | |
3829 | " struct {\n" | |
a3ccff4f | 3830 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3831 | " } compact;\n" |
3832 | " struct {\n" | |
3833 | " uint32_t id;\n" | |
a3ccff4f | 3834 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3835 | " } extended;\n" |
3836 | " } v;\n" | |
3837 | "} align(%u);\n\n", | |
a90917c3 MD |
3838 | lttng_alignof(uint32_t) * CHAR_BIT, |
3839 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3840 | ); |
3841 | } | |
3842 | ||
a3ccff4f MD |
3843 | /* |
3844 | * Approximation of NTP time of day to clock monotonic correlation, | |
3845 | * taken at start of trace. | |
3846 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3847 | * in future versions. | |
5283350b MD |
3848 | * This function may return a negative offset. It may happen if the |
3849 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3850 | * |
3851 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3852 | * y2038 compliant. | |
a3ccff4f MD |
3853 | */ |
3854 | static | |
8967b2a3 | 3855 | int64_t measure_clock_offset(void) |
a3ccff4f | 3856 | { |
dcb93448 | 3857 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3858 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3859 | int64_t offset; |
a3ccff4f | 3860 | unsigned long flags; |
3636085f MJ |
3861 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3862 | struct timespec64 rts = { 0, 0 }; | |
3863 | #else | |
3864 | struct timespec rts = { 0, 0 }; | |
3865 | #endif | |
a3ccff4f MD |
3866 | |
3867 | /* Disable interrupts to increase correlation precision. */ | |
3868 | local_irq_save(flags); | |
3869 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3870 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3871 | ktime_get_real_ts64(&rts); | |
3872 | #else | |
216b6baa | 3873 | getnstimeofday(&rts); |
3636085f | 3874 | #endif |
a3ccff4f MD |
3875 | monotonic[1] = trace_clock_read64(); |
3876 | local_irq_restore(flags); | |
3877 | ||
dcb93448 | 3878 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3879 | realtime = (uint64_t) rts.tv_sec * tcf; |
3880 | if (tcf == NSEC_PER_SEC) { | |
3881 | realtime += rts.tv_nsec; | |
3882 | } else { | |
3883 | uint64_t n = rts.tv_nsec * tcf; | |
3884 | ||
3885 | do_div(n, NSEC_PER_SEC); | |
3886 | realtime += n; | |
3887 | } | |
dcb93448 | 3888 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3889 | return offset; |
3890 | } | |
3891 | ||
3eb95be4 | 3892 | static |
8cdc1a81 | 3893 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3894 | { |
0f3eaad4 | 3895 | int ret = 0; |
3eb95be4 JR |
3896 | size_t i; |
3897 | char cur; | |
3898 | ||
3899 | i = 0; | |
3900 | cur = string[i]; | |
3901 | while (cur != '\0') { | |
3902 | switch (cur) { | |
3903 | case '\n': | |
3904 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3905 | break; | |
3906 | case '\\': | |
3907 | case '"': | |
3908 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3909 | if (ret) | |
3910 | goto error; | |
3911 | /* We still print the current char */ | |
c190d76e | 3912 | lttng_fallthrough; |
3eb95be4 JR |
3913 | default: |
3914 | ret = lttng_metadata_printf(session, "%c", cur); | |
3915 | break; | |
3916 | } | |
3917 | ||
3918 | if (ret) | |
3919 | goto error; | |
3920 | ||
3921 | cur = string[++i]; | |
3922 | } | |
3923 | error: | |
3924 | return ret; | |
3925 | } | |
3926 | ||
3927 | static | |
8cdc1a81 | 3928 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3929 | const char *field_value) |
3eb95be4 JR |
3930 | { |
3931 | int ret; | |
3932 | ||
1c88f269 | 3933 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3934 | if (ret) |
3935 | goto error; | |
3936 | ||
1c88f269 | 3937 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3938 | if (ret) |
3939 | goto error; | |
3940 | ||
3941 | ret = lttng_metadata_printf(session, "\";\n"); | |
3942 | ||
3943 | error: | |
3944 | return ret; | |
3945 | } | |
3946 | ||
c099397a MD |
3947 | /* |
3948 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3949 | * Must be called with sessions_mutex held. |
c099397a MD |
3950 | */ |
3951 | static | |
8cdc1a81 | 3952 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3953 | { |
8cdc1a81 | 3954 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3955 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3956 | const char *product_uuid; |
f7d06400 | 3957 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3958 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3959 | int ret = 0; |
3960 | ||
585e5dcc | 3961 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3962 | return 0; |
8b97fd42 MD |
3963 | |
3964 | lttng_metadata_begin(session); | |
3965 | ||
8cdc1a81 | 3966 | if (session->priv->metadata_dumped) |
c099397a | 3967 | goto skip_session; |
c099397a | 3968 | |
