Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
8c6e7f13 | 27 | #include <linux/uaccess.h> |
a606b6e8 | 28 | #include <linux/vmalloc.h> |
c88f762e | 29 | #include <linux/dmi.h> |
3c997079 | 30 | |
c190d76e | 31 | #include <wrapper/compiler_attributes.h> |
a7008254 | 32 | #include <wrapper/uuid.h> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
34 | #include <wrapper/random.h> |
35 | #include <wrapper/tracepoint.h> | |
36 | #include <wrapper/list.h> | |
cbc19040 | 37 | #include <wrapper/types.h> |
2df37e95 MD |
38 | #include <lttng/kernel-version.h> |
39 | #include <lttng/events.h> | |
92bc1e23 | 40 | #include <lttng/events-internal.h> |
0b365677 | 41 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 42 | #include <lttng/tracer.h> |
21f58fb7 | 43 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
44 | #include <lttng/abi-old.h> |
45 | #include <lttng/endian.h> | |
46 | #include <lttng/string-utils.h> | |
4a11ef1c | 47 | #include <lttng/utils.h> |
24591303 MD |
48 | #include <ringbuffer/backend.h> |
49 | #include <ringbuffer/frontend.h> | |
3636085f | 50 | #include <wrapper/time.h> |
4e3c1b9b | 51 | |
d83004aa JD |
52 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
53 | ||
4e3c1b9b | 54 | static LIST_HEAD(sessions); |
750b05f2 | 55 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 56 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 57 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
58 | /* |
59 | * Protect the sessions and metadata caches. | |
60 | */ | |
4e3c1b9b | 61 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
62 | static struct kmem_cache *event_recorder_cache; |
63 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 64 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 65 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 66 | |
8cdc1a81 MD |
67 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
68 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b01155ba | 69 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
7b25ab0e | 70 | static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler); |
3c997079 | 71 | |
0648898e | 72 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
f7d06400 | 73 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
96c59af1 | 74 | static int _lttng_event_recorder_unregister(struct lttng_kernel_event_recorder *event); |
a67ba386 | 75 | static int _lttng_event_notifier_unregister(struct lttng_kernel_event_notifier *event_notifier); |
c099397a | 76 | static |
8cdc1a81 | 77 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 78 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 79 | struct lttng_kernel_event_recorder *event); |
c099397a | 80 | static |
8cdc1a81 | 81 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
82 | static |
83 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 84 | static |
8cdc1a81 | 85 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
86 | const struct lttng_kernel_type_common *type, |
87 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
88 | size_t nesting); |
89 | static | |
8cdc1a81 | 90 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 91 | const struct lttng_kernel_event_field *field, |
51ef4536 | 92 | size_t nesting, const char **prev_field_name_p); |
c099397a | 93 | |
c099397a | 94 | void synchronize_trace(void) |
abcca994 | 95 | { |
05355f0b MJ |
96 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
97 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
98 | synchronize_rcu(); |
99 | #else | |
abcca994 | 100 | synchronize_sched(); |
92da05ce MJ |
101 | #endif |
102 | ||
5f4c791e | 103 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
104 | #ifdef CONFIG_PREEMPT_RT_FULL |
105 | synchronize_rcu(); | |
106 | #endif | |
5f4c791e | 107 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
108 | #ifdef CONFIG_PREEMPT_RT |
109 | synchronize_rcu(); | |
110 | #endif | |
5f4c791e | 111 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
112 | } |
113 | ||
3c997079 MD |
114 | void lttng_lock_sessions(void) |
115 | { | |
116 | mutex_lock(&sessions_mutex); | |
117 | } | |
118 | ||
119 | void lttng_unlock_sessions(void) | |
120 | { | |
121 | mutex_unlock(&sessions_mutex); | |
122 | } | |
123 | ||
9fe593d2 FD |
124 | static struct lttng_transport *lttng_transport_find(const char *name) |
125 | { | |
126 | struct lttng_transport *transport; | |
127 | ||
128 | list_for_each_entry(transport, <tng_transport_list, node) { | |
129 | if (!strcmp(transport->name, name)) | |
130 | return transport; | |
131 | } | |
132 | return NULL; | |
133 | } | |
134 | ||
3c997079 MD |
135 | /* |
136 | * Called with sessions lock held. | |
137 | */ | |
138 | int lttng_session_active(void) | |
139 | { | |
8cdc1a81 | 140 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
141 | |
142 | list_for_each_entry(iter, &sessions, list) { | |
8cdc1a81 | 143 | if (iter->pub->active) |
3c997079 MD |
144 | return 1; |
145 | } | |
146 | return 0; | |
147 | } | |
148 | ||
8cdc1a81 | 149 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 150 | { |
8cdc1a81 MD |
151 | struct lttng_kernel_session *session; |
152 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 153 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 154 | int i; |
4e3c1b9b MD |
155 | |
156 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 157 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 158 | if (!session) |
d83004aa | 159 | goto err; |
8cdc1a81 MD |
160 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
161 | if (!session_priv) | |
162 | goto err_free_session; | |
163 | session->priv = session_priv; | |
164 | session_priv->pub = session; | |
165 | ||
166 | INIT_LIST_HEAD(&session_priv->chan); | |
167 | INIT_LIST_HEAD(&session_priv->events); | |
168 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
169 | |
170 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
171 | GFP_KERNEL); | |
172 | if (!metadata_cache) | |
8cdc1a81 | 173 | goto err_free_session_private; |
0ca42eb7 | 174 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
175 | if (!metadata_cache->data) |
176 | goto err_free_cache; | |
177 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
178 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 179 | mutex_init(&metadata_cache->lock); |
8cdc1a81 | 180 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 181 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
8cdc1a81 | 182 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 183 | sizeof(metadata_cache->uuid)); |
8cdc1a81 | 184 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 185 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
8cdc1a81 MD |
186 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
187 | list_add(&session_priv->list, &sessions); | |
188 | ||
8c0393c3 MD |
189 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
190 | goto tracker_alloc_error; | |
191 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
192 | goto tracker_alloc_error; | |
193 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
194 | goto tracker_alloc_error; | |
195 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
196 | goto tracker_alloc_error; | |
197 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
198 | goto tracker_alloc_error; | |
199 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
200 | goto tracker_alloc_error; | |
201 | ||
4e3c1b9b | 202 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 203 | |
4e3c1b9b | 204 | return session; |
d83004aa | 205 | |
8c0393c3 MD |
206 | tracker_alloc_error: |
207 | lttng_id_tracker_fini(&session->pid_tracker); | |
208 | lttng_id_tracker_fini(&session->vpid_tracker); | |
209 | lttng_id_tracker_fini(&session->uid_tracker); | |
210 | lttng_id_tracker_fini(&session->vuid_tracker); | |
211 | lttng_id_tracker_fini(&session->gid_tracker); | |
212 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
213 | err_free_cache: |
214 | kfree(metadata_cache); | |
8cdc1a81 MD |
215 | err_free_session_private: |
216 | lttng_kvfree(session_priv); | |
d83004aa | 217 | err_free_session: |
48f5e0b5 | 218 | lttng_kvfree(session); |
d83004aa JD |
219 | err: |
220 | mutex_unlock(&sessions_mutex); | |
221 | return NULL; | |
222 | } | |
223 | ||
99f52fcc FD |
224 | static |
225 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
226 | { | |
227 | struct lttng_counter_transport *transport; | |
228 | ||
229 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
230 | if (!strcmp(transport->name, name)) | |
231 | return transport; | |
232 | } | |
233 | return NULL; | |
234 | } | |
235 | ||
236 | struct lttng_counter *lttng_kernel_counter_create( | |
237 | const char *counter_transport_name, | |
238 | size_t number_dimensions, const size_t *dimensions_sizes) | |
239 | { | |
240 | struct lttng_counter *counter = NULL; | |
241 | struct lttng_counter_transport *counter_transport = NULL; | |
242 | ||
243 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
244 | if (!counter_transport) { | |
245 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
246 | counter_transport_name); | |
247 | goto notransport; | |
248 | } | |
249 | if (!try_module_get(counter_transport->owner)) { | |
250 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
251 | goto notransport; | |
252 | } | |
253 | ||
254 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
255 | if (!counter) | |
256 | goto nomem; | |
257 | ||
258 | /* Create event notifier error counter. */ | |
259 | counter->ops = &counter_transport->ops; | |
260 | counter->transport = counter_transport; | |
261 | ||
262 | counter->counter = counter->ops->counter_create( | |
263 | number_dimensions, dimensions_sizes, 0); | |
264 | if (!counter->counter) { | |
265 | goto create_error; | |
266 | } | |
267 | ||
268 | return counter; | |
269 | ||
270 | create_error: | |
271 | lttng_kvfree(counter); | |
272 | nomem: | |
273 | if (counter_transport) | |
274 | module_put(counter_transport->owner); | |
275 | notransport: | |
276 | return NULL; | |
277 | } | |
278 | ||
750b05f2 FD |
279 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
280 | { | |
281 | struct lttng_transport *transport = NULL; | |
282 | struct lttng_event_notifier_group *event_notifier_group; | |
283 | const char *transport_name = "relay-event-notifier"; | |
284 | size_t subbuf_size = 4096; //TODO | |
285 | size_t num_subbuf = 16; //TODO | |
286 | unsigned int switch_timer_interval = 0; | |
287 | unsigned int read_timer_interval = 0; | |
dffef45d | 288 | int i; |
750b05f2 FD |
289 | |
290 | mutex_lock(&sessions_mutex); | |
291 | ||
292 | transport = lttng_transport_find(transport_name); | |
293 | if (!transport) { | |
294 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
295 | transport_name); | |
296 | goto notransport; | |
297 | } | |
298 | if (!try_module_get(transport->owner)) { | |
299 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
300 | transport_name); | |
301 | goto notransport; | |
302 | } | |
303 | ||
304 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
305 | GFP_KERNEL); | |
306 | if (!event_notifier_group) | |
307 | goto nomem; | |
308 | ||
309 | /* | |
310 | * Initialize the ring buffer used to store event notifier | |
311 | * notifications. | |
312 | */ | |
313 | event_notifier_group->ops = &transport->ops; | |
4a399b76 | 314 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
315 | transport_name, event_notifier_group, NULL, |
316 | subbuf_size, num_subbuf, switch_timer_interval, | |
317 | read_timer_interval); | |
318 | if (!event_notifier_group->chan) | |
319 | goto create_error; | |
320 | ||
321 | event_notifier_group->transport = transport; | |
dffef45d FD |
322 | |
323 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
324 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
325 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
326 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
327 | ||
750b05f2 FD |
328 | list_add(&event_notifier_group->node, &event_notifier_groups); |
329 | ||
330 | mutex_unlock(&sessions_mutex); | |
331 | ||
332 | return event_notifier_group; | |
333 | ||
334 | create_error: | |
335 | lttng_kvfree(event_notifier_group); | |
336 | nomem: | |
337 | if (transport) | |
338 | module_put(transport->owner); | |
339 | notransport: | |
340 | mutex_unlock(&sessions_mutex); | |
341 | return NULL; | |
342 | } | |
343 | ||
d83004aa JD |
344 | void metadata_cache_destroy(struct kref *kref) |
345 | { | |
346 | struct lttng_metadata_cache *cache = | |
347 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 348 | vfree(cache->data); |
d83004aa | 349 | kfree(cache); |
4e3c1b9b MD |
350 | } |
351 | ||
8cdc1a81 | 352 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 353 | { |
f7d06400 | 354 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 355 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 356 | struct lttng_metadata_stream *metadata_stream; |
44b1abdc | 357 | struct lttng_event_recorder_enabler *event_recorder_enabler, *tmp_event_recorder_enabler; |
dda6a249 | 358 | int ret; |
4e3c1b9b MD |
359 | |
360 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 361 | WRITE_ONCE(session->active, 0); |
f7d06400 | 362 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 363 | ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table); |
1ec65de1 MD |
364 | WARN_ON(ret); |
365 | } | |
8cdc1a81 | 366 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
96c59af1 | 367 | ret = _lttng_event_recorder_unregister(event_recorder_priv->pub); |
dda6a249 MD |
368 | WARN_ON(ret); |
369 | } | |
abcca994 | 370 | synchronize_trace(); /* Wait for in-flight events to complete */ |
f7d06400 | 371 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 372 | ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table); |
badfe9f5 MD |
373 | WARN_ON(ret); |
374 | } | |
44b1abdc | 375 | list_for_each_entry_safe(event_recorder_enabler, tmp_event_recorder_enabler, |
8cdc1a81 | 376 | &session->priv->enablers_head, node) |
44b1abdc | 377 | lttng_event_enabler_destroy(&event_recorder_enabler->parent); |
8cdc1a81 | 378 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node) |
0648898e | 379 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
f7d06400 MD |
380 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
381 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
382 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 383 | } |
8cdc1a81 MD |
384 | mutex_lock(&session->priv->metadata_cache->lock); |
385 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 386 | _lttng_metadata_channel_hangup(metadata_stream); |
8cdc1a81 | 387 | mutex_unlock(&session->priv->metadata_cache->lock); |
8c0393c3 MD |
388 | lttng_id_tracker_fini(&session->pid_tracker); |
389 | lttng_id_tracker_fini(&session->vpid_tracker); | |
390 | lttng_id_tracker_fini(&session->uid_tracker); | |
391 | lttng_id_tracker_fini(&session->vuid_tracker); | |
392 | lttng_id_tracker_fini(&session->gid_tracker); | |
393 | lttng_id_tracker_fini(&session->vgid_tracker); | |
8cdc1a81 MD |
394 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
395 | list_del(&session->priv->list); | |
4e3c1b9b | 396 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 397 | lttng_kvfree(session->priv); |
48f5e0b5 | 398 | lttng_kvfree(session); |
4e3c1b9b MD |
399 | } |
400 | ||
dffef45d FD |
401 | void lttng_event_notifier_group_destroy( |
402 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 403 | { |
dffef45d | 404 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
a67ba386 | 405 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
406 | int ret; |
407 | ||
750b05f2 FD |
408 | if (!event_notifier_group) |
409 | return; | |
410 | ||
411 | mutex_lock(&sessions_mutex); | |
dffef45d | 412 | |
6053e75e | 413 | ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table); |
8a8ac9a8 FD |
414 | WARN_ON(ret); |
415 | ||
a67ba386 MD |
416 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
417 | &event_notifier_group->event_notifiers_head, node) { | |
418 | ret = _lttng_event_notifier_unregister(event_notifier_priv->pub); | |
dffef45d FD |
419 | WARN_ON(ret); |
420 | } | |
421 | ||
b01155ba FD |
422 | /* Wait for in-flight event notifier to complete */ |
423 | synchronize_trace(); | |
424 | ||
21f58fb7 FD |
425 | irq_work_sync(&event_notifier_group->wakeup_pending); |
426 | ||
6053e75e MD |
427 | ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table); |
428 | WARN_ON(ret); | |
8a8ac9a8 | 429 | |
dffef45d FD |
430 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
431 | &event_notifier_group->enablers_head, node) | |
44b1abdc | 432 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); |
dffef45d | 433 | |
a67ba386 MD |
434 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
435 | &event_notifier_group->event_notifiers_head, node) | |
0648898e | 436 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 437 | |
99f52fcc FD |
438 | if (event_notifier_group->error_counter) { |
439 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 440 | |
99f52fcc FD |
441 | error_counter->ops->counter_destroy(error_counter->counter); |
442 | module_put(error_counter->transport->owner); | |
443 | lttng_kvfree(error_counter); | |
444 | event_notifier_group->error_counter = NULL; | |
445 | } | |
446 | ||
4a399b76 | 447 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
448 | module_put(event_notifier_group->transport->owner); |
449 | list_del(&event_notifier_group->node); | |
dffef45d | 450 | |
750b05f2 FD |
451 | mutex_unlock(&sessions_mutex); |
452 | lttng_kvfree(event_notifier_group); | |
453 | } | |
454 | ||
8cdc1a81 | 455 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
456 | { |
457 | int ret; | |
458 | ||
459 | mutex_lock(&sessions_mutex); | |
460 | ret = lttng_statedump_start(session); | |
461 | mutex_unlock(&sessions_mutex); | |
462 | return ret; | |
463 | } | |
464 | ||
8cdc1a81 | 465 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
466 | { |
467 | int ret = 0; | |
f7d06400 | 468 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
469 | |
470 | mutex_lock(&sessions_mutex); | |
471 | if (session->active) { | |
472 | ret = -EBUSY; | |
473 | goto end; | |
474 | } | |
c099397a | 475 | |
3c997079 | 476 | /* Set transient enabler state to "enabled" */ |
8cdc1a81 | 477 | session->priv->tstate = 1; |
3c997079 | 478 | |
4ef81e4a | 479 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 480 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 481 | |
c099397a MD |
482 | /* |
483 | * Snapshot the number of events per channel to know the type of header | |
484 | * we need to use. | |
485 | */ | |
f7d06400 MD |
486 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
487 | if (chan_priv->header_type) | |
488 | continue; /* don't change it if session stop/restart */ | |
489 | if (chan_priv->free_event_id < 31) | |
490 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 491 | else |
f7d06400 | 492 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
493 | } |
494 | ||
64af2437 | 495 | /* Clear each stream's quiescent state. */ |
f7d06400 MD |
496 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
497 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
498 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 499 | } |
64af2437 | 500 | |
a8f2d0c7 | 501 | WRITE_ONCE(session->active, 1); |
8cdc1a81 | 502 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 503 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 504 | if (ret) { |
a8f2d0c7 | 505 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
506 | goto end; |
507 | } | |
508 | ret = lttng_statedump_start(session); | |
360f38ea | 509 | if (ret) |
a8f2d0c7 | 510 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
511 | end: |
512 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 513 | return ret; |
c0e31d2e MD |
514 | } |
515 | ||
8cdc1a81 | 516 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
517 | { |
518 | int ret = 0; | |
f7d06400 | 519 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
520 | |
521 | mutex_lock(&sessions_mutex); | |
522 | if (!session->active) { | |
523 | ret = -EBUSY; | |
524 | goto end; | |
525 | } | |
a8f2d0c7 | 526 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
527 | |
528 | /* Set transient enabler state to "disabled" */ | |
8cdc1a81 | 529 | session->priv->tstate = 0; |
b2bc0bc8 | 530 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
531 | |
532 | /* Set each stream's quiescent state. */ | |
f7d06400 MD |
533 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
534 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
535 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 536 | } |
c0e31d2e MD |
537 | end: |
538 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 539 | return ret; |
c0e31d2e MD |
540 | } |
541 | ||
8cdc1a81 | 542 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
543 | { |
544 | int ret = 0; | |
f7d06400 | 545 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 546 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
8cdc1a81 | 547 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
548 | struct lttng_metadata_stream *stream; |
549 | ||
550 | mutex_lock(&sessions_mutex); | |
551 | if (!session->active) { | |
552 | ret = -EBUSY; | |
553 | goto end; | |
554 | } | |
555 | ||
556 | mutex_lock(&cache->lock); | |
557 | memset(cache->data, 0, cache->cache_alloc); | |
558 | cache->metadata_written = 0; | |
559 | cache->version++; | |
8cdc1a81 | 560 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
561 | stream->metadata_out = 0; |
562 | stream->metadata_in = 0; | |
563 | } | |
564 | mutex_unlock(&cache->lock); | |
565 | ||
8cdc1a81 | 566 | session->priv->metadata_dumped = 0; |
f7d06400 MD |
567 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
568 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
569 | } |
570 | ||
8cdc1a81 | 571 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 572 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
573 | } |
574 | ||
575 | ret = _lttng_session_metadata_statedump(session); | |
576 | ||
577 | end: | |
578 | mutex_unlock(&sessions_mutex); | |
579 | return ret; | |
580 | } | |
581 | ||
6b757027 MD |
582 | static |
583 | bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel) | |
584 | { | |
585 | struct lttng_kernel_channel_buffer *chan_buf; | |
586 | ||
587 | if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER) | |
588 | return false; | |
589 | chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent); | |
590 | if (chan_buf->priv->channel_type == METADATA_CHANNEL) | |
591 | return true; | |
592 | return false; | |
593 | } | |
594 | ||
595 | int lttng_channel_enable(struct lttng_kernel_channel_common *channel) | |
e64957da | 596 | { |
3c997079 | 597 | int ret = 0; |
e64957da | 598 | |
3c997079 | 599 | mutex_lock(&sessions_mutex); |
6b757027 | 600 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
601 | ret = -EPERM; |
602 | goto end; | |
603 | } | |
6b757027 | 604 | if (channel->enabled) { |
3c997079 MD |
605 | ret = -EEXIST; |
606 | goto end; | |
607 | } | |
608 | /* Set transient enabler state to "enabled" */ | |
6b757027 MD |
609 | channel->priv->tstate = 1; |
610 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 | 611 | /* Set atomically the state to "enabled" */ |
6b757027 | 612 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
613 | end: |
614 | mutex_unlock(&sessions_mutex); | |
615 | return ret; | |
e64957da MD |
616 | } |
617 | ||
6b757027 | 618 | int lttng_channel_disable(struct lttng_kernel_channel_common *channel) |
e64957da | 619 | { |
3c997079 | 620 | int ret = 0; |
e64957da | 621 | |
3c997079 | 622 | mutex_lock(&sessions_mutex); |
6b757027 | 623 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
624 | ret = -EPERM; |
625 | goto end; | |
626 | } | |
6b757027 | 627 | if (!channel->enabled) { |
3c997079 MD |
628 | ret = -EEXIST; |
629 | goto end; | |
630 | } | |
631 | /* Set atomically the state to "disabled" */ | |
6b757027 | 632 | WRITE_ONCE(channel->enabled, 0); |
3c997079 | 633 | /* Set transient enabler state to "enabled" */ |
6b757027 MD |
634 | channel->priv->tstate = 0; |
635 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 MD |
636 | end: |
637 | mutex_unlock(&sessions_mutex); | |
638 | return ret; | |
e64957da MD |
639 | } |
640 | ||
9d993668 | 641 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 642 | { |
3c997079 | 643 | int ret = 0; |
e64957da | 644 | |
3c997079 | 645 | mutex_lock(&sessions_mutex); |
9d993668 MD |
646 | switch (event->type) { |
647 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
648 | { | |
649 | struct lttng_kernel_event_recorder *event_recorder = | |
650 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
651 | ||
f7d06400 | 652 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
653 | ret = -EPERM; |
654 | goto end; | |
655 | } | |
a0493bef | 656 | break; |
9d993668 MD |
657 | } |
658 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
659 | switch (event->priv->instrumentation) { | |
660 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
661 | ret = -EINVAL; | |
662 | goto end; | |
663 | default: | |
664 | break; | |
665 | } | |
a0493bef MD |
666 | break; |
667 | default: | |
9d993668 | 668 | break; |
a0493bef | 669 | } |
e64957da | 670 | |
9d993668 | 671 | if (event->enabled) { |
3c997079 MD |
672 | ret = -EEXIST; |
673 | goto end; | |
674 | } | |
a67ba386 | 675 | switch (event->priv->instrumentation) { |
c190d76e MJ |
676 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
677 | lttng_fallthrough; | |
606828e4 | 678 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
679 | ret = -EINVAL; |
680 | break; | |
b4a75708 | 681 | |
c190d76e MJ |
682 | case LTTNG_KERNEL_ABI_KPROBE: |
683 | lttng_fallthrough; | |
606828e4 | 684 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 685 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 686 | break; |
b4a75708 | 687 | |
606828e4 | 688 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 689 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 690 | break; |
b4a75708 | 691 | |
c190d76e MJ |
692 | case LTTNG_KERNEL_ABI_FUNCTION: |
693 | lttng_fallthrough; | |
694 | case LTTNG_KERNEL_ABI_NOOP: | |
695 | lttng_fallthrough; | |
a0493bef MD |
696 | default: |
697 | WARN_ON_ONCE(1); | |
698 | ret = -EINVAL; | |
699 | } | |
3c997079 MD |
700 | end: |
701 | mutex_unlock(&sessions_mutex); | |
702 | return ret; | |
e64957da MD |
703 | } |
704 | ||
9d993668 | 705 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
706 | { |
707 | int ret = 0; | |
708 | ||
709 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
710 | switch (event->type) { |
711 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
712 | { | |
713 | struct lttng_kernel_event_recorder *event_recorder = | |
714 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
715 | ||
f7d06400 | 716 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
717 | ret = -EPERM; |
718 | goto end; | |
719 | } | |
b01155ba | 720 | break; |
9d993668 MD |
721 | } |
722 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
723 | switch (event->priv->instrumentation) { | |
724 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
725 | ret = -EINVAL; | |
726 | goto end; | |
727 | default: | |
728 | break; | |
729 | } | |
2b16f0c9 | 730 | break; |
dffef45d | 731 | default: |
9d993668 | 732 | break; |
dffef45d | 733 | } |
dffef45d | 734 | |
a67ba386 | 735 | if (!event->enabled) { |
dffef45d FD |
736 | ret = -EEXIST; |
737 | goto end; | |
738 | } | |
a67ba386 | 739 | switch (event->priv->instrumentation) { |
c190d76e MJ |
740 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
741 | lttng_fallthrough; | |
606828e4 | 742 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
743 | ret = -EINVAL; |
744 | break; | |
b4a75708 | 745 | |
c190d76e MJ |
746 | case LTTNG_KERNEL_ABI_KPROBE: |
747 | lttng_fallthrough; | |
606828e4 | 748 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 749 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 750 | break; |
b4a75708 | 751 | |
9d993668 MD |
752 | case LTTNG_KERNEL_ABI_KRETPROBE: |
753 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
754 | break; | |
755 | ||
c190d76e MJ |
756 | case LTTNG_KERNEL_ABI_FUNCTION: |
757 | lttng_fallthrough; | |
758 | case LTTNG_KERNEL_ABI_NOOP: | |
759 | lttng_fallthrough; | |
dffef45d FD |
760 | default: |
761 | WARN_ON_ONCE(1); | |
762 | ret = -EINVAL; | |
763 | } | |
764 | end: | |
765 | mutex_unlock(&sessions_mutex); | |
766 | return ret; | |
767 | } | |
768 | ||
4e252d1e | 769 | struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
770 | const char *transport_name, |
771 | void *buf_addr, | |
4e3c1b9b MD |
772 | size_t subbuf_size, size_t num_subbuf, |
773 | unsigned int switch_timer_interval, | |
d83004aa JD |
774 | unsigned int read_timer_interval, |
775 | enum channel_type channel_type) | |
4e3c1b9b | 776 | { |
f7d06400 MD |
777 | struct lttng_kernel_channel_buffer *chan; |
778 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 779 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
780 | |
781 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 782 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 783 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 784 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 785 | if (!transport) { |
5a15f70c | 786 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 787 | transport_name); |
c0e31d2e | 788 | goto notransport; |
f3d01b96 | 789 | } |
a33c9927 | 790 | if (!try_module_get(transport->owner)) { |
5a15f70c | 791 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
792 | goto notransport; |
793 | } | |
f7d06400 | 794 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 795 | if (!chan) |
c0e31d2e | 796 | goto nomem; |
f7d06400 MD |
797 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
798 | if (!chan_priv) | |
799 | goto nomem_priv; | |
800 | chan->priv = chan_priv; | |
801 | chan_priv->pub = chan; | |
802 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
803 | chan->parent.session = session; | |
804 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 805 | chan->ops = &transport->ops; |
125b4df4 MD |
806 | /* |
807 | * Note: the channel creation op already writes into the packet | |
808 | * headers. Therefore the "chan" information used as input | |
809 | * should be already accessible. | |
810 | */ | |
f7d06400 | 811 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
812 | chan, buf_addr, subbuf_size, num_subbuf, |
813 | switch_timer_interval, read_timer_interval); | |
f7d06400 | 814 | if (!chan->priv->rb_chan) |
f3d01b96 | 815 | goto create_error; |
f7d06400 MD |
816 | chan->priv->parent.tstate = 1; |
817 | chan->parent.enabled = 1; | |
818 | chan->priv->transport = transport; | |
819 | chan->priv->channel_type = channel_type; | |
820 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
821 | mutex_unlock(&sessions_mutex); |
822 | return chan; | |
823 | ||
f3d01b96 | 824 | create_error: |
f7d06400 MD |
825 | kfree(chan_priv); |
826 | nomem_priv: | |
f3d01b96 | 827 | kfree(chan); |
c0e31d2e | 828 | nomem: |
a33c9927 MD |
829 | if (transport) |
830 | module_put(transport->owner); | |
c0e31d2e | 831 | notransport: |
e5382b6d | 832 | active: |
4e3c1b9b MD |
833 | mutex_unlock(&sessions_mutex); |
834 | return NULL; | |
835 | } | |
836 | ||
837 | /* | |
d83004aa JD |
838 | * Only used internally at session destruction for per-cpu channels, and |
839 | * when metadata channel is released. | |
840 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 841 | */ |
aa7c23a9 | 842 | static |
f7d06400 | 843 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 844 | { |
f7d06400 MD |
845 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
846 | module_put(chan->priv->transport->owner); | |
847 | list_del(&chan->priv->node); | |
848 | lttng_kernel_destroy_context(chan->priv->ctx); | |
849 | kfree(chan->priv); | |
4e3c1b9b MD |
850 | kfree(chan); |
851 | } | |
852 | ||
f7d06400 | 853 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 854 | { |
f7d06400 | 855 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
856 | |
857 | /* Protect the metadata cache with the sessions_mutex. */ | |
858 | mutex_lock(&sessions_mutex); | |
859 | _lttng_channel_destroy(chan); | |
860 | mutex_unlock(&sessions_mutex); | |
861 | } | |
862 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
863 | ||
864 | static | |
865 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
866 | { | |
867 | stream->finalized = 1; | |
868 | wake_up_interruptible(&stream->read_wait); | |
869 | } | |
870 | ||
a101fa10 | 871 | |
e5382b6d MD |
872 | /* |
873 | * Supports event creation while tracing session is active. | |
3c997079 | 874 | * Needs to be called with sessions mutex held. |
e5382b6d | 875 | */ |
1ae083ba | 876 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler, |
def1e304 | 877 | const struct lttng_kernel_event_desc *event_desc) |
4e3c1b9b | 878 | { |
def1e304 | 879 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
5b9817ae | 880 | struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param; |
def1e304 | 881 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; |
f7d06400 | 882 | struct lttng_kernel_session *session = chan->parent.session; |
a67ba386 MD |
883 | struct lttng_kernel_event_recorder *event_recorder; |
884 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
885 | const char *event_name; |
886 | struct hlist_head *head; | |
3d084699 | 887 | int ret; |
4e3c1b9b | 888 | |
f7d06400 | 889 | if (chan->priv->free_event_id == -1U) { |
4cf0bf51 | 890 | ret = -EMFILE; |
e5382b6d | 891 | goto full; |
abc0446a | 892 | } |
3c997079 MD |
893 | |
894 | switch (itype) { | |
606828e4 | 895 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 896 | event_name = event_desc->event_name; |
3c997079 | 897 | break; |
b4a75708 | 898 | |
c190d76e MJ |
899 | case LTTNG_KERNEL_ABI_KPROBE: |
900 | lttng_fallthrough; | |
901 | case LTTNG_KERNEL_ABI_UPROBE: | |
902 | lttng_fallthrough; | |
903 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
904 | lttng_fallthrough; | |
606828e4 | 905 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
906 | event_name = event_param->name; |
907 | break; | |
b4a75708 | 908 | |
c190d76e MJ |
909 | case LTTNG_KERNEL_ABI_FUNCTION: |
910 | lttng_fallthrough; | |
911 | case LTTNG_KERNEL_ABI_NOOP: | |
912 | lttng_fallthrough; | |
3c997079 MD |
913 | default: |
914 | WARN_ON_ONCE(1); | |
915 | ret = -EINVAL; | |
916 | goto type_error; | |
917 | } | |
4a11ef1c | 918 | |
8cdc1a81 | 919 | head = utils_borrow_hash_table_bucket(session->priv->events_ht.table, |
4a11ef1c | 920 | LTTNG_EVENT_HT_SIZE, event_name); |
a67ba386 MD |
921 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
922 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
923 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 924 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 925 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
926 | ret = -EEXIST; |
927 | goto exist; | |
abc0446a MD |
928 | } |
929 | } | |
3c997079 | 930 | |
a67ba386 MD |
931 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
932 | if (!event_recorder) { | |
4cf0bf51 | 933 | ret = -ENOMEM; |
4e3c1b9b | 934 | goto cache_error; |
abc0446a | 935 | } |
a67ba386 MD |
936 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
937 | if (!event_recorder_priv) { | |
938 | ret = -ENOMEM; | |
939 | goto cache_private_error; | |
940 | } | |
941 | event_recorder_priv->pub = event_recorder; | |
942 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
943 | event_recorder->priv = event_recorder_priv; | |
944 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
945 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
946 | ||
8a445457 | 947 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 948 | event_recorder->chan = chan; |
f7d06400 | 949 | event_recorder->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
950 | event_recorder->priv->parent.instrumentation = itype; |
951 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
952 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
953 | |
954 | switch (itype) { | |
606828e4 | 955 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 956 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
957 | event_recorder->parent.enabled = 0; |
958 | event_recorder->priv->parent.registered = 0; | |
959 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
960 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 961 | ret = -ENOENT; |
d3dbe23c | 962 | goto register_error; |
abc0446a | 963 | } |
3c997079 MD |
964 | /* Populate lttng_event structure before event registration. */ |
965 | smp_wmb(); | |
baf20995 | 966 | break; |
b4a75708 | 967 | |
606828e4 | 968 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
969 | /* |
970 | * Needs to be explicitly enabled after creation, since | |
971 | * we may want to apply filters. | |
972 | */ | |
a67ba386 MD |
973 | event_recorder->parent.enabled = 0; |
974 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
975 | /* |
976 | * Populate lttng_event structure before event | |
977 | * registration. | |
978 | */ | |
979 | smp_wmb(); | |
8bf17deb | 980 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
981 | event_param->u.kprobe.symbol_name, |
982 | event_param->u.kprobe.offset, | |
983 | event_param->u.kprobe.addr, | |
6a35e5bd | 984 | &event_recorder->parent); |
abc0446a | 985 | if (ret) { |
4cf0bf51 | 986 | ret = -EINVAL; |
d6d808f3 | 987 | goto register_error; |
abc0446a | 988 | } |
a67ba386 | 989 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 990 | WARN_ON_ONCE(!ret); |
d6d808f3 | 991 | break; |
b4a75708 | 992 | |
606828e4 | 993 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 994 | { |
a67ba386 MD |
995 | struct lttng_kernel_event_recorder *event_recorder_return; |
996 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
997 | |
998 | /* kretprobe defines 2 events */ | |
a0493bef MD |
999 | /* |
1000 | * Needs to be explicitly enabled after creation, since | |
1001 | * we may want to apply filters. | |
1002 | */ | |
a67ba386 MD |
1003 | event_recorder->parent.enabled = 0; |
1004 | event_recorder->priv->parent.registered = 1; | |
1005 | ||
1006 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
1007 | if (!event_recorder_return) { | |
1008 | ret = -ENOMEM; | |
1009 | goto register_error; | |
1010 | } | |
1011 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
1012 | if (!event_recorder_return_priv) { | |
1013 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1014 | ret = -ENOMEM; |
7371f44c | 1015 | goto register_error; |
abc0446a | 1016 | } |
a67ba386 MD |
1017 | event_recorder_return_priv->pub = event_recorder_return; |
1018 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
1019 | event_recorder_return->priv = event_recorder_return_priv; | |
1020 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
1021 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
1022 | ||
8a445457 | 1023 | event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 1024 | event_recorder_return->chan = chan; |
f7d06400 | 1025 | event_recorder_return->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
1026 | event_recorder_return->priv->parent.instrumentation = itype; |
1027 | event_recorder_return->parent.enabled = 0; | |
1028 | event_recorder_return->priv->parent.registered = 1; | |
1029 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
1030 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 1031 | /* |
a90917c3 | 1032 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1033 | */ |
1034 | smp_wmb(); | |
3c997079 | 1035 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1036 | event_param->u.kretprobe.symbol_name, |
1037 | event_param->u.kretprobe.offset, | |
1038 | event_param->u.kretprobe.addr, | |
eb6b47db | 1039 | &event_recorder->parent, &event_recorder_return->parent); |
7371f44c | 1040 | if (ret) { |
a67ba386 MD |
1041 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1042 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1043 | ret = -EINVAL; |
7371f44c MD |
1044 | goto register_error; |
1045 | } | |
1046 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1047 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1048 | WARN_ON_ONCE(!ret); |
a67ba386 | 1049 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1050 | WARN_ON_ONCE(!ret); |
f7d06400 | 1051 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, |
a67ba386 | 1052 | event_recorder_return); |
abc0446a | 1053 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1054 | if (ret) { |
a67ba386 MD |
1055 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1056 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
1057 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1058 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1059 | goto statedump_error; |
1060 | } | |
f7d06400 | 1061 | list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events); |
7371f44c MD |
1062 | break; |
1063 | } | |
b4a75708 | 1064 | |
606828e4 | 1065 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1066 | /* |
1067 | * Needs to be explicitly enabled after creation, since | |
1068 | * we may want to apply filters. | |
1069 | */ | |
a67ba386 MD |
1070 | event_recorder->parent.enabled = 0; |
1071 | event_recorder->priv->parent.registered = 0; | |
1072 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1073 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1074 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1075 | ret = -EINVAL; |
1076 | goto register_error; | |
606828e4 | 1077 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1078 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1079 | break; |
606828e4 | 1080 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1081 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1082 | break; |
1083 | } | |
1084 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1085 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1086 | ret = -EINVAL; |
1087 | goto register_error; | |
606828e4 | 1088 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1089 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1090 | break; |
606828e4 | 1091 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1092 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1093 | break; |
1094 | } | |
a67ba386 | 1095 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1096 | ret = -EINVAL; |
259b6cb3 | 1097 | goto register_error; |
abc0446a | 1098 | } |
1ec65de1 | 1099 | break; |
b4a75708 | 1100 | |
606828e4 | 1101 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1102 | /* |
1103 | * Needs to be explicitly enabled after creation, since | |
1104 | * we may want to apply filters. | |
1105 | */ | |
a67ba386 MD |
1106 | event_recorder->parent.enabled = 0; |
1107 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1108 | |
a344f64b FD |
1109 | /* |
1110 | * Populate lttng_event structure before event | |
1111 | * registration. | |
1112 | */ | |
1113 | smp_wmb(); | |
149b9a9d | 1114 | |
83b802dc | 1115 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1116 | event_param->u.uprobe.fd, |
17806c46 | 1117 | &event_recorder->parent); |
149b9a9d YB |
1118 | if (ret) |
1119 | goto register_error; | |
a67ba386 | 1120 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1121 | WARN_ON_ONCE(!ret); |
1122 | break; | |
b4a75708 | 1123 | |
c190d76e MJ |
1124 | case LTTNG_KERNEL_ABI_FUNCTION: |
1125 | lttng_fallthrough; | |
1126 | case LTTNG_KERNEL_ABI_NOOP: | |
1127 | lttng_fallthrough; | |
baf20995 MD |
1128 | default: |
1129 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1130 | ret = -EINVAL; |
df07930b | 1131 | goto register_error; |
baf20995 | 1132 | } |
f7d06400 | 1133 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder); |
abc0446a MD |
1134 | WARN_ON_ONCE(ret > 0); |
1135 | if (ret) { | |
c099397a | 1136 | goto statedump_error; |
abc0446a | 1137 | } |
a67ba386 | 1138 | hlist_add_head(&event_recorder->priv->hlist, head); |
f7d06400 | 1139 | list_add(&event_recorder->priv->node, &chan->parent.session->priv->events); |
a67ba386 | 1140 | return event_recorder; |
4e3c1b9b | 1141 | |
c099397a | 1142 | statedump_error: |
259b6cb3 | 1143 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1144 | register_error: |
a67ba386 MD |
1145 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1146 | cache_private_error: | |
1147 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1148 | cache_error: |
1149 | exist: | |
3c997079 | 1150 | type_error: |
e5382b6d | 1151 | full: |
4cf0bf51 | 1152 | return ERR_PTR(ret); |
4e3c1b9b MD |
1153 | } |
1154 | ||
a67ba386 | 1155 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1156 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1157 | uint64_t token, uint64_t error_counter_index, |
1158 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1159 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1160 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1161 | { |
a67ba386 MD |
1162 | struct lttng_kernel_event_notifier *event_notifier; |
1163 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1164 | struct lttng_counter *error_counter; |
dffef45d FD |
1165 | const char *event_name; |
1166 | struct hlist_head *head; | |
1167 | int ret; | |
1168 | ||
1169 | switch (itype) { | |
606828e4 | 1170 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1171 | event_name = event_desc->event_name; |
b01155ba | 1172 | break; |
b4a75708 | 1173 | |
c190d76e MJ |
1174 | case LTTNG_KERNEL_ABI_KPROBE: |
1175 | lttng_fallthrough; | |
1176 | case LTTNG_KERNEL_ABI_UPROBE: | |
1177 | lttng_fallthrough; | |
606828e4 | 1178 | case LTTNG_KERNEL_ABI_SYSCALL: |
2b16f0c9 FD |
1179 | event_name = event_notifier_param->event.name; |
1180 | break; | |
b4a75708 | 1181 | |
c190d76e MJ |
1182 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1183 | lttng_fallthrough; | |
1184 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1185 | lttng_fallthrough; | |
1186 | case LTTNG_KERNEL_ABI_NOOP: | |
1187 | lttng_fallthrough; | |
dffef45d FD |
1188 | default: |
1189 | WARN_ON_ONCE(1); | |
1190 | ret = -EINVAL; | |
1191 | goto type_error; | |
1192 | } | |
1193 | ||
1194 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1195 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
a67ba386 MD |
1196 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1197 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1198 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1199 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1200 | && event_notifier_group == event_notifier_priv->group |
1201 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1202 | ret = -EEXIST; |
1203 | goto exist; | |
1204 | } | |
1205 | } | |
1206 | ||
1207 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1208 | if (!event_notifier) { | |
1209 | ret = -ENOMEM; | |
1210 | goto cache_error; | |
1211 | } | |
a67ba386 MD |
1212 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1213 | if (!event_notifier_priv) { | |
1214 | ret = -ENOMEM; | |
1215 | goto cache_private_error; | |
1216 | } | |
1217 | event_notifier_priv->pub = event_notifier; | |
1218 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1219 | event_notifier->priv = event_notifier_priv; | |
1220 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1221 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1222 | ||
1223 | event_notifier->priv->group = event_notifier_group; | |
1224 | event_notifier->priv->parent.user_token = token; | |
1225 | event_notifier->priv->error_counter_index = error_counter_index; | |
1226 | event_notifier->priv->num_captures = 0; | |
1227 | event_notifier->priv->parent.instrumentation = itype; | |
1228 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1229 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1230 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1231 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
8a445457 | 1232 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; |
dffef45d FD |
1233 | |
1234 | switch (itype) { | |
606828e4 | 1235 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1236 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1237 | event_notifier->parent.enabled = 0; |
1238 | event_notifier->priv->parent.registered = 0; | |
1239 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1240 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1241 | ret = -ENOENT; |
1242 | goto register_error; | |
1243 | } | |
1244 | /* Populate lttng_event_notifier structure before event registration. */ | |
1245 | smp_wmb(); | |
1246 | break; | |
b4a75708 | 1247 | |
606828e4 | 1248 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1249 | /* |
1250 | * Needs to be explicitly enabled after creation, since | |
1251 | * we may want to apply filters. | |
1252 | */ | |
a67ba386 MD |
1253 | event_notifier->parent.enabled = 0; |
1254 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1255 | /* |
1256 | * Populate lttng_event_notifier structure before event | |
1257 | * registration. | |
1258 | */ | |
1259 | smp_wmb(); | |
6a35e5bd | 1260 | ret = lttng_kprobes_register_event(event_notifier_param->event.u.kprobe.symbol_name, |
2b16f0c9 FD |
1261 | event_notifier_param->event.u.kprobe.symbol_name, |
1262 | event_notifier_param->event.u.kprobe.offset, | |
1263 | event_notifier_param->event.u.kprobe.addr, | |
6a35e5bd | 1264 | &event_notifier->parent); |
2b16f0c9 FD |
1265 | if (ret) { |
1266 | ret = -EINVAL; | |
1267 | goto register_error; | |
1268 | } | |
a67ba386 | 1269 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1270 | WARN_ON_ONCE(!ret); |
1271 | break; | |
b4a75708 | 1272 | |
606828e4 | 1273 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1274 | /* |
1275 | * Needs to be explicitly enabled after creation, since | |
1276 | * we may want to apply filters. | |
1277 | */ | |
a67ba386 MD |
1278 | event_notifier->parent.enabled = 0; |
1279 | event_notifier->priv->parent.registered = 0; | |
1280 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1281 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1282 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1283 | ret = -EINVAL; |
1284 | goto register_error; | |
606828e4 | 1285 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1286 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1287 | break; |
606828e4 | 1288 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1289 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1290 | break; |
1291 | } | |
1292 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1293 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1294 | ret = -EINVAL; |
1295 | goto register_error; | |
606828e4 | 1296 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1297 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1298 | break; |
606828e4 | 1299 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1300 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1301 | break; |
1302 | } | |
1303 | ||
a67ba386 | 1304 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1305 | ret = -EINVAL; |
1306 | goto register_error; | |
1307 | } | |
1308 | break; | |
b4a75708 | 1309 | |
606828e4 | 1310 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1311 | /* |
1312 | * Needs to be explicitly enabled after creation, since | |
1313 | * we may want to apply filters. | |
1314 | */ | |
a67ba386 MD |
1315 | event_notifier->parent.enabled = 0; |
1316 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1317 | |
1318 | /* | |
1319 | * Populate lttng_event_notifier structure before | |
1320 | * event_notifier registration. | |
1321 | */ | |
1322 | smp_wmb(); | |
1323 | ||
17806c46 | 1324 | ret = lttng_uprobes_register_event(event_notifier_param->event.name, |
9de67196 | 1325 | event_notifier_param->event.u.uprobe.fd, |
17806c46 | 1326 | &event_notifier->parent); |
9de67196 FD |
1327 | if (ret) |
1328 | goto register_error; | |
a67ba386 | 1329 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1330 | WARN_ON_ONCE(!ret); |
1331 | break; | |
b4a75708 | 1332 | |
c190d76e MJ |
1333 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1334 | lttng_fallthrough; | |
1335 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1336 | lttng_fallthrough; | |
1337 | case LTTNG_KERNEL_ABI_NOOP: | |
1338 | lttng_fallthrough; | |
dffef45d FD |
1339 | default: |
1340 | WARN_ON_ONCE(1); | |
1341 | ret = -EINVAL; | |
1342 | goto register_error; | |
1343 | } | |
1344 | ||
a67ba386 MD |
1345 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1346 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1347 | |
1348 | /* | |
1349 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1350 | * bucket is currently in use. We trust it. The session lock |
1351 | * synchronizes against concurrent creation of the error | |
1352 | * counter. | |
99f52fcc | 1353 | */ |
ab04d7b1 MD |
1354 | error_counter = event_notifier_group->error_counter; |
1355 | if (error_counter) { | |
99f52fcc FD |
1356 | size_t dimension_index[1]; |
1357 | ||
1358 | /* | |
1359 | * Check that the index is within the boundary of the counter. | |
1360 | */ | |
a67ba386 | 1361 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1362 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1363 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1364 | ret = -EINVAL; |
1365 | goto register_error; | |
1366 | } | |
1367 | ||
a67ba386 | 1368 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1369 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1370 | if (ret) { |
1371 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1372 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1373 | goto register_error; |
1374 | } | |
1375 | } | |
1376 | ||
dffef45d FD |
1377 | return event_notifier; |
1378 | ||
1379 | register_error: | |
a67ba386 MD |
1380 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1381 | cache_private_error: | |
dffef45d FD |
1382 | kmem_cache_free(event_notifier_cache, event_notifier); |
1383 | cache_error: | |
1384 | exist: | |
1385 | type_error: | |
1386 | return ERR_PTR(ret); | |
1387 | } | |
1388 | ||
99f52fcc FD |
1389 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1390 | const size_t *dim_indexes, int32_t cpu, | |
1391 | int64_t *val, bool *overflow, bool *underflow) | |
1392 | { | |
1393 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1394 | cpu, val, overflow, underflow); | |
1395 | } | |
1396 | ||
1397 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1398 | const size_t *dim_indexes, int64_t *val, | |
1399 | bool *overflow, bool *underflow) | |
1400 | { | |
1401 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1402 | val, overflow, underflow); | |
1403 | } | |
1404 | ||
1405 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1406 | const size_t *dim_indexes) | |
1407 | { | |
1408 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1409 | } | |
1410 | ||
1ae083ba | 1411 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler, |
def1e304 | 1412 | const struct lttng_kernel_event_desc *event_desc) |
3c997079 | 1413 | { |
a67ba386 | 1414 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1415 | |
1416 | mutex_lock(&sessions_mutex); | |
def1e304 | 1417 | event = _lttng_kernel_event_recorder_create(event_enabler, event_desc); |
3c997079 MD |
1418 | mutex_unlock(&sessions_mutex); |
1419 | return event; | |
1420 | } | |
1421 | ||
a67ba386 | 1422 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1423 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1424 | uint64_t id, uint64_t error_counter_index, |
1425 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1426 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1427 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1428 | { |
a67ba386 | 1429 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1430 | |
1431 | mutex_lock(&sessions_mutex); | |
1432 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1433 | error_counter_index, event_notifier_group, |
a67ba386 | 1434 | event_notifier_param, itype); |
dffef45d FD |
1435 | mutex_unlock(&sessions_mutex); |
1436 | return event_notifier; | |
1437 | } | |
1438 | ||
3c997079 MD |
1439 | /* Only used for tracepoints for now. */ |
1440 | static | |
0c851fa0 | 1441 | void register_event(struct lttng_kernel_event_common *event) |
3c997079 | 1442 | { |
437d5aa5 | 1443 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1444 | int ret = -EINVAL; |
3c997079 | 1445 | |
0c851fa0 | 1446 | if (event->priv->registered) |
3c997079 | 1447 | return; |
4ecb5ad5 | 1448 | |
0c851fa0 MD |
1449 | desc = event->priv->desc; |
1450 | switch (event->priv->instrumentation) { | |
606828e4 | 1451 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1452 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1453 | desc->tp_class->probe_callback, |
0c851fa0 | 1454 | event); |
4ecb5ad5 | 1455 | break; |
b4a75708 | 1456 | |
606828e4 | 1457 | case LTTNG_KERNEL_ABI_SYSCALL: |
0c851fa0 | 1458 | ret = lttng_syscall_filter_enable_event(event); |
4ecb5ad5 | 1459 | break; |
b4a75708 | 1460 | |
c190d76e MJ |
1461 | case LTTNG_KERNEL_ABI_KPROBE: |
1462 | lttng_fallthrough; | |
1463 | case LTTNG_KERNEL_ABI_UPROBE: | |
4ecb5ad5 | 1464 | ret = 0; |
0c851fa0 MD |
1465 | |
1466 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1467 | switch (event->type) { | |
1468 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1469 | ret = 0; | |
1470 | break; | |
1471 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1472 | WARN_ON_ONCE(1); | |
1473 | break; | |
1474 | } | |
4ecb5ad5 | 1475 | break; |
b4a75708 | 1476 | |
c190d76e MJ |
1477 | case LTTNG_KERNEL_ABI_FUNCTION: |
1478 | lttng_fallthrough; | |
1479 | case LTTNG_KERNEL_ABI_NOOP: | |
1480 | lttng_fallthrough; | |
4ecb5ad5 MD |
1481 | default: |
1482 | WARN_ON_ONCE(1); | |
1483 | } | |
3c997079 | 1484 | if (!ret) |
0c851fa0 | 1485 | event->priv->registered = 1; |
3c997079 MD |
1486 | } |
1487 | ||
4e3c1b9b MD |
1488 | /* |
1489 | * Only used internally at session destruction. | |
1490 | */ | |
96c59af1 | 1491 | int _lttng_event_recorder_unregister(struct lttng_kernel_event_recorder *event_recorder) |
4e3c1b9b | 1492 | { |
a67ba386 | 1493 | struct lttng_kernel_event_common_private *event_priv = &event_recorder->priv->parent; |
437d5aa5 | 1494 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1495 | int ret = -EINVAL; |
1496 | ||
a67ba386 | 1497 | if (!event_priv->registered) |
3c997079 MD |
1498 | return 0; |
1499 | ||
a67ba386 MD |
1500 | desc = event_priv->desc; |
1501 | switch (event_priv->instrumentation) { | |
606828e4 | 1502 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1503 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1504 | event_priv->desc->tp_class->probe_callback, |
14a15bad | 1505 | &event_recorder->parent); |
baf20995 | 1506 | break; |
b4a75708 | 1507 | |
606828e4 | 1508 | case LTTNG_KERNEL_ABI_KPROBE: |
6a35e5bd | 1509 | lttng_kprobes_unregister_event(&event_recorder->parent); |
d6d808f3 MD |
1510 | ret = 0; |
1511 | break; | |
b4a75708 | 1512 | |
606828e4 | 1513 | case LTTNG_KERNEL_ABI_KRETPROBE: |
eb6b47db | 1514 | lttng_kretprobes_unregister(&event_recorder->parent); |
7371f44c MD |
1515 | ret = 0; |
1516 | break; | |
b4a75708 | 1517 | |
606828e4 | 1518 | case LTTNG_KERNEL_ABI_SYSCALL: |
9b2f1c54 | 1519 | ret = lttng_syscall_filter_disable_event(&event_recorder->parent); |
4ecb5ad5 | 1520 | break; |
b4a75708 | 1521 | |
606828e4 | 1522 | case LTTNG_KERNEL_ABI_NOOP: |
259b6cb3 MD |
1523 | ret = 0; |
1524 | break; | |
b4a75708 | 1525 | |
606828e4 | 1526 | case LTTNG_KERNEL_ABI_UPROBE: |
17806c46 | 1527 | lttng_uprobes_unregister_event(&event_recorder->parent); |
149b9a9d YB |
1528 | ret = 0; |
1529 | break; | |
b4a75708 | 1530 | |
c190d76e MJ |
1531 | case LTTNG_KERNEL_ABI_FUNCTION: |
1532 | lttng_fallthrough; | |
baf20995 MD |
1533 | default: |
1534 | WARN_ON_ONCE(1); | |
1535 | } | |
3c997079 | 1536 | if (!ret) |
a67ba386 | 1537 | event_priv->registered = 0; |
dda6a249 MD |
1538 | return ret; |
1539 | } | |
1540 | ||
dffef45d FD |
1541 | static |
1542 | int _lttng_event_notifier_unregister( | |
a67ba386 | 1543 | struct lttng_kernel_event_notifier *event_notifier) |
dffef45d | 1544 | { |
437d5aa5 | 1545 | const struct lttng_kernel_event_desc *desc; |
dffef45d FD |
1546 | int ret = -EINVAL; |
1547 | ||
a67ba386 | 1548 | if (!event_notifier->priv->parent.registered) |
dffef45d FD |
1549 | return 0; |
1550 | ||
a67ba386 MD |
1551 | desc = event_notifier->priv->parent.desc; |
1552 | switch (event_notifier->priv->parent.instrumentation) { | |
606828e4 | 1553 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1554 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->priv->parent.desc->event_kname, |
6c8c025b | 1555 | event_notifier->priv->parent.desc->tp_class->probe_callback, |
14a15bad | 1556 | &event_notifier->parent); |
b01155ba | 1557 | break; |
b4a75708 | 1558 | |
606828e4 | 1559 | case LTTNG_KERNEL_ABI_KPROBE: |
6a35e5bd | 1560 | lttng_kprobes_unregister_event(&event_notifier->parent); |
2b16f0c9 FD |
1561 | ret = 0; |
1562 | break; | |
b4a75708 | 1563 | |
606828e4 | 1564 | case LTTNG_KERNEL_ABI_UPROBE: |
17806c46 | 1565 | lttng_uprobes_unregister_event(&event_notifier->parent); |
9de67196 FD |
1566 | ret = 0; |
1567 | break; | |
b4a75708 | 1568 | |
606828e4 | 1569 | case LTTNG_KERNEL_ABI_SYSCALL: |
9b2f1c54 | 1570 | ret = lttng_syscall_filter_disable_event(&event_notifier->parent); |
8a8ac9a8 | 1571 | break; |
b4a75708 | 1572 | |
c190d76e MJ |
1573 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1574 | lttng_fallthrough; | |
1575 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1576 | lttng_fallthrough; | |
1577 | case LTTNG_KERNEL_ABI_NOOP: | |
1578 | lttng_fallthrough; | |
dffef45d FD |
1579 | default: |
1580 | WARN_ON_ONCE(1); | |
1581 | } | |
1582 | if (!ret) | |
a67ba386 | 1583 | event_notifier->priv->parent.registered = 0; |
dffef45d FD |
1584 | return ret; |
1585 | } | |
1586 | ||
dda6a249 MD |
1587 | /* |
1588 | * Only used internally at session destruction. | |
1589 | */ | |
be066e6c | 1590 | static |
0648898e | 1591 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1592 | { |
0648898e | 1593 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1594 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1595 | ||
0648898e MD |
1596 | lttng_free_event_filter_runtime(event); |
1597 | /* Free event enabler refs */ | |
1598 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1599 | &event_priv->enablers_ref_head, node) | |
1600 | kfree(enabler_ref); | |
b4a75708 | 1601 | |
0648898e MD |
1602 | switch (event->type) { |
1603 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1604 | { | |
1605 | struct lttng_kernel_event_recorder *event_recorder = | |
1606 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1607 | |
0648898e MD |
1608 | switch (event_priv->instrumentation) { |
1609 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1610 | lttng_event_desc_put(event_priv->desc); | |
1611 | break; | |
b4a75708 | 1612 | |
0648898e MD |
1613 | case LTTNG_KERNEL_ABI_KPROBE: |
1614 | module_put(event_priv->desc->owner); | |
6a35e5bd | 1615 | lttng_kprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1616 | break; |
b4a75708 | 1617 | |
0648898e MD |
1618 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1619 | module_put(event_priv->desc->owner); | |
eb6b47db | 1620 | lttng_kretprobes_destroy_private(&event_recorder->parent); |
0648898e | 1621 | break; |
b4a75708 | 1622 | |
0648898e MD |
1623 | case LTTNG_KERNEL_ABI_SYSCALL: |
1624 | break; | |
4e3c1b9b | 1625 | |
0648898e MD |
1626 | case LTTNG_KERNEL_ABI_UPROBE: |
1627 | module_put(event_priv->desc->owner); | |
17806c46 | 1628 | lttng_uprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1629 | break; |
3ef5cc03 | 1630 | |
c190d76e MJ |
1631 | case LTTNG_KERNEL_ABI_FUNCTION: |
1632 | lttng_fallthrough; | |
1633 | case LTTNG_KERNEL_ABI_NOOP: | |
1634 | lttng_fallthrough; | |
0648898e MD |
1635 | default: |
1636 | WARN_ON_ONCE(1); | |
1637 | } | |
1638 | list_del(&event_recorder->priv->node); | |
1639 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1640 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1641 | break; |
0648898e MD |
1642 | } |
1643 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1644 | { | |
1645 | struct lttng_kernel_event_notifier *event_notifier = | |
1646 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1647 | |
0648898e MD |
1648 | switch (event_notifier->priv->parent.instrumentation) { |
1649 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1650 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1651 | break; | |
b4a75708 | 1652 | |
0648898e MD |
1653 | case LTTNG_KERNEL_ABI_KPROBE: |
1654 | module_put(event_notifier->priv->parent.desc->owner); | |
6a35e5bd | 1655 | lttng_kprobes_destroy_event_private(&event_notifier->parent); |
0648898e | 1656 | break; |
b4a75708 | 1657 | |
0648898e MD |
1658 | case LTTNG_KERNEL_ABI_SYSCALL: |
1659 | break; | |
b4a75708 | 1660 | |
0648898e MD |
1661 | case LTTNG_KERNEL_ABI_UPROBE: |
1662 | module_put(event_notifier->priv->parent.desc->owner); | |
17806c46 | 1663 | lttng_uprobes_destroy_event_private(&event_notifier->parent); |
0648898e MD |
1664 | break; |
1665 | ||
c190d76e MJ |
1666 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1667 | lttng_fallthrough; | |
1668 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1669 | lttng_fallthrough; | |
1670 | case LTTNG_KERNEL_ABI_NOOP: | |
1671 | lttng_fallthrough; | |
0648898e MD |
1672 | default: |
1673 | WARN_ON_ONCE(1); | |
1674 | } | |
1675 | list_del(&event_notifier->priv->node); | |
1676 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1677 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1678 | break; | |
1679 | } | |
dffef45d FD |
1680 | default: |
1681 | WARN_ON_ONCE(1); | |
1682 | } | |
dffef45d FD |
1683 | } |
1684 | ||
8c0393c3 | 1685 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1686 | enum tracker_type tracker_type) |
e0130fab | 1687 | { |
d1f652f8 MD |
1688 | switch (tracker_type) { |
1689 | case TRACKER_PID: | |
1690 | return &session->pid_tracker; | |
1691 | case TRACKER_VPID: | |
1692 | return &session->vpid_tracker; | |
1693 | case TRACKER_UID: | |
1694 | return &session->uid_tracker; | |
1695 | case TRACKER_VUID: | |
1696 | return &session->vuid_tracker; | |
1697 | case TRACKER_GID: | |
1698 | return &session->gid_tracker; | |
1699 | case TRACKER_VGID: | |
1700 | return &session->vgid_tracker; | |
1701 | default: | |
1702 | WARN_ON_ONCE(1); | |
1703 | return NULL; | |
1704 | } | |
1705 | } | |
1706 | ||
8cdc1a81 | 1707 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1708 | enum tracker_type tracker_type, int id) |
1709 | { | |
8c0393c3 | 1710 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1711 | int ret; |
1712 | ||
d1f652f8 MD |
1713 | tracker = get_tracker(session, tracker_type); |
1714 | if (!tracker) | |
1715 | return -EINVAL; | |
1716 | if (id < -1) | |
e0130fab MD |
1717 | return -EINVAL; |
1718 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1719 | if (id == -1) { |
1720 | /* track all ids: destroy tracker. */ | |
1721 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1722 | ret = 0; |
1723 | } else { | |
d1f652f8 | 1724 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1725 | } |
e0130fab MD |
1726 | mutex_unlock(&sessions_mutex); |
1727 | return ret; | |
1728 | } | |
1729 | ||
8cdc1a81 | 1730 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1731 | enum tracker_type tracker_type, int id) |
e0130fab | 1732 | { |
8c0393c3 | 1733 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1734 | int ret; |
1735 | ||
d1f652f8 MD |
1736 | tracker = get_tracker(session, tracker_type); |
1737 | if (!tracker) | |
1738 | return -EINVAL; | |
1739 | if (id < -1) | |
e0130fab MD |
1740 | return -EINVAL; |
1741 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1742 | if (id == -1) { |
1743 | /* untrack all ids: replace by empty tracker. */ | |
1744 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1745 | } else { |
d1f652f8 | 1746 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1747 | } |
e0130fab MD |
1748 | mutex_unlock(&sessions_mutex); |
1749 | return ret; | |
1750 | } | |
1751 | ||
7e6f9ef6 | 1752 | static |
d1f652f8 | 1753 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1754 | { |
8c0393c3 MD |
1755 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1756 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1757 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1758 | int iter = 0, i; |
1759 | ||
1760 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1761 | if (id_tracker_p) { |
1762 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1763 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1764 | |
f934e302 | 1765 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1766 | if (iter++ >= *pos) |
1767 | return e; | |
1768 | } | |
1769 | } | |
1770 | } else { | |
d1f652f8 | 1771 | /* ID tracker disabled. */ |
7e6f9ef6 | 1772 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1773 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1774 | } |
1775 | iter++; | |
1776 | } | |
1777 | /* End of list */ | |
1778 | return NULL; | |
1779 | } | |
1780 | ||
1781 | /* Called with sessions_mutex held. */ | |
1782 | static | |
d1f652f8 | 1783 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1784 | { |
8c0393c3 MD |
1785 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1786 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1787 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1788 | int iter = 0, i; |
1789 | ||
1790 | (*ppos)++; | |
d1f652f8 MD |
1791 | if (id_tracker_p) { |
1792 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1793 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1794 | |
f934e302 | 1795 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1796 | if (iter++ >= *ppos) |
1797 | return e; | |
1798 | } | |
1799 | } | |
1800 | } else { | |
d1f652f8 | 1801 | /* ID tracker disabled. */ |
7e6f9ef6 | 1802 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1803 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1804 | iter++; |
1805 | } | |
1806 | ||
1807 | /* End of list */ | |
1808 | return NULL; | |
1809 | } | |
1810 | ||
1811 | static | |
d1f652f8 | 1812 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1813 | { |
1814 | mutex_unlock(&sessions_mutex); | |
1815 | } | |
1816 | ||
1817 | static | |
d1f652f8 | 1818 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1819 | { |
8c0393c3 MD |
1820 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1821 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1822 | int id; |
7e6f9ef6 | 1823 | |
d1f652f8 | 1824 | if (p == id_tracker_p) { |
7e6f9ef6 | 1825 | /* Tracker disabled. */ |
d1f652f8 | 1826 | id = -1; |
7e6f9ef6 | 1827 | } else { |
d1f652f8 | 1828 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1829 | |
d1f652f8 MD |
1830 | id = lttng_id_tracker_get_node_id(e); |
1831 | } | |
8c0393c3 | 1832 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1833 | case TRACKER_PID: |
1834 | seq_printf(m, "process { pid = %d; };\n", id); | |
1835 | break; | |
1836 | case TRACKER_VPID: | |
1837 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1838 | break; | |
1839 | case TRACKER_UID: | |
1840 | seq_printf(m, "user { uid = %d; };\n", id); | |
1841 | break; | |
1842 | case TRACKER_VUID: | |
1843 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1844 | break; | |
1845 | case TRACKER_GID: | |
1846 | seq_printf(m, "group { gid = %d; };\n", id); | |
1847 | break; | |
1848 | case TRACKER_VGID: | |
1849 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1850 | break; | |
1851 | default: | |
1852 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1853 | } |
7e6f9ef6 MD |
1854 | return 0; |
1855 | } | |
1856 | ||
1857 | static | |
d1f652f8 MD |
1858 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1859 | .start = id_list_start, | |
1860 | .next = id_list_next, | |
1861 | .stop = id_list_stop, | |
1862 | .show = id_list_show, | |
7e6f9ef6 MD |
1863 | }; |
1864 | ||
1865 | static | |
d1f652f8 | 1866 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1867 | { |
d1f652f8 | 1868 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1869 | } |
1870 | ||
1871 | static | |
d1f652f8 | 1872 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1873 | { |
1874 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1875 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1876 | int ret; |
1877 | ||
d1f652f8 | 1878 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1879 | ret = seq_release(inode, file); |
d1f652f8 | 1880 | if (!ret) |
8c0393c3 | 1881 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1882 | return ret; |
1883 | } | |
1884 | ||
d1f652f8 | 1885 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1886 | .owner = THIS_MODULE, |
d1f652f8 | 1887 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1888 | .read = seq_read, |
1889 | .llseek = seq_lseek, | |
d1f652f8 | 1890 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1891 | }; |
1892 | ||
8cdc1a81 | 1893 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1894 | enum tracker_type tracker_type) |
7e6f9ef6 | 1895 | { |
d1f652f8 | 1896 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1897 | struct seq_file *m; |
1898 | int file_fd, ret; | |
1899 | ||
1900 | file_fd = lttng_get_unused_fd(); | |
1901 | if (file_fd < 0) { | |
1902 | ret = file_fd; | |
1903 | goto fd_error; | |
1904 | } | |
1905 | ||
d1f652f8 MD |
1906 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1907 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1908 | NULL, O_RDWR); |
d1f652f8 MD |
1909 | if (IS_ERR(tracker_ids_list_file)) { |
1910 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1911 | goto file_error; |
1912 | } | |
8cdc1a81 | 1913 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1914 | ret = -EOVERFLOW; |
9c1f4643 MD |
1915 | goto refcount_error; |
1916 | } | |
d1f652f8 | 1917 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1918 | if (ret < 0) |
1919 | goto open_error; | |
d1f652f8 MD |
1920 | m = tracker_ids_list_file->private_data; |
1921 | ||
1922 | m->private = get_tracker(session, tracker_type); | |
1923 | BUG_ON(!m->private); | |
1924 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1925 | |
1926 | return file_fd; | |
1927 | ||
1928 | open_error: | |
8cdc1a81 | 1929 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1930 | refcount_error: |
d1f652f8 | 1931 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1932 | file_error: |
1933 | put_unused_fd(file_fd); | |
1934 | fd_error: | |
1935 | return ret; | |
1936 | } | |
1937 | ||
3c997079 MD |
1938 | /* |
1939 | * Enabler management. | |
1940 | */ | |
1941 | static | |
4993071a PP |
1942 | int lttng_match_enabler_star_glob(const char *desc_name, |
1943 | const char *pattern) | |
3c997079 | 1944 | { |
cbc19040 MD |
1945 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1946 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1947 | return 0; |
1948 | return 1; | |
1949 | } | |
1950 | ||
1951 | static | |
4ecb5ad5 MD |
1952 | int lttng_match_enabler_name(const char *desc_name, |
1953 | const char *name) | |
3c997079 | 1954 | { |
4ecb5ad5 | 1955 | if (strcmp(desc_name, name)) |
3c997079 MD |
1956 | return 0; |
1957 | return 1; | |
1958 | } | |
1959 | ||
437d5aa5 | 1960 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
8d554755 | 1961 | struct lttng_event_enabler_common *enabler) |
3c997079 | 1962 | { |
4ecb5ad5 | 1963 | const char *desc_name, *enabler_name; |
badfe9f5 | 1964 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1965 | |
1966 | enabler_name = enabler->event_param.name; | |
1967 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1968 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1969 | desc_name = desc->event_name; |
3b861b22 FD |
1970 | switch (enabler->format_type) { |
1971 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1972 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1973 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1974 | return lttng_match_enabler_name(desc_name, enabler_name); |
1975 | default: | |
1976 | return -EINVAL; | |
1977 | } | |
4ecb5ad5 | 1978 | break; |
b4a75708 | 1979 | |
606828e4 | 1980 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1981 | desc_name = desc->event_name; |
badfe9f5 | 1982 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1983 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1984 | compat = true; |
1985 | } | |
4ecb5ad5 MD |
1986 | if (!strncmp(desc_name, "syscall_exit_", |
1987 | strlen("syscall_exit_"))) { | |
1988 | desc_name += strlen("syscall_exit_"); | |
1989 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1990 | strlen("syscall_entry_"))) { | |
1991 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1992 | entry = true; |
4ecb5ad5 MD |
1993 | } else { |
1994 | WARN_ON_ONCE(1); | |
1995 | return -EINVAL; | |
1996 | } | |
badfe9f5 | 1997 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1998 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1999 | break; |
606828e4 | 2000 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
2001 | if (!entry) |
2002 | return 0; | |
2003 | break; | |
606828e4 | 2004 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
2005 | if (entry) |
2006 | return 0; | |
2007 | break; | |
2008 | default: | |
2009 | return -EINVAL; | |
2010 | } | |
2011 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 2012 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 2013 | break; |
606828e4 | 2014 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
2015 | if (compat) |
2016 | return 0; | |
2017 | break; | |
606828e4 | 2018 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
2019 | if (!compat) |
2020 | return 0; | |
2021 | break; | |
2022 | default: | |
2023 | return -EINVAL; | |
2024 | } | |
2025 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2026 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2027 | switch (enabler->format_type) { |
2028 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2029 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2030 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2031 | return lttng_match_enabler_name(desc_name, enabler_name); |
2032 | default: | |
2033 | return -EINVAL; | |
2034 | } | |
2035 | break; | |
606828e4 | 2036 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2037 | return -EINVAL; /* Not implemented. */ |
2038 | default: | |
2039 | return -EINVAL; | |
2040 | } | |
4ecb5ad5 | 2041 | break; |
b4a75708 | 2042 | |
4ecb5ad5 MD |
2043 | default: |
2044 | WARN_ON_ONCE(1); | |
2045 | return -EINVAL; | |
2046 | } | |
3c997079 MD |
2047 | } |
2048 | ||
2049 | static | |
1ae083ba | 2050 | int lttng_event_enabler_match_event(struct lttng_event_recorder_enabler *event_enabler, |
a67ba386 | 2051 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2052 | { |
1ae083ba | 2053 | struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler( |
b2bc0bc8 FD |
2054 | event_enabler); |
2055 | ||
a67ba386 | 2056 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2057 | return 0; |
a67ba386 MD |
2058 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2059 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2060 | return 1; |
2061 | else | |
2062 | return 0; | |
2063 | } | |
2064 | ||
b01155ba FD |
2065 | static |
2066 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2067 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba | 2068 | { |
8d554755 | 2069 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler( |
b01155ba FD |
2070 | event_notifier_enabler); |
2071 | ||
a67ba386 | 2072 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2073 | return 0; |
a67ba386 MD |
2074 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2075 | && event_notifier->priv->group == event_notifier_enabler->group | |
5b9817ae | 2076 | && event_notifier->priv->parent.user_token == event_notifier_enabler->parent.user_token) |
b01155ba FD |
2077 | return 1; |
2078 | else | |
2079 | return 0; | |
2080 | } | |
2081 | ||
3c997079 | 2082 | static |
b2bc0bc8 FD |
2083 | struct lttng_enabler_ref *lttng_enabler_ref( |
2084 | struct list_head *enablers_ref_list, | |
8d554755 | 2085 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2086 | { |
2087 | struct lttng_enabler_ref *enabler_ref; | |
2088 | ||
b2bc0bc8 | 2089 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2090 | if (enabler_ref->ref == enabler) |
2091 | return enabler_ref; | |
2092 | } | |
2093 | return NULL; | |
2094 | } | |
2095 | ||
3c997079 | 2096 | static |
1ae083ba | 2097 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler *event_enabler) |
3c997079 | 2098 | { |
f7d06400 | 2099 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; |
437d5aa5 MD |
2100 | struct lttng_kernel_probe_desc *probe_desc; |
2101 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2102 | int i; |
2103 | struct list_head *probe_list; | |
2104 | ||
2105 | probe_list = lttng_get_probe_list_head(); | |
2106 | /* | |
2107 | * For each probe event, if we find that a probe event matches | |
2108 | * our enabler, create an associated lttng_event if not | |
2109 | * already present. | |
2110 | */ | |
2111 | list_for_each_entry(probe_desc, probe_list, head) { | |
2112 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2113 | int found = 0; | |
2114 | struct hlist_head *head; | |
a67ba386 MD |
2115 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2116 | struct lttng_kernel_event_recorder *event_recorder; | |
3c997079 MD |
2117 | |
2118 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 | 2119 | if (!lttng_desc_match_enabler(desc, |
1ae083ba | 2120 | lttng_event_recorder_enabler_as_enabler(event_enabler))) |
3c997079 | 2121 | continue; |
3c997079 MD |
2122 | |
2123 | /* | |
2124 | * Check if already created. | |
2125 | */ | |
4a11ef1c | 2126 | head = utils_borrow_hash_table_bucket( |
8cdc1a81 | 2127 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 2128 | desc->event_name); |
a67ba386 MD |
2129 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2130 | if (event_recorder_private->parent.desc == desc | |
2131 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2132 | found = 1; |
2133 | } | |
2134 | if (found) | |
2135 | continue; | |
2136 | ||
2137 | /* | |
2138 | * We need to create an event for this | |
2139 | * event probe. | |
2140 | */ | |
def1e304 | 2141 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); |
a67ba386 | 2142 | if (!event_recorder) { |
5a15f70c | 2143 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2144 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2145 | } |
2146 | } | |
2147 | } | |
2148 | } | |
2149 | ||
b01155ba FD |
2150 | static |
2151 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2152 | { | |
2153 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2154 | struct lttng_kernel_probe_desc *probe_desc; |
2155 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2156 | int i; |
2157 | struct list_head *probe_list; | |
2158 | ||
2159 | probe_list = lttng_get_probe_list_head(); | |
2160 | /* | |
2161 | * For each probe event, if we find that a probe event matches | |
2162 | * our enabler, create an associated lttng_event_notifier if not | |
2163 | * already present. | |
2164 | */ | |
2165 | list_for_each_entry(probe_desc, probe_list, head) { | |
2166 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2167 | int found = 0; | |
2168 | struct hlist_head *head; | |
a67ba386 MD |
2169 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2170 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2171 | |
2172 | desc = probe_desc->event_desc[i]; | |
2173 | if (!lttng_desc_match_enabler(desc, | |
2174 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2175 | continue; | |
2176 | ||
2177 | /* | |
2178 | * Check if already created. | |
2179 | */ | |
2180 | head = utils_borrow_hash_table_bucket( | |
2181 | event_notifier_group->event_notifiers_ht.table, | |
437d5aa5 | 2182 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
2183 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2184 | if (event_notifier_priv->parent.desc == desc | |
5b9817ae | 2185 | && event_notifier_priv->parent.user_token == event_notifier_enabler->parent.user_token) |
b01155ba FD |
2186 | found = 1; |
2187 | } | |
2188 | if (found) | |
2189 | continue; | |
2190 | ||
2191 | /* | |
2192 | * We need to create a event_notifier for this event probe. | |
2193 | */ | |
2194 | event_notifier = _lttng_event_notifier_create(desc, | |
5b9817ae | 2195 | event_notifier_enabler->parent.user_token, |
99f52fcc | 2196 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2197 | event_notifier_group, NULL, |
606828e4 | 2198 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2199 | if (IS_ERR(event_notifier)) { |
2200 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2201 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2202 | } |
2203 | } | |
2204 | } | |
2205 | } | |
2206 | ||
33a39a3c | 2207 | static |
053554ae | 2208 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c MD |
2209 | { |
2210 | int ret; | |
2211 | ||
053554ae | 2212 | ret = lttng_syscalls_register_event(event_enabler); |
8a8ac9a8 | 2213 | WARN_ON_ONCE(ret); |
8a8ac9a8 FD |
2214 | } |
2215 | ||
33a39a3c | 2216 | /* |
a67ba386 | 2217 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2218 | * tracepoint probes. |
2219 | * Should be called with sessions mutex held. | |
2220 | */ | |
2221 | static | |
1ae083ba | 2222 | void lttng_create_event_if_missing(struct lttng_event_recorder_enabler *event_enabler) |
33a39a3c | 2223 | { |
5b9817ae | 2224 | switch (event_enabler->parent.event_param.instrumentation) { |
606828e4 | 2225 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2226 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2227 | break; |
b4a75708 | 2228 | |
606828e4 | 2229 | case LTTNG_KERNEL_ABI_SYSCALL: |
053554ae | 2230 | lttng_create_syscall_event_if_missing(&event_enabler->parent); |
33a39a3c | 2231 | break; |
b4a75708 | 2232 | |
33a39a3c MD |
2233 | default: |
2234 | WARN_ON_ONCE(1); | |
2235 | break; | |
2236 | } | |
2237 | } | |
2238 | ||
3c997079 | 2239 | /* |
b2bc0bc8 | 2240 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2241 | * and add backward reference from the event to the enabler. |
2242 | * Should be called with sessions mutex held. | |
2243 | */ | |
2244 | static | |
1ae083ba | 2245 | int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler *event_enabler) |
3c997079 | 2246 | { |
f7d06400 MD |
2247 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
2248 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; | |
1ae083ba | 2249 | struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(event_enabler); |
a67ba386 | 2250 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2251 | |
606828e4 MD |
2252 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2253 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2254 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2255 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2256 | int enabled = base_enabler->enabled; |
606828e4 | 2257 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2258 | |
606828e4 | 2259 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2260 | WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_entry, enabled); |
3b82c4e1 | 2261 | |
606828e4 | 2262 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2263 | WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_exit, enabled); |
badfe9f5 MD |
2264 | } |
2265 | ||
3c997079 | 2266 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2267 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2268 | |
b2bc0bc8 | 2269 | /* For each event matching event_enabler in session event list. */ |
8cdc1a81 | 2270 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2271 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2272 | struct lttng_enabler_ref *enabler_ref; |
2273 | ||
a67ba386 | 2274 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2275 | continue; |
a67ba386 | 2276 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
1ae083ba | 2277 | lttng_event_recorder_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2278 | if (!enabler_ref) { |
2279 | /* | |
2280 | * If no backward ref, create it. | |
b2bc0bc8 | 2281 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2282 | */ |
2283 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2284 | if (!enabler_ref) | |
2285 | return -ENOMEM; | |
1ae083ba | 2286 | enabler_ref->ref = lttng_event_recorder_enabler_as_enabler(event_enabler); |
3c997079 | 2287 | list_add(&enabler_ref->node, |
a67ba386 | 2288 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2289 | } |
2290 | ||
f127e61e MD |
2291 | /* |
2292 | * Link filter bytecodes if not linked yet. | |
2293 | */ | |
a67ba386 | 2294 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2295 | lttng_static_ctx, |
a67ba386 | 2296 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
1ae083ba | 2297 | <tng_event_recorder_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2298 | } |
2299 | return 0; | |
2300 | } | |
2301 | ||
b01155ba | 2302 | /* |
a67ba386 | 2303 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2304 | * tracepoint probes. |
2305 | * Should be called with sessions mutex held. | |
2306 | */ | |
2307 | static | |
2308 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2309 | { | |
5b9817ae | 2310 | switch (event_notifier_enabler->parent.event_param.instrumentation) { |
606828e4 | 2311 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2312 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2313 | break; | |
b4a75708 | 2314 | |
606828e4 | 2315 | case LTTNG_KERNEL_ABI_SYSCALL: |
053554ae | 2316 | lttng_create_syscall_event_if_missing(&event_notifier_enabler->parent); |
8a8ac9a8 | 2317 | break; |
b4a75708 | 2318 | |
b01155ba FD |
2319 | default: |
2320 | WARN_ON_ONCE(1); | |
2321 | break; | |
2322 | } | |
2323 | } | |
2324 | ||
2325 | /* | |
2326 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2327 | */ | |
2328 | static | |
8a8ac9a8 FD |
2329 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2330 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2331 | { |
2332 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8d554755 | 2333 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2334 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2335 | |
606828e4 MD |
2336 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2337 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2338 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2339 | !strcmp(base_enabler->event_param.name, "*")) { |
2340 | ||
2341 | int enabled = base_enabler->enabled; | |
606828e4 | 2342 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2343 | |
606828e4 | 2344 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2345 | WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_entry, enabled); |
8a8ac9a8 | 2346 | |
606828e4 | 2347 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2348 | WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_exit, enabled); |
8a8ac9a8 FD |
2349 | |
2350 | } | |
2351 | ||
b01155ba FD |
2352 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2353 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2354 | ||
2355 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2356 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2357 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2358 | struct lttng_enabler_ref *enabler_ref; |
2359 | ||
2360 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2361 | continue; | |
2362 | ||
a67ba386 | 2363 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2364 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2365 | if (!enabler_ref) { | |
2366 | /* | |
2367 | * If no backward ref, create it. | |
2368 | * Add backward ref from event_notifier to enabler. | |
2369 | */ | |
2370 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2371 | if (!enabler_ref) | |
2372 | return -ENOMEM; | |
2373 | ||
2374 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2375 | event_notifier_enabler); | |
2376 | list_add(&enabler_ref->node, | |
a67ba386 | 2377 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2378 | } |
2379 | ||
2380 | /* | |
2381 | * Link filter bytecodes if not linked yet. | |
2382 | */ | |
a67ba386 MD |
2383 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2384 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2385 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2386 | |
2387 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2388 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2389 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2390 | &event_notifier_enabler->capture_bytecode_head); |
2391 | ||
a67ba386 | 2392 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2393 | } |
2394 | return 0; | |
2395 | } | |
2396 | ||
3c997079 MD |
2397 | /* |
2398 | * Called at module load: connect the probe on all enablers matching | |
2399 | * this event. | |
2400 | * Called with sessions lock held. | |
2401 | */ | |
2402 | int lttng_fix_pending_events(void) | |
2403 | { | |
8cdc1a81 | 2404 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2405 | |
8cdc1a81 MD |
2406 | list_for_each_entry(session_priv, &sessions, list) |
2407 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2408 | return 0; |
2409 | } | |
2410 | ||
b01155ba FD |
2411 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2412 | struct lttng_event_notifier_group *event_notifier_group) | |
2413 | { | |
2414 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2415 | ||
2416 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2417 | node) { | |
5b9817ae | 2418 | if (event_notifier_enabler->parent.enabled) |
b01155ba FD |
2419 | return true; |
2420 | } | |
2421 | return false; | |
2422 | } | |
2423 | ||
2424 | bool lttng_event_notifier_active(void) | |
2425 | { | |
2426 | struct lttng_event_notifier_group *event_notifier_group; | |
2427 | ||
2428 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2429 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2430 | return true; | |
2431 | } | |
2432 | return false; | |
2433 | } | |
2434 | ||
2435 | int lttng_fix_pending_event_notifiers(void) | |
2436 | { | |
2437 | struct lttng_event_notifier_group *event_notifier_group; | |
2438 | ||
2439 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2440 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2441 | return 0; | |
2442 | } | |
2443 | ||
1ae083ba | 2444 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2445 | enum lttng_enabler_format_type format_type, |
606828e4 | 2446 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2447 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2448 | { |
1ae083ba | 2449 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2450 | |
b2bc0bc8 FD |
2451 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2452 | if (!event_enabler) | |
3c997079 | 2453 | return NULL; |
0bb716a8 | 2454 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2455 | event_enabler->parent.format_type = format_type; |
2456 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2457 | memcpy(&event_enabler->parent.event_param, event_param, | |
2458 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2459 | event_enabler->chan = chan; |
3c997079 | 2460 | /* ctx left NULL */ |
5b9817ae | 2461 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2462 | return event_enabler; |
2463 | } | |
2464 | ||
2465 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2466 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2467 | { |
3c997079 | 2468 | mutex_lock(&sessions_mutex); |
def1e304 MD |
2469 | list_add(&event_enabler->node, &session->priv->enablers_head); |
2470 | event_enabler->published = true; | |
2471 | lttng_session_lazy_sync_event_enablers(session); | |
3c997079 | 2472 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2473 | } |
2474 | ||
7b25ab0e | 2475 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2476 | { |
2477 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2478 | event_enabler->enabled = 1; |
2479 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2480 | mutex_unlock(&sessions_mutex); |
2481 | return 0; | |
2482 | } | |
2483 | ||
7b25ab0e | 2484 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2485 | { |
2486 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2487 | event_enabler->enabled = 0; |
2488 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2489 | mutex_unlock(&sessions_mutex); |
2490 | return 0; | |
2491 | } | |
2492 | ||
b2bc0bc8 | 2493 | static |
8d554755 | 2494 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2495 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2496 | { |
d64ca521 | 2497 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2498 | uint32_t bytecode_len; |
2499 | int ret; | |
2500 | ||
2501 | ret = get_user(bytecode_len, &bytecode->len); | |
2502 | if (ret) | |
2503 | return ret; | |
52cfcdf3 | 2504 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2505 | GFP_KERNEL); |
2506 | if (!bytecode_node) | |
2507 | return -ENOMEM; | |
2508 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2509 | sizeof(*bytecode) + bytecode_len); | |
2510 | if (ret) | |
2511 | goto error_free; | |
b2bc0bc8 | 2512 | |
8a445457 | 2513 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2514 | bytecode_node->enabler = enabler; |
2515 | /* Enforce length based on allocated size */ | |
2516 | bytecode_node->bc.len = bytecode_len; | |
2517 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2518 | |
07dfc1d0 MD |
2519 | return 0; |
2520 | ||
2521 | error_free: | |
52cfcdf3 | 2522 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2523 | return ret; |
2524 | } | |
2525 | ||
6048044f | 2526 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2527 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2528 | { |
2529 | int ret; | |
6048044f | 2530 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2531 | if (ret) |
2532 | goto error; | |
7b25ab0e | 2533 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2534 | return 0; |
2535 | ||
2536 | error: | |
2537 | return ret; | |
2538 | } | |
2539 | ||
e2d5dbc7 | 2540 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2541 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2542 | { |
2543 | ||
e2d5dbc7 | 2544 | switch (event->priv->instrumentation) { |
606828e4 | 2545 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2546 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2547 | default: |
2548 | return -EINVAL; | |
2549 | } | |
2550 | } | |
2551 | ||
3c997079 | 2552 | static |
8d554755 | 2553 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2554 | { |
d64ca521 | 2555 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2556 | |
2557 | /* Destroy filter bytecode */ | |
2558 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2559 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2560 | lttng_kvfree(filter_node); |
07dfc1d0 | 2561 | } |
b2bc0bc8 FD |
2562 | } |
2563 | ||
44b1abdc | 2564 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2565 | { |
44b1abdc MD |
2566 | switch (event_enabler->enabler_type) { |
2567 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2568 | { | |
2569 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2570 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2571 | ||
2572 | lttng_enabler_destroy(event_enabler); | |
2573 | if (event_recorder_enabler->published) | |
2574 | list_del(&event_recorder_enabler->node); | |
2575 | kfree(event_recorder_enabler); | |
2576 | break; | |
2577 | } | |
2578 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2579 | { | |
2580 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2581 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2582 | |
44b1abdc MD |
2583 | list_del(&event_notifier_enabler->node); |
2584 | lttng_enabler_destroy(event_enabler); | |
2585 | kfree(event_notifier_enabler); | |
2586 | break; | |
2587 | } | |
2588 | default: | |
2589 | WARN_ON_ONCE(1); | |
2590 | } | |
3c997079 MD |
2591 | } |
2592 | ||
dffef45d FD |
2593 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2594 | struct lttng_event_notifier_group *event_notifier_group, | |
2595 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2596 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2597 | { |
2598 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2599 | ||
2600 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2601 | if (!event_notifier_enabler) | |
2602 | return NULL; | |
2603 | ||
0bb716a8 | 2604 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2605 | event_notifier_enabler->parent.format_type = format_type; |
2606 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2607 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2608 | ||
99f52fcc | 2609 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2610 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2611 | |
5b9817ae MD |
2612 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2613 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2614 | |
5b9817ae MD |
2615 | event_notifier_enabler->parent.enabled = 0; |
2616 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d FD |
2617 | event_notifier_enabler->group = event_notifier_group; |
2618 | ||
2619 | mutex_lock(&sessions_mutex); | |
2620 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2621 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2622 | |
2623 | mutex_unlock(&sessions_mutex); | |
2624 | ||
2625 | return event_notifier_enabler; | |
2626 | } | |
2627 | ||
2628 | int lttng_event_notifier_enabler_enable( | |
2629 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2630 | { | |
2631 | mutex_lock(&sessions_mutex); | |
2632 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2633 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2634 | mutex_unlock(&sessions_mutex); |
2635 | return 0; | |
2636 | } | |
2637 | ||
2638 | int lttng_event_notifier_enabler_disable( | |
2639 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2640 | { | |
2641 | mutex_lock(&sessions_mutex); | |
2642 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2643 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2644 | mutex_unlock(&sessions_mutex); |
2645 | return 0; | |
2646 | } | |
2647 | ||
99d223ad FD |
2648 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2649 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2650 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2651 | { |
d64ca521 | 2652 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2653 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2654 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2655 | uint32_t bytecode_len; | |
2656 | int ret; | |
2657 | ||
2658 | ret = get_user(bytecode_len, &bytecode->len); | |
2659 | if (ret) | |
2660 | return ret; | |
2661 | ||
2662 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2663 | GFP_KERNEL); | |
2664 | if (!bytecode_node) | |
2665 | return -ENOMEM; | |
2666 | ||
2667 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2668 | sizeof(*bytecode) + bytecode_len); | |
2669 | if (ret) | |
2670 | goto error_free; | |
2671 | ||
8a445457 | 2672 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2673 | bytecode_node->enabler = enabler; |
2674 | ||
2675 | /* Enforce length based on allocated size */ | |
2676 | bytecode_node->bc.len = bytecode_len; | |
2677 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2678 | ||
2679 | event_notifier_enabler->num_captures++; | |
2680 | ||
2681 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2682 | goto end; | |
2683 | ||
2684 | error_free: | |
2685 | lttng_kvfree(bytecode_node); | |
2686 | end: | |
2687 | return ret; | |
2688 | } | |
2689 | ||
3c997079 | 2690 | /* |
b2bc0bc8 | 2691 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2692 | * session. |
2693 | * Should be called with sessions mutex held. | |
2694 | */ | |
2695 | static | |
8cdc1a81 | 2696 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2697 | { |
1ae083ba | 2698 | struct lttng_event_recorder_enabler *event_enabler; |
a67ba386 | 2699 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2700 | |
8cdc1a81 | 2701 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2702 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2703 | /* |
2704 | * For each event, if at least one of its enablers is enabled, | |
2705 | * and its channel and session transient states are enabled, we | |
2706 | * enable the event, else we disable it. | |
2707 | */ | |
8cdc1a81 | 2708 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2709 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2710 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2711 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2712 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2713 | int nr_filters = 0; | |
3c997079 | 2714 | |
a67ba386 | 2715 | switch (event_recorder_priv->parent.instrumentation) { |
c190d76e MJ |
2716 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2717 | lttng_fallthrough; | |
606828e4 | 2718 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
2719 | /* Enable events */ |
2720 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2721 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2722 | if (enabler_ref->ref->enabled) { |
2723 | enabled = 1; | |
2724 | break; | |
2725 | } | |
2726 | } | |
4ecb5ad5 | 2727 | break; |
b4a75708 | 2728 | |
4ecb5ad5 | 2729 | default: |
3c997079 MD |
2730 | /* Not handled with lazy sync. */ |
2731 | continue; | |
2732 | } | |
2733 | /* | |
2734 | * Enabled state is based on union of enablers, with | |
2735 | * intesection of session and channel transient enable | |
2736 | * states. | |
2737 | */ | |
f7d06400 | 2738 | enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; |
3c997079 | 2739 | |
a67ba386 | 2740 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2741 | /* |
2742 | * Sync tracepoint registration with event enabled | |
2743 | * state. | |
2744 | */ | |
2745 | if (enabled) { | |
0c851fa0 | 2746 | register_event(&event_recorder->parent); |
3c997079 | 2747 | } else { |
96c59af1 | 2748 | _lttng_event_recorder_unregister(event_recorder); |
3c997079 | 2749 | } |
07dfc1d0 MD |
2750 | |
2751 | /* Check if has enablers without bytecode enabled */ | |
2752 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2753 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2754 | if (enabler_ref->ref->enabled |
2755 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2756 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2757 | break; |
2758 | } | |
2759 | } | |
a67ba386 | 2760 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2761 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2762 | |
2763 | /* Enable filters */ | |
2764 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2765 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2766 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2767 | nr_filters++; |
2768 | } | |
2769 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2770 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2771 | } |
2772 | } | |
2773 | ||
2774 | /* | |
2775 | * Apply enablers to session events, adding events to session if need | |
2776 | * be. It is required after each modification applied to an active | |
2777 | * session, and right before session "start". | |
2778 | * "lazy" sync means we only sync if required. | |
2779 | * Should be called with sessions mutex held. | |
2780 | */ | |
2781 | static | |
8cdc1a81 | 2782 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2783 | { |
2784 | /* We can skip if session is not active */ | |
2785 | if (!session->active) | |
2786 | return; | |
b2bc0bc8 | 2787 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2788 | } |
2789 | ||
b01155ba FD |
2790 | static |
2791 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2792 | { | |
2793 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2794 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2795 | |
2796 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2797 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2798 | ||
2799 | /* | |
2800 | * For each event_notifier, if at least one of its enablers is enabled, | |
2801 | * we enable the event_notifier, else we disable it. | |
2802 | */ | |
a67ba386 MD |
2803 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2804 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2805 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2806 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2807 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2808 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2809 | |
a67ba386 | 2810 | switch (event_notifier_priv->parent.instrumentation) { |
c190d76e MJ |
2811 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2812 | lttng_fallthrough; | |
606828e4 | 2813 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
2814 | /* Enable event_notifiers */ |
2815 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2816 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2817 | if (enabler_ref->ref->enabled) { |
2818 | enabled = 1; | |
2819 | break; | |
2820 | } | |
2821 | } | |
2822 | break; | |
b4a75708 | 2823 | |
b01155ba FD |
2824 | default: |
2825 | /* Not handled with sync. */ | |
2826 | continue; | |
2827 | } | |
2828 | ||
a67ba386 | 2829 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2830 | /* |
2831 | * Sync tracepoint registration with event_notifier enabled | |
2832 | * state. | |
2833 | */ | |
2834 | if (enabled) { | |
a67ba386 | 2835 | if (!event_notifier_priv->parent.registered) |
0c851fa0 | 2836 | register_event(&event_notifier->parent); |
b01155ba | 2837 | } else { |
a67ba386 | 2838 | if (event_notifier_priv->parent.registered) |
b01155ba FD |
2839 | _lttng_event_notifier_unregister(event_notifier); |
2840 | } | |
2841 | ||
2842 | /* Check if has enablers without bytecode enabled */ | |
2843 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2844 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2845 | if (enabler_ref->ref->enabled |
2846 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2847 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2848 | break; |
2849 | } | |
2850 | } | |
a67ba386 | 2851 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2852 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2853 | |
2854 | /* Enable filters */ | |
2855 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2856 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2857 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2858 | nr_filters++; |
2859 | } | |
2860 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2861 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2862 | |
2863 | /* Enable captures */ | |
2864 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2865 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2866 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2867 | nr_captures++; |
2868 | } | |
2869 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2870 | } |
2871 | } | |
2872 | ||
7b25ab0e MD |
2873 | static |
2874 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2875 | { | |
2876 | switch (event_enabler->enabler_type) { | |
2877 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2878 | { | |
2879 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2880 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2881 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2882 | break; | |
2883 | } | |
2884 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2885 | { | |
2886 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2887 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2888 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2889 | break; | |
2890 | } | |
2891 | default: | |
2892 | WARN_ON_ONCE(1); | |
2893 | } | |
2894 | } | |
2895 | ||
1ec3f75a | 2896 | /* |
d83004aa JD |
2897 | * Serialize at most one packet worth of metadata into a metadata |
2898 | * channel. | |
92d9f5e6 MD |
2899 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2900 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2901 | * allows us to do racy operations such as looking for remaining space left in | |
2902 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2903 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2904 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2905 | * Returns the number of bytes written in the channel, 0 if no data |
2906 | * was written and a negative value on error. | |
1ec3f75a | 2907 | */ |
b3b8072b | 2908 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2909 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2910 | { |
8a57ec02 | 2911 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2912 | int ret = 0; |
2913 | size_t len, reserve_len; | |
2914 | ||
f613e3e6 | 2915 | /* |
92d9f5e6 MD |
2916 | * Ensure we support mutiple get_next / put sequences followed by |
2917 | * put_next. The metadata cache lock protects reading the metadata | |
2918 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2919 | * "flush" operations on the buffer invoked by different processes. | |
2920 | * Moreover, since the metadata cache memory can be reallocated, we | |
2921 | * need to have exclusive access against updates even though we only | |
2922 | * read it. | |
f613e3e6 | 2923 | */ |
92d9f5e6 | 2924 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2925 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2926 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2927 | goto end; |
f613e3e6 | 2928 | |
9616f0bf JD |
2929 | /* Metadata regenerated, change the version. */ |
2930 | if (stream->metadata_cache->version != stream->version) | |
2931 | stream->version = stream->metadata_cache->version; | |
2932 | ||
d83004aa | 2933 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2934 | stream->metadata_in; |
9de2c215 | 2935 | if (!len) |
de23d59d | 2936 | goto end; |
d83004aa | 2937 | reserve_len = min_t(size_t, |
4a399b76 | 2938 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2939 | len); |
a775608d | 2940 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2941 | sizeof(char), NULL); |
d83004aa JD |
2942 | /* |
2943 | * If reservation failed, return an error to the caller. | |
2944 | */ | |
c2fb9c1c | 2945 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2946 | if (ret != 0) { |
2947 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2948 | stream->coherent = false; |
d83004aa JD |
2949 | goto end; |
2950 | } | |
b3b8072b | 2951 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2952 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2953 | reserve_len, 1); |
b3b8072b | 2954 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2955 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2956 | if (reserve_len < len) |
8b97fd42 MD |
2957 | stream->coherent = false; |
2958 | else | |
2959 | stream->coherent = true; | |
d83004aa JD |
2960 | ret = reserve_len; |
2961 | ||
2962 | end: | |
8b97fd42 MD |
2963 | if (coherent) |
2964 | *coherent = stream->coherent; | |
92d9f5e6 | 2965 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2966 | return ret; |
2967 | } | |
2968 | ||
8b97fd42 | 2969 | static |
8cdc1a81 | 2970 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2971 | { |
8cdc1a81 MD |
2972 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2973 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2974 | } |
2975 | ||
2976 | static | |
8cdc1a81 | 2977 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2978 | { |
8cdc1a81 MD |
2979 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2980 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2981 | struct lttng_metadata_stream *stream; |
2982 | ||
8cdc1a81 | 2983 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2984 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2985 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2986 | } |
8b97fd42 MD |
2987 | } |
2988 | ||
d83004aa JD |
2989 | /* |
2990 | * Write the metadata to the metadata cache. | |
2991 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2992 | * The metadata cache lock protects us from concurrent read access from |
2993 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2994 | * The content of the printf is printed as a single atomic metadata |
2995 | * transaction. | |
d83004aa | 2996 | */ |
8cdc1a81 | 2997 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2998 | const char *fmt, ...) |
2999 | { | |
c099397a | 3000 | char *str; |
d83004aa | 3001 | size_t len; |
c099397a MD |
3002 | va_list ap; |
3003 | ||
585e5dcc | 3004 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
3005 | |
3006 | va_start(ap, fmt); | |
3007 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
3008 | va_end(ap); | |
3009 | if (!str) | |
3010 | return -ENOMEM; | |
3011 | ||
1ec3f75a | 3012 | len = strlen(str); |
8cdc1a81 MD |
3013 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3014 | if (session->priv->metadata_cache->metadata_written + len > | |
3015 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
3016 | char *tmp_cache_realloc; |
3017 | unsigned int tmp_cache_alloc_size; | |
3018 | ||
3019 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
3020 | session->priv->metadata_cache->cache_alloc + len, |
3021 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 3022 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
3023 | if (!tmp_cache_realloc) |
3024 | goto err; | |
8cdc1a81 | 3025 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 3026 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
3027 | session->priv->metadata_cache->data, |
3028 | session->priv->metadata_cache->cache_alloc); | |
3029 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
3030 | } |
3031 | ||
8cdc1a81 MD |
3032 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3033 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3034 | } |
8cdc1a81 MD |
3035 | memcpy(session->priv->metadata_cache->data + |
3036 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3037 | str, len); |
8cdc1a81 | 3038 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3039 | kfree(str); |
d83004aa | 3040 | |
d83004aa JD |
3041 | return 0; |
3042 | ||
3043 | err: | |
3044 | kfree(str); | |
3045 | return -ENOMEM; | |
c099397a MD |
3046 | } |
3047 | ||
f513b2bf | 3048 | static |
8cdc1a81 | 3049 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3050 | { |
3051 | size_t i; | |
3052 | ||
3053 | for (i = 0; i < nesting; i++) { | |
3054 | int ret; | |
3055 | ||
3056 | ret = lttng_metadata_printf(session, " "); | |
3057 | if (ret) { | |
3058 | return ret; | |
3059 | } | |
3060 | } | |
3061 | return 0; | |
3062 | } | |
3063 | ||
ceabb767 | 3064 | static |
8cdc1a81 | 3065 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3066 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3067 | size_t nesting) |
3068 | { | |
3069 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3070 | } | |
3071 | ||
3072 | static | |
8cdc1a81 | 3073 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3074 | const struct lttng_kernel_type_integer *type, |
3075 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3076 | size_t nesting) |
3077 | { | |
3078 | int ret; | |
3079 | ||
ceabb767 MD |
3080 | ret = print_tabs(session, nesting); |
3081 | if (ret) | |
3082 | return ret; | |
3083 | ret = lttng_metadata_printf(session, | |
3084 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3085 | type->size, |
3086 | type->alignment, | |
3087 | type->signedness, | |
3088 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3089 | ? "none" |
437d5aa5 | 3090 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3091 | ? "UTF8" |
3092 | : "ASCII", | |
437d5aa5 | 3093 | type->base, |
ceabb767 | 3094 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3095 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3096 | #else |
437d5aa5 | 3097 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3098 | #endif |
3099 | ); | |
3100 | return ret; | |
3101 | } | |
3102 | ||
f513b2bf MD |
3103 | /* |
3104 | * Must be called with sessions_mutex held. | |
3105 | */ | |
3106 | static | |
8cdc1a81 | 3107 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3108 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3109 | size_t nesting) |
3110 | { | |
51ef4536 | 3111 | const char *prev_field_name = NULL; |
f513b2bf MD |
3112 | int ret; |
3113 | uint32_t i, nr_fields; | |
ceabb767 MD |
3114 | unsigned int alignment; |
3115 | ||
f513b2bf MD |
3116 | ret = print_tabs(session, nesting); |
3117 | if (ret) | |
3118 | return ret; | |
3119 | ret = lttng_metadata_printf(session, | |
3120 | "struct {\n"); | |
3121 | if (ret) | |
3122 | return ret; | |
437d5aa5 | 3123 | nr_fields = type->nr_fields; |
f513b2bf | 3124 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3125 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3126 | |
437d5aa5 | 3127 | iter_field = type->fields[i]; |
51ef4536 | 3128 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3129 | if (ret) |
3130 | return ret; | |
3131 | } | |
3132 | ret = print_tabs(session, nesting); | |
3133 | if (ret) | |
3134 | return ret; | |
437d5aa5 | 3135 | alignment = type->alignment; |
ceabb767 MD |
3136 | if (alignment) { |
3137 | ret = lttng_metadata_printf(session, | |
3138 | "} align(%u)", | |
3139 | alignment); | |
3140 | } else { | |
3141 | ret = lttng_metadata_printf(session, | |
3142 | "}"); | |
3143 | } | |
f513b2bf MD |
3144 | return ret; |
3145 | } | |
3146 | ||
3147 | /* | |
3148 | * Must be called with sessions_mutex held. | |
3149 | */ | |
3150 | static | |
8cdc1a81 | 3151 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3152 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3153 | size_t nesting) |
3154 | { | |
3155 | int ret; | |
3156 | ||
3157 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3158 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3159 | if (ret) |
3160 | return ret; | |
ceabb767 | 3161 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3162 | } |
3163 | ||
65c85aa6 MD |
3164 | /* |
3165 | * Must be called with sessions_mutex held. | |
3166 | */ | |
3167 | static | |
8cdc1a81 | 3168 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3169 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3170 | size_t nesting, |
3171 | const char *prev_field_name) | |
65c85aa6 | 3172 | { |
51ef4536 | 3173 | const char *tag_name; |
65c85aa6 MD |
3174 | int ret; |
3175 | uint32_t i, nr_choices; | |
3176 | ||
51ef4536 MD |
3177 | tag_name = type->tag_name; |
3178 | if (!tag_name) | |
3179 | tag_name = prev_field_name; | |
3180 | if (!tag_name) | |
3181 | return -EINVAL; | |
ceabb767 MD |
3182 | /* |
3183 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3184 | */ | |
437d5aa5 | 3185 | if (type->alignment != 0) |
ceabb767 | 3186 | return -EINVAL; |
65c85aa6 MD |
3187 | ret = print_tabs(session, nesting); |
3188 | if (ret) | |
3189 | return ret; | |
3190 | ret = lttng_metadata_printf(session, | |
3191 | "variant <_%s> {\n", | |
51ef4536 | 3192 | tag_name); |
65c85aa6 MD |
3193 | if (ret) |
3194 | return ret; | |
437d5aa5 | 3195 | nr_choices = type->nr_choices; |
65c85aa6 | 3196 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3197 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3198 | |
437d5aa5 | 3199 | iter_field = type->choices[i]; |
51ef4536 | 3200 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3201 | if (ret) |
3202 | return ret; | |
3203 | } | |
3204 | ret = print_tabs(session, nesting); | |
3205 | if (ret) | |
3206 | return ret; | |
3207 | ret = lttng_metadata_printf(session, | |
3208 | "}"); | |
3209 | return ret; | |
3210 | } | |
3211 | ||
3212 | /* | |
3213 | * Must be called with sessions_mutex held. | |
3214 | */ | |
3215 | static | |
8cdc1a81 | 3216 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3217 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3218 | size_t nesting, |
3219 | const char *prev_field_name) | |
65c85aa6 MD |
3220 | { |
3221 | int ret; | |
3222 | ||
3223 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3224 | lttng_kernel_get_type_variant(field->type), nesting, |
3225 | prev_field_name); | |
65c85aa6 MD |
3226 | if (ret) |
3227 | return ret; | |
ceabb767 | 3228 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3229 | } |
3230 | ||
f513b2bf MD |
3231 | /* |
3232 | * Must be called with sessions_mutex held. | |
3233 | */ | |
3234 | static | |
8cdc1a81 | 3235 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3236 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3237 | size_t nesting) |
3238 | { | |
3239 | int ret; | |
437d5aa5 MD |
3240 | const struct lttng_kernel_type_array *array_type; |
3241 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3242 | |
437d5aa5 MD |
3243 | array_type = lttng_kernel_get_type_array(field->type); |
3244 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3245 | |
437d5aa5 | 3246 | if (array_type->alignment) { |
ceabb767 | 3247 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3248 | if (ret) |
3249 | return ret; | |
ceabb767 MD |
3250 | ret = lttng_metadata_printf(session, |
3251 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3252 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3253 | field->name); |
3254 | if (ret) | |
3255 | return ret; | |
3256 | } | |
3257 | /* | |
3258 | * Nested compound types: Only array of structures and variants are | |
3259 | * currently supported. | |
3260 | */ | |
437d5aa5 | 3261 | elem_type = array_type->elem_type; |
12bb2edb MD |
3262 | switch (elem_type->type) { |
3263 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3264 | case lttng_kernel_type_struct: |
3265 | case lttng_kernel_type_variant: | |
3266 | ret = _lttng_type_statedump(session, elem_type, | |
3267 | array_type->encoding, nesting); | |
65c85aa6 MD |
3268 | if (ret) |
3269 | return ret; | |
3270 | break; | |
ceabb767 | 3271 | |
f513b2bf MD |
3272 | default: |
3273 | return -EINVAL; | |
3274 | } | |
3275 | ret = lttng_metadata_printf(session, | |
3276 | " _%s[%u];\n", | |
3277 | field->name, | |
437d5aa5 | 3278 | array_type->length); |
f513b2bf MD |
3279 | return ret; |
3280 | } | |
3281 | ||
3282 | /* | |
3283 | * Must be called with sessions_mutex held. | |
3284 | */ | |
3285 | static | |
8cdc1a81 | 3286 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3287 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3288 | size_t nesting, |
3289 | const char *prev_field_name) | |
f513b2bf MD |
3290 | { |
3291 | int ret; | |
3292 | const char *length_name; | |
437d5aa5 MD |
3293 | const struct lttng_kernel_type_sequence *sequence_type; |
3294 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3295 | |
437d5aa5 MD |
3296 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3297 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3298 | |
437d5aa5 | 3299 | length_name = sequence_type->length_name; |
51ef4536 MD |
3300 | if (!length_name) |
3301 | length_name = prev_field_name; | |
3302 | if (!length_name) | |
3303 | return -EINVAL; | |
ceabb767 | 3304 | |
437d5aa5 | 3305 | if (sequence_type->alignment) { |
ceabb767 | 3306 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3307 | if (ret) |
3308 | return ret; | |
ceabb767 MD |
3309 | ret = lttng_metadata_printf(session, |
3310 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3311 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3312 | field->name); |
3313 | if (ret) | |
3314 | return ret; | |
3315 | } | |
3316 | ||
3317 | /* | |
3318 | * Nested compound types: Only array of structures and variants are | |
3319 | * currently supported. | |
3320 | */ | |
437d5aa5 | 3321 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3322 | switch (elem_type->type) { |
3323 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3324 | case lttng_kernel_type_struct: |
3325 | case lttng_kernel_type_variant: | |
3326 | ret = _lttng_type_statedump(session, elem_type, | |
3327 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3328 | if (ret) |
3329 | return ret; | |
3330 | break; | |
ceabb767 | 3331 | |
f513b2bf MD |
3332 | default: |
3333 | return -EINVAL; | |
3334 | } | |
3335 | ret = lttng_metadata_printf(session, | |
3336 | " _%s[ _%s ];\n", | |
3337 | field->name, | |
51ef4536 | 3338 | length_name); |
f513b2bf MD |
3339 | return ret; |
3340 | } | |
3341 | ||
141ddf28 MD |
3342 | /* |
3343 | * Must be called with sessions_mutex held. | |
3344 | */ | |
3345 | static | |
8cdc1a81 | 3346 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3347 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3348 | size_t nesting) |
3349 | { | |
d96a4a7a | 3350 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3351 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3352 | int ret; |
3353 | unsigned int i, nr_entries; | |
3354 | ||
437d5aa5 | 3355 | container_type = type->container_type; |
12bb2edb | 3356 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3357 | ret = -EINVAL; |
3358 | goto end; | |
3359 | } | |
437d5aa5 | 3360 | enum_desc = type->desc; |
141ddf28 MD |
3361 | nr_entries = enum_desc->nr_entries; |
3362 | ||
3363 | ret = print_tabs(session, nesting); | |
3364 | if (ret) | |
3365 | goto end; | |
ceabb767 MD |
3366 | ret = lttng_metadata_printf(session, "enum : "); |
3367 | if (ret) | |
3368 | goto end; | |
437d5aa5 MD |
3369 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3370 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3371 | if (ret) |
ceabb767 MD |
3372 | goto end; |
3373 | ret = lttng_metadata_printf(session, " {\n"); | |
3374 | if (ret) | |
3375 | goto end; | |
141ddf28 MD |
3376 | /* Dump all entries */ |
3377 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3378 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3379 | int j, len; |
3380 | ||
3381 | ret = print_tabs(session, nesting + 1); | |
3382 | if (ret) | |
3383 | goto end; | |
3384 | ret = lttng_metadata_printf(session, | |
3385 | "\""); | |
3386 | if (ret) | |
3387 | goto end; | |
3388 | len = strlen(entry->string); | |
3389 | /* Escape the character '"' */ | |
3390 | for (j = 0; j < len; j++) { | |
3391 | char c = entry->string[j]; | |
3392 | ||
3393 | switch (c) { | |
3394 | case '"': | |
3395 | ret = lttng_metadata_printf(session, | |
3396 | "\\\""); | |
3397 | break; | |
3398 | case '\\': | |
3399 | ret = lttng_metadata_printf(session, | |
3400 | "\\\\"); | |
3401 | break; | |
3402 | default: | |
3403 | ret = lttng_metadata_printf(session, | |
3404 | "%c", c); | |
3405 | break; | |
3406 | } | |
3407 | if (ret) | |
3408 | goto end; | |
3409 | } | |
08ad1061 PP |
3410 | ret = lttng_metadata_printf(session, "\""); |
3411 | if (ret) | |
3412 | goto end; | |
3413 | ||
3414 | if (entry->options.is_auto) { | |
3415 | ret = lttng_metadata_printf(session, ",\n"); | |
3416 | if (ret) | |
3417 | goto end; | |
141ddf28 | 3418 | } else { |
7c559490 MD |
3419 | ret = lttng_metadata_printf(session, |
3420 | " = "); | |
3421 | if (ret) | |
3422 | goto end; | |
3423 | if (entry->start.signedness) | |
141ddf28 | 3424 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3425 | "%lld", (long long) entry->start.value); |
3426 | else | |
3427 | ret = lttng_metadata_printf(session, | |
3428 | "%llu", entry->start.value); | |
3429 | if (ret) | |
3430 | goto end; | |
3431 | if (entry->start.signedness == entry->end.signedness && | |
3432 | entry->start.value | |
3433 | == entry->end.value) { | |
141ddf28 | 3434 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3435 | ",\n"); |
3436 | } else { | |
3437 | if (entry->end.signedness) { | |
3438 | ret = lttng_metadata_printf(session, | |
3439 | " ... %lld,\n", | |
3440 | (long long) entry->end.value); | |
3441 | } else { | |
3442 | ret = lttng_metadata_printf(session, | |
3443 | " ... %llu,\n", | |
3444 | entry->end.value); | |
3445 | } | |
141ddf28 | 3446 | } |
7c559490 MD |
3447 | if (ret) |
3448 | goto end; | |
141ddf28 | 3449 | } |
141ddf28 MD |
3450 | } |
3451 | ret = print_tabs(session, nesting); | |
3452 | if (ret) | |
3453 | goto end; | |
ceabb767 | 3454 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3455 | end: |
3456 | return ret; | |
3457 | } | |
3458 | ||
d83004aa JD |
3459 | /* |
3460 | * Must be called with sessions_mutex held. | |
3461 | */ | |
c099397a | 3462 | static |
8cdc1a81 | 3463 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3464 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3465 | size_t nesting) |
3466 | { | |
3467 | int ret; | |
437d5aa5 | 3468 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3469 | |
437d5aa5 MD |
3470 | enum_type = lttng_kernel_get_type_enum(field->type); |
3471 | WARN_ON_ONCE(!enum_type); | |
3472 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3473 | if (ret) |
3474 | return ret; | |
3475 | return lttng_field_name_statedump(session, field, nesting); | |
3476 | } | |
3477 | ||
3478 | static | |
8cdc1a81 | 3479 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3480 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3481 | size_t nesting) |
3482 | { | |
3483 | int ret; | |
3484 | ||
437d5aa5 MD |
3485 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3486 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3487 | if (ret) |
3488 | return ret; | |
3489 | return lttng_field_name_statedump(session, field, nesting); | |
3490 | } | |
3491 | ||
3492 | static | |
8cdc1a81 | 3493 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3494 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3495 | size_t nesting) |
3496 | { | |
3497 | int ret; | |
3498 | ||
ceabb767 MD |
3499 | /* Default encoding is UTF8 */ |
3500 | ret = print_tabs(session, nesting); | |
3501 | if (ret) | |
3502 | return ret; | |
3503 | ret = lttng_metadata_printf(session, | |
3504 | "string%s", | |
437d5aa5 | 3505 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3506 | " { encoding = ASCII; }" : ""); |
3507 | return ret; | |
3508 | } | |
3509 | ||
3510 | static | |
8cdc1a81 | 3511 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3512 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3513 | size_t nesting) |
ceabb767 | 3514 | { |
437d5aa5 | 3515 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3516 | int ret; |
3517 | ||
437d5aa5 MD |
3518 | string_type = lttng_kernel_get_type_string(field->type); |
3519 | WARN_ON_ONCE(!string_type); | |
3520 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3521 | if (ret) |
3522 | return ret; | |
3523 | return lttng_field_name_statedump(session, field, nesting); | |
3524 | } | |
3525 | ||
3526 | /* | |
3527 | * Must be called with sessions_mutex held. | |
3528 | */ | |
3529 | static | |
8cdc1a81 | 3530 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3531 | const struct lttng_kernel_type_common *type, |
3532 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3533 | size_t nesting) |
c099397a | 3534 | { |
c099397a | 3535 | int ret = 0; |
c099397a | 3536 | |
12bb2edb MD |
3537 | switch (type->type) { |
3538 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3539 | ret = _lttng_integer_type_statedump(session, |
3540 | lttng_kernel_get_type_integer(type), | |
3541 | parent_encoding, nesting); | |
8070f5c0 | 3542 | break; |
437d5aa5 MD |
3543 | case lttng_kernel_type_enum: |
3544 | ret = _lttng_enum_type_statedump(session, | |
3545 | lttng_kernel_get_type_enum(type), | |
3546 | nesting); | |
8070f5c0 | 3547 | break; |
12bb2edb | 3548 | case lttng_kernel_type_string: |
437d5aa5 MD |
3549 | ret = _lttng_string_type_statedump(session, |
3550 | lttng_kernel_get_type_string(type), | |
3551 | nesting); | |
ceabb767 | 3552 | break; |
437d5aa5 MD |
3553 | case lttng_kernel_type_struct: |
3554 | ret = _lttng_struct_type_statedump(session, | |
3555 | lttng_kernel_get_type_struct(type), | |
3556 | nesting); | |
8070f5c0 | 3557 | break; |
437d5aa5 MD |
3558 | case lttng_kernel_type_variant: |
3559 | ret = _lttng_variant_type_statedump(session, | |
3560 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3561 | nesting, NULL); |
ceabb767 MD |
3562 | break; |
3563 | ||
3564 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3565 | case lttng_kernel_type_array: |
3566 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3567 | default: |
3568 | WARN_ON_ONCE(1); | |
3569 | return -EINVAL; | |
8070f5c0 | 3570 | } |
ceabb767 MD |
3571 | return ret; |
3572 | } | |
8070f5c0 | 3573 | |
ceabb767 MD |
3574 | /* |
3575 | * Must be called with sessions_mutex held. | |
3576 | */ | |
3577 | static | |
8cdc1a81 | 3578 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3579 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3580 | size_t nesting, |
3581 | const char **prev_field_name_p) | |
ceabb767 | 3582 | { |
51ef4536 | 3583 | const char *prev_field_name = NULL; |
ceabb767 | 3584 | int ret = 0; |
27d2368e | 3585 | |
51ef4536 MD |
3586 | if (prev_field_name_p) |
3587 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3588 | switch (field->type->type) { |
12bb2edb | 3589 | case lttng_kernel_type_integer: |
ceabb767 MD |
3590 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3591 | break; | |
437d5aa5 | 3592 | case lttng_kernel_type_enum: |
ceabb767 | 3593 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3594 | break; |
12bb2edb | 3595 | case lttng_kernel_type_string: |
ceabb767 | 3596 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3597 | break; |
437d5aa5 | 3598 | case lttng_kernel_type_struct: |
ceabb767 | 3599 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3600 | break; |
437d5aa5 | 3601 | case lttng_kernel_type_array: |
ceabb767 | 3602 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3603 | break; |
437d5aa5 | 3604 | case lttng_kernel_type_sequence: |
51ef4536 | 3605 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3606 | break; |
437d5aa5 | 3607 | case lttng_kernel_type_variant: |
51ef4536 | 3608 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3609 | break; |
f513b2bf | 3610 | |
8070f5c0 MD |
3611 | default: |
3612 | WARN_ON_ONCE(1); | |
3613 | return -EINVAL; | |
3614 | } | |
51ef4536 MD |
3615 | if (prev_field_name_p) |
3616 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3617 | return ret; |
3618 | } | |
3619 | ||
3620 | static | |
8cdc1a81 | 3621 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3622 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3623 | { |
51ef4536 | 3624 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3625 | int ret = 0; |
3626 | int i; | |
3627 | ||
3628 | if (!ctx) | |
3629 | return 0; | |
3630 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3631 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3632 | |
51ef4536 | 3633 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3634 | if (ret) |
3635 | return ret; | |
3636 | } | |
3637 | return ret; | |
3638 | } | |
3639 | ||
3640 | static | |
8cdc1a81 | 3641 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3642 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3643 | { |
51ef4536 | 3644 | const char *prev_field_name = NULL; |
a67ba386 | 3645 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3646 | int ret = 0; |
3647 | int i; | |
3648 | ||
6c8c025b MD |
3649 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3650 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3651 | |
51ef4536 | 3652 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3653 | if (ret) |
3654 | return ret; | |
c099397a MD |
3655 | } |
3656 | return ret; | |
3657 | } | |
3658 | ||
d83004aa JD |
3659 | /* |
3660 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3661 | * The entire event metadata is printed as a single atomic metadata |
3662 | * transaction. | |
d83004aa | 3663 | */ |
c099397a | 3664 | static |
8cdc1a81 | 3665 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3666 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3667 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3668 | { |
3669 | int ret = 0; | |
3670 | ||
a67ba386 | 3671 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3672 | return 0; |
f7d06400 | 3673 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3674 | return 0; |
3675 | ||
8b97fd42 MD |
3676 | lttng_metadata_begin(session); |
3677 | ||
c099397a MD |
3678 | ret = lttng_metadata_printf(session, |
3679 | "event {\n" | |
ae734547 | 3680 | " name = \"%s\";\n" |
c099397a | 3681 | " id = %u;\n" |
b9074a1b | 3682 | " stream_id = %u;\n", |
a67ba386 MD |
3683 | event_recorder->priv->parent.desc->event_name, |
3684 | event_recorder->priv->id, | |
f7d06400 | 3685 | event_recorder->chan->priv->id); |
c099397a MD |
3686 | if (ret) |
3687 | goto end; | |
3688 | ||
8070f5c0 | 3689 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3690 | " fields := struct {\n" |
3691 | ); | |
3692 | if (ret) | |
3693 | goto end; | |
3694 | ||
a67ba386 | 3695 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3696 | if (ret) |
3697 | goto end; | |
3698 | ||
3699 | /* | |
3700 | * LTTng space reservation can only reserve multiples of the | |
3701 | * byte size. | |
3702 | */ | |
3703 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3704 | " };\n" |
3705 | "};\n\n"); | |
c099397a MD |
3706 | if (ret) |
3707 | goto end; | |
3708 | ||
a67ba386 | 3709 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3710 | end: |
8b97fd42 | 3711 | lttng_metadata_end(session); |
c099397a MD |
3712 | return ret; |
3713 | ||
3714 | } | |
3715 | ||
d83004aa JD |
3716 | /* |
3717 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3718 | * The entire channel metadata is printed as a single atomic metadata |
3719 | * transaction. | |
d83004aa | 3720 | */ |
c099397a | 3721 | static |
8cdc1a81 | 3722 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3723 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3724 | { |
3725 | int ret = 0; | |
3726 | ||
f7d06400 | 3727 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3728 | return 0; |
d83004aa | 3729 | |
f7d06400 | 3730 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3731 | return 0; |
3732 | ||
8b97fd42 MD |
3733 | lttng_metadata_begin(session); |
3734 | ||
f7d06400 | 3735 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3736 | ret = lttng_metadata_printf(session, |
3737 | "stream {\n" | |
3738 | " id = %u;\n" | |
9115fbdc | 3739 | " event.header := %s;\n" |
b9074a1b | 3740 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3741 | chan->priv->id, |
3742 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3743 | "struct event_header_large"); |
3744 | if (ret) | |
3745 | goto end; | |
3746 | ||
f7d06400 | 3747 | if (chan->priv->ctx) { |
b9074a1b MD |
3748 | ret = lttng_metadata_printf(session, |
3749 | " event.context := struct {\n"); | |
3750 | if (ret) | |
3751 | goto end; | |
3752 | } | |
f7d06400 | 3753 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3754 | if (ret) |
3755 | goto end; | |
f7d06400 | 3756 | if (chan->priv->ctx) { |
b9074a1b MD |
3757 | ret = lttng_metadata_printf(session, |
3758 | " };\n"); | |
3759 | if (ret) | |
3760 | goto end; | |
3761 | } | |
8070f5c0 MD |
3762 | |
3763 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3764 | "};\n\n"); |
8070f5c0 | 3765 | |
f7d06400 | 3766 | chan->priv->metadata_dumped = 1; |
c099397a | 3767 | end: |
8b97fd42 | 3768 | lttng_metadata_end(session); |
c099397a MD |
3769 | return ret; |
3770 | } | |
3771 | ||
d83004aa JD |
3772 | /* |
3773 | * Must be called with sessions_mutex held. | |
3774 | */ | |
9115fbdc | 3775 | static |
8cdc1a81 | 3776 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3777 | { |
3778 | return lttng_metadata_printf(session, | |
3779 | "struct packet_context {\n" | |
a3ccff4f MD |
3780 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3781 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3782 | " uint64_t content_size;\n" |
3783 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3784 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3785 | " unsigned long events_discarded;\n" |
9115fbdc | 3786 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3787 | "};\n\n" |
9115fbdc MD |
3788 | ); |
3789 | } | |
3790 | ||
3791 | /* | |
3792 | * Compact header: | |
3793 | * id: range: 0 - 30. | |
3794 | * id 31 is reserved to indicate an extended header. | |
3795 | * | |
3796 | * Large header: | |
3797 | * id: range: 0 - 65534. | |
3798 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3799 | * |
3800 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3801 | */ |
3802 | static | |
8cdc1a81 | 3803 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3804 | { |
3805 | return lttng_metadata_printf(session, | |
3806 | "struct event_header_compact {\n" | |
3807 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3808 | " variant <id> {\n" | |
3809 | " struct {\n" | |
a3ccff4f | 3810 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3811 | " } compact;\n" |
3812 | " struct {\n" | |
3813 | " uint32_t id;\n" | |
a3ccff4f | 3814 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3815 | " } extended;\n" |
3816 | " } v;\n" | |
3817 | "} align(%u);\n" | |
3818 | "\n" | |
3819 | "struct event_header_large {\n" | |
3820 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3821 | " variant <id> {\n" | |
3822 | " struct {\n" | |
a3ccff4f | 3823 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3824 | " } compact;\n" |
3825 | " struct {\n" | |
3826 | " uint32_t id;\n" | |
a3ccff4f | 3827 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3828 | " } extended;\n" |
3829 | " } v;\n" | |
3830 | "} align(%u);\n\n", | |
a90917c3 MD |
3831 | lttng_alignof(uint32_t) * CHAR_BIT, |
3832 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3833 | ); |
3834 | } | |
3835 | ||
a3ccff4f MD |
3836 | /* |
3837 | * Approximation of NTP time of day to clock monotonic correlation, | |
3838 | * taken at start of trace. | |
3839 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3840 | * in future versions. | |
5283350b MD |
3841 | * This function may return a negative offset. It may happen if the |
3842 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3843 | * |
3844 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3845 | * y2038 compliant. | |
a3ccff4f MD |
3846 | */ |
3847 | static | |
8967b2a3 | 3848 | int64_t measure_clock_offset(void) |
a3ccff4f | 3849 | { |
dcb93448 | 3850 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3851 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3852 | int64_t offset; |
a3ccff4f | 3853 | unsigned long flags; |
3636085f MJ |
3854 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3855 | struct timespec64 rts = { 0, 0 }; | |
3856 | #else | |
3857 | struct timespec rts = { 0, 0 }; | |
3858 | #endif | |
a3ccff4f MD |
3859 | |
3860 | /* Disable interrupts to increase correlation precision. */ | |
3861 | local_irq_save(flags); | |
3862 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3863 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3864 | ktime_get_real_ts64(&rts); | |
3865 | #else | |
216b6baa | 3866 | getnstimeofday(&rts); |
3636085f | 3867 | #endif |
a3ccff4f MD |
3868 | monotonic[1] = trace_clock_read64(); |
3869 | local_irq_restore(flags); | |
3870 | ||
dcb93448 | 3871 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3872 | realtime = (uint64_t) rts.tv_sec * tcf; |
3873 | if (tcf == NSEC_PER_SEC) { | |
3874 | realtime += rts.tv_nsec; | |
3875 | } else { | |
3876 | uint64_t n = rts.tv_nsec * tcf; | |
3877 | ||
3878 | do_div(n, NSEC_PER_SEC); | |
3879 | realtime += n; | |
3880 | } | |
dcb93448 | 3881 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3882 | return offset; |
3883 | } | |
3884 | ||
3eb95be4 | 3885 | static |
8cdc1a81 | 3886 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3887 | { |
0f3eaad4 | 3888 | int ret = 0; |
3eb95be4 JR |
3889 | size_t i; |
3890 | char cur; | |
3891 | ||
3892 | i = 0; | |
3893 | cur = string[i]; | |
3894 | while (cur != '\0') { | |
3895 | switch (cur) { | |
3896 | case '\n': | |
3897 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3898 | break; | |
3899 | case '\\': | |
3900 | case '"': | |
3901 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3902 | if (ret) | |
3903 | goto error; | |
3904 | /* We still print the current char */ | |
c190d76e | 3905 | lttng_fallthrough; |
3eb95be4 JR |
3906 | default: |
3907 | ret = lttng_metadata_printf(session, "%c", cur); | |
3908 | break; | |
3909 | } | |
3910 | ||
3911 | if (ret) | |
3912 | goto error; | |
3913 | ||
3914 | cur = string[++i]; | |
3915 | } | |
3916 | error: | |
3917 | return ret; | |
3918 | } | |
3919 | ||
3920 | static | |
8cdc1a81 | 3921 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3922 | const char *field_value) |
3eb95be4 JR |
3923 | { |
3924 | int ret; | |
3925 | ||
1c88f269 | 3926 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3927 | if (ret) |
3928 | goto error; | |
3929 | ||
1c88f269 | 3930 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3931 | if (ret) |
3932 | goto error; | |
3933 | ||
3934 | ret = lttng_metadata_printf(session, "\";\n"); | |
3935 | ||
3936 | error: | |
3937 | return ret; | |
3938 | } | |
3939 | ||
c099397a MD |
3940 | /* |
3941 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3942 | * Must be called with sessions_mutex held. |
c099397a MD |
3943 | */ |
3944 | static | |
8cdc1a81 | 3945 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3946 | { |
8cdc1a81 | 3947 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3948 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3949 | const char *product_uuid; |
f7d06400 | 3950 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3951 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3952 | int ret = 0; |
3953 | ||
585e5dcc | 3954 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3955 | return 0; |
8b97fd42 MD |
3956 | |
3957 | lttng_metadata_begin(session); | |
3958 | ||
8cdc1a81 | 3959 | if (session->priv->metadata_dumped) |
c099397a | 3960 | goto skip_session; |
c099397a | 3961 | |
d793d5e1 | 3962 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3963 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3964 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3965 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3966 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3967 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3968 | |
3969 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3970 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3971 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3972 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3973 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3974 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3975 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3976 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3977 | "\n" |
3978 | "trace {\n" | |
3979 | " major = %u;\n" | |
3980 | " minor = %u;\n" | |
30bdb6e4 | 3981 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3982 | " byte_order = %s;\n" |
3983 | " packet.header := struct {\n" | |
3984 | " uint32_t magic;\n" | |
1ec3f75a | 3985 | " uint8_t uuid[16];\n" |
d793d5e1 | 3986 | " uint32_t stream_id;\n" |
5594698f | 3987 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3988 | " };\n" |
d793d5e1 | 3989 | "};\n\n", |
a90917c3 MD |
3990 | lttng_alignof(uint8_t) * CHAR_BIT, |
3991 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3992 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3993 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3994 | sizeof(unsigned long) * CHAR_BIT, |
3995 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3996 | CTF_SPEC_MAJOR, |
3997 | CTF_SPEC_MINOR, | |
d793d5e1 | 3998 | uuid_s, |
5214fa50 | 3999 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
4000 | "be" |
4001 | #else | |
4002 | "le" | |
4003 | #endif | |
4004 | ); | |
4005 | if (ret) | |
4006 | goto end; | |
4007 | ||
99dc9597 MD |
4008 | ret = lttng_metadata_printf(session, |
4009 | "env {\n" | |
a6058143 | 4010 | " hostname = \"%s\";\n" |
c6c9e10f | 4011 | " domain = \"kernel\";\n" |
99dc9597 | 4012 | " sysname = \"%s\";\n" |
c6c9e10f MD |
4013 | " kernel_release = \"%s\";\n" |
4014 | " kernel_version = \"%s\";\n" | |
4015 | " tracer_name = \"lttng-modules\";\n" | |
4016 | " tracer_major = %d;\n" | |
4017 | " tracer_minor = %d;\n" | |
4018 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 4019 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 4020 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
4021 | utsname()->sysname, |
4022 | utsname()->release, | |
c6c9e10f MD |
4023 | utsname()->version, |
4024 | LTTNG_MODULES_MAJOR_VERSION, | |
4025 | LTTNG_MODULES_MINOR_VERSION, | |
4026 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
4027 | ); |
4028 | if (ret) | |
4029 | goto end; | |
4030 | ||
8cdc1a81 | 4031 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
4032 | if (ret) |
4033 | goto end; | |
4034 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 4035 | session->priv->creation_time); |
3eb95be4 JR |
4036 | if (ret) |
4037 | goto end; | |
4038 | ||
c88f762e GB |
4039 | /* Add the product UUID to the 'env' section */ |
4040 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4041 | if (product_uuid) { | |
4042 | ret = lttng_metadata_printf(session, | |
4043 | " product_uuid = \"%s\";\n", | |
4044 | product_uuid | |
4045 | ); | |
4046 | if (ret) | |
4047 | goto end; | |
4048 | } | |
4049 | ||
4050 | /* Close the 'env' section */ | |
3eb95be4 JR |
4051 | ret = lttng_metadata_printf(session, "};\n\n"); |
4052 | if (ret) | |
4053 | goto end; | |
4054 | ||
a3ccff4f MD |
4055 | ret = lttng_metadata_printf(session, |
4056 | "clock {\n" | |
2754583e MD |
4057 | " name = \"%s\";\n", |
4058 | trace_clock_name() | |
a82c63f1 MD |
4059 | ); |
4060 | if (ret) | |
4061 | goto end; | |
4062 | ||
4063 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4064 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4065 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4066 | clock_uuid_s |
4067 | ); | |
4068 | if (ret) | |
4069 | goto end; | |
4070 | } | |
4071 | ||
4072 | ret = lttng_metadata_printf(session, | |
2754583e | 4073 | " description = \"%s\";\n" |
a3ccff4f MD |
4074 | " freq = %llu; /* Frequency, in Hz */\n" |
4075 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4076 | " offset = %lld;\n" |
a3ccff4f | 4077 | "};\n\n", |
2754583e | 4078 | trace_clock_description(), |
a3ccff4f | 4079 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4080 | (long long) measure_clock_offset() |
a3ccff4f MD |
4081 | ); |
4082 | if (ret) | |
4083 | goto end; | |
4084 | ||
4085 | ret = lttng_metadata_printf(session, | |
4086 | "typealias integer {\n" | |
4087 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4088 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4089 | "} := uint27_clock_monotonic_t;\n" |
4090 | "\n" | |
4091 | "typealias integer {\n" | |
4092 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4093 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4094 | "} := uint32_clock_monotonic_t;\n" |
4095 | "\n" | |
4096 | "typealias integer {\n" | |
4097 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4098 | " map = clock.%s.value;\n" |
a3ccff4f | 4099 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4100 | trace_clock_name(), |
a3ccff4f | 4101 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4102 | trace_clock_name(), |
4103 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4104 | trace_clock_name() | |
a3ccff4f MD |
4105 | ); |
4106 | if (ret) | |
4107 | goto end; | |
4108 | ||
a90917c3 | 4109 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4110 | if (ret) |
4111 | goto end; | |
4112 | ||
a90917c3 | 4113 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4114 | if (ret) |
4115 | goto end; | |
4116 | ||
c099397a | 4117 | skip_session: |
f7d06400 MD |
4118 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4119 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4120 | if (ret) |
4121 | goto end; | |
4122 | } | |
4123 | ||
8cdc1a81 | 4124 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4125 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4126 | event_recorder_priv->pub); | |
c099397a MD |
4127 | if (ret) |
4128 | goto end; | |
4129 | } | |
8cdc1a81 | 4130 | session->priv->metadata_dumped = 1; |
c099397a | 4131 | end: |
8b97fd42 | 4132 | lttng_metadata_end(session); |
c099397a MD |
4133 | return ret; |
4134 | } | |
4135 | ||
c0e31d2e | 4136 | /** |
a90917c3 | 4137 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4138 | * @transport: transport structure |
4139 | * | |
4140 | * Registers a transport which can be used as output to extract the data out of | |
4141 | * LTTng. The module calling this registration function must ensure that no | |
4142 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4143 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4144 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4145 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4146 | * after its registration must it synchronize the TLBs. |
4147 | */ | |
a90917c3 | 4148 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4149 | { |
4150 | /* | |
4151 | * Make sure no page fault can be triggered by the module about to be | |
4152 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4153 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4154 | */ |
263b6c88 | 4155 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4156 | |
4157 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4158 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4159 | mutex_unlock(&sessions_mutex); |
4160 | } | |
a90917c3 | 4161 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4162 | |
4163 | /** | |
a90917c3 | 4164 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4165 | * @transport: transport structure |
4166 | */ | |
a90917c3 | 4167 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4168 | { |
4169 | mutex_lock(&sessions_mutex); | |
4170 | list_del(&transport->node); | |
4171 | mutex_unlock(&sessions_mutex); | |
4172 | } | |
a90917c3 | 4173 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4174 | |
a101fa10 MD |
4175 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4176 | { | |
4177 | /* | |
4178 | * Make sure no page fault can be triggered by the module about to be | |
4179 | * registered. We deal with this here so we don't have to call | |
4180 | * vmalloc_sync_mappings() in each module's init. | |
4181 | */ | |
4182 | wrapper_vmalloc_sync_mappings(); | |
4183 | ||
4184 | mutex_lock(&sessions_mutex); | |
4185 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4186 | mutex_unlock(&sessions_mutex); | |
4187 | } | |
4188 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4189 | ||
4190 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4191 | { | |
4192 | mutex_lock(&sessions_mutex); | |
4193 | list_del(&transport->node); | |
4194 | mutex_unlock(&sessions_mutex); | |
4195 | } | |
4196 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4197 | ||
5f4c791e | 4198 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4199 | |
4200 | enum cpuhp_state lttng_hp_prepare; | |
4201 | enum cpuhp_state lttng_hp_online; | |
4202 | ||
4203 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4204 | { | |
4205 | struct lttng_cpuhp_node *lttng_node; | |
4206 | ||
4207 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4208 | switch (lttng_node->component) { | |
4209 | case LTTNG_RING_BUFFER_FRONTEND: | |
4210 | return 0; | |
4211 | case LTTNG_RING_BUFFER_BACKEND: | |
4212 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4213 | case LTTNG_RING_BUFFER_ITER: | |
4214 | return 0; | |
4215 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4216 | return 0; | |
4217 | default: | |
4218 | return -EINVAL; | |
4219 | } | |
4220 | } | |
4221 | ||
4222 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4223 | { | |
4224 | struct lttng_cpuhp_node *lttng_node; | |
4225 | ||
4226 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4227 | switch (lttng_node->component) { | |
4228 | case LTTNG_RING_BUFFER_FRONTEND: | |
4229 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4230 | case LTTNG_RING_BUFFER_BACKEND: | |
4231 | return 0; | |
4232 | case LTTNG_RING_BUFFER_ITER: | |
4233 | return 0; | |
4234 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4235 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4236 | default: | |
4237 | return -EINVAL; | |
4238 | } | |
4239 | } | |
4240 | ||
4241 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4242 | { | |
4243 | struct lttng_cpuhp_node *lttng_node; | |
4244 | ||
4245 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4246 | switch (lttng_node->component) { | |
4247 | case LTTNG_RING_BUFFER_FRONTEND: | |
4248 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4249 | case LTTNG_RING_BUFFER_BACKEND: | |
4250 | return 0; | |
4251 | case LTTNG_RING_BUFFER_ITER: | |
4252 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4253 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4254 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4255 | default: | |
4256 | return -EINVAL; | |
4257 | } | |
4258 | } | |
4259 | ||
4260 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4261 | { | |
4262 | struct lttng_cpuhp_node *lttng_node; | |
4263 | ||
4264 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4265 | switch (lttng_node->component) { | |
4266 | case LTTNG_RING_BUFFER_FRONTEND: | |
4267 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4268 | case LTTNG_RING_BUFFER_BACKEND: | |
4269 | return 0; | |
4270 | case LTTNG_RING_BUFFER_ITER: | |
4271 | return 0; | |
4272 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4273 | return 0; | |
4274 | default: | |
4275 | return -EINVAL; | |
4276 | } | |
4277 | } | |
4278 | ||
4279 | static int __init lttng_init_cpu_hotplug(void) | |
4280 | { | |
4281 | int ret; | |
4282 | ||
4283 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4284 | lttng_hotplug_prepare, | |
4285 | lttng_hotplug_dead); | |
4286 | if (ret < 0) { | |
4287 | return ret; | |
4288 | } | |
4289 | lttng_hp_prepare = ret; | |
4290 | lttng_rb_set_hp_prepare(ret); | |
4291 | ||
4292 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4293 | lttng_hotplug_online, | |
4294 | lttng_hotplug_offline); | |
4295 | if (ret < 0) { | |
4296 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4297 | lttng_hp_prepare = 0; | |
4298 | return ret; | |
4299 | } | |
4300 | lttng_hp_online = ret; | |
4301 | lttng_rb_set_hp_online(ret); | |
4302 | ||
4303 | return 0; | |
4304 | } | |
4305 | ||
4306 | static void __exit lttng_exit_cpu_hotplug(void) | |
4307 | { | |
4308 | lttng_rb_set_hp_online(0); | |
4309 | cpuhp_remove_multi_state(lttng_hp_online); | |
4310 | lttng_rb_set_hp_prepare(0); | |
4311 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4312 | } | |
4313 | ||
5f4c791e | 4314 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4315 | static int lttng_init_cpu_hotplug(void) |
4316 | { | |
4317 | return 0; | |
4318 | } | |
4319 | static void lttng_exit_cpu_hotplug(void) | |
4320 | { | |
4321 | } | |
5f4c791e | 4322 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4323 | |
a90917c3 | 4324 | static int __init lttng_events_init(void) |
4e3c1b9b | 4325 | { |
1c25284c MD |
4326 | int ret; |
4327 | ||
453b2495 JD |
4328 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4329 | if (ret) | |
4330 | return ret; | |
389d7070 | 4331 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4332 | if (ret) |
4333 | return ret; | |
4334 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4335 | if (ret) |
4336 | return ret; | |
4337 | ret = lttng_probes_init(); | |
389d7070 MD |
4338 | if (ret) |
4339 | return ret; | |
07dfc1d0 | 4340 | ret = lttng_context_init(); |
20591cf7 MD |
4341 | if (ret) |
4342 | return ret; | |
07dfc1d0 MD |
4343 | ret = lttng_tracepoint_init(); |
4344 | if (ret) | |
4345 | goto error_tp; | |
a67ba386 MD |
4346 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4347 | if (!event_recorder_cache) { | |
20591cf7 | 4348 | ret = -ENOMEM; |
a67ba386 | 4349 | goto error_kmem_event_recorder; |
dffef45d | 4350 | } |
a67ba386 MD |
4351 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4352 | if (!event_recorder_private_cache) { | |
4353 | ret = -ENOMEM; | |
4354 | goto error_kmem_event_recorder_private; | |
4355 | } | |
4356 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4357 | if (!event_notifier_cache) { |
4358 | ret = -ENOMEM; | |
4359 | goto error_kmem_event_notifier; | |
20591cf7 | 4360 | } |
a67ba386 MD |
4361 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4362 | if (!event_notifier_private_cache) { | |
4363 | ret = -ENOMEM; | |
4364 | goto error_kmem_event_notifier_private; | |
4365 | } | |
80996790 | 4366 | ret = lttng_abi_init(); |
02119ee5 MD |
4367 | if (ret) |
4368 | goto error_abi; | |
0c956676 MD |
4369 | ret = lttng_logger_init(); |
4370 | if (ret) | |
4371 | goto error_logger; | |
1e367326 MD |
4372 | ret = lttng_init_cpu_hotplug(); |
4373 | if (ret) | |
4374 | goto error_hotplug; | |
101215b7 | 4375 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4376 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4377 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4378 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4379 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4380 | LTTNG_VERSION_NAME, |
4381 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4382 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4383 | #else | |
4384 | "", | |
4385 | #endif | |
4386 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4387 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4388 | #else | |
4389 | ""); | |
4390 | #endif | |
c1551e57 MJ |
4391 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4392 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4393 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4394 | return 0; |
0c956676 | 4395 | |
1e367326 MD |
4396 | error_hotplug: |
4397 | lttng_logger_exit(); | |
0c956676 MD |
4398 | error_logger: |
4399 | lttng_abi_exit(); | |
02119ee5 | 4400 | error_abi: |
a67ba386 MD |
4401 | kmem_cache_destroy(event_notifier_private_cache); |
4402 | error_kmem_event_notifier_private: | |
dffef45d FD |
4403 | kmem_cache_destroy(event_notifier_cache); |
4404 | error_kmem_event_notifier: | |
a67ba386 MD |
4405 | kmem_cache_destroy(event_recorder_private_cache); |
4406 | error_kmem_event_recorder_private: | |
4407 | kmem_cache_destroy(event_recorder_cache); | |
4408 | error_kmem_event_recorder: | |
20591cf7 | 4409 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4410 | error_tp: |
4411 | lttng_context_exit(); | |
101215b7 | 4412 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4413 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4414 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4415 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4416 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4417 | LTTNG_VERSION_NAME, |
4418 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4419 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4420 | #else | |
4421 | "", | |
4422 | #endif | |
4423 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4424 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4425 | #else | |
4426 | ""); | |
4427 | #endif | |
1c25284c | 4428 | return ret; |
4e3c1b9b MD |
4429 | } |
4430 | ||
a90917c3 | 4431 | module_init(lttng_events_init); |
11b5a3c2 | 4432 | |
a90917c3 | 4433 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4434 | { |
8cdc1a81 | 4435 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4436 | |
1e367326 | 4437 | lttng_exit_cpu_hotplug(); |
0c956676 | 4438 | lttng_logger_exit(); |
80996790 | 4439 | lttng_abi_exit(); |
8cdc1a81 MD |
4440 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4441 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4442 | kmem_cache_destroy(event_recorder_cache); |
4443 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4444 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4445 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4446 | lttng_tracepoint_exit(); |
07dfc1d0 | 4447 | lttng_context_exit(); |
101215b7 | 4448 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4449 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4450 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4451 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4452 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4453 | LTTNG_VERSION_NAME, |
4454 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4455 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4456 | #else | |
4457 | "", | |
4458 | #endif | |
4459 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4460 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4461 | #else | |
4462 | ""); | |
4463 | #endif | |
4e3c1b9b | 4464 | } |
92e94819 | 4465 | |
a90917c3 | 4466 | module_exit(lttng_events_exit); |
11b5a3c2 | 4467 | |
7ca11e77 | 4468 | #include <generated/patches.h> |
101215b7 MJ |
4469 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4470 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4471 | #endif | |
4472 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4473 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4474 | #endif | |
92e94819 MD |
4475 | MODULE_LICENSE("GPL and additional rights"); |
4476 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4477 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4478 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4479 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4480 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4481 | LTTNG_MODULES_EXTRAVERSION); |