Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
8c6e7f13 | 27 | #include <linux/uaccess.h> |
a606b6e8 | 28 | #include <linux/vmalloc.h> |
c88f762e | 29 | #include <linux/dmi.h> |
3c997079 | 30 | |
c570be0d | 31 | #include <wrapper/compiler_attributes.h> |
a7008254 | 32 | #include <wrapper/uuid.h> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
34 | #include <wrapper/random.h> |
35 | #include <wrapper/tracepoint.h> | |
36 | #include <wrapper/list.h> | |
cbc19040 | 37 | #include <wrapper/types.h> |
2df37e95 MD |
38 | #include <lttng/kernel-version.h> |
39 | #include <lttng/events.h> | |
92bc1e23 | 40 | #include <lttng/events-internal.h> |
0b365677 | 41 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 42 | #include <lttng/tracer.h> |
21f58fb7 | 43 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
44 | #include <lttng/abi-old.h> |
45 | #include <lttng/endian.h> | |
46 | #include <lttng/string-utils.h> | |
4a11ef1c | 47 | #include <lttng/utils.h> |
24591303 MD |
48 | #include <ringbuffer/backend.h> |
49 | #include <ringbuffer/frontend.h> | |
3636085f | 50 | #include <wrapper/time.h> |
4e3c1b9b | 51 | |
a029f2a3 MJ |
52 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0)) |
53 | #include <linux/stdarg.h> | |
54 | #else | |
55 | #include <stdarg.h> | |
56 | #endif | |
57 | ||
d83004aa JD |
58 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
59 | ||
4e3c1b9b | 60 | static LIST_HEAD(sessions); |
750b05f2 | 61 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 62 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 63 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
64 | /* |
65 | * Protect the sessions and metadata caches. | |
66 | */ | |
4e3c1b9b | 67 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
68 | static struct kmem_cache *event_recorder_cache; |
69 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 70 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 71 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 72 | |
a40e3229 MD |
73 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
74 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b2bc0bc8 | 75 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); |
dffef45d | 76 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 77 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 78 | |
0648898e | 79 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
ac847066 | 80 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
38b35aff MD |
81 | static void _lttng_event_unregister(struct lttng_kernel_event_recorder *event); |
82 | static void _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier); | |
c099397a | 83 | static |
a40e3229 | 84 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 85 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 86 | struct lttng_kernel_event_recorder *event); |
c099397a | 87 | static |
a40e3229 | 88 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
89 | static |
90 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 91 | static |
a40e3229 | 92 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
93 | const struct lttng_kernel_type_common *type, |
94 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
95 | size_t nesting); |
96 | static | |
a40e3229 | 97 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 98 | const struct lttng_kernel_event_field *field, |
f0039724 | 99 | size_t nesting, const char **prev_field_name_p); |
c099397a | 100 | |
c099397a | 101 | void synchronize_trace(void) |
abcca994 | 102 | { |
57acf405 MJ |
103 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
104 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
105 | synchronize_rcu(); |
106 | #else | |
abcca994 | 107 | synchronize_sched(); |
92da05ce MJ |
108 | #endif |
109 | ||
5f4c791e | 110 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
111 | #ifdef CONFIG_PREEMPT_RT_FULL |
112 | synchronize_rcu(); | |
113 | #endif | |
5f4c791e | 114 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
115 | #ifdef CONFIG_PREEMPT_RT |
116 | synchronize_rcu(); | |
117 | #endif | |
5f4c791e | 118 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
119 | } |
120 | ||
3c997079 MD |
121 | void lttng_lock_sessions(void) |
122 | { | |
123 | mutex_lock(&sessions_mutex); | |
124 | } | |
125 | ||
126 | void lttng_unlock_sessions(void) | |
127 | { | |
128 | mutex_unlock(&sessions_mutex); | |
129 | } | |
130 | ||
9fe593d2 FD |
131 | static struct lttng_transport *lttng_transport_find(const char *name) |
132 | { | |
133 | struct lttng_transport *transport; | |
134 | ||
135 | list_for_each_entry(transport, <tng_transport_list, node) { | |
136 | if (!strcmp(transport->name, name)) | |
137 | return transport; | |
138 | } | |
139 | return NULL; | |
140 | } | |
141 | ||
3c997079 MD |
142 | /* |
143 | * Called with sessions lock held. | |
144 | */ | |
145 | int lttng_session_active(void) | |
146 | { | |
a40e3229 | 147 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
148 | |
149 | list_for_each_entry(iter, &sessions, list) { | |
a40e3229 | 150 | if (iter->pub->active) |
3c997079 MD |
151 | return 1; |
152 | } | |
153 | return 0; | |
154 | } | |
155 | ||
a40e3229 | 156 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 157 | { |
a40e3229 MD |
158 | struct lttng_kernel_session *session; |
159 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 160 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 161 | int i; |
4e3c1b9b MD |
162 | |
163 | mutex_lock(&sessions_mutex); | |
a40e3229 | 164 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 165 | if (!session) |
d83004aa | 166 | goto err; |
a40e3229 MD |
167 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
168 | if (!session_priv) | |
169 | goto err_free_session; | |
170 | session->priv = session_priv; | |
171 | session_priv->pub = session; | |
172 | ||
173 | INIT_LIST_HEAD(&session_priv->chan); | |
174 | INIT_LIST_HEAD(&session_priv->events); | |
175 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
176 | |
177 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
178 | GFP_KERNEL); | |
179 | if (!metadata_cache) | |
a40e3229 | 180 | goto err_free_session_private; |
0ca42eb7 | 181 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
182 | if (!metadata_cache->data) |
183 | goto err_free_cache; | |
184 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
185 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 186 | mutex_init(&metadata_cache->lock); |
a40e3229 | 187 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 188 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
a40e3229 | 189 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 190 | sizeof(metadata_cache->uuid)); |
a40e3229 | 191 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 192 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
a40e3229 MD |
193 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
194 | list_add(&session_priv->list, &sessions); | |
195 | ||
a2fa977a MD |
196 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
197 | goto tracker_alloc_error; | |
198 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
199 | goto tracker_alloc_error; | |
200 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
201 | goto tracker_alloc_error; | |
202 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
203 | goto tracker_alloc_error; | |
204 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
205 | goto tracker_alloc_error; | |
206 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
207 | goto tracker_alloc_error; | |
208 | ||
4e3c1b9b | 209 | mutex_unlock(&sessions_mutex); |
a40e3229 | 210 | |
4e3c1b9b | 211 | return session; |
d83004aa | 212 | |
a2fa977a MD |
213 | tracker_alloc_error: |
214 | lttng_id_tracker_fini(&session->pid_tracker); | |
215 | lttng_id_tracker_fini(&session->vpid_tracker); | |
216 | lttng_id_tracker_fini(&session->uid_tracker); | |
217 | lttng_id_tracker_fini(&session->vuid_tracker); | |
218 | lttng_id_tracker_fini(&session->gid_tracker); | |
219 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
220 | err_free_cache: |
221 | kfree(metadata_cache); | |
a40e3229 MD |
222 | err_free_session_private: |
223 | lttng_kvfree(session_priv); | |
d83004aa | 224 | err_free_session: |
48f5e0b5 | 225 | lttng_kvfree(session); |
d83004aa JD |
226 | err: |
227 | mutex_unlock(&sessions_mutex); | |
228 | return NULL; | |
229 | } | |
230 | ||
99f52fcc FD |
231 | static |
232 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
233 | { | |
234 | struct lttng_counter_transport *transport; | |
235 | ||
236 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
237 | if (!strcmp(transport->name, name)) | |
238 | return transport; | |
239 | } | |
240 | return NULL; | |
241 | } | |
242 | ||
243 | struct lttng_counter *lttng_kernel_counter_create( | |
244 | const char *counter_transport_name, | |
245 | size_t number_dimensions, const size_t *dimensions_sizes) | |
246 | { | |
247 | struct lttng_counter *counter = NULL; | |
248 | struct lttng_counter_transport *counter_transport = NULL; | |
249 | ||
250 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
251 | if (!counter_transport) { | |
252 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
253 | counter_transport_name); | |
254 | goto notransport; | |
255 | } | |
256 | if (!try_module_get(counter_transport->owner)) { | |
257 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
258 | goto notransport; | |
259 | } | |
260 | ||
261 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
262 | if (!counter) | |
263 | goto nomem; | |
264 | ||
265 | /* Create event notifier error counter. */ | |
266 | counter->ops = &counter_transport->ops; | |
267 | counter->transport = counter_transport; | |
268 | ||
269 | counter->counter = counter->ops->counter_create( | |
270 | number_dimensions, dimensions_sizes, 0); | |
271 | if (!counter->counter) { | |
272 | goto create_error; | |
273 | } | |
274 | ||
275 | return counter; | |
276 | ||
277 | create_error: | |
278 | lttng_kvfree(counter); | |
279 | nomem: | |
280 | if (counter_transport) | |
281 | module_put(counter_transport->owner); | |
282 | notransport: | |
283 | return NULL; | |
284 | } | |
285 | ||
750b05f2 FD |
286 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
287 | { | |
288 | struct lttng_transport *transport = NULL; | |
289 | struct lttng_event_notifier_group *event_notifier_group; | |
290 | const char *transport_name = "relay-event-notifier"; | |
291 | size_t subbuf_size = 4096; //TODO | |
292 | size_t num_subbuf = 16; //TODO | |
293 | unsigned int switch_timer_interval = 0; | |
294 | unsigned int read_timer_interval = 0; | |
dffef45d | 295 | int i; |
750b05f2 FD |
296 | |
297 | mutex_lock(&sessions_mutex); | |
298 | ||
299 | transport = lttng_transport_find(transport_name); | |
300 | if (!transport) { | |
301 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
302 | transport_name); | |
303 | goto notransport; | |
304 | } | |
305 | if (!try_module_get(transport->owner)) { | |
306 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
307 | transport_name); | |
308 | goto notransport; | |
309 | } | |
310 | ||
311 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
312 | GFP_KERNEL); | |
313 | if (!event_notifier_group) | |
314 | goto nomem; | |
315 | ||
316 | /* | |
317 | * Initialize the ring buffer used to store event notifier | |
318 | * notifications. | |
319 | */ | |
320 | event_notifier_group->ops = &transport->ops; | |
da1fe18f | 321 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
322 | transport_name, event_notifier_group, NULL, |
323 | subbuf_size, num_subbuf, switch_timer_interval, | |
324 | read_timer_interval); | |
325 | if (!event_notifier_group->chan) | |
326 | goto create_error; | |
327 | ||
328 | event_notifier_group->transport = transport; | |
dffef45d FD |
329 | |
330 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
331 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
332 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
333 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
334 | ||
750b05f2 FD |
335 | list_add(&event_notifier_group->node, &event_notifier_groups); |
336 | ||
337 | mutex_unlock(&sessions_mutex); | |
338 | ||
339 | return event_notifier_group; | |
340 | ||
341 | create_error: | |
342 | lttng_kvfree(event_notifier_group); | |
343 | nomem: | |
344 | if (transport) | |
345 | module_put(transport->owner); | |
346 | notransport: | |
347 | mutex_unlock(&sessions_mutex); | |
348 | return NULL; | |
349 | } | |
350 | ||
d83004aa JD |
351 | void metadata_cache_destroy(struct kref *kref) |
352 | { | |
353 | struct lttng_metadata_cache *cache = | |
354 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 355 | vfree(cache->data); |
d83004aa | 356 | kfree(cache); |
4e3c1b9b MD |
357 | } |
358 | ||
a40e3229 | 359 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 360 | { |
ac847066 | 361 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 362 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 363 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 364 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 365 | int ret; |
4e3c1b9b MD |
366 | |
367 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 368 | WRITE_ONCE(session->active, 0); |
ac847066 MD |
369 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
370 | ret = lttng_syscalls_unregister_channel(chan_priv->pub); | |
1ec65de1 MD |
371 | WARN_ON(ret); |
372 | } | |
38b35aff MD |
373 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) |
374 | _lttng_event_unregister(event_recorder_priv->pub); | |
abcca994 | 375 | synchronize_trace(); /* Wait for in-flight events to complete */ |
ac847066 MD |
376 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
377 | ret = lttng_syscalls_destroy_event(chan_priv->pub); | |
badfe9f5 MD |
378 | WARN_ON(ret); |
379 | } | |
b2bc0bc8 | 380 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
a40e3229 | 381 | &session->priv->enablers_head, node) |
b2bc0bc8 | 382 | lttng_event_enabler_destroy(event_enabler); |
a40e3229 | 383 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node) |
0648898e | 384 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
ac847066 MD |
385 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
386 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
387 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 388 | } |
a40e3229 MD |
389 | mutex_lock(&session->priv->metadata_cache->lock); |
390 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 391 | _lttng_metadata_channel_hangup(metadata_stream); |
a40e3229 | 392 | mutex_unlock(&session->priv->metadata_cache->lock); |
a2fa977a MD |
393 | lttng_id_tracker_fini(&session->pid_tracker); |
394 | lttng_id_tracker_fini(&session->vpid_tracker); | |
395 | lttng_id_tracker_fini(&session->uid_tracker); | |
396 | lttng_id_tracker_fini(&session->vuid_tracker); | |
397 | lttng_id_tracker_fini(&session->gid_tracker); | |
398 | lttng_id_tracker_fini(&session->vgid_tracker); | |
a40e3229 MD |
399 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
400 | list_del(&session->priv->list); | |
4e3c1b9b | 401 | mutex_unlock(&sessions_mutex); |
a40e3229 | 402 | lttng_kvfree(session->priv); |
48f5e0b5 | 403 | lttng_kvfree(session); |
4e3c1b9b MD |
404 | } |
405 | ||
dffef45d FD |
406 | void lttng_event_notifier_group_destroy( |
407 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 408 | { |
dffef45d | 409 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
a67ba386 | 410 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
411 | int ret; |
412 | ||
750b05f2 FD |
413 | if (!event_notifier_group) |
414 | return; | |
415 | ||
416 | mutex_lock(&sessions_mutex); | |
dffef45d | 417 | |
3b82c4e1 | 418 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
419 | WARN_ON(ret); |
420 | ||
a67ba386 | 421 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
38b35aff MD |
422 | &event_notifier_group->event_notifiers_head, node) |
423 | _lttng_event_notifier_unregister(event_notifier_priv->pub); | |
dffef45d | 424 | |
b01155ba FD |
425 | /* Wait for in-flight event notifier to complete */ |
426 | synchronize_trace(); | |
427 | ||
21f58fb7 FD |
428 | irq_work_sync(&event_notifier_group->wakeup_pending); |
429 | ||
8a8ac9a8 FD |
430 | kfree(event_notifier_group->sc_filter); |
431 | ||
dffef45d FD |
432 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
433 | &event_notifier_group->enablers_head, node) | |
434 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
435 | ||
a67ba386 MD |
436 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
437 | &event_notifier_group->event_notifiers_head, node) | |
0648898e | 438 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 439 | |
99f52fcc FD |
440 | if (event_notifier_group->error_counter) { |
441 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 442 | |
99f52fcc FD |
443 | error_counter->ops->counter_destroy(error_counter->counter); |
444 | module_put(error_counter->transport->owner); | |
445 | lttng_kvfree(error_counter); | |
446 | event_notifier_group->error_counter = NULL; | |
447 | } | |
448 | ||
da1fe18f | 449 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
450 | module_put(event_notifier_group->transport->owner); |
451 | list_del(&event_notifier_group->node); | |
dffef45d | 452 | |
750b05f2 FD |
453 | mutex_unlock(&sessions_mutex); |
454 | lttng_kvfree(event_notifier_group); | |
455 | } | |
456 | ||
a40e3229 | 457 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
458 | { |
459 | int ret; | |
460 | ||
461 | mutex_lock(&sessions_mutex); | |
462 | ret = lttng_statedump_start(session); | |
463 | mutex_unlock(&sessions_mutex); | |
464 | return ret; | |
465 | } | |
466 | ||
a40e3229 | 467 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
468 | { |
469 | int ret = 0; | |
ac847066 | 470 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
471 | |
472 | mutex_lock(&sessions_mutex); | |
473 | if (session->active) { | |
474 | ret = -EBUSY; | |
475 | goto end; | |
476 | } | |
c099397a | 477 | |
3c997079 | 478 | /* Set transient enabler state to "enabled" */ |
a40e3229 | 479 | session->priv->tstate = 1; |
3c997079 | 480 | |
4ef81e4a | 481 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 482 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 483 | |
c099397a MD |
484 | /* |
485 | * Snapshot the number of events per channel to know the type of header | |
486 | * we need to use. | |
487 | */ | |
ac847066 MD |
488 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
489 | if (chan_priv->header_type) | |
490 | continue; /* don't change it if session stop/restart */ | |
491 | if (chan_priv->free_event_id < 31) | |
492 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 493 | else |
ac847066 | 494 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
495 | } |
496 | ||
64af2437 | 497 | /* Clear each stream's quiescent state. */ |
ac847066 MD |
498 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
499 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
500 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 501 | } |
64af2437 | 502 | |
a8f2d0c7 | 503 | WRITE_ONCE(session->active, 1); |
a40e3229 | 504 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 505 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 506 | if (ret) { |
a8f2d0c7 | 507 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
508 | goto end; |
509 | } | |
510 | ret = lttng_statedump_start(session); | |
360f38ea | 511 | if (ret) |
a8f2d0c7 | 512 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
513 | end: |
514 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 515 | return ret; |
c0e31d2e MD |
516 | } |
517 | ||
a40e3229 | 518 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
519 | { |
520 | int ret = 0; | |
ac847066 | 521 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
522 | |
523 | mutex_lock(&sessions_mutex); | |
524 | if (!session->active) { | |
525 | ret = -EBUSY; | |
526 | goto end; | |
527 | } | |
a8f2d0c7 | 528 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
529 | |
530 | /* Set transient enabler state to "disabled" */ | |
a40e3229 | 531 | session->priv->tstate = 0; |
b2bc0bc8 | 532 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
533 | |
534 | /* Set each stream's quiescent state. */ | |
ac847066 MD |
535 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
536 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
537 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 538 | } |
c0e31d2e MD |
539 | end: |
540 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 541 | return ret; |
c0e31d2e MD |
542 | } |
543 | ||
a40e3229 | 544 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
545 | { |
546 | int ret = 0; | |
ac847066 | 547 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 548 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
a40e3229 | 549 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
550 | struct lttng_metadata_stream *stream; |
551 | ||
552 | mutex_lock(&sessions_mutex); | |
553 | if (!session->active) { | |
554 | ret = -EBUSY; | |
555 | goto end; | |
556 | } | |
557 | ||
558 | mutex_lock(&cache->lock); | |
559 | memset(cache->data, 0, cache->cache_alloc); | |
560 | cache->metadata_written = 0; | |