d793d5e1 | 3969 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3970 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3971 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3972 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3973 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3974 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3975 | |
3976 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3977 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3978 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3979 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3980 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3981 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3982 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3983 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3984 | "\n" |
3985 | "trace {\n" | |
3986 | " major = %u;\n" | |
3987 | " minor = %u;\n" | |
30bdb6e4 | 3988 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3989 | " byte_order = %s;\n" |
3990 | " packet.header := struct {\n" | |
3991 | " uint32_t magic;\n" | |
1ec3f75a | 3992 | " uint8_t uuid[16];\n" |
d793d5e1 | 3993 | " uint32_t stream_id;\n" |
5594698f | 3994 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3995 | " };\n" |
d793d5e1 | 3996 | "};\n\n", |
a90917c3 MD |
3997 | lttng_alignof(uint8_t) * CHAR_BIT, |
3998 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3999 | lttng_alignof(uint32_t) * CHAR_BIT, | |
4000 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
4001 | sizeof(unsigned long) * CHAR_BIT, |
4002 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
4003 | CTF_SPEC_MAJOR, |
4004 | CTF_SPEC_MINOR, | |
d793d5e1 | 4005 | uuid_s, |
5214fa50 | 4006 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
4007 | "be" |
4008 | #else | |
4009 | "le" | |
4010 | #endif | |
4011 | ); | |
4012 | if (ret) | |
4013 | goto end; | |
4014 | ||
99dc9597 MD |
4015 | ret = lttng_metadata_printf(session, |
4016 | "env {\n" | |
a6058143 | 4017 | " hostname = \"%s\";\n" |
c6c9e10f | 4018 | " domain = \"kernel\";\n" |
99dc9597 | 4019 | " sysname = \"%s\";\n" |
c6c9e10f MD |
4020 | " kernel_release = \"%s\";\n" |
4021 | " kernel_version = \"%s\";\n" | |
4022 | " tracer_name = \"lttng-modules\";\n" | |
4023 | " tracer_major = %d;\n" | |
4024 | " tracer_minor = %d;\n" | |
4025 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 4026 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 4027 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
4028 | utsname()->sysname, |
4029 | utsname()->release, | |
c6c9e10f MD |
4030 | utsname()->version, |
4031 | LTTNG_MODULES_MAJOR_VERSION, | |
4032 | LTTNG_MODULES_MINOR_VERSION, | |
4033 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
4034 | ); |
4035 | if (ret) | |
4036 | goto end; | |
4037 | ||
8cdc1a81 | 4038 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
4039 | if (ret) |
4040 | goto end; | |
4041 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 4042 | session->priv->creation_time); |
3eb95be4 JR |
4043 | if (ret) |
4044 | goto end; | |
4045 | ||
c88f762e GB |
4046 | /* Add the product UUID to the 'env' section */ |
4047 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4048 | if (product_uuid) { | |
4049 | ret = lttng_metadata_printf(session, | |
4050 | " product_uuid = \"%s\";\n", | |
4051 | product_uuid | |
4052 | ); | |
4053 | if (ret) | |
4054 | goto end; | |
4055 | } | |
4056 | ||
4057 | /* Close the 'env' section */ | |
3eb95be4 JR |
4058 | ret = lttng_metadata_printf(session, "};\n\n"); |
4059 | if (ret) | |
4060 | goto end; | |
4061 | ||
a3ccff4f MD |
4062 | ret = lttng_metadata_printf(session, |
4063 | "clock {\n" | |
2754583e MD |
4064 | " name = \"%s\";\n", |
4065 | trace_clock_name() | |
a82c63f1 MD |
4066 | ); |
4067 | if (ret) | |
4068 | goto end; | |
4069 | ||
4070 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4071 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4072 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4073 | clock_uuid_s |
4074 | ); | |
4075 | if (ret) | |
4076 | goto end; | |
4077 | } | |
4078 | ||
4079 | ret = lttng_metadata_printf(session, | |
2754583e | 4080 | " description = \"%s\";\n" |
a3ccff4f MD |
4081 | " freq = %llu; /* Frequency, in Hz */\n" |
4082 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4083 | " offset = %lld;\n" |
a3ccff4f | 4084 | "};\n\n", |
2754583e | 4085 | trace_clock_description(), |
a3ccff4f | 4086 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4087 | (long long) measure_clock_offset() |
a3ccff4f MD |
4088 | ); |
4089 | if (ret) | |
4090 | goto end; | |
4091 | ||
4092 | ret = lttng_metadata_printf(session, | |
4093 | "typealias integer {\n" | |
4094 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4095 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4096 | "} := uint27_clock_monotonic_t;\n" |
4097 | "\n" | |
4098 | "typealias integer {\n" | |
4099 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4100 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4101 | "} := uint32_clock_monotonic_t;\n" |
