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 | ||
57e629fa | 1720 | static |
a2fa977a | 1721 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1722 | enum tracker_type tracker_type) |
e0130fab | 1723 | { |
d1f652f8 MD |
1724 | switch (tracker_type) { |
1725 | case TRACKER_PID: | |
1726 | return &session->pid_tracker; | |
1727 | case TRACKER_VPID: | |
1728 | return &session->vpid_tracker; | |
1729 | case TRACKER_UID: | |
1730 | return &session->uid_tracker; | |
1731 | case TRACKER_VUID: | |
1732 | return &session->vuid_tracker; | |
1733 | case TRACKER_GID: | |
1734 | return &session->gid_tracker; | |
1735 | case TRACKER_VGID: | |
1736 | return &session->vgid_tracker; | |
1737 | default: | |
1738 | WARN_ON_ONCE(1); | |
1739 | return NULL; | |
1740 | } | |
1741 | } | |
1742 | ||
a40e3229 | 1743 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1744 | enum tracker_type tracker_type, int id) |
1745 | { | |
a2fa977a | 1746 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1747 | int ret; |
1748 | ||
d1f652f8 MD |
1749 | tracker = get_tracker(session, tracker_type); |
1750 | if (!tracker) | |
1751 | return -EINVAL; | |
1752 | if (id < -1) | |
e0130fab MD |
1753 | return -EINVAL; |
1754 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1755 | if (id == -1) { |
1756 | /* track all ids: destroy tracker. */ | |
1757 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1758 | ret = 0; |
1759 | } else { | |
d1f652f8 | 1760 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1761 | } |
e0130fab MD |
1762 | mutex_unlock(&sessions_mutex); |
1763 | return ret; | |
1764 | } | |
1765 | ||
a40e3229 | 1766 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1767 | enum tracker_type tracker_type, int id) |
e0130fab | 1768 | { |
a2fa977a | 1769 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1770 | int ret; |
1771 | ||
d1f652f8 MD |
1772 | tracker = get_tracker(session, tracker_type); |
1773 | if (!tracker) | |
1774 | return -EINVAL; | |
1775 | if (id < -1) | |
e0130fab MD |
1776 | return -EINVAL; |
1777 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1778 | if (id == -1) { |
1779 | /* untrack all ids: replace by empty tracker. */ | |
1780 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1781 | } else { |
d1f652f8 | 1782 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1783 | } |
e0130fab MD |
1784 | mutex_unlock(&sessions_mutex); |
1785 | return ret; | |
1786 | } | |
1787 | ||
7e6f9ef6 | 1788 | static |
d1f652f8 | 1789 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1790 | { |
a2fa977a MD |
1791 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1792 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1793 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1794 | int iter = 0, i; |
1795 | ||
1796 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1797 | if (id_tracker_p) { |
1798 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1799 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1800 | |
f934e302 | 1801 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1802 | if (iter++ >= *pos) |
1803 | return e; | |
1804 | } | |
1805 | } | |
1806 | } else { | |
d1f652f8 | 1807 | /* ID tracker disabled. */ |
7e6f9ef6 | 1808 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1809 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1810 | } |
1811 | iter++; | |
1812 | } | |
1813 | /* End of list */ | |
1814 | return NULL; | |
1815 | } | |
1816 | ||
1817 | /* Called with sessions_mutex held. */ | |
1818 | static | |
d1f652f8 | 1819 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1820 | { |
a2fa977a MD |
1821 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1822 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1823 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1824 | int iter = 0, i; |
1825 | ||
1826 | (*ppos)++; | |
d1f652f8 MD |
1827 | if (id_tracker_p) { |
1828 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1829 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1830 | |
f934e302 | 1831 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1832 | if (iter++ >= *ppos) |
1833 | return e; | |
1834 | } | |
1835 | } | |
1836 | } else { | |
d1f652f8 | 1837 | /* ID tracker disabled. */ |
7e6f9ef6 | 1838 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1839 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1840 | iter++; |
1841 | } | |
1842 | ||
1843 | /* End of list */ | |
1844 | return NULL; | |
1845 | } | |
1846 | ||
1847 | static | |
d1f652f8 | 1848 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1849 | { |
1850 | mutex_unlock(&sessions_mutex); | |
1851 | } | |
1852 | ||
1853 | static | |
d1f652f8 | 1854 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1855 | { |
a2fa977a MD |
1856 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1857 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1858 | int id; |
7e6f9ef6 | 1859 | |
d1f652f8 | 1860 | if (p == id_tracker_p) { |
7e6f9ef6 | 1861 | /* Tracker disabled. */ |
d1f652f8 | 1862 | id = -1; |
7e6f9ef6 | 1863 | } else { |
d1f652f8 | 1864 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1865 | |
d1f652f8 MD |
1866 | id = lttng_id_tracker_get_node_id(e); |
1867 | } | |
a2fa977a | 1868 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1869 | case TRACKER_PID: |
1870 | seq_printf(m, "process { pid = %d; };\n", id); | |
1871 | break; | |
1872 | case TRACKER_VPID: | |
1873 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1874 | break; | |
1875 | case TRACKER_UID: | |
1876 | seq_printf(m, "user { uid = %d; };\n", id); | |
1877 | break; | |
1878 | case TRACKER_VUID: | |
1879 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1880 | break; | |
1881 | case TRACKER_GID: | |
1882 | seq_printf(m, "group { gid = %d; };\n", id); | |
1883 | break; | |
1884 | case TRACKER_VGID: | |
1885 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1886 | break; | |
1887 | default: | |
1888 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1889 | } |
7e6f9ef6 MD |
1890 | return 0; |
1891 | } | |
1892 | ||
1893 | static | |
d1f652f8 MD |
1894 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1895 | .start = id_list_start, | |
1896 | .next = id_list_next, | |
1897 | .stop = id_list_stop, | |
1898 | .show = id_list_show, | |
7e6f9ef6 MD |
1899 | }; |
1900 | ||
1901 | static | |
d1f652f8 | 1902 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1903 | { |
d1f652f8 | 1904 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1905 | } |
1906 | ||
1907 | static | |
d1f652f8 | 1908 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1909 | { |
1910 | struct seq_file *m = file->private_data; | |
a2fa977a | 1911 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1912 | int ret; |
1913 | ||
d1f652f8 | 1914 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1915 | ret = seq_release(inode, file); |
d1f652f8 | 1916 | if (!ret) |
a2fa977a | 1917 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1918 | return ret; |
1919 | } | |
1920 | ||
d1f652f8 | 1921 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1922 | .owner = THIS_MODULE, |
d1f652f8 | 1923 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1924 | .read = seq_read, |
1925 | .llseek = seq_lseek, | |
d1f652f8 | 1926 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1927 | }; |
1928 | ||
a40e3229 | 1929 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1930 | enum tracker_type tracker_type) |
7e6f9ef6 | 1931 | { |
d1f652f8 | 1932 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1933 | struct seq_file *m; |
1934 | int file_fd, ret; | |
1935 | ||
1936 | file_fd = lttng_get_unused_fd(); | |
1937 | if (file_fd < 0) { | |
1938 | ret = file_fd; | |
1939 | goto fd_error; | |
1940 | } | |
1941 | ||
d1f652f8 MD |
1942 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1943 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1944 | NULL, O_RDWR); |
d1f652f8 MD |
1945 | if (IS_ERR(tracker_ids_list_file)) { |
1946 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1947 | goto file_error; |
1948 | } | |
a40e3229 | 1949 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1950 | ret = -EOVERFLOW; |
9c1f4643 MD |
1951 | goto refcount_error; |
1952 | } | |
d1f652f8 | 1953 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1954 | if (ret < 0) |
1955 | goto open_error; | |
d1f652f8 MD |
1956 | m = tracker_ids_list_file->private_data; |
1957 | ||
1958 | m->private = get_tracker(session, tracker_type); | |
1959 | BUG_ON(!m->private); | |
1960 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1961 | |
1962 | return file_fd; | |
1963 | ||
1964 | open_error: | |
a40e3229 | 1965 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1966 | refcount_error: |
d1f652f8 | 1967 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1968 | file_error: |
1969 | put_unused_fd(file_fd); | |
1970 | fd_error: | |
1971 | return ret; | |
1972 | } | |
1973 | ||
3c997079 MD |
1974 | /* |
1975 | * Enabler management. | |
1976 | */ | |
1977 | static | |
4993071a PP |
1978 | int lttng_match_enabler_star_glob(const char *desc_name, |
1979 | const char *pattern) | |
3c997079 | 1980 | { |
cbc19040 MD |
1981 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1982 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1983 | return 0; |
1984 | return 1; | |
1985 | } | |
1986 | ||
1987 | static | |
4ecb5ad5 MD |
1988 | int lttng_match_enabler_name(const char *desc_name, |
1989 | const char *name) | |
3c997079 | 1990 | { |
4ecb5ad5 | 1991 | if (strcmp(desc_name, name)) |
3c997079 MD |
1992 | return 0; |
1993 | return 1; | |
1994 | } | |
1995 | ||
437d5aa5 | 1996 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
3c997079 MD |
1997 | struct lttng_enabler *enabler) |
1998 | { | |
4ecb5ad5 | 1999 | const char *desc_name, *enabler_name; |
badfe9f5 | 2000 | bool compat = false, entry = false; |
4ecb5ad5 MD |
2001 | |
2002 | enabler_name = enabler->event_param.name; | |
2003 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 2004 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 2005 | desc_name = desc->event_name; |
3b861b22 FD |
2006 | switch (enabler->format_type) { |
2007 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2008 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2009 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2010 | return lttng_match_enabler_name(desc_name, enabler_name); |
2011 | default: | |
2012 | return -EINVAL; | |
2013 | } | |
4ecb5ad5 | 2014 | break; |
b4a75708 | 2015 | |
606828e4 | 2016 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 2017 | desc_name = desc->event_name; |
badfe9f5 | 2018 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 2019 | desc_name += strlen("compat_"); |
badfe9f5 MD |
2020 | compat = true; |
2021 | } | |
4ecb5ad5 MD |
2022 | if (!strncmp(desc_name, "syscall_exit_", |
2023 | strlen("syscall_exit_"))) { | |
2024 | desc_name += strlen("syscall_exit_"); | |
2025 | } else if (!strncmp(desc_name, "syscall_entry_", | |
2026 | strlen("syscall_entry_"))) { | |
2027 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 2028 | entry = true; |
4ecb5ad5 MD |
2029 | } else { |
2030 | WARN_ON_ONCE(1); | |
2031 | return -EINVAL; | |
2032 | } | |
badfe9f5 | 2033 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 2034 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 2035 | break; |
606828e4 | 2036 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
2037 | if (!entry) |
2038 | return 0; | |
2039 | break; | |
606828e4 | 2040 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
2041 | if (entry) |
2042 | return 0; | |
2043 | break; | |
2044 | default: | |
2045 | return -EINVAL; | |
2046 | } | |
2047 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 2048 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 2049 | break; |
606828e4 | 2050 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
2051 | if (compat) |
2052 | return 0; | |
2053 | break; | |
606828e4 | 2054 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
2055 | if (!compat) |
2056 | return 0; | |
2057 | break; | |
2058 | default: | |
2059 | return -EINVAL; | |
2060 | } | |
2061 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2062 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2063 | switch (enabler->format_type) { |
2064 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2065 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2066 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2067 | return lttng_match_enabler_name(desc_name, enabler_name); |
2068 | default: | |
2069 | return -EINVAL; | |
2070 | } | |
2071 | break; | |
606828e4 | 2072 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2073 | return -EINVAL; /* Not implemented. */ |
2074 | default: | |
2075 | return -EINVAL; | |
2076 | } | |
4ecb5ad5 | 2077 | break; |
b4a75708 | 2078 | |
4ecb5ad5 MD |
2079 | default: |
2080 | WARN_ON_ONCE(1); | |
2081 | return -EINVAL; | |
2082 | } | |
3c997079 MD |
2083 | } |
2084 | ||
