Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
8c6e7f13 | 27 | #include <linux/uaccess.h> |
a606b6e8 | 28 | #include <linux/vmalloc.h> |
c88f762e | 29 | #include <linux/dmi.h> |
3c997079 | 30 | |
c190d76e | 31 | #include <wrapper/compiler_attributes.h> |
a7008254 | 32 | #include <wrapper/uuid.h> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
34 | #include <wrapper/random.h> |
35 | #include <wrapper/tracepoint.h> | |
36 | #include <wrapper/list.h> | |
cbc19040 | 37 | #include <wrapper/types.h> |
2df37e95 MD |
38 | #include <lttng/kernel-version.h> |
39 | #include <lttng/events.h> | |
92bc1e23 | 40 | #include <lttng/events-internal.h> |
0b365677 | 41 | #include <lttng/lttng-bytecode.h> |
2df37e95 | 42 | #include <lttng/tracer.h> |
21f58fb7 | 43 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
44 | #include <lttng/abi-old.h> |
45 | #include <lttng/endian.h> | |
46 | #include <lttng/string-utils.h> | |
4a11ef1c | 47 | #include <lttng/utils.h> |
24591303 MD |
48 | #include <ringbuffer/backend.h> |
49 | #include <ringbuffer/frontend.h> | |
3636085f | 50 | #include <wrapper/time.h> |
4e3c1b9b | 51 | |
d83004aa JD |
52 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
53 | ||
4e3c1b9b | 54 | static LIST_HEAD(sessions); |
750b05f2 | 55 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 56 | static LIST_HEAD(lttng_transport_list); |
a101fa10 | 57 | static LIST_HEAD(lttng_counter_transport_list); |
d83004aa JD |
58 | /* |
59 | * Protect the sessions and metadata caches. | |
60 | */ | |
4e3c1b9b | 61 | static DEFINE_MUTEX(sessions_mutex); |
a67ba386 MD |
62 | static struct kmem_cache *event_recorder_cache; |
63 | static struct kmem_cache *event_recorder_private_cache; | |
dffef45d | 64 | static struct kmem_cache *event_notifier_cache; |
a67ba386 | 65 | static struct kmem_cache *event_notifier_private_cache; |
4e3c1b9b | 66 | |
8cdc1a81 MD |
67 | static void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session); |
68 | static void lttng_session_sync_event_enablers(struct lttng_kernel_session *session); | |
b01155ba | 69 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
7b25ab0e | 70 | static void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler); |
3c997079 | 71 | |
0648898e | 72 | static void _lttng_event_destroy(struct lttng_kernel_event_common *event); |
f7d06400 | 73 | static void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan); |
f0bcc14c | 74 | static int _lttng_event_unregister(struct lttng_kernel_event_common *event); |
c099397a | 75 | static |
8cdc1a81 | 76 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 77 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 78 | struct lttng_kernel_event_recorder *event); |
c099397a | 79 | static |
8cdc1a81 | 80 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session); |
d83004aa JD |
81 | static |
82 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 83 | static |
8cdc1a81 | 84 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
85 | const struct lttng_kernel_type_common *type, |
86 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
87 | size_t nesting); |
88 | static | |
8cdc1a81 | 89 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 90 | const struct lttng_kernel_event_field *field, |
51ef4536 | 91 | size_t nesting, const char **prev_field_name_p); |
c099397a | 92 | |
c099397a | 93 | void synchronize_trace(void) |
abcca994 | 94 | { |
05355f0b MJ |
95 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ |
96 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) | |
92da05ce MJ |
97 | synchronize_rcu(); |
98 | #else | |
abcca994 | 99 | synchronize_sched(); |
92da05ce MJ |
100 | #endif |
101 | ||
5f4c791e | 102 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) |
b8590f40 MD |
103 | #ifdef CONFIG_PREEMPT_RT_FULL |
104 | synchronize_rcu(); | |
105 | #endif | |
5f4c791e | 106 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
107 | #ifdef CONFIG_PREEMPT_RT |
108 | synchronize_rcu(); | |
109 | #endif | |
5f4c791e | 110 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
111 | } |
112 | ||
3c997079 MD |
113 | void lttng_lock_sessions(void) |
114 | { | |
115 | mutex_lock(&sessions_mutex); | |
116 | } | |
117 | ||
118 | void lttng_unlock_sessions(void) | |
119 | { | |
120 | mutex_unlock(&sessions_mutex); | |
121 | } | |
122 | ||
9fe593d2 FD |
123 | static struct lttng_transport *lttng_transport_find(const char *name) |
124 | { | |
125 | struct lttng_transport *transport; | |
126 | ||
127 | list_for_each_entry(transport, <tng_transport_list, node) { | |
128 | if (!strcmp(transport->name, name)) | |
129 | return transport; | |
130 | } | |
131 | return NULL; | |
132 | } | |
133 | ||
3c997079 MD |
134 | /* |
135 | * Called with sessions lock held. | |
136 | */ | |
137 | int lttng_session_active(void) | |
138 | { | |
8cdc1a81 | 139 | struct lttng_kernel_session_private *iter; |
3c997079 MD |
140 | |
141 | list_for_each_entry(iter, &sessions, list) { | |
8cdc1a81 | 142 | if (iter->pub->active) |
3c997079 MD |
143 | return 1; |
144 | } | |
145 | return 0; | |
146 | } | |
147 | ||
8cdc1a81 | 148 | struct lttng_kernel_session *lttng_session_create(void) |
4e3c1b9b | 149 | { |
8cdc1a81 MD |
150 | struct lttng_kernel_session *session; |
151 | struct lttng_kernel_session_private *session_priv; | |
d83004aa | 152 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 153 | int i; |
4e3c1b9b MD |
154 | |
155 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 156 | session = lttng_kvzalloc(sizeof(*session), GFP_KERNEL); |
4e3c1b9b | 157 | if (!session) |
d83004aa | 158 | goto err; |
8cdc1a81 MD |
159 | session_priv = lttng_kvzalloc(sizeof(*session_priv), GFP_KERNEL); |
160 | if (!session_priv) | |
161 | goto err_free_session; | |
162 | session->priv = session_priv; | |
163 | session_priv->pub = session; | |
164 | ||
165 | INIT_LIST_HEAD(&session_priv->chan); | |
166 | INIT_LIST_HEAD(&session_priv->events); | |
167 | lttng_guid_gen(&session_priv->uuid); | |
d83004aa JD |
168 | |
169 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
170 | GFP_KERNEL); | |
171 | if (!metadata_cache) | |
8cdc1a81 | 172 | goto err_free_session_private; |
0ca42eb7 | 173 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
174 | if (!metadata_cache->data) |
175 | goto err_free_cache; | |
176 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
177 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 178 | mutex_init(&metadata_cache->lock); |
8cdc1a81 | 179 | session_priv->metadata_cache = metadata_cache; |
d83004aa | 180 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); |
8cdc1a81 | 181 | memcpy(&metadata_cache->uuid, &session_priv->uuid, |
a36580d5 | 182 | sizeof(metadata_cache->uuid)); |
8cdc1a81 | 183 | INIT_LIST_HEAD(&session_priv->enablers_head); |
3c997079 | 184 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
8cdc1a81 MD |
185 | INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); |
186 | list_add(&session_priv->list, &sessions); | |
187 | ||
8c0393c3 MD |
188 | if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) |
189 | goto tracker_alloc_error; | |
190 | if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) | |
191 | goto tracker_alloc_error; | |
192 | if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) | |
193 | goto tracker_alloc_error; | |
194 | if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) | |
195 | goto tracker_alloc_error; | |
196 | if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) | |
197 | goto tracker_alloc_error; | |
198 | if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) | |
199 | goto tracker_alloc_error; | |
200 | ||
4e3c1b9b | 201 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 202 | |
4e3c1b9b | 203 | return session; |
d83004aa | 204 | |
8c0393c3 MD |
205 | tracker_alloc_error: |
206 | lttng_id_tracker_fini(&session->pid_tracker); | |
207 | lttng_id_tracker_fini(&session->vpid_tracker); | |
208 | lttng_id_tracker_fini(&session->uid_tracker); | |
209 | lttng_id_tracker_fini(&session->vuid_tracker); | |
210 | lttng_id_tracker_fini(&session->gid_tracker); | |
211 | lttng_id_tracker_fini(&session->vgid_tracker); | |
d83004aa JD |
212 | err_free_cache: |
213 | kfree(metadata_cache); | |
8cdc1a81 MD |
214 | err_free_session_private: |
215 | lttng_kvfree(session_priv); | |
d83004aa | 216 | err_free_session: |
48f5e0b5 | 217 | lttng_kvfree(session); |
d83004aa JD |
218 | err: |
219 | mutex_unlock(&sessions_mutex); | |
220 | return NULL; | |
221 | } | |
222 | ||
99f52fcc FD |
223 | static |
224 | struct lttng_counter_transport *lttng_counter_transport_find(const char *name) | |
225 | { | |
226 | struct lttng_counter_transport *transport; | |
227 | ||
228 | list_for_each_entry(transport, <tng_counter_transport_list, node) { | |
229 | if (!strcmp(transport->name, name)) | |
230 | return transport; | |
231 | } | |
232 | return NULL; | |
233 | } | |
234 | ||
235 | struct lttng_counter *lttng_kernel_counter_create( | |
236 | const char *counter_transport_name, | |
237 | size_t number_dimensions, const size_t *dimensions_sizes) | |
238 | { | |
239 | struct lttng_counter *counter = NULL; | |
240 | struct lttng_counter_transport *counter_transport = NULL; | |
241 | ||
242 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