4102 | "\n" | |
4103 | "typealias integer {\n" | |
4104 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4105 | " map = clock.%s.value;\n" |
a3ccff4f | 4106 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4107 | trace_clock_name(), |
a3ccff4f | 4108 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4109 | trace_clock_name(), |
4110 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4111 | trace_clock_name() | |
a3ccff4f MD |
4112 | ); |
4113 | if (ret) | |
4114 | goto end; | |
4115 | ||
a90917c3 | 4116 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4117 | if (ret) |
4118 | goto end; | |
4119 | ||
a90917c3 | 4120 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4121 | if (ret) |
4122 | goto end; | |
4123 | ||
c099397a | 4124 | skip_session: |
f7d06400 MD |
4125 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4126 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4127 | if (ret) |
4128 | goto end; | |
4129 | } | |
4130 | ||
f237aef8 | 4131 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
ee7e9a18 | 4132 | ret = _lttng_event_recorder_metadata_statedump(&event_recorder_priv->pub->parent); |
c099397a MD |
4133 | if (ret) |
4134 | goto end; | |
4135 | } | |
8cdc1a81 | 4136 | session->priv->metadata_dumped = 1; |
c099397a | 4137 | end: |
8b97fd42 | 4138 | lttng_metadata_end(session); |
c099397a MD |
4139 | return ret; |
4140 | } | |
4141 | ||
c0e31d2e | 4142 | /** |
a90917c3 | 4143 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4144 | * @transport: transport structure |
4145 | * | |
4146 | * Registers a transport which can be used as output to extract the data out of | |
4147 | * LTTng. The module calling this registration function must ensure that no | |
4148 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4149 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4150 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4151 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4152 | * after its registration must it synchronize the TLBs. |
4153 | */ | |
a90917c3 | 4154 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4155 | { |
4156 | /* | |
4157 | * Make sure no page fault can be triggered by the module about to be | |
4158 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4159 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4160 | */ |
263b6c88 | 4161 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4162 | |
4163 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4164 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4165 | mutex_unlock(&sessions_mutex); |
4166 | } | |
a90917c3 | 4167 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4168 | |
4169 | /** | |
a90917c3 | 4170 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4171 | * @transport: transport structure |
4172 | */ | |
a90917c3 | 4173 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4174 | { |
4175 | mutex_lock(&sessions_mutex); | |
4176 | list_del(&transport->node); | |
4177 | mutex_unlock(&sessions_mutex); | |
4178 | } | |
a90917c3 | 4179 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4180 | |
a101fa10 MD |
4181 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4182 | { | |
4183 | /* | |
4184 | * Make sure no page fault can be triggered by the module about to be | |
4185 | * registered. We deal with this here so we don't have to call | |
4186 | * vmalloc_sync_mappings() in each module's init. | |
4187 | */ | |
4188 | wrapper_vmalloc_sync_mappings(); | |
4189 | ||
4190 | mutex_lock(&sessions_mutex); | |
4191 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4192 | mutex_unlock(&sessions_mutex); | |
4193 | } | |
4194 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4195 | ||
4196 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4197 | { | |
4198 | mutex_lock(&sessions_mutex); | |
4199 | list_del(&transport->node); | |
4200 | mutex_unlock(&sessions_mutex); | |
4201 | } | |
4202 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4203 | ||
5f4c791e | 4204 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4205 | |
4206 | enum cpuhp_state lttng_hp_prepare; | |
4207 | enum cpuhp_state lttng_hp_online; | |
4208 | ||
4209 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4210 | { | |
4211 | struct lttng_cpuhp_node *lttng_node; | |
4212 | ||
4213 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4214 | switch (lttng_node->component) { | |
4215 | case LTTNG_RING_BUFFER_FRONTEND: | |
4216 | return 0; | |
4217 | case LTTNG_RING_BUFFER_BACKEND: | |
4218 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4219 | case LTTNG_RING_BUFFER_ITER: | |
4220 | return 0; | |
4221 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4222 | return 0; | |
4223 | default: | |
4224 | return -EINVAL; | |
4225 | } | |
4226 | } | |
4227 | ||
4228 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4229 | { | |