561 | cache->version++; | |
a40e3229 | 562 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
563 | stream->metadata_out = 0; |
564 | stream->metadata_in = 0; | |
565 | } | |
566 | mutex_unlock(&cache->lock); | |
567 | ||
a40e3229 | 568 | session->priv->metadata_dumped = 0; |
ac847066 MD |
569 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
570 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
571 | } |
572 | ||
a40e3229 | 573 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 574 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
575 | } |
576 | ||
577 | ret = _lttng_session_metadata_statedump(session); | |
578 | ||
579 | end: | |
580 | mutex_unlock(&sessions_mutex); | |
581 | return ret; | |
582 | } | |
583 | ||
ac847066 | 584 | int lttng_channel_enable(struct lttng_kernel_channel_buffer *channel) |
e64957da | 585 | { |
3c997079 | 586 | int ret = 0; |
e64957da | 587 | |
3c997079 | 588 | mutex_lock(&sessions_mutex); |
ac847066 | 589 | if (channel->priv->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
590 | ret = -EPERM; |
591 | goto end; | |
592 | } | |
ac847066 | 593 | if (channel->parent.enabled) { |
3c997079 MD |
594 | ret = -EEXIST; |
595 | goto end; | |
596 | } | |
597 | /* Set transient enabler state to "enabled" */ | |
ac847066 MD |
598 | channel->priv->parent.tstate = 1; |
599 | lttng_session_sync_event_enablers(channel->parent.session); | |
3c997079 | 600 | /* Set atomically the state to "enabled" */ |
ac847066 | 601 | WRITE_ONCE(channel->parent.enabled, 1); |
3c997079 MD |
602 | end: |
603 | mutex_unlock(&sessions_mutex); | |
604 | return ret; | |
e64957da MD |
605 | } |
606 | ||
ac847066 | 607 | int lttng_channel_disable(struct lttng_kernel_channel_buffer *channel) |
e64957da | 608 | { |
3c997079 | 609 | int ret = 0; |
e64957da | 610 | |
3c997079 | 611 | mutex_lock(&sessions_mutex); |
ac847066 | 612 | if (channel->priv->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
613 | ret = -EPERM; |
614 | goto end; | |
615 | } | |
ac847066 | 616 | if (!channel->parent.enabled) { |
3c997079 MD |
617 | ret = -EEXIST; |
618 | goto end; | |
619 | } | |
620 | /* Set atomically the state to "disabled" */ | |
ac847066 | 621 | WRITE_ONCE(channel->parent.enabled, 0); |
3c997079 | 622 | /* Set transient enabler state to "enabled" */ |
ac847066 MD |
623 | channel->priv->parent.tstate = 0; |
624 | lttng_session_sync_event_enablers(channel->parent.session); | |
3c997079 MD |
625 | end: |
626 | mutex_unlock(&sessions_mutex); | |
627 | return ret; | |
e64957da MD |
628 | } |
629 | ||
9d993668 | 630 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 631 | { |
3c997079 | 632 | int ret = 0; |
e64957da | 633 | |
3c997079 | 634 | mutex_lock(&sessions_mutex); |
9d993668 MD |
635 | switch (event->type) { |
636 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
637 | { | |
638 | struct lttng_kernel_event_recorder *event_recorder = | |
639 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
640 | ||
ac847066 | 641 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
642 | ret = -EPERM; |
643 | goto end; | |
644 | } | |
a0493bef | 645 | break; |
9d993668 MD |
646 | } |
647 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
648 | switch (event->priv->instrumentation) { | |
649 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
650 | ret = -EINVAL; | |
651 | goto end; | |
652 | default: | |
653 | break; | |
654 | } | |
a0493bef MD |
655 | break; |
656 | default: | |
9d993668 | 657 | break; |
a0493bef | 658 | } |
e64957da | 659 | |
9d993668 | 660 | if (event->enabled) { |
3c997079 MD |
661 | ret = -EEXIST; |
662 | goto end; | |
663 | } | |
a67ba386 | 664 | switch (event->priv->instrumentation) { |
c570be0d MJ |
665 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
666 | lttng_fallthrough; | |
606828e4 | 667 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
668 | ret = -EINVAL; |
669 | break; | |
b4a75708 | 670 | |
c570be0d MJ |
671 | case LTTNG_KERNEL_ABI_KPROBE: |
672 | lttng_fallthrough; | |
606828e4 | 673 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 674 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 675 | break; |
b4a75708 | 676 | |
606828e4 | 677 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 678 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 679 | break; |
b4a75708 | 680 | |
c570be0d MJ |
681 | case LTTNG_KERNEL_ABI_FUNCTION: |
682 | lttng_fallthrough; | |
683 | case LTTNG_KERNEL_ABI_NOOP: | |
684 | lttng_fallthrough; | |
a0493bef MD |
685 | default: |
686 | WARN_ON_ONCE(1); | |
687 | ret = -EINVAL; | |
688 | } | |
3c997079 MD |
689 | end: |
690 | mutex_unlock(&sessions_mutex); | |
691 | return ret; | |
e64957da MD |
692 | } |
693 | ||
9d993668 | 694 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
695 | { |
696 | int ret = 0; | |
697 | ||
698 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
699 | switch (event->type) { |
700 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
701 | { | |
702 | struct lttng_kernel_event_recorder *event_recorder = | |
703 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
704 | ||
ac847066 | 705 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
706 | ret = -EPERM; |
707 | goto end; | |
708 | } | |
b01155ba | 709 | break; |
9d993668 MD |
710 | } |
711 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
712 | switch (event->priv->instrumentation) { | |
713 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
714 | ret = -EINVAL; | |
715 | goto end; | |
716 | default: | |
717 | break; | |
718 | } | |
2b16f0c9 | 719 | break; |
dffef45d | 720 | default: |
9d993668 | 721 | break; |
dffef45d | 722 | } |
dffef45d | 723 | |
a67ba386 | 724 | if (!event->enabled) { |
dffef45d FD |
725 | ret = -EEXIST; |
726 | goto end; | |
727 | } | |
a67ba386 | 728 | switch (event->priv->instrumentation) { |
c570be0d MJ |
729 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
730 | lttng_fallthrough; | |
606828e4 | 731 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
732 | ret = -EINVAL; |
733 | break; | |
b4a75708 | 734 | |
c570be0d MJ |
735 | case LTTNG_KERNEL_ABI_KPROBE: |
736 | lttng_fallthrough; | |
606828e4 | 737 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 738 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 739 | break; |
b4a75708 | 740 | |
9d993668 MD |
741 | case LTTNG_KERNEL_ABI_KRETPROBE: |
742 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
743 | break; | |
744 | ||
c570be0d MJ |
745 | case LTTNG_KERNEL_ABI_FUNCTION: |
746 | lttng_fallthrough; | |
747 | case LTTNG_KERNEL_ABI_NOOP: | |
748 | lttng_fallthrough; | |
dffef45d FD |
749 | default: |
750 | WARN_ON_ONCE(1); | |
751 | ret = -EINVAL; | |
752 | } | |
753 | end: | |
754 | mutex_unlock(&sessions_mutex); | |
755 | return ret; | |
756 | } | |
757 | ||
ac847066 | 758 | struct lttng_kernel_channel_buffer *lttng_channel_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
759 | const char *transport_name, |
760 | void *buf_addr, | |
4e3c1b9b MD |
761 | size_t subbuf_size, size_t num_subbuf, |
762 | unsigned int switch_timer_interval, | |
d83004aa JD |
763 | unsigned int read_timer_interval, |
764 | enum channel_type channel_type) | |
4e3c1b9b | 765 | { |
ac847066 MD |
766 | struct lttng_kernel_channel_buffer *chan; |
767 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 768 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
769 | |
770 | mutex_lock(&sessions_mutex); | |
a40e3229 | 771 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 772 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 773 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 774 | if (!transport) { |
5a15f70c | 775 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 776 | transport_name); |
c0e31d2e | 777 | goto notransport; |
f3d01b96 | 778 | } |
a33c9927 | 779 | if (!try_module_get(transport->owner)) { |
5a15f70c | 780 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
781 | goto notransport; |
782 | } | |
ac847066 | 783 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 784 | if (!chan) |
c0e31d2e | 785 | goto nomem; |
ac847066 MD |
786 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
787 | if (!chan_priv) | |
788 | goto nomem_priv; | |
789 | chan->priv = chan_priv; | |
790 | chan_priv->pub = chan; | |
791 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
792 | chan->parent.session = session; | |
793 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 794 | chan->ops = &transport->ops; |
125b4df4 MD |
795 | /* |
796 | * Note: the channel creation op already writes into the packet | |
797 | * headers. Therefore the "chan" information used as input | |
798 | * should be already accessible. | |
799 | */ | |
ac847066 | 800 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
801 | chan, buf_addr, subbuf_size, num_subbuf, |
802 | switch_timer_interval, read_timer_interval); | |
ac847066 | 803 | if (!chan->priv->rb_chan) |
f3d01b96 | 804 | goto create_error; |
ac847066 MD |
805 | chan->priv->parent.tstate = 1; |
806 | chan->parent.enabled = 1; | |
807 | chan->priv->transport = transport; | |
808 | chan->priv->channel_type = channel_type; | |
809 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
810 | mutex_unlock(&sessions_mutex); |
811 | return chan; | |
812 | ||
f3d01b96 | 813 | create_error: |
ac847066 MD |
814 | kfree(chan_priv); |
815 | nomem_priv: | |
f3d01b96 | 816 | kfree(chan); |
c0e31d2e | 817 | nomem: |
a33c9927 MD |
818 | if (transport) |
819 | module_put(transport->owner); | |
c0e31d2e | 820 | notransport: |
e5382b6d | 821 | active: |
4e3c1b9b MD |
822 | mutex_unlock(&sessions_mutex); |
823 | return NULL; | |
824 | } | |
825 | ||
826 | /* | |
d83004aa JD |
827 | * Only used internally at session destruction for per-cpu channels, and |
828 | * when metadata channel is released. | |
829 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 830 | */ |
aa7c23a9 | 831 | static |
ac847066 | 832 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 833 | { |
ac847066 MD |
834 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
835 | module_put(chan->priv->transport->owner); | |
836 | list_del(&chan->priv->node); | |
837 | lttng_kernel_destroy_context(chan->priv->ctx); | |
838 | kfree(chan->priv); | |
4e3c1b9b MD |
839 | kfree(chan); |
840 | } | |
841 | ||
ac847066 | 842 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 843 | { |
ac847066 | 844 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
845 | |
846 | /* Protect the metadata cache with the sessions_mutex. */ | |
847 | mutex_lock(&sessions_mutex); | |
848 | _lttng_channel_destroy(chan); | |
849 | mutex_unlock(&sessions_mutex); | |
850 | } | |
851 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
852 | ||
853 | static | |
854 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
855 | { | |
856 | stream->finalized = 1; | |
857 | wake_up_interruptible(&stream->read_wait); | |
858 | } | |
859 | ||
a101fa10 | 860 | |
e5382b6d MD |
861 | /* |
862 | * Supports event creation while tracing session is active. | |
3c997079 | 863 | * Needs to be called with sessions mutex held. |
e5382b6d | 864 | */ |
ac847066 | 865 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan, |
606828e4 | 866 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 867 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 868 | enum lttng_kernel_abi_instrumentation itype) |
4e3c1b9b | 869 | { |
ac847066 | 870 | struct lttng_kernel_session *session = chan->parent.session; |
a67ba386 MD |
871 | struct lttng_kernel_event_recorder *event_recorder; |
872 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
873 | const char *event_name; |
874 | struct hlist_head *head; | |
3d084699 | 875 | int ret; |
4e3c1b9b | 876 | |
ac847066 | 877 | if (chan->priv->free_event_id == -1U) { |
4cf0bf51 | 878 | ret = -EMFILE; |
e5382b6d | 879 | goto full; |
abc0446a | 880 | } |
3c997079 MD |
881 | |
882 | switch (itype) { | |
606828e4 | 883 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 884 | event_name = event_desc->event_name; |
3c997079 | 885 | break; |
b4a75708 | 886 | |
c570be0d MJ |
887 | case LTTNG_KERNEL_ABI_KPROBE: |
888 | lttng_fallthrough; | |
889 | case LTTNG_KERNEL_ABI_UPROBE: | |
890 | lttng_fallthrough; | |
891 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
892 | lttng_fallthrough; | |
606828e4 | 893 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
894 | event_name = event_param->name; |
895 | break; | |
b4a75708 | 896 | |
c570be0d MJ |
897 | case LTTNG_KERNEL_ABI_FUNCTION: |
898 | lttng_fallthrough; | |
899 | case LTTNG_KERNEL_ABI_NOOP: | |
900 | lttng_fallthrough; | |
3c997079 MD |
901 | default: |
902 | WARN_ON_ONCE(1); | |
903 | ret = -EINVAL; | |
904 | goto type_error; | |
905 | } | |
4a11ef1c | 906 | |
a40e3229 | 907 | head = utils_borrow_hash_table_bucket(session->priv->events_ht.table, |
4a11ef1c | 908 | LTTNG_EVENT_HT_SIZE, event_name); |
a67ba386 MD |
909 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
910 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
911 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 912 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 913 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
914 | ret = -EEXIST; |
915 | goto exist; | |
abc0446a MD |
916 | } |
917 | } | |
3c997079 | 918 | |
a67ba386 MD |
919 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
920 | if (!event_recorder) { | |
4cf0bf51 | 921 | ret = -ENOMEM; |
4e3c1b9b | 922 | goto cache_error; |
abc0446a | 923 | } |
a67ba386 MD |
924 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
925 | if (!event_recorder_priv) { | |
926 | ret = -ENOMEM; | |
927 | goto cache_private_error; | |
928 | } | |
929 | event_recorder_priv->pub = event_recorder; | |
930 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
931 | event_recorder->priv = event_recorder_priv; | |
932 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
933 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
934 | ||
8a445457 | 935 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 936 | event_recorder->chan = chan; |
ac847066 | 937 | event_recorder->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
938 | event_recorder->priv->parent.instrumentation = itype; |
939 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
940 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
941 | |
942 | switch (itype) { | |
606828e4 | 943 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 944 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
945 | event_recorder->parent.enabled = 0; |
946 | event_recorder->priv->parent.registered = 0; | |
947 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
948 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 949 | ret = -ENOENT; |
d3dbe23c | 950 | goto register_error; |
abc0446a | 951 | } |
3c997079 MD |
952 | /* Populate lttng_event structure before event registration. */ |
953 | smp_wmb(); | |
baf20995 | 954 | break; |
b4a75708 | 955 | |
606828e4 | 956 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
957 | /* |
958 | * Needs to be explicitly enabled after creation, since | |
959 | * we may want to apply filters. | |
960 | */ | |
a67ba386 MD |
961 | event_recorder->parent.enabled = 0; |
962 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
963 | /* |
964 | * Populate lttng_event structure before event | |
965 | * registration. | |
966 | */ | |
967 | smp_wmb(); | |
8bf17deb | 968 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
969 | event_param->u.kprobe.symbol_name, |
970 | event_param->u.kprobe.offset, | |
971 | event_param->u.kprobe.addr, | |
a67ba386 | 972 | event_recorder); |
abc0446a | 973 | if (ret) { |
4cf0bf51 | 974 | ret = -EINVAL; |
d6d808f3 | 975 | goto register_error; |
abc0446a | 976 | } |
a67ba386 | 977 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 978 | WARN_ON_ONCE(!ret); |
d6d808f3 | 979 | break; |
b4a75708 | 980 | |
606828e4 | 981 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 982 | { |
a67ba386 MD |
983 | struct lttng_kernel_event_recorder *event_recorder_return; |
984 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
985 | |
986 | /* kretprobe defines 2 events */ | |
a0493bef MD |
987 | /* |
988 | * Needs to be explicitly enabled after creation, since | |
989 | * we may want to apply filters. | |
990 | */ | |
a67ba386 MD |
991 | event_recorder->parent.enabled = 0; |
992 | event_recorder->priv->parent.registered = 1; | |
993 | ||
994 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
995 | if (!event_recorder_return) { | |
996 | ret = -ENOMEM; | |
997 | goto register_error; | |
998 | } | |
999 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
1000 | if (!event_recorder_return_priv) { | |
1001 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1002 | ret = -ENOMEM; |
7371f44c | 1003 | goto register_error; |
abc0446a | 1004 | } |
a67ba386 MD |
1005 | event_recorder_return_priv->pub = event_recorder_return; |
1006 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
1007 | event_recorder_return->priv = event_recorder_return_priv; | |
1008 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
1009 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
1010 | ||
8a445457 | 1011 | event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 1012 | event_recorder_return->chan = chan; |
ac847066 | 1013 | event_recorder_return->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
1014 | event_recorder_return->priv->parent.instrumentation = itype; |
1015 | event_recorder_return->parent.enabled = 0; | |
1016 | event_recorder_return->priv->parent.registered = 1; | |
1017 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
1018 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 1019 | /* |
a90917c3 | 1020 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1021 | */ |
1022 | smp_wmb(); | |
3c997079 | 1023 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1024 | event_param->u.kretprobe.symbol_name, |
1025 | event_param->u.kretprobe.offset, | |
1026 | event_param->u.kretprobe.addr, | |
a67ba386 | 1027 | event_recorder, event_recorder_return); |
7371f44c | 1028 | if (ret) { |
a67ba386 MD |
1029 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1030 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1031 | ret = -EINVAL; |
7371f44c MD |
1032 | goto register_error; |
1033 | } | |
1034 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1035 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1036 | WARN_ON_ONCE(!ret); |
a67ba386 | 1037 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1038 | WARN_ON_ONCE(!ret); |
ac847066 | 1039 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, |
a67ba386 | 1040 | event_recorder_return); |
abc0446a | 1041 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1042 | if (ret) { |
a67ba386 MD |
1043 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1044 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
1045 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1046 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1047 | goto statedump_error; |
1048 | } | |
ac847066 | 1049 | list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events); |
7371f44c MD |
1050 | break; |
1051 | } | |
b4a75708 | 1052 | |
606828e4 | 1053 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1054 | /* |
1055 | * Needs to be explicitly enabled after creation, since | |
1056 | * we may want to apply filters. | |
1057 | */ | |
a67ba386 MD |
1058 | event_recorder->parent.enabled = 0; |
1059 | event_recorder->priv->parent.registered = 0; | |
1060 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1061 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1062 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1063 | ret = -EINVAL; |
1064 | goto register_error; | |
606828e4 | 1065 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1066 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1067 | break; |
606828e4 | 1068 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1069 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1070 | break; |
1071 | } | |
1072 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1073 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1074 | ret = -EINVAL; |
1075 | goto register_error; | |
606828e4 | 1076 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1077 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1078 | break; |
606828e4 | 1079 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1080 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1081 | break; |
1082 | } | |
a67ba386 | 1083 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1084 | ret = -EINVAL; |
259b6cb3 | 1085 | goto register_error; |
abc0446a | 1086 | } |
1ec65de1 | 1087 | break; |
b4a75708 | 1088 | |
606828e4 | 1089 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1090 | /* |
1091 | * Needs to be explicitly enabled after creation, since | |
1092 | * we may want to apply filters. | |
1093 | */ | |
a67ba386 MD |
1094 | event_recorder->parent.enabled = 0; |
1095 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1096 | |
a344f64b FD |
1097 | /* |
1098 | * Populate lttng_event structure before event | |
1099 | * registration. | |
1100 | */ | |
1101 | smp_wmb(); | |
149b9a9d | 1102 | |
