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 | |
dd576484 MJ |
52 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0) \ |
53 | || LTTNG_RHEL_KERNEL_RANGE(5,14,0,162,0,0, 5,15,0,0,0,0)) | |
a029f2a3 MJ |
54 | #include <linux/stdarg.h> |
55 | #else | |
56 | #include <stdarg.h> | |
57 | #endif | |
58 | ||
d83004aa JD |
59 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
60 | ||
4e3c1b9b | 61 | static LIST_HEAD(sessions); |
750b05f2 | 62 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 63 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 64 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
65 | /* |
66 | * Protect the sessions and metadata caches. | |
67 | */ | |
4e3c1b9b | 68 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
69 | static struct kmem_cache *event_recorder_cache; |
70 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 71 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 72 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 73 | |
a40e3229 MD |
74 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
75 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b2bc0bc8 | 76 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); |
dffef45d | 77 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 78 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 79 | |
0648898e | 80 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
ac847066 | 81 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
38b35aff MD |
82 | static void _lttng_event_unregister(struct lttng_kernel_event_recorder *event); |
83 | static void _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier); | |
c099397a | 84 | static |
a40e3229 | 85 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 86 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 87 | struct lttng_kernel_event_recorder *event); |
c099397a | 88 | static |
a40e3229 | 89 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
90 | static |
91 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 92 | static |
a40e3229 | 93 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
94 | const struct lttng_kernel_type_common *type, |
95 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
96 | size_t nesting); |
97 | static | |
a40e3229 | 98 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 99 | const struct lttng_kernel_event_field *field, |
f0039724 | 100 | size_t nesting, const char **prev_field_name_p); |
c099397a | 101 | |
c099397a | 102 | void synchronize_trace(void) |
abcca994 | 103 | { |
57acf405 MJ |
104 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
105 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
106 | synchronize_rcu(); |
107 | #else | |
abcca994 | 108 | synchronize_sched(); |
92da05ce MJ |
109 | #endif |
110 | ||
5f4c791e | 111 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
112 | #ifdef CONFIG_PREEMPT_RT_FULL |
113 | synchronize_rcu(); | |
114 | #endif | |
5f4c791e | 115 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
116 | #ifdef CONFIG_PREEMPT_RT |
117 | synchronize_rcu(); | |
118 | #endif | |
5f4c791e | 119 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
120 | } |
121 | ||
3c997079 MD |
122 | void lttng_lock_sessions(void) |
123 | { | |
124 | mutex_lock(&sessions_mutex); | |
125 | } | |
126 | ||
127 | void lttng_unlock_sessions(void) | |
128 | { | |
129 | mutex_unlock(&sessions_mutex); | |
130 | } | |
131 | ||
9fe593d2 FD |
132 | static struct lttng_transport *lttng_transport_find(const char *name) |
133 | { | |
134 | struct lttng_transport *transport; | |
135 | ||
136 | list_for_each_entry(transport, <tng_transport_list, node) { | |
137 | if (!strcmp(transport->name, name)) | |
138 | return transport; | |
139 | } | |
140 | return NULL; | |
141 | } | |
142 | ||
3c997079 MD |
143 | /* |
144 | * Called with sessions lock held. | |
145 | */ | |
146 | int lttng_session_active(void) | |
147 | { | |
a40e3229 | 148 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
149 | |
150 | list_for_each_entry(iter, &sessions, list) { | |
a40e3229 | 151 | if (iter->pub->active) |
3c997079 MD |
152 | return 1; |
153 | } | |
154 | return 0; | |
155 | } | |
156 | ||
a40e3229 | 157 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 158 | { |
a40e3229 MD |
159 | struct lttng_kernel_session *session; |
160 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 161 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 162 | int i; |
4e3c1b9b MD |
163 | |
164 | mutex_lock(&sessions_mutex); | |
a40e3229 | 165 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 166 | if (!session) |
d83004aa | 167 | goto err; |
a40e3229 MD |
168 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
169 | if (!session_priv) | |
170 | goto err_free_session; | |
171 | session->priv = session_priv; | |
172 | session_priv->pub = session; | |
173 | ||
174 | INIT_LIST_HEAD(&session_priv->chan); | |
175 | INIT_LIST_HEAD(&session_priv->events); | |
176 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
177 | |
178 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
179 | GFP_KERNEL); | |
180 | if (!metadata_cache) | |
a40e3229 | 181 | goto err_free_session_private; |
0ca42eb7 | 182 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
183 | if (!metadata_cache->data) |
184 | goto err_free_cache; | |
185 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
186 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 187 | mutex_init(&metadata_cache->lock); |
a40e3229 | 188 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 189 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
a40e3229 | 190 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 191 | sizeof(metadata_cache->uuid)); |
a40e3229 | 192 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 193 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
a40e3229 MD |
194 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
195 | list_add(&session_priv->list, &sessions); | |
196 | ||
a2fa977a MD |
197 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
198 | goto tracker_alloc_error; | |
199 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
200 | goto tracker_alloc_error; | |
201 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
202 | goto tracker_alloc_error; | |
203 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
204 | goto tracker_alloc_error; | |
205 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
206 | goto tracker_alloc_error; | |
207 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
208 | goto tracker_alloc_error; | |
209 | ||
4e3c1b9b | 210 | mutex_unlock(&sessions_mutex); |
a40e3229 | 211 | |
4e3c1b9b | 212 | return session; |
d83004aa | 213 | |
a2fa977a MD |
214 | tracker_alloc_error: |
215 | lttng_id_tracker_fini(&session->pid_tracker); | |
216 | lttng_id_tracker_fini(&session->vpid_tracker); | |
217 | lttng_id_tracker_fini(&session->uid_tracker); | |
218 | lttng_id_tracker_fini(&session->vuid_tracker); | |
219 | lttng_id_tracker_fini(&session->gid_tracker); | |
220 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
221 | err_free_cache: |
222 | kfree(metadata_cache); | |
a40e3229 MD |
223 | err_free_session_private: |
224 | lttng_kvfree(session_priv); | |
d83004aa | 225 | err_free_session: |
48f5e0b5 | 226 | lttng_kvfree(session); |
d83004aa JD |
227 | err: |
228 | mutex_unlock(&sessions_mutex); | |
229 | return NULL; | |
230 | } | |
231 | ||
99f52fcc FD |
232 | static |
233 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
234 | { | |
235 | struct lttng_counter_transport *transport; | |
236 | ||
237 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
238 | if (!strcmp(transport->name, name)) | |
239 | return transport; | |
240 | } | |
241 | return NULL; | |
242 | } | |
243 | ||
244 | struct lttng_counter *lttng_kernel_counter_create( | |
245 | const char *counter_transport_name, | |
246 | size_t number_dimensions, const size_t *dimensions_sizes) | |
247 | { | |
248 | struct lttng_counter *counter = NULL; | |
249 | struct lttng_counter_transport *counter_transport = NULL; | |
250 | ||
251 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
252 | if (!counter_transport) { | |
253 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
254 | counter_transport_name); | |
255 | goto notransport; | |
256 | } | |
257 | if (!try_module_get(counter_transport->owner)) { | |
258 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
259 | goto notransport; | |
260 | } | |
261 | ||
262 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
263 | if (!counter) | |
264 | goto nomem; | |
265 | ||
266 | /* Create event notifier error counter. */ | |
267 | counter->ops = &counter_transport->ops; | |
268 | counter->transport = counter_transport; | |
269 | ||
270 | counter->counter = counter->ops->counter_create( | |
271 | number_dimensions, dimensions_sizes, 0); | |
272 | if (!counter->counter) { | |
273 | goto create_error; | |
274 | } | |
275 | ||
276 | return counter; | |
277 | ||
278 | create_error: | |
279 | lttng_kvfree(counter); | |
280 | nomem: | |
281 | if (counter_transport) | |
282 | module_put(counter_transport->owner); | |
283 | notransport: | |
284 | return NULL; | |
285 | } | |
286 | ||
750b05f2 FD |
287 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
288 | { | |
289 | struct lttng_transport *transport = NULL; | |
290 | struct lttng_event_notifier_group *event_notifier_group; | |
291 | const char *transport_name = "relay-event-notifier"; | |
292 | size_t subbuf_size = 4096; //TODO | |
293 | size_t num_subbuf = 16; //TODO | |
294 | unsigned int switch_timer_interval = 0; | |
295 | unsigned int read_timer_interval = 0; | |
dffef45d | 296 | int i; |
750b05f2 FD |
297 | |
298 | mutex_lock(&sessions_mutex); | |
299 | ||
300 | transport = lttng_transport_find(transport_name); | |
301 | if (!transport) { | |
302 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
303 | transport_name); | |
304 | goto notransport; | |
305 | } | |
306 | if (!try_module_get(transport->owner)) { | |
307 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
308 | transport_name); | |
309 | goto notransport; | |
310 | } | |
311 | ||
312 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
313 | GFP_KERNEL); | |
314 | if (!event_notifier_group) | |
315 | goto nomem; | |
316 | ||
317 | /* | |
318 | * Initialize the ring buffer used to store event notifier | |
319 | * notifications. | |
320 | */ | |
321 | event_notifier_group->ops = &transport->ops; | |
da1fe18f | 322 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
323 | transport_name, event_notifier_group, NULL, |
324 | subbuf_size, num_subbuf, switch_timer_interval, | |
325 | read_timer_interval); | |
326 | if (!event_notifier_group->chan) | |
327 | goto create_error; | |
328 | ||
329 | event_notifier_group->transport = transport; | |
dffef45d FD |
330 | |
331 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
332 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
333 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
334 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
335 | ||
750b05f2 FD |
336 | list_add(&event_notifier_group->node, &event_notifier_groups); |
337 | ||
338 | mutex_unlock(&sessions_mutex); | |
339 | ||
340 | return event_notifier_group; | |
341 | ||
342 | create_error: | |
343 | lttng_kvfree(event_notifier_group); | |
344 | nomem: | |
345 | if (transport) | |
346 | module_put(transport->owner); | |
347 | notransport: | |
348 | mutex_unlock(&sessions_mutex); | |
349 | return NULL; | |
350 | } | |
351 | ||
d83004aa JD |
352 | void metadata_cache_destroy(struct kref *kref) |
353 | { | |
354 | struct lttng_metadata_cache *cache = | |
355 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 356 | vfree(cache->data); |
d83004aa | 357 | kfree(cache); |
4e3c1b9b MD |
358 | } |
359 | ||
a40e3229 | 360 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 361 | { |
ac847066 | 362 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 363 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 364 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 365 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 366 | int ret; |
4e3c1b9b MD |
367 | |
368 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 369 | WRITE_ONCE(session->active, 0); |
ac847066 MD |
370 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
371 | ret = lttng_syscalls_unregister_channel(chan_priv->pub); | |
1ec65de1 MD |
372 | WARN_ON(ret); |
373 | } | |
38b35aff MD |
374 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) |
375 | _lttng_event_unregister(event_recorder_priv->pub); | |
abcca994 | 376 | synchronize_trace(); /* Wait for in-flight events to complete */ |
ac847066 MD |
377 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
378 | ret = lttng_syscalls_destroy_event(chan_priv->pub); | |
badfe9f5 MD |
379 | WARN_ON(ret); |
380 | } | |
b2bc0bc8 | 381 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
a40e3229 | 382 | &session->priv->enablers_head, node) |
b2bc0bc8 | 383 | lttng_event_enabler_destroy(event_enabler); |
a40e3229 | 384 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node) |
0648898e | 385 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
ac847066 MD |
386 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
387 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
388 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 389 | } |
a40e3229 MD |
390 | mutex_lock(&session->priv->metadata_cache->lock); |
391 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 392 | _lttng_metadata_channel_hangup(metadata_stream); |
a40e3229 | 393 | mutex_unlock(&session->priv->metadata_cache->lock); |
a2fa977a MD |
394 | lttng_id_tracker_fini(&session->pid_tracker); |
395 | lttng_id_tracker_fini(&session->vpid_tracker); | |
396 | lttng_id_tracker_fini(&session->uid_tracker); | |
397 | lttng_id_tracker_fini(&session->vuid_tracker); | |
398 | lttng_id_tracker_fini(&session->gid_tracker); | |
399 | lttng_id_tracker_fini(&session->vgid_tracker); | |
a40e3229 MD |
400 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
401 | list_del(&session->priv->list); | |
4e3c1b9b | 402 | mutex_unlock(&sessions_mutex); |
a40e3229 | 403 | lttng_kvfree(session->priv); |
48f5e0b5 | 404 | lttng_kvfree(session); |
4e3c1b9b MD |
405 | } |
406 | ||
dffef45d FD |
407 | void lttng_event_notifier_group_destroy( |
408 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 409 | { |
dffef45d | 410 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
a67ba386 | 411 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
412 | int ret; |
413 | ||
750b05f2 FD |
414 | if (!event_notifier_group) |
415 | return; | |
416 | ||
417 | mutex_lock(&sessions_mutex); | |
dffef45d | 418 | |
3b82c4e1 | 419 | ret = lttng_syscalls_unregister_event_notifier_group(event_notifier_group); |
8a8ac9a8 FD |
420 | WARN_ON(ret); |
421 | ||
a67ba386 | 422 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
38b35aff MD |
423 | &event_notifier_group->event_notifiers_head, node) |
424 | _lttng_event_notifier_unregister(event_notifier_priv->pub); | |
dffef45d | 425 | |
b01155ba FD |
426 | /* Wait for in-flight event notifier to complete */ |
427 | synchronize_trace(); | |
428 | ||
21f58fb7 FD |
429 | irq_work_sync(&event_notifier_group->wakeup_pending); |
430 | ||
8a8ac9a8 FD |
431 | kfree(event_notifier_group->sc_filter); |
432 | ||
dffef45d FD |
433 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
434 | &event_notifier_group->enablers_head, node) | |
435 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
436 | ||
a67ba386 MD |
437 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
438 | &event_notifier_group->event_notifiers_head, node) | |
0648898e | 439 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 440 | |
99f52fcc FD |
441 | if (event_notifier_group->error_counter) { |
442 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 443 | |
99f52fcc FD |
444 | error_counter->ops->counter_destroy(error_counter->counter); |
445 | module_put(error_counter->transport->owner); | |
446 | lttng_kvfree(error_counter); | |
447 | event_notifier_group->error_counter = NULL; | |
448 | } | |
449 | ||
da1fe18f | 450 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
451 | module_put(event_notifier_group->transport->owner); |
452 | list_del(&event_notifier_group->node); | |
dffef45d | 453 | |
750b05f2 FD |
454 | mutex_unlock(&sessions_mutex); |
455 | lttng_kvfree(event_notifier_group); | |
456 | } | |
457 | ||
a40e3229 | 458 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
459 | { |
460 | int ret; | |
461 | ||
462 | mutex_lock(&sessions_mutex); | |
463 | ret = lttng_statedump_start(session); | |
464 | mutex_unlock(&sessions_mutex); | |
465 | return ret; | |
466 | } | |
467 | ||
a40e3229 | 468 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
469 | { |
470 | int ret = 0; | |
ac847066 | 471 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
472 | |
473 | mutex_lock(&sessions_mutex); | |
474 | if (session->active) { | |
475 | ret = -EBUSY; | |
476 | goto end; | |
477 | } | |
c099397a | 478 | |
3c997079 | 479 | /* Set transient enabler state to "enabled" */ |
a40e3229 | 480 | session->priv->tstate = 1; |
3c997079 | 481 | |
4ef81e4a | 482 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 483 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 484 | |
c099397a MD |
485 | /* |
486 | * Snapshot the number of events per channel to know the type of header | |
487 | * we need to use. | |
488 | */ | |
ac847066 MD |
489 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
490 | if (chan_priv->header_type) | |
491 | continue; /* don't change it if session stop/restart */ | |
492 | if (chan_priv->free_event_id < 31) | |
493 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 494 | else |
ac847066 | 495 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
496 | } |
497 | ||
64af2437 | 498 | /* Clear each stream's quiescent state. */ |
ac847066 MD |
499 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
500 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
501 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 502 | } |
64af2437 | 503 | |
a8f2d0c7 | 504 | WRITE_ONCE(session->active, 1); |
a40e3229 | 505 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 506 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 507 | if (ret) { |
a8f2d0c7 | 508 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
509 | goto end; |
510 | } | |
511 | ret = lttng_statedump_start(session); | |
360f38ea | 512 | if (ret) |
a8f2d0c7 | 513 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
514 | end: |
515 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 516 | return ret; |
c0e31d2e MD |
517 | } |
518 | ||
a40e3229 | 519 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
520 | { |
521 | int ret = 0; | |
ac847066 | 522 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
523 | |
524 | mutex_lock(&sessions_mutex); | |
525 | if (!session->active) { | |
526 | ret = -EBUSY; | |
527 | goto end; | |
528 | } | |
a8f2d0c7 | 529 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
530 | |
531 | /* Set transient enabler state to "disabled" */ | |
a40e3229 | 532 | session->priv->tstate = 0; |
b2bc0bc8 | 533 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
534 | |
535 | /* Set each stream's quiescent state. */ | |
ac847066 MD |
536 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
537 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
538 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 539 | } |
c0e31d2e MD |
540 | end: |
541 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 542 | return ret; |
c0e31d2e MD |
543 | } |
544 | ||
a40e3229 | 545 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
546 | { |
547 | int ret = 0; | |
ac847066 | 548 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 549 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
a40e3229 | 550 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
551 | struct lttng_metadata_stream *stream; |
552 | ||
553 | mutex_lock(&sessions_mutex); | |
554 | if (!session->active) { | |
555 | ret = -EBUSY; | |
556 | goto end; | |
557 | } | |
558 | ||
559 | mutex_lock(&cache->lock); | |
560 | memset(cache->data, 0, cache->cache_alloc); | |
561 | cache->metadata_written = 0; | |
562 | cache->version++; | |
a40e3229 | 563 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
564 | stream->metadata_out = 0; |
565 | stream->metadata_in = 0; | |
566 | } | |
567 | mutex_unlock(&cache->lock); | |
568 | ||
a40e3229 | 569 | session->priv->metadata_dumped = 0; |
ac847066 MD |
570 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
571 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
572 | } |
573 | ||
a40e3229 | 574 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 575 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
576 | } |
577 | ||
578 | ret = _lttng_session_metadata_statedump(session); | |
579 | ||
580 | end: | |
581 | mutex_unlock(&sessions_mutex); | |
582 | return ret; | |
583 | } | |
584 | ||
ac847066 | 585 | int lttng_channel_enable(struct lttng_kernel_channel_buffer *channel) |
e64957da | 586 | { |
3c997079 | 587 | int ret = 0; |
e64957da | 588 | |
3c997079 | 589 | mutex_lock(&sessions_mutex); |
ac847066 | 590 | if (channel->priv->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
591 | ret = -EPERM; |
592 | goto end; | |
593 | } | |
ac847066 | 594 | if (channel->parent.enabled) { |
3c997079 MD |
595 | ret = -EEXIST; |
596 | goto end; | |
597 | } | |
598 | /* Set transient enabler state to "enabled" */ | |
ac847066 MD |
599 | channel->priv->parent.tstate = 1; |
600 | lttng_session_sync_event_enablers(channel->parent.session); | |
3c997079 | 601 | /* Set atomically the state to "enabled" */ |
ac847066 | 602 | WRITE_ONCE(channel->parent.enabled, 1); |
3c997079 MD |
603 | end: |
604 | mutex_unlock(&sessions_mutex); | |
605 | return ret; | |
e64957da MD |
606 | } |
607 | ||
ac847066 | 608 | int lttng_channel_disable(struct lttng_kernel_channel_buffer *channel) |
e64957da | 609 | { |
3c997079 | 610 | int ret = 0; |
e64957da | 611 | |
3c997079 | 612 | mutex_lock(&sessions_mutex); |
ac847066 | 613 | if (channel->priv->channel_type == METADATA_CHANNEL) { |
3c997079 MD |
614 | ret = -EPERM; |
615 | goto end; | |
616 | } | |
ac847066 | 617 | if (!channel->parent.enabled) { |
3c997079 MD |
618 | ret = -EEXIST; |
619 | goto end; | |
620 | } | |
621 | /* Set atomically the state to "disabled" */ | |
ac847066 | 622 | WRITE_ONCE(channel->parent.enabled, 0); |
3c997079 | 623 | /* Set transient enabler state to "enabled" */ |
ac847066 MD |
624 | channel->priv->parent.tstate = 0; |
625 | lttng_session_sync_event_enablers(channel->parent.session); | |
3c997079 MD |
626 | end: |
627 | mutex_unlock(&sessions_mutex); | |
628 | return ret; | |
e64957da MD |
629 | } |
630 | ||
9d993668 | 631 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 632 | { |
3c997079 | 633 | int ret = 0; |
e64957da | 634 | |
3c997079 | 635 | mutex_lock(&sessions_mutex); |
9d993668 MD |
636 | switch (event->type) { |
637 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
638 | { | |
639 | struct lttng_kernel_event_recorder *event_recorder = | |
640 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
641 | ||
ac847066 | 642 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
643 | ret = -EPERM; |
644 | goto end; | |
645 | } | |
a0493bef | 646 | break; |
9d993668 MD |
647 | } |
648 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
649 | switch (event->priv->instrumentation) { | |
650 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
651 | ret = -EINVAL; | |
652 | goto end; | |
653 | default: | |
654 | break; | |
655 | } | |
a0493bef MD |
656 | break; |
657 | default: | |
9d993668 | 658 | break; |
a0493bef | 659 | } |
e64957da | 660 | |
9d993668 | 661 | if (event->enabled) { |
3c997079 MD |
662 | ret = -EEXIST; |
663 | goto end; | |
664 | } | |
a67ba386 | 665 | switch (event->priv->instrumentation) { |
c570be0d MJ |
666 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
667 | lttng_fallthrough; | |
606828e4 | 668 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
669 | ret = -EINVAL; |
670 | break; | |
b4a75708 | 671 | |
c570be0d MJ |
672 | case LTTNG_KERNEL_ABI_KPROBE: |
673 | lttng_fallthrough; | |
606828e4 | 674 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 675 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 676 | break; |
b4a75708 | 677 | |
606828e4 | 678 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 679 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 680 | break; |
b4a75708 | 681 | |
c570be0d MJ |
682 | case LTTNG_KERNEL_ABI_FUNCTION: |
683 | lttng_fallthrough; | |
684 | case LTTNG_KERNEL_ABI_NOOP: | |
685 | lttng_fallthrough; | |
a0493bef MD |
686 | default: |
687 | WARN_ON_ONCE(1); | |
688 | ret = -EINVAL; | |
689 | } | |
3c997079 MD |
690 | end: |
691 | mutex_unlock(&sessions_mutex); | |
692 | return ret; | |
e64957da MD |
693 | } |
694 | ||
9d993668 | 695 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
696 | { |
697 | int ret = 0; | |
698 | ||
699 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
700 | switch (event->type) { |
701 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
702 | { | |
703 | struct lttng_kernel_event_recorder *event_recorder = | |
704 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
705 | ||
ac847066 | 706 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
707 | ret = -EPERM; |
708 | goto end; | |
709 | } | |
b01155ba | 710 | break; |
9d993668 MD |
711 | } |
712 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
713 | switch (event->priv->instrumentation) { | |
714 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
715 | ret = -EINVAL; | |
716 | goto end; | |
717 | default: | |
718 | break; | |
719 | } | |
2b16f0c9 | 720 | break; |
dffef45d | 721 | default: |
9d993668 | 722 | break; |
dffef45d | 723 | } |
dffef45d | 724 | |
a67ba386 | 725 | if (!event->enabled) { |
dffef45d FD |
726 | ret = -EEXIST; |
727 | goto end; | |
728 | } | |
a67ba386 | 729 | switch (event->priv->instrumentation) { |
c570be0d MJ |
730 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
731 | lttng_fallthrough; | |
606828e4 | 732 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
733 | ret = -EINVAL; |
734 | break; | |
b4a75708 | 735 | |
c570be0d MJ |
736 | case LTTNG_KERNEL_ABI_KPROBE: |
737 | lttng_fallthrough; | |
606828e4 | 738 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 739 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 740 | break; |
b4a75708 | 741 | |
9d993668 MD |
742 | case LTTNG_KERNEL_ABI_KRETPROBE: |
743 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
744 | break; | |
745 | ||
c570be0d MJ |
746 | case LTTNG_KERNEL_ABI_FUNCTION: |
747 | lttng_fallthrough; | |
748 | case LTTNG_KERNEL_ABI_NOOP: | |
749 | lttng_fallthrough; | |
dffef45d FD |
750 | default: |
751 | WARN_ON_ONCE(1); | |
752 | ret = -EINVAL; | |
753 | } | |
754 | end: | |
755 | mutex_unlock(&sessions_mutex); | |
756 | return ret; | |
757 | } | |
758 | ||
ac847066 | 759 | struct lttng_kernel_channel_buffer *lttng_channel_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
760 | const char *transport_name, |
761 | void *buf_addr, | |
4e3c1b9b MD |
762 | size_t subbuf_size, size_t num_subbuf, |
763 | unsigned int switch_timer_interval, | |
d83004aa JD |
764 | unsigned int read_timer_interval, |
765 | enum channel_type channel_type) | |
4e3c1b9b | 766 | { |
ac847066 MD |
767 | struct lttng_kernel_channel_buffer *chan; |
768 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 769 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
770 | |
771 | mutex_lock(&sessions_mutex); | |
a40e3229 | 772 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 773 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 774 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 775 | if (!transport) { |
5a15f70c | 776 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 777 | transport_name); |
c0e31d2e | 778 | goto notransport; |
f3d01b96 | 779 | } |
a33c9927 | 780 | if (!try_module_get(transport->owner)) { |
5a15f70c | 781 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
782 | goto notransport; |
783 | } | |
ac847066 | 784 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 785 | if (!chan) |
c0e31d2e | 786 | goto nomem; |
ac847066 MD |
787 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
788 | if (!chan_priv) | |
789 | goto nomem_priv; | |
790 | chan->priv = chan_priv; | |
791 | chan_priv->pub = chan; | |
792 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
793 | chan->parent.session = session; | |
794 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 795 | chan->ops = &transport->ops; |
125b4df4 MD |
796 | /* |
797 | * Note: the channel creation op already writes into the packet | |
798 | * headers. Therefore the "chan" information used as input | |
799 | * should be already accessible. | |
800 | */ | |
ac847066 | 801 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
802 | chan, buf_addr, subbuf_size, num_subbuf, |
803 | switch_timer_interval, read_timer_interval); | |
ac847066 | 804 | if (!chan->priv->rb_chan) |
f3d01b96 | 805 | goto create_error; |
ac847066 MD |
806 | chan->priv->parent.tstate = 1; |
807 | chan->parent.enabled = 1; | |
808 | chan->priv->transport = transport; | |
809 | chan->priv->channel_type = channel_type; | |
810 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
811 | mutex_unlock(&sessions_mutex); |
812 | return chan; | |
813 | ||
f3d01b96 | 814 | create_error: |
ac847066 MD |
815 | kfree(chan_priv); |
816 | nomem_priv: | |
f3d01b96 | 817 | kfree(chan); |
c0e31d2e | 818 | nomem: |
a33c9927 MD |
819 | if (transport) |
820 | module_put(transport->owner); | |
c0e31d2e | 821 | notransport: |
e5382b6d | 822 | active: |
4e3c1b9b MD |
823 | mutex_unlock(&sessions_mutex); |
824 | return NULL; | |
825 | } | |
826 | ||
827 | /* | |
d83004aa JD |
828 | * Only used internally at session destruction for per-cpu channels, and |
829 | * when metadata channel is released. | |
830 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 831 | */ |
aa7c23a9 | 832 | static |
ac847066 | 833 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 834 | { |
ac847066 MD |
835 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
836 | module_put(chan->priv->transport->owner); | |
837 | list_del(&chan->priv->node); | |
838 | lttng_kernel_destroy_context(chan->priv->ctx); | |
839 | kfree(chan->priv); | |
4e3c1b9b MD |
840 | kfree(chan); |
841 | } | |
842 | ||
ac847066 | 843 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 844 | { |
ac847066 | 845 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
846 | |
847 | /* Protect the metadata cache with the sessions_mutex. */ | |
848 | mutex_lock(&sessions_mutex); | |
849 | _lttng_channel_destroy(chan); | |
850 | mutex_unlock(&sessions_mutex); | |
851 | } | |
852 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
853 | ||
854 | static | |
855 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
856 | { | |
857 | stream->finalized = 1; | |
858 | wake_up_interruptible(&stream->read_wait); | |
859 | } | |
860 | ||
a101fa10 | 861 | |
e5382b6d MD |
862 | /* |
863 | * Supports event creation while tracing session is active. | |
3c997079 | 864 | * Needs to be called with sessions mutex held. |
e5382b6d | 865 | */ |
ac847066 | 866 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan, |
606828e4 | 867 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 868 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 869 | enum lttng_kernel_abi_instrumentation itype) |
4e3c1b9b | 870 | { |
ac847066 | 871 | struct lttng_kernel_session *session = chan->parent.session; |
a67ba386 MD |
872 | struct lttng_kernel_event_recorder *event_recorder; |
873 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
874 | const char *event_name; |
875 | struct hlist_head *head; | |
3d084699 | 876 | int ret; |
4e3c1b9b | 877 | |
ac847066 | 878 | if (chan->priv->free_event_id == -1U) { |
4cf0bf51 | 879 | ret = -EMFILE; |
e5382b6d | 880 | goto full; |
abc0446a | 881 | } |
3c997079 MD |
882 | |
883 | switch (itype) { | |
606828e4 | 884 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 885 | event_name = event_desc->event_name; |
3c997079 | 886 | break; |
b4a75708 | 887 | |
c570be0d MJ |
888 | case LTTNG_KERNEL_ABI_KPROBE: |
889 | lttng_fallthrough; | |
890 | case LTTNG_KERNEL_ABI_UPROBE: | |
891 | lttng_fallthrough; | |
892 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
893 | lttng_fallthrough; | |
606828e4 | 894 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
895 | event_name = event_param->name; |
896 | break; | |
b4a75708 | 897 | |
c570be0d MJ |
898 | case LTTNG_KERNEL_ABI_FUNCTION: |
899 | lttng_fallthrough; | |
900 | case LTTNG_KERNEL_ABI_NOOP: | |
901 | lttng_fallthrough; | |
3c997079 MD |
902 | default: |
903 | WARN_ON_ONCE(1); | |
904 | ret = -EINVAL; | |
905 | goto type_error; | |
906 | } | |
4a11ef1c | 907 | |
a40e3229 | 908 | head = utils_borrow_hash_table_bucket(session->priv->events_ht.table, |
4a11ef1c | 909 | LTTNG_EVENT_HT_SIZE, event_name); |
a67ba386 MD |
910 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
911 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
912 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 913 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 914 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
915 | ret = -EEXIST; |
916 | goto exist; | |
abc0446a MD |
917 | } |
918 | } | |
3c997079 | 919 | |
a67ba386 MD |
920 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
921 | if (!event_recorder) { | |
4cf0bf51 | 922 | ret = -ENOMEM; |
4e3c1b9b | 923 | goto cache_error; |
abc0446a | 924 | } |
a67ba386 MD |
925 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
926 | if (!event_recorder_priv) { | |
927 | ret = -ENOMEM; | |
928 | goto cache_private_error; | |
929 | } | |
930 | event_recorder_priv->pub = event_recorder; | |
931 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
932 | event_recorder->priv = event_recorder_priv; | |
933 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
934 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
935 | ||
8a445457 | 936 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 937 | event_recorder->chan = chan; |
ac847066 | 938 | event_recorder->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
939 | event_recorder->priv->parent.instrumentation = itype; |
940 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
941 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
942 | |
943 | switch (itype) { | |
606828e4 | 944 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 945 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
946 | event_recorder->parent.enabled = 0; |
947 | event_recorder->priv->parent.registered = 0; | |
948 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
949 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 950 | ret = -ENOENT; |
d3dbe23c | 951 | goto register_error; |
abc0446a | 952 | } |
3c997079 MD |
953 | /* Populate lttng_event structure before event registration. */ |
954 | smp_wmb(); | |
baf20995 | 955 | break; |
b4a75708 | 956 | |
606828e4 | 957 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
958 | /* |
959 | * Needs to be explicitly enabled after creation, since | |
960 | * we may want to apply filters. | |
961 | */ | |
a67ba386 MD |
962 | event_recorder->parent.enabled = 0; |
963 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
964 | /* |
965 | * Populate lttng_event structure before event | |
966 | * registration. | |
967 | */ | |
968 | smp_wmb(); | |
8bf17deb | 969 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
970 | event_param->u.kprobe.symbol_name, |
971 | event_param->u.kprobe.offset, | |
972 | event_param->u.kprobe.addr, | |
a67ba386 | 973 | event_recorder); |
abc0446a | 974 | if (ret) { |
4cf0bf51 | 975 | ret = -EINVAL; |
d6d808f3 | 976 | goto register_error; |
abc0446a | 977 | } |
a67ba386 | 978 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 979 | WARN_ON_ONCE(!ret); |
d6d808f3 | 980 | break; |
b4a75708 | 981 | |
606828e4 | 982 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 983 | { |
a67ba386 MD |
984 | struct lttng_kernel_event_recorder *event_recorder_return; |
985 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
986 | |
987 | /* kretprobe defines 2 events */ | |
a0493bef MD |
988 | /* |
989 | * Needs to be explicitly enabled after creation, since | |
990 | * we may want to apply filters. | |
991 | */ | |
a67ba386 MD |
992 | event_recorder->parent.enabled = 0; |
993 | event_recorder->priv->parent.registered = 1; | |
994 | ||
995 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
996 | if (!event_recorder_return) { | |
997 | ret = -ENOMEM; | |
998 | goto register_error; | |
999 | } | |
1000 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
1001 | if (!event_recorder_return_priv) { | |
1002 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1003 | ret = -ENOMEM; |
7371f44c | 1004 | goto register_error; |
abc0446a | 1005 | } |
a67ba386 MD |
1006 | event_recorder_return_priv->pub = event_recorder_return; |
1007 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
1008 | event_recorder_return->priv = event_recorder_return_priv; | |
1009 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
1010 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
1011 | ||
8a445457 | 1012 | event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 1013 | event_recorder_return->chan = chan; |
ac847066 | 1014 | event_recorder_return->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
1015 | event_recorder_return->priv->parent.instrumentation = itype; |
1016 | event_recorder_return->parent.enabled = 0; | |
1017 | event_recorder_return->priv->parent.registered = 1; | |
1018 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
1019 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 1020 | /* |
a90917c3 | 1021 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1022 | */ |
1023 | smp_wmb(); | |
3c997079 | 1024 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1025 | event_param->u.kretprobe.symbol_name, |
1026 | event_param->u.kretprobe.offset, | |
1027 | event_param->u.kretprobe.addr, | |
a67ba386 | 1028 | event_recorder, event_recorder_return); |
7371f44c | 1029 | if (ret) { |
a67ba386 MD |
1030 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1031 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1032 | ret = -EINVAL; |
7371f44c MD |
1033 | goto register_error; |
1034 | } | |
1035 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1036 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1037 | WARN_ON_ONCE(!ret); |
a67ba386 | 1038 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1039 | WARN_ON_ONCE(!ret); |
ac847066 | 1040 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, |
a67ba386 | 1041 | event_recorder_return); |
abc0446a | 1042 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1043 | if (ret) { |
a67ba386 MD |
1044 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1045 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
1046 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1047 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1048 | goto statedump_error; |
1049 | } | |
ac847066 | 1050 | list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events); |
7371f44c MD |
1051 | break; |
1052 | } | |
b4a75708 | 1053 | |
606828e4 | 1054 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1055 | /* |
1056 | * Needs to be explicitly enabled after creation, since | |
1057 | * we may want to apply filters. | |
1058 | */ | |
a67ba386 MD |
1059 | event_recorder->parent.enabled = 0; |
1060 | event_recorder->priv->parent.registered = 0; | |
1061 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1062 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1063 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1064 | ret = -EINVAL; |
1065 | goto register_error; | |
606828e4 | 1066 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1067 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1068 | break; |
606828e4 | 1069 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1070 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1071 | break; |
1072 | } | |
1073 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1074 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1075 | ret = -EINVAL; |
1076 | goto register_error; | |
606828e4 | 1077 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1078 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1079 | break; |
606828e4 | 1080 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1081 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1082 | break; |
1083 | } | |
a67ba386 | 1084 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1085 | ret = -EINVAL; |
259b6cb3 | 1086 | goto register_error; |
abc0446a | 1087 | } |
1ec65de1 | 1088 | break; |
b4a75708 | 1089 | |
606828e4 | 1090 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1091 | /* |
1092 | * Needs to be explicitly enabled after creation, since | |
1093 | * we may want to apply filters. | |
1094 | */ | |
a67ba386 MD |
1095 | event_recorder->parent.enabled = 0; |
1096 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1097 | |
a344f64b FD |
1098 | /* |
1099 | * Populate lttng_event structure before event | |
1100 | * registration. | |
1101 | */ | |
1102 | smp_wmb(); | |
149b9a9d | 1103 | |
83b802dc | 1104 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1105 | event_param->u.uprobe.fd, |
a67ba386 | 1106 | event_recorder); |
149b9a9d YB |
1107 | if (ret) |
1108 | goto register_error; | |
a67ba386 | 1109 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1110 | WARN_ON_ONCE(!ret); |
1111 | break; | |
b4a75708 | 1112 | |
c570be0d MJ |
1113 | case LTTNG_KERNEL_ABI_FUNCTION: |
1114 | lttng_fallthrough; | |
1115 | case LTTNG_KERNEL_ABI_NOOP: | |
1116 | lttng_fallthrough; | |
baf20995 MD |
1117 | default: |
1118 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1119 | ret = -EINVAL; |
df07930b | 1120 | goto register_error; |
baf20995 | 1121 | } |
ac847066 | 1122 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder); |
abc0446a MD |
1123 | WARN_ON_ONCE(ret > 0); |
1124 | if (ret) { | |
c099397a | 1125 | goto statedump_error; |
abc0446a | 1126 | } |
a67ba386 | 1127 | hlist_add_head(&event_recorder->priv->hlist, head); |
ac847066 | 1128 | list_add(&event_recorder->priv->node, &chan->parent.session->priv->events); |
a67ba386 | 1129 | return event_recorder; |
4e3c1b9b | 1130 | |
c099397a | 1131 | statedump_error: |
259b6cb3 | 1132 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1133 | register_error: |
a67ba386 MD |
1134 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1135 | cache_private_error: | |
1136 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1137 | cache_error: |
1138 | exist: | |
3c997079 | 1139 | type_error: |
e5382b6d | 1140 | full: |
4cf0bf51 | 1141 | return ERR_PTR(ret); |
4e3c1b9b MD |
1142 | } |
1143 | ||
a67ba386 | 1144 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1145 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1146 | uint64_t token, uint64_t error_counter_index, |
1147 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1148 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1149 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1150 | { |
a67ba386 MD |
1151 | struct lttng_kernel_event_notifier *event_notifier; |
1152 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1153 | struct lttng_counter *error_counter; |
dffef45d FD |
1154 | const char *event_name; |
1155 | struct hlist_head *head; | |
1156 | int ret; | |
1157 | ||
1158 | switch (itype) { | |
606828e4 | 1159 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1160 | event_name = event_desc->event_name; |
b01155ba | 1161 | break; |
b4a75708 | 1162 | |
c570be0d MJ |
1163 | case LTTNG_KERNEL_ABI_KPROBE: |
1164 | lttng_fallthrough; | |
1165 | case LTTNG_KERNEL_ABI_UPROBE: | |
1166 | lttng_fallthrough; | |
606828e4 | 1167 | case LTTNG_KERNEL_ABI_SYSCALL: |
2b16f0c9 FD |
1168 | event_name = event_notifier_param->event.name; |
1169 | break; | |
b4a75708 | 1170 | |
c570be0d MJ |
1171 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1172 | lttng_fallthrough; | |
1173 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1174 | lttng_fallthrough; | |
1175 | case LTTNG_KERNEL_ABI_NOOP: | |
1176 | lttng_fallthrough; | |
dffef45d FD |
1177 | default: |
1178 | WARN_ON_ONCE(1); | |
1179 | ret = -EINVAL; | |
1180 | goto type_error; | |
1181 | } | |
1182 | ||
1183 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1184 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
a67ba386 MD |
1185 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1186 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1187 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1188 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1189 | && event_notifier_group == event_notifier_priv->group |
1190 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1191 | ret = -EEXIST; |
1192 | goto exist; | |
1193 | } | |
1194 | } | |
1195 | ||
1196 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1197 | if (!event_notifier) { | |
1198 | ret = -ENOMEM; | |
1199 | goto cache_error; | |
1200 | } | |
a67ba386 MD |
1201 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1202 | if (!event_notifier_priv) { | |
1203 | ret = -ENOMEM; | |
1204 | goto cache_private_error; | |
1205 | } | |
1206 | event_notifier_priv->pub = event_notifier; | |
1207 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1208 | event_notifier->priv = event_notifier_priv; | |
1209 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1210 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1211 | ||
1212 | event_notifier->priv->group = event_notifier_group; | |
1213 | event_notifier->priv->parent.user_token = token; | |
1214 | event_notifier->priv->error_counter_index = error_counter_index; | |
1215 | event_notifier->priv->num_captures = 0; | |
1216 | event_notifier->priv->parent.instrumentation = itype; | |
1217 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1218 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1219 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1220 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
8a445457 | 1221 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; |
dffef45d FD |
1222 | |
1223 | switch (itype) { | |
606828e4 | 1224 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1225 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1226 | event_notifier->parent.enabled = 0; |
1227 | event_notifier->priv->parent.registered = 0; | |
1228 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1229 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1230 | ret = -ENOENT; |
1231 | goto register_error; | |
1232 | } | |
1233 | /* Populate lttng_event_notifier structure before event registration. */ | |
1234 | smp_wmb(); | |
1235 | break; | |
b4a75708 | 1236 | |
606828e4 | 1237 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1238 | /* |
1239 | * Needs to be explicitly enabled after creation, since | |
1240 | * we may want to apply filters. | |
1241 | */ | |
a67ba386 MD |
1242 | event_notifier->parent.enabled = 0; |
1243 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1244 | /* |
1245 | * Populate lttng_event_notifier structure before event | |
1246 | * registration. | |
1247 | */ | |
1248 | smp_wmb(); | |
1249 | ret = lttng_kprobes_register_event_notifier( | |
1250 | event_notifier_param->event.u.kprobe.symbol_name, | |
1251 | event_notifier_param->event.u.kprobe.offset, | |
1252 | event_notifier_param->event.u.kprobe.addr, | |
1253 | event_notifier); | |
1254 | if (ret) { | |
1255 | ret = -EINVAL; | |
1256 | goto register_error; | |
1257 | } | |
a67ba386 | 1258 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1259 | WARN_ON_ONCE(!ret); |
1260 | break; | |
b4a75708 | 1261 | |
606828e4 | 1262 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1263 | /* |
1264 | * Needs to be explicitly enabled after creation, since | |
1265 | * we may want to apply filters. | |
1266 | */ | |
a67ba386 MD |
1267 | event_notifier->parent.enabled = 0; |
1268 | event_notifier->priv->parent.registered = 0; | |
1269 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1270 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1271 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1272 | ret = -EINVAL; |
1273 | goto register_error; | |
606828e4 | 1274 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1275 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1276 | break; |
606828e4 | 1277 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1278 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1279 | break; |
1280 | } | |
1281 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1282 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1283 | ret = -EINVAL; |
1284 | goto register_error; | |
606828e4 | 1285 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1286 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1287 | break; |
606828e4 | 1288 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1289 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1290 | break; |
1291 | } | |
1292 | ||
a67ba386 | 1293 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1294 | ret = -EINVAL; |
1295 | goto register_error; | |
1296 | } | |
1297 | break; | |
b4a75708 | 1298 | |
606828e4 | 1299 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1300 | /* |
1301 | * Needs to be explicitly enabled after creation, since | |
1302 | * we may want to apply filters. | |
1303 | */ | |
a67ba386 MD |
1304 | event_notifier->parent.enabled = 0; |
1305 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1306 | |
1307 | /* | |
1308 | * Populate lttng_event_notifier structure before | |
1309 | * event_notifier registration. | |
1310 | */ | |
1311 | smp_wmb(); | |
1312 | ||
1313 | ret = lttng_uprobes_register_event_notifier( | |
1314 | event_notifier_param->event.name, | |
1315 | event_notifier_param->event.u.uprobe.fd, | |
1316 | event_notifier); | |
1317 | if (ret) | |
1318 | goto register_error; | |
a67ba386 | 1319 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1320 | WARN_ON_ONCE(!ret); |
1321 | break; | |
b4a75708 | 1322 | |
c570be0d MJ |
1323 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1324 | lttng_fallthrough; | |
1325 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1326 | lttng_fallthrough; | |
1327 | case LTTNG_KERNEL_ABI_NOOP: | |
1328 | lttng_fallthrough; | |
dffef45d FD |
1329 | default: |
1330 | WARN_ON_ONCE(1); | |
1331 | ret = -EINVAL; | |
1332 | goto register_error; | |
1333 | } | |
1334 | ||
a67ba386 MD |
1335 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1336 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1337 | |
1338 | /* | |
1339 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1340 | * bucket is currently in use. We trust it. The session lock |
1341 | * synchronizes against concurrent creation of the error | |
1342 | * counter. | |
99f52fcc | 1343 | */ |
ab04d7b1 MD |
1344 | error_counter = event_notifier_group->error_counter; |
1345 | if (error_counter) { | |
99f52fcc FD |
1346 | size_t dimension_index[1]; |
1347 | ||
1348 | /* | |
1349 | * Check that the index is within the boundary of the counter. | |
1350 | */ | |
a67ba386 | 1351 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1352 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1353 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1354 | ret = -EINVAL; |
1355 | goto register_error; | |
1356 | } | |
1357 | ||
a67ba386 | 1358 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1359 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1360 | if (ret) { |
1361 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1362 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1363 | goto register_error; |
1364 | } | |
1365 | } | |
1366 | ||
dffef45d FD |
1367 | return event_notifier; |
1368 | ||
1369 | register_error: | |
a67ba386 MD |
1370 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1371 | cache_private_error: | |
dffef45d FD |
1372 | kmem_cache_free(event_notifier_cache, event_notifier); |
1373 | cache_error: | |
1374 | exist: | |
1375 | type_error: | |
1376 | return ERR_PTR(ret); | |
1377 | } | |
1378 | ||
99f52fcc FD |
1379 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1380 | const size_t *dim_indexes, int32_t cpu, | |
1381 | int64_t *val, bool *overflow, bool *underflow) | |
1382 | { | |
1383 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1384 | cpu, val, overflow, underflow); | |
1385 | } | |
1386 | ||
1387 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1388 | const size_t *dim_indexes, int64_t *val, | |
1389 | bool *overflow, bool *underflow) | |
1390 | { | |
1391 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1392 | val, overflow, underflow); | |
1393 | } | |
1394 | ||
1395 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1396 | const size_t *dim_indexes) | |
1397 | { | |
1398 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1399 | } | |
1400 | ||
ac847066 | 1401 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_kernel_channel_buffer *chan, |
606828e4 | 1402 | struct lttng_kernel_abi_event *event_param, |
437d5aa5 | 1403 | const struct lttng_kernel_event_desc *event_desc, |
606828e4 | 1404 | enum lttng_kernel_abi_instrumentation itype) |
3c997079 | 1405 | { |
a67ba386 | 1406 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1407 | |
1408 | mutex_lock(&sessions_mutex); | |
a67ba386 | 1409 | event = _lttng_kernel_event_recorder_create(chan, event_param, event_desc, itype); |
3c997079 MD |
1410 | mutex_unlock(&sessions_mutex); |
1411 | return event; | |
1412 | } | |
1413 | ||
a67ba386 | 1414 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1415 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1416 | uint64_t id, uint64_t error_counter_index, |
1417 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1418 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1419 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1420 | { |
a67ba386 | 1421 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1422 | |
1423 | mutex_lock(&sessions_mutex); | |
1424 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1425 | error_counter_index, event_notifier_group, |
a67ba386 | 1426 | event_notifier_param, itype); |
dffef45d FD |
1427 | mutex_unlock(&sessions_mutex); |
1428 | return event_notifier; | |
1429 | } | |
1430 | ||
3c997079 MD |
1431 | /* Only used for tracepoints for now. */ |
1432 | static | |
a67ba386 | 1433 | void register_event(struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 1434 | { |
437d5aa5 | 1435 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1436 | int ret = -EINVAL; |
3c997079 | 1437 | |
38b35aff | 1438 | WARN_ON_ONCE(event_recorder->priv->parent.registered); |
4ecb5ad5 | 1439 | |
a67ba386 MD |
1440 | desc = event_recorder->priv->parent.desc; |
1441 | switch (event_recorder->priv->parent.instrumentation) { | |
606828e4 | 1442 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1443 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
e69abdfd | 1444 | desc->tp_class->probe_callback, |
a67ba386 | 1445 | event_recorder); |
4ecb5ad5 | 1446 | break; |
b4a75708 | 1447 | |
606828e4 | 1448 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1449 | ret = lttng_syscall_filter_enable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1450 | break; |
b4a75708 | 1451 | |
c570be0d MJ |
1452 | case LTTNG_KERNEL_ABI_KPROBE: |
1453 | lttng_fallthrough; | |
1454 | case LTTNG_KERNEL_ABI_UPROBE: | |
1455 | lttng_fallthrough; | |
606828e4 | 1456 | case LTTNG_KERNEL_ABI_KRETPROBE: |
4ecb5ad5 MD |
1457 | ret = 0; |
1458 | break; | |
b4a75708 | 1459 | |
c570be0d MJ |
1460 | case LTTNG_KERNEL_ABI_FUNCTION: |
1461 | lttng_fallthrough; | |
1462 | case LTTNG_KERNEL_ABI_NOOP: | |
1463 | lttng_fallthrough; | |
4ecb5ad5 MD |
1464 | default: |
1465 | WARN_ON_ONCE(1); | |
1466 | } | |
3c997079 | 1467 | if (!ret) |
a67ba386 | 1468 | event_recorder->priv->parent.registered = 1; |
3c997079 MD |
1469 | } |
1470 | ||
4e3c1b9b MD |
1471 | /* |
1472 | * Only used internally at session destruction. | |
1473 | */ | |
38b35aff MD |
1474 | static |
1475 | void unregister_event(struct lttng_kernel_event_recorder *event_recorder) | |
4e3c1b9b | 1476 | { |
a67ba386 | 1477 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
437d5aa5 | 1478 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1479 | int ret = -EINVAL; |
1480 | ||
38b35aff | 1481 | WARN_ON_ONCE(!event_priv->registered); |
3c997079 | 1482 | |
a67ba386 MD |
1483 | desc = event_priv->desc; |
1484 | switch (event_priv->instrumentation) { | |
606828e4 | 1485 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1486 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
e69abdfd | 1487 | event_priv->desc->tp_class->probe_callback, |
a67ba386 | 1488 | event_recorder); |
baf20995 | 1489 | break; |
b4a75708 | 1490 | |
606828e4 | 1491 | case LTTNG_KERNEL_ABI_KPROBE: |
a67ba386 | 1492 | lttng_kprobes_unregister_event(event_recorder); |
d6d808f3 MD |
1493 | ret = 0; |
1494 | break; | |
b4a75708 | 1495 | |
606828e4 | 1496 | case LTTNG_KERNEL_ABI_KRETPROBE: |
a67ba386 | 1497 | lttng_kretprobes_unregister(event_recorder); |
7371f44c MD |
1498 | ret = 0; |
1499 | break; | |
b4a75708 | 1500 | |
606828e4 | 1501 | case LTTNG_KERNEL_ABI_SYSCALL: |
a67ba386 | 1502 | ret = lttng_syscall_filter_disable_event(event_recorder->chan, event_recorder); |
4ecb5ad5 | 1503 | break; |
b4a75708 | 1504 | |
606828e4 | 1505 | case LTTNG_KERNEL_ABI_NOOP: |
259b6cb3 MD |
1506 | ret = 0; |
1507 | break; | |
b4a75708 | 1508 | |
606828e4 | 1509 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 1510 | lttng_uprobes_unregister_event(event_recorder); |
149b9a9d YB |
1511 | ret = 0; |
1512 | break; | |
b4a75708 | 1513 | |
c570be0d MJ |
1514 | case LTTNG_KERNEL_ABI_FUNCTION: |
1515 | lttng_fallthrough; | |
baf20995 MD |
1516 | default: |
1517 | WARN_ON_ONCE(1); | |
1518 | } | |
38b35aff | 1519 | WARN_ON_ONCE(ret); |
3c997079 | 1520 | if (!ret) |
a67ba386 | 1521 | event_priv->registered = 0; |
38b35aff MD |
1522 | } |
1523 | ||
1524 | static | |
1525 | void _lttng_event_unregister(struct lttng_kernel_event_recorder *event_recorder) | |
1526 | { | |
1527 | if (event_recorder->priv->parent.registered) | |
1528 | unregister_event(event_recorder); | |
dda6a249 MD |
1529 | } |
1530 | ||
dffef45d FD |
1531 | /* Only used for tracepoints for now. */ |
1532 | static | |
a67ba386 | 1533 | void register_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1534 | { |
437d5aa5 | 1535 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1536 | int ret = -EINVAL; |
1537 | ||
38b35aff | 1538 | WARN_ON_ONCE(event_notifier->priv->parent.registered); |
dffef45d | 1539 | |
a67ba386 MD |
1540 | desc = event_notifier->priv->parent.desc; |
1541 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1542 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1543 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
e69abdfd | 1544 | desc->tp_class->probe_callback, |
b01155ba FD |
1545 | event_notifier); |
1546 | break; | |
b4a75708 | 1547 | |
606828e4 | 1548 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1549 | ret = lttng_syscall_filter_enable_event_notifier(event_notifier); |
1550 | break; | |
b4a75708 | 1551 | |
c570be0d MJ |
1552 | case LTTNG_KERNEL_ABI_KPROBE: |
1553 | lttng_fallthrough; | |
606828e4 | 1554 | case LTTNG_KERNEL_ABI_UPROBE: |
2b16f0c9 FD |
1555 | ret = 0; |
1556 | break; | |
b4a75708 | 1557 | |
c570be0d MJ |
1558 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1559 | lttng_fallthrough; | |
1560 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1561 | lttng_fallthrough; | |
1562 | case LTTNG_KERNEL_ABI_NOOP: | |
1563 | lttng_fallthrough; | |
dffef45d FD |
1564 | default: |
1565 | WARN_ON_ONCE(1); | |
1566 | } | |
1567 | if (!ret) | |
a67ba386 | 1568 | event_notifier->priv->parent.registered = 1; |
dffef45d FD |
1569 | } |
1570 | ||
1571 | static | |
38b35aff | 1572 | int unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1573 | { |
437d5aa5 | 1574 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1575 | int ret = -EINVAL; |
1576 | ||
38b35aff | 1577 | WARN_ON_ONCE(!event_notifier->priv->parent.registered); |
dffef45d | 1578 | |
a67ba386 MD |
1579 | desc = event_notifier->priv->parent.desc; |
1580 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1581 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1582 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname, |
e69abdfd | 1583 | event_notifier->priv->parent.desc->tp_class->probe_callback, |
b01155ba FD |
1584 | event_notifier); |
1585 | break; | |
b4a75708 | 1586 | |
606828e4 | 1587 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1588 | lttng_kprobes_unregister_event_notifier(event_notifier); |
1589 | ret = 0; | |
1590 | break; | |
b4a75708 | 1591 | |
606828e4 | 1592 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1593 | lttng_uprobes_unregister_event_notifier(event_notifier); |
1594 | ret = 0; | |
1595 | break; | |
b4a75708 | 1596 | |
606828e4 | 1597 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1598 | ret = lttng_syscall_filter_disable_event_notifier(event_notifier); |
1599 | break; | |
b4a75708 | 1600 | |
c570be0d MJ |
1601 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1602 | lttng_fallthrough; | |
1603 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1604 | lttng_fallthrough; | |
1605 | case LTTNG_KERNEL_ABI_NOOP: | |
1606 | lttng_fallthrough; | |
dffef45d FD |
1607 | default: |
1608 | WARN_ON_ONCE(1); | |
1609 | } | |
1610 | if (!ret) | |
a67ba386 | 1611 | event_notifier->priv->parent.registered = 0; |
dffef45d FD |
1612 | return ret; |
1613 | } | |
1614 | ||
38b35aff MD |
1615 | static |
1616 | void _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier) | |
1617 | { | |
1618 | if (event_notifier->priv->parent.registered) | |
1619 | unregister_event_notifier(event_notifier); | |
1620 | } | |
1621 | ||
dda6a249 MD |
1622 | /* |
1623 | * Only used internally at session destruction. | |
1624 | */ | |
be066e6c | 1625 | static |
0648898e | 1626 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1627 | { |
0648898e | 1628 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1629 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1630 | ||
0648898e MD |
1631 | lttng_free_event_filter_runtime(event); |
1632 | /* Free event enabler refs */ | |
1633 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1634 | &event_priv->enablers_ref_head, node) | |
1635 | kfree(enabler_ref); | |
b4a75708 | 1636 | |
0648898e MD |
1637 | switch (event->type) { |
1638 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1639 | { | |
1640 | struct lttng_kernel_event_recorder *event_recorder = | |
1641 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1642 | |
0648898e MD |
1643 | switch (event_priv->instrumentation) { |
1644 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1645 | lttng_event_desc_put(event_priv->desc); | |
1646 | break; | |
b4a75708 | 1647 | |
0648898e MD |
1648 | case LTTNG_KERNEL_ABI_KPROBE: |
1649 | module_put(event_priv->desc->owner); | |
1650 | lttng_kprobes_destroy_event_private(event_recorder); | |
1651 | break; | |
b4a75708 | 1652 | |
0648898e MD |
1653 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1654 | module_put(event_priv->desc->owner); | |
1655 | lttng_kretprobes_destroy_private(event_recorder); | |
1656 | break; | |
b4a75708 | 1657 | |
0648898e MD |
1658 | case LTTNG_KERNEL_ABI_SYSCALL: |
1659 | break; | |
4e3c1b9b | 1660 | |
0648898e MD |
1661 | case LTTNG_KERNEL_ABI_UPROBE: |
1662 | module_put(event_priv->desc->owner); | |
1663 | lttng_uprobes_destroy_event_private(event_recorder); | |
1664 | break; | |
3ef5cc03 | 1665 | |
c570be0d MJ |
1666 | case LTTNG_KERNEL_ABI_FUNCTION: |
1667 | lttng_fallthrough; | |
1668 | case LTTNG_KERNEL_ABI_NOOP: | |
1669 | lttng_fallthrough; | |
0648898e MD |
1670 | default: |
1671 | WARN_ON_ONCE(1); | |
1672 | } | |
1673 | list_del(&event_recorder->priv->node); | |
1674 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1675 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1676 | break; |
0648898e MD |
1677 | } |
1678 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1679 | { | |
1680 | struct lttng_kernel_event_notifier *event_notifier = | |
1681 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1682 | |
0648898e MD |
1683 | switch (event_notifier->priv->parent.instrumentation) { |
1684 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1685 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1686 | break; | |
b4a75708 | 1687 | |
0648898e MD |
1688 | case LTTNG_KERNEL_ABI_KPROBE: |
1689 | module_put(event_notifier->priv->parent.desc->owner); | |
1690 | lttng_kprobes_destroy_event_notifier_private(event_notifier); | |
1691 | break; | |
b4a75708 | 1692 | |
0648898e MD |
1693 | case LTTNG_KERNEL_ABI_SYSCALL: |
1694 | break; | |
b4a75708 | 1695 | |
0648898e MD |
1696 | case LTTNG_KERNEL_ABI_UPROBE: |
1697 | module_put(event_notifier->priv->parent.desc->owner); | |
1698 | lttng_uprobes_destroy_event_notifier_private(event_notifier); | |
1699 | break; | |
1700 | ||
c570be0d MJ |
1701 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1702 | lttng_fallthrough; | |
1703 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1704 | lttng_fallthrough; | |
1705 | case LTTNG_KERNEL_ABI_NOOP: | |
1706 | lttng_fallthrough; | |
0648898e MD |
1707 | default: |
1708 | WARN_ON_ONCE(1); | |
1709 | } | |
1710 | list_del(&event_notifier->priv->node); | |
1711 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1712 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1713 | break; | |
1714 | } | |
dffef45d FD |
1715 | default: |
1716 | WARN_ON_ONCE(1); | |
1717 | } | |
dffef45d FD |
1718 | } |
1719 | ||
a2fa977a | 1720 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1721 | enum tracker_type tracker_type) |
e0130fab | 1722 | { |
d1f652f8 MD |
1723 | switch (tracker_type) { |
1724 | case TRACKER_PID: | |
1725 | return &session->pid_tracker; | |
1726 | case TRACKER_VPID: | |
1727 | return &session->vpid_tracker; | |
1728 | case TRACKER_UID: | |
1729 | return &session->uid_tracker; | |
1730 | case TRACKER_VUID: | |
1731 | return &session->vuid_tracker; | |
1732 | case TRACKER_GID: | |
1733 | return &session->gid_tracker; | |
1734 | case TRACKER_VGID: | |
1735 | return &session->vgid_tracker; | |
1736 | default: | |
1737 | WARN_ON_ONCE(1); | |
1738 | return NULL; | |
1739 | } | |
1740 | } | |
1741 | ||
a40e3229 | 1742 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1743 | enum tracker_type tracker_type, int id) |
1744 | { | |
a2fa977a | 1745 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1746 | int ret; |
1747 | ||
d1f652f8 MD |
1748 | tracker = get_tracker(session, tracker_type); |
1749 | if (!tracker) | |
1750 | return -EINVAL; | |
1751 | if (id < -1) | |
e0130fab MD |
1752 | return -EINVAL; |
1753 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1754 | if (id == -1) { |
1755 | /* track all ids: destroy tracker. */ | |
1756 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1757 | ret = 0; |
1758 | } else { | |
d1f652f8 | 1759 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1760 | } |
e0130fab MD |
1761 | mutex_unlock(&sessions_mutex); |
1762 | return ret; | |
1763 | } | |
1764 | ||
a40e3229 | 1765 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1766 | enum tracker_type tracker_type, int id) |
e0130fab | 1767 | { |
a2fa977a | 1768 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1769 | int ret; |
1770 | ||
d1f652f8 MD |
1771 | tracker = get_tracker(session, tracker_type); |
1772 | if (!tracker) | |
1773 | return -EINVAL; | |
1774 | if (id < -1) | |
e0130fab MD |
1775 | return -EINVAL; |
1776 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1777 | if (id == -1) { |
1778 | /* untrack all ids: replace by empty tracker. */ | |
1779 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1780 | } else { |
d1f652f8 | 1781 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1782 | } |
e0130fab MD |
1783 | mutex_unlock(&sessions_mutex); |
1784 | return ret; | |
1785 | } | |
1786 | ||
7e6f9ef6 | 1787 | static |
d1f652f8 | 1788 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1789 | { |
a2fa977a MD |
1790 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1791 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1792 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1793 | int iter = 0, i; |
1794 | ||
1795 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1796 | if (id_tracker_p) { |
1797 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1798 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1799 | |
f934e302 | 1800 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1801 | if (iter++ >= *pos) |
1802 | return e; | |
1803 | } | |
1804 | } | |
1805 | } else { | |
d1f652f8 | 1806 | /* ID tracker disabled. */ |
7e6f9ef6 | 1807 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1808 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1809 | } |
1810 | iter++; | |
1811 | } | |
1812 | /* End of list */ | |
1813 | return NULL; | |
1814 | } | |
1815 | ||
1816 | /* Called with sessions_mutex held. */ | |
1817 | static | |
d1f652f8 | 1818 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1819 | { |
a2fa977a MD |
1820 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1821 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1822 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1823 | int iter = 0, i; |
1824 | ||
1825 | (*ppos)++; | |
d1f652f8 MD |
1826 | if (id_tracker_p) { |
1827 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1828 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1829 | |
f934e302 | 1830 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1831 | if (iter++ >= *ppos) |
1832 | return e; | |
1833 | } | |
1834 | } | |
1835 | } else { | |
d1f652f8 | 1836 | /* ID tracker disabled. */ |
7e6f9ef6 | 1837 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1838 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1839 | iter++; |
1840 | } | |
1841 | ||
1842 | /* End of list */ | |
1843 | return NULL; | |
1844 | } | |
1845 | ||
1846 | static | |
d1f652f8 | 1847 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1848 | { |
1849 | mutex_unlock(&sessions_mutex); | |
1850 | } | |
1851 | ||
1852 | static | |
d1f652f8 | 1853 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1854 | { |
a2fa977a MD |
1855 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1856 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1857 | int id; |
7e6f9ef6 | 1858 | |
d1f652f8 | 1859 | if (p == id_tracker_p) { |
7e6f9ef6 | 1860 | /* Tracker disabled. */ |
d1f652f8 | 1861 | id = -1; |
7e6f9ef6 | 1862 | } else { |
d1f652f8 | 1863 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1864 | |
d1f652f8 MD |
1865 | id = lttng_id_tracker_get_node_id(e); |
1866 | } | |
a2fa977a | 1867 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1868 | case TRACKER_PID: |
1869 | seq_printf(m, "process { pid = %d; };\n", id); | |
1870 | break; | |
1871 | case TRACKER_VPID: | |
1872 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1873 | break; | |
1874 | case TRACKER_UID: | |
1875 | seq_printf(m, "user { uid = %d; };\n", id); | |
1876 | break; | |
1877 | case TRACKER_VUID: | |
1878 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1879 | break; | |
1880 | case TRACKER_GID: | |
1881 | seq_printf(m, "group { gid = %d; };\n", id); | |
1882 | break; | |
1883 | case TRACKER_VGID: | |
1884 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1885 | break; | |
1886 | default: | |
1887 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1888 | } |
7e6f9ef6 MD |
1889 | return 0; |
1890 | } | |
1891 | ||
1892 | static | |
d1f652f8 MD |
1893 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1894 | .start = id_list_start, | |
1895 | .next = id_list_next, | |
1896 | .stop = id_list_stop, | |
1897 | .show = id_list_show, | |
7e6f9ef6 MD |
1898 | }; |
1899 | ||
1900 | static | |
d1f652f8 | 1901 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1902 | { |
d1f652f8 | 1903 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1904 | } |
1905 | ||
1906 | static | |
d1f652f8 | 1907 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1908 | { |
1909 | struct seq_file *m = file->private_data; | |
a2fa977a | 1910 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1911 | int ret; |
1912 | ||
d1f652f8 | 1913 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1914 | ret = seq_release(inode, file); |
d1f652f8 | 1915 | if (!ret) |
a2fa977a | 1916 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1917 | return ret; |
1918 | } | |
1919 | ||
d1f652f8 | 1920 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1921 | .owner = THIS_MODULE, |
d1f652f8 | 1922 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1923 | .read = seq_read, |
1924 | .llseek = seq_lseek, | |
d1f652f8 | 1925 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1926 | }; |
1927 | ||
a40e3229 | 1928 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1929 | enum tracker_type tracker_type) |
7e6f9ef6 | 1930 | { |
d1f652f8 | 1931 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1932 | struct seq_file *m; |
1933 | int file_fd, ret; | |
1934 | ||
1935 | file_fd = lttng_get_unused_fd(); | |
1936 | if (file_fd < 0) { | |
1937 | ret = file_fd; | |
1938 | goto fd_error; | |
1939 | } | |
1940 | ||
d1f652f8 MD |
1941 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1942 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1943 | NULL, O_RDWR); |
d1f652f8 MD |
1944 | if (IS_ERR(tracker_ids_list_file)) { |
1945 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1946 | goto file_error; |
1947 | } | |
a40e3229 | 1948 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1949 | ret = -EOVERFLOW; |
9c1f4643 MD |
1950 | goto refcount_error; |
1951 | } | |
d1f652f8 | 1952 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1953 | if (ret < 0) |
1954 | goto open_error; | |
d1f652f8 MD |
1955 | m = tracker_ids_list_file->private_data; |
1956 | ||
1957 | m->private = get_tracker(session, tracker_type); | |
1958 | BUG_ON(!m->private); | |
1959 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1960 | |
1961 | return file_fd; | |
1962 | ||
1963 | open_error: | |
a40e3229 | 1964 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1965 | refcount_error: |
d1f652f8 | 1966 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1967 | file_error: |
1968 | put_unused_fd(file_fd); | |
1969 | fd_error: | |
1970 | return ret; | |
1971 | } | |
1972 | ||
3c997079 MD |
1973 | /* |
1974 | * Enabler management. | |
1975 | */ | |
1976 | static | |
4993071a PP |
1977 | int lttng_match_enabler_star_glob(const char *desc_name, |
1978 | const char *pattern) | |
3c997079 | 1979 | { |
cbc19040 MD |
1980 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1981 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1982 | return 0; |
1983 | return 1; | |
1984 | } | |
1985 | ||
1986 | static | |
4ecb5ad5 MD |
1987 | int lttng_match_enabler_name(const char *desc_name, |
1988 | const char *name) | |
3c997079 | 1989 | { |
4ecb5ad5 | 1990 | if (strcmp(desc_name, name)) |
3c997079 MD |
1991 | return 0; |
1992 | return 1; | |
1993 | } | |
1994 | ||
437d5aa5 | 1995 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
3c997079 MD |
1996 | struct lttng_enabler *enabler) |
1997 | { | |
4ecb5ad5 | 1998 | const char *desc_name, *enabler_name; |
badfe9f5 | 1999 | bool compat = false, entry = false; |
4ecb5ad5 MD |
2000 | |
2001 | enabler_name = enabler->event_param.name; | |
2002 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 2003 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 2004 | desc_name = desc->event_name; |
3b861b22 FD |
2005 | switch (enabler->format_type) { |
2006 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2007 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2008 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2009 | return lttng_match_enabler_name(desc_name, enabler_name); |
2010 | default: | |
2011 | return -EINVAL; | |
2012 | } | |
4ecb5ad5 | 2013 | break; |
b4a75708 | 2014 | |
606828e4 | 2015 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 2016 | desc_name = desc->event_name; |
badfe9f5 | 2017 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 2018 | desc_name += strlen("compat_"); |
badfe9f5 MD |
2019 | compat = true; |
2020 | } | |
4ecb5ad5 MD |
2021 | if (!strncmp(desc_name, "syscall_exit_", |
2022 | strlen("syscall_exit_"))) { | |
2023 | desc_name += strlen("syscall_exit_"); | |
2024 | } else if (!strncmp(desc_name, "syscall_entry_", | |
2025 | strlen("syscall_entry_"))) { | |
2026 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 2027 | entry = true; |
4ecb5ad5 MD |
2028 | } else { |
2029 | WARN_ON_ONCE(1); | |
2030 | return -EINVAL; | |
2031 | } | |
badfe9f5 | 2032 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 2033 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 2034 | break; |
606828e4 | 2035 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
2036 | if (!entry) |
2037 | return 0; | |
2038 | break; | |
606828e4 | 2039 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
2040 | if (entry) |
2041 | return 0; | |
2042 | break; | |
2043 | default: | |
2044 | return -EINVAL; | |
2045 | } | |
2046 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 2047 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 2048 | break; |
606828e4 | 2049 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
2050 | if (compat) |
2051 | return 0; | |
2052 | break; | |
606828e4 | 2053 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
2054 | if (!compat) |
2055 | return 0; | |
2056 | break; | |
2057 | default: | |
2058 | return -EINVAL; | |
2059 | } | |
2060 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2061 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2062 | switch (enabler->format_type) { |
2063 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2064 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2065 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2066 | return lttng_match_enabler_name(desc_name, enabler_name); |
2067 | default: | |
2068 | return -EINVAL; | |
2069 | } | |
2070 | break; | |
606828e4 | 2071 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2072 | return -EINVAL; /* Not implemented. */ |
2073 | default: | |
2074 | return -EINVAL; | |
2075 | } | |
4ecb5ad5 | 2076 | break; |
b4a75708 | 2077 | |
4ecb5ad5 MD |
2078 | default: |
2079 | WARN_ON_ONCE(1); | |
2080 | return -EINVAL; | |
2081 | } | |
3c997079 MD |
2082 | } |
2083 | ||
2084 | static | |
b2bc0bc8 | 2085 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
a67ba386 | 2086 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2087 | { |
b2bc0bc8 FD |
2088 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
2089 | event_enabler); | |
2090 | ||
a67ba386 | 2091 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2092 | return 0; |
a67ba386 MD |
2093 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2094 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2095 | return 1; |
2096 | else | |
2097 | return 0; | |
2098 | } | |
2099 | ||
b01155ba FD |
2100 | static |
2101 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2102 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba FD |
2103 | { |
2104 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
2105 | event_notifier_enabler); | |
2106 | ||
a67ba386 | 2107 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2108 | return 0; |
a67ba386 MD |
2109 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2110 | && event_notifier->priv->group == event_notifier_enabler->group | |
2111 | && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2112 | return 1; |
2113 | else | |
2114 | return 0; | |
2115 | } | |
2116 | ||
3c997079 | 2117 | static |
b2bc0bc8 FD |
2118 | struct lttng_enabler_ref *lttng_enabler_ref( |
2119 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2120 | struct lttng_enabler *enabler) |
2121 | { | |
2122 | struct lttng_enabler_ref *enabler_ref; | |
2123 | ||
b2bc0bc8 | 2124 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2125 | if (enabler_ref->ref == enabler) |
2126 | return enabler_ref; | |
2127 | } | |
2128 | return NULL; | |
2129 | } | |
2130 | ||
3c997079 | 2131 | static |
1b917d6b | 2132 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2133 | { |
ac847066 | 2134 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; |
437d5aa5 MD |
2135 | struct lttng_kernel_probe_desc *probe_desc; |
2136 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2137 | int i; |
2138 | struct list_head *probe_list; | |
2139 | ||
2140 | probe_list = lttng_get_probe_list_head(); | |
2141 | /* | |
2142 | * For each probe event, if we find that a probe event matches | |
2143 | * our enabler, create an associated lttng_event if not | |
2144 | * already present. | |
2145 | */ | |
2146 | list_for_each_entry(probe_desc, probe_list, head) { | |
2147 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2148 | int found = 0; | |
2149 | struct hlist_head *head; | |
a67ba386 MD |
2150 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2151 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2152 | |
2153 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2154 | if (!lttng_desc_match_enabler(desc, |
2155 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2156 | continue; |
3c997079 MD |
2157 | |
2158 | /* | |
2159 | * Check if already created. | |
2160 | */ | |
4a11ef1c | 2161 | head = utils_borrow_hash_table_bucket( |
a40e3229 | 2162 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 2163 | desc->event_name); |
a67ba386 MD |
2164 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2165 | if (event_recorder_private->parent.desc == desc | |
2166 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2167 | found = 1; |
2168 | } | |
2169 | if (found) | |
2170 | continue; | |
2171 | ||
2172 | /* | |
2173 | * We need to create an event for this | |
2174 | * event probe. | |
2175 | */ | |
a67ba386 MD |
2176 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan, |
2177 | NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT); | |
2178 | if (!event_recorder) { | |
5a15f70c | 2179 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2180 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2181 | } |
2182 | } | |
2183 | } | |
2184 | } | |
2185 | ||
b01155ba FD |
2186 | static |
2187 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2188 | { | |
2189 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2190 | struct lttng_kernel_probe_desc *probe_desc; |
2191 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2192 | int i; |
2193 | struct list_head *probe_list; | |
2194 | ||
2195 | probe_list = lttng_get_probe_list_head(); | |
2196 | /* | |
2197 | * For each probe event, if we find that a probe event matches | |
2198 | * our enabler, create an associated lttng_event_notifier if not | |
2199 | * already present. | |
2200 | */ | |
2201 | list_for_each_entry(probe_desc, probe_list, head) { | |
2202 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2203 | int found = 0; | |
2204 | struct hlist_head *head; | |
a67ba386 MD |
2205 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2206 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2207 | |
2208 | desc = probe_desc->event_desc[i]; | |
2209 | if (!lttng_desc_match_enabler(desc, | |
2210 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2211 | continue; | |
2212 | ||
2213 | /* | |
2214 | * Check if already created. | |
2215 | */ | |
2216 | head = utils_borrow_hash_table_bucket( | |
2217 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2218 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2219 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2220 | if (event_notifier_priv->parent.desc == desc | |
2221 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2222 | found = 1; |
2223 | } | |
2224 | if (found) | |
2225 | continue; | |
2226 | ||
2227 | /* | |
2228 | * We need to create a event_notifier for this event probe. | |
2229 | */ | |
2230 | event_notifier = _lttng_event_notifier_create(desc, | |
2231 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2232 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2233 | event_notifier_group, NULL, |
606828e4 | 2234 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2235 | if (IS_ERR(event_notifier)) { |
2236 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2237 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2238 | } |
2239 | } | |
2240 | } | |
2241 | } | |
2242 | ||
33a39a3c | 2243 | static |
1b917d6b | 2244 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2245 | { |
2246 | int ret; | |
2247 | ||
a67ba386 | 2248 | ret = lttng_syscalls_register_event(event_enabler); |
33a39a3c MD |
2249 | WARN_ON_ONCE(ret); |
2250 | } | |
2251 | ||
8a8ac9a8 FD |
2252 | static |
2253 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2254 | { | |
2255 | int ret; | |
2256 | ||
a67ba386 | 2257 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler); |
8a8ac9a8 | 2258 | WARN_ON_ONCE(ret); |
a67ba386 | 2259 | ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler); |
8a8ac9a8 FD |
2260 | WARN_ON_ONCE(ret); |
2261 | } | |
2262 | ||
33a39a3c | 2263 | /* |
a67ba386 | 2264 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2265 | * tracepoint probes. |
2266 | * Should be called with sessions mutex held. | |
2267 | */ | |
2268 | static | |
b2bc0bc8 | 2269 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2270 | { |
b2bc0bc8 | 2271 | switch (event_enabler->base.event_param.instrumentation) { |
606828e4 | 2272 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2273 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2274 | break; |
b4a75708 | 2275 | |
606828e4 | 2276 | case LTTNG_KERNEL_ABI_SYSCALL: |
1b917d6b | 2277 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2278 | break; |
b4a75708 | 2279 | |
33a39a3c MD |
2280 | default: |
2281 | WARN_ON_ONCE(1); | |
2282 | break; | |
2283 | } | |
2284 | } | |
2285 | ||
3c997079 | 2286 | /* |
b2bc0bc8 | 2287 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2288 | * and add backward reference from the event to the enabler. |
2289 | * Should be called with sessions mutex held. | |
2290 | */ | |
2291 | static | |
b2bc0bc8 | 2292 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2293 | { |
ac847066 MD |
2294 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
2295 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; | |
b2bc0bc8 | 2296 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); |
a67ba386 | 2297 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2298 | |
606828e4 MD |
2299 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2300 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2301 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2302 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2303 | int enabled = base_enabler->enabled; |
606828e4 | 2304 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2305 | |
606828e4 | 2306 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
ac847066 | 2307 | WRITE_ONCE(chan->priv->parent.syscall_all_entry, enabled); |
3b82c4e1 | 2308 | |
606828e4 | 2309 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
ac847066 | 2310 | WRITE_ONCE(chan->priv->parent.syscall_all_exit, enabled); |
badfe9f5 MD |
2311 | } |
2312 | ||
3c997079 | 2313 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2314 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2315 | |
b2bc0bc8 | 2316 | /* For each event matching event_enabler in session event list. */ |
a40e3229 | 2317 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2318 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2319 | struct lttng_enabler_ref *enabler_ref; |
2320 | ||
a67ba386 | 2321 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2322 | continue; |
a67ba386 | 2323 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
b2bc0bc8 | 2324 | lttng_event_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2325 | if (!enabler_ref) { |
2326 | /* | |
2327 | * If no backward ref, create it. | |
b2bc0bc8 | 2328 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2329 | */ |
2330 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2331 | if (!enabler_ref) | |
2332 | return -ENOMEM; | |
b2bc0bc8 | 2333 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 | 2334 | list_add(&enabler_ref->node, |
a67ba386 | 2335 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2336 | } |
2337 | ||
f127e61e MD |
2338 | /* |
2339 | * Link filter bytecodes if not linked yet. | |
2340 | */ | |
a67ba386 | 2341 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2342 | lttng_static_ctx, |
a67ba386 | 2343 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
60206944 | 2344 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2345 | } |
2346 | return 0; | |
2347 | } | |
2348 | ||
b01155ba | 2349 | /* |
a67ba386 | 2350 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2351 | * tracepoint probes. |
2352 | * Should be called with sessions mutex held. | |
2353 | */ | |
2354 | static | |
2355 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2356 | { | |
2357 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
606828e4 | 2358 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2359 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2360 | break; | |
b4a75708 | 2361 | |
606828e4 | 2362 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
2363 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); |
2364 | break; | |
b4a75708 | 2365 | |
b01155ba FD |
2366 | default: |
2367 | WARN_ON_ONCE(1); | |
2368 | break; | |
2369 | } | |
2370 | } | |
2371 | ||
2372 | /* | |
2373 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2374 | */ | |
2375 | static | |
8a8ac9a8 FD |
2376 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2377 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2378 | { |
2379 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2380 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2381 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2382 | |
606828e4 MD |
2383 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2384 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2385 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2386 | !strcmp(base_enabler->event_param.name, "*")) { |
2387 | ||
2388 | int enabled = base_enabler->enabled; | |
606828e4 | 2389 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2390 | |
606828e4 | 2391 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2392 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); |
2393 | ||
606828e4 | 2394 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2395 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); |
2396 | ||
2397 | } | |
2398 | ||
b01155ba FD |
2399 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2400 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2401 | ||
2402 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2403 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2404 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2405 | struct lttng_enabler_ref *enabler_ref; |
2406 | ||
2407 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2408 | continue; | |
2409 | ||
a67ba386 | 2410 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2411 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2412 | if (!enabler_ref) { | |
2413 | /* | |
2414 | * If no backward ref, create it. | |
2415 | * Add backward ref from event_notifier to enabler. | |
2416 | */ | |
2417 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2418 | if (!enabler_ref) | |
2419 | return -ENOMEM; | |
2420 | ||
2421 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2422 | event_notifier_enabler); | |
2423 | list_add(&enabler_ref->node, | |
a67ba386 | 2424 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2425 | } |
2426 | ||
2427 | /* | |
2428 | * Link filter bytecodes if not linked yet. | |
2429 | */ | |
a67ba386 MD |
2430 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2431 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2432 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2433 | |
2434 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2435 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2436 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2437 | &event_notifier_enabler->capture_bytecode_head); |
2438 | ||
a67ba386 | 2439 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2440 | } |
2441 | return 0; | |
2442 | } | |
2443 | ||
3c997079 MD |
2444 | /* |
2445 | * Called at module load: connect the probe on all enablers matching | |
2446 | * this event. | |
2447 | * Called with sessions lock held. | |
2448 | */ | |
2449 | int lttng_fix_pending_events(void) | |
2450 | { | |
a40e3229 | 2451 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2452 | |
a40e3229 MD |
2453 | list_for_each_entry(session_priv, &sessions, list) |
2454 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2455 | return 0; |
2456 | } | |
2457 | ||
b01155ba FD |
2458 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2459 | struct lttng_event_notifier_group *event_notifier_group) | |
2460 | { | |
2461 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2462 | ||
2463 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2464 | node) { | |
2465 | if (event_notifier_enabler->base.enabled) | |
2466 | return true; | |
2467 | } | |
2468 | return false; | |
2469 | } | |
2470 | ||
2471 | bool lttng_event_notifier_active(void) | |
2472 | { | |
2473 | struct lttng_event_notifier_group *event_notifier_group; | |
2474 | ||
2475 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2476 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2477 | return true; | |
2478 | } | |
2479 | return false; | |
2480 | } | |
2481 | ||
2482 | int lttng_fix_pending_event_notifiers(void) | |
2483 | { | |
2484 | struct lttng_event_notifier_group *event_notifier_group; | |
2485 | ||
2486 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2487 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2488 | return 0; | |
2489 | } | |
2490 | ||
b2bc0bc8 FD |
2491 | struct lttng_event_enabler *lttng_event_enabler_create( |
2492 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2493 | struct lttng_kernel_abi_event *event_param, |
ac847066 | 2494 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2495 | { |
b2bc0bc8 | 2496 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2497 | |
b2bc0bc8 FD |
2498 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2499 | if (!event_enabler) | |
3c997079 | 2500 | return NULL; |
b2bc0bc8 FD |
2501 | event_enabler->base.format_type = format_type; |
2502 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2503 | memcpy(&event_enabler->base.event_param, event_param, | |
2504 | sizeof(event_enabler->base.event_param)); | |
2505 | event_enabler->chan = chan; | |
3c997079 | 2506 | /* ctx left NULL */ |
b2bc0bc8 | 2507 | event_enabler->base.enabled = 0; |
3c997079 | 2508 | mutex_lock(&sessions_mutex); |
ac847066 MD |
2509 | list_add(&event_enabler->node, &event_enabler->chan->parent.session->priv->enablers_head); |
2510 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); | |
3c997079 | 2511 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2512 | return event_enabler; |
3c997079 MD |
2513 | } |
2514 | ||
b2bc0bc8 | 2515 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2516 | { |
2517 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2518 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
ac847066 | 2519 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2520 | mutex_unlock(&sessions_mutex); |
2521 | return 0; | |
2522 | } | |
2523 | ||
b2bc0bc8 | 2524 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2525 | { |
2526 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2527 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
ac847066 | 2528 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2529 | mutex_unlock(&sessions_mutex); |
2530 | return 0; | |
2531 | } | |
2532 | ||
b2bc0bc8 | 2533 | static |
183e8b3a | 2534 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
606828e4 | 2535 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2536 | { |
9906b046 | 2537 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2538 | uint32_t bytecode_len; |
2539 | int ret; | |
2540 | ||
2541 | ret = get_user(bytecode_len, &bytecode->len); | |
2542 | if (ret) | |
2543 | return ret; | |
52cfcdf3 | 2544 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2545 | GFP_KERNEL); |
2546 | if (!bytecode_node) | |
2547 | return -ENOMEM; | |
2548 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2549 | sizeof(*bytecode) + bytecode_len); | |
2550 | if (ret) | |
2551 | goto error_free; | |
b2bc0bc8 | 2552 | |
8a445457 | 2553 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2554 | bytecode_node->enabler = enabler; |
2555 | /* Enforce length based on allocated size */ | |
2556 | bytecode_node->bc.len = bytecode_len; | |
2557 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2558 | |
07dfc1d0 MD |
2559 | return 0; |
2560 | ||
2561 | error_free: | |
52cfcdf3 | 2562 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2563 | return ret; |
2564 | } | |
2565 | ||
183e8b3a | 2566 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
606828e4 | 2567 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2568 | { |
2569 | int ret; | |
183e8b3a | 2570 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2571 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2572 | if (ret) | |
2573 | goto error; | |
2574 | ||
ac847066 | 2575 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
b2bc0bc8 FD |
2576 | return 0; |
2577 | ||
2578 | error: | |
2579 | return ret; | |
2580 | } | |
2581 | ||
e2d5dbc7 | 2582 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2583 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2584 | { |
2585 | ||
e2d5dbc7 | 2586 | switch (event->priv->instrumentation) { |
606828e4 | 2587 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2588 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2589 | default: |
2590 | return -EINVAL; | |
2591 | } | |
2592 | } | |
2593 | ||
3c997079 MD |
2594 | static |
2595 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2596 | { | |
9906b046 | 2597 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2598 | |
2599 | /* Destroy filter bytecode */ | |
2600 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2601 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2602 | lttng_kvfree(filter_node); |
07dfc1d0 | 2603 | } |
b2bc0bc8 FD |
2604 | } |
2605 | ||
2606 | static | |
2607 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2608 | { | |
2609 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2610 | |
b2bc0bc8 FD |
2611 | list_del(&event_enabler->node); |
2612 | kfree(event_enabler); | |
3c997079 MD |
2613 | } |
2614 | ||
dffef45d FD |
2615 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2616 | struct lttng_event_notifier_group *event_notifier_group, | |
2617 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2618 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2619 | { |
2620 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2621 | ||
2622 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2623 | if (!event_notifier_enabler) | |
2624 | return NULL; | |
2625 | ||
2626 | event_notifier_enabler->base.format_type = format_type; | |
2627 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2628 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2629 | ||
99f52fcc | 2630 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2631 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2632 | |
8a8ac9a8 FD |
2633 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2634 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2635 | |
2636 | event_notifier_enabler->base.enabled = 0; | |
2637 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2638 | event_notifier_enabler->group = event_notifier_group; | |
2639 | ||
2640 | mutex_lock(&sessions_mutex); | |
2641 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2642 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2643 | |
2644 | mutex_unlock(&sessions_mutex); | |
2645 | ||
2646 | return event_notifier_enabler; | |
2647 | } | |
2648 | ||
2649 | int lttng_event_notifier_enabler_enable( | |
2650 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2651 | { | |
2652 | mutex_lock(&sessions_mutex); | |
2653 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2654 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2655 | mutex_unlock(&sessions_mutex); |
2656 | return 0; | |
2657 | } | |
2658 | ||
2659 | int lttng_event_notifier_enabler_disable( | |
2660 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2661 | { | |
2662 | mutex_lock(&sessions_mutex); | |
2663 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2664 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2665 | mutex_unlock(&sessions_mutex); |
2666 | return 0; | |
2667 | } | |
2668 | ||
183e8b3a | 2669 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d | 2670 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
606828e4 | 2671 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
dffef45d FD |
2672 | { |
2673 | int ret; | |
2674 | ||
183e8b3a | 2675 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2676 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2677 | bytecode); | |
2678 | if (ret) | |
2679 | goto error; | |
2680 | ||
b01155ba | 2681 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2682 | return 0; |
2683 | ||
2684 | error: | |
2685 | return ret; | |
2686 | } | |
2687 | ||
99d223ad FD |
2688 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2689 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2690 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2691 | { |
9906b046 | 2692 | struct lttng_kernel_bytecode_node *bytecode_node; |
99d223ad FD |
2693 | struct lttng_enabler *enabler = |
2694 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2695 | uint32_t bytecode_len; | |
2696 | int ret; | |
2697 | ||
2698 | ret = get_user(bytecode_len, &bytecode->len); | |
2699 | if (ret) | |
2700 | return ret; | |
2701 | ||
2702 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2703 | GFP_KERNEL); | |
2704 | if (!bytecode_node) | |
2705 | return -ENOMEM; | |
2706 | ||
2707 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2708 | sizeof(*bytecode) + bytecode_len); | |
2709 | if (ret) | |
2710 | goto error_free; | |
2711 | ||
8a445457 | 2712 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2713 | bytecode_node->enabler = enabler; |
2714 | ||
2715 | /* Enforce length based on allocated size */ | |
2716 | bytecode_node->bc.len = bytecode_len; | |
2717 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2718 | ||
2719 | event_notifier_enabler->num_captures++; | |
2720 | ||
2721 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2722 | goto end; | |
2723 | ||
2724 | error_free: | |
2725 | lttng_kvfree(bytecode_node); | |
2726 | end: | |
2727 | return ret; | |
2728 | } | |
2729 | ||
dffef45d FD |
2730 | static |
2731 | void lttng_event_notifier_enabler_destroy( | |
2732 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2733 | { | |
2734 | if (!event_notifier_enabler) { | |
2735 | return; | |
2736 | } | |
2737 | ||
2738 | list_del(&event_notifier_enabler->node); | |
2739 | ||
2740 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2741 | kfree(event_notifier_enabler); | |
2742 | } | |
2743 | ||
3c997079 | 2744 | /* |
b2bc0bc8 | 2745 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2746 | * session. |
2747 | * Should be called with sessions mutex held. | |
2748 | */ | |
2749 | static | |
a40e3229 | 2750 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2751 | { |
b2bc0bc8 | 2752 | struct lttng_event_enabler *event_enabler; |
a67ba386 | 2753 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2754 | |
a40e3229 | 2755 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2756 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2757 | /* |
2758 | * For each event, if at least one of its enablers is enabled, | |
2759 | * and its channel and session transient states are enabled, we | |
2760 | * enable the event, else we disable it. | |
2761 | */ | |
a40e3229 | 2762 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2763 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2764 | struct lttng_enabler_ref *enabler_ref; |
dc7350d6 | 2765 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2766 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2767 | int nr_filters = 0; | |
3c997079 | 2768 | |
a67ba386 | 2769 | switch (event_recorder_priv->parent.instrumentation) { |
c570be0d MJ |
2770 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2771 | lttng_fallthrough; | |
606828e4 | 2772 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
2773 | /* Enable events */ |
2774 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2775 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2776 | if (enabler_ref->ref->enabled) { |
2777 | enabled = 1; | |
2778 | break; | |
2779 | } | |
2780 | } | |
4ecb5ad5 | 2781 | break; |
b4a75708 | 2782 | |
4ecb5ad5 | 2783 | default: |
3c997079 MD |
2784 | /* Not handled with lazy sync. */ |
2785 | continue; | |
2786 | } | |
2787 | /* | |
2788 | * Enabled state is based on union of enablers, with | |
2789 | * intesection of session and channel transient enable | |
2790 | * states. | |
2791 | */ | |
ac847066 | 2792 | enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; |
3c997079 | 2793 | |
a67ba386 | 2794 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2795 | /* |
2796 | * Sync tracepoint registration with event enabled | |
2797 | * state. | |
2798 | */ | |
2799 | if (enabled) { | |
38b35aff MD |
2800 | if (!event_recorder_priv->parent.registered) |
2801 | register_event(event_recorder); | |
3c997079 | 2802 | } else { |
38b35aff MD |
2803 | if (event_recorder_priv->parent.registered) |
2804 | _lttng_event_unregister(event_recorder); | |
3c997079 | 2805 | } |
07dfc1d0 MD |
2806 | |
2807 | /* Check if has enablers without bytecode enabled */ | |
2808 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2809 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2810 | if (enabler_ref->ref->enabled |
2811 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2812 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2813 | break; |
2814 | } | |
2815 | } | |
a67ba386 | 2816 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2817 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2818 | |
2819 | /* Enable filters */ | |
2820 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2821 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2822 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2823 | nr_filters++; |
2824 | } | |
2825 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2826 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2827 | } |
2828 | } | |
2829 | ||
2830 | /* | |
2831 | * Apply enablers to session events, adding events to session if need | |
2832 | * be. It is required after each modification applied to an active | |
2833 | * session, and right before session "start". | |
2834 | * "lazy" sync means we only sync if required. | |
2835 | * Should be called with sessions mutex held. | |
2836 | */ | |
2837 | static | |
a40e3229 | 2838 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2839 | { |
2840 | /* We can skip if session is not active */ | |
2841 | if (!session->active) | |
2842 | return; | |
b2bc0bc8 | 2843 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2844 | } |
2845 | ||
b01155ba FD |
2846 | static |
2847 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2848 | { | |
2849 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2850 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2851 | |
2852 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2853 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2854 | ||
2855 | /* | |
2856 | * For each event_notifier, if at least one of its enablers is enabled, | |
2857 | * we enable the event_notifier, else we disable it. | |
2858 | */ | |
a67ba386 MD |
2859 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2860 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2861 | struct lttng_enabler_ref *enabler_ref; |
dc7350d6 | 2862 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2863 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2864 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2865 | |
a67ba386 | 2866 | switch (event_notifier_priv->parent.instrumentation) { |
c570be0d MJ |
2867 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2868 | lttng_fallthrough; | |
606828e4 | 2869 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
2870 | /* Enable event_notifiers */ |
2871 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2872 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2873 | if (enabler_ref->ref->enabled) { |
2874 | enabled = 1; | |
2875 | break; | |
2876 | } | |
2877 | } | |
2878 | break; | |
b4a75708 | 2879 | |
b01155ba FD |
2880 | default: |
2881 | /* Not handled with sync. */ | |
2882 | continue; | |
2883 | } | |
2884 | ||
a67ba386 | 2885 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2886 | /* |
2887 | * Sync tracepoint registration with event_notifier enabled | |
2888 | * state. | |
2889 | */ | |
2890 | if (enabled) { | |
a67ba386 | 2891 | if (!event_notifier_priv->parent.registered) |
b01155ba FD |
2892 | register_event_notifier(event_notifier); |
2893 | } else { | |
a67ba386 | 2894 | if (event_notifier_priv->parent.registered) |
38b35aff | 2895 | unregister_event_notifier(event_notifier); |
b01155ba FD |
2896 | } |
2897 | ||
2898 | /* Check if has enablers without bytecode enabled */ | |
2899 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2900 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2901 | if (enabler_ref->ref->enabled |
2902 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2903 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2904 | break; |
2905 | } | |
2906 | } | |
a67ba386 | 2907 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2908 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2909 | |
2910 | /* Enable filters */ | |
2911 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2912 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2913 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2914 | nr_filters++; |
2915 | } | |
2916 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2917 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2918 | |
2919 | /* Enable captures */ | |
2920 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2921 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2922 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2923 | nr_captures++; |
2924 | } | |
2925 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2926 | } |
2927 | } | |
2928 | ||
1ec3f75a | 2929 | /* |
d83004aa JD |
2930 | * Serialize at most one packet worth of metadata into a metadata |
2931 | * channel. | |
92d9f5e6 MD |
2932 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2933 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2934 | * allows us to do racy operations such as looking for remaining space left in | |
2935 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2936 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2937 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2938 | * Returns the number of bytes written in the channel, 0 if no data |
2939 | * was written and a negative value on error. | |
1ec3f75a | 2940 | */ |
b3b8072b | 2941 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
4071a628 | 2942 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2943 | { |
e27e4381 | 2944 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2945 | int ret = 0; |
2946 | size_t len, reserve_len; | |
2947 | ||
f613e3e6 | 2948 | /* |
92d9f5e6 MD |
2949 | * Ensure we support mutiple get_next / put sequences followed by |
2950 | * put_next. The metadata cache lock protects reading the metadata | |
2951 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2952 | * "flush" operations on the buffer invoked by different processes. | |
2953 | * Moreover, since the metadata cache memory can be reallocated, we | |
2954 | * need to have exclusive access against updates even though we only | |
2955 | * read it. | |
f613e3e6 | 2956 | */ |
92d9f5e6 | 2957 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2958 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2959 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2960 | goto end; |
f613e3e6 | 2961 | |
9616f0bf JD |
2962 | /* Metadata regenerated, change the version. */ |
2963 | if (stream->metadata_cache->version != stream->version) | |
2964 | stream->version = stream->metadata_cache->version; | |
2965 | ||
d83004aa | 2966 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2967 | stream->metadata_in; |
9de2c215 | 2968 | if (!len) |
de23d59d | 2969 | goto end; |
d83004aa | 2970 | reserve_len = min_t(size_t, |
da1fe18f | 2971 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2972 | len); |
a775608d | 2973 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
c7d9db61 | 2974 | sizeof(char), NULL); |
d83004aa JD |
2975 | /* |
2976 | * If reservation failed, return an error to the caller. | |
2977 | */ | |
cefd899f | 2978 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2979 | if (ret != 0) { |
2980 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2981 | stream->coherent = false; |
d83004aa JD |
2982 | goto end; |
2983 | } | |
b3b8072b | 2984 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2985 | stream->metadata_cache->data + stream->metadata_in, |
77fcffef | 2986 | reserve_len, 1); |
b3b8072b | 2987 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2988 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2989 | if (reserve_len < len) |
8b97fd42 MD |
2990 | stream->coherent = false; |
2991 | else | |
2992 | stream->coherent = true; | |
d83004aa JD |
2993 | ret = reserve_len; |
2994 | ||
2995 | end: | |
8b97fd42 MD |
2996 | if (coherent) |
2997 | *coherent = stream->coherent; | |
92d9f5e6 | 2998 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2999 | return ret; |
3000 | } | |
3001 | ||
8b97fd42 | 3002 | static |
a40e3229 | 3003 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 3004 | { |
a40e3229 MD |
3005 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
3006 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
3007 | } |
3008 | ||
3009 | static | |
a40e3229 | 3010 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 3011 | { |
a40e3229 MD |
3012 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3013 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
3014 | struct lttng_metadata_stream *stream; |
3015 | ||
a40e3229 | 3016 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 3017 | wake_up_interruptible(&stream->read_wait); |
a40e3229 | 3018 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 3019 | } |
8b97fd42 MD |
3020 | } |
3021 | ||
d83004aa JD |
3022 | /* |
3023 | * Write the metadata to the metadata cache. | |
3024 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
3025 | * The metadata cache lock protects us from concurrent read access from |
3026 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
3027 | * The content of the printf is printed as a single atomic metadata |
3028 | * transaction. | |
d83004aa | 3029 | */ |
a40e3229 | 3030 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
3031 | const char *fmt, ...) |
3032 | { | |
c099397a | 3033 | char *str; |
d83004aa | 3034 | size_t len; |
c099397a MD |
3035 | va_list ap; |
3036 | ||
585e5dcc | 3037 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
3038 | |
3039 | va_start(ap, fmt); | |
3040 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
3041 | va_end(ap); | |
3042 | if (!str) | |
3043 | return -ENOMEM; | |
3044 | ||
1ec3f75a | 3045 | len = strlen(str); |
a40e3229 MD |
3046 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3047 | if (session->priv->metadata_cache->metadata_written + len > | |
3048 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
3049 | char *tmp_cache_realloc; |
3050 | unsigned int tmp_cache_alloc_size; | |
3051 | ||
3052 | tmp_cache_alloc_size = max_t(unsigned int, | |
a40e3229 MD |
3053 | session->priv->metadata_cache->cache_alloc + len, |
3054 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 3055 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
3056 | if (!tmp_cache_realloc) |
3057 | goto err; | |
a40e3229 | 3058 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 3059 | memcpy(tmp_cache_realloc, |
a40e3229 MD |
3060 | session->priv->metadata_cache->data, |
3061 | session->priv->metadata_cache->cache_alloc); | |
3062 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
3063 | } |
3064 | ||
a40e3229 MD |
3065 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3066 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3067 | } |
a40e3229 MD |
3068 | memcpy(session->priv->metadata_cache->data + |
3069 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3070 | str, len); |
a40e3229 | 3071 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3072 | kfree(str); |
d83004aa | 3073 | |
d83004aa JD |
3074 | return 0; |
3075 | ||
3076 | err: | |
3077 | kfree(str); | |
3078 | return -ENOMEM; | |
c099397a MD |
3079 | } |
3080 | ||
f513b2bf | 3081 | static |
a40e3229 | 3082 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3083 | { |
3084 | size_t i; | |
3085 | ||
3086 | for (i = 0; i < nesting; i++) { | |
3087 | int ret; | |
3088 | ||
3089 | ret = lttng_metadata_printf(session, " "); | |
3090 | if (ret) { | |
3091 | return ret; | |
3092 | } | |
3093 | } | |
3094 | return 0; | |
3095 | } | |
3096 | ||
ceabb767 | 3097 | static |
a40e3229 | 3098 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3099 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3100 | size_t nesting) |
3101 | { | |
3102 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3103 | } | |
3104 | ||
3105 | static | |
a40e3229 | 3106 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3107 | const struct lttng_kernel_type_integer *type, |
3108 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3109 | size_t nesting) |
3110 | { | |
3111 | int ret; | |
3112 | ||
ceabb767 MD |
3113 | ret = print_tabs(session, nesting); |
3114 | if (ret) | |
3115 | return ret; | |
3116 | ret = lttng_metadata_printf(session, | |
3117 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3118 | type->size, |
3119 | type->alignment, | |
3120 | type->signedness, | |
3121 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3122 | ? "none" |
437d5aa5 | 3123 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3124 | ? "UTF8" |
3125 | : "ASCII", | |
437d5aa5 | 3126 | type->base, |
ceabb767 | 3127 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3128 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3129 | #else |
437d5aa5 | 3130 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3131 | #endif |
3132 | ); | |
3133 | return ret; | |
3134 | } | |
3135 | ||
f513b2bf MD |
3136 | /* |
3137 | * Must be called with sessions_mutex held. | |
3138 | */ | |
3139 | static | |
a40e3229 | 3140 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3141 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3142 | size_t nesting) |
3143 | { | |
f0039724 | 3144 | const char *prev_field_name = NULL; |
f513b2bf MD |
3145 | int ret; |
3146 | uint32_t i, nr_fields; | |
ceabb767 MD |
3147 | unsigned int alignment; |
3148 | ||
f513b2bf MD |
3149 | ret = print_tabs(session, nesting); |
3150 | if (ret) | |
3151 | return ret; | |
3152 | ret = lttng_metadata_printf(session, | |
3153 | "struct {\n"); | |
3154 | if (ret) | |
3155 | return ret; | |
437d5aa5 | 3156 | nr_fields = type->nr_fields; |
f513b2bf | 3157 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3158 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3159 | |
437d5aa5 | 3160 | iter_field = type->fields[i]; |
f0039724 | 3161 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3162 | if (ret) |
3163 | return ret; | |
3164 | } | |
3165 | ret = print_tabs(session, nesting); | |
3166 | if (ret) | |
3167 | return ret; | |
437d5aa5 | 3168 | alignment = type->alignment; |
ceabb767 MD |
3169 | if (alignment) { |
3170 | ret = lttng_metadata_printf(session, | |
3171 | "} align(%u)", | |
3172 | alignment); | |
3173 | } else { | |
3174 | ret = lttng_metadata_printf(session, | |
3175 | "}"); | |
3176 | } | |
f513b2bf MD |
3177 | return ret; |
3178 | } | |
3179 | ||
3180 | /* | |
3181 | * Must be called with sessions_mutex held. | |
3182 | */ | |
3183 | static | |
a40e3229 | 3184 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3185 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3186 | size_t nesting) |
3187 | { | |
3188 | int ret; | |
3189 | ||
3190 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3191 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3192 | if (ret) |
3193 | return ret; | |
ceabb767 | 3194 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3195 | } |
3196 | ||
65c85aa6 MD |
3197 | /* |
3198 | * Must be called with sessions_mutex held. | |
3199 | */ | |
3200 | static | |
a40e3229 | 3201 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3202 | const struct lttng_kernel_type_variant *type, |
f0039724 MD |
3203 | size_t nesting, |
3204 | const char *prev_field_name) | |
65c85aa6 | 3205 | { |
f0039724 | 3206 | const char *tag_name; |
65c85aa6 MD |
3207 | int ret; |
3208 | uint32_t i, nr_choices; | |
3209 | ||
f0039724 MD |
3210 | tag_name = type->tag_name; |
3211 | if (!tag_name) | |
3212 | tag_name = prev_field_name; | |
3213 | if (!tag_name) | |
3214 | return -EINVAL; | |
ceabb767 MD |
3215 | /* |
3216 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3217 | */ | |
437d5aa5 | 3218 | if (type->alignment != 0) |
ceabb767 | 3219 | return -EINVAL; |
65c85aa6 MD |
3220 | ret = print_tabs(session, nesting); |
3221 | if (ret) | |
3222 | return ret; | |
3223 | ret = lttng_metadata_printf(session, | |
3224 | "variant <_%s> {\n", | |
f0039724 | 3225 | tag_name); |
65c85aa6 MD |
3226 | if (ret) |
3227 | return ret; | |
437d5aa5 | 3228 | nr_choices = type->nr_choices; |
65c85aa6 | 3229 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3230 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3231 | |
437d5aa5 | 3232 | iter_field = type->choices[i]; |
f0039724 | 3233 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3234 | if (ret) |
3235 | return ret; | |
3236 | } | |
3237 | ret = print_tabs(session, nesting); | |
3238 | if (ret) | |
3239 | return ret; | |
3240 | ret = lttng_metadata_printf(session, | |
3241 | "}"); | |
3242 | return ret; | |
3243 | } | |
3244 | ||
3245 | /* | |
3246 | * Must be called with sessions_mutex held. | |
3247 | */ | |
3248 | static | |
a40e3229 | 3249 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3250 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3251 | size_t nesting, |
3252 | const char *prev_field_name) | |
65c85aa6 MD |
3253 | { |
3254 | int ret; | |
3255 | ||
3256 | ret = _lttng_variant_type_statedump(session, | |
f0039724 MD |
3257 | lttng_kernel_get_type_variant(field->type), nesting, |
3258 | prev_field_name); | |
65c85aa6 MD |
3259 | if (ret) |
3260 | return ret; | |
ceabb767 | 3261 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3262 | } |
3263 | ||
f513b2bf MD |
3264 | /* |
3265 | * Must be called with sessions_mutex held. | |
3266 | */ | |
3267 | static | |
a40e3229 | 3268 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3269 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3270 | size_t nesting) |
3271 | { | |
3272 | int ret; | |
437d5aa5 MD |
3273 | const struct lttng_kernel_type_array *array_type; |
3274 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3275 | |
437d5aa5 MD |
3276 | array_type = lttng_kernel_get_type_array(field->type); |
3277 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3278 | |
437d5aa5 | 3279 | if (array_type->alignment) { |
ceabb767 | 3280 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3281 | if (ret) |
3282 | return ret; | |
ceabb767 MD |
3283 | ret = lttng_metadata_printf(session, |
3284 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3285 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3286 | field->name); |
3287 | if (ret) | |
3288 | return ret; | |
3289 | } | |
3290 | /* | |
3291 | * Nested compound types: Only array of structures and variants are | |
3292 | * currently supported. | |
3293 | */ | |
437d5aa5 | 3294 | elem_type = array_type->elem_type; |
12bb2edb MD |
3295 | switch (elem_type->type) { |
3296 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3297 | case lttng_kernel_type_struct: |
3298 | case lttng_kernel_type_variant: | |
3299 | ret = _lttng_type_statedump(session, elem_type, | |
3300 | array_type->encoding, nesting); | |
65c85aa6 MD |
3301 | if (ret) |
3302 | return ret; | |
3303 | break; | |
ceabb767 | 3304 | |
f513b2bf MD |
3305 | default: |
3306 | return -EINVAL; | |
3307 | } | |
3308 | ret = lttng_metadata_printf(session, | |
3309 | " _%s[%u];\n", | |
3310 | field->name, | |
437d5aa5 | 3311 | array_type->length); |
f513b2bf MD |
3312 | return ret; |
3313 | } | |
3314 | ||
3315 | /* | |
3316 | * Must be called with sessions_mutex held. | |
3317 | */ | |
3318 | static | |
a40e3229 | 3319 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3320 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3321 | size_t nesting, |
3322 | const char *prev_field_name) | |
f513b2bf MD |
3323 | { |
3324 | int ret; | |
3325 | const char *length_name; | |
437d5aa5 MD |
3326 | const struct lttng_kernel_type_sequence *sequence_type; |
3327 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3328 | |
437d5aa5 MD |
3329 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3330 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3331 | |
437d5aa5 | 3332 | length_name = sequence_type->length_name; |
f0039724 MD |
3333 | if (!length_name) |
3334 | length_name = prev_field_name; | |
3335 | if (!length_name) | |
3336 | return -EINVAL; | |
ceabb767 | 3337 | |
437d5aa5 | 3338 | if (sequence_type->alignment) { |
ceabb767 | 3339 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3340 | if (ret) |
3341 | return ret; | |
ceabb767 MD |
3342 | ret = lttng_metadata_printf(session, |
3343 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3344 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3345 | field->name); |
3346 | if (ret) | |
3347 | return ret; | |
3348 | } | |
3349 | ||
3350 | /* | |
3351 | * Nested compound types: Only array of structures and variants are | |
3352 | * currently supported. | |
3353 | */ | |
437d5aa5 | 3354 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3355 | switch (elem_type->type) { |
3356 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3357 | case lttng_kernel_type_struct: |
3358 | case lttng_kernel_type_variant: | |
3359 | ret = _lttng_type_statedump(session, elem_type, | |
3360 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3361 | if (ret) |
3362 | return ret; | |
3363 | break; | |
ceabb767 | 3364 | |
f513b2bf MD |
3365 | default: |
3366 | return -EINVAL; | |
3367 | } | |
3368 | ret = lttng_metadata_printf(session, | |
3369 | " _%s[ _%s ];\n", | |
3370 | field->name, | |
f0039724 | 3371 | length_name); |
f513b2bf MD |
3372 | return ret; |
3373 | } | |
3374 | ||
141ddf28 MD |
3375 | /* |
3376 | * Must be called with sessions_mutex held. | |
3377 | */ | |
3378 | static | |
a40e3229 | 3379 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3380 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3381 | size_t nesting) |
3382 | { | |
d96a4a7a | 3383 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3384 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3385 | int ret; |
3386 | unsigned int i, nr_entries; | |
3387 | ||
437d5aa5 | 3388 | container_type = type->container_type; |
12bb2edb | 3389 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3390 | ret = -EINVAL; |
3391 | goto end; | |
3392 | } | |
437d5aa5 | 3393 | enum_desc = type->desc; |
141ddf28 MD |
3394 | nr_entries = enum_desc->nr_entries; |
3395 | ||
3396 | ret = print_tabs(session, nesting); | |
3397 | if (ret) | |
3398 | goto end; | |
ceabb767 MD |
3399 | ret = lttng_metadata_printf(session, "enum : "); |
3400 | if (ret) | |
3401 | goto end; | |
437d5aa5 MD |
3402 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3403 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3404 | if (ret) |
ceabb767 MD |
3405 | goto end; |
3406 | ret = lttng_metadata_printf(session, " {\n"); | |
3407 | if (ret) | |
3408 | goto end; | |
141ddf28 MD |
3409 | /* Dump all entries */ |
3410 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3411 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3412 | int j, len; |
3413 | ||
3414 | ret = print_tabs(session, nesting + 1); | |
3415 | if (ret) | |
3416 | goto end; | |
3417 | ret = lttng_metadata_printf(session, | |
3418 | "\""); | |
3419 | if (ret) | |
3420 | goto end; | |
3421 | len = strlen(entry->string); | |
3422 | /* Escape the character '"' */ | |
3423 | for (j = 0; j < len; j++) { | |
3424 | char c = entry->string[j]; | |
3425 | ||
3426 | switch (c) { | |
3427 | case '"': | |
3428 | ret = lttng_metadata_printf(session, | |
3429 | "\\\""); | |
3430 | break; | |
3431 | case '\\': | |
3432 | ret = lttng_metadata_printf(session, | |
3433 | "\\\\"); | |
3434 | break; | |
3435 | default: | |
3436 | ret = lttng_metadata_printf(session, | |
3437 | "%c", c); | |
3438 | break; | |
3439 | } | |
3440 | if (ret) | |
3441 | goto end; | |
3442 | } | |
08ad1061 PP |
3443 | ret = lttng_metadata_printf(session, "\""); |
3444 | if (ret) | |
3445 | goto end; | |
3446 | ||
3447 | if (entry->options.is_auto) { | |
3448 | ret = lttng_metadata_printf(session, ",\n"); | |
3449 | if (ret) | |
3450 | goto end; | |
141ddf28 | 3451 | } else { |
7c559490 MD |
3452 | ret = lttng_metadata_printf(session, |
3453 | " = "); | |
3454 | if (ret) | |
3455 | goto end; | |
3456 | if (entry->start.signedness) | |
141ddf28 | 3457 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3458 | "%lld", (long long) entry->start.value); |
3459 | else | |
3460 | ret = lttng_metadata_printf(session, | |
3461 | "%llu", entry->start.value); | |
3462 | if (ret) | |
3463 | goto end; | |
3464 | if (entry->start.signedness == entry->end.signedness && | |
3465 | entry->start.value | |
3466 | == entry->end.value) { | |
141ddf28 | 3467 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3468 | ",\n"); |
3469 | } else { | |
3470 | if (entry->end.signedness) { | |
3471 | ret = lttng_metadata_printf(session, | |
3472 | " ... %lld,\n", | |
3473 | (long long) entry->end.value); | |
3474 | } else { | |
3475 | ret = lttng_metadata_printf(session, | |
3476 | " ... %llu,\n", | |
3477 | entry->end.value); | |
3478 | } | |
141ddf28 | 3479 | } |
7c559490 MD |
3480 | if (ret) |
3481 | goto end; | |
141ddf28 | 3482 | } |
141ddf28 MD |
3483 | } |
3484 | ret = print_tabs(session, nesting); | |
3485 | if (ret) | |
3486 | goto end; | |
ceabb767 | 3487 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3488 | end: |
3489 | return ret; | |
3490 | } | |
3491 | ||
d83004aa JD |
3492 | /* |
3493 | * Must be called with sessions_mutex held. | |
3494 | */ | |
c099397a | 3495 | static |
a40e3229 | 3496 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3497 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3498 | size_t nesting) |
3499 | { | |
3500 | int ret; | |
437d5aa5 | 3501 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3502 | |
437d5aa5 MD |
3503 | enum_type = lttng_kernel_get_type_enum(field->type); |
3504 | WARN_ON_ONCE(!enum_type); | |
3505 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3506 | if (ret) |
3507 | return ret; | |
3508 | return lttng_field_name_statedump(session, field, nesting); | |
3509 | } | |
3510 | ||
3511 | static | |
a40e3229 | 3512 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3513 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3514 | size_t nesting) |
3515 | { | |
3516 | int ret; | |
3517 | ||
437d5aa5 MD |
3518 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3519 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3520 | if (ret) |
3521 | return ret; | |
3522 | return lttng_field_name_statedump(session, field, nesting); | |
3523 | } | |
3524 | ||
3525 | static | |
a40e3229 | 3526 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3527 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3528 | size_t nesting) |
3529 | { | |
3530 | int ret; | |
3531 | ||
ceabb767 MD |
3532 | /* Default encoding is UTF8 */ |
3533 | ret = print_tabs(session, nesting); | |
3534 | if (ret) | |
3535 | return ret; | |
3536 | ret = lttng_metadata_printf(session, | |
3537 | "string%s", | |
437d5aa5 | 3538 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3539 | " { encoding = ASCII; }" : ""); |
3540 | return ret; | |
3541 | } | |
3542 | ||
3543 | static | |
a40e3229 | 3544 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3545 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3546 | size_t nesting) |
ceabb767 | 3547 | { |
437d5aa5 | 3548 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3549 | int ret; |
3550 | ||
437d5aa5 MD |
3551 | string_type = lttng_kernel_get_type_string(field->type); |
3552 | WARN_ON_ONCE(!string_type); | |
3553 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3554 | if (ret) |
3555 | return ret; | |
3556 | return lttng_field_name_statedump(session, field, nesting); | |
3557 | } | |
3558 | ||
3559 | /* | |
3560 | * Must be called with sessions_mutex held. | |
3561 | */ | |
3562 | static | |
a40e3229 | 3563 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3564 | const struct lttng_kernel_type_common *type, |
3565 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3566 | size_t nesting) |
c099397a | 3567 | { |
c099397a | 3568 | int ret = 0; |
c099397a | 3569 | |
12bb2edb MD |
3570 | switch (type->type) { |
3571 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3572 | ret = _lttng_integer_type_statedump(session, |
3573 | lttng_kernel_get_type_integer(type), | |
3574 | parent_encoding, nesting); | |
8070f5c0 | 3575 | break; |
437d5aa5 MD |
3576 | case lttng_kernel_type_enum: |
3577 | ret = _lttng_enum_type_statedump(session, | |
3578 | lttng_kernel_get_type_enum(type), | |
3579 | nesting); | |
8070f5c0 | 3580 | break; |
12bb2edb | 3581 | case lttng_kernel_type_string: |
437d5aa5 MD |
3582 | ret = _lttng_string_type_statedump(session, |
3583 | lttng_kernel_get_type_string(type), | |
3584 | nesting); | |
ceabb767 | 3585 | break; |
437d5aa5 MD |
3586 | case lttng_kernel_type_struct: |
3587 | ret = _lttng_struct_type_statedump(session, | |
3588 | lttng_kernel_get_type_struct(type), | |
3589 | nesting); | |
8070f5c0 | 3590 | break; |
437d5aa5 MD |
3591 | case lttng_kernel_type_variant: |
3592 | ret = _lttng_variant_type_statedump(session, | |
3593 | lttng_kernel_get_type_variant(type), | |
f0039724 | 3594 | nesting, NULL); |
ceabb767 MD |
3595 | break; |
3596 | ||
3597 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3598 | case lttng_kernel_type_array: |
3599 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3600 | default: |
3601 | WARN_ON_ONCE(1); | |
3602 | return -EINVAL; | |
8070f5c0 | 3603 | } |
ceabb767 MD |
3604 | return ret; |
3605 | } | |
8070f5c0 | 3606 | |
ceabb767 MD |
3607 | /* |
3608 | * Must be called with sessions_mutex held. | |
3609 | */ | |
3610 | static | |
a40e3229 | 3611 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3612 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3613 | size_t nesting, |
3614 | const char **prev_field_name_p) | |
ceabb767 | 3615 | { |
f0039724 | 3616 | const char *prev_field_name = NULL; |
ceabb767 | 3617 | int ret = 0; |
27d2368e | 3618 | |
f0039724 MD |
3619 | if (prev_field_name_p) |
3620 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3621 | switch (field->type->type) { |
12bb2edb | 3622 | case lttng_kernel_type_integer: |
ceabb767 MD |
3623 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3624 | break; | |
437d5aa5 | 3625 | case lttng_kernel_type_enum: |
ceabb767 | 3626 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3627 | break; |
12bb2edb | 3628 | case lttng_kernel_type_string: |
ceabb767 | 3629 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3630 | break; |
437d5aa5 | 3631 | case lttng_kernel_type_struct: |
ceabb767 | 3632 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3633 | break; |
437d5aa5 | 3634 | case lttng_kernel_type_array: |
ceabb767 | 3635 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3636 | break; |
437d5aa5 | 3637 | case lttng_kernel_type_sequence: |
f0039724 | 3638 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3639 | break; |
437d5aa5 | 3640 | case lttng_kernel_type_variant: |
f0039724 | 3641 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3642 | break; |
f513b2bf | 3643 | |
8070f5c0 MD |
3644 | default: |
3645 | WARN_ON_ONCE(1); | |
3646 | return -EINVAL; | |
3647 | } | |
f0039724 MD |
3648 | if (prev_field_name_p) |
3649 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3650 | return ret; |
3651 | } | |
3652 | ||
3653 | static | |
a40e3229 | 3654 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3655 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3656 | { |
f0039724 | 3657 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3658 | int ret = 0; |
3659 | int i; | |
3660 | ||
3661 | if (!ctx) | |
3662 | return 0; | |
3663 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3664 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3665 | |
f0039724 | 3666 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3667 | if (ret) |
3668 | return ret; | |
3669 | } | |
3670 | return ret; | |
3671 | } | |
3672 | ||
3673 | static | |
a40e3229 | 3674 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3675 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3676 | { |
f0039724 | 3677 | const char *prev_field_name = NULL; |
a67ba386 | 3678 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3679 | int ret = 0; |
3680 | int i; | |
3681 | ||
e69abdfd MD |
3682 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3683 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3684 | |
f0039724 | 3685 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3686 | if (ret) |
3687 | return ret; | |
c099397a MD |
3688 | } |
3689 | return ret; | |
3690 | } | |
3691 | ||
d83004aa JD |
3692 | /* |
3693 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3694 | * The entire event metadata is printed as a single atomic metadata |
3695 | * transaction. | |
d83004aa | 3696 | */ |
c099397a | 3697 | static |
a40e3229 | 3698 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 3699 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3700 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3701 | { |
3702 | int ret = 0; | |
3703 | ||
a67ba386 | 3704 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3705 | return 0; |
ac847066 | 3706 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3707 | return 0; |
3708 | ||
8b97fd42 MD |
3709 | lttng_metadata_begin(session); |
3710 | ||
c099397a MD |
3711 | ret = lttng_metadata_printf(session, |
3712 | "event {\n" | |
ae734547 | 3713 | " name = \"%s\";\n" |
c099397a | 3714 | " id = %u;\n" |
b9074a1b | 3715 | " stream_id = %u;\n", |
a67ba386 MD |
3716 | event_recorder->priv->parent.desc->event_name, |
3717 | event_recorder->priv->id, | |
ac847066 | 3718 | event_recorder->chan->priv->id); |
c099397a MD |
3719 | if (ret) |
3720 | goto end; | |
3721 | ||
8070f5c0 | 3722 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3723 | " fields := struct {\n" |
3724 | ); | |
3725 | if (ret) | |
3726 | goto end; | |
3727 | ||
a67ba386 | 3728 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3729 | if (ret) |
3730 | goto end; | |
3731 | ||
3732 | /* | |
3733 | * LTTng space reservation can only reserve multiples of the | |
3734 | * byte size. | |
3735 | */ | |
3736 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3737 | " };\n" |
3738 | "};\n\n"); | |
c099397a MD |
3739 | if (ret) |
3740 | goto end; | |
3741 | ||
a67ba386 | 3742 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3743 | end: |
8b97fd42 | 3744 | lttng_metadata_end(session); |
c099397a MD |
3745 | return ret; |
3746 | ||
3747 | } | |
3748 | ||
d83004aa JD |
3749 | /* |
3750 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3751 | * The entire channel metadata is printed as a single atomic metadata |
3752 | * transaction. | |
d83004aa | 3753 | */ |
c099397a | 3754 | static |
a40e3229 | 3755 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 3756 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3757 | { |
3758 | int ret = 0; | |
3759 | ||
ac847066 | 3760 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3761 | return 0; |
d83004aa | 3762 | |
ac847066 | 3763 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3764 | return 0; |
3765 | ||
8b97fd42 MD |
3766 | lttng_metadata_begin(session); |
3767 | ||
ac847066 | 3768 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3769 | ret = lttng_metadata_printf(session, |
3770 | "stream {\n" | |
3771 | " id = %u;\n" | |
9115fbdc | 3772 | " event.header := %s;\n" |
b9074a1b | 3773 | " packet.context := struct packet_context;\n", |
ac847066 MD |
3774 | chan->priv->id, |
3775 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3776 | "struct event_header_large"); |
3777 | if (ret) | |
3778 | goto end; | |
3779 | ||
ac847066 | 3780 | if (chan->priv->ctx) { |
b9074a1b MD |
3781 | ret = lttng_metadata_printf(session, |
3782 | " event.context := struct {\n"); | |
3783 | if (ret) | |
3784 | goto end; | |
3785 | } | |
ac847066 | 3786 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3787 | if (ret) |
3788 | goto end; | |
ac847066 | 3789 | if (chan->priv->ctx) { |
b9074a1b MD |
3790 | ret = lttng_metadata_printf(session, |
3791 | " };\n"); | |
3792 | if (ret) | |
3793 | goto end; | |
3794 | } | |
8070f5c0 MD |
3795 | |
3796 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3797 | "};\n\n"); |
8070f5c0 | 3798 | |
ac847066 | 3799 | chan->priv->metadata_dumped = 1; |
c099397a | 3800 | end: |
8b97fd42 | 3801 | lttng_metadata_end(session); |
c099397a MD |
3802 | return ret; |
3803 | } | |
3804 | ||
d83004aa JD |
3805 | /* |
3806 | * Must be called with sessions_mutex held. | |
3807 | */ | |
9115fbdc | 3808 | static |
a40e3229 | 3809 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3810 | { |
3811 | return lttng_metadata_printf(session, | |
3812 | "struct packet_context {\n" | |
a3ccff4f MD |
3813 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3814 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3815 | " uint64_t content_size;\n" |
3816 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3817 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3818 | " unsigned long events_discarded;\n" |
9115fbdc | 3819 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3820 | "};\n\n" |
9115fbdc MD |
3821 | ); |
3822 | } | |
3823 | ||
3824 | /* | |
3825 | * Compact header: | |
3826 | * id: range: 0 - 30. | |
3827 | * id 31 is reserved to indicate an extended header. | |
3828 | * | |
3829 | * Large header: | |
3830 | * id: range: 0 - 65534. | |
3831 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3832 | * |
3833 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3834 | */ |
3835 | static | |
a40e3229 | 3836 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3837 | { |
3838 | return lttng_metadata_printf(session, | |
3839 | "struct event_header_compact {\n" | |
3840 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3841 | " variant <id> {\n" | |
3842 | " struct {\n" | |
a3ccff4f | 3843 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3844 | " } compact;\n" |
3845 | " struct {\n" | |
3846 | " uint32_t id;\n" | |
a3ccff4f | 3847 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3848 | " } extended;\n" |
3849 | " } v;\n" | |
3850 | "} align(%u);\n" | |
3851 | "\n" | |
3852 | "struct event_header_large {\n" | |
3853 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3854 | " variant <id> {\n" | |
3855 | " struct {\n" | |
a3ccff4f | 3856 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3857 | " } compact;\n" |
3858 | " struct {\n" | |
3859 | " uint32_t id;\n" | |
a3ccff4f | 3860 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3861 | " } extended;\n" |
3862 | " } v;\n" | |
3863 | "} align(%u);\n\n", | |
a90917c3 MD |
3864 | lttng_alignof(uint32_t) * CHAR_BIT, |
3865 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3866 | ); |
3867 | } | |
3868 | ||
a3ccff4f MD |
3869 | /* |
3870 | * Approximation of NTP time of day to clock monotonic correlation, | |
3871 | * taken at start of trace. | |
3872 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3873 | * in future versions. | |
5283350b MD |
3874 | * This function may return a negative offset. It may happen if the |
3875 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3876 | * |
3877 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3878 | * y2038 compliant. | |
a3ccff4f MD |
3879 | */ |
3880 | static | |
8967b2a3 | 3881 | int64_t measure_clock_offset(void) |
a3ccff4f | 3882 | { |
dcb93448 | 3883 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3884 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3885 | int64_t offset; |
a3ccff4f | 3886 | unsigned long flags; |
3636085f MJ |
3887 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3888 | struct timespec64 rts = { 0, 0 }; | |
3889 | #else | |
3890 | struct timespec rts = { 0, 0 }; | |
3891 | #endif | |
a3ccff4f MD |
3892 | |
3893 | /* Disable interrupts to increase correlation precision. */ | |
3894 | local_irq_save(flags); | |
3895 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3896 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3897 | ktime_get_real_ts64(&rts); | |
3898 | #else | |
216b6baa | 3899 | getnstimeofday(&rts); |
3636085f | 3900 | #endif |
a3ccff4f MD |
3901 | monotonic[1] = trace_clock_read64(); |
3902 | local_irq_restore(flags); | |
3903 | ||
dcb93448 | 3904 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3905 | realtime = (uint64_t) rts.tv_sec * tcf; |
3906 | if (tcf == NSEC_PER_SEC) { | |
3907 | realtime += rts.tv_nsec; | |
3908 | } else { | |
3909 | uint64_t n = rts.tv_nsec * tcf; | |
3910 | ||
3911 | do_div(n, NSEC_PER_SEC); | |
3912 | realtime += n; | |
3913 | } | |
dcb93448 | 3914 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3915 | return offset; |
3916 | } | |
3917 | ||
3eb95be4 | 3918 | static |
a40e3229 | 3919 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3920 | { |
0f3eaad4 | 3921 | int ret = 0; |
3eb95be4 JR |
3922 | size_t i; |
3923 | char cur; | |
3924 | ||
3925 | i = 0; | |
3926 | cur = string[i]; | |
3927 | while (cur != '\0') { | |
3928 | switch (cur) { | |
3929 | case '\n': | |
3930 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3931 | break; | |
3932 | case '\\': | |
3933 | case '"': | |
3934 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3935 | if (ret) | |
3936 | goto error; | |
3937 | /* We still print the current char */ | |
c570be0d | 3938 | lttng_fallthrough; |
3eb95be4 JR |
3939 | default: |
3940 | ret = lttng_metadata_printf(session, "%c", cur); | |
3941 | break; | |
3942 | } | |
3943 | ||
3944 | if (ret) | |
3945 | goto error; | |
3946 | ||
3947 | cur = string[++i]; | |
3948 | } | |
3949 | error: | |
3950 | return ret; | |
3951 | } | |
3952 | ||
3953 | static | |
a40e3229 | 3954 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3955 | const char *field_value) |
3eb95be4 JR |
3956 | { |
3957 | int ret; | |
3958 | ||
1c88f269 | 3959 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3960 | if (ret) |
3961 | goto error; | |
3962 | ||
1c88f269 | 3963 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3964 | if (ret) |
3965 | goto error; | |
3966 | ||
3967 | ret = lttng_metadata_printf(session, "\";\n"); | |
3968 | ||
3969 | error: | |
3970 | return ret; | |
3971 | } | |
3972 | ||
c099397a MD |
3973 | /* |
3974 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3975 | * Must be called with sessions_mutex held. |
c099397a MD |
3976 | */ |
3977 | static | |
a40e3229 | 3978 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3979 | { |
a40e3229 | 3980 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3981 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3982 | const char *product_uuid; |
ac847066 | 3983 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3984 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3985 | int ret = 0; |
3986 | ||
585e5dcc | 3987 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3988 | return 0; |
8b97fd42 MD |
3989 | |
3990 | lttng_metadata_begin(session); | |
3991 | ||
a40e3229 | 3992 | if (session->priv->metadata_dumped) |
c099397a | 3993 | goto skip_session; |
c099397a | 3994 | |
d793d5e1 | 3995 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3996 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3997 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3998 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3999 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
4000 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
4001 | |
4002 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
4003 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
4004 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
4005 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
4006 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 4007 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
4008 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
4009 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
4010 | "\n" |
4011 | "trace {\n" | |
4012 | " major = %u;\n" | |
4013 | " minor = %u;\n" | |
30bdb6e4 | 4014 | " uuid = \"%s\";\n" |
d793d5e1 MD |
4015 | " byte_order = %s;\n" |
4016 | " packet.header := struct {\n" | |
4017 | " uint32_t magic;\n" | |
1ec3f75a | 4018 | " uint8_t uuid[16];\n" |
d793d5e1 | 4019 | " uint32_t stream_id;\n" |
5594698f | 4020 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 4021 | " };\n" |
d793d5e1 | 4022 | "};\n\n", |
a90917c3 MD |
4023 | lttng_alignof(uint8_t) * CHAR_BIT, |
4024 | lttng_alignof(uint16_t) * CHAR_BIT, | |
4025 | lttng_alignof(uint32_t) * CHAR_BIT, | |
4026 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
4027 | sizeof(unsigned long) * CHAR_BIT, |
4028 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
4029 | CTF_SPEC_MAJOR, |
4030 | CTF_SPEC_MINOR, | |
d793d5e1 | 4031 | uuid_s, |
5214fa50 | 4032 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
4033 | "be" |
4034 | #else | |
4035 | "le" | |
4036 | #endif | |
4037 | ); | |
4038 | if (ret) | |
4039 | goto end; | |
4040 | ||
99dc9597 MD |
4041 | ret = lttng_metadata_printf(session, |
4042 | "env {\n" | |
a6058143 | 4043 | " hostname = \"%s\";\n" |
c6c9e10f | 4044 | " domain = \"kernel\";\n" |
99dc9597 | 4045 | " sysname = \"%s\";\n" |
c6c9e10f MD |
4046 | " kernel_release = \"%s\";\n" |
4047 | " kernel_version = \"%s\";\n" | |
4048 | " tracer_name = \"lttng-modules\";\n" | |
4049 | " tracer_major = %d;\n" | |
4050 | " tracer_minor = %d;\n" | |
4051 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 4052 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 4053 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
4054 | utsname()->sysname, |
4055 | utsname()->release, | |
c6c9e10f MD |
4056 | utsname()->version, |
4057 | LTTNG_MODULES_MAJOR_VERSION, | |
4058 | LTTNG_MODULES_MINOR_VERSION, | |
4059 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
4060 | ); |
4061 | if (ret) | |
4062 | goto end; | |
4063 | ||
a40e3229 | 4064 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
4065 | if (ret) |
4066 | goto end; | |
4067 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
a40e3229 | 4068 | session->priv->creation_time); |
3eb95be4 JR |
4069 | if (ret) |
4070 | goto end; | |
4071 | ||
c88f762e GB |
4072 | /* Add the product UUID to the 'env' section */ |
4073 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4074 | if (product_uuid) { | |
4075 | ret = lttng_metadata_printf(session, | |
4076 | " product_uuid = \"%s\";\n", | |
4077 | product_uuid | |
4078 | ); | |
4079 | if (ret) | |
4080 | goto end; | |
4081 | } | |
4082 | ||
4083 | /* Close the 'env' section */ | |
3eb95be4 JR |
4084 | ret = lttng_metadata_printf(session, "};\n\n"); |
4085 | if (ret) | |
4086 | goto end; | |
4087 | ||
a3ccff4f MD |
4088 | ret = lttng_metadata_printf(session, |
4089 | "clock {\n" | |
2754583e MD |
4090 | " name = \"%s\";\n", |
4091 | trace_clock_name() | |
a82c63f1 MD |
4092 | ); |
4093 | if (ret) | |
4094 | goto end; | |
4095 | ||
4096 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4097 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4098 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4099 | clock_uuid_s |
4100 | ); | |
4101 | if (ret) | |
4102 | goto end; | |
4103 | } | |
4104 | ||
4105 | ret = lttng_metadata_printf(session, | |
2754583e | 4106 | " description = \"%s\";\n" |
a3ccff4f MD |
4107 | " freq = %llu; /* Frequency, in Hz */\n" |
4108 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4109 | " offset = %lld;\n" |
a3ccff4f | 4110 | "};\n\n", |
2754583e | 4111 | trace_clock_description(), |
a3ccff4f | 4112 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4113 | (long long) measure_clock_offset() |
a3ccff4f MD |
4114 | ); |
4115 | if (ret) | |
4116 | goto end; | |
4117 | ||
4118 | ret = lttng_metadata_printf(session, | |
4119 | "typealias integer {\n" | |
4120 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4121 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4122 | "} := uint27_clock_monotonic_t;\n" |
4123 | "\n" | |
4124 | "typealias integer {\n" | |
4125 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4126 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4127 | "} := uint32_clock_monotonic_t;\n" |
4128 | "\n" | |
4129 | "typealias integer {\n" | |
4130 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4131 | " map = clock.%s.value;\n" |
a3ccff4f | 4132 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4133 | trace_clock_name(), |
a3ccff4f | 4134 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4135 | trace_clock_name(), |
4136 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4137 | trace_clock_name() | |
a3ccff4f MD |
4138 | ); |
4139 | if (ret) | |
4140 | goto end; | |
4141 | ||
a90917c3 | 4142 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4143 | if (ret) |
4144 | goto end; | |
4145 | ||
a90917c3 | 4146 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4147 | if (ret) |
4148 | goto end; | |
4149 | ||
c099397a | 4150 | skip_session: |
ac847066 MD |
4151 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4152 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4153 | if (ret) |
4154 | goto end; | |
4155 | } | |
4156 | ||
a40e3229 | 4157 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4158 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4159 | event_recorder_priv->pub); | |
c099397a MD |
4160 | if (ret) |
4161 | goto end; | |
4162 | } | |
a40e3229 | 4163 | session->priv->metadata_dumped = 1; |
c099397a | 4164 | end: |
8b97fd42 | 4165 | lttng_metadata_end(session); |
c099397a MD |
4166 | return ret; |
4167 | } | |
4168 | ||
c0e31d2e | 4169 | /** |
a90917c3 | 4170 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4171 | * @transport: transport structure |
4172 | * | |
4173 | * Registers a transport which can be used as output to extract the data out of | |
4174 | * LTTng. The module calling this registration function must ensure that no | |
4175 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4176 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4177 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4178 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4179 | * after its registration must it synchronize the TLBs. |
4180 | */ | |
a90917c3 | 4181 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4182 | { |
4183 | /* | |
4184 | * Make sure no page fault can be triggered by the module about to be | |
4185 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4186 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4187 | */ |
263b6c88 | 4188 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4189 | |
4190 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4191 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4192 | mutex_unlock(&sessions_mutex); |
4193 | } | |
a90917c3 | 4194 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4195 | |
4196 | /** | |
a90917c3 | 4197 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4198 | * @transport: transport structure |
4199 | */ | |
a90917c3 | 4200 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4201 | { |
4202 | mutex_lock(&sessions_mutex); | |
4203 | list_del(&transport->node); | |
4204 | mutex_unlock(&sessions_mutex); | |
4205 | } | |
a90917c3 | 4206 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4207 | |
a101fa10 MD |
4208 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4209 | { | |
4210 | /* | |
4211 | * Make sure no page fault can be triggered by the module about to be | |
4212 | * registered. We deal with this here so we don't have to call | |
4213 | * vmalloc_sync_mappings() in each module's init. | |
4214 | */ | |
4215 | wrapper_vmalloc_sync_mappings(); | |
4216 | ||
4217 | mutex_lock(&sessions_mutex); | |
4218 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4219 | mutex_unlock(&sessions_mutex); | |
4220 | } | |
4221 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4222 | ||
4223 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4224 | { | |
4225 | mutex_lock(&sessions_mutex); | |
4226 | list_del(&transport->node); | |
4227 | mutex_unlock(&sessions_mutex); | |
4228 | } | |
4229 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4230 | ||
5f4c791e | 4231 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4232 | |
4233 | enum cpuhp_state lttng_hp_prepare; | |
4234 | enum cpuhp_state lttng_hp_online; | |
4235 | ||
4236 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4237 | { | |
4238 | struct lttng_cpuhp_node *lttng_node; | |
4239 | ||
4240 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4241 | switch (lttng_node->component) { | |
4242 | case LTTNG_RING_BUFFER_FRONTEND: | |
4243 | return 0; | |
4244 | case LTTNG_RING_BUFFER_BACKEND: | |
4245 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4246 | case LTTNG_RING_BUFFER_ITER: | |
4247 | return 0; | |
4248 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4249 | return 0; | |
4250 | default: | |
4251 | return -EINVAL; | |
4252 | } | |
4253 | } | |
4254 | ||
4255 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4256 | { | |
4257 | struct lttng_cpuhp_node *lttng_node; | |
4258 | ||
4259 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4260 | switch (lttng_node->component) { | |
4261 | case LTTNG_RING_BUFFER_FRONTEND: | |
4262 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4263 | case LTTNG_RING_BUFFER_BACKEND: | |
4264 | return 0; | |
4265 | case LTTNG_RING_BUFFER_ITER: | |
4266 | return 0; | |
4267 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4268 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4269 | default: | |
4270 | return -EINVAL; | |
4271 | } | |
4272 | } | |
4273 | ||
4274 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4275 | { | |
4276 | struct lttng_cpuhp_node *lttng_node; | |
4277 | ||
4278 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4279 | switch (lttng_node->component) { | |
4280 | case LTTNG_RING_BUFFER_FRONTEND: | |
4281 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4282 | case LTTNG_RING_BUFFER_BACKEND: | |
4283 | return 0; | |
4284 | case LTTNG_RING_BUFFER_ITER: | |
4285 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4286 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4287 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4288 | default: | |
4289 | return -EINVAL; | |
4290 | } | |
4291 | } | |
4292 | ||
4293 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4294 | { | |
4295 | struct lttng_cpuhp_node *lttng_node; | |
4296 | ||
4297 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4298 | switch (lttng_node->component) { | |
4299 | case LTTNG_RING_BUFFER_FRONTEND: | |
4300 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4301 | case LTTNG_RING_BUFFER_BACKEND: | |
4302 | return 0; | |
4303 | case LTTNG_RING_BUFFER_ITER: | |
4304 | return 0; | |
4305 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4306 | return 0; | |
4307 | default: | |
4308 | return -EINVAL; | |
4309 | } | |
4310 | } | |
4311 | ||
4312 | static int __init lttng_init_cpu_hotplug(void) | |
4313 | { | |
4314 | int ret; | |
4315 | ||
4316 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4317 | lttng_hotplug_prepare, | |
4318 | lttng_hotplug_dead); | |
4319 | if (ret < 0) { | |
4320 | return ret; | |
4321 | } | |
4322 | lttng_hp_prepare = ret; | |
4323 | lttng_rb_set_hp_prepare(ret); | |
4324 | ||
4325 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4326 | lttng_hotplug_online, | |
4327 | lttng_hotplug_offline); | |
4328 | if (ret < 0) { | |
4329 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4330 | lttng_hp_prepare = 0; | |
4331 | return ret; | |
4332 | } | |
4333 | lttng_hp_online = ret; | |
4334 | lttng_rb_set_hp_online(ret); | |
4335 | ||
4336 | return 0; | |
4337 | } | |
4338 | ||
4339 | static void __exit lttng_exit_cpu_hotplug(void) | |
4340 | { | |
4341 | lttng_rb_set_hp_online(0); | |
4342 | cpuhp_remove_multi_state(lttng_hp_online); | |
4343 | lttng_rb_set_hp_prepare(0); | |
4344 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4345 | } | |
4346 | ||
5f4c791e | 4347 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4348 | static int lttng_init_cpu_hotplug(void) |
4349 | { | |
4350 | return 0; | |
4351 | } | |
4352 | static void lttng_exit_cpu_hotplug(void) | |
4353 | { | |
4354 | } | |
5f4c791e | 4355 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4356 | |
a90917c3 | 4357 | static int __init lttng_events_init(void) |
4e3c1b9b | 4358 | { |
1c25284c MD |
4359 | int ret; |
4360 | ||
453b2495 JD |
4361 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4362 | if (ret) | |
4363 | return ret; | |
389d7070 | 4364 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4365 | if (ret) |
4366 | return ret; | |
4367 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4368 | if (ret) |
4369 | return ret; | |
4370 | ret = lttng_probes_init(); | |
389d7070 MD |
4371 | if (ret) |
4372 | return ret; | |
07dfc1d0 | 4373 | ret = lttng_context_init(); |
20591cf7 MD |
4374 | if (ret) |
4375 | return ret; | |
07dfc1d0 MD |
4376 | ret = lttng_tracepoint_init(); |
4377 | if (ret) | |
4378 | goto error_tp; | |
a67ba386 MD |
4379 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4380 | if (!event_recorder_cache) { | |
20591cf7 | 4381 | ret = -ENOMEM; |
a67ba386 | 4382 | goto error_kmem_event_recorder; |
dffef45d | 4383 | } |
a67ba386 MD |
4384 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4385 | if (!event_recorder_private_cache) { | |
4386 | ret = -ENOMEM; | |
4387 | goto error_kmem_event_recorder_private; | |
4388 | } | |
4389 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4390 | if (!event_notifier_cache) { |
4391 | ret = -ENOMEM; | |
4392 | goto error_kmem_event_notifier; | |
20591cf7 | 4393 | } |
a67ba386 MD |
4394 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4395 | if (!event_notifier_private_cache) { | |
4396 | ret = -ENOMEM; | |
4397 | goto error_kmem_event_notifier_private; | |
4398 | } | |
80996790 | 4399 | ret = lttng_abi_init(); |
02119ee5 MD |
4400 | if (ret) |
4401 | goto error_abi; | |
0c956676 MD |
4402 | ret = lttng_logger_init(); |
4403 | if (ret) | |
4404 | goto error_logger; | |
1e367326 MD |
4405 | ret = lttng_init_cpu_hotplug(); |
4406 | if (ret) | |
4407 | goto error_hotplug; | |
101215b7 | 4408 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4409 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4410 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4411 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4412 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4413 | LTTNG_VERSION_NAME, |
4414 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4415 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4416 | #else | |
4417 | "", | |
4418 | #endif | |
4419 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4420 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4421 | #else | |
4422 | ""); | |
4423 | #endif | |
f73c5a43 MJ |
4424 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4425 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4426 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4427 | return 0; |
0c956676 | 4428 | |
1e367326 MD |
4429 | error_hotplug: |
4430 | lttng_logger_exit(); | |
0c956676 MD |
4431 | error_logger: |
4432 | lttng_abi_exit(); | |
02119ee5 | 4433 | error_abi: |
a67ba386 MD |
4434 | kmem_cache_destroy(event_notifier_private_cache); |
4435 | error_kmem_event_notifier_private: | |
dffef45d FD |
4436 | kmem_cache_destroy(event_notifier_cache); |
4437 | error_kmem_event_notifier: | |
a67ba386 MD |
4438 | kmem_cache_destroy(event_recorder_private_cache); |
4439 | error_kmem_event_recorder_private: | |
4440 | kmem_cache_destroy(event_recorder_cache); | |
4441 | error_kmem_event_recorder: | |
20591cf7 | 4442 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4443 | error_tp: |
4444 | lttng_context_exit(); | |
101215b7 | 4445 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4446 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4447 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4448 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4449 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4450 | LTTNG_VERSION_NAME, |
4451 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4452 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4453 | #else | |
4454 | "", | |
4455 | #endif | |
4456 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4457 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4458 | #else | |
4459 | ""); | |
4460 | #endif | |
1c25284c | 4461 | return ret; |
4e3c1b9b MD |
4462 | } |
4463 | ||
a90917c3 | 4464 | module_init(lttng_events_init); |
11b5a3c2 | 4465 | |
a90917c3 | 4466 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4467 | { |
a40e3229 | 4468 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4469 | |
1e367326 | 4470 | lttng_exit_cpu_hotplug(); |
0c956676 | 4471 | lttng_logger_exit(); |
80996790 | 4472 | lttng_abi_exit(); |
a40e3229 MD |
4473 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4474 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4475 | kmem_cache_destroy(event_recorder_cache); |
4476 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4477 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4478 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4479 | lttng_tracepoint_exit(); |
07dfc1d0 | 4480 | lttng_context_exit(); |
101215b7 | 4481 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4482 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4483 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4484 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4485 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4486 | LTTNG_VERSION_NAME, |
4487 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4488 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4489 | #else | |
4490 | "", | |
4491 | #endif | |
4492 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4493 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4494 | #else | |
4495 | ""); | |
4496 | #endif | |
4e3c1b9b | 4497 | } |
92e94819 | 4498 | |
a90917c3 | 4499 | module_exit(lttng_events_exit); |
11b5a3c2 | 4500 | |
7ca11e77 | 4501 | #include <generated/patches.h> |
101215b7 MJ |
4502 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4503 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4504 | #endif | |
4505 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4506 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4507 | #endif | |
92e94819 MD |
4508 | MODULE_LICENSE("GPL and additional rights"); |
4509 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4510 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4511 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4512 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4513 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4514 | LTTNG_MODULES_EXTRAVERSION); |