4230 | struct lttng_cpuhp_node *lttng_node; | |
4231 | ||
4232 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4233 | switch (lttng_node->component) { | |
4234 | case LTTNG_RING_BUFFER_FRONTEND: | |
4235 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4236 | case LTTNG_RING_BUFFER_BACKEND: | |
4237 | return 0; | |
4238 | case LTTNG_RING_BUFFER_ITER: | |
4239 | return 0; | |
4240 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4241 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4242 | default: | |
4243 | return -EINVAL; | |
4244 | } | |
4245 | } | |
4246 | ||
4247 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4248 | { | |
4249 | struct lttng_cpuhp_node *lttng_node; | |
4250 | ||
4251 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4252 | switch (lttng_node->component) { | |
4253 | case LTTNG_RING_BUFFER_FRONTEND: | |
4254 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4255 | case LTTNG_RING_BUFFER_BACKEND: | |
4256 | return 0; | |
4257 | case LTTNG_RING_BUFFER_ITER: | |
4258 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4259 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4260 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4261 | default: | |
4262 | return -EINVAL; | |
4263 | } | |
4264 | } | |
4265 | ||
4266 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4267 | { | |
4268 | struct lttng_cpuhp_node *lttng_node; | |
4269 | ||
4270 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4271 | switch (lttng_node->component) { | |
4272 | case LTTNG_RING_BUFFER_FRONTEND: | |
4273 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4274 | case LTTNG_RING_BUFFER_BACKEND: | |
4275 | return 0; | |
4276 | case LTTNG_RING_BUFFER_ITER: | |
4277 | return 0; | |
4278 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4279 | return 0; | |
4280 | default: | |
4281 | return -EINVAL; | |
4282 | } | |
4283 | } | |
4284 | ||
4285 | static int __init lttng_init_cpu_hotplug(void) | |
4286 | { | |
4287 | int ret; | |
4288 | ||
4289 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4290 | lttng_hotplug_prepare, | |
4291 | lttng_hotplug_dead); | |
4292 | if (ret < 0) { | |
4293 | return ret; | |
4294 | } | |
4295 | lttng_hp_prepare = ret; | |
4296 | lttng_rb_set_hp_prepare(ret); | |
4297 | ||
4298 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4299 | lttng_hotplug_online, | |
4300 | lttng_hotplug_offline); | |
4301 | if (ret < 0) { | |
4302 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4303 | lttng_hp_prepare = 0; | |
4304 | return ret; | |
4305 | } | |
4306 | lttng_hp_online = ret; | |
4307 | lttng_rb_set_hp_online(ret); | |
4308 | ||
4309 | return 0; | |
4310 | } | |
4311 | ||
4312 | static void __exit lttng_exit_cpu_hotplug(void) | |
4313 | { | |
4314 | lttng_rb_set_hp_online(0); | |
4315 | cpuhp_remove_multi_state(lttng_hp_online); | |
4316 | lttng_rb_set_hp_prepare(0); | |
4317 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4318 | } | |
4319 | ||
5f4c791e | 4320 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4321 | static int lttng_init_cpu_hotplug(void) |
4322 | { | |
4323 | return 0; | |
4324 | } | |
4325 | static void lttng_exit_cpu_hotplug(void) | |
4326 | { | |
4327 | } | |
5f4c791e | 4328 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4329 | |
a90917c3 | 4330 | static int __init lttng_events_init(void) |
4e3c1b9b | 4331 | { |
1c25284c MD |
4332 | int ret; |
4333 | ||
453b2495 JD |
4334 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4335 | if (ret) | |
4336 | return ret; | |
389d7070 | 4337 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4338 | if (ret) |
4339 | return ret; | |
4340 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4341 | if (ret) |
4342 | return ret; | |
4343 | ret = lttng_probes_init(); | |
389d7070 MD |
4344 | if (ret) |
4345 | return ret; | |
07dfc1d0 | 4346 | ret = lttng_context_init(); |
20591cf7 MD |
4347 | if (ret) |
4348 | return ret; | |
07dfc1d0 MD |
4349 | ret = lttng_tracepoint_init(); |
4350 | if (ret) | |
4351 | goto error_tp; | |
a67ba386 MD |
4352 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4353 | if (!event_recorder_cache) { | |
20591cf7 | 4354 | ret = -ENOMEM; |
a67ba386 | 4355 | goto error_kmem_event_recorder; |
dffef45d | 4356 | } |
a67ba386 MD |
4357 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4358 | if (!event_recorder_private_cache) { | |
4359 | ret = -ENOMEM; | |
4360 | goto error_kmem_event_recorder_private; | |
4361 | } | |
4362 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4363 | if (!event_notifier_cache) { |
4364 | ret = -ENOMEM; | |
4365 | goto error_kmem_event_notifier; | |
20591cf7 | 4366 | } |
a67ba386 MD |
4367 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4368 | if (!event_notifier_private_cache) { | |
4369 | ret = -ENOMEM; | |
4370 | goto error_kmem_event_notifier_private; | |
4371 | } | |
80996790 | 4372 | ret = lttng_abi_init(); |
02119ee5 MD |