243 | if (!counter_transport) { | |
244 | printk(KERN_WARNING "LTTng: counter transport %s not found.\n", | |
245 | counter_transport_name); | |
246 | goto notransport; | |
247 | } | |
248 | if (!try_module_get(counter_transport->owner)) { | |
249 | printk(KERN_WARNING "LTTng: Can't lock counter transport module.\n"); | |
250 | goto notransport; | |
251 | } | |
252 | ||
253 | counter = lttng_kvzalloc(sizeof(struct lttng_counter), GFP_KERNEL); | |
254 | if (!counter) | |
255 | goto nomem; | |
256 | ||
257 | /* Create event notifier error counter. */ | |
258 | counter->ops = &counter_transport->ops; | |
259 | counter->transport = counter_transport; | |
260 | ||
261 | counter->counter = counter->ops->counter_create( | |
262 | number_dimensions, dimensions_sizes, 0); | |
263 | if (!counter->counter) { | |
264 | goto create_error; | |
265 | } | |
266 | ||
267 | return counter; | |
268 | ||
269 | create_error: | |
270 | lttng_kvfree(counter); | |
271 | nomem: | |
272 | if (counter_transport) | |
273 | module_put(counter_transport->owner); | |
274 | notransport: | |
275 | return NULL; | |
276 | } | |
277 | ||
750b05f2 FD |
278 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
279 | { | |
280 | struct lttng_transport *transport = NULL; | |
281 | struct lttng_event_notifier_group *event_notifier_group; | |
282 | const char *transport_name = "relay-event-notifier"; | |
283 | size_t subbuf_size = 4096; //TODO | |
284 | size_t num_subbuf = 16; //TODO | |
285 | unsigned int switch_timer_interval = 0; | |
286 | unsigned int read_timer_interval = 0; | |
dffef45d | 287 | int i; |
750b05f2 FD |
288 | |
289 | mutex_lock(&sessions_mutex); | |
290 | ||
291 | transport = lttng_transport_find(transport_name); | |
292 | if (!transport) { | |
293 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
294 | transport_name); | |
295 | goto notransport; | |
296 | } | |
297 | if (!try_module_get(transport->owner)) { | |
298 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
299 | transport_name); | |
300 | goto notransport; | |
301 | } | |
302 | ||
303 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
304 | GFP_KERNEL); | |
305 | if (!event_notifier_group) | |
306 | goto nomem; | |
307 | ||
308 | /* | |
309 | * Initialize the ring buffer used to store event notifier | |
310 | * notifications. | |
311 | */ | |
312 | event_notifier_group->ops = &transport->ops; | |
4a399b76 | 313 | event_notifier_group->chan = transport->ops.priv->channel_create( |
750b05f2 FD |
314 | transport_name, event_notifier_group, NULL, |
315 | subbuf_size, num_subbuf, switch_timer_interval, | |
316 | read_timer_interval); | |
317 | if (!event_notifier_group->chan) | |
318 | goto create_error; | |
319 | ||
320 | event_notifier_group->transport = transport; | |
dffef45d FD |
321 | |
322 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
323 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
33af697f MD |
324 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) |
325 | INIT_HLIST_HEAD(&event_notifier_group->events_ht.table[i]); | |
dffef45d | 326 | |
750b05f2 FD |
327 | list_add(&event_notifier_group->node, &event_notifier_groups); |
328 | ||
329 | mutex_unlock(&sessions_mutex); | |
330 | ||
331 | return event_notifier_group; | |
332 | ||
333 | create_error: | |
334 | lttng_kvfree(event_notifier_group); | |
335 | nomem: | |
336 | if (transport) | |
337 | module_put(transport->owner); | |
338 | notransport: | |
339 | mutex_unlock(&sessions_mutex); | |
340 | return NULL; | |
341 | } | |
342 | ||
d83004aa JD |
343 | void metadata_cache_destroy(struct kref *kref) |
344 | { | |
345 | struct lttng_metadata_cache *cache = | |
346 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 347 | vfree(cache->data); |
d83004aa | 348 | kfree(cache); |
4e3c1b9b MD |
349 | } |
350 | ||
8cdc1a81 | 351 | void lttng_session_destroy(struct lttng_kernel_session *session) |
4e3c1b9b | 352 | { |
f7d06400 | 353 | struct lttng_kernel_channel_buffer_private *chan_priv, *tmpchan_priv; |
a67ba386 | 354 | struct lttng_kernel_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
d83004aa | 355 | struct lttng_metadata_stream *metadata_stream; |
44b1abdc | 356 | struct lttng_event_recorder_enabler *event_recorder_enabler, *tmp_event_recorder_enabler; |
dda6a249 | 357 | int ret; |
4e3c1b9b MD |
358 | |
359 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 360 | WRITE_ONCE(session->active, 0); |
f7d06400 | 361 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 362 | ret = lttng_syscalls_unregister_syscall_table(&chan_priv->parent.syscall_table); |
1ec65de1 MD |
363 | WARN_ON(ret); |
364 | } | |
8cdc1a81 | 365 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
f0bcc14c | 366 | ret = _lttng_event_unregister(&event_recorder_priv->pub->parent); |
dda6a249 MD |
367 | WARN_ON(ret); |
368 | } | |
abcca994 | 369 | synchronize_trace(); /* Wait for in-flight events to complete */ |
f7d06400 | 370 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
6053e75e | 371 | ret = lttng_syscalls_destroy_syscall_table(&chan_priv->parent.syscall_table); |
badfe9f5 MD |
372 | WARN_ON(ret); |
373 | } | |
44b1abdc | 374 | list_for_each_entry_safe(event_recorder_enabler, tmp_event_recorder_enabler, |
8cdc1a81 | 375 | &session->priv->enablers_head, node) |
44b1abdc | 376 | lttng_event_enabler_destroy(&event_recorder_enabler->parent); |
8cdc1a81 | 377 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, node) |
0648898e | 378 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
f7d06400 MD |
379 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
380 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
381 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 382 | } |
8cdc1a81 MD |
383 | mutex_lock(&session->priv->metadata_cache->lock); |
384 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 385 | _lttng_metadata_channel_hangup(metadata_stream); |
8cdc1a81 | 386 | mutex_unlock(&session->priv->metadata_cache->lock); |
8c0393c3 MD |
387 | lttng_id_tracker_fini(&session->pid_tracker); |
388 | lttng_id_tracker_fini(&session->vpid_tracker); | |
389 | lttng_id_tracker_fini(&session->uid_tracker); | |
390 | lttng_id_tracker_fini(&session->vuid_tracker); | |
391 | lttng_id_tracker_fini(&session->gid_tracker); | |
392 | lttng_id_tracker_fini(&session->vgid_tracker); | |
8cdc1a81 MD |
393 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
394 | list_del(&session->priv->list); | |
4e3c1b9b | 395 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 396 | lttng_kvfree(session->priv); |
48f5e0b5 | 397 | lttng_kvfree(session); |
4e3c1b9b MD |
398 | } |
399 | ||
dffef45d FD |
400 | void lttng_event_notifier_group_destroy( |
401 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 402 | { |
dffef45d | 403 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
a67ba386 | 404 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
405 | int ret; |
406 | ||
750b05f2 FD |
407 | if (!event_notifier_group) |
408 | return; | |
409 | ||
410 | mutex_lock(&sessions_mutex); | |
dffef45d | 411 | |
6053e75e | 412 | ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table); |
8a8ac9a8 FD |
413 | WARN_ON(ret); |
414 | ||
a67ba386 MD |
415 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
416 | &event_notifier_group->event_notifiers_head, node) { | |
f0bcc14c | 417 | ret = _lttng_event_unregister(&event_notifier_priv->pub->parent); |
dffef45d FD |
418 | WARN_ON(ret); |
419 | } | |
420 | ||
b01155ba FD |
421 | /* Wait for in-flight event notifier to complete */ |
422 | synchronize_trace(); | |
423 | ||
21f58fb7 FD |
424 | irq_work_sync(&event_notifier_group->wakeup_pending); |
425 | ||
6053e75e MD |
426 | ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table); |
427 | WARN_ON(ret); | |
8a8ac9a8 | 428 | |
dffef45d FD |
429 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
430 | &event_notifier_group->enablers_head, node) | |
44b1abdc | 431 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); |
dffef45d | 432 | |
a67ba386 MD |
433 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
434 | &event_notifier_group->event_notifiers_head, node) | |
0648898e | 435 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 436 | |
99f52fcc FD |
437 | if (event_notifier_group->error_counter) { |
438 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 439 | |
99f52fcc FD |
440 | error_counter->ops->counter_destroy(error_counter->counter); |
441 | module_put(error_counter->transport->owner); | |
442 | lttng_kvfree(error_counter); | |
443 | event_notifier_group->error_counter = NULL; | |
444 | } | |
445 | ||
4a399b76 | 446 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
447 | module_put(event_notifier_group->transport->owner); |
448 | list_del(&event_notifier_group->node); | |
dffef45d | 449 | |
750b05f2 FD |
450 | mutex_unlock(&sessions_mutex); |
451 | lttng_kvfree(event_notifier_group); | |
452 | } | |
453 | ||
8cdc1a81 | 454 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
455 | { |
456 | int ret; | |
457 | ||
458 | mutex_lock(&sessions_mutex); | |
459 | ret = lttng_statedump_start(session); | |
460 | mutex_unlock(&sessions_mutex); | |
461 | return ret; | |
462 | } | |
463 | ||
8cdc1a81 | 464 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
465 | { |
466 | int ret = 0; | |