83b802dc | 1103 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1104 | event_param->u.uprobe.fd, |
a67ba386 | 1105 | event_recorder); |
149b9a9d YB |
1106 | if (ret) |
1107 | goto register_error; | |
a67ba386 | 1108 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1109 | WARN_ON_ONCE(!ret); |
1110 | break; | |
b4a75708 | 1111 | |
c570be0d MJ |
1112 | case LTTNG_KERNEL_ABI_FUNCTION: |
1113 | lttng_fallthrough; | |
1114 | case LTTNG_KERNEL_ABI_NOOP: | |
1115 | lttng_fallthrough; | |
baf20995 MD |
1116 | default: |
1117 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1118 | ret = -EINVAL; |
df07930b | 1119 | goto register_error; |
baf20995 | 1120 | } |
ac847066 | 1121 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder); |
abc0446a MD |
1122 | WARN_ON_ONCE(ret > 0); |
1123 | if (ret) { | |
c099397a | 1124 | goto statedump_error; |
abc0446a | 1125 | } |
a67ba386 | 1126 | hlist_add_head(&event_recorder->priv->hlist, head); |
ac847066 | 1127 | list_add(&event_recorder->priv->node, &chan->parent.session->priv->events); |
a67ba386 | 1128 | return event_recorder; |
4e3c1b9b | 1129 | |
c099397a | 1130 | statedump_error: |
259b6cb3 | 1131 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1132 | register_error: |
a67ba386 MD |
1133 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1134 | cache_private_error: | |
1135 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1136 | cache_error: |
1137 | exist: | |
3c997079 | 1138 | type_error: |
e5382b6d | 1139 | full: |
4cf0bf51 | 1140 | return ERR_PTR(ret); |
4e3c1b9b MD |
1141 | } |
1142 | ||
a67ba386 | 1143 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1144 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1145 | uint64_t token, uint64_t error_counter_index, |
1146 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1147 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1148 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1149 | { |
a67ba386 MD |
1150 | struct lttng_kernel_event_notifier *event_notifier; |
1151 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1152 | struct lttng_counter *error_counter; |
dffef45d FD |
1153 | const char *event_name; |
1154 | struct hlist_head *head; | |
1155 | int ret; | |
1156 | ||
1157 | switch (itype) { | |
606828e4 | 1158 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1159 | event_name = event_desc->event_name; |
b01155ba | 1160 | break; |
b4a75708 | 1161 | |
c570be0d MJ |
1162 | case LTTNG_KERNEL_ABI_KPROBE: |
1163 | lttng_fallthrough; | |
1164 | case LTTNG_KERNEL_ABI_UPROBE: | |
1165 | lttng_fallthrough; | |
606828e4 | 1166 | case LTTNG_KERNEL_ABI_SYSCALL: |
2b16f0c9 FD |
1167 | event_name = event_notifier_param->event.name; |
1168 | break; | |
b4a75708 | 1169 | |
c570be0d MJ |
1170 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1171 | lttng_fallthrough; | |
1172 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1173 | lttng_fallthrough; | |
1174 | case LTTNG_KERNEL_ABI_NOOP: | |
1175 | lttng_fallthrough; | |
dffef45d FD |
1176 | default: |
1177 | WARN_ON_ONCE(1); | |
1178 | ret = -EINVAL; | |
1179 | goto type_error; | |
1180 | } | |
1181 | ||
1182 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1183 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
a67ba386 MD |
1184 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1185 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1186 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1187 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1188 | && event_notifier_group == event_notifier_priv->group |
1189 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1190 | ret = -EEXIST; |
1191 | goto exist; | |
1192 | } | |
1193 | } | |
1194 | ||
1195 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1196 | if (!event_notifier) { | |
1197 | ret = -ENOMEM; | |
1198 | goto cache_error; | |
1199 | } | |
a67ba386 MD |
1200 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1201 | if (!event_notifier_priv) { | |
1202 | ret = -ENOMEM; | |
1203 | goto cache_private_error; | |
1204 | } | |
1205 | event_notifier_priv->pub = event_notifier; | |
1206 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1207 | event_notifier->priv = event_notifier_priv; | |
1208 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1209 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1210 | ||
1211 | event_notifier->priv->group = event_notifier_group; | |
1212 | event_notifier->priv->parent.user_token = token; | |
1213 | event_notifier->priv->error_counter_index = error_counter_index; | |
1214 | event_notifier->priv->num_captures = 0; | |
1215 | event_notifier->priv->parent.instrumentation = itype; | |
1216 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1217 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1218 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1219 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
8a445457 | 1220 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; |
dffef45d FD |
1221 | |
1222 | switch (itype) { | |
606828e4 | 1223 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1224 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1225 | event_notifier->parent.enabled = 0; |
1226 | event_notifier->priv->parent.registered = 0; | |
1227 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1228 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1229 | ret = -ENOENT; |
1230 | goto register_error; | |
1231 | } | |
1232 | /* Populate lttng_event_notifier structure before event registration. */ | |
1233 | smp_wmb(); | |
1234 | break; | |
b4a75708 | 1235 | |
606828e4 | 1236 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1237 | /* |
1238 | * Needs to be explicitly enabled after creation, since | |
1239 | * we may want to apply filters. | |
1240 | */ | |
a67ba386 MD |
1241 | event_notifier->parent.enabled = 0; |
1242 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1243 | /* |
1244 | * Populate lttng_event_notifier structure before event | |
1245 | * registration. | |
1246 | */ | |
1247 | smp_wmb(); | |
1248 | ret = lttng_kprobes_register_event_notifier( | |
1249 | event_notifier_param->event.u.kprobe.symbol_name, | |
1250 | event_notifier_param->event.u.kprobe.offset, | |
1251 | event_notifier_param->event.u.kprobe.addr, | |
1252 | event_notifier); | |
1253 | if (ret) { | |
1254 | ret = -EINVAL; | |
1255 | goto register_error; | |
1256 | } | |
a67ba386 | 1257 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1258 | WARN_ON_ONCE(!ret); |
1259 | break; | |
b4a75708 | 1260 | |
606828e4 | 1261 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1262 | /* |
1263 | * Needs to be explicitly enabled after creation, since | |
1264 | * we may want to apply filters. | |
1265 | */ | |
a67ba386 MD |
1266 | event_notifier->parent.enabled = 0; |
1267 | event_notifier->priv->parent.registered = 0; | |
1268 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1269 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1270 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1271 | ret = -EINVAL; |
1272 | goto register_error; | |
606828e4 | 1273 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1274 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1275 | break; |
606828e4 | 1276 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1277 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1278 | break; |
1279 | } | |
1280 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1281 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1282 | ret = -EINVAL; |
1283 | goto register_error; | |
606828e4 | 1284 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1285 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1286 | break; |
606828e4 | 1287 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1288 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1289 | break; |
1290 | } | |
1291 | ||
a67ba386 | 1292 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1293 | ret = -EINVAL; |
1294 | goto register_error; | |
1295 | } | |
1296 | break; | |
b4a75708 | 1297 | |
606828e4 | 1298 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1299 | /* |
1300 | * Needs to be explicitly enabled after creation, since | |
1301 | * we may want to apply filters. | |
1302 | */ | |
a67ba386 MD |
1303 | event_notifier->parent.enabled = 0; |
1304 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1305 | |
1306 | /* | |
1307 | * Populate lttng_event_notifier structure before | |
1308 | * event_notifier registration. | |
1309 | */ | |
1310 | smp_wmb(); | |
1311 | ||
1312 | ret = lttng_uprobes_register_event_notifier( | |
1313 | event_notifier_param->event.name, | |
1314 | event_notifier_param->event.u.uprobe.fd, | |
1315 | event_notifier); | |
1316 | if (ret) | |
1317 | goto register_error; | |
a67ba386 | 1318 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1319 | WARN_ON_ONCE(!ret); |
1320 | break; | |
b4a75708 | 1321 | |
c570be0d MJ |
1322 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1323 | lttng_fallthrough; | |
1324 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1325 | lttng_fallthrough; | |
1326 | case LTTNG_KERNEL_ABI_NOOP: | |
1327 | lttng_fallthrough; | |
dffef45d FD |
1328 | default: |
1329 | WARN_ON_ONCE(1); | |
1330 | ret = -EINVAL; | |
1331 | goto register_error; | |
1332 | } | |
1333 | ||
a67ba386 MD |
1334 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1335 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1336 | |
1337 | /* | |
1338 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1339 | * bucket is currently in use. We trust it. The session lock |
1340 | * synchronizes against concurrent creation of the error | |
1341 | * counter. | |
99f52fcc | 1342 | */ |
ab04d7b1 MD |
1343 | error_counter = event_notifier_group->error_counter; |
1344 | if (error_counter) { | |
99f52fcc FD |
1345 | size_t dimension_index[1]; |
1346 | ||
1347 | /* | |
1348 | * Check that the index is within the boundary of the counter. | |
1349 | */ | |
a67ba386 | 1350 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1351 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1352 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1353 | ret = -EINVAL; |
1354 | goto register_error; | |
1355 | } | |
1356 | ||
a67ba386 | 1357 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1358 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1359 | if (ret) { |
1360 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1361 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1362 | goto register_error; |
1363 | } | |
1364 | } | |
1365 | ||
dffef45d FD |
1366 | return event_notifier; |
1367 | ||
1368 | register_error: | |
a67ba386 MD |
1369 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1370 | cache_private_error: | |
dffef45d FD |
1371 | kmem_cache_free(event_notifier_cache, event_notifier); |
1372 | cache_error: | |
1373 | exist: | |
1374 | type_error: | |
1375 | return ERR_PTR(ret); | |
1376 | } | |
1377 | ||
99f52fcc FD |
1378 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1379 | const size_t *dim_indexes, int32_t cpu, | |
1380 | int64_t *val, bool *overflow, bool *underflow) | |
1381 | { | |
1382 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1383 | cpu, val, overflow, underflow); | |
1384 | } | |
1385 | ||
1386 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1387 | const size_t *dim_indexes, int64_t *val, | |
1388 | bool *overflow, bool *underflow) | |
1389 | { | |
1390 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1391 | val, overflow, underflow); | |
1392 | } | |
1393 | ||
1394 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1395 | const size_t *dim_indexes) | |
1396 | { | |
1397 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1398 | } | |
1399 | ||
ac847066 | 1400 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan, |
606828e4 | 1401 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 1402 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 1403 | enum lttng_kernel_abi_instrumentation itype) |
3c997079 | 1404 | { |
a67ba386 | 1405 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1406 | |
1407 | mutex_lock(&sessions_mutex); | |
a67ba386 | 1408 | event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype); |
3c997079 MD |
1409 | mutex_unlock(&sessions_mutex); |
1410 | return event; | |
1411 | } | |
1412 | ||
a67ba386 | 1413 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1414 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1415 | uint64_t id, uint64_t error_counter_index, |
1416 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1417 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1418 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1419 | { |
a67ba386 | 1420 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1421 | |
1422 | mutex_lock(&sessions_mutex); | |
1423 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1424 | error_counter_index, event_notifier_group, |
a67ba386 | 1425 | event_notifier_param, itype); |
dffef45d FD |
1426 | mutex_unlock(&sessions_mutex); |
1427 | return event_notifier; | |
1428 | } | |
1429 | ||
3c997079 MD |
1430 | /* Only used for tracepoints for now. */ |
1431 | static | |
a67ba386 | 1432 | void register_event(struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 1433 | { |
437d5aa5 | 1434 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1435 | int ret = -EINVAL; |
3c997079 | 1436 | |
38b35aff | 1437 | WARN_ON_ONCE(event_recorder->priv->parent.registered); |
4ecb5ad5 | 1438 | |
a67ba386 MD |
1439 | desc = event_recorder->priv->parent.desc; |
1440 | switch (event_recorder->priv->parent.instrumentation) { | |
606828e4 | 1441 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1442 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
e69abdfd | 1443 | desc->tp_class->probe_callback, |
a67ba386 | 1444 | event_recorder); |
4ecb5ad5 | 1445 | break; |
b4a75708 | 1446 | |
606828e4 | 1447 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1448 | ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1449 | break; |
b4a75708 | 1450 | |
c570be0d MJ |
1451 | case LTTNG_KERNEL_ABI_KPROBE: |
1452 | lttng_fallthrough; | |
1453 | case LTTNG_KERNEL_ABI_UPROBE: | |
1454 | lttng_fallthrough; | |
606828e4 | 1455 | case LTTNG_KERNEL_ABI_KRETPROBE: |
4ecb5ad5 MD |
1456 | ret = 0; |
1457 | break; | |
b4a75708 | 1458 | |
c570be0d MJ |
1459 | case LTTNG_KERNEL_ABI_FUNCTION: |
1460 | lttng_fallthrough; | |
1461 | case LTTNG_KERNEL_ABI_NOOP: | |
1462 | lttng_fallthrough; | |
4ecb5ad5 MD |
1463 | default: |
1464 | WARN_ON_ONCE(1); | |
1465 | } | |
3c997079 | 1466 | if (!ret) |
a67ba386 | 1467 | event_recorder->priv->parent.registered = 1; |
3c997079 MD |
1468 | } |
1469 | ||
4e3c1b9b MD |
1470 | /* |
1471 | * Only used internally at session destruction. | |
1472 | */ | |
38b35aff MD |
1473 | static |
1474 | void unregister_event(struct lttng_kernel_event_recorder *event_recorder) | |
4e3c1b9b | 1475 | { |
a67ba386 | 1476 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
437d5aa5 | 1477 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1478 | int ret = -EINVAL; |
1479 | ||
38b35aff | 1480 | WARN_ON_ONCE(!event_priv->registered); |
3c997079 | 1481 | |
a67ba386 MD |
1482 | desc = event_priv->desc; |
1483 | switch (event_priv->instrumentation) { | |
606828e4 | 1484 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1485 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
e69abdfd | 1486 | event_priv->desc->tp_class->probe_callback, |
a67ba386 | 1487 | event_recorder); |
baf20995 | 1488 | break; |
b4a75708 | 1489 | |
606828e4 | 1490 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 | 1491 | lttng_kprobes_unregister_event(event_recorder); |
d6d808f3 MD |
1492 | ret = 0; |
1493 | break; | |
b4a75708 | 1494 | |
606828e4 | 1495 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 1496 | lttng_kretprobes_unregister(event_recorder); |
7371f44c MD |
1497 | ret = 0; |
1498 | break; | |
b4a75708 | 1499 | |
606828e4 | 1500 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1501 | ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1502 | break; |
b4a75708 | 1503 | |
606828e4 | 1504 | case LTTNG_KERNEL_ABI_NOOP: |
259b6cb3 MD |
1505 | ret = 0; |
1506 | break; | |
b4a75708 | 1507 | |
606828e4 | 1508 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 1509 | lttng_uprobes_unregister_event(event_recorder); |
149b9a9d YB |
1510 | ret = 0; |
1511 | break; | |
b4a75708 | 1512 | |
c570be0d MJ |
1513 | case LTTNG_KERNEL_ABI_FUNCTION: |
1514 | lttng_fallthrough; | |
baf20995 MD |
1515 | default: |
1516 | WARN_ON_ONCE(1); | |
1517 | } | |
38b35aff | 1518 | WARN_ON_ONCE(ret); |
3c997079 | 1519 | if (!ret) |
a67ba386 | 1520 | event_priv->registered = 0; |
38b35aff MD |
1521 | } |
1522 | ||
1523 | static | |
1524 | void _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder) | |
1525 | { | |
1526 | if (event_recorder->priv->parent.registered) | |
1527 | unregister_event(event_recorder); | |
dda6a249 MD |
1528 | } |
1529 | ||
dffef45d FD |
1530 | /* Only used for tracepoints for now. */ |
1531 | static | |
a67ba386 | 1532 | void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1533 | { |
437d5aa5 | 1534 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1535 | int ret = -EINVAL; |
1536 | ||
38b35aff | 1537 | WARN_ON_ONCE(event_notifier->priv->parent.registered); |
dffef45d | 1538 | |
a67ba386 MD |
1539 | desc = event_notifier->priv->parent.desc; |
1540 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1541 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1542 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
e69abdfd | 1543 | desc->tp_class->probe_callback, |
b01155ba FD |
1544 | event_notifier); |
1545 | break; | |
b4a75708 | 1546 | |
606828e4 | 1547 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1548 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); |
1549 | break; | |
b4a75708 | 1550 | |
c570be0d MJ |
1551 | case LTTNG_KERNEL_ABI_KPROBE: |
1552 | lttng_fallthrough; | |
606828e4 | 1553 | case LTTNG_KERNEL_ABI_UPROBE: |
2b16f0c9 FD |
1554 | ret = 0; |
1555 | break; | |
b4a75708 | 1556 | |
c570be0d MJ |
1557 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1558 | lttng_fallthrough; | |
1559 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1560 | lttng_fallthrough; | |
1561 | case LTTNG_KERNEL_ABI_NOOP: | |
1562 | lttng_fallthrough; | |
dffef45d FD |
1563 | default: |
1564 | WARN_ON_ONCE(1); | |
1565 | } | |
1566 | if (!ret) | |
a67ba386 | 1567 | event_notifier->priv->parent.registered = 1; |
dffef45d FD |
1568 | } |
1569 | ||
1570 | static | |
38b35aff | 1571 | int unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1572 | { |
437d5aa5 | 1573 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1574 | int ret = -EINVAL; |
1575 | ||
38b35aff | 1576 | WARN_ON_ONCE(!event_notifier->priv->parent.registered); |
dffef45d | 1577 | |
a67ba386 MD |
1578 | desc = event_notifier->priv->parent.desc; |
1579 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1580 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1581 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname, |
e69abdfd | 1582 | event_notifier->priv->parent.desc->tp_class->probe_callback, |
b01155ba FD |
1583 | event_notifier); |
1584 | break; | |
b4a75708 | 1585 | |
606828e4 | 1586 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1587 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1588 | ret = 0; | |
1589 | break; | |
b4a75708 | 1590 | |
606828e4 | 1591 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1592 | lttng_uprobes_unregister_event_notifier(event_notifier); |
1593 | ret = 0; | |
1594 | break; | |
b4a75708 | 1595 | |
606828e4 | 1596 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1597 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); |
1598 | break; | |
b4a75708 | 1599 | |
c570be0d MJ |
1600 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1601 | lttng_fallthrough; | |
1602 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1603 | lttng_fallthrough; | |
1604 | case LTTNG_KERNEL_ABI_NOOP: | |
1605 | lttng_fallthrough; | |
dffef45d FD |
1606 | default: |
1607 | WARN_ON_ONCE(1); | |
1608 | } | |
1609 | if (!ret) | |
a67ba386 | 1610 | event_notifier->priv->parent.registered = 0; |
dffef45d FD |
1611 | return ret; |
1612 | } | |
1613 | ||
38b35aff MD |
1614 | static |
1615 | void _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier) | |
1616 | { | |
1617 | if (event_notifier->priv->parent.registered) | |
1618 | unregister_event_notifier(event_notifier); | |
1619 | } | |
1620 | ||
dda6a249 MD |
1621 | /* |
1622 | * Only used internally at session destruction. | |
1623 | */ | |
be066e6c | 1624 | static |
0648898e | 1625 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1626 | { |
0648898e | 1627 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1628 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1629 | ||
0648898e MD |
1630 | lttng_free_event_filter_runtime(event); |
1631 | /* Free event enabler refs */ | |
1632 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1633 | &event_priv->enablers_ref_head, node) | |
1634 | kfree(enabler_ref); | |
b4a75708 | 1635 | |
0648898e MD |
1636 | switch (event->type) { |
1637 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1638 | { | |
1639 | struct lttng_kernel_event_recorder *event_recorder = | |
1640 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1641 | |
0648898e MD |
1642 | switch (event_priv->instrumentation) { |
1643 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1644 | lttng_event_desc_put(event_priv->desc); | |
1645 | break; | |
b4a75708 | 1646 | |
0648898e MD |
1647 | case LTTNG_KERNEL_ABI_KPROBE: |
1648 | module_put(event_priv->desc->owner); | |
1649 | lttng_kprobes_destroy_event_private(event_recorder); | |
1650 | break; | |
b4a75708 | 1651 | |
0648898e MD |
1652 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1653 | module_put(event_priv->desc->owner); | |
1654 | lttng_kretprobes_destroy_private(event_recorder); | |
1655 | break; | |
b4a75708 | 1656 | |
0648898e MD |
1657 | case LTTNG_KERNEL_ABI_SYSCALL: |
1658 | break; | |
4e3c1b9b | 1659 | |
0648898e MD |
1660 | case LTTNG_KERNEL_ABI_UPROBE: |
1661 | module_put(event_priv->desc->owner); | |
1662 | lttng_uprobes_destroy_event_private(event_recorder); | |
1663 | break; | |
3ef5cc03 | 1664 | |
c570be0d MJ |
1665 | case LTTNG_KERNEL_ABI_FUNCTION: |
1666 | lttng_fallthrough; | |
1667 | case LTTNG_KERNEL_ABI_NOOP: | |
1668 | lttng_fallthrough; | |
0648898e MD |
1669 | default: |
1670 | WARN_ON_ONCE(1); | |
1671 | } | |
1672 | list_del(&event_recorder->priv->node); | |
1673 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1674 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1675 | break; |
0648898e MD |
1676 | } |
1677 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1678 | { | |
1679 | struct lttng_kernel_event_notifier *event_notifier = | |
1680 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1681 | |
0648898e MD |
1682 | switch (event_notifier->priv->parent.instrumentation) { |
1683 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1684 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1685 | break; | |
b4a75708 | 1686 | |
0648898e MD |
1687 | case LTTNG_KERNEL_ABI_KPROBE: |
1688 | module_put(event_notifier->priv->parent.desc->owner); | |
1689 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1690 | break; | |
b4a75708 | 1691 | |
0648898e MD |
1692 | case LTTNG_KERNEL_ABI_SYSCALL: |
1693 | break; | |
b4a75708 | 1694 | |
0648898e MD |
1695 | case LTTNG_KERNEL_ABI_UPROBE: |
1696 | module_put(event_notifier->priv->parent.desc->owner); | |
1697 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1698 | break; | |
1699 | ||
c570be0d MJ |
1700 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1701 | lttng_fallthrough; | |
1702 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1703 | lttng_fallthrough; | |
1704 | case LTTNG_KERNEL_ABI_NOOP: | |
1705 | lttng_fallthrough; | |
0648898e MD |
1706 | default: |
1707 | WARN_ON_ONCE(1); | |
1708 | } | |
1709 | list_del(&event_notifier->priv->node); | |
1710 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1711 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1712 | break; | |
1713 | } | |
dffef45d FD |
1714 | default: |
1715 | WARN_ON_ONCE(1); | |
1716 | } | |
dffef45d FD |
1717 | } |
1718 | ||
a2fa977a | 1719 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1720 | enum tracker_type tracker_type) |
e0130fab | 1721 | { |
d1f652f8 MD |
1722 | switch (tracker_type) { |
1723 | case TRACKER_PID: | |
1724 | return &session->pid_tracker; | |
1725 | case TRACKER_VPID: | |
1726 | return &session->vpid_tracker; | |
1727 | case TRACKER_UID: | |
1728 | return &session->uid_tracker; | |
1729 | case TRACKER_VUID: | |
1730 | return &session->vuid_tracker; | |
1731 | case TRACKER_GID: | |
1732 | return &session->gid_tracker; | |
1733 | case TRACKER_VGID: | |
1734 | return &session->vgid_tracker; | |
1735 | default: | |
1736 | WARN_ON_ONCE(1); | |
1737 | return NULL; | |
1738 | } | |
1739 | } | |
1740 | ||
a40e3229 | 1741 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1742 | enum tracker_type tracker_type, int id) |
1743 | { | |
a2fa977a | 1744 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1745 | int ret; |
1746 | ||
d1f652f8 MD |
1747 | tracker = get_tracker(session, tracker_type); |
1748 | if (!tracker) | |
1749 | return -EINVAL; | |
1750 | if (id < -1) | |
e0130fab MD |
1751 | return -EINVAL; |
1752 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1753 | if (id == -1) { |
1754 | /* track all ids: destroy tracker. */ | |
1755 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1756 | ret = 0; |
1757 | } else { | |
d1f652f8 | 1758 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1759 | } |
e0130fab MD |
1760 | mutex_unlock(&sessions_mutex); |
1761 | return ret; | |
1762 | } | |
1763 | ||
a40e3229 | 1764 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1765 | enum tracker_type tracker_type, int id) |
e0130fab | 1766 | { |
a2fa977a | 1767 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1768 | int ret; |
1769 | ||
d1f652f8 MD |
1770 | tracker = get_tracker(session, tracker_type); |
1771 | if (!tracker) | |
1772 | return -EINVAL; | |
1773 | if (id < -1) | |
e0130fab MD |
1774 | return -EINVAL; |
1775 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1776 | if (id == -1) { |
1777 | /* untrack all ids: replace by empty tracker. */ | |
1778 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1779 | } else { |
d1f652f8 | 1780 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1781 | } |
e0130fab MD |
1782 | mutex_unlock(&sessions_mutex); |
1783 | return ret; | |
1784 | } | |
1785 | ||
7e6f9ef6 | 1786 | static |
d1f652f8 | 1787 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1788 | { |
a2fa977a MD |
1789 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1790 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1791 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1792 | int iter = 0, i; |
1793 | ||
1794 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1795 | if (id_tracker_p) { |
1796 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1797 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1798 | |
f934e302 | 1799 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1800 | if (iter++ >= *pos) |
1801 | return e; | |
1802 | } | |
1803 | } | |
1804 | } else { | |
d1f652f8 | 1805 | /* ID tracker disabled. */ |
7e6f9ef6 | 1806 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1807 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1808 | } |
1809 | iter++; | |
1810 | } | |
1811 | /* End of list */ | |
1812 | return NULL; | |
1813 | } | |
1814 | ||
1815 | /* Called with sessions_mutex held. */ | |
1816 | static | |
d1f652f8 | 1817 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1818 | { |
a2fa977a MD |
1819 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1820 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1821 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1822 | int iter = 0, i; |
1823 | ||
1824 | (*ppos)++; | |
d1f652f8 MD |
1825 | if (id_tracker_p) { |
1826 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1827 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1828 | |
f934e302 | 1829 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1830 | if (iter++ >= *ppos) |
1831 | return e; | |
1832 | } | |
1833 | } | |
1834 | } else { | |
d1f652f8 | 1835 | /* ID tracker disabled. */ |
7e6f9ef6 | 1836 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1837 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1838 | iter++; |
1839 | } | |
1840 | ||
1841 | /* End of list */ | |
1842 | return NULL; | |
1843 | } | |
1844 | ||
1845 | static | |
d1f652f8 | 1846 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1847 | { |
1848 | mutex_unlock(&sessions_mutex); | |
1849 | } | |
1850 | ||
1851 | static | |
d1f652f8 | 1852 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1853 | { |
a2fa977a MD |
1854 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1855 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1856 | int id; |
7e6f9ef6 | 1857 | |
d1f652f8 | 1858 | if (p == id_tracker_p) { |
7e6f9ef6 | 1859 | /* Tracker disabled. */ |
d1f652f8 | 1860 | id = -1; |
7e6f9ef6 | 1861 | } else { |
d1f652f8 | 1862 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1863 | |
d1f652f8 MD |
1864 | id = lttng_id_tracker_get_node_id(e); |
1865 | } | |
a2fa977a | 1866 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1867 | case TRACKER_PID: |
1868 | seq_printf(m, "process { pid = %d; };\n", id); | |
1869 | break; | |
1870 | case TRACKER_VPID: | |
1871 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1872 | break; | |
1873 | case TRACKER_UID: | |
1874 | seq_printf(m, "user { uid = %d; };\n", id); | |
1875 | break; | |
1876 | case TRACKER_VUID: | |
1877 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1878 | break; | |
1879 | case TRACKER_GID: | |
1880 | seq_printf(m, "group { gid = %d; };\n", id); | |
1881 | break; | |
1882 | case TRACKER_VGID: | |
1883 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1884 | break; | |
1885 | default: | |
1886 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1887 | } |
7e6f9ef6 MD |
1888 | return 0; |
1889 | } | |
1890 | ||
1891 | static | |
d1f652f8 MD |
1892 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1893 | .start = id_list_start, | |
1894 | .next = id_list_next, | |
1895 | .stop = id_list_stop, | |
1896 | .show = id_list_show, | |
7e6f9ef6 MD |
1897 | }; |
1898 | ||
1899 | static | |
d1f652f8 | 1900 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1901 | { |
d1f652f8 | 1902 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1903 | } |
1904 | ||
1905 | static | |
d1f652f8 | 1906 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1907 | { |
1908 | struct seq_file *m = file->private_data; | |
a2fa977a | 1909 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1910 | int ret; |
1911 | ||
d1f652f8 | 1912 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1913 | ret = seq_release(inode, file); |
d1f652f8 | 1914 | if (!ret) |
a2fa977a | 1915 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1916 | return ret; |
1917 | } | |
1918 | ||
d1f652f8 | 1919 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1920 | .owner = THIS_MODULE, |
d1f652f8 | 1921 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1922 | .read = seq_read, |
1923 | .llseek = seq_lseek, | |
d1f652f8 | 1924 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1925 | }; |
1926 | ||
a40e3229 | 1927 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1928 | enum tracker_type tracker_type) |
7e6f9ef6 | 1929 | { |
d1f652f8 | 1930 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1931 | struct seq_file *m; |
1932 | int file_fd, ret; | |
1933 | ||
1934 | file_fd = lttng_get_unused_fd(); | |
1935 | if (file_fd < 0) { | |
1936 | ret = file_fd; | |
1937 | goto fd_error; | |
1938 | } | |
1939 | ||
d1f652f8 MD |
1940 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1941 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1942 | NULL, O_RDWR); |
d1f652f8 MD |
1943 | if (IS_ERR(tracker_ids_list_file)) { |
1944 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1945 | goto file_error; |
1946 | } | |
a40e3229 | 1947 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1948 | ret = -EOVERFLOW; |
9c1f4643 MD |
1949 | goto refcount_error; |
1950 | } | |
d1f652f8 | 1951 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1952 | if (ret < 0) |
1953 | goto open_error; | |
d1f652f8 MD |
1954 | m = tracker_ids_list_file->private_data; |
1955 | ||
1956 | m->private = get_tracker(session, tracker_type); | |
1957 | BUG_ON(!m->private); | |
1958 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1959 | |
1960 | return file_fd; | |
1961 | ||
1962 | open_error: | |
a40e3229 | 1963 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1964 | refcount_error: |
d1f652f8 | 1965 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1966 | file_error: |
1967 | put_unused_fd(file_fd); | |
1968 | fd_error: | |
1969 | return ret; | |
1970 | } | |
1971 | ||
3c997079 MD |
1972 | /* |
1973 | * Enabler management. | |
1974 | */ | |
1975 | static | |
4993071a PP |
1976 | int lttng_match_enabler_star_glob(const char *desc_name, |
1977 | const char *pattern) | |
3c997079 | 1978 | { |
cbc19040 MD |
1979 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1980 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1981 | return 0; |
1982 | return 1; | |
1983 | } | |
1984 | ||
1985 | static | |
4ecb5ad5 MD |
1986 | int lttng_match_enabler_name(const char *desc_name, |
1987 | const char *name) | |
3c997079 | 1988 | { |
4ecb5ad5 | 1989 | if (strcmp(desc_name, name)) |
3c997079 MD |
1990 | return 0; |
1991 | return 1; | |
1992 | } | |
1993 | ||
437d5aa5 | 1994 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
3c997079 MD |
1995 | struct lttng_enabler *enabler) |
1996 | { | |
4ecb5ad5 | 1997 | const char *desc_name, *enabler_name; |
badfe9f5 | 1998 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1999 | |
2000 | enabler_name = enabler->event_param.name; | |
2001 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 2002 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 2003 | desc_name = desc->event_name; |
3b861b22 FD |
2004 | switch (enabler->format_type) { |
2005 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2006 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2007 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2008 | return lttng_match_enabler_name(desc_name, enabler_name); |
2009 | default: | |
2010 | return -EINVAL; | |
2011 | } | |
4ecb5ad5 | 2012 | break; |
b4a75708 | 2013 | |
606828e4 | 2014 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 2015 | desc_name = desc->event_name; |
badfe9f5 | 2016 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 2017 | desc_name += strlen("compat_"); |
badfe9f5 MD |
2018 | compat = true; |
2019 | } | |
4ecb5ad5 MD |
2020 | if (!strncmp(desc_name, "syscall_exit_", |
2021 | strlen("syscall_exit_"))) { | |
2022 | desc_name += strlen("syscall_exit_"); | |
2023 | } else if (!strncmp(desc_name, "syscall_entry_", | |
2024 | strlen("syscall_entry_"))) { | |
2025 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 2026 | entry = true; |
4ecb5ad5 MD |
2027 | } else { |
2028 | WARN_ON_ONCE(1); | |
2029 | return -EINVAL; | |
2030 | } | |
badfe9f5 | 2031 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 2032 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 2033 | break; |
606828e4 | 2034 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
2035 | if (!entry) |
2036 | return 0; | |
2037 | break; | |
606828e4 | 2038 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
2039 | if (entry) |
2040 | return 0; | |
2041 | break; | |
2042 | default: | |
2043 | return -EINVAL; | |
2044 | } | |
2045 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 2046 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 2047 | break; |
606828e4 | 2048 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
2049 | if (compat) |
2050 | return 0; | |
2051 | break; | |
606828e4 | 2052 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
2053 | if (!compat) |
2054 | return 0; | |
2055 | break; | |
2056 | default: | |
2057 | return -EINVAL; | |
2058 | } | |
2059 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2060 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2061 | switch (enabler->format_type) { |
2062 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2063 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2064 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2065 | return lttng_match_enabler_name(desc_name, enabler_name); |
2066 | default: | |
2067 | return -EINVAL; | |
2068 | } | |
2069 | break; | |
606828e4 | 2070 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2071 | return -EINVAL; /* Not implemented. */ |
2072 | default: | |
2073 | return -EINVAL; | |
2074 | } | |
4ecb5ad5 | 2075 | break; |
b4a75708 | 2076 | |
4ecb5ad5 MD |
2077 | default: |
2078 | WARN_ON_ONCE(1); | |
2079 | return -EINVAL; | |
2080 | } | |
3c997079 MD |
2081 | } |
2082 | ||
2083 | static | |
b2bc0bc8 | 2084 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
a67ba386 | 2085 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2086 | { |
b2bc0bc8 FD |
2087 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
2088 | event_enabler); | |
2089 | ||
a67ba386 | 2090 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2091 | return 0; |
a67ba386 MD |
2092 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2093 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2094 | return 1; |
2095 | else | |
2096 | return 0; | |
2097 | } | |
2098 | ||
b01155ba FD |
2099 | static |
2100 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2101 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba FD |
2102 | { |
2103 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
2104 | event_notifier_enabler); | |
2105 | ||
a67ba386 | 2106 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2107 | return 0; |
a67ba386 MD |
2108 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2109 | && event_notifier->priv->group == event_notifier_enabler->group | |
2110 | && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2111 | return 1; |
2112 | else | |
2113 | return 0; | |
2114 | } | |
2115 | ||
3c997079 | 2116 | static |
b2bc0bc8 FD |
2117 | struct lttng_enabler_ref *lttng_enabler_ref( |
2118 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2119 | struct lttng_enabler *enabler) |
2120 | { | |
2121 | struct lttng_enabler_ref *enabler_ref; | |
2122 | ||
b2bc0bc8 | 2123 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2124 | if (enabler_ref->ref == enabler) |
2125 | return enabler_ref; | |
2126 | } | |
2127 | return NULL; | |
2128 | } | |
2129 | ||
3c997079 | 2130 | static |
1b917d6b | 2131 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2132 | { |
ac847066 | 2133 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; |
437d5aa5 MD |
2134 | struct lttng_kernel_probe_desc *probe_desc; |
2135 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2136 | int i; |
2137 | struct list_head *probe_list; | |
2138 | ||
2139 | probe_list = lttng_get_probe_list_head(); | |
2140 | /* | |
2141 | * For each probe event, if we find that a probe event matches | |
2142 | * our enabler, create an associated lttng_event if not | |
2143 | * already present. | |
2144 | */ | |
2145 | list_for_each_entry(probe_desc, probe_list, head) { | |
2146 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2147 | int found = 0; | |
2148 | struct hlist_head *head; | |
a67ba386 MD |
2149 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2150 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2151 | |
2152 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2153 | if (!lttng_desc_match_enabler(desc, |
2154 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2155 | continue; |
3c997079 MD |
2156 | |
2157 | /* | |
2158 | * Check if already created. | |
2159 | */ | |
4a11ef1c | 2160 | head = utils_borrow_hash_table_bucket( |
a40e3229 | 2161 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 2162 | desc->event_name); |
a67ba386 MD |
2163 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2164 | if (event_recorder_private->parent.desc == desc | |
2165 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2166 | found = 1; |
2167 | } | |
2168 | if (found) | |
2169 | continue; | |
2170 | ||
2171 | /* | |
2172 | * We need to create an event for this | |
2173 | * event probe. | |
2174 | */ | |
a67ba386 MD |
2175 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan, |
2176 | NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT); | |
2177 | if (!event_recorder) { | |
5a15f70c | 2178 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2179 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2180 | } |
2181 | } | |
2182 | } | |
2183 | } | |
2184 | ||
b01155ba FD |
2185 | static |
2186 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2187 | { | |
2188 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2189 | struct lttng_kernel_probe_desc *probe_desc; |
2190 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2191 | int i; |
2192 | struct list_head *probe_list; | |
2193 | ||
2194 | probe_list = lttng_get_probe_list_head(); | |
2195 | /* | |
2196 | * For each probe event, if we find that a probe event matches | |
2197 | * our enabler, create an associated lttng_event_notifier if not | |
2198 | * already present. | |
2199 | */ | |
2200 | list_for_each_entry(probe_desc, probe_list, head) { | |
2201 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2202 | int found = 0; | |
2203 | struct hlist_head *head; | |
a67ba386 MD |
2204 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2205 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2206 | |
2207 | desc = probe_desc->event_desc[i]; | |
2208 | if (!lttng_desc_match_enabler(desc, | |
2209 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2210 | continue; | |
2211 | ||
2212 | /* | |
2213 | * Check if already created. | |
2214 | */ | |
2215 | head = utils_borrow_hash_table_bucket( | |
2216 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2217 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2218 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2219 | if (event_notifier_priv->parent.desc == desc | |
2220 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2221 | found = 1; |
2222 | } | |
2223 | if (found) | |
2224 | continue; | |
2225 | ||
2226 | /* | |
2227 | * We need to create a event_notifier for this event probe. | |
2228 | */ | |
2229 | event_notifier = _lttng_event_notifier_create(desc, | |
2230 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2231 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2232 | event_notifier_group, NULL, |
606828e4 | 2233 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2234 | if (IS_ERR(event_notifier)) { |
2235 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2236 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2237 | } |
2238 | } | |
2239 | } | |
2240 | } | |
2241 | ||
33a39a3c | 2242 | static |
1b917d6b | 2243 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2244 | { |
2245 | int ret; | |
2246 | ||
a67ba386 | 2247 | ret = lttng_syscalls_register_event(event_enabler); |
33a39a3c MD |
2248 | WARN_ON_ONCE(ret); |
2249 | } | |
2250 | ||
8a8ac9a8 FD |
2251 | static |
2252 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2253 | { | |
2254 | int ret; | |
2255 | ||
a67ba386 | 2256 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler); |
8a8ac9a8 | 2257 | WARN_ON_ONCE(ret); |
a67ba386 | 2258 | ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler); |
8a8ac9a8 FD |
2259 | WARN_ON_ONCE(ret); |
2260 | } | |
2261 | ||
33a39a3c | 2262 | /* |
a67ba386 | 2263 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2264 | * tracepoint probes. |
2265 | * Should be called with sessions mutex held. | |
2266 | */ | |
2267 | static | |
b2bc0bc8 | 2268 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2269 | { |
b2bc0bc8 | 2270 | switch (event_enabler->base.event_param.instrumentation) { |
606828e4 | 2271 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2272 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2273 | break; |
b4a75708 | 2274 | |
606828e4 | 2275 | case LTTNG_KERNEL_ABI_SYSCALL: |
1b917d6b | 2276 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2277 | break; |
b4a75708 | 2278 | |
33a39a3c MD |
2279 | default: |
2280 | WARN_ON_ONCE(1); | |
2281 | break; | |
2282 | } | |
2283 | } | |
2284 | ||
3c997079 | 2285 | /* |
b2bc0bc8 | 2286 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2287 | * and add backward reference from the event to the enabler. |
2288 | * Should be called with sessions mutex held. | |
2289 | */ | |
2290 | static | |
b2bc0bc8 | 2291 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2292 | { |
ac847066 MD |
2293 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
2294 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; | |
b2bc0bc8 | 2295 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); |
a67ba386 | 2296 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2297 | |
606828e4 MD |
2298 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2299 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2300 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2301 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2302 | int enabled = base_enabler->enabled; |
606828e4 | 2303 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2304 | |
606828e4 | 2305 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
ac847066 | 2306 | WRITE_ONCE(chan->priv->parent.syscall_all_entry, enabled); |
3b82c4e1 | 2307 | |
606828e4 | 2308 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
ac847066 | 2309 | WRITE_ONCE(chan->priv->parent.syscall_all_exit, enabled); |
badfe9f5 MD |
2310 | } |
2311 | ||
3c997079 | 2312 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2313 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2314 | |
b2bc0bc8 | 2315 | /* For each event matching event_enabler in session event list. */ |
a40e3229 | 2316 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2317 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2318 | struct lttng_enabler_ref *enabler_ref; |
2319 | ||
a67ba386 | 2320 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2321 | continue; |
a67ba386 | 2322 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
b2bc0bc8 | 2323 | lttng_event_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2324 | if (!enabler_ref) { |
2325 | /* | |
2326 | * If no backward ref, create it. | |
b2bc0bc8 | 2327 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2328 | */ |
2329 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2330 | if (!enabler_ref) | |
2331 | return -ENOMEM; | |
b2bc0bc8 | 2332 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 | 2333 | list_add(&enabler_ref->node, |
a67ba386 | 2334 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2335 | } |
2336 | ||
f127e61e MD |
2337 | /* |
2338 | * Link filter bytecodes if not linked yet. | |
2339 | */ | |
a67ba386 | 2340 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2341 | lttng_static_ctx, |
a67ba386 | 2342 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
60206944 | 2343 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2344 | } |
2345 | return 0; | |
2346 | } | |
2347 | ||
b01155ba | 2348 | /* |
a67ba386 | 2349 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2350 | * tracepoint probes. |
2351 | * Should be called with sessions mutex held. | |
2352 | */ | |
2353 | static | |
2354 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2355 | { | |
2356 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
606828e4 | 2357 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2358 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2359 | break; | |
b4a75708 | 2360 | |
606828e4 | 2361 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
2362 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); |
2363 | break; | |
b4a75708 | 2364 | |
b01155ba FD |
2365 | default: |
2366 | WARN_ON_ONCE(1); | |
2367 | break; | |
2368 | } | |
2369 | } | |
2370 | ||
2371 | /* | |
2372 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2373 | */ | |
2374 | static | |
8a8ac9a8 FD |
2375 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2376 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2377 | { |
2378 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2379 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2380 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2381 | |
606828e4 MD |
2382 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2383 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2384 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2385 | !strcmp(base_enabler->event_param.name, "*")) { |
2386 | ||
2387 | int enabled = base_enabler->enabled; | |
606828e4 | 2388 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2389 | |
606828e4 | 2390 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2391 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); |
2392 | ||
606828e4 | 2393 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2394 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); |
2395 | ||
2396 | } | |
2397 | ||
b01155ba FD |
2398 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2399 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2400 | ||
2401 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2402 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2403 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2404 | struct lttng_enabler_ref *enabler_ref; |
2405 | ||
2406 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2407 | continue; | |
2408 | ||
a67ba386 | 2409 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2410 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2411 | if (!enabler_ref) { | |
2412 | /* | |
2413 | * If no backward ref, create it. | |
2414 | * Add backward ref from event_notifier to enabler. | |
2415 | */ | |
2416 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2417 | if (!enabler_ref) | |
2418 | return -ENOMEM; | |
2419 | ||
2420 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2421 | event_notifier_enabler); | |
2422 | list_add(&enabler_ref->node, | |
a67ba386 | 2423 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2424 | } |
2425 | ||
2426 | /* | |
2427 | * Link filter bytecodes if not linked yet. | |
2428 | */ | |
a67ba386 MD |
2429 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2430 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2431 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2432 | |
2433 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2434 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2435 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2436 | &event_notifier_enabler->capture_bytecode_head); |
2437 | ||
a67ba386 | 2438 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2439 | } |
2440 | return 0; | |
2441 | } | |
2442 | ||
3c997079 MD |
2443 | /* |
2444 | * Called at module load: connect the probe on all enablers matching | |
2445 | * this event. | |
2446 | * Called with sessions lock held. | |
2447 | */ | |
2448 | int lttng_fix_pending_events(void) | |
2449 | { | |
a40e3229 | 2450 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2451 | |
a40e3229 MD |
2452 | list_for_each_entry(session_priv, &sessions, list) |
2453 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2454 | return 0; |
2455 | } | |
2456 | ||
b01155ba FD |
2457 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2458 | struct lttng_event_notifier_group *event_notifier_group) | |
2459 | { | |
2460 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2461 | ||
2462 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2463 | node) { | |
2464 | if (event_notifier_enabler->base.enabled) | |
2465 | return true; | |
2466 | } | |
2467 | return false; | |
2468 | } | |
2469 | ||
2470 | bool lttng_event_notifier_active(void) | |
2471 | { | |
2472 | struct lttng_event_notifier_group *event_notifier_group; | |
2473 | ||
2474 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2475 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2476 | return true; | |
2477 | } | |
2478 | return false; | |
2479 | } | |
2480 | ||
2481 | int lttng_fix_pending_event_notifiers(void) | |
2482 | { | |
2483 | struct lttng_event_notifier_group *event_notifier_group; | |
2484 | ||
2485 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2486 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2487 | return 0; | |
2488 | } | |
2489 | ||
b2bc0bc8 FD |
2490 | struct lttng_event_enabler *lttng_event_enabler_create( |
2491 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2492 | struct lttng_kernel_abi_event *event_param, |
ac847066 | 2493 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2494 | { |
b2bc0bc8 | 2495 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2496 | |
b2bc0bc8 FD |
2497 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2498 | if (!event_enabler) | |
3c997079 | 2499 | return NULL; |
b2bc0bc8 FD |
2500 | event_enabler->base.format_type = format_type; |
2501 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2502 | memcpy(&event_enabler->base.event_param, event_param, | |
2503 | sizeof(event_enabler->base.event_param)); | |
2504 | event_enabler->chan = chan; | |
3c997079 | 2505 | /* ctx left NULL */ |
b2bc0bc8 | 2506 | event_enabler->base.enabled = 0; |
3c997079 | 2507 | mutex_lock(&sessions_mutex); |
ac847066 MD |
2508 | list_add(&event_enabler->node, &event_enabler->chan->parent.session->priv->enablers_head); |
2509 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); | |
3c997079 | 2510 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2511 | return event_enabler; |
3c997079 MD |
2512 | } |
2513 | ||
b2bc0bc8 | 2514 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2515 | { |
2516 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2517 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
ac847066 | 2518 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2519 | mutex_unlock(&sessions_mutex); |
2520 | return 0; | |
2521 | } | |
2522 | ||
b2bc0bc8 | 2523 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2524 | { |
2525 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2526 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
ac847066 | 2527 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2528 | mutex_unlock(&sessions_mutex); |
2529 | return 0; | |
2530 | } | |
2531 | ||
b2bc0bc8 | 2532 | static |
183e8b3a | 2533 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
606828e4 | 2534 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2535 | { |
9906b046 | 2536 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2537 | uint32_t bytecode_len; |
2538 | int ret; | |
2539 | ||
2540 | ret = get_user(bytecode_len, &bytecode->len); | |
2541 | if (ret) | |
2542 | return ret; | |
52cfcdf3 | 2543 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2544 | GFP_KERNEL); |
2545 | if (!bytecode_node) | |
2546 | return -ENOMEM; | |
2547 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2548 | sizeof(*bytecode) + bytecode_len); | |
2549 | if (ret) | |
2550 | goto error_free; | |
b2bc0bc8 | 2551 | |
8a445457 | 2552 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2553 | bytecode_node->enabler = enabler; |
2554 | /* Enforce length based on allocated size */ | |
2555 | bytecode_node->bc.len = bytecode_len; | |
2556 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2557 | |
07dfc1d0 MD |
2558 | return 0; |
2559 | ||
2560 | error_free: | |
52cfcdf3 | 2561 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2562 | return ret; |
2563 | } | |
2564 | ||
183e8b3a | 2565 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
606828e4 | 2566 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2567 | { |
2568 | int ret; | |
183e8b3a | 2569 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2570 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2571 | if (ret) | |
2572 | goto error; | |
2573 | ||
ac847066 | 2574 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
b2bc0bc8 FD |
2575 | return 0; |
2576 | ||
2577 | error: | |
2578 | return ret; | |
2579 | } | |
2580 | ||
e2d5dbc7 | 2581 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2582 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2583 | { |
2584 | ||
e2d5dbc7 | 2585 | switch (event->priv->instrumentation) { |
606828e4 | 2586 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2587 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2588 | default: |
2589 | return -EINVAL; | |
2590 | } | |
2591 | } | |
2592 | ||
3c997079 MD |
2593 | static |
2594 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2595 | { | |
9906b046 | 2596 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2597 | |
2598 | /* Destroy filter bytecode */ | |
2599 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2600 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2601 | lttng_kvfree(filter_node); |
07dfc1d0 | 2602 | } |
b2bc0bc8 FD |
2603 | } |
2604 | ||
2605 | static | |
2606 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2607 | { | |
2608 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2609 | |
b2bc0bc8 FD |
2610 | list_del(&event_enabler->node); |
2611 | kfree(event_enabler); | |
3c997079 MD |
2612 | } |
2613 | ||
dffef45d FD |
2614 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2615 | struct lttng_event_notifier_group *event_notifier_group, | |
2616 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2617 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2618 | { |
2619 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2620 | ||
2621 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2622 | if (!event_notifier_enabler) | |
2623 | return NULL; | |
2624 | ||
2625 | event_notifier_enabler->base.format_type = format_type; | |
2626 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2627 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2628 | ||
99f52fcc | 2629 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2630 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2631 | |
8a8ac9a8 FD |
2632 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2633 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2634 | |
2635 | event_notifier_enabler->base.enabled = 0; | |
2636 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2637 | event_notifier_enabler->group = event_notifier_group; | |
2638 | ||
2639 | mutex_lock(&sessions_mutex); | |
2640 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2641 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2642 | |
2643 | mutex_unlock(&sessions_mutex); | |
2644 | ||
2645 | return event_notifier_enabler; | |
2646 | } | |
2647 | ||
2648 | int lttng_event_notifier_enabler_enable( | |
2649 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2650 | { | |
2651 | mutex_lock(&sessions_mutex); | |
2652 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2653 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2654 | mutex_unlock(&sessions_mutex); |
2655 | return 0; | |
2656 | } | |
2657 | ||
2658 | int lttng_event_notifier_enabler_disable( | |
2659 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2660 | { | |
2661 | mutex_lock(&sessions_mutex); | |
2662 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2663 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2664 | mutex_unlock(&sessions_mutex); |
2665 | return 0; | |
2666 | } | |
2667 | ||
183e8b3a | 2668 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d | 2669 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
606828e4 | 2670 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
dffef45d FD |
2671 | { |
2672 | int ret; | |
2673 | ||
183e8b3a | 2674 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2675 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2676 | bytecode); | |
2677 | if (ret) | |
2678 | goto error; | |
2679 | ||
b01155ba | 2680 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2681 | return 0; |
2682 | ||
2683 | error: | |
2684 | return ret; | |
2685 | } | |
2686 | ||
99d223ad FD |
2687 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2688 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2689 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2690 | { |
9906b046 | 2691 | struct lttng_kernel_bytecode_node *bytecode_node; |
99d223ad FD |
2692 | struct lttng_enabler *enabler = |
2693 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2694 | uint32_t bytecode_len; | |
2695 | int ret; | |
2696 | ||
2697 | ret = get_user(bytecode_len, &bytecode->len); | |
2698 | if (ret) | |
2699 | return ret; | |
2700 | ||
2701 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2702 | GFP_KERNEL); | |
2703 | if (!bytecode_node) | |
2704 | return -ENOMEM; | |
2705 | ||
2706 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2707 | sizeof(*bytecode) + bytecode_len); | |
2708 | if (ret) | |
2709 | goto error_free; | |
2710 | ||
8a445457 | 2711 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2712 | bytecode_node->enabler = enabler; |
2713 | ||
2714 | /* Enforce length based on allocated size */ | |
2715 | bytecode_node->bc.len = bytecode_len; | |
2716 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2717 | ||
2718 | event_notifier_enabler->num_captures++; | |
2719 | ||
2720 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2721 | goto end; | |
2722 | ||
2723 | error_free: | |
2724 | lttng_kvfree(bytecode_node); | |
2725 | end: | |
2726 | return ret; | |
2727 | } | |
2728 | ||
dffef45d FD |
2729 | static |
2730 | void lttng_event_notifier_enabler_destroy( | |
2731 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2732 | { | |
2733 | if (!event_notifier_enabler) { | |
2734 | return; | |
2735 | } | |
2736 | ||
2737 | list_del(&event_notifier_enabler->node); | |
2738 | ||
2739 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2740 | kfree(event_notifier_enabler); | |
2741 | } | |
2742 | ||
3c997079 | 2743 | /* |
b2bc0bc8 | 2744 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2745 | * session. |
2746 | * Should be called with sessions mutex held. | |
2747 | */ | |
2748 | static | |
a40e3229 | 2749 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2750 | { |
b2bc0bc8 | 2751 | struct lttng_event_enabler *event_enabler; |
a67ba386 | 2752 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2753 | |
a40e3229 | 2754 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2755 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2756 | /* |
2757 | * For each event, if at least one of its enablers is enabled, | |
2758 | * and its channel and session transient states are enabled, we | |
2759 | * enable the event, else we disable it. | |
2760 | */ | |
a40e3229 | 2761 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2762 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2763 | struct lttng_enabler_ref *enabler_ref; |
dc7350d6 | 2764 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2765 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2766 | int nr_filters = 0; | |
3c997079 | 2767 | |
a67ba386 | 2768 | switch (event_recorder_priv->parent.instrumentation) { |
c570be0d MJ |
2769 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2770 | lttng_fallthrough; | |
606828e4 | 2771 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
2772 | /* Enable events */ |
2773 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2774 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2775 | if (enabler_ref->ref->enabled) { |
2776 | enabled = 1; | |
2777 | break; | |
2778 | } | |
2779 | } | |
4ecb5ad5 | 2780 | break; |
b4a75708 | 2781 | |
4ecb5ad5 | 2782 | default: |
3c997079 MD |
2783 | /* Not handled with lazy sync. */ |
2784 | continue; | |
2785 | } | |
2786 | /* | |
2787 | * Enabled state is based on union of enablers, with | |
2788 | * intesection of session and channel transient enable | |
2789 | * states. | |
2790 | */ | |
ac847066 | 2791 | enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; |
3c997079 | 2792 | |
a67ba386 | 2793 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2794 | /* |
2795 | * Sync tracepoint registration with event enabled | |
2796 | * state. | |
2797 | */ | |
2798 | if (enabled) { | |
38b35aff MD |
2799 | if (!event_recorder_priv->parent.registered) |
2800 | register_event(event_recorder); | |
3c997079 | 2801 | } else { |
38b35aff MD |
2802 | if (event_recorder_priv->parent.registered) |
2803 | _lttng_event_unregister(event_recorder); | |
3c997079 | 2804 | } |
07dfc1d0 MD |
2805 | |
2806 | /* Check if has enablers without bytecode enabled */ | |
2807 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2808 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2809 | if (enabler_ref->ref->enabled |
2810 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2811 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2812 | break; |
2813 | } | |
2814 | } | |
a67ba386 | 2815 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2816 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2817 | |
2818 | /* Enable filters */ | |
2819 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2820 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2821 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2822 | nr_filters++; |
2823 | } | |
2824 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2825 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2826 | } |
2827 | } | |
2828 | ||
2829 | /* | |
2830 | * Apply enablers to session events, adding events to session if need | |
2831 | * be. It is required after each modification applied to an active | |
2832 | * session, and right before session "start". | |
2833 | * "lazy" sync means we only sync if required. | |
2834 | * Should be called with sessions mutex held. | |
2835 | */ | |
2836 | static | |
a40e3229 | 2837 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2838 | { |
2839 | /* We can skip if session is not active */ | |
2840 | if (!session->active) | |
2841 | return; | |
b2bc0bc8 | 2842 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2843 | } |
2844 | ||
b01155ba FD |
2845 | static |
2846 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2847 | { | |
2848 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2849 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2850 | |
2851 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2852 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2853 | ||
2854 | /* | |
2855 | * For each event_notifier, if at least one of its enablers is enabled, | |
2856 | * we enable the event_notifier, else we disable it. | |
2857 | */ | |
a67ba386 MD |
2858 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2859 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2860 | struct lttng_enabler_ref *enabler_ref; |
dc7350d6 | 2861 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2862 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2863 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2864 | |
a67ba386 | 2865 | switch (event_notifier_priv->parent.instrumentation) { |
c570be0d MJ |
2866 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2867 | lttng_fallthrough; | |
606828e4 | 2868 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
2869 | /* Enable event_notifiers */ |
2870 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2871 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2872 | if (enabler_ref->ref->enabled) { |
2873 | enabled = 1; | |
2874 | break; | |
2875 | } | |
2876 | } | |
2877 | break; | |
b4a75708 | 2878 | |
b01155ba FD |
2879 | default: |
2880 | /* Not handled with sync. */ | |
2881 | continue; | |
2882 | } | |
2883 | ||
a67ba386 | 2884 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2885 | /* |
2886 | * Sync tracepoint registration with event_notifier enabled | |
2887 | * state. | |
2888 | */ | |
2889 | if (enabled) { | |
a67ba386 | 2890 | if (!event_notifier_priv->parent.registered) |
b01155ba FD |
2891 | register_event_notifier(event_notifier); |
2892 | } else { | |
a67ba386 | 2893 | if (event_notifier_priv->parent.registered) |
38b35aff | 2894 | unregister_event_notifier(event_notifier); |
b01155ba FD |
2895 | } |
2896 | ||
2897 | /* Check if has enablers without bytecode enabled */ | |
2898 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2899 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2900 | if (enabler_ref->ref->enabled |
2901 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2902 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2903 | break; |
2904 | } | |
2905 | } | |
a67ba386 | 2906 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2907 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2908 | |
2909 | /* Enable filters */ | |
2910 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2911 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2912 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2913 | nr_filters++; |
2914 | } | |
2915 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2916 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2917 | |
2918 | /* Enable captures */ | |
2919 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2920 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2921 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2922 | nr_captures++; |
2923 | } | |
2924 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2925 | } |
2926 | } | |
2927 | ||
1ec3f75a | 2928 | /* |
d83004aa JD |
2929 | * Serialize at most one packet worth of metadata into a metadata |
2930 | * channel. | |
92d9f5e6 MD |
2931 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2932 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2933 | * allows us to do racy operations such as looking for remaining space left in | |
2934 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2935 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2936 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2937 | * Returns the number of bytes written in the channel, 0 if no data |
2938 | * was written and a negative value on error. | |
1ec3f75a | 2939 | */ |
b3b8072b | 2940 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
4071a628 | 2941 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2942 | { |
e27e4381 | 2943 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2944 | int ret = 0; |
2945 | size_t len, reserve_len; | |
2946 | ||
f613e3e6 | 2947 | /* |
92d9f5e6 MD |
2948 | * Ensure we support mutiple get_next / put sequences followed by |
2949 | * put_next. The metadata cache lock protects reading the metadata | |
2950 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2951 | * "flush" operations on the buffer invoked by different processes. | |
2952 | * Moreover, since the metadata cache memory can be reallocated, we | |
2953 | * need to have exclusive access against updates even though we only | |
2954 | * read it. | |
f613e3e6 | 2955 | */ |
92d9f5e6 | 2956 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2957 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2958 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2959 | goto end; |
f613e3e6 | 2960 | |
9616f0bf JD |
2961 | /* Metadata regenerated, change the version. */ |
2962 | if (stream->metadata_cache->version != stream->version) | |
2963 | stream->version = stream->metadata_cache->version; | |
2964 | ||
d83004aa | 2965 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2966 | stream->metadata_in; |
9de2c215 | 2967 | if (!len) |
de23d59d | 2968 | goto end; |
d83004aa | 2969 | reserve_len = min_t(size_t, |
da1fe18f | 2970 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2971 | len); |
a775608d | 2972 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
c7d9db61 | 2973 | sizeof(char), NULL); |
d83004aa JD |
2974 | /* |
2975 | * If reservation failed, return an error to the caller. | |
2976 | */ | |
cefd899f | 2977 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2978 | if (ret != 0) { |
2979 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2980 | stream->coherent = false; |
d83004aa JD |
2981 | goto end; |
2982 | } | |
b3b8072b | 2983 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2984 | stream->metadata_cache->data + stream->metadata_in, |
77fcffef | 2985 | reserve_len, 1); |
b3b8072b | 2986 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2987 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2988 | if (reserve_len < len) |
8b97fd42 MD |
2989 | stream->coherent = false; |
2990 | else | |
2991 | stream->coherent = true; | |
d83004aa JD |
2992 | ret = reserve_len; |
2993 | ||
2994 | end: | |
8b97fd42 MD |
2995 | if (coherent) |
2996 | *coherent = stream->coherent; | |
92d9f5e6 | 2997 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2998 | return ret; |
2999 | } | |
3000 | ||
8b97fd42 | 3001 | static |
a40e3229 | 3002 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 3003 | { |
a40e3229 MD |
3004 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
3005 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
3006 | } |
3007 | ||
3008 | static | |
a40e3229 | 3009 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 3010 | { |
a40e3229 MD |
3011 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3012 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
3013 | struct lttng_metadata_stream *stream; |
3014 | ||
a40e3229 | 3015 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 3016 | wake_up_interruptible(&stream->read_wait); |
a40e3229 | 3017 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 3018 | } |
8b97fd42 MD |
3019 | } |
3020 | ||
d83004aa JD |
3021 | /* |
3022 | * Write the metadata to the metadata cache. | |
3023 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
3024 | * The metadata cache lock protects us from concurrent read access from |
3025 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
3026 | * The content of the printf is printed as a single atomic metadata |
3027 | * transaction. | |
d83004aa | 3028 | */ |
a40e3229 | 3029 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
3030 | const char *fmt, ...) |
3031 | { | |
c099397a | 3032 | char *str; |
d83004aa | 3033 | size_t len; |
c099397a MD |
3034 | va_list ap; |
3035 | ||
585e5dcc | 3036 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
3037 | |
3038 | va_start(ap, fmt); | |
3039 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
3040 | va_end(ap); | |
3041 | if (!str) | |
3042 | return -ENOMEM; | |
3043 | ||
1ec3f75a | 3044 | len = strlen(str); |
a40e3229 MD |
3045 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3046 | if (session->priv->metadata_cache->metadata_written + len > | |
3047 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
3048 | char *tmp_cache_realloc; |
3049 | unsigned int tmp_cache_alloc_size; | |
3050 | ||
3051 | tmp_cache_alloc_size = max_t(unsigned int, | |
a40e3229 MD |
3052 | session->priv->metadata_cache->cache_alloc + len, |
3053 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 3054 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
3055 | if (!tmp_cache_realloc) |
3056 | goto err; | |
a40e3229 | 3057 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 3058 | memcpy(tmp_cache_realloc, |
a40e3229 MD |
3059 | session->priv->metadata_cache->data, |
3060 | session->priv->metadata_cache->cache_alloc); | |
3061 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
3062 | } |
3063 | ||
a40e3229 MD |
3064 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3065 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3066 | } |
a40e3229 MD |
3067 | memcpy(session->priv->metadata_cache->data + |
3068 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3069 | str, len); |
a40e3229 | 3070 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3071 | kfree(str); |
d83004aa | 3072 | |
d83004aa JD |
3073 | return 0; |
3074 | ||
3075 | err: | |
3076 | kfree(str); | |
3077 | return -ENOMEM; | |
c099397a MD |
3078 | } |
3079 | ||
f513b2bf | 3080 | static |
a40e3229 | 3081 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3082 | { |
3083 | size_t i; | |
3084 | ||
3085 | for (i = 0; i < nesting; i++) { | |
3086 | int ret; | |
3087 | ||
3088 | ret = lttng_metadata_printf(session, " "); | |
3089 | if (ret) { | |
3090 | return ret; | |
3091 | } | |
3092 | } | |
3093 | return 0; | |
3094 | } | |
3095 | ||
ceabb767 | 3096 | static |
a40e3229 | 3097 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3098 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3099 | size_t nesting) |
3100 | { | |
3101 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3102 | } | |
3103 | ||
3104 | static | |
a40e3229 | 3105 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3106 | const struct lttng_kernel_type_integer *type, |
3107 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3108 | size_t nesting) |
3109 | { | |
3110 | int ret; | |
3111 | ||
ceabb767 MD |
3112 | ret = print_tabs(session, nesting); |
3113 | if (ret) | |
3114 | return ret; | |
3115 | ret = lttng_metadata_printf(session, | |
3116 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3117 | type->size, |
3118 | type->alignment, | |
3119 | type->signedness, | |
3120 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3121 | ? "none" |
437d5aa5 | 3122 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3123 | ? "UTF8" |
3124 | : "ASCII", | |
437d5aa5 | 3125 | type->base, |
ceabb767 | 3126 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3127 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3128 | #else |
437d5aa5 | 3129 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3130 | #endif |
3131 | ); | |
3132 | return ret; | |
3133 | } | |
3134 | ||
f513b2bf MD |
3135 | /* |
3136 | * Must be called with sessions_mutex held. | |
3137 | */ | |
3138 | static | |
a40e3229 | 3139 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3140 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3141 | size_t nesting) |
3142 | { | |
f0039724 | 3143 | const char *prev_field_name = NULL; |
f513b2bf MD |
3144 | int ret; |
3145 | uint32_t i, nr_fields; | |
ceabb767 MD |
3146 | unsigned int alignment; |
3147 | ||
f513b2bf MD |
3148 | ret = print_tabs(session, nesting); |
3149 | if (ret) | |
3150 | return ret; | |
3151 | ret = lttng_metadata_printf(session, | |
3152 | "struct {\n"); | |
3153 | if (ret) | |
3154 | return ret; | |
437d5aa5 | 3155 | nr_fields = type->nr_fields; |
f513b2bf | 3156 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3157 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3158 | |
437d5aa5 | 3159 | iter_field = type->fields[i]; |
f0039724 | 3160 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3161 | if (ret) |
3162 | return ret; | |
3163 | } | |
3164 | ret = print_tabs(session, nesting); | |
3165 | if (ret) | |
3166 | return ret; | |
437d5aa5 | 3167 | alignment = type->alignment; |
ceabb767 MD |
3168 | if (alignment) { |
3169 | ret = lttng_metadata_printf(session, | |
3170 | "} align(%u)", | |
3171 | alignment); | |
3172 | } else { | |
3173 | ret = lttng_metadata_printf(session, | |
3174 | "}"); | |
3175 | } | |
f513b2bf MD |
3176 | return ret; |
3177 | } | |
3178 | ||
3179 | /* | |
3180 | * Must be called with sessions_mutex held. | |
3181 | */ | |
3182 | static | |
a40e3229 | 3183 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3184 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3185 | size_t nesting) |
3186 | { | |
3187 | int ret; | |
3188 | ||
3189 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3190 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3191 | if (ret) |
3192 | return ret; | |
ceabb767 | 3193 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3194 | } |
3195 | ||
65c85aa6 MD |
3196 | /* |
3197 | * Must be called with sessions_mutex held. | |
3198 | */ | |
3199 | static | |
a40e3229 | 3200 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3201 | const struct lttng_kernel_type_variant *type, |
f0039724 MD |
3202 | size_t nesting, |
3203 | const char *prev_field_name) | |
65c85aa6 | 3204 | { |
f0039724 | 3205 | const char *tag_name; |
65c85aa6 MD |
3206 | int ret; |
3207 | uint32_t i, nr_choices; | |
3208 | ||
f0039724 MD |
3209 | tag_name = type->tag_name; |
3210 | if (!tag_name) | |
3211 | tag_name = prev_field_name; | |
3212 | if (!tag_name) | |
3213 | return -EINVAL; | |
ceabb767 MD |
3214 | /* |
3215 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3216 | */ | |
437d5aa5 | 3217 | if (type->alignment != 0) |
ceabb767 | 3218 | return -EINVAL; |
65c85aa6 MD |
3219 | ret = print_tabs(session, nesting); |
3220 | if (ret) | |
3221 | return ret; | |
3222 | ret = lttng_metadata_printf(session, | |
3223 | "variant <_%s> {\n", | |
f0039724 | 3224 | tag_name); |
65c85aa6 MD |
3225 | if (ret) |
3226 | return ret; | |
437d5aa5 | 3227 | nr_choices = type->nr_choices; |
65c85aa6 | 3228 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3229 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3230 | |
437d5aa5 | 3231 | iter_field = type->choices[i]; |
f0039724 | 3232 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3233 | if (ret) |
3234 | return ret; | |
3235 | } | |
3236 | ret = print_tabs(session, nesting); | |
3237 | if (ret) | |
3238 | return ret; | |
3239 | ret = lttng_metadata_printf(session, | |
3240 | "}"); | |
3241 | return ret; | |
3242 | } | |
3243 | ||
3244 | /* | |
3245 | * Must be called with sessions_mutex held. | |
3246 | */ | |
3247 | static | |
a40e3229 | 3248 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3249 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3250 | size_t nesting, |
3251 | const char *prev_field_name) | |
65c85aa6 MD |
3252 | { |
3253 | int ret; | |
3254 | ||
3255 | ret = _lttng_variant_type_statedump(session, | |
f0039724 MD |
3256 | lttng_kernel_get_type_variant(field->type), nesting, |
3257 | prev_field_name); | |
65c85aa6 MD |
3258 | if (ret) |
3259 | return ret; | |
ceabb767 | 3260 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3261 | } |
3262 | ||
f513b2bf MD |
3263 | /* |
3264 | * Must be called with sessions_mutex held. | |
3265 | */ | |
3266 | static | |
a40e3229 | 3267 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3268 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3269 | size_t nesting) |
3270 | { | |
3271 | int ret; | |
437d5aa5 MD |
3272 | const struct lttng_kernel_type_array *array_type; |
3273 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3274 | |
437d5aa5 MD |
3275 | array_type = lttng_kernel_get_type_array(field->type); |
3276 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3277 | |
437d5aa5 | 3278 | if (array_type->alignment) { |
ceabb767 | 3279 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3280 | if (ret) |
3281 | return ret; | |
ceabb767 MD |
3282 | ret = lttng_metadata_printf(session, |
3283 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3284 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3285 | field->name); |
3286 | if (ret) | |
3287 | return ret; | |
3288 | } | |
3289 | /* | |
3290 | * Nested compound types: Only array of structures and variants are | |
3291 | * currently supported. | |
3292 | */ | |
437d5aa5 | 3293 | elem_type = array_type->elem_type; |
12bb2edb MD |
3294 | switch (elem_type->type) { |
3295 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3296 | case lttng_kernel_type_struct: |
3297 | case lttng_kernel_type_variant: | |
3298 | ret = _lttng_type_statedump(session, elem_type, | |
3299 | array_type->encoding, nesting); | |
65c85aa6 MD |
3300 | if (ret) |
3301 | return ret; | |
3302 | break; | |
ceabb767 | 3303 | |
f513b2bf MD |
3304 | default: |
3305 | return -EINVAL; | |
3306 | } | |
3307 | ret = lttng_metadata_printf(session, | |
3308 | " _%s[%u];\n", | |
3309 | field->name, | |
437d5aa5 | 3310 | array_type->length); |
f513b2bf MD |
3311 | return ret; |
3312 | } | |
3313 | ||
3314 | /* | |
3315 | * Must be called with sessions_mutex held. | |
3316 | */ | |
3317 | static | |
a40e3229 | 3318 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3319 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3320 | size_t nesting, |
3321 | const char *prev_field_name) | |
f513b2bf MD |
3322 | { |
3323 | int ret; | |
3324 | const char *length_name; | |
437d5aa5 MD |
3325 | const struct lttng_kernel_type_sequence *sequence_type; |
3326 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3327 | |
437d5aa5 MD |
3328 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3329 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3330 | |
437d5aa5 | 3331 | length_name = sequence_type->length_name; |
f0039724 MD |
3332 | if (!length_name) |
3333 | length_name = prev_field_name; | |
3334 | if (!length_name) | |
3335 | return -EINVAL; | |
ceabb767 | 3336 | |
437d5aa5 | 3337 | if (sequence_type->alignment) { |
ceabb767 | 3338 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3339 | if (ret) |
3340 | return ret; | |
ceabb767 MD |
3341 | ret = lttng_metadata_printf(session, |
3342 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3343 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3344 | field->name); |
3345 | if (ret) | |
3346 | return ret; | |
3347 | } | |
3348 | ||
3349 | /* | |
3350 | * Nested compound types: Only array of structures and variants are | |
3351 | * currently supported. | |
3352 | */ | |
437d5aa5 | 3353 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3354 | switch (elem_type->type) { |
3355 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3356 | case lttng_kernel_type_struct: |
3357 | case lttng_kernel_type_variant: | |
3358 | ret = _lttng_type_statedump(session, elem_type, | |
3359 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3360 | if (ret) |
3361 | return ret; | |
3362 | break; | |
ceabb767 | 3363 | |
f513b2bf MD |
3364 | default: |
3365 | return -EINVAL; | |
3366 | } | |
3367 | ret = lttng_metadata_printf(session, | |
3368 | " _%s[ _%s ];\n", | |
3369 | field->name, | |
f0039724 | 3370 | length_name); |
f513b2bf MD |
3371 | return ret; |
3372 | } | |
3373 | ||
141ddf28 MD |
3374 | /* |
3375 | * Must be called with sessions_mutex held. | |
3376 | */ | |
3377 | static | |
a40e3229 | 3378 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3379 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3380 | size_t nesting) |
3381 | { | |
d96a4a7a | 3382 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3383 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3384 | int ret; |
3385 | unsigned int i, nr_entries; | |
3386 | ||
437d5aa5 | 3387 | container_type = type->container_type; |
12bb2edb | 3388 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3389 | ret = -EINVAL; |
3390 | goto end; | |
3391 | } | |
437d5aa5 | 3392 | enum_desc = type->desc; |
141ddf28 MD |
3393 | nr_entries = enum_desc->nr_entries; |
3394 | ||
3395 | ret = print_tabs(session, nesting); | |
3396 | if (ret) | |
3397 | goto end; | |
ceabb767 MD |
3398 | ret = lttng_metadata_printf(session, "enum : "); |
3399 | if (ret) | |
3400 | goto end; | |
437d5aa5 MD |
3401 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3402 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3403 | if (ret) |
ceabb767 MD |
3404 | goto end; |
3405 | ret = lttng_metadata_printf(session, " {\n"); | |
3406 | if (ret) | |
3407 | goto end; | |
141ddf28 MD |
3408 | /* Dump all entries */ |
3409 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3410 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3411 | int j, len; |
3412 | ||
3413 | ret = print_tabs(session, nesting + 1); | |
3414 | if (ret) | |
3415 | goto end; | |
3416 | ret = lttng_metadata_printf(session, | |
3417 | "\""); | |
3418 | if (ret) | |
3419 | goto end; | |
3420 | len = strlen(entry->string); | |
3421 | /* Escape the character '"' */ | |
3422 | for (j = 0; j < len; j++) { | |
3423 | char c = entry->string[j]; | |
3424 | ||
3425 | switch (c) { | |
3426 | case '"': | |
3427 | ret = lttng_metadata_printf(session, | |
3428 | "\\\""); | |
3429 | break; | |
3430 | case '\\': | |
3431 | ret = lttng_metadata_printf(session, | |
3432 | "\\\\"); | |
3433 | break; | |
3434 | default: | |
3435 | ret = lttng_metadata_printf(session, | |
3436 | "%c", c); | |
3437 | break; | |
3438 | } | |
3439 | if (ret) | |
3440 | goto end; | |
3441 | } | |
08ad1061 PP |
3442 | ret = lttng_metadata_printf(session, "\""); |
3443 | if (ret) | |
3444 | goto end; | |
3445 | ||
3446 | if (entry->options.is_auto) { | |
3447 | ret = lttng_metadata_printf(session, ",\n"); | |
3448 | if (ret) | |
3449 | goto end; | |
141ddf28 | 3450 | } else { |
7c559490 MD |
3451 | ret = lttng_metadata_printf(session, |
3452 | " = "); | |
3453 | if (ret) | |
3454 | goto end; | |
3455 | if (entry->start.signedness) | |
141ddf28 | 3456 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3457 | "%lld", (long long) entry->start.value); |
3458 | else | |
3459 | ret = lttng_metadata_printf(session, | |
3460 | "%llu", entry->start.value); | |
3461 | if (ret) | |
3462 | goto end; | |
3463 | if (entry->start.signedness == entry->end.signedness && | |
3464 | entry->start.value | |
3465 | == entry->end.value) { | |
141ddf28 | 3466 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3467 | ",\n"); |
3468 | } else { | |
3469 | if (entry->end.signedness) { | |
3470 | ret = lttng_metadata_printf(session, | |
3471 | " ... %lld,\n", | |
3472 | (long long) entry->end.value); | |
3473 | } else { | |
3474 | ret = lttng_metadata_printf(session, | |
3475 | " ... %llu,\n", | |
3476 | entry->end.value); | |
3477 | } | |
141ddf28 | 3478 | } |
7c559490 MD |
3479 | if (ret) |
3480 | goto end; | |
141ddf28 | 3481 | } |
141ddf28 MD |
3482 | } |
3483 | ret = print_tabs(session, nesting); | |
3484 | if (ret) | |
3485 | goto end; | |
ceabb767 | 3486 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3487 | end: |
3488 | return ret; | |
3489 | } | |
3490 | ||
d83004aa JD |
3491 | /* |
3492 | * Must be called with sessions_mutex held. | |
3493 | */ | |
c099397a | 3494 | static |
a40e3229 | 3495 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3496 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3497 | size_t nesting) |
3498 | { | |
3499 | int ret; | |
437d5aa5 | 3500 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3501 | |
437d5aa5 MD |
3502 | enum_type = lttng_kernel_get_type_enum(field->type); |
3503 | WARN_ON_ONCE(!enum_type); | |
3504 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3505 | if (ret) |
3506 | return ret; | |
3507 | return lttng_field_name_statedump(session, field, nesting); | |
3508 | } | |
3509 | ||
3510 | static | |
a40e3229 | 3511 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3512 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3513 | size_t nesting) |
3514 | { | |
3515 | int ret; | |
3516 | ||
437d5aa5 MD |
3517 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3518 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3519 | if (ret) |
3520 | return ret; | |
3521 | return lttng_field_name_statedump(session, field, nesting); | |
3522 | } | |
3523 | ||
3524 | static | |
a40e3229 | 3525 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3526 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3527 | size_t nesting) |
3528 | { | |
3529 | int ret; | |
3530 | ||
ceabb767 MD |
3531 | /* Default encoding is UTF8 */ |
3532 | ret = print_tabs(session, nesting); | |
3533 | if (ret) | |
3534 | return ret; | |
3535 | ret = lttng_metadata_printf(session, | |
3536 | "string%s", | |
437d5aa5 | 3537 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3538 | " { encoding = ASCII; }" : ""); |
3539 | return ret; | |
3540 | } | |
3541 | ||
3542 | static | |
a40e3229 | 3543 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3544 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3545 | size_t nesting) |
ceabb767 | 3546 | { |
437d5aa5 | 3547 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3548 | int ret; |
3549 | ||
437d5aa5 MD |
3550 | string_type = lttng_kernel_get_type_string(field->type); |
3551 | WARN_ON_ONCE(!string_type); | |
3552 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3553 | if (ret) |
3554 | return ret; | |
3555 | return lttng_field_name_statedump(session, field, nesting); | |
3556 | } | |
3557 | ||
3558 | /* | |
3559 | * Must be called with sessions_mutex held. | |
3560 | */ | |
3561 | static | |
a40e3229 | 3562 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3563 | const struct lttng_kernel_type_common *type, |
3564 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3565 | size_t nesting) |
c099397a | 3566 | { |
c099397a | 3567 | int ret = 0; |
c099397a | 3568 | |
12bb2edb MD |
3569 | switch (type->type) { |
3570 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3571 | ret = _lttng_integer_type_statedump(session, |
3572 | lttng_kernel_get_type_integer(type), | |
3573 | parent_encoding, nesting); | |
8070f5c0 | 3574 | break; |
437d5aa5 MD |
3575 | case lttng_kernel_type_enum: |
3576 | ret = _lttng_enum_type_statedump(session, | |
3577 | lttng_kernel_get_type_enum(type), | |
3578 | nesting); | |
8070f5c0 | 3579 | break; |
12bb2edb | 3580 | case lttng_kernel_type_string: |
437d5aa5 MD |
3581 | ret = _lttng_string_type_statedump(session, |
3582 | lttng_kernel_get_type_string(type), | |
3583 | nesting); | |
ceabb767 | 3584 | break; |
437d5aa5 MD |
3585 | case lttng_kernel_type_struct: |
3586 | ret = _lttng_struct_type_statedump(session, | |
3587 | lttng_kernel_get_type_struct(type), | |
3588 | nesting); | |
8070f5c0 | 3589 | break; |
437d5aa5 MD |
3590 | case lttng_kernel_type_variant: |
3591 | ret = _lttng_variant_type_statedump(session, | |
3592 | lttng_kernel_get_type_variant(type), | |
f0039724 | 3593 | nesting, NULL); |
ceabb767 MD |
3594 | break; |
3595 | ||
3596 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3597 | case lttng_kernel_type_array: |
3598 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3599 | default: |
3600 | WARN_ON_ONCE(1); | |
3601 | return -EINVAL; | |
8070f5c0 | 3602 | } |
ceabb767 MD |
3603 | return ret; |
3604 | } | |
8070f5c0 | 3605 | |
ceabb767 MD |
3606 | /* |
3607 | * Must be called with sessions_mutex held. | |
3608 | */ | |
3609 | static | |
a40e3229 | 3610 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3611 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3612 | size_t nesting, |
3613 | const char **prev_field_name_p) | |
ceabb767 | 3614 | { |
f0039724 | 3615 | const char *prev_field_name = NULL; |
ceabb767 | 3616 | int ret = 0; |
27d2368e | 3617 | |
f0039724 MD |
3618 | if (prev_field_name_p) |
3619 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3620 | switch (field->type->type) { |
12bb2edb | 3621 | case lttng_kernel_type_integer: |
ceabb767 MD |
3622 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3623 | break; | |
437d5aa5 | 3624 | case lttng_kernel_type_enum: |
ceabb767 | 3625 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3626 | break; |
12bb2edb | 3627 | case lttng_kernel_type_string: |
ceabb767 | 3628 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3629 | break; |
437d5aa5 | 3630 | case lttng_kernel_type_struct: |
ceabb767 | 3631 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3632 | break; |
437d5aa5 | 3633 | case lttng_kernel_type_array: |
ceabb767 | 3634 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3635 | break; |
437d5aa5 | 3636 | case lttng_kernel_type_sequence: |
f0039724 | 3637 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3638 | break; |
437d5aa5 | 3639 | case lttng_kernel_type_variant: |
f0039724 | 3640 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3641 | break; |
f513b2bf | 3642 | |
8070f5c0 MD |
3643 | default: |
3644 | WARN_ON_ONCE(1); | |
3645 | return -EINVAL; | |
3646 | } | |
f0039724 MD |
3647 | if (prev_field_name_p) |
3648 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3649 | return ret; |
3650 | } | |
3651 | ||
3652 | static | |
a40e3229 | 3653 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3654 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3655 | { |
f0039724 | 3656 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3657 | int ret = 0; |
3658 | int i; | |
3659 | ||
3660 | if (!ctx) | |
3661 | return 0; | |
3662 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3663 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3664 | |
f0039724 | 3665 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3666 | if (ret) |
3667 | return ret; | |
3668 | } | |
3669 | return ret; | |
3670 | } | |
3671 | ||
3672 | static | |
a40e3229 | 3673 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3674 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3675 | { |
f0039724 | 3676 | const char *prev_field_name = NULL; |
a67ba386 | 3677 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3678 | int ret = 0; |
3679 | int i; | |
3680 | ||
e69abdfd MD |
3681 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3682 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3683 | |
f0039724 | 3684 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3685 | if (ret) |
3686 | return ret; | |
c099397a MD |
3687 | } |
3688 | return ret; | |
3689 | } | |
3690 | ||
d83004aa JD |
3691 | /* |
3692 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3693 | * The entire event metadata is printed as a single atomic metadata |
3694 | * transaction. | |
d83004aa | 3695 | */ |
c099397a | 3696 | static |
a40e3229 | 3697 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 3698 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3699 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3700 | { |
3701 | int ret = 0; | |
3702 | ||
a67ba386 | 3703 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3704 | return 0; |
ac847066 | 3705 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3706 | return 0; |
3707 | ||
8b97fd42 MD |
3708 | lttng_metadata_begin(session); |
3709 | ||
c099397a MD |
3710 | ret = lttng_metadata_printf(session, |
3711 | "event {\n" | |
ae734547 | 3712 | " name = \"%s\";\n" |
c099397a | 3713 | " id = %u;\n" |
b9074a1b | 3714 | " stream_id = %u;\n", |
a67ba386 MD |
3715 | event_recorder->priv->parent.desc->event_name, |
3716 | event_recorder->priv->id, | |
ac847066 | 3717 | event_recorder->chan->priv->id); |
c099397a MD |
3718 | if (ret) |
3719 | goto end; | |
3720 | ||
8070f5c0 | 3721 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3722 | " fields := struct {\n" |
3723 | ); | |
3724 | if (ret) | |
3725 | goto end; | |
3726 | ||
a67ba386 | 3727 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3728 | if (ret) |
3729 | goto end; | |
3730 | ||
3731 | /* | |
3732 | * LTTng space reservation can only reserve multiples of the | |
3733 | * byte size. | |
3734 | */ | |
3735 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3736 | " };\n" |
3737 | "};\n\n"); | |
c099397a MD |
3738 | if (ret) |
3739 | goto end; | |
3740 | ||
a67ba386 | 3741 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3742 | end: |
8b97fd42 | 3743 | lttng_metadata_end(session); |
c099397a MD |
3744 | return ret; |
3745 | ||
3746 | } | |
3747 | ||
d83004aa JD |
3748 | /* |
3749 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3750 | * The entire channel metadata is printed as a single atomic metadata |
3751 | * transaction. | |
d83004aa | 3752 | */ |
c099397a | 3753 | static |
a40e3229 | 3754 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 3755 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3756 | { |
3757 | int ret = 0; | |
3758 | ||
ac847066 | 3759 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3760 | return 0; |
d83004aa | 3761 | |
ac847066 | 3762 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3763 | return 0; |
3764 | ||
8b97fd42 MD |
3765 | lttng_metadata_begin(session); |
3766 | ||
ac847066 | 3767 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3768 | ret = lttng_metadata_printf(session, |
3769 | "stream {\n" | |
3770 | " id = %u;\n" | |
9115fbdc | 3771 | " event.header := %s;\n" |
b9074a1b | 3772 | " packet.context := struct packet_context;\n", |
ac847066 MD |
3773 | chan->priv->id, |
3774 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3775 | "struct event_header_large"); |
3776 | if (ret) | |
3777 | goto end; | |
3778 | ||
ac847066 | 3779 | if (chan->priv->ctx) { |
b9074a1b MD |
3780 | ret = lttng_metadata_printf(session, |
3781 | " event.context := struct {\n"); | |
3782 | if (ret) | |
3783 | goto end; | |
3784 | } | |
ac847066 | 3785 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3786 | if (ret) |
3787 | goto end; | |
ac847066 | 3788 | if (chan->priv->ctx) { |
b9074a1b MD |
3789 | ret = lttng_metadata_printf(session, |
3790 | " };\n"); | |
3791 | if (ret) | |
3792 | goto end; | |
3793 | } | |
8070f5c0 MD |
3794 | |
3795 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3796 | "};\n\n"); |
8070f5c0 | 3797 | |
ac847066 | 3798 | chan->priv->metadata_dumped = 1; |
c099397a | 3799 | end: |
8b97fd42 | 3800 | lttng_metadata_end(session); |
c099397a MD |
3801 | return ret; |
3802 | } | |
3803 | ||
d83004aa JD |
3804 | /* |
3805 | * Must be called with sessions_mutex held. | |
3806 | */ | |
9115fbdc | 3807 | static |
a40e3229 | 3808 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3809 | { |
3810 | return lttng_metadata_printf(session, | |
3811 | "struct packet_context {\n" | |
a3ccff4f MD |
3812 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3813 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3814 | " uint64_t content_size;\n" |
3815 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3816 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3817 | " unsigned long events_discarded;\n" |
9115fbdc | 3818 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3819 | "};\n\n" |
9115fbdc MD |
3820 | ); |
3821 | } | |
3822 | ||
3823 | /* | |
3824 | * Compact header: | |
3825 | * id: range: 0 - 30. | |
3826 | * id 31 is reserved to indicate an extended header. | |
3827 | * | |
3828 | * Large header: | |
3829 | * id: range: 0 - 65534. | |
3830 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3831 | * |
3832 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3833 | */ |
3834 | static | |
a40e3229 | 3835 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3836 | { |
3837 | return lttng_metadata_printf(session, | |
3838 | "struct event_header_compact {\n" | |
3839 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3840 | " variant <id> {\n" | |
3841 | " struct {\n" | |
a3ccff4f | 3842 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3843 | " } compact;\n" |
3844 | " struct {\n" | |
3845 | " uint32_t id;\n" | |
a3ccff4f | 3846 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3847 | " } extended;\n" |
3848 | " } v;\n" | |
3849 | "} align(%u);\n" | |
3850 | "\n" | |
3851 | "struct event_header_large {\n" | |
3852 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3853 | " variant <id> {\n" | |
3854 | " struct {\n" | |
a3ccff4f | 3855 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3856 | " } compact;\n" |
3857 | " struct {\n" | |
3858 | " uint32_t id;\n" | |
a3ccff4f | 3859 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3860 | " } extended;\n" |
3861 | " } v;\n" | |
3862 | "} align(%u);\n\n", | |
a90917c3 MD |
3863 | lttng_alignof(uint32_t) * CHAR_BIT, |
3864 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3865 | ); |
3866 | } | |
3867 | ||
a3ccff4f MD |
3868 | /* |
3869 | * Approximation of NTP time of day to clock monotonic correlation, | |
3870 | * taken at start of trace. | |
3871 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3872 | * in future versions. | |
5283350b MD |
3873 | * This function may return a negative offset. It may happen if the |
3874 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3875 | * |
3876 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3877 | * y2038 compliant. | |
a3ccff4f MD |
3878 | */ |
3879 | static | |
8967b2a3 | 3880 | int64_t measure_clock_offset(void) |
a3ccff4f | 3881 | { |
dcb93448 | 3882 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3883 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3884 | int64_t offset; |
a3ccff4f | 3885 | unsigned long flags; |
3636085f MJ |
3886 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3887 | struct timespec64 rts = { 0, 0 }; | |
3888 | #else | |
3889 | struct timespec rts = { 0, 0 }; | |
3890 | #endif | |
a3ccff4f MD |
3891 | |
3892 | /* Disable interrupts to increase correlation precision. */ | |
3893 | local_irq_save(flags); | |
3894 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3895 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3896 | ktime_get_real_ts64(&rts); | |
3897 | #else | |
216b6baa | 3898 | getnstimeofday(&rts); |
3636085f | 3899 | #endif |
a3ccff4f MD |
3900 | monotonic[1] = trace_clock_read64(); |
3901 | local_irq_restore(flags); | |
3902 | ||
dcb93448 | 3903 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3904 | realtime = (uint64_t) rts.tv_sec * tcf; |
3905 | if (tcf == NSEC_PER_SEC) { | |
3906 | realtime += rts.tv_nsec; | |
3907 | } else { | |
3908 | uint64_t n = rts.tv_nsec * tcf; | |
3909 | ||
3910 | do_div(n, NSEC_PER_SEC); | |
3911 | realtime += n; | |
3912 | } | |
dcb93448 | 3913 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3914 | return offset; |
3915 | } | |
3916 | ||
3eb95be4 | 3917 | static |
a40e3229 | 3918 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3919 | { |
0f3eaad4 | 3920 | int ret = 0; |
3eb95be4 JR |
3921 | size_t i; |
3922 | char cur; | |
3923 | ||
3924 | i = 0; | |
3925 | cur = string[i]; | |
3926 | while (cur != '\0') { | |
3927 | switch (cur) { | |
3928 | case '\n': | |
3929 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3930 | break; | |
3931 | case '\\': | |
3932 | case '"': | |
3933 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3934 | if (ret) | |
3935 | goto error; | |
3936 | /* We still print the current char */ | |
c570be0d | 3937 | lttng_fallthrough; |
3eb95be4 JR |
3938 | default: |
3939 | ret = lttng_metadata_printf(session, "%c", cur); | |
3940 | break; | |
3941 | } | |
3942 | ||
3943 | if (ret) | |
3944 | goto error; | |
3945 | ||
3946 | cur = string[++i]; | |
3947 | } | |
3948 | error: | |
3949 | return ret; | |
3950 | } | |
3951 | ||
3952 | static | |
a40e3229 | 3953 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3954 | const char *field_value) |
3eb95be4 JR |
3955 | { |
3956 | int ret; | |
3957 | ||
1c88f269 | 3958 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3959 | if (ret) |
3960 | goto error; | |
3961 | ||
1c88f269 | 3962 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3963 | if (ret) |
3964 | goto error; | |
3965 | ||
3966 | ret = lttng_metadata_printf(session, "\";\n"); | |
3967 | ||
3968 | error: | |
3969 | return ret; | |
3970 | } | |
3971 | ||
c099397a MD |
3972 | /* |
3973 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3974 | * Must be called with sessions_mutex held. |
c099397a MD |
3975 | */ |
3976 | static | |
a40e3229 | 3977 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3978 | { |
a40e3229 | 3979 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3980 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3981 | const char *product_uuid; |
ac847066 | 3982 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3983 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3984 | int ret = 0; |
3985 | ||
585e5dcc | 3986 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3987 | return 0; |
8b97fd42 MD |
3988 | |
3989 | lttng_metadata_begin(session); | |
3990 | ||
a40e3229 | 3991 | if (session->priv->metadata_dumped) |
c099397a | 3992 | goto skip_session; |
c099397a | 3993 | |
d793d5e1 | 3994 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3995 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3996 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3997 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3998 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3999 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
4000 | |
4001 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
4002 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
4003 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
4004 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
4005 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 4006 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
4007 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
4008 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
4009 | "\n" |
4010 | "trace {\n" | |
4011 | " major = %u;\n" | |
4012 | " minor = %u;\n" | |
30bdb6e4 | 4013 | " uuid = \"%s\";\n" |
d793d5e1 MD |
4014 | " byte_order = %s;\n" |
4015 | " packet.header := struct {\n" | |
4016 | " uint32_t magic;\n" | |
1ec3f75a | 4017 | " uint8_t uuid[16];\n" |
d793d5e1 | 4018 | " uint32_t stream_id;\n" |
5594698f | 4019 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 4020 | " };\n" |
d793d5e1 | 4021 | "};\n\n", |
a90917c3 MD |
4022 | lttng_alignof(uint8_t) * CHAR_BIT, |
4023 | lttng_alignof(uint16_t) * CHAR_BIT, | |
4024 | lttng_alignof(uint32_t) * CHAR_BIT, | |
4025 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
4026 | sizeof(unsigned long) * CHAR_BIT, |
4027 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
4028 | CTF_SPEC_MAJOR, |
4029 | CTF_SPEC_MINOR, | |
d793d5e1 | 4030 | uuid_s, |
5214fa50 | 4031 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
4032 | "be" |
4033 | #else | |
4034 | "le" | |
4035 | #endif | |
4036 | ); | |
4037 | if (ret) | |
4038 | goto end; | |
4039 | ||
99dc9597 MD |
4040 | ret = lttng_metadata_printf(session, |
4041 | "env {\n" | |
a6058143 | 4042 | " hostname = \"%s\";\n" |
c6c9e10f | 4043 | " domain = \"kernel\";\n" |
99dc9597 | 4044 | " sysname = \"%s\";\n" |
c6c9e10f MD |
4045 | " kernel_release = \"%s\";\n" |
4046 | " kernel_version = \"%s\";\n" | |
4047 | " tracer_name = \"lttng-modules\";\n" | |
4048 | " tracer_major = %d;\n" | |
4049 | " tracer_minor = %d;\n" | |
4050 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 4051 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 4052 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
4053 | utsname()->sysname, |
4054 | utsname()->release, | |
c6c9e10f MD |
4055 | utsname()->version, |
4056 | LTTNG_MODULES_MAJOR_VERSION, | |
4057 | LTTNG_MODULES_MINOR_VERSION, | |
4058 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
4059 | ); |
4060 | if (ret) | |
4061 | goto end; | |
4062 | ||
a40e3229 | 4063 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
4064 | if (ret) |
4065 | goto end; | |
4066 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
a40e3229 | 4067 | session->priv->creation_time); |
3eb95be4 JR |
4068 | if (ret) |
4069 | goto end; | |
4070 | ||
c88f762e GB |
4071 | /* Add the product UUID to the 'env' section */ |
4072 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4073 | if (product_uuid) { | |
4074 | ret = lttng_metadata_printf(session, | |
4075 | " product_uuid = \"%s\";\n", | |
4076 | product_uuid | |
4077 | ); | |
4078 | if (ret) | |
4079 | goto end; | |
4080 | } | |
4081 | ||
4082 | /* Close the 'env' section */ | |
3eb95be4 JR |
4083 | ret = lttng_metadata_printf(session, "};\n\n"); |
4084 | if (ret) | |
4085 | goto end; | |
4086 | ||
a3ccff4f MD |
4087 | ret = lttng_metadata_printf(session, |
4088 | "clock {\n" | |
2754583e MD |
4089 | " name = \"%s\";\n", |
4090 | trace_clock_name() | |
a82c63f1 MD |
4091 | ); |
4092 | if (ret) | |
4093 | goto end; | |
4094 | ||
4095 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4096 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4097 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4098 | clock_uuid_s |
4099 | ); | |
4100 | if (ret) | |
4101 | goto end; | |
4102 | } | |
4103 | ||
4104 | ret = lttng_metadata_printf(session, | |
2754583e | 4105 | " description = \"%s\";\n" |
a3ccff4f MD |
4106 | " freq = %llu; /* Frequency, in Hz */\n" |
4107 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4108 | " offset = %lld;\n" |
a3ccff4f | 4109 | "};\n\n", |
2754583e | 4110 | trace_clock_description(), |
a3ccff4f | 4111 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4112 | (long long) measure_clock_offset() |
a3ccff4f MD |
4113 | ); |
4114 | if (ret) | |
4115 | goto end; | |
4116 | ||
4117 | ret = lttng_metadata_printf(session, | |
4118 | "typealias integer {\n" | |
4119 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4120 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4121 | "} := uint27_clock_monotonic_t;\n" |
4122 | "\n" | |
4123 | "typealias integer {\n" | |
4124 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4125 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4126 | "} := uint32_clock_monotonic_t;\n" |
4127 | "\n" | |
4128 | "typealias integer {\n" | |
4129 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4130 | " map = clock.%s.value;\n" |
a3ccff4f | 4131 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4132 | trace_clock_name(), |
a3ccff4f | 4133 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4134 | trace_clock_name(), |
4135 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4136 | trace_clock_name() | |
a3ccff4f MD |
4137 | ); |
4138 | if (ret) | |
4139 | goto end; | |
4140 | ||
a90917c3 | 4141 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4142 | if (ret) |
4143 | goto end; | |
4144 | ||
a90917c3 | 4145 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4146 | if (ret) |
4147 | goto end; | |
4148 | ||
c099397a | 4149 | skip_session: |
ac847066 MD |
4150 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4151 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4152 | if (ret) |
4153 | goto end; | |
4154 | } | |
4155 | ||
a40e3229 | 4156 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4157 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4158 | event_recorder_priv->pub); | |
c099397a MD |
4159 | if (ret) |
4160 | goto end; | |
4161 | } | |
a40e3229 | 4162 | session->priv->metadata_dumped = 1; |
c099397a | 4163 | end: |
8b97fd42 | 4164 | lttng_metadata_end(session); |
c099397a MD |
4165 | return ret; |
4166 | } | |
4167 | ||
c0e31d2e | 4168 | /** |
a90917c3 | 4169 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4170 | * @transport: transport structure |
4171 | * | |
4172 | * Registers a transport which can be used as output to extract the data out of | |
4173 | * LTTng. The module calling this registration function must ensure that no | |
4174 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4175 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4176 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4177 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4178 | * after its registration must it synchronize the TLBs. |
4179 | */ | |
a90917c3 | 4180 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4181 | { |
4182 | /* | |
4183 | * Make sure no page fault can be triggered by the module about to be | |
4184 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4185 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4186 | */ |
263b6c88 | 4187 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4188 | |
4189 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4190 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4191 | mutex_unlock(&sessions_mutex); |
4192 | } | |
a90917c3 | 4193 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4194 | |
4195 | /** | |
a90917c3 | 4196 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4197 | * @transport: transport structure |
4198 | */ | |
a90917c3 | 4199 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4200 | { |
4201 | mutex_lock(&sessions_mutex); | |
4202 | list_del(&transport->node); | |
4203 | mutex_unlock(&sessions_mutex); | |
4204 | } | |
a90917c3 | 4205 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4206 | |
a101fa10 MD |
4207 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4208 | { | |
4209 | /* | |
4210 | * Make sure no page fault can be triggered by the module about to be | |
4211 | * registered. We deal with this here so we don't have to call | |
4212 | * vmalloc_sync_mappings() in each module's init. | |
4213 | */ | |
4214 | wrapper_vmalloc_sync_mappings(); | |
4215 | ||
4216 | mutex_lock(&sessions_mutex); | |
4217 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4218 | mutex_unlock(&sessions_mutex); | |
4219 | } | |
4220 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4221 | ||
4222 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4223 | { | |
4224 | mutex_lock(&sessions_mutex); | |
4225 | list_del(&transport->node); | |
4226 | mutex_unlock(&sessions_mutex); | |
4227 | } | |
4228 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4229 | ||
5f4c791e | 4230 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4231 | |
4232 | enum cpuhp_state lttng_hp_prepare; | |
4233 | enum cpuhp_state lttng_hp_online; | |
4234 | ||
4235 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4236 | { | |
4237 | struct lttng_cpuhp_node *lttng_node; | |
4238 | ||
4239 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4240 | switch (lttng_node->component) { | |
4241 | case LTTNG_RING_BUFFER_FRONTEND: | |
4242 | return 0; | |
4243 | case LTTNG_RING_BUFFER_BACKEND: | |
4244 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4245 | case LTTNG_RING_BUFFER_ITER: | |
4246 | return 0; | |
4247 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4248 | return 0; | |
4249 | default: | |
4250 | return -EINVAL; | |
4251 | } | |
4252 | } | |
4253 | ||
4254 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4255 | { | |
4256 | struct lttng_cpuhp_node *lttng_node; | |
4257 | ||
4258 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4259 | switch (lttng_node->component) { | |
4260 | case LTTNG_RING_BUFFER_FRONTEND: | |
4261 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4262 | case LTTNG_RING_BUFFER_BACKEND: | |
4263 | return 0; | |
4264 | case LTTNG_RING_BUFFER_ITER: | |
4265 | return 0; | |
4266 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4267 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4268 | default: | |
4269 | return -EINVAL; | |
4270 | } | |
4271 | } | |
4272 | ||
4273 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4274 | { | |
4275 | struct lttng_cpuhp_node *lttng_node; | |
4276 | ||
4277 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4278 | switch (lttng_node->component) { | |
4279 | case LTTNG_RING_BUFFER_FRONTEND: | |
4280 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4281 | case LTTNG_RING_BUFFER_BACKEND: | |
4282 | return 0; | |
4283 | case LTTNG_RING_BUFFER_ITER: | |
4284 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4285 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4286 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4287 | default: | |
4288 | return -EINVAL; | |
4289 | } | |
4290 | } | |
4291 | ||
4292 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4293 | { | |
4294 | struct lttng_cpuhp_node *lttng_node; | |
4295 | ||
4296 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4297 | switch (lttng_node->component) { | |
4298 | case LTTNG_RING_BUFFER_FRONTEND: | |
4299 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4300 | case LTTNG_RING_BUFFER_BACKEND: | |
4301 | return 0; | |
4302 | case LTTNG_RING_BUFFER_ITER: | |
4303 | return 0; | |
4304 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4305 | return 0; | |
4306 | default: | |
4307 | return -EINVAL; | |
4308 | } | |
4309 | } | |
4310 | ||
4311 | static int __init lttng_init_cpu_hotplug(void) | |
4312 | { | |
4313 | int ret; | |
4314 | ||
4315 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4316 | lttng_hotplug_prepare, | |
4317 | lttng_hotplug_dead); | |
4318 | if (ret < 0) { | |
4319 | return ret; | |
4320 | } | |
4321 | lttng_hp_prepare = ret; | |
4322 | lttng_rb_set_hp_prepare(ret); | |
4323 | ||
4324 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4325 | lttng_hotplug_online, | |
4326 | lttng_hotplug_offline); | |
4327 | if (ret < 0) { | |
4328 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4329 | lttng_hp_prepare = 0; | |
4330 | return ret; | |
4331 | } | |
4332 | lttng_hp_online = ret; | |
4333 | lttng_rb_set_hp_online(ret); | |
4334 | ||
4335 | return 0; | |
4336 | } | |
4337 | ||
4338 | static void __exit lttng_exit_cpu_hotplug(void) | |
4339 | { | |
4340 | lttng_rb_set_hp_online(0); | |
4341 | cpuhp_remove_multi_state(lttng_hp_online); | |
4342 | lttng_rb_set_hp_prepare(0); | |
4343 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4344 | } | |
4345 | ||
5f4c791e | 4346 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4347 | static int lttng_init_cpu_hotplug(void) |
4348 | { | |
4349 | return 0; | |
4350 | } | |
4351 | static void lttng_exit_cpu_hotplug(void) | |
4352 | { | |
4353 | } | |
5f4c791e | 4354 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4355 | |
a90917c3 | 4356 | static int __init lttng_events_init(void) |
4e3c1b9b | 4357 | { |
1c25284c MD |
4358 | int ret; |
4359 | ||
453b2495 JD |
4360 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4361 | if (ret) | |
4362 | return ret; | |
389d7070 | 4363 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4364 | if (ret) |
4365 | return ret; | |
4366 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4367 | if (ret) |
4368 | return ret; | |
4369 | ret = lttng_probes_init(); | |
389d7070 MD |
4370 | if (ret) |
4371 | return ret; | |
07dfc1d0 | 4372 | ret = lttng_context_init(); |
20591cf7 MD |
4373 | if (ret) |
4374 | return ret; | |
07dfc1d0 MD |
4375 | ret = lttng_tracepoint_init(); |
4376 | if (ret) | |
4377 | goto error_tp; | |
a67ba386 MD |
4378 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4379 | if (!event_recorder_cache) { | |
20591cf7 | 4380 | ret = -ENOMEM; |
a67ba386 | 4381 | goto error_kmem_event_recorder; |
dffef45d | 4382 | } |
a67ba386 MD |
4383 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4384 | if (!event_recorder_private_cache) { | |
4385 | ret = -ENOMEM; | |
4386 | goto error_kmem_event_recorder_private; | |
4387 | } | |
4388 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4389 | if (!event_notifier_cache) { |
4390 | ret = -ENOMEM; | |
4391 | goto error_kmem_event_notifier; | |
20591cf7 | 4392 | } |
a67ba386 MD |
4393 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4394 | if (!event_notifier_private_cache) { | |
4395 | ret = -ENOMEM; | |
4396 | goto error_kmem_event_notifier_private; | |
4397 | } | |
80996790 | 4398 | ret = lttng_abi_init(); |
02119ee5 MD |
4399 | if (ret) |
4400 | goto error_abi; | |
0c956676 MD |
4401 | ret = lttng_logger_init(); |
4402 | if (ret) | |
4403 | goto error_logger; | |
1e367326 MD |
4404 | ret = lttng_init_cpu_hotplug(); |
4405 | if (ret) | |
4406 | goto error_hotplug; | |
101215b7 | 4407 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4408 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4409 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4410 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4411 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4412 | LTTNG_VERSION_NAME, |
4413 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4414 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4415 | #else | |
4416 | "", | |
4417 | #endif | |
4418 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4419 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4420 | #else | |
4421 | ""); | |
4422 | #endif | |
f73c5a43 MJ |
4423 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4424 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4425 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4426 | return 0; |
0c956676 | 4427 | |
1e367326 MD |
4428 | error_hotplug: |
4429 | lttng_logger_exit(); | |
0c956676 MD |
4430 | error_logger: |
4431 | lttng_abi_exit(); | |
02119ee5 | 4432 | error_abi: |
a67ba386 MD |
4433 | kmem_cache_destroy(event_notifier_private_cache); |
4434 | error_kmem_event_notifier_private: | |
dffef45d FD |
4435 | kmem_cache_destroy(event_notifier_cache); |
4436 | error_kmem_event_notifier: | |
a67ba386 MD |
4437 | kmem_cache_destroy(event_recorder_private_cache); |
4438 | error_kmem_event_recorder_private: | |
4439 | kmem_cache_destroy(event_recorder_cache); | |
4440 | error_kmem_event_recorder: | |
20591cf7 | 4441 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4442 | error_tp: |
4443 | lttng_context_exit(); | |
101215b7 | 4444 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4445 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4446 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4447 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4448 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4449 | LTTNG_VERSION_NAME, |
4450 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4451 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4452 | #else | |
4453 | "", | |
4454 | #endif | |
4455 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4456 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4457 | #else | |
4458 | ""); | |
4459 | #endif | |
1c25284c | 4460 | return ret; |
4e3c1b9b MD |
4461 | } |
4462 | ||
a90917c3 | 4463 | module_init(lttng_events_init); |
11b5a3c2 | 4464 | |
a90917c3 | 4465 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4466 | { |
a40e3229 | 4467 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4468 | |
1e367326 | 4469 | lttng_exit_cpu_hotplug(); |
0c956676 | 4470 | lttng_logger_exit(); |
80996790 | 4471 | lttng_abi_exit(); |
a40e3229 MD |
4472 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4473 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4474 | kmem_cache_destroy(event_recorder_cache); |
4475 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4476 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4477 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4478 | lttng_tracepoint_exit(); |
07dfc1d0 | 4479 | lttng_context_exit(); |
101215b7 | 4480 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4481 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4482 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4483 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4484 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4485 | LTTNG_VERSION_NAME, |
4486 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4487 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4488 | #else | |
4489 | "", | |
4490 | #endif | |
4491 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4492 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4493 | #else | |
4494 | ""); | |
4495 | #endif | |
4e3c1b9b | 4496 | } |
92e94819 | 4497 | |
a90917c3 | 4498 | module_exit(lttng_events_exit); |
11b5a3c2 | 4499 | |
7ca11e77 | 4500 | #include <generated/patches.h> |
101215b7 MJ |
4501 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4502 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4503 | #endif | |
4504 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4505 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4506 | #endif | |
92e94819 MD |
4507 | MODULE_LICENSE("GPL and additional rights"); |
4508 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4509 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4510 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4511 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4512 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4513 | LTTNG_MODULES_EXTRAVERSION); |