4373 | if (ret) |
4374 | goto error_abi; | |
0c956676 MD |
4375 | ret = lttng_logger_init(); |
4376 | if (ret) | |
4377 | goto error_logger; | |
1e367326 MD |
4378 | ret = lttng_init_cpu_hotplug(); |
4379 | if (ret) | |
4380 | goto error_hotplug; | |
101215b7 | 4381 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4382 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4383 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4384 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4385 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4386 | LTTNG_VERSION_NAME, |
4387 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4388 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4389 | #else | |
4390 | "", | |
4391 | #endif | |
4392 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4393 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4394 | #else | |
4395 | ""); | |
4396 | #endif | |
c1551e57 MJ |
4397 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4398 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4399 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4400 | return 0; |
0c956676 | 4401 | |
1e367326 MD |
4402 | error_hotplug: |
4403 | lttng_logger_exit(); | |
0c956676 MD |
4404 | error_logger: |
4405 | lttng_abi_exit(); | |
02119ee5 | 4406 | error_abi: |
a67ba386 MD |
4407 | kmem_cache_destroy(event_notifier_private_cache); |
4408 | error_kmem_event_notifier_private: | |
dffef45d FD |
4409 | kmem_cache_destroy(event_notifier_cache); |
4410 | error_kmem_event_notifier: | |
a67ba386 MD |
4411 | kmem_cache_destroy(event_recorder_private_cache); |
4412 | error_kmem_event_recorder_private: | |
4413 | kmem_cache_destroy(event_recorder_cache); | |
4414 | error_kmem_event_recorder: | |
20591cf7 | 4415 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4416 | error_tp: |
4417 | lttng_context_exit(); | |
101215b7 | 4418 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4419 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4420 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4421 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4422 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4423 | LTTNG_VERSION_NAME, |
4424 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4425 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4426 | #else | |
4427 | "", | |
4428 | #endif | |
4429 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4430 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4431 | #else | |
4432 | ""); | |
4433 | #endif | |
1c25284c | 4434 | return ret; |
4e3c1b9b MD |
4435 | } |
4436 | ||
a90917c3 | 4437 | module_init(lttng_events_init); |
11b5a3c2 | 4438 | |
a90917c3 | 4439 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4440 | { |
8cdc1a81 | 4441 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4442 | |
1e367326 | 4443 | lttng_exit_cpu_hotplug(); |
0c956676 | 4444 | lttng_logger_exit(); |
80996790 | 4445 | lttng_abi_exit(); |
8cdc1a81 MD |
4446 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4447 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4448 | kmem_cache_destroy(event_recorder_cache); |
4449 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4450 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4451 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4452 | lttng_tracepoint_exit(); |
07dfc1d0 | 4453 | lttng_context_exit(); |
101215b7 | 4454 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4455 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4456 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4457 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4458 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4459 | LTTNG_VERSION_NAME, |
4460 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4461 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4462 | #else | |
4463 | "", | |
4464 | #endif | |
4465 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4466 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4467 | #else | |
4468 | ""); | |
4469 | #endif | |
4e3c1b9b | 4470 | } |
92e94819 | 4471 | |
a90917c3 | 4472 | module_exit(lttng_events_exit); |
11b5a3c2 | 4473 | |
7ca11e77 | 4474 | #include <generated/patches.h> |
101215b7 MJ |
4475 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4476 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4477 | #endif | |
4478 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4479 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4480 | #endif | |
92e94819 MD |
4481 | MODULE_LICENSE("GPL and additional rights"); |
4482 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4483 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4484 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4485 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4486 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4487 | LTTNG_MODULES_EXTRAVERSION); |