f7d06400 | 467 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
468 | |
469 | mutex_lock(&sessions_mutex); | |
470 | if (session->active) { | |
471 | ret = -EBUSY; | |
472 | goto end; | |
473 | } | |
c099397a | 474 | |
3c997079 | 475 | /* Set transient enabler state to "enabled" */ |
8cdc1a81 | 476 | session->priv->tstate = 1; |
3c997079 | 477 | |
4ef81e4a | 478 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 479 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 480 | |
c099397a MD |
481 | /* |
482 | * Snapshot the number of events per channel to know the type of header | |
483 | * we need to use. | |
484 | */ | |
f7d06400 MD |
485 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
486 | if (chan_priv->header_type) | |
487 | continue; /* don't change it if session stop/restart */ | |
488 | if (chan_priv->free_event_id < 31) | |
489 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 490 | else |
f7d06400 | 491 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
492 | } |
493 | ||
64af2437 | 494 | /* Clear each stream's quiescent state. */ |
f7d06400 MD |
495 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
496 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
497 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 498 | } |
64af2437 | 499 | |
a8f2d0c7 | 500 | WRITE_ONCE(session->active, 1); |
8cdc1a81 | 501 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 502 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 503 | if (ret) { |
a8f2d0c7 | 504 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
505 | goto end; |
506 | } | |
507 | ret = lttng_statedump_start(session); | |
360f38ea | 508 | if (ret) |
a8f2d0c7 | 509 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
510 | end: |
511 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 512 | return ret; |
c0e31d2e MD |
513 | } |
514 | ||
8cdc1a81 | 515 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
516 | { |
517 | int ret = 0; | |
f7d06400 | 518 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
519 | |
520 | mutex_lock(&sessions_mutex); | |
521 | if (!session->active) { | |
522 | ret = -EBUSY; | |
523 | goto end; | |
524 | } | |
a8f2d0c7 | 525 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
526 | |
527 | /* Set transient enabler state to "disabled" */ | |
8cdc1a81 | 528 | session->priv->tstate = 0; |
b2bc0bc8 | 529 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
530 | |
531 | /* Set each stream's quiescent state. */ | |
f7d06400 MD |
532 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
533 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
534 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 535 | } |
c0e31d2e MD |
536 | end: |
537 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 538 | return ret; |
c0e31d2e MD |
539 | } |
540 | ||
8cdc1a81 | 541 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
542 | { |
543 | int ret = 0; | |
f7d06400 | 544 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 545 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
8cdc1a81 | 546 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
547 | struct lttng_metadata_stream *stream; |
548 | ||
549 | mutex_lock(&sessions_mutex); | |
550 | if (!session->active) { | |
551 | ret = -EBUSY; | |
552 | goto end; | |
553 | } | |
554 | ||
555 | mutex_lock(&cache->lock); | |
556 | memset(cache->data, 0, cache->cache_alloc); | |
557 | cache->metadata_written = 0; | |
558 | cache->version++; | |
8cdc1a81 | 559 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
560 | stream->metadata_out = 0; |
561 | stream->metadata_in = 0; | |
562 | } | |
563 | mutex_unlock(&cache->lock); | |
564 | ||
8cdc1a81 | 565 | session->priv->metadata_dumped = 0; |
f7d06400 MD |
566 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
567 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
568 | } |
569 | ||
8cdc1a81 | 570 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 571 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
572 | } |
573 | ||
574 | ret = _lttng_session_metadata_statedump(session); | |
575 | ||
576 | end: | |
577 | mutex_unlock(&sessions_mutex); | |
578 | return ret; | |
579 | } | |
580 | ||
6b757027 MD |
581 | static |
582 | bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel) | |
583 | { | |
584 | struct lttng_kernel_channel_buffer *chan_buf; | |
585 | ||
586 | if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER) | |
587 | return false; | |
588 | chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent); | |
589 | if (chan_buf->priv->channel_type == METADATA_CHANNEL) | |
590 | return true; | |
591 | return false; | |
592 | } | |
593 | ||
594 | int lttng_channel_enable(struct lttng_kernel_channel_common *channel) | |
e64957da | 595 | { |
3c997079 | 596 | int ret = 0; |
e64957da | 597 | |
3c997079 | 598 | mutex_lock(&sessions_mutex); |
6b757027 | 599 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
600 | ret = -EPERM; |
601 | goto end; | |
602 | } | |
6b757027 | 603 | if (channel->enabled) { |
3c997079 MD |
604 | ret = -EEXIST; |
605 | goto end; | |
606 | } | |
607 | /* Set transient enabler state to "enabled" */ | |
6b757027 MD |
608 | channel->priv->tstate = 1; |
609 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 | 610 | /* Set atomically the state to "enabled" */ |
6b757027 | 611 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
612 | end: |
613 | mutex_unlock(&sessions_mutex); | |
614 | return ret; | |
e64957da MD |
615 | } |
616 | ||
6b757027 | 617 | int lttng_channel_disable(struct lttng_kernel_channel_common *channel) |
e64957da | 618 | { |
3c997079 | 619 | int ret = 0; |
e64957da | 620 | |
3c997079 | 621 | mutex_lock(&sessions_mutex); |
6b757027 | 622 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
623 | ret = -EPERM; |
624 | goto end; | |
625 | } | |
6b757027 | 626 | if (!channel->enabled) { |
3c997079 MD |
627 | ret = -EEXIST; |
628 | goto end; | |
629 | } | |
630 | /* Set atomically the state to "disabled" */ | |
6b757027 | 631 | WRITE_ONCE(channel->enabled, 0); |
3c997079 | 632 | /* Set transient enabler state to "enabled" */ |
6b757027 MD |
633 | channel->priv->tstate = 0; |
634 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 MD |
635 | end: |
636 | mutex_unlock(&sessions_mutex); | |
637 | return ret; | |
e64957da MD |
638 | } |
639 | ||
9d993668 | 640 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 641 | { |
3c997079 | 642 | int ret = 0; |
e64957da | 643 | |
3c997079 | 644 | mutex_lock(&sessions_mutex); |
9d993668 MD |
645 | switch (event->type) { |
646 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
647 | { | |
648 | struct lttng_kernel_event_recorder *event_recorder = | |
649 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
650 | ||
f7d06400 | 651 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
652 | ret = -EPERM; |
653 | goto end; | |
654 | } | |
a0493bef | 655 | break; |
9d993668 MD |
656 | } |
657 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
658 | switch (event->priv->instrumentation) { | |
659 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
660 | ret = -EINVAL; | |
661 | goto end; | |
662 | default: | |
663 | break; | |
664 | } | |
a0493bef MD |
665 | break; |
666 | default: | |
9d993668 | 667 | break; |
a0493bef | 668 | } |
e64957da | 669 | |
9d993668 | 670 | if (event->enabled) { |
3c997079 MD |
671 | ret = -EEXIST; |
672 | goto end; | |
673 | } | |
a67ba386 | 674 | switch (event->priv->instrumentation) { |
c190d76e MJ |
675 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
676 | lttng_fallthrough; | |
606828e4 | 677 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
678 | ret = -EINVAL; |
679 | break; | |
b4a75708 | 680 | |
c190d76e MJ |
681 | case LTTNG_KERNEL_ABI_KPROBE: |
682 | lttng_fallthrough; | |
606828e4 | 683 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 684 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 685 | break; |
b4a75708 | 686 | |
606828e4 | 687 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 688 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 689 | break; |
b4a75708 | 690 | |
c190d76e MJ |
691 | case LTTNG_KERNEL_ABI_FUNCTION: |
692 | lttng_fallthrough; | |
693 | case LTTNG_KERNEL_ABI_NOOP: | |
694 | lttng_fallthrough; | |
a0493bef MD |
695 | default: |
696 | WARN_ON_ONCE(1); | |
697 | ret = -EINVAL; | |
698 | } | |
3c997079 MD |
699 | end: |
700 | mutex_unlock(&sessions_mutex); | |
701 | return ret; | |
e64957da MD |
702 | } |
703 | ||
9d993668 | 704 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
705 | { |
706 | int ret = 0; | |
707 | ||
708 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
709 | switch (event->type) { |
710 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
711 | { | |
712 | struct lttng_kernel_event_recorder *event_recorder = | |
713 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
714 | ||
f7d06400 | 715 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
716 | ret = -EPERM; |
717 | goto end; | |
718 | } | |
b01155ba | 719 | break; |
9d993668 MD |
720 | } |
721 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
722 | switch (event->priv->instrumentation) { | |
723 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
724 | ret = -EINVAL; | |
725 | goto end; | |
726 | default: | |
727 | break; | |
728 | } | |