2085 | static | |
b2bc0bc8 | 2086 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
a67ba386 | 2087 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2088 | { |
b2bc0bc8 FD |
2089 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
2090 | event_enabler); | |
2091 | ||
a67ba386 | 2092 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2093 | return 0; |
a67ba386 MD |
2094 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2095 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2096 | return 1; |
2097 | else | |
2098 | return 0; | |
2099 | } | |
2100 | ||
b01155ba FD |
2101 | static |
2102 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2103 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba FD |
2104 | { |
2105 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
2106 | event_notifier_enabler); | |
2107 | ||
a67ba386 | 2108 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2109 | return 0; |
a67ba386 MD |
2110 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2111 | && event_notifier->priv->group == event_notifier_enabler->group | |
2112 | && event_notifier->priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2113 | return 1; |
2114 | else | |
2115 | return 0; | |
2116 | } | |
2117 | ||
3c997079 | 2118 | static |
b2bc0bc8 FD |
2119 | struct lttng_enabler_ref *lttng_enabler_ref( |
2120 | struct list_head *enablers_ref_list, | |
3c997079 MD |
2121 | struct lttng_enabler *enabler) |
2122 | { | |
2123 | struct lttng_enabler_ref *enabler_ref; | |
2124 | ||
b2bc0bc8 | 2125 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2126 | if (enabler_ref->ref == enabler) |
2127 | return enabler_ref; | |
2128 | } | |
2129 | return NULL; | |
2130 | } | |
2131 | ||
3c997079 | 2132 | static |
1b917d6b | 2133 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 2134 | { |
ac847066 | 2135 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; |
437d5aa5 MD |
2136 | struct lttng_kernel_probe_desc *probe_desc; |
2137 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2138 | int i; |
2139 | struct list_head *probe_list; | |
2140 | ||
2141 | probe_list = lttng_get_probe_list_head(); | |
2142 | /* | |
2143 | * For each probe event, if we find that a probe event matches | |
2144 | * our enabler, create an associated lttng_event if not | |
2145 | * already present. | |
2146 | */ | |
2147 | list_for_each_entry(probe_desc, probe_list, head) { | |
2148 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2149 | int found = 0; | |
2150 | struct hlist_head *head; | |
a67ba386 MD |
2151 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2152 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2153 | |
2154 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
2155 | if (!lttng_desc_match_enabler(desc, |
2156 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 2157 | continue; |
3c997079 MD |
2158 | |
2159 | /* | |
2160 | * Check if already created. | |
2161 | */ | |
4a11ef1c | 2162 | head = utils_borrow_hash_table_bucket( |
a40e3229 | 2163 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 2164 | desc->event_name); |
a67ba386 MD |
2165 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2166 | if (event_recorder_private->parent.desc == desc | |
2167 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2168 | found = 1; |
2169 | } | |
2170 | if (found) | |
2171 | continue; | |
2172 | ||
2173 | /* | |
2174 | * We need to create an event for this | |
2175 | * event probe. | |
2176 | */ | |
a67ba386 MD |
2177 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler->chan, |
2178 | NULL, desc, LTTNG_KERNEL_ABI_TRACEPOINT); | |
2179 | if (!event_recorder) { | |
5a15f70c | 2180 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2181 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2182 | } |
2183 | } | |
2184 | } | |
2185 | } | |
2186 | ||
b01155ba FD |
2187 | static |
2188 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2189 | { | |
2190 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2191 | struct lttng_kernel_probe_desc *probe_desc; |
2192 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2193 | int i; |
2194 | struct list_head *probe_list; | |
2195 | ||
2196 | probe_list = lttng_get_probe_list_head(); | |
2197 | /* | |
2198 | * For each probe event, if we find that a probe event matches | |
2199 | * our enabler, create an associated lttng_event_notifier if not | |
2200 | * already present. | |
2201 | */ | |
2202 | list_for_each_entry(probe_desc, probe_list, head) { | |
2203 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2204 | int found = 0; | |
2205 | struct hlist_head *head; | |
a67ba386 MD |
2206 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2207 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2208 | |
2209 | desc = probe_desc->event_desc[i]; | |
2210 | if (!lttng_desc_match_enabler(desc, | |
2211 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2212 | continue; | |
2213 | ||
2214 | /* | |
2215 | * Check if already created. | |
2216 | */ | |
2217 | head = utils_borrow_hash_table_bucket( | |
2218 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2219 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2220 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2221 | if (event_notifier_priv->parent.desc == desc | |
2222 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
b01155ba FD |
2223 | found = 1; |
2224 | } | |
2225 | if (found) | |
2226 | continue; | |
2227 | ||
2228 | /* | |
2229 | * We need to create a event_notifier for this event probe. | |
2230 | */ | |
2231 | event_notifier = _lttng_event_notifier_create(desc, | |
2232 | event_notifier_enabler->base.user_token, | |
99f52fcc | 2233 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2234 | event_notifier_group, NULL, |
606828e4 | 2235 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2236 | if (IS_ERR(event_notifier)) { |
2237 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2238 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2239 | } |
2240 | } | |
2241 | } | |
2242 | } | |
2243 | ||
33a39a3c | 2244 | static |
1b917d6b | 2245 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
2246 | { |
2247 | int ret; | |
2248 | ||
a67ba386 | 2249 | ret = lttng_syscalls_register_event(event_enabler); |
33a39a3c MD |
2250 | WARN_ON_ONCE(ret); |
2251 | } | |
2252 | ||
8a8ac9a8 FD |
2253 | static |
2254 | void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2255 | { | |
2256 | int ret; | |
2257 | ||
a67ba386 | 2258 | ret = lttng_syscalls_register_event_notifier(event_notifier_enabler); |
8a8ac9a8 | 2259 | WARN_ON_ONCE(ret); |
a67ba386 | 2260 | ret = lttng_syscalls_create_matching_event_notifiers(event_notifier_enabler); |
8a8ac9a8 FD |
2261 | WARN_ON_ONCE(ret); |
2262 | } | |
2263 | ||
33a39a3c | 2264 | /* |
a67ba386 | 2265 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2266 | * tracepoint probes. |
2267 | * Should be called with sessions mutex held. | |
2268 | */ | |
2269 | static | |
b2bc0bc8 | 2270 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 2271 | { |
b2bc0bc8 | 2272 | switch (event_enabler->base.event_param.instrumentation) { |
606828e4 | 2273 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2274 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2275 | break; |
b4a75708 | 2276 | |
606828e4 | 2277 | case LTTNG_KERNEL_ABI_SYSCALL: |
1b917d6b | 2278 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2279 | break; |
b4a75708 | 2280 | |
33a39a3c MD |
2281 | default: |
2282 | WARN_ON_ONCE(1); | |
2283 | break; | |
2284 | } | |
2285 | } | |
2286 | ||
3c997079 | 2287 | /* |
b2bc0bc8 | 2288 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2289 | * and add backward reference from the event to the enabler. |
2290 | * Should be called with sessions mutex held. | |
2291 | */ | |
2292 | static | |
b2bc0bc8 | 2293 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 2294 | { |
ac847066 MD |
2295 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
2296 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; | |
b2bc0bc8 | 2297 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); |
a67ba386 | 2298 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2299 | |
606828e4 MD |
2300 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2301 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2302 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2303 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2304 | int enabled = base_enabler->enabled; |
606828e4 | 2305 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2306 | |
606828e4 | 2307 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
ac847066 | 2308 | WRITE_ONCE(chan->priv->parent.syscall_all_entry, enabled); |
3b82c4e1 | 2309 | |
606828e4 | 2310 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
ac847066 | 2311 | WRITE_ONCE(chan->priv->parent.syscall_all_exit, enabled); |
badfe9f5 MD |
2312 | } |
2313 | ||
3c997079 | 2314 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2315 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2316 | |
b2bc0bc8 | 2317 | /* For each event matching event_enabler in session event list. */ |
a40e3229 | 2318 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2319 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2320 | struct lttng_enabler_ref *enabler_ref; |
2321 | ||
a67ba386 | 2322 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2323 | continue; |
a67ba386 | 2324 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
b2bc0bc8 | 2325 | lttng_event_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2326 | if (!enabler_ref) { |
2327 | /* | |
2328 | * If no backward ref, create it. | |
b2bc0bc8 | 2329 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2330 | */ |
2331 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2332 | if (!enabler_ref) | |
2333 | return -ENOMEM; | |
b2bc0bc8 | 2334 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 | 2335 | list_add(&enabler_ref->node, |
a67ba386 | 2336 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2337 | } |
2338 | ||
f127e61e MD |
2339 | /* |
2340 | * Link filter bytecodes if not linked yet. | |
2341 | */ | |
a67ba386 | 2342 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2343 | lttng_static_ctx, |
a67ba386 | 2344 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
60206944 | 2345 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2346 | } |
2347 | return 0; | |
2348 | } | |
2349 | ||
b01155ba | 2350 | /* |
a67ba386 | 2351 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2352 | * tracepoint probes. |
2353 | * Should be called with sessions mutex held. | |
2354 | */ | |
2355 | static | |
2356 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2357 | { | |
2358 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
606828e4 | 2359 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2360 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2361 | break; | |
b4a75708 | 2362 | |
606828e4 | 2363 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
2364 | lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler); |
2365 | break; | |
b4a75708 | 2366 | |
b01155ba FD |
2367 | default: |
2368 | WARN_ON_ONCE(1); | |
2369 | break; | |
2370 | } | |
2371 | } | |
2372 | ||
2373 | /* | |
2374 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2375 | */ | |
2376 | static | |
8a8ac9a8 FD |
2377 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2378 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2379 | { |
2380 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8a8ac9a8 | 2381 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2382 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2383 | |
606828e4 MD |
2384 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2385 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2386 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2387 | !strcmp(base_enabler->event_param.name, "*")) { |
2388 | ||
2389 | int enabled = base_enabler->enabled; | |
606828e4 | 2390 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2391 | |
606828e4 | 2392 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2393 | WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled); |
2394 | ||
606828e4 | 2395 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
8a8ac9a8 FD |
2396 | WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled); |
2397 | ||
2398 | } | |
2399 | ||
b01155ba FD |
2400 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2401 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2402 | ||
2403 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2404 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2405 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2406 | struct lttng_enabler_ref *enabler_ref; |
2407 | ||
2408 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2409 | continue; | |
2410 | ||
a67ba386 | 2411 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2412 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2413 | if (!enabler_ref) { | |
2414 | /* | |
2415 | * If no backward ref, create it. | |
2416 | * Add backward ref from event_notifier to enabler. | |
2417 | */ | |
2418 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2419 | if (!enabler_ref) | |
2420 | return -ENOMEM; | |
2421 | ||
2422 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2423 | event_notifier_enabler); | |
2424 | list_add(&enabler_ref->node, | |
a67ba386 | 2425 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2426 | } |
2427 | ||
2428 | /* | |
2429 | * Link filter bytecodes if not linked yet. | |
2430 | */ | |
a67ba386 MD |
2431 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2432 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2433 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2434 | |
2435 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2436 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2437 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2438 | &event_notifier_enabler->capture_bytecode_head); |
2439 | ||
a67ba386 | 2440 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2441 | } |
2442 | return 0; | |
2443 | } | |
2444 | ||
3c997079 MD |
2445 | /* |
2446 | * Called at module load: connect the probe on all enablers matching | |
2447 | * this event. | |
2448 | * Called with sessions lock held. | |
2449 | */ | |
2450 | int lttng_fix_pending_events(void) | |
2451 | { | |
a40e3229 | 2452 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2453 | |
a40e3229 MD |
2454 | list_for_each_entry(session_priv, &sessions, list) |
2455 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2456 | return 0; |
2457 | } | |
2458 | ||
b01155ba FD |
2459 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2460 | struct lttng_event_notifier_group *event_notifier_group) | |
2461 | { | |
2462 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2463 | ||
2464 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2465 | node) { | |
2466 | if (event_notifier_enabler->base.enabled) | |
2467 | return true; | |
2468 | } | |
2469 | return false; | |
2470 | } | |
2471 | ||
2472 | bool lttng_event_notifier_active(void) | |
2473 | { | |
2474 | struct lttng_event_notifier_group *event_notifier_group; | |
2475 | ||
2476 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2477 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2478 | return true; | |
2479 | } | |
2480 | return false; | |
2481 | } | |
2482 | ||
2483 | int lttng_fix_pending_event_notifiers(void) | |
2484 | { | |
2485 | struct lttng_event_notifier_group *event_notifier_group; | |
2486 | ||
2487 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2488 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2489 | return 0; | |
2490 | } | |
2491 | ||
b2bc0bc8 FD |
2492 | struct lttng_event_enabler *lttng_event_enabler_create( |
2493 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2494 | struct lttng_kernel_abi_event *event_param, |
ac847066 | 2495 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2496 | { |
b2bc0bc8 | 2497 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2498 | |
b2bc0bc8 FD |
2499 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2500 | if (!event_enabler) | |
3c997079 | 2501 | return NULL; |
b2bc0bc8 FD |
2502 | event_enabler->base.format_type = format_type; |
2503 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2504 | memcpy(&event_enabler->base.event_param, event_param, | |
2505 | sizeof(event_enabler->base.event_param)); | |
2506 | event_enabler->chan = chan; | |
3c997079 | 2507 | /* ctx left NULL */ |
b2bc0bc8 | 2508 | event_enabler->base.enabled = 0; |
3c997079 | 2509 | mutex_lock(&sessions_mutex); |
ac847066 MD |
2510 | list_add(&event_enabler->node, &event_enabler->chan->parent.session->priv->enablers_head); |
2511 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); | |
3c997079 | 2512 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2513 | return event_enabler; |
3c997079 MD |
2514 | } |
2515 | ||
b2bc0bc8 | 2516 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2517 | { |
2518 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2519 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
ac847066 | 2520 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2521 | mutex_unlock(&sessions_mutex); |
2522 | return 0; | |
2523 | } | |
2524 | ||
b2bc0bc8 | 2525 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2526 | { |
2527 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 | 2528 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
ac847066 | 2529 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
3c997079 MD |
2530 | mutex_unlock(&sessions_mutex); |
2531 | return 0; | |
2532 | } | |
2533 | ||
b2bc0bc8 | 2534 | static |
183e8b3a | 2535 | int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
606828e4 | 2536 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2537 | { |
9906b046 | 2538 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2539 | uint32_t bytecode_len; |
2540 | int ret; | |
2541 | ||
2542 | ret = get_user(bytecode_len, &bytecode->len); | |
2543 | if (ret) | |
2544 | return ret; | |
52cfcdf3 | 2545 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2546 | GFP_KERNEL); |
2547 | if (!bytecode_node) | |
2548 | return -ENOMEM; | |
2549 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2550 | sizeof(*bytecode) + bytecode_len); | |
2551 | if (ret) | |
2552 | goto error_free; | |
b2bc0bc8 | 2553 | |
8a445457 | 2554 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2555 | bytecode_node->enabler = enabler; |
2556 | /* Enforce length based on allocated size */ | |
2557 | bytecode_node->bc.len = bytecode_len; | |
2558 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2559 | |
07dfc1d0 MD |
2560 | return 0; |
2561 | ||
2562 | error_free: | |
52cfcdf3 | 2563 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2564 | return ret; |
2565 | } | |
2566 | ||
183e8b3a | 2567 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
606828e4 | 2568 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2569 | { |
2570 | int ret; | |
183e8b3a | 2571 | ret = lttng_enabler_attach_filter_bytecode( |
b2bc0bc8 FD |
2572 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
2573 | if (ret) | |
2574 | goto error; | |
2575 | ||
ac847066 | 2576 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent.session); |
b2bc0bc8 FD |
2577 | return 0; |
2578 | ||
2579 | error: | |
2580 | return ret; | |
2581 | } | |
2582 | ||
e2d5dbc7 | 2583 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2584 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2585 | { |
2586 | ||
e2d5dbc7 | 2587 | switch (event->priv->instrumentation) { |
606828e4 | 2588 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2589 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2590 | default: |
2591 | return -EINVAL; | |
2592 | } | |
2593 | } | |
2594 | ||
3c997079 MD |
2595 | static |
2596 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2597 | { | |
9906b046 | 2598 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2599 | |
2600 | /* Destroy filter bytecode */ | |
2601 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2602 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2603 | lttng_kvfree(filter_node); |
07dfc1d0 | 2604 | } |
b2bc0bc8 FD |
2605 | } |
2606 | ||
2607 | static | |
2608 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2609 | { | |
2610 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2611 | |
b2bc0bc8 FD |
2612 | list_del(&event_enabler->node); |
2613 | kfree(event_enabler); | |
3c997079 MD |
2614 | } |
2615 | ||
dffef45d FD |
2616 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2617 | struct lttng_event_notifier_group *event_notifier_group, | |
2618 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2619 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2620 | { |
2621 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2622 | ||
2623 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2624 | if (!event_notifier_enabler) | |
2625 | return NULL; | |
2626 | ||
2627 | event_notifier_enabler->base.format_type = format_type; | |
2628 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
99d223ad FD |
2629 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2630 | ||
99f52fcc | 2631 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2632 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2633 | |
8a8ac9a8 FD |
2634 | memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event, |
2635 | sizeof(event_notifier_enabler->base.event_param)); | |
dffef45d FD |
2636 | |
2637 | event_notifier_enabler->base.enabled = 0; | |
2638 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2639 | event_notifier_enabler->group = event_notifier_group; | |
2640 | ||
2641 | mutex_lock(&sessions_mutex); | |
2642 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2643 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2644 | |
2645 | mutex_unlock(&sessions_mutex); | |
2646 | ||
2647 | return event_notifier_enabler; | |
2648 | } | |
2649 | ||
2650 | int lttng_event_notifier_enabler_enable( | |
2651 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2652 | { | |
2653 | mutex_lock(&sessions_mutex); | |
2654 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2655 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2656 | mutex_unlock(&sessions_mutex); |
2657 | return 0; | |
2658 | } | |
2659 | ||
2660 | int lttng_event_notifier_enabler_disable( | |
2661 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2662 | { | |
2663 | mutex_lock(&sessions_mutex); | |
2664 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2665 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2666 | mutex_unlock(&sessions_mutex); |
2667 | return 0; | |
2668 | } | |
2669 | ||
183e8b3a | 2670 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
dffef45d | 2671 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
606828e4 | 2672 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
dffef45d FD |
2673 | { |
2674 | int ret; | |
2675 | ||
183e8b3a | 2676 | ret = lttng_enabler_attach_filter_bytecode( |
dffef45d FD |
2677 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
2678 | bytecode); | |
2679 | if (ret) | |
2680 | goto error; | |
2681 | ||
b01155ba | 2682 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2683 | return 0; |
2684 | ||
2685 | error: | |
2686 | return ret; | |
2687 | } | |
2688 | ||
99d223ad FD |
2689 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2690 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2691 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2692 | { |
9906b046 | 2693 | struct lttng_kernel_bytecode_node *bytecode_node; |
99d223ad FD |
2694 | struct lttng_enabler *enabler = |
2695 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
2696 | uint32_t bytecode_len; | |
2697 | int ret; | |
2698 | ||
2699 | ret = get_user(bytecode_len, &bytecode->len); | |
2700 | if (ret) | |
2701 | return ret; | |
2702 | ||
2703 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2704 | GFP_KERNEL); | |
2705 | if (!bytecode_node) | |
2706 | return -ENOMEM; | |
2707 | ||
2708 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2709 | sizeof(*bytecode) + bytecode_len); | |
2710 | if (ret) | |
2711 | goto error_free; | |
2712 | ||
8a445457 | 2713 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2714 | bytecode_node->enabler = enabler; |
2715 | ||
2716 | /* Enforce length based on allocated size */ | |
2717 | bytecode_node->bc.len = bytecode_len; | |
2718 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2719 | ||
2720 | event_notifier_enabler->num_captures++; | |
2721 | ||
2722 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2723 | goto end; | |
2724 | ||
2725 | error_free: | |
2726 | lttng_kvfree(bytecode_node); | |
2727 | end: | |
2728 | return ret; | |
2729 | } | |
2730 | ||
dffef45d FD |
2731 | static |
2732 | void lttng_event_notifier_enabler_destroy( | |
2733 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2734 | { | |
2735 | if (!event_notifier_enabler) { | |
2736 | return; | |
2737 | } | |
2738 | ||
2739 | list_del(&event_notifier_enabler->node); | |
2740 | ||
2741 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2742 | kfree(event_notifier_enabler); | |
2743 | } | |
2744 | ||
3c997079 | 2745 | /* |
b2bc0bc8 | 2746 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2747 | * session. |
2748 | * Should be called with sessions mutex held. | |
2749 | */ | |
2750 | static | |
a40e3229 | 2751 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2752 | { |
b2bc0bc8 | 2753 | struct lttng_event_enabler *event_enabler; |
a67ba386 | 2754 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2755 | |
a40e3229 | 2756 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2757 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2758 | /* |
2759 | * For each event, if at least one of its enablers is enabled, | |
2760 | * and its channel and session transient states are enabled, we | |
2761 | * enable the event, else we disable it. | |
2762 | */ | |
a40e3229 | 2763 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2764 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2765 | struct lttng_enabler_ref *enabler_ref; |
dc7350d6 | 2766 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2767 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2768 | int nr_filters = 0; | |
3c997079 | 2769 | |
a67ba386 | 2770 | switch (event_recorder_priv->parent.instrumentation) { |
c570be0d MJ |
2771 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2772 | lttng_fallthrough; | |
606828e4 | 2773 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
2774 | /* Enable events */ |
2775 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2776 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2777 | if (enabler_ref->ref->enabled) { |
2778 | enabled = 1; | |
2779 | break; | |
2780 | } | |
2781 | } | |
4ecb5ad5 | 2782 | break; |
b4a75708 | 2783 | |
4ecb5ad5 | 2784 | default: |
3c997079 MD |
2785 | /* Not handled with lazy sync. */ |
2786 | continue; | |
2787 | } | |
2788 | /* | |
2789 | * Enabled state is based on union of enablers, with | |
2790 | * intesection of session and channel transient enable | |
2791 | * states. | |
2792 | */ | |
ac847066 | 2793 | enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; |
3c997079 | 2794 | |
a67ba386 | 2795 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2796 | /* |
2797 | * Sync tracepoint registration with event enabled | |
2798 | * state. | |
2799 | */ | |
2800 | if (enabled) { | |
38b35aff MD |
2801 | if (!event_recorder_priv->parent.registered) |
2802 | register_event(event_recorder); | |
3c997079 | 2803 | } else { |
38b35aff MD |
2804 | if (event_recorder_priv->parent.registered) |
2805 | _lttng_event_unregister(event_recorder); | |
3c997079 | 2806 | } |
07dfc1d0 MD |
2807 | |
2808 | /* Check if has enablers without bytecode enabled */ | |
2809 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2810 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2811 | if (enabler_ref->ref->enabled |
2812 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2813 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2814 | break; |
2815 | } | |
2816 | } | |
a67ba386 | 2817 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2818 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2819 | |
2820 | /* Enable filters */ | |
2821 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2822 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2823 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2824 | nr_filters++; |
2825 | } | |
2826 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2827 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2828 | } |
2829 | } | |
2830 | ||
2831 | /* | |
2832 | * Apply enablers to session events, adding events to session if need | |
2833 | * be. It is required after each modification applied to an active | |
2834 | * session, and right before session "start". | |
2835 | * "lazy" sync means we only sync if required. | |
2836 | * Should be called with sessions mutex held. | |
2837 | */ | |
2838 | static | |
a40e3229 | 2839 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2840 | { |
2841 | /* We can skip if session is not active */ | |
2842 | if (!session->active) | |
2843 | return; | |
b2bc0bc8 | 2844 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2845 | } |
2846 | ||
b01155ba FD |
2847 | static |
2848 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2849 | { | |
2850 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2851 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2852 | |
2853 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2854 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2855 | ||
2856 | /* | |
2857 | * For each event_notifier, if at least one of its enablers is enabled, | |
2858 | * we enable the event_notifier, else we disable it. | |
2859 | */ | |
a67ba386 MD |
2860 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2861 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2862 | struct lttng_enabler_ref *enabler_ref; |
dc7350d6 | 2863 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2864 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2865 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2866 | |
a67ba386 | 2867 | switch (event_notifier_priv->parent.instrumentation) { |
c570be0d MJ |
2868 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2869 | lttng_fallthrough; | |
606828e4 | 2870 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
2871 | /* Enable event_notifiers */ |
2872 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2873 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2874 | if (enabler_ref->ref->enabled) { |
2875 | enabled = 1; | |
2876 | break; | |
2877 | } | |
2878 | } | |
2879 | break; | |
b4a75708 | 2880 | |
b01155ba FD |
2881 | default: |
2882 | /* Not handled with sync. */ | |
2883 | continue; | |
2884 | } | |
2885 | ||
a67ba386 | 2886 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2887 | /* |
2888 | * Sync tracepoint registration with event_notifier enabled | |
2889 | * state. | |
2890 | */ | |
2891 | if (enabled) { | |
a67ba386 | 2892 | if (!event_notifier_priv->parent.registered) |
b01155ba FD |
2893 | register_event_notifier(event_notifier); |
2894 | } else { | |
a67ba386 | 2895 | if (event_notifier_priv->parent.registered) |
38b35aff | 2896 | unregister_event_notifier(event_notifier); |
b01155ba FD |
2897 | } |
2898 | ||
2899 | /* Check if has enablers without bytecode enabled */ | |
2900 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2901 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2902 | if (enabler_ref->ref->enabled |
2903 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2904 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2905 | break; |
2906 | } | |
2907 | } | |
a67ba386 | 2908 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2909 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2910 | |
2911 | /* Enable filters */ | |
2912 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2913 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2914 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2915 | nr_filters++; |
2916 | } | |
2917 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2918 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2919 | |
2920 | /* Enable captures */ | |
2921 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2922 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2923 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2924 | nr_captures++; |
2925 | } | |
2926 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2927 | } |
2928 | } | |
2929 | ||
1ec3f75a | 2930 | /* |
d83004aa JD |
2931 | * Serialize at most one packet worth of metadata into a metadata |
2932 | * channel. | |
92d9f5e6 MD |
2933 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2934 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2935 | * allows us to do racy operations such as looking for remaining space left in | |
2936 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2937 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2938 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2939 | * Returns the number of bytes written in the channel, 0 if no data |
2940 | * was written and a negative value on error. | |
1ec3f75a | 2941 | */ |
b3b8072b | 2942 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
4071a628 | 2943 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2944 | { |
e27e4381 | 2945 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2946 | int ret = 0; |
2947 | size_t len, reserve_len; | |
2948 | ||
f613e3e6 | 2949 | /* |
92d9f5e6 MD |
2950 | * Ensure we support mutiple get_next / put sequences followed by |
2951 | * put_next. The metadata cache lock protects reading the metadata | |
2952 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2953 | * "flush" operations on the buffer invoked by different processes. | |
2954 | * Moreover, since the metadata cache memory can be reallocated, we | |
2955 | * need to have exclusive access against updates even though we only | |
2956 | * read it. | |
f613e3e6 | 2957 | */ |
92d9f5e6 | 2958 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2959 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2960 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2961 | goto end; |
f613e3e6 | 2962 | |
9616f0bf JD |
2963 | /* Metadata regenerated, change the version. */ |
2964 | if (stream->metadata_cache->version != stream->version) | |
2965 | stream->version = stream->metadata_cache->version; | |
2966 | ||
d83004aa | 2967 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2968 | stream->metadata_in; |
9de2c215 | 2969 | if (!len) |
de23d59d | 2970 | goto end; |
d83004aa | 2971 | reserve_len = min_t(size_t, |
da1fe18f | 2972 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2973 | len); |
a775608d | 2974 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
c7d9db61 | 2975 | sizeof(char), NULL); |
d83004aa JD |
2976 | /* |
2977 | * If reservation failed, return an error to the caller. | |
2978 | */ | |
cefd899f | 2979 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2980 | if (ret != 0) { |
2981 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2982 | stream->coherent = false; |
d83004aa JD |
2983 | goto end; |
2984 | } | |
b3b8072b | 2985 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2986 | stream->metadata_cache->data + stream->metadata_in, |
77fcffef | 2987 | reserve_len, 1); |
b3b8072b | 2988 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2989 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2990 | if (reserve_len < len) |
8b97fd42 MD |
2991 | stream->coherent = false; |
2992 | else | |
2993 | stream->coherent = true; | |
d83004aa JD |
2994 | ret = reserve_len; |
2995 | ||
2996 | end: | |
8b97fd42 MD |
2997 | if (coherent) |
2998 | *coherent = stream->coherent; | |
92d9f5e6 | 2999 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
3000 | return ret; |
3001 | } | |
3002 | ||
8b97fd42 | 3003 | static |
a40e3229 | 3004 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 3005 | { |
a40e3229 MD |
3006 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
3007 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
3008 | } |
3009 | ||
3010 | static | |
a40e3229 | 3011 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 3012 | { |
a40e3229 MD |
3013 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3014 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
3015 | struct lttng_metadata_stream *stream; |
3016 | ||
a40e3229 | 3017 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 3018 | wake_up_interruptible(&stream->read_wait); |
a40e3229 | 3019 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 3020 | } |
8b97fd42 MD |
3021 | } |
3022 | ||
d83004aa JD |
3023 | /* |
3024 | * Write the metadata to the metadata cache. | |
3025 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
3026 | * The metadata cache lock protects us from concurrent read access from |
3027 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
3028 | * The content of the printf is printed as a single atomic metadata |
3029 | * transaction. | |
d83004aa | 3030 | */ |
57e629fa | 3031 | static |
a40e3229 | 3032 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
3033 | const char *fmt, ...) |
3034 | { | |
c099397a | 3035 | char *str; |
d83004aa | 3036 | size_t len; |
c099397a MD |
3037 | va_list ap; |
3038 | ||
585e5dcc | 3039 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
3040 | |
3041 | va_start(ap, fmt); | |
3042 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
3043 | va_end(ap); | |
3044 | if (!str) | |
3045 | return -ENOMEM; | |
3046 | ||
1ec3f75a | 3047 | len = strlen(str); |
a40e3229 MD |
3048 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3049 | if (session->priv->metadata_cache->metadata_written + len > | |
3050 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
3051 | char *tmp_cache_realloc; |
3052 | unsigned int tmp_cache_alloc_size; | |
3053 | ||
3054 | tmp_cache_alloc_size = max_t(unsigned int, | |
a40e3229 MD |
3055 | session->priv->metadata_cache->cache_alloc + len, |
3056 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 3057 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
3058 | if (!tmp_cache_realloc) |
3059 | goto err; | |
a40e3229 | 3060 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 3061 | memcpy(tmp_cache_realloc, |
a40e3229 MD |
3062 | session->priv->metadata_cache->data, |
3063 | session->priv->metadata_cache->cache_alloc); | |
3064 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
3065 | } |
3066 | ||
a40e3229 MD |
3067 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3068 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3069 | } |
a40e3229 MD |
3070 | memcpy(session->priv->metadata_cache->data + |
3071 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3072 | str, len); |
a40e3229 | 3073 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3074 | kfree(str); |
d83004aa | 3075 | |
d83004aa JD |
3076 | return 0; |
3077 | ||
3078 | err: | |
3079 | kfree(str); | |
3080 | return -ENOMEM; | |
c099397a MD |
3081 | } |
3082 | ||
f513b2bf | 3083 | static |
a40e3229 | 3084 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3085 | { |
3086 | size_t i; | |
3087 | ||
3088 | for (i = 0; i < nesting; i++) { | |
3089 | int ret; | |
3090 | ||
3091 | ret = lttng_metadata_printf(session, " "); | |
3092 | if (ret) { | |
3093 | return ret; | |
3094 | } | |
3095 | } | |
3096 | return 0; | |
3097 | } | |
3098 | ||
ceabb767 | 3099 | static |
a40e3229 | 3100 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3101 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3102 | size_t nesting) |
3103 | { | |
3104 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3105 | } | |
3106 | ||
3107 | static | |
a40e3229 | 3108 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3109 | const struct lttng_kernel_type_integer *type, |
3110 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3111 | size_t nesting) |
3112 | { | |
3113 | int ret; | |
3114 | ||
ceabb767 MD |
3115 | ret = print_tabs(session, nesting); |
3116 | if (ret) | |
3117 | return ret; | |
3118 | ret = lttng_metadata_printf(session, | |
3119 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3120 | type->size, |
3121 | type->alignment, | |
3122 | type->signedness, | |
3123 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3124 | ? "none" |
437d5aa5 | 3125 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3126 | ? "UTF8" |
3127 | : "ASCII", | |
437d5aa5 | 3128 | type->base, |
ceabb767 | 3129 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3130 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3131 | #else |
437d5aa5 | 3132 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3133 | #endif |
3134 | ); | |
3135 | return ret; | |
3136 | } | |
3137 | ||
f513b2bf MD |
3138 | /* |
3139 | * Must be called with sessions_mutex held. | |
3140 | */ | |
3141 | static | |
a40e3229 | 3142 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3143 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3144 | size_t nesting) |
3145 | { | |
f0039724 | 3146 | const char *prev_field_name = NULL; |
f513b2bf MD |
3147 | int ret; |
3148 | uint32_t i, nr_fields; | |
ceabb767 MD |
3149 | unsigned int alignment; |
3150 | ||
f513b2bf MD |
3151 | ret = print_tabs(session, nesting); |
3152 | if (ret) | |
3153 | return ret; | |
3154 | ret = lttng_metadata_printf(session, | |
3155 | "struct {\n"); | |
3156 | if (ret) | |
3157 | return ret; | |
437d5aa5 | 3158 | nr_fields = type->nr_fields; |
f513b2bf | 3159 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3160 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3161 | |
437d5aa5 | 3162 | iter_field = type->fields[i]; |
f0039724 | 3163 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3164 | if (ret) |
3165 | return ret; | |
3166 | } | |
3167 | ret = print_tabs(session, nesting); | |
3168 | if (ret) | |
3169 | return ret; | |
437d5aa5 | 3170 | alignment = type->alignment; |
ceabb767 MD |
3171 | if (alignment) { |
3172 | ret = lttng_metadata_printf(session, | |
3173 | "} align(%u)", | |
3174 | alignment); | |
3175 | } else { | |
3176 | ret = lttng_metadata_printf(session, | |
3177 | "}"); | |
3178 | } | |
f513b2bf MD |
3179 | return ret; |
3180 | } | |
3181 | ||
3182 | /* | |
3183 | * Must be called with sessions_mutex held. | |
3184 | */ | |
3185 | static | |
a40e3229 | 3186 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3187 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3188 | size_t nesting) |
3189 | { | |
3190 | int ret; | |
3191 | ||
3192 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3193 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3194 | if (ret) |
3195 | return ret; | |
ceabb767 | 3196 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3197 | } |
3198 | ||
65c85aa6 MD |
3199 | /* |
3200 | * Must be called with sessions_mutex held. | |
3201 | */ | |
3202 | static | |
a40e3229 | 3203 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3204 | const struct lttng_kernel_type_variant *type, |
f0039724 MD |
3205 | size_t nesting, |
3206 | const char *prev_field_name) | |
65c85aa6 | 3207 | { |
f0039724 | 3208 | const char *tag_name; |
65c85aa6 MD |
3209 | int ret; |
3210 | uint32_t i, nr_choices; | |
3211 | ||
f0039724 MD |
3212 | tag_name = type->tag_name; |
3213 | if (!tag_name) | |
3214 | tag_name = prev_field_name; | |
3215 | if (!tag_name) | |
3216 | return -EINVAL; | |
ceabb767 MD |
3217 | /* |
3218 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3219 | */ | |
437d5aa5 | 3220 | if (type->alignment != 0) |
ceabb767 | 3221 | return -EINVAL; |
65c85aa6 MD |
3222 | ret = print_tabs(session, nesting); |
3223 | if (ret) | |
3224 | return ret; | |
3225 | ret = lttng_metadata_printf(session, | |
3226 | "variant <_%s> {\n", | |
f0039724 | 3227 | tag_name); |
65c85aa6 MD |
3228 | if (ret) |
3229 | return ret; | |
437d5aa5 | 3230 | nr_choices = type->nr_choices; |
65c85aa6 | 3231 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3232 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3233 | |
437d5aa5 | 3234 | iter_field = type->choices[i]; |
f0039724 | 3235 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3236 | if (ret) |
3237 | return ret; | |
3238 | } | |
3239 | ret = print_tabs(session, nesting); | |
3240 | if (ret) | |
3241 | return ret; | |
3242 | ret = lttng_metadata_printf(session, | |
3243 | "}"); | |
3244 | return ret; | |
3245 | } | |
3246 | ||
3247 | /* | |
3248 | * Must be called with sessions_mutex held. | |
3249 | */ | |
3250 | static | |
a40e3229 | 3251 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3252 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3253 | size_t nesting, |
3254 | const char *prev_field_name) | |
65c85aa6 MD |
3255 | { |
3256 | int ret; | |
3257 | ||
3258 | ret = _lttng_variant_type_statedump(session, | |
f0039724 MD |
3259 | lttng_kernel_get_type_variant(field->type), nesting, |
3260 | prev_field_name); | |
65c85aa6 MD |
3261 | if (ret) |
3262 | return ret; | |
ceabb767 | 3263 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3264 | } |
3265 | ||
f513b2bf MD |
3266 | /* |
3267 | * Must be called with sessions_mutex held. | |
3268 | */ | |
3269 | static | |
a40e3229 | 3270 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3271 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3272 | size_t nesting) |
3273 | { | |
3274 | int ret; | |
437d5aa5 MD |
3275 | const struct lttng_kernel_type_array *array_type; |
3276 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3277 | |
437d5aa5 MD |
3278 | array_type = lttng_kernel_get_type_array(field->type); |
3279 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3280 | |
437d5aa5 | 3281 | if (array_type->alignment) { |
ceabb767 | 3282 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3283 | if (ret) |
3284 | return ret; | |
ceabb767 MD |
3285 | ret = lttng_metadata_printf(session, |
3286 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3287 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3288 | field->name); |
3289 | if (ret) | |
3290 | return ret; | |
3291 | } | |
3292 | /* | |
3293 | * Nested compound types: Only array of structures and variants are | |
3294 | * currently supported. | |
3295 | */ | |
437d5aa5 | 3296 | elem_type = array_type->elem_type; |
12bb2edb MD |
3297 | switch (elem_type->type) { |
3298 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3299 | case lttng_kernel_type_struct: |
3300 | case lttng_kernel_type_variant: | |
3301 | ret = _lttng_type_statedump(session, elem_type, | |
3302 | array_type->encoding, nesting); | |
65c85aa6 MD |
3303 | if (ret) |
3304 | return ret; | |
3305 | break; | |
ceabb767 | 3306 | |
f513b2bf MD |
3307 | default: |
3308 | return -EINVAL; | |
3309 | } | |
3310 | ret = lttng_metadata_printf(session, | |
3311 | " _%s[%u];\n", | |
3312 | field->name, | |
437d5aa5 | 3313 | array_type->length); |
f513b2bf MD |
3314 | return ret; |
3315 | } | |
3316 | ||
3317 | /* | |
3318 | * Must be called with sessions_mutex held. | |
3319 | */ | |
3320 | static | |
a40e3229 | 3321 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3322 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3323 | size_t nesting, |
3324 | const char *prev_field_name) | |
f513b2bf MD |
3325 | { |
3326 | int ret; | |
3327 | const char *length_name; | |
437d5aa5 MD |
3328 | const struct lttng_kernel_type_sequence *sequence_type; |
3329 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3330 | |
437d5aa5 MD |
3331 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3332 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3333 | |
437d5aa5 | 3334 | length_name = sequence_type->length_name; |
f0039724 MD |
3335 | if (!length_name) |
3336 | length_name = prev_field_name; | |
3337 | if (!length_name) | |
3338 | return -EINVAL; | |
ceabb767 | 3339 | |
437d5aa5 | 3340 | if (sequence_type->alignment) { |
ceabb767 | 3341 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3342 | if (ret) |
3343 | return ret; | |
ceabb767 MD |
3344 | ret = lttng_metadata_printf(session, |
3345 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3346 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3347 | field->name); |
3348 | if (ret) | |
3349 | return ret; | |
3350 | } | |
3351 | ||
3352 | /* | |
3353 | * Nested compound types: Only array of structures and variants are | |
3354 | * currently supported. | |
3355 | */ | |
437d5aa5 | 3356 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3357 | switch (elem_type->type) { |
3358 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3359 | case lttng_kernel_type_struct: |
3360 | case lttng_kernel_type_variant: | |
3361 | ret = _lttng_type_statedump(session, elem_type, | |
3362 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3363 | if (ret) |
3364 | return ret; | |
3365 | break; | |
ceabb767 | 3366 | |
f513b2bf MD |
3367 | default: |
3368 | return -EINVAL; | |
3369 | } | |
3370 | ret = lttng_metadata_printf(session, | |
3371 | " _%s[ _%s ];\n", | |
3372 | field->name, | |
f0039724 | 3373 | length_name); |
f513b2bf MD |
3374 | return ret; |
3375 | } | |
3376 | ||
141ddf28 MD |
3377 | /* |
3378 | * Must be called with sessions_mutex held. | |
3379 | */ | |
3380 | static | |
a40e3229 | 3381 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3382 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3383 | size_t nesting) |
3384 | { | |
d96a4a7a | 3385 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3386 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3387 | int ret; |
3388 | unsigned int i, nr_entries; | |
3389 | ||
437d5aa5 | 3390 | container_type = type->container_type; |
12bb2edb | 3391 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3392 | ret = -EINVAL; |
3393 | goto end; | |
3394 | } | |
437d5aa5 | 3395 | enum_desc = type->desc; |
141ddf28 MD |
3396 | nr_entries = enum_desc->nr_entries; |
3397 | ||
3398 | ret = print_tabs(session, nesting); | |
3399 | if (ret) | |
3400 | goto end; | |
ceabb767 MD |
3401 | ret = lttng_metadata_printf(session, "enum : "); |
3402 | if (ret) | |
3403 | goto end; | |
437d5aa5 MD |
3404 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3405 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3406 | if (ret) |
ceabb767 MD |
3407 | goto end; |
3408 | ret = lttng_metadata_printf(session, " {\n"); | |
3409 | if (ret) | |
3410 | goto end; | |
141ddf28 MD |
3411 | /* Dump all entries */ |
3412 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3413 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3414 | int j, len; |
3415 | ||
3416 | ret = print_tabs(session, nesting + 1); | |
3417 | if (ret) | |
3418 | goto end; | |
3419 | ret = lttng_metadata_printf(session, | |
3420 | "\""); | |
3421 | if (ret) | |
3422 | goto end; | |
3423 | len = strlen(entry->string); | |
3424 | /* Escape the character '"' */ | |
3425 | for (j = 0; j < len; j++) { | |
3426 | char c = entry->string[j]; | |
3427 | ||
3428 | switch (c) { | |
3429 | case '"': | |
3430 | ret = lttng_metadata_printf(session, | |
3431 | "\\\""); | |
3432 | break; | |
3433 | case '\\': | |
3434 | ret = lttng_metadata_printf(session, | |
3435 | "\\\\"); | |
3436 | break; | |
3437 | default: | |
3438 | ret = lttng_metadata_printf(session, | |
3439 | "%c", c); | |
3440 | break; | |
3441 | } | |
3442 | if (ret) | |
3443 | goto end; | |
3444 | } | |
08ad1061 PP |
3445 | ret = lttng_metadata_printf(session, "\""); |
3446 | if (ret) | |
3447 | goto end; | |
3448 | ||
3449 | if (entry->options.is_auto) { | |
3450 | ret = lttng_metadata_printf(session, ",\n"); | |
3451 | if (ret) | |
3452 | goto end; | |
141ddf28 | 3453 | } else { |
7c559490 MD |
3454 | ret = lttng_metadata_printf(session, |
3455 | " = "); | |
3456 | if (ret) | |
3457 | goto end; | |
3458 | if (entry->start.signedness) | |
141ddf28 | 3459 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3460 | "%lld", (long long) entry->start.value); |
3461 | else | |
3462 | ret = lttng_metadata_printf(session, | |
3463 | "%llu", entry->start.value); | |
3464 | if (ret) | |
3465 | goto end; | |
3466 | if (entry->start.signedness == entry->end.signedness && | |
3467 | entry->start.value | |
3468 | == entry->end.value) { | |
141ddf28 | 3469 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3470 | ",\n"); |
3471 | } else { | |
3472 | if (entry->end.signedness) { | |
3473 | ret = lttng_metadata_printf(session, | |
3474 | " ... %lld,\n", | |
3475 | (long long) entry->end.value); | |
3476 | } else { | |
3477 | ret = lttng_metadata_printf(session, | |
3478 | " ... %llu,\n", | |
3479 | entry->end.value); | |
3480 | } | |
141ddf28 | 3481 | } |
7c559490 MD |
3482 | if (ret) |
3483 | goto end; | |
141ddf28 | 3484 | } |
141ddf28 MD |
3485 | } |
3486 | ret = print_tabs(session, nesting); | |
3487 | if (ret) | |
3488 | goto end; | |
ceabb767 | 3489 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3490 | end: |
3491 | return ret; | |
3492 | } | |
3493 | ||
d83004aa JD |
3494 | /* |
3495 | * Must be called with sessions_mutex held. | |
3496 | */ | |
c099397a | 3497 | static |
a40e3229 | 3498 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3499 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3500 | size_t nesting) |
3501 | { | |
3502 | int ret; | |
437d5aa5 | 3503 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3504 | |
437d5aa5 MD |
3505 | enum_type = lttng_kernel_get_type_enum(field->type); |
3506 | WARN_ON_ONCE(!enum_type); | |
3507 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3508 | if (ret) |
3509 | return ret; | |
3510 | return lttng_field_name_statedump(session, field, nesting); | |
3511 | } | |
3512 | ||
3513 | static | |
a40e3229 | 3514 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3515 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3516 | size_t nesting) |
3517 | { | |
3518 | int ret; | |
3519 | ||
437d5aa5 MD |
3520 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3521 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3522 | if (ret) |
3523 | return ret; | |
3524 | return lttng_field_name_statedump(session, field, nesting); | |
3525 | } | |
3526 | ||
3527 | static | |
a40e3229 | 3528 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3529 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3530 | size_t nesting) |
3531 | { | |
3532 | int ret; | |
3533 | ||
ceabb767 MD |
3534 | /* Default encoding is UTF8 */ |
3535 | ret = print_tabs(session, nesting); | |
3536 | if (ret) | |
3537 | return ret; | |
3538 | ret = lttng_metadata_printf(session, | |
3539 | "string%s", | |
437d5aa5 | 3540 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3541 | " { encoding = ASCII; }" : ""); |
3542 | return ret; | |
3543 | } | |
3544 | ||
3545 | static | |
a40e3229 | 3546 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3547 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3548 | size_t nesting) |
ceabb767 | 3549 | { |
437d5aa5 | 3550 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3551 | int ret; |
3552 | ||
437d5aa5 MD |
3553 | string_type = lttng_kernel_get_type_string(field->type); |
3554 | WARN_ON_ONCE(!string_type); | |
3555 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3556 | if (ret) |
3557 | return ret; | |
3558 | return lttng_field_name_statedump(session, field, nesting); | |
3559 | } | |
3560 | ||
3561 | /* | |
3562 | * Must be called with sessions_mutex held. | |
3563 | */ | |
3564 | static | |
a40e3229 | 3565 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3566 | const struct lttng_kernel_type_common *type, |
3567 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3568 | size_t nesting) |
c099397a | 3569 | { |
c099397a | 3570 | int ret = 0; |
c099397a | 3571 | |
12bb2edb MD |
3572 | switch (type->type) { |
3573 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3574 | ret = _lttng_integer_type_statedump(session, |
3575 | lttng_kernel_get_type_integer(type), | |
3576 | parent_encoding, nesting); | |
8070f5c0 | 3577 | break; |
437d5aa5 MD |
3578 | case lttng_kernel_type_enum: |
3579 | ret = _lttng_enum_type_statedump(session, | |
3580 | lttng_kernel_get_type_enum(type), | |
3581 | nesting); | |
8070f5c0 | 3582 | break; |
12bb2edb | 3583 | case lttng_kernel_type_string: |
437d5aa5 MD |
3584 | ret = _lttng_string_type_statedump(session, |
3585 | lttng_kernel_get_type_string(type), | |
3586 | nesting); | |
ceabb767 | 3587 | break; |
437d5aa5 MD |
3588 | case lttng_kernel_type_struct: |
3589 | ret = _lttng_struct_type_statedump(session, | |
3590 | lttng_kernel_get_type_struct(type), | |
3591 | nesting); | |
8070f5c0 | 3592 | break; |
437d5aa5 MD |
3593 | case lttng_kernel_type_variant: |
3594 | ret = _lttng_variant_type_statedump(session, | |
3595 | lttng_kernel_get_type_variant(type), | |
f0039724 | 3596 | nesting, NULL); |
ceabb767 MD |
3597 | break; |
3598 | ||
3599 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3600 | case lttng_kernel_type_array: |
3601 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3602 | default: |
3603 | WARN_ON_ONCE(1); | |
3604 | return -EINVAL; | |
8070f5c0 | 3605 | } |
ceabb767 MD |
3606 | return ret; |
3607 | } | |
8070f5c0 | 3608 | |
ceabb767 MD |
3609 | /* |
3610 | * Must be called with sessions_mutex held. | |
3611 | */ | |
3612 | static | |
a40e3229 | 3613 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3614 | const struct lttng_kernel_event_field *field, |
f0039724 MD |
3615 | size_t nesting, |
3616 | const char **prev_field_name_p) | |
ceabb767 | 3617 | { |
f0039724 | 3618 | const char *prev_field_name = NULL; |
ceabb767 | 3619 | int ret = 0; |
27d2368e | 3620 | |
f0039724 MD |
3621 | if (prev_field_name_p) |
3622 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3623 | switch (field->type->type) { |
12bb2edb | 3624 | case lttng_kernel_type_integer: |
ceabb767 MD |
3625 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3626 | break; | |
437d5aa5 | 3627 | case lttng_kernel_type_enum: |
ceabb767 | 3628 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3629 | break; |
12bb2edb | 3630 | case lttng_kernel_type_string: |
ceabb767 | 3631 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3632 | break; |
437d5aa5 | 3633 | case lttng_kernel_type_struct: |
ceabb767 | 3634 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3635 | break; |
437d5aa5 | 3636 | case lttng_kernel_type_array: |
ceabb767 | 3637 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3638 | break; |
437d5aa5 | 3639 | case lttng_kernel_type_sequence: |
f0039724 | 3640 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3641 | break; |
437d5aa5 | 3642 | case lttng_kernel_type_variant: |
f0039724 | 3643 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3644 | break; |
f513b2bf | 3645 | |
8070f5c0 MD |
3646 | default: |
3647 | WARN_ON_ONCE(1); | |
3648 | return -EINVAL; | |
3649 | } | |
f0039724 MD |
3650 | if (prev_field_name_p) |
3651 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3652 | return ret; |
3653 | } | |
3654 | ||
3655 | static | |
a40e3229 | 3656 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3657 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3658 | { |
f0039724 | 3659 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3660 | int ret = 0; |
3661 | int i; | |
3662 | ||
3663 | if (!ctx) | |
3664 | return 0; | |
3665 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3666 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3667 | |
f0039724 | 3668 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3669 | if (ret) |
3670 | return ret; | |
3671 | } | |
3672 | return ret; | |
3673 | } | |
3674 | ||
3675 | static | |
a40e3229 | 3676 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3677 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3678 | { |
f0039724 | 3679 | const char *prev_field_name = NULL; |
a67ba386 | 3680 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3681 | int ret = 0; |
3682 | int i; | |
3683 | ||
e69abdfd MD |
3684 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3685 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3686 | |
f0039724 | 3687 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3688 | if (ret) |
3689 | return ret; | |
c099397a MD |
3690 | } |
3691 | return ret; | |
3692 | } | |
3693 | ||
d83004aa JD |
3694 | /* |
3695 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3696 | * The entire event metadata is printed as a single atomic metadata |
3697 | * transaction. | |
d83004aa | 3698 | */ |
c099397a | 3699 | static |
a40e3229 | 3700 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 3701 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3702 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3703 | { |
3704 | int ret = 0; | |
3705 | ||
a67ba386 | 3706 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3707 | return 0; |
ac847066 | 3708 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3709 | return 0; |
3710 | ||
8b97fd42 MD |
3711 | lttng_metadata_begin(session); |
3712 | ||
c099397a MD |
3713 | ret = lttng_metadata_printf(session, |
3714 | "event {\n" | |
ae734547 | 3715 | " name = \"%s\";\n" |
c099397a | 3716 | " id = %u;\n" |
b9074a1b | 3717 | " stream_id = %u;\n", |
a67ba386 MD |
3718 | event_recorder->priv->parent.desc->event_name, |
3719 | event_recorder->priv->id, | |
ac847066 | 3720 | event_recorder->chan->priv->id); |
c099397a MD |
3721 | if (ret) |
3722 | goto end; | |
3723 | ||
8070f5c0 | 3724 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3725 | " fields := struct {\n" |
3726 | ); | |
3727 | if (ret) | |
3728 | goto end; | |
3729 | ||
a67ba386 | 3730 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3731 | if (ret) |
3732 | goto end; | |
3733 | ||
3734 | /* | |
3735 | * LTTng space reservation can only reserve multiples of the | |
3736 | * byte size. | |
3737 | */ | |
3738 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3739 | " };\n" |
3740 | "};\n\n"); | |
c099397a MD |
3741 | if (ret) |
3742 | goto end; | |
3743 | ||
a67ba386 | 3744 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3745 | end: |
8b97fd42 | 3746 | lttng_metadata_end(session); |
c099397a MD |
3747 | return ret; |
3748 | ||
3749 | } | |
3750 | ||
d83004aa JD |
3751 | /* |
3752 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3753 | * The entire channel metadata is printed as a single atomic metadata |
3754 | * transaction. | |
d83004aa | 3755 | */ |
c099397a | 3756 | static |
a40e3229 | 3757 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
ac847066 | 3758 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3759 | { |
3760 | int ret = 0; | |
3761 | ||
ac847066 | 3762 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3763 | return 0; |
d83004aa | 3764 | |
ac847066 | 3765 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3766 | return 0; |
3767 | ||
8b97fd42 MD |
3768 | lttng_metadata_begin(session); |
3769 | ||
ac847066 | 3770 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3771 | ret = lttng_metadata_printf(session, |
3772 | "stream {\n" | |
3773 | " id = %u;\n" | |
9115fbdc | 3774 | " event.header := %s;\n" |
b9074a1b | 3775 | " packet.context := struct packet_context;\n", |
ac847066 MD |
3776 | chan->priv->id, |
3777 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3778 | "struct event_header_large"); |
3779 | if (ret) | |
3780 | goto end; | |
3781 | ||
ac847066 | 3782 | if (chan->priv->ctx) { |
b9074a1b MD |
3783 | ret = lttng_metadata_printf(session, |
3784 | " event.context := struct {\n"); | |
3785 | if (ret) | |
3786 | goto end; | |
3787 | } | |
ac847066 | 3788 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3789 | if (ret) |
3790 | goto end; | |
ac847066 | 3791 | if (chan->priv->ctx) { |
b9074a1b MD |
3792 | ret = lttng_metadata_printf(session, |
3793 | " };\n"); | |
3794 | if (ret) | |
3795 | goto end; | |
3796 | } | |
8070f5c0 MD |
3797 | |
3798 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3799 | "};\n\n"); |
8070f5c0 | 3800 | |
ac847066 | 3801 | chan->priv->metadata_dumped = 1; |
c099397a | 3802 | end: |
8b97fd42 | 3803 | lttng_metadata_end(session); |
c099397a MD |
3804 | return ret; |
3805 | } | |
3806 | ||
d83004aa JD |
3807 | /* |
3808 | * Must be called with sessions_mutex held. | |
3809 | */ | |
9115fbdc | 3810 | static |
a40e3229 | 3811 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3812 | { |
3813 | return lttng_metadata_printf(session, | |
3814 | "struct packet_context {\n" | |
a3ccff4f MD |
3815 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3816 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3817 | " uint64_t content_size;\n" |
3818 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3819 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3820 | " unsigned long events_discarded;\n" |
9115fbdc | 3821 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3822 | "};\n\n" |
9115fbdc MD |
3823 | ); |
3824 | } | |
3825 | ||
3826 | /* | |
3827 | * Compact header: | |
3828 | * id: range: 0 - 30. | |
3829 | * id 31 is reserved to indicate an extended header. | |
3830 | * | |
3831 | * Large header: | |
3832 | * id: range: 0 - 65534. | |
3833 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3834 | * |
3835 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3836 | */ |
3837 | static | |
a40e3229 | 3838 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3839 | { |
3840 | return lttng_metadata_printf(session, | |
3841 | "struct event_header_compact {\n" | |
3842 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3843 | " variant <id> {\n" | |
3844 | " struct {\n" | |
a3ccff4f | 3845 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3846 | " } compact;\n" |
3847 | " struct {\n" | |
3848 | " uint32_t id;\n" | |
a3ccff4f | 3849 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3850 | " } extended;\n" |
3851 | " } v;\n" | |
3852 | "} align(%u);\n" | |
3853 | "\n" | |
3854 | "struct event_header_large {\n" | |
3855 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3856 | " variant <id> {\n" | |
3857 | " struct {\n" | |
a3ccff4f | 3858 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3859 | " } compact;\n" |
3860 | " struct {\n" | |
3861 | " uint32_t id;\n" | |
a3ccff4f | 3862 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3863 | " } extended;\n" |
3864 | " } v;\n" | |
3865 | "} align(%u);\n\n", | |
a90917c3 MD |
3866 | lttng_alignof(uint32_t) * CHAR_BIT, |
3867 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3868 | ); |
3869 | } | |
3870 | ||
a3ccff4f MD |
3871 | /* |
3872 | * Approximation of NTP time of day to clock monotonic correlation, | |
3873 | * taken at start of trace. | |
3874 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3875 | * in future versions. | |
5283350b MD |
3876 | * This function may return a negative offset. It may happen if the |
3877 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3878 | * |
3879 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3880 | * y2038 compliant. | |
a3ccff4f MD |
3881 | */ |
3882 | static | |
8967b2a3 | 3883 | int64_t measure_clock_offset(void) |
a3ccff4f | 3884 | { |
dcb93448 | 3885 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3886 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3887 | int64_t offset; |
a3ccff4f | 3888 | unsigned long flags; |
3636085f MJ |
3889 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3890 | struct timespec64 rts = { 0, 0 }; | |
3891 | #else | |
3892 | struct timespec rts = { 0, 0 }; | |
3893 | #endif | |
a3ccff4f MD |
3894 | |
3895 | /* Disable interrupts to increase correlation precision. */ | |
3896 | local_irq_save(flags); | |
3897 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3898 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3899 | ktime_get_real_ts64(&rts); | |
3900 | #else | |
216b6baa | 3901 | getnstimeofday(&rts); |
3636085f | 3902 | #endif |
a3ccff4f MD |
3903 | monotonic[1] = trace_clock_read64(); |
3904 | local_irq_restore(flags); | |
3905 | ||
dcb93448 | 3906 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3907 | realtime = (uint64_t) rts.tv_sec * tcf; |
3908 | if (tcf == NSEC_PER_SEC) { | |
3909 | realtime += rts.tv_nsec; | |
3910 | } else { | |
3911 | uint64_t n = rts.tv_nsec * tcf; | |
3912 | ||
3913 | do_div(n, NSEC_PER_SEC); | |
3914 | realtime += n; | |
3915 | } | |
dcb93448 | 3916 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3917 | return offset; |
3918 | } | |
3919 | ||
3eb95be4 | 3920 | static |
a40e3229 | 3921 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3922 | { |
0f3eaad4 | 3923 | int ret = 0; |
3eb95be4 JR |
3924 | size_t i; |
3925 | char cur; | |
3926 | ||
3927 | i = 0; | |
3928 | cur = string[i]; | |
3929 | while (cur != '\0') { | |
3930 | switch (cur) { | |
3931 | case '\n': | |
3932 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3933 | break; | |
3934 | case '\\': | |
3935 | case '"': | |
3936 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3937 | if (ret) | |
3938 | goto error; | |
3939 | /* We still print the current char */ | |
c570be0d | 3940 | lttng_fallthrough; |
3eb95be4 JR |
3941 | default: |
3942 | ret = lttng_metadata_printf(session, "%c", cur); | |
3943 | break; | |
3944 | } | |
3945 | ||
3946 | if (ret) | |
3947 | goto error; | |
3948 | ||
3949 | cur = string[++i]; | |
3950 | } | |
3951 | error: | |
3952 | return ret; | |
3953 | } | |
3954 | ||
3955 | static | |
a40e3229 | 3956 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3957 | const char *field_value) |
3eb95be4 JR |
3958 | { |
3959 | int ret; | |
3960 | ||
1c88f269 | 3961 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3962 | if (ret) |
3963 | goto error; | |
3964 | ||
1c88f269 | 3965 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3966 | if (ret) |
3967 | goto error; | |
3968 | ||
3969 | ret = lttng_metadata_printf(session, "\";\n"); | |
3970 | ||
3971 | error: | |
3972 | return ret; | |
3973 | } | |
3974 | ||
c099397a MD |
3975 | /* |
3976 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3977 | * Must be called with sessions_mutex held. |
c099397a MD |
3978 | */ |
3979 | static | |
a40e3229 | 3980 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3981 | { |
a40e3229 | 3982 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3983 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3984 | const char *product_uuid; |
ac847066 | 3985 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3986 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3987 | int ret = 0; |
3988 | ||
585e5dcc | 3989 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3990 | return 0; |
8b97fd42 MD |
3991 | |
3992 | lttng_metadata_begin(session); | |
3993 | ||
a40e3229 | 3994 | if (session->priv->metadata_dumped) |
c099397a | 3995 | goto skip_session; |
c099397a | 3996 | |
d793d5e1 | 3997 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3998 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3999 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
4000 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
4001 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
4002 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
4003 | |
4004 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
4005 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
4006 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
4007 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
4008 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 4009 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
4010 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
4011 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
4012 | "\n" |
4013 | "trace {\n" | |
4014 | " major = %u;\n" | |
4015 | " minor = %u;\n" | |
30bdb6e4 | 4016 | " uuid = \"%s\";\n" |
d793d5e1 MD |
4017 | " byte_order = %s;\n" |
4018 | " packet.header := struct {\n" | |
4019 | " uint32_t magic;\n" | |
1ec3f75a | 4020 | " uint8_t uuid[16];\n" |
d793d5e1 | 4021 | " uint32_t stream_id;\n" |
5594698f | 4022 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 4023 | " };\n" |
d793d5e1 | 4024 | "};\n\n", |
a90917c3 MD |
4025 | lttng_alignof(uint8_t) * CHAR_BIT, |
4026 | lttng_alignof(uint16_t) * CHAR_BIT, | |
4027 | lttng_alignof(uint32_t) * CHAR_BIT, | |
4028 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
4029 | sizeof(unsigned long) * CHAR_BIT, |
4030 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
4031 | CTF_SPEC_MAJOR, |
4032 | CTF_SPEC_MINOR, | |
d793d5e1 | 4033 | uuid_s, |
5214fa50 | 4034 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
4035 | "be" |
4036 | #else | |
4037 | "le" | |
4038 | #endif | |
4039 | ); | |
4040 | if (ret) | |
4041 | goto end; | |
4042 | ||
99dc9597 MD |
4043 | ret = lttng_metadata_printf(session, |
4044 | "env {\n" | |
a6058143 | 4045 | " hostname = \"%s\";\n" |
c6c9e10f | 4046 | " domain = \"kernel\";\n" |
99dc9597 | 4047 | " sysname = \"%s\";\n" |
c6c9e10f MD |
4048 | " kernel_release = \"%s\";\n" |
4049 | " kernel_version = \"%s\";\n" | |
4050 | " tracer_name = \"lttng-modules\";\n" | |
4051 | " tracer_major = %d;\n" | |
4052 | " tracer_minor = %d;\n" | |
4053 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 4054 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 4055 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
4056 | utsname()->sysname, |
4057 | utsname()->release, | |
c6c9e10f MD |
4058 | utsname()->version, |
4059 | LTTNG_MODULES_MAJOR_VERSION, | |
4060 | LTTNG_MODULES_MINOR_VERSION, | |
4061 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
4062 | ); |
4063 | if (ret) | |
4064 | goto end; | |
4065 | ||
a40e3229 | 4066 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
4067 | if (ret) |
4068 | goto end; | |
4069 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
a40e3229 | 4070 | session->priv->creation_time); |
3eb95be4 JR |
4071 | if (ret) |
4072 | goto end; | |
4073 | ||
c88f762e GB |
4074 | /* Add the product UUID to the 'env' section */ |
4075 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4076 | if (product_uuid) { | |
4077 | ret = lttng_metadata_printf(session, | |
4078 | " product_uuid = \"%s\";\n", | |
4079 | product_uuid | |
4080 | ); | |
4081 | if (ret) | |
4082 | goto end; | |
4083 | } | |
4084 | ||
4085 | /* Close the 'env' section */ | |
3eb95be4 JR |
4086 | ret = lttng_metadata_printf(session, "};\n\n"); |
4087 | if (ret) | |
4088 | goto end; | |
4089 | ||
a3ccff4f MD |
4090 | ret = lttng_metadata_printf(session, |
4091 | "clock {\n" | |
2754583e MD |
4092 | " name = \"%s\";\n", |
4093 | trace_clock_name() | |
a82c63f1 MD |
4094 | ); |
4095 | if (ret) | |
4096 | goto end; | |
4097 | ||
4098 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4099 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4100 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4101 | clock_uuid_s |
4102 | ); | |
4103 | if (ret) | |
4104 | goto end; | |
4105 | } | |
4106 | ||
4107 | ret = lttng_metadata_printf(session, | |
2754583e | 4108 | " description = \"%s\";\n" |
a3ccff4f MD |
4109 | " freq = %llu; /* Frequency, in Hz */\n" |
4110 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4111 | " offset = %lld;\n" |
a3ccff4f | 4112 | "};\n\n", |
2754583e | 4113 | trace_clock_description(), |
a3ccff4f | 4114 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4115 | (long long) measure_clock_offset() |
a3ccff4f MD |
4116 | ); |
4117 | if (ret) | |
4118 | goto end; | |
4119 | ||
4120 | ret = lttng_metadata_printf(session, | |
4121 | "typealias integer {\n" | |
4122 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4123 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4124 | "} := uint27_clock_monotonic_t;\n" |
4125 | "\n" | |
4126 | "typealias integer {\n" | |
4127 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4128 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4129 | "} := uint32_clock_monotonic_t;\n" |
4130 | "\n" | |
4131 | "typealias integer {\n" | |
4132 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4133 | " map = clock.%s.value;\n" |
a3ccff4f | 4134 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4135 | trace_clock_name(), |
a3ccff4f | 4136 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4137 | trace_clock_name(), |
4138 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4139 | trace_clock_name() | |
a3ccff4f MD |
4140 | ); |
4141 | if (ret) | |
4142 | goto end; | |
4143 | ||
a90917c3 | 4144 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4145 | if (ret) |
4146 | goto end; | |
4147 | ||
a90917c3 | 4148 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4149 | if (ret) |
4150 | goto end; | |
4151 | ||
c099397a | 4152 | skip_session: |
ac847066 MD |
4153 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4154 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4155 | if (ret) |
4156 | goto end; | |
4157 | } | |
4158 | ||
a40e3229 | 4159 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4160 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4161 | event_recorder_priv->pub); | |
c099397a MD |
4162 | if (ret) |
4163 | goto end; | |
4164 | } | |
a40e3229 | 4165 | session->priv->metadata_dumped = 1; |
c099397a | 4166 | end: |
8b97fd42 | 4167 | lttng_metadata_end(session); |
c099397a MD |
4168 | return ret; |
4169 | } | |
4170 | ||
c0e31d2e | 4171 | /** |
a90917c3 | 4172 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4173 | * @transport: transport structure |
4174 | * | |
4175 | * Registers a transport which can be used as output to extract the data out of | |
4176 | * LTTng. The module calling this registration function must ensure that no | |
4177 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4178 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4179 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4180 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4181 | * after its registration must it synchronize the TLBs. |
4182 | */ | |
a90917c3 | 4183 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4184 | { |
4185 | /* | |
4186 | * Make sure no page fault can be triggered by the module about to be | |
4187 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4188 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4189 | */ |
263b6c88 | 4190 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4191 | |
4192 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4193 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4194 | mutex_unlock(&sessions_mutex); |
4195 | } | |
a90917c3 | 4196 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4197 | |
4198 | /** | |
a90917c3 | 4199 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4200 | * @transport: transport structure |
4201 | */ | |
a90917c3 | 4202 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4203 | { |
4204 | mutex_lock(&sessions_mutex); | |
4205 | list_del(&transport->node); | |
4206 | mutex_unlock(&sessions_mutex); | |
4207 | } | |
a90917c3 | 4208 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4209 | |
a101fa10 MD |
4210 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4211 | { | |
4212 | /* | |
4213 | * Make sure no page fault can be triggered by the module about to be | |
4214 | * registered. We deal with this here so we don't have to call | |
4215 | * vmalloc_sync_mappings() in each module's init. | |
4216 | */ | |
4217 | wrapper_vmalloc_sync_mappings(); | |
4218 | ||
4219 | mutex_lock(&sessions_mutex); | |
4220 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4221 | mutex_unlock(&sessions_mutex); | |
4222 | } | |
4223 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4224 | ||
4225 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4226 | { | |
4227 | mutex_lock(&sessions_mutex); | |
4228 | list_del(&transport->node); | |
4229 | mutex_unlock(&sessions_mutex); | |
4230 | } | |
4231 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4232 | ||
5f4c791e | 4233 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4234 | |
4235 | enum cpuhp_state lttng_hp_prepare; | |
4236 | enum cpuhp_state lttng_hp_online; | |
4237 | ||
4238 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4239 | { | |
4240 | struct lttng_cpuhp_node *lttng_node; | |
4241 | ||
4242 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4243 | switch (lttng_node->component) { | |
4244 | case LTTNG_RING_BUFFER_FRONTEND: | |
4245 | return 0; | |
4246 | case LTTNG_RING_BUFFER_BACKEND: | |
4247 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4248 | case LTTNG_RING_BUFFER_ITER: | |
4249 | return 0; | |
4250 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4251 | return 0; | |
4252 | default: | |
4253 | return -EINVAL; | |
4254 | } | |
4255 | } | |
4256 | ||
4257 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4258 | { | |
4259 | struct lttng_cpuhp_node *lttng_node; | |
4260 | ||
4261 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4262 | switch (lttng_node->component) { | |
4263 | case LTTNG_RING_BUFFER_FRONTEND: | |
4264 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4265 | case LTTNG_RING_BUFFER_BACKEND: | |
4266 | return 0; | |
4267 | case LTTNG_RING_BUFFER_ITER: | |
4268 | return 0; | |
4269 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4270 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4271 | default: | |
4272 | return -EINVAL; | |
4273 | } | |
4274 | } | |
4275 | ||
4276 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4277 | { | |
4278 | struct lttng_cpuhp_node *lttng_node; | |
4279 | ||
4280 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4281 | switch (lttng_node->component) { | |
4282 | case LTTNG_RING_BUFFER_FRONTEND: | |
4283 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4284 | case LTTNG_RING_BUFFER_BACKEND: | |
4285 | return 0; | |
4286 | case LTTNG_RING_BUFFER_ITER: | |
4287 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4288 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4289 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4290 | default: | |
4291 | return -EINVAL; | |
4292 | } | |
4293 | } | |
4294 | ||
4295 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4296 | { | |
4297 | struct lttng_cpuhp_node *lttng_node; | |
4298 | ||
4299 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4300 | switch (lttng_node->component) { | |
4301 | case LTTNG_RING_BUFFER_FRONTEND: | |
4302 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4303 | case LTTNG_RING_BUFFER_BACKEND: | |
4304 | return 0; | |
4305 | case LTTNG_RING_BUFFER_ITER: | |
4306 | return 0; | |
4307 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4308 | return 0; | |
4309 | default: | |
4310 | return -EINVAL; | |
4311 | } | |
4312 | } | |
4313 | ||
4314 | static int __init lttng_init_cpu_hotplug(void) | |
4315 | { | |
4316 | int ret; | |
4317 | ||
4318 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4319 | lttng_hotplug_prepare, | |
4320 | lttng_hotplug_dead); | |
4321 | if (ret < 0) { | |
4322 | return ret; | |
4323 | } | |
4324 | lttng_hp_prepare = ret; | |
4325 | lttng_rb_set_hp_prepare(ret); | |
4326 | ||
4327 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4328 | lttng_hotplug_online, | |
4329 | lttng_hotplug_offline); | |
4330 | if (ret < 0) { | |
4331 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4332 | lttng_hp_prepare = 0; | |
4333 | return ret; | |
4334 | } | |
4335 | lttng_hp_online = ret; | |
4336 | lttng_rb_set_hp_online(ret); | |
4337 | ||
4338 | return 0; | |
4339 | } | |
4340 | ||
4341 | static void __exit lttng_exit_cpu_hotplug(void) | |
4342 | { | |
4343 | lttng_rb_set_hp_online(0); | |
4344 | cpuhp_remove_multi_state(lttng_hp_online); | |
4345 | lttng_rb_set_hp_prepare(0); | |
4346 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4347 | } | |
4348 | ||
5f4c791e | 4349 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4350 | static int lttng_init_cpu_hotplug(void) |
4351 | { | |
4352 | return 0; | |
4353 | } | |
4354 | static void lttng_exit_cpu_hotplug(void) | |
4355 | { | |
4356 | } | |
5f4c791e | 4357 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4358 | |
a90917c3 | 4359 | static int __init lttng_events_init(void) |
4e3c1b9b | 4360 | { |
1c25284c MD |
4361 | int ret; |
4362 | ||
453b2495 JD |
4363 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4364 | if (ret) | |
4365 | return ret; | |
389d7070 | 4366 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4367 | if (ret) |
4368 | return ret; | |
4369 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4370 | if (ret) |
4371 | return ret; | |
4372 | ret = lttng_probes_init(); | |
389d7070 MD |
4373 | if (ret) |
4374 | return ret; | |
07dfc1d0 | 4375 | ret = lttng_context_init(); |
20591cf7 MD |
4376 | if (ret) |
4377 | return ret; | |
07dfc1d0 MD |
4378 | ret = lttng_tracepoint_init(); |
4379 | if (ret) | |
4380 | goto error_tp; | |
a67ba386 MD |
4381 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4382 | if (!event_recorder_cache) { | |
20591cf7 | 4383 | ret = -ENOMEM; |
a67ba386 | 4384 | goto error_kmem_event_recorder; |
dffef45d | 4385 | } |
a67ba386 MD |
4386 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4387 | if (!event_recorder_private_cache) { | |
4388 | ret = -ENOMEM; | |
4389 | goto error_kmem_event_recorder_private; | |
4390 | } | |
4391 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4392 | if (!event_notifier_cache) { |
4393 | ret = -ENOMEM; | |
4394 | goto error_kmem_event_notifier; | |
20591cf7 | 4395 | } |
a67ba386 MD |
4396 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4397 | if (!event_notifier_private_cache) { | |
4398 | ret = -ENOMEM; | |
4399 | goto error_kmem_event_notifier_private; | |
4400 | } | |
80996790 | 4401 | ret = lttng_abi_init(); |
02119ee5 MD |
4402 | if (ret) |
4403 | goto error_abi; | |
0c956676 MD |
4404 | ret = lttng_logger_init(); |
4405 | if (ret) | |
4406 | goto error_logger; | |
1e367326 MD |
4407 | ret = lttng_init_cpu_hotplug(); |
4408 | if (ret) | |
4409 | goto error_hotplug; | |
101215b7 | 4410 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4411 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4412 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4413 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4414 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4415 | LTTNG_VERSION_NAME, |
4416 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4417 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4418 | #else | |
4419 | "", | |
4420 | #endif | |
4421 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4422 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4423 | #else | |
4424 | ""); | |
4425 | #endif | |
f73c5a43 MJ |
4426 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4427 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4428 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4429 | return 0; |
0c956676 | 4430 | |
1e367326 MD |
4431 | error_hotplug: |
4432 | lttng_logger_exit(); | |
0c956676 MD |
4433 | error_logger: |
4434 | lttng_abi_exit(); | |
02119ee5 | 4435 | error_abi: |
a67ba386 MD |
4436 | kmem_cache_destroy(event_notifier_private_cache); |
4437 | error_kmem_event_notifier_private: | |
dffef45d FD |
4438 | kmem_cache_destroy(event_notifier_cache); |
4439 | error_kmem_event_notifier: | |
a67ba386 MD |
4440 | kmem_cache_destroy(event_recorder_private_cache); |
4441 | error_kmem_event_recorder_private: | |
4442 | kmem_cache_destroy(event_recorder_cache); | |
4443 | error_kmem_event_recorder: | |
20591cf7 | 4444 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4445 | error_tp: |
4446 | lttng_context_exit(); | |
101215b7 | 4447 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4448 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4449 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4450 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4451 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4452 | LTTNG_VERSION_NAME, |
4453 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4454 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4455 | #else | |
4456 | "", | |
4457 | #endif | |
4458 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4459 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4460 | #else | |
4461 | ""); | |
4462 | #endif | |
1c25284c | 4463 | return ret; |
4e3c1b9b MD |
4464 | } |
4465 | ||
a90917c3 | 4466 | module_init(lttng_events_init); |
11b5a3c2 | 4467 | |
a90917c3 | 4468 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4469 | { |
a40e3229 | 4470 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4471 | |
1e367326 | 4472 | lttng_exit_cpu_hotplug(); |
0c956676 | 4473 | lttng_logger_exit(); |
80996790 | 4474 | lttng_abi_exit(); |
a40e3229 MD |
4475 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4476 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4477 | kmem_cache_destroy(event_recorder_cache); |
4478 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4479 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4480 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4481 | lttng_tracepoint_exit(); |
07dfc1d0 | 4482 | lttng_context_exit(); |
101215b7 | 4483 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4484 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4485 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4486 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4487 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4488 | LTTNG_VERSION_NAME, |
4489 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4490 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4491 | #else | |
4492 | "", | |
4493 | #endif | |
4494 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4495 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4496 | #else | |
4497 | ""); | |
4498 | #endif | |
4e3c1b9b | 4499 | } |
92e94819 | 4500 | |
a90917c3 | 4501 | module_exit(lttng_events_exit); |
11b5a3c2 | 4502 | |
7ca11e77 | 4503 | #include <generated/patches.h> |
101215b7 MJ |
4504 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4505 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4506 | #endif | |
4507 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4508 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4509 | #endif | |
92e94819 MD |
4510 | MODULE_LICENSE("GPL and additional rights"); |
4511 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4512 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4513 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4514 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4515 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4516 | LTTNG_MODULES_EXTRAVERSION); |