2b16f0c9 | 729 | break; |
dffef45d | 730 | default: |
9d993668 | 731 | break; |
dffef45d | 732 | } |
dffef45d | 733 | |
a67ba386 | 734 | if (!event->enabled) { |
dffef45d FD |
735 | ret = -EEXIST; |
736 | goto end; | |
737 | } | |
a67ba386 | 738 | switch (event->priv->instrumentation) { |
c190d76e MJ |
739 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
740 | lttng_fallthrough; | |
606828e4 | 741 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
742 | ret = -EINVAL; |
743 | break; | |
b4a75708 | 744 | |
c190d76e MJ |
745 | case LTTNG_KERNEL_ABI_KPROBE: |
746 | lttng_fallthrough; | |
606828e4 | 747 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 748 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 749 | break; |
b4a75708 | 750 | |
9d993668 MD |
751 | case LTTNG_KERNEL_ABI_KRETPROBE: |
752 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
753 | break; | |
754 | ||
c190d76e MJ |
755 | case LTTNG_KERNEL_ABI_FUNCTION: |
756 | lttng_fallthrough; | |
757 | case LTTNG_KERNEL_ABI_NOOP: | |
758 | lttng_fallthrough; | |
dffef45d FD |
759 | default: |
760 | WARN_ON_ONCE(1); | |
761 | ret = -EINVAL; | |
762 | } | |
763 | end: | |
764 | mutex_unlock(&sessions_mutex); | |
765 | return ret; | |
766 | } | |
767 | ||
4e252d1e | 768 | struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
769 | const char *transport_name, |
770 | void *buf_addr, | |
4e3c1b9b MD |
771 | size_t subbuf_size, size_t num_subbuf, |
772 | unsigned int switch_timer_interval, | |
d83004aa JD |
773 | unsigned int read_timer_interval, |
774 | enum channel_type channel_type) | |
4e3c1b9b | 775 | { |
f7d06400 MD |
776 | struct lttng_kernel_channel_buffer *chan; |
777 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 778 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
779 | |
780 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 781 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 782 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 783 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 784 | if (!transport) { |
5a15f70c | 785 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 786 | transport_name); |
c0e31d2e | 787 | goto notransport; |
f3d01b96 | 788 | } |
a33c9927 | 789 | if (!try_module_get(transport->owner)) { |
5a15f70c | 790 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
791 | goto notransport; |
792 | } | |
f7d06400 | 793 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 794 | if (!chan) |
c0e31d2e | 795 | goto nomem; |
f7d06400 MD |
796 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
797 | if (!chan_priv) | |
798 | goto nomem_priv; | |
799 | chan->priv = chan_priv; | |
800 | chan_priv->pub = chan; | |
801 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
802 | chan->parent.session = session; | |
803 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 804 | chan->ops = &transport->ops; |
125b4df4 MD |
805 | /* |
806 | * Note: the channel creation op already writes into the packet | |
807 | * headers. Therefore the "chan" information used as input | |
808 | * should be already accessible. | |
809 | */ | |
f7d06400 | 810 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
811 | chan, buf_addr, subbuf_size, num_subbuf, |
812 | switch_timer_interval, read_timer_interval); | |
f7d06400 | 813 | if (!chan->priv->rb_chan) |
f3d01b96 | 814 | goto create_error; |
f7d06400 MD |
815 | chan->priv->parent.tstate = 1; |
816 | chan->parent.enabled = 1; | |
817 | chan->priv->transport = transport; | |
818 | chan->priv->channel_type = channel_type; | |
819 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
820 | mutex_unlock(&sessions_mutex); |
821 | return chan; | |
822 | ||
f3d01b96 | 823 | create_error: |
f7d06400 MD |
824 | kfree(chan_priv); |
825 | nomem_priv: | |
f3d01b96 | 826 | kfree(chan); |
c0e31d2e | 827 | nomem: |
a33c9927 MD |
828 | if (transport) |
829 | module_put(transport->owner); | |
c0e31d2e | 830 | notransport: |
e5382b6d | 831 | active: |
4e3c1b9b MD |
832 | mutex_unlock(&sessions_mutex); |
833 | return NULL; | |
834 | } | |
835 | ||
836 | /* | |
d83004aa JD |
837 | * Only used internally at session destruction for per-cpu channels, and |
838 | * when metadata channel is released. | |
839 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 840 | */ |
aa7c23a9 | 841 | static |
f7d06400 | 842 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 843 | { |
f7d06400 MD |
844 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
845 | module_put(chan->priv->transport->owner); | |
846 | list_del(&chan->priv->node); | |
847 | lttng_kernel_destroy_context(chan->priv->ctx); | |
848 | kfree(chan->priv); | |
4e3c1b9b MD |
849 | kfree(chan); |
850 | } | |
851 | ||
f7d06400 | 852 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 853 | { |
f7d06400 | 854 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
855 | |
856 | /* Protect the metadata cache with the sessions_mutex. */ | |
857 | mutex_lock(&sessions_mutex); | |
858 | _lttng_channel_destroy(chan); | |
859 | mutex_unlock(&sessions_mutex); | |
860 | } | |
861 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
862 | ||
863 | static | |
864 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
865 | { | |
866 | stream->finalized = 1; | |
867 | wake_up_interruptible(&stream->read_wait); | |
868 | } | |
869 | ||
a101fa10 | 870 | |
e5382b6d MD |
871 | /* |
872 | * Supports event creation while tracing session is active. | |
3c997079 | 873 | * Needs to be called with sessions mutex held. |
e5382b6d | 874 | */ |
1ae083ba | 875 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler, |
def1e304 | 876 | const struct lttng_kernel_event_desc *event_desc) |
4e3c1b9b | 877 | { |
0def9170 | 878 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent); |
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; |
a67ba386 MD |
882 | struct lttng_kernel_event_recorder *event_recorder; |
883 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
19bef247 | 884 | struct lttng_kernel_event_common_private *event_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 | |
0def9170 | 919 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 MD |
920 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
921 | event_recorder_priv = container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
922 | ||
923 | WARN_ON_ONCE(!event_priv->desc); | |
924 | if (!strncmp(event_priv->desc->event_name, event_name, | |
606828e4 | 925 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 926 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
927 | ret = -EEXIST; |
928 | goto exist; | |
abc0446a MD |
929 | } |
930 | } | |
3c997079 | 931 | |
a67ba386 MD |
932 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
933 | if (!event_recorder) { | |
4cf0bf51 | 934 | ret = -ENOMEM; |
4e3c1b9b | 935 | goto cache_error; |
abc0446a | 936 | } |
a67ba386 MD |
937 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
938 | if (!event_recorder_priv) { | |
939 | ret = -ENOMEM; | |
940 | goto cache_private_error; | |
941 | } | |
942 | event_recorder_priv->pub = event_recorder; | |
943 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
944 | event_recorder->priv = event_recorder_priv; | |
945 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
946 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
947 | ||
8a445457 | 948 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 949 | event_recorder->chan = chan; |
f7d06400 | 950 | event_recorder->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
951 | event_recorder->priv->parent.instrumentation = itype; |
952 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
953 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
954 | |
955 | switch (itype) { | |
606828e4 | 956 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 957 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
958 | event_recorder->parent.enabled = 0; |
959 | event_recorder->priv->parent.registered = 0; | |
960 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
961 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 962 | ret = -ENOENT; |
d3dbe23c | 963 | goto register_error; |
abc0446a | 964 | } |
3c997079 MD |
965 | /* Populate lttng_event structure before event registration. */ |
966 | smp_wmb(); | |
baf20995 | 967 | break; |
b4a75708 | 968 | |
606828e4 | 969 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
970 | /* |
971 | * Needs to be explicitly enabled after creation, since | |
972 | * we may want to apply filters. | |
973 | */ | |
a67ba386 MD |
974 | event_recorder->parent.enabled = 0; |
975 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
976 | /* |
977 | * Populate lttng_event structure before event | |
978 | * registration. | |
979 | */ | |
980 | smp_wmb(); | |
8bf17deb | 981 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
982 | event_param->u.kprobe.symbol_name, |
983 | event_param->u.kprobe.offset, | |
984 | event_param->u.kprobe.addr, | |
6a35e5bd | 985 | &event_recorder->parent); |
abc0446a | 986 | if (ret) { |
4cf0bf51 | 987 | ret = -EINVAL; |
d6d808f3 | 988 | goto register_error; |
abc0446a | 989 | } |
a67ba386 | 990 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 991 | WARN_ON_ONCE(!ret); |
d6d808f3 | 992 | break; |
b4a75708 | 993 | |
606828e4 | 994 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 995 | { |
a67ba386 MD |
996 | struct lttng_kernel_event_recorder *event_recorder_return; |
997 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
998 | |
999 | /* kretprobe defines 2 events */ | |
a0493bef MD |
1000 | /* |
1001 | * Needs to be explicitly enabled after creation, since | |
1002 | * we may want to apply filters. | |
1003 | */ | |
a67ba386 MD |
1004 | event_recorder->parent.enabled = 0; |
1005 | event_recorder->priv->parent.registered = 1; | |
1006 | ||
1007 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
1008 | if (!event_recorder_return) { | |
1009 | ret = -ENOMEM; | |
1010 | goto register_error; | |
1011 | } | |
1012 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
1013 | if (!event_recorder_return_priv) { | |
1014 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1015 | ret = -ENOMEM; |
7371f44c | 1016 | goto register_error; |
abc0446a | 1017 | } |
a67ba386 MD |
1018 | event_recorder_return_priv->pub = event_recorder_return; |
1019 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
1020 | event_recorder_return->priv = event_recorder_return_priv; | |
1021 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
1022 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
1023 | ||
8a445457 | 1024 | event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 1025 | event_recorder_return->chan = chan; |
f7d06400 | 1026 | event_recorder_return->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
1027 | event_recorder_return->priv->parent.instrumentation = itype; |
1028 | event_recorder_return->parent.enabled = 0; | |
1029 | event_recorder_return->priv->parent.registered = 1; | |
1030 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
1031 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 1032 | /* |
a90917c3 | 1033 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1034 | */ |
1035 | smp_wmb(); | |
3c997079 | 1036 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1037 | event_param->u.kretprobe.symbol_name, |
1038 | event_param->u.kretprobe.offset, | |
1039 | event_param->u.kretprobe.addr, | |
eb6b47db | 1040 | &event_recorder->parent, &event_recorder_return->parent); |
7371f44c | 1041 | if (ret) { |
a67ba386 MD |
1042 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1043 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1044 | ret = -EINVAL; |
7371f44c MD |
1045 | goto register_error; |
1046 | } | |
1047 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1048 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1049 | WARN_ON_ONCE(!ret); |
a67ba386 | 1050 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1051 | WARN_ON_ONCE(!ret); |
f7d06400 | 1052 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, |
a67ba386 | 1053 | event_recorder_return); |
abc0446a | 1054 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1055 | if (ret) { |
a67ba386 MD |
1056 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1057 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
1058 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1059 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1060 | goto statedump_error; |
1061 | } | |
f7d06400 | 1062 | list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events); |
7371f44c MD |
1063 | break; |
1064 | } | |
b4a75708 | 1065 | |
606828e4 | 1066 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1067 | /* |
1068 | * Needs to be explicitly enabled after creation, since | |
1069 | * we may want to apply filters. | |
1070 | */ | |
a67ba386 MD |
1071 | event_recorder->parent.enabled = 0; |
1072 | event_recorder->priv->parent.registered = 0; | |
1073 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1074 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1075 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1076 | ret = -EINVAL; |
1077 | goto register_error; | |
606828e4 | 1078 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1079 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1080 | break; |
606828e4 | 1081 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1082 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1083 | break; |
1084 | } | |
1085 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1086 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1087 | ret = -EINVAL; |
1088 | goto register_error; | |
606828e4 | 1089 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1090 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1091 | break; |
606828e4 | 1092 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1093 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1094 | break; |
1095 | } | |
a67ba386 | 1096 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1097 | ret = -EINVAL; |
259b6cb3 | 1098 | goto register_error; |
abc0446a | 1099 | } |
1ec65de1 | 1100 | break; |
b4a75708 | 1101 | |
606828e4 | 1102 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1103 | /* |
1104 | * Needs to be explicitly enabled after creation, since | |
1105 | * we may want to apply filters. | |
1106 | */ | |
a67ba386 MD |
1107 | event_recorder->parent.enabled = 0; |
1108 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1109 | |
a344f64b FD |
1110 | /* |
1111 | * Populate lttng_event structure before event | |
1112 | * registration. | |
1113 | */ | |
1114 | smp_wmb(); | |
149b9a9d | 1115 | |
83b802dc | 1116 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1117 | event_param->u.uprobe.fd, |
17806c46 | 1118 | &event_recorder->parent); |
149b9a9d YB |
1119 | if (ret) |
1120 | goto register_error; | |
a67ba386 | 1121 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1122 | WARN_ON_ONCE(!ret); |
1123 | break; | |
b4a75708 | 1124 | |
c190d76e MJ |
1125 | case LTTNG_KERNEL_ABI_FUNCTION: |
1126 | lttng_fallthrough; | |
1127 | case LTTNG_KERNEL_ABI_NOOP: | |
1128 | lttng_fallthrough; | |
baf20995 MD |
1129 | default: |
1130 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1131 | ret = -EINVAL; |
df07930b | 1132 | goto register_error; |
baf20995 | 1133 | } |
f7d06400 | 1134 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder); |
abc0446a MD |
1135 | WARN_ON_ONCE(ret > 0); |
1136 | if (ret) { | |
c099397a | 1137 | goto statedump_error; |
abc0446a | 1138 | } |
19bef247 | 1139 | hlist_add_head(&event_recorder->priv->parent.hlist_node, head); |
f7d06400 | 1140 | list_add(&event_recorder->priv->node, &chan->parent.session->priv->events); |
a67ba386 | 1141 | return event_recorder; |
4e3c1b9b | 1142 | |
c099397a | 1143 | statedump_error: |
259b6cb3 | 1144 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1145 | register_error: |
a67ba386 MD |
1146 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1147 | cache_private_error: | |
1148 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1149 | cache_error: |
1150 | exist: | |
3c997079 | 1151 | type_error: |
e5382b6d | 1152 | full: |
4cf0bf51 | 1153 | return ERR_PTR(ret); |
4e3c1b9b MD |
1154 | } |
1155 | ||
1bbb5b2d MD |
1156 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create(struct lttng_event_notifier_enabler *event_enabler, |
1157 | const struct lttng_kernel_event_desc *event_desc) | |
dffef45d | 1158 | { |
0def9170 | 1159 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent); |
1bbb5b2d MD |
1160 | struct lttng_event_notifier_group *event_notifier_group = event_enabler->group; |
1161 | struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param; | |
1162 | uint64_t token = event_enabler->parent.user_token; | |
1163 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
a67ba386 MD |
1164 | struct lttng_kernel_event_notifier *event_notifier; |
1165 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
19bef247 | 1166 | struct lttng_kernel_event_common_private *event_priv; |
ab04d7b1 | 1167 | struct lttng_counter *error_counter; |
dffef45d FD |
1168 | const char *event_name; |
1169 | struct hlist_head *head; | |
1170 | int ret; | |
1171 | ||
1172 | switch (itype) { | |
606828e4 | 1173 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1174 | event_name = event_desc->event_name; |
b01155ba | 1175 | break; |
b4a75708 | 1176 | |
c190d76e MJ |
1177 | case LTTNG_KERNEL_ABI_KPROBE: |
1178 | lttng_fallthrough; | |
1179 | case LTTNG_KERNEL_ABI_UPROBE: | |
1180 | lttng_fallthrough; | |
606828e4 | 1181 | case LTTNG_KERNEL_ABI_SYSCALL: |
1bbb5b2d | 1182 | event_name = event_param->name; |
2b16f0c9 | 1183 | break; |
b4a75708 | 1184 | |
c190d76e MJ |
1185 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1186 | lttng_fallthrough; | |
1187 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1188 | lttng_fallthrough; | |
1189 | case LTTNG_KERNEL_ABI_NOOP: | |
1190 | lttng_fallthrough; | |
dffef45d FD |
1191 | default: |
1192 | WARN_ON_ONCE(1); | |
1193 | ret = -EINVAL; | |
1194 | goto type_error; | |
1195 | } | |
1196 | ||
0def9170 | 1197 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 MD |
1198 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
1199 | event_notifier_priv = container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
1200 | ||
1201 | WARN_ON_ONCE(!event_priv->desc); | |
1202 | if (!strncmp(event_priv->desc->event_name, event_name, | |
606828e4 | 1203 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 1204 | && event_notifier_group == event_notifier_priv->group |
19bef247 | 1205 | && token == event_priv->user_token) { |
dffef45d FD |
1206 | ret = -EEXIST; |
1207 | goto exist; | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1212 | if (!event_notifier) { | |
1213 | ret = -ENOMEM; | |
1214 | goto cache_error; | |
1215 | } | |
a67ba386 MD |
1216 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1217 | if (!event_notifier_priv) { | |
1218 | ret = -ENOMEM; | |
1219 | goto cache_private_error; | |
1220 | } | |
1221 | event_notifier_priv->pub = event_notifier; | |
1222 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1223 | event_notifier->priv = event_notifier_priv; | |
1224 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1225 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1226 | ||
1227 | event_notifier->priv->group = event_notifier_group; | |
1bbb5b2d MD |
1228 | event_notifier->priv->parent.user_token = event_enabler->parent.user_token; |
1229 | event_notifier->priv->error_counter_index = event_enabler->error_counter_index; | |
a67ba386 MD |
1230 | event_notifier->priv->num_captures = 0; |
1231 | event_notifier->priv->parent.instrumentation = itype; | |
1232 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1233 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1234 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1235 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
8a445457 | 1236 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; |
dffef45d FD |
1237 | |
1238 | switch (itype) { | |
606828e4 | 1239 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1240 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1241 | event_notifier->parent.enabled = 0; |
1242 | event_notifier->priv->parent.registered = 0; | |
1243 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1244 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1245 | ret = -ENOENT; |
1246 | goto register_error; | |
1247 | } | |
1248 | /* Populate lttng_event_notifier structure before event registration. */ | |
1249 | smp_wmb(); | |
1250 | break; | |
b4a75708 | 1251 | |
606828e4 | 1252 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1253 | /* |
1254 | * Needs to be explicitly enabled after creation, since | |
1255 | * we may want to apply filters. | |
1256 | */ | |
a67ba386 MD |
1257 | event_notifier->parent.enabled = 0; |
1258 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1259 | /* |
1260 | * Populate lttng_event_notifier structure before event | |
1261 | * registration. | |
1262 | */ | |
1263 | smp_wmb(); | |
1bbb5b2d MD |
1264 | ret = lttng_kprobes_register_event(event_param->u.kprobe.symbol_name, |
1265 | event_param->u.kprobe.symbol_name, | |
1266 | event_param->u.kprobe.offset, | |
1267 | event_param->u.kprobe.addr, | |
6a35e5bd | 1268 | &event_notifier->parent); |
2b16f0c9 FD |
1269 | if (ret) { |
1270 | ret = -EINVAL; | |
1271 | goto register_error; | |
1272 | } | |
a67ba386 | 1273 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1274 | WARN_ON_ONCE(!ret); |
1275 | break; | |
b4a75708 | 1276 | |
606828e4 | 1277 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1278 | /* |
1279 | * Needs to be explicitly enabled after creation, since | |
1280 | * we may want to apply filters. | |
1281 | */ | |
a67ba386 MD |
1282 | event_notifier->parent.enabled = 0; |
1283 | event_notifier->priv->parent.registered = 0; | |
1284 | event_notifier->priv->parent.desc = event_desc; | |
1bbb5b2d | 1285 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1286 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1287 | ret = -EINVAL; |
1288 | goto register_error; | |
606828e4 | 1289 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1290 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1291 | break; |
606828e4 | 1292 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1293 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1294 | break; |
1295 | } | |
1bbb5b2d | 1296 | switch (event_param->u.syscall.abi) { |
606828e4 | 1297 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1298 | ret = -EINVAL; |
1299 | goto register_error; | |
606828e4 | 1300 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1301 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1302 | break; |
606828e4 | 1303 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1304 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1305 | break; |
1306 | } | |
1307 | ||
a67ba386 | 1308 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1309 | ret = -EINVAL; |
1310 | goto register_error; | |
1311 | } | |
1312 | break; | |
b4a75708 | 1313 | |
606828e4 | 1314 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1315 | /* |
1316 | * Needs to be explicitly enabled after creation, since | |
1317 | * we may want to apply filters. | |
1318 | */ | |
a67ba386 MD |
1319 | event_notifier->parent.enabled = 0; |
1320 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1321 | |
1322 | /* | |
1323 | * Populate lttng_event_notifier structure before | |
1324 | * event_notifier registration. | |
1325 | */ | |
1326 | smp_wmb(); | |
1327 | ||
1bbb5b2d MD |
1328 | ret = lttng_uprobes_register_event(event_param->name, |
1329 | event_param->u.uprobe.fd, | |
17806c46 | 1330 | &event_notifier->parent); |
9de67196 FD |
1331 | if (ret) |
1332 | goto register_error; | |
a67ba386 | 1333 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1334 | WARN_ON_ONCE(!ret); |
1335 | break; | |
b4a75708 | 1336 | |
c190d76e MJ |
1337 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1338 | lttng_fallthrough; | |
1339 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1340 | lttng_fallthrough; | |
1341 | case LTTNG_KERNEL_ABI_NOOP: | |
1342 | lttng_fallthrough; | |
dffef45d FD |
1343 | default: |
1344 | WARN_ON_ONCE(1); | |
1345 | ret = -EINVAL; | |
1346 | goto register_error; | |
1347 | } | |
1348 | ||
a67ba386 | 1349 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
19bef247 | 1350 | hlist_add_head(&event_notifier->priv->parent.hlist_node, head); |
99f52fcc FD |
1351 | |
1352 | /* | |
1353 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1354 | * bucket is currently in use. We trust it. The session lock |
1355 | * synchronizes against concurrent creation of the error | |
1356 | * counter. | |
99f52fcc | 1357 | */ |
ab04d7b1 MD |
1358 | error_counter = event_notifier_group->error_counter; |
1359 | if (error_counter) { | |
99f52fcc FD |
1360 | size_t dimension_index[1]; |
1361 | ||
1362 | /* | |
1363 | * Check that the index is within the boundary of the counter. | |
1364 | */ | |
a67ba386 | 1365 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1366 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1367 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1368 | ret = -EINVAL; |
1369 | goto register_error; | |
1370 | } | |
1371 | ||
a67ba386 | 1372 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1373 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1374 | if (ret) { |
1375 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1376 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1377 | goto register_error; |
1378 | } | |
1379 | } | |
1380 | ||
dffef45d FD |
1381 | return event_notifier; |
1382 | ||
1383 | register_error: | |
a67ba386 MD |
1384 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1385 | cache_private_error: | |
dffef45d FD |
1386 | kmem_cache_free(event_notifier_cache, event_notifier); |
1387 | cache_error: | |
1388 | exist: | |
1389 | type_error: | |
1390 | return ERR_PTR(ret); | |
1391 | } | |
1392 | ||
99f52fcc FD |
1393 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1394 | const size_t *dim_indexes, int32_t cpu, | |
1395 | int64_t *val, bool *overflow, bool *underflow) | |
1396 | { | |
1397 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1398 | cpu, val, overflow, underflow); | |
1399 | } | |
1400 | ||
1401 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1402 | const size_t *dim_indexes, int64_t *val, | |
1403 | bool *overflow, bool *underflow) | |
1404 | { | |
1405 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1406 | val, overflow, underflow); | |
1407 | } | |
1408 | ||
1409 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1410 | const size_t *dim_indexes) | |
1411 | { | |
1412 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1413 | } | |
1414 | ||
1ae083ba | 1415 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler, |
def1e304 | 1416 | const struct lttng_kernel_event_desc *event_desc) |
3c997079 | 1417 | { |
a67ba386 | 1418 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1419 | |
1420 | mutex_lock(&sessions_mutex); | |
def1e304 | 1421 | event = _lttng_kernel_event_recorder_create(event_enabler, event_desc); |
3c997079 MD |
1422 | mutex_unlock(&sessions_mutex); |
1423 | return event; | |
1424 | } | |
1425 | ||
1bbb5b2d MD |
1426 | struct lttng_kernel_event_notifier *lttng_event_notifier_create(struct lttng_event_notifier_enabler *event_enabler, |
1427 | const struct lttng_kernel_event_desc *event_desc) | |
dffef45d | 1428 | { |
a67ba386 | 1429 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1430 | |
1431 | mutex_lock(&sessions_mutex); | |
1bbb5b2d | 1432 | event_notifier = _lttng_event_notifier_create(event_enabler, event_desc); |
dffef45d FD |
1433 | mutex_unlock(&sessions_mutex); |
1434 | return event_notifier; | |
1435 | } | |
1436 | ||
3c997079 MD |
1437 | /* Only used for tracepoints for now. */ |
1438 | static | |
0c851fa0 | 1439 | void register_event(struct lttng_kernel_event_common *event) |
3c997079 | 1440 | { |
437d5aa5 | 1441 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1442 | int ret = -EINVAL; |
3c997079 | 1443 | |
0c851fa0 | 1444 | if (event->priv->registered) |
3c997079 | 1445 | return; |
4ecb5ad5 | 1446 | |
0c851fa0 MD |
1447 | desc = event->priv->desc; |
1448 | switch (event->priv->instrumentation) { | |
606828e4 | 1449 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1450 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1451 | desc->tp_class->probe_callback, |
0c851fa0 | 1452 | event); |
4ecb5ad5 | 1453 | break; |
b4a75708 | 1454 | |
606828e4 | 1455 | case LTTNG_KERNEL_ABI_SYSCALL: |
0c851fa0 | 1456 | ret = lttng_syscall_filter_enable_event(event); |
4ecb5ad5 | 1457 | break; |
b4a75708 | 1458 | |
c190d76e MJ |
1459 | case LTTNG_KERNEL_ABI_KPROBE: |
1460 | lttng_fallthrough; | |
1461 | case LTTNG_KERNEL_ABI_UPROBE: | |
4ecb5ad5 | 1462 | ret = 0; |
f0bcc14c | 1463 | break; |
0c851fa0 MD |
1464 | |
1465 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1466 | switch (event->type) { | |
1467 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1468 | ret = 0; | |
1469 | break; | |
1470 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1471 | WARN_ON_ONCE(1); | |
1472 | break; | |
1473 | } | |
4ecb5ad5 | 1474 | break; |
b4a75708 | 1475 | |
c190d76e MJ |
1476 | case LTTNG_KERNEL_ABI_FUNCTION: |
1477 | lttng_fallthrough; | |
1478 | case LTTNG_KERNEL_ABI_NOOP: | |
1479 | lttng_fallthrough; | |
4ecb5ad5 MD |
1480 | default: |
1481 | WARN_ON_ONCE(1); | |
1482 | } | |
3c997079 | 1483 | if (!ret) |
0c851fa0 | 1484 | event->priv->registered = 1; |
3c997079 MD |
1485 | } |
1486 | ||
f0bcc14c | 1487 | int _lttng_event_unregister(struct lttng_kernel_event_common *event) |
4e3c1b9b | 1488 | { |
f0bcc14c | 1489 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
437d5aa5 | 1490 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1491 | int ret = -EINVAL; |
1492 | ||
a67ba386 | 1493 | if (!event_priv->registered) |
3c997079 MD |
1494 | return 0; |
1495 | ||
a67ba386 MD |
1496 | desc = event_priv->desc; |
1497 | switch (event_priv->instrumentation) { | |
606828e4 | 1498 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1499 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1500 | event_priv->desc->tp_class->probe_callback, |
f0bcc14c | 1501 | event); |
baf20995 | 1502 | break; |
b4a75708 | 1503 | |
606828e4 | 1504 | case LTTNG_KERNEL_ABI_KPROBE: |
f0bcc14c | 1505 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1506 | ret = 0; |
1507 | break; | |
b4a75708 | 1508 | |
606828e4 | 1509 | case LTTNG_KERNEL_ABI_KRETPROBE: |
f0bcc14c MD |
1510 | switch (event->type) { |
1511 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1512 | lttng_kretprobes_unregister(event); | |
1513 | ret = 0; | |
1514 | break; | |
1515 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1516 | WARN_ON_ONCE(1); | |
1517 | break; | |
1518 | } | |
7371f44c | 1519 | break; |
b4a75708 | 1520 | |
606828e4 | 1521 | case LTTNG_KERNEL_ABI_SYSCALL: |
f0bcc14c | 1522 | ret = lttng_syscall_filter_disable_event(event); |
4ecb5ad5 | 1523 | break; |
b4a75708 | 1524 | |
606828e4 | 1525 | case LTTNG_KERNEL_ABI_NOOP: |
f0bcc14c MD |
1526 | switch (event->type) { |
1527 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1528 | ret = 0; | |
1529 | break; | |
1530 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1531 | WARN_ON_ONCE(1); | |
1532 | break; | |
1533 | } | |
259b6cb3 | 1534 | break; |
b4a75708 | 1535 | |
606828e4 | 1536 | case LTTNG_KERNEL_ABI_UPROBE: |
f0bcc14c | 1537 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1538 | ret = 0; |
1539 | break; | |
b4a75708 | 1540 | |
c190d76e MJ |
1541 | case LTTNG_KERNEL_ABI_FUNCTION: |
1542 | lttng_fallthrough; | |
baf20995 MD |
1543 | default: |
1544 | WARN_ON_ONCE(1); | |
1545 | } | |
3c997079 | 1546 | if (!ret) |
a67ba386 | 1547 | event_priv->registered = 0; |
dda6a249 MD |
1548 | return ret; |
1549 | } | |
1550 | ||
1551 | /* | |
1552 | * Only used internally at session destruction. | |
1553 | */ | |
be066e6c | 1554 | static |
0648898e | 1555 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1556 | { |
0648898e | 1557 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1558 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1559 | ||
0648898e MD |
1560 | lttng_free_event_filter_runtime(event); |
1561 | /* Free event enabler refs */ | |
1562 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1563 | &event_priv->enablers_ref_head, node) | |
1564 | kfree(enabler_ref); | |
b4a75708 | 1565 | |
0648898e MD |
1566 | switch (event->type) { |
1567 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1568 | { | |
1569 | struct lttng_kernel_event_recorder *event_recorder = | |
1570 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1571 | |
0648898e MD |
1572 | switch (event_priv->instrumentation) { |
1573 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1574 | lttng_event_desc_put(event_priv->desc); | |
1575 | break; | |
b4a75708 | 1576 | |
0648898e MD |
1577 | case LTTNG_KERNEL_ABI_KPROBE: |
1578 | module_put(event_priv->desc->owner); | |
6a35e5bd | 1579 | lttng_kprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1580 | break; |
b4a75708 | 1581 | |
0648898e MD |
1582 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1583 | module_put(event_priv->desc->owner); | |
eb6b47db | 1584 | lttng_kretprobes_destroy_private(&event_recorder->parent); |
0648898e | 1585 | break; |
b4a75708 | 1586 | |
0648898e MD |
1587 | case LTTNG_KERNEL_ABI_SYSCALL: |
1588 | break; | |
4e3c1b9b | 1589 | |
0648898e MD |
1590 | case LTTNG_KERNEL_ABI_UPROBE: |
1591 | module_put(event_priv->desc->owner); | |
17806c46 | 1592 | lttng_uprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1593 | break; |
3ef5cc03 | 1594 | |
c190d76e MJ |
1595 | case LTTNG_KERNEL_ABI_FUNCTION: |
1596 | lttng_fallthrough; | |
1597 | case LTTNG_KERNEL_ABI_NOOP: | |
1598 | lttng_fallthrough; | |
0648898e MD |
1599 | default: |
1600 | WARN_ON_ONCE(1); | |
1601 | } | |
1602 | list_del(&event_recorder->priv->node); | |
1603 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1604 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1605 | break; |
0648898e MD |
1606 | } |
1607 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1608 | { | |
1609 | struct lttng_kernel_event_notifier *event_notifier = | |
1610 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1611 | |
0648898e MD |
1612 | switch (event_notifier->priv->parent.instrumentation) { |
1613 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1614 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1615 | break; | |
b4a75708 | 1616 | |
0648898e MD |
1617 | case LTTNG_KERNEL_ABI_KPROBE: |
1618 | module_put(event_notifier->priv->parent.desc->owner); | |
6a35e5bd | 1619 | lttng_kprobes_destroy_event_private(&event_notifier->parent); |
0648898e | 1620 | break; |
b4a75708 | 1621 | |
0648898e MD |
1622 | case LTTNG_KERNEL_ABI_SYSCALL: |
1623 | break; | |
b4a75708 | 1624 | |
0648898e MD |
1625 | case LTTNG_KERNEL_ABI_UPROBE: |
1626 | module_put(event_notifier->priv->parent.desc->owner); | |
17806c46 | 1627 | lttng_uprobes_destroy_event_private(&event_notifier->parent); |
0648898e MD |
1628 | break; |
1629 | ||
c190d76e MJ |
1630 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1631 | lttng_fallthrough; | |
1632 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1633 | lttng_fallthrough; | |
1634 | case LTTNG_KERNEL_ABI_NOOP: | |
1635 | lttng_fallthrough; | |
0648898e MD |
1636 | default: |
1637 | WARN_ON_ONCE(1); | |
1638 | } | |
1639 | list_del(&event_notifier->priv->node); | |
1640 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1641 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1642 | break; | |
1643 | } | |
dffef45d FD |
1644 | default: |
1645 | WARN_ON_ONCE(1); | |
1646 | } | |
dffef45d FD |
1647 | } |
1648 | ||
8c0393c3 | 1649 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1650 | enum tracker_type tracker_type) |
e0130fab | 1651 | { |
d1f652f8 MD |
1652 | switch (tracker_type) { |
1653 | case TRACKER_PID: | |
1654 | return &session->pid_tracker; | |
1655 | case TRACKER_VPID: | |
1656 | return &session->vpid_tracker; | |
1657 | case TRACKER_UID: | |
1658 | return &session->uid_tracker; | |
1659 | case TRACKER_VUID: | |
1660 | return &session->vuid_tracker; | |
1661 | case TRACKER_GID: | |
1662 | return &session->gid_tracker; | |
1663 | case TRACKER_VGID: | |
1664 | return &session->vgid_tracker; | |
1665 | default: | |
1666 | WARN_ON_ONCE(1); | |
1667 | return NULL; | |
1668 | } | |
1669 | } | |
1670 | ||
8cdc1a81 | 1671 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1672 | enum tracker_type tracker_type, int id) |
1673 | { | |
8c0393c3 | 1674 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1675 | int ret; |
1676 | ||
d1f652f8 MD |
1677 | tracker = get_tracker(session, tracker_type); |
1678 | if (!tracker) | |
1679 | return -EINVAL; | |
1680 | if (id < -1) | |
e0130fab MD |
1681 | return -EINVAL; |
1682 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1683 | if (id == -1) { |
1684 | /* track all ids: destroy tracker. */ | |
1685 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1686 | ret = 0; |
1687 | } else { | |
d1f652f8 | 1688 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1689 | } |
e0130fab MD |
1690 | mutex_unlock(&sessions_mutex); |
1691 | return ret; | |
1692 | } | |
1693 | ||
8cdc1a81 | 1694 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1695 | enum tracker_type tracker_type, int id) |
e0130fab | 1696 | { |
8c0393c3 | 1697 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1698 | int ret; |
1699 | ||
d1f652f8 MD |
1700 | tracker = get_tracker(session, tracker_type); |
1701 | if (!tracker) | |
1702 | return -EINVAL; | |
1703 | if (id < -1) | |
e0130fab MD |
1704 | return -EINVAL; |
1705 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1706 | if (id == -1) { |
1707 | /* untrack all ids: replace by empty tracker. */ | |
1708 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1709 | } else { |
d1f652f8 | 1710 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1711 | } |
e0130fab MD |
1712 | mutex_unlock(&sessions_mutex); |
1713 | return ret; | |
1714 | } | |
1715 | ||
7e6f9ef6 | 1716 | static |
d1f652f8 | 1717 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1718 | { |
8c0393c3 MD |
1719 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1720 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1721 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1722 | int iter = 0, i; |
1723 | ||
1724 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1725 | if (id_tracker_p) { |
1726 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1727 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1728 | |
f934e302 | 1729 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1730 | if (iter++ >= *pos) |
1731 | return e; | |
1732 | } | |
1733 | } | |
1734 | } else { | |
d1f652f8 | 1735 | /* ID tracker disabled. */ |
7e6f9ef6 | 1736 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1737 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1738 | } |
1739 | iter++; | |
1740 | } | |
1741 | /* End of list */ | |
1742 | return NULL; | |
1743 | } | |
1744 | ||
1745 | /* Called with sessions_mutex held. */ | |
1746 | static | |
d1f652f8 | 1747 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1748 | { |
8c0393c3 MD |
1749 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1750 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1751 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1752 | int iter = 0, i; |
1753 | ||
1754 | (*ppos)++; | |
d1f652f8 MD |
1755 | if (id_tracker_p) { |
1756 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1757 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1758 | |
f934e302 | 1759 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1760 | if (iter++ >= *ppos) |
1761 | return e; | |
1762 | } | |
1763 | } | |
1764 | } else { | |
d1f652f8 | 1765 | /* ID tracker disabled. */ |
7e6f9ef6 | 1766 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1767 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1768 | iter++; |
1769 | } | |
1770 | ||
1771 | /* End of list */ | |
1772 | return NULL; | |
1773 | } | |
1774 | ||
1775 | static | |
d1f652f8 | 1776 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1777 | { |
1778 | mutex_unlock(&sessions_mutex); | |
1779 | } | |
1780 | ||
1781 | static | |
d1f652f8 | 1782 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1783 | { |
8c0393c3 MD |
1784 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1785 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1786 | int id; |
7e6f9ef6 | 1787 | |
d1f652f8 | 1788 | if (p == id_tracker_p) { |
7e6f9ef6 | 1789 | /* Tracker disabled. */ |
d1f652f8 | 1790 | id = -1; |
7e6f9ef6 | 1791 | } else { |
d1f652f8 | 1792 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1793 | |
d1f652f8 MD |
1794 | id = lttng_id_tracker_get_node_id(e); |
1795 | } | |
8c0393c3 | 1796 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1797 | case TRACKER_PID: |
1798 | seq_printf(m, "process { pid = %d; };\n", id); | |
1799 | break; | |
1800 | case TRACKER_VPID: | |
1801 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1802 | break; | |
1803 | case TRACKER_UID: | |
1804 | seq_printf(m, "user { uid = %d; };\n", id); | |
1805 | break; | |
1806 | case TRACKER_VUID: | |
1807 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1808 | break; | |
1809 | case TRACKER_GID: | |
1810 | seq_printf(m, "group { gid = %d; };\n", id); | |
1811 | break; | |
1812 | case TRACKER_VGID: | |
1813 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1814 | break; | |
1815 | default: | |
1816 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1817 | } |
7e6f9ef6 MD |
1818 | return 0; |
1819 | } | |
1820 | ||
1821 | static | |
d1f652f8 MD |
1822 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1823 | .start = id_list_start, | |
1824 | .next = id_list_next, | |
1825 | .stop = id_list_stop, | |
1826 | .show = id_list_show, | |
7e6f9ef6 MD |
1827 | }; |
1828 | ||
1829 | static | |
d1f652f8 | 1830 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1831 | { |
d1f652f8 | 1832 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1833 | } |
1834 | ||
1835 | static | |
d1f652f8 | 1836 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1837 | { |
1838 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1839 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1840 | int ret; |
1841 | ||
d1f652f8 | 1842 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1843 | ret = seq_release(inode, file); |
d1f652f8 | 1844 | if (!ret) |
8c0393c3 | 1845 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1846 | return ret; |
1847 | } | |
1848 | ||
d1f652f8 | 1849 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1850 | .owner = THIS_MODULE, |
d1f652f8 | 1851 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1852 | .read = seq_read, |
1853 | .llseek = seq_lseek, | |
d1f652f8 | 1854 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1855 | }; |
1856 | ||
8cdc1a81 | 1857 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1858 | enum tracker_type tracker_type) |
7e6f9ef6 | 1859 | { |
d1f652f8 | 1860 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1861 | struct seq_file *m; |
1862 | int file_fd, ret; | |
1863 | ||
1864 | file_fd = lttng_get_unused_fd(); | |
1865 | if (file_fd < 0) { | |
1866 | ret = file_fd; | |
1867 | goto fd_error; | |
1868 | } | |
1869 | ||
d1f652f8 MD |
1870 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1871 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1872 | NULL, O_RDWR); |
d1f652f8 MD |
1873 | if (IS_ERR(tracker_ids_list_file)) { |
1874 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1875 | goto file_error; |
1876 | } | |
8cdc1a81 | 1877 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1878 | ret = -EOVERFLOW; |
9c1f4643 MD |
1879 | goto refcount_error; |
1880 | } | |
d1f652f8 | 1881 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1882 | if (ret < 0) |
1883 | goto open_error; | |
d1f652f8 MD |
1884 | m = tracker_ids_list_file->private_data; |
1885 | ||
1886 | m->private = get_tracker(session, tracker_type); | |
1887 | BUG_ON(!m->private); | |
1888 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1889 | |
1890 | return file_fd; | |
1891 | ||
1892 | open_error: | |
8cdc1a81 | 1893 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1894 | refcount_error: |
d1f652f8 | 1895 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1896 | file_error: |
1897 | put_unused_fd(file_fd); | |
1898 | fd_error: | |
1899 | return ret; | |
1900 | } | |
1901 | ||
3c997079 MD |
1902 | /* |
1903 | * Enabler management. | |
1904 | */ | |
1905 | static | |
4993071a PP |
1906 | int lttng_match_enabler_star_glob(const char *desc_name, |
1907 | const char *pattern) | |
3c997079 | 1908 | { |
cbc19040 MD |
1909 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1910 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1911 | return 0; |
1912 | return 1; | |
1913 | } | |
1914 | ||
1915 | static | |
4ecb5ad5 MD |
1916 | int lttng_match_enabler_name(const char *desc_name, |
1917 | const char *name) | |
3c997079 | 1918 | { |
4ecb5ad5 | 1919 | if (strcmp(desc_name, name)) |
3c997079 MD |
1920 | return 0; |
1921 | return 1; | |
1922 | } | |
1923 | ||
437d5aa5 | 1924 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
8d554755 | 1925 | struct lttng_event_enabler_common *enabler) |
3c997079 | 1926 | { |
4ecb5ad5 | 1927 | const char *desc_name, *enabler_name; |
badfe9f5 | 1928 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1929 | |
1930 | enabler_name = enabler->event_param.name; | |
1931 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1932 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1933 | desc_name = desc->event_name; |
3b861b22 FD |
1934 | switch (enabler->format_type) { |
1935 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1936 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1937 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1938 | return lttng_match_enabler_name(desc_name, enabler_name); |
1939 | default: | |
1940 | return -EINVAL; | |
1941 | } | |
4ecb5ad5 | 1942 | break; |
b4a75708 | 1943 | |
606828e4 | 1944 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1945 | desc_name = desc->event_name; |
badfe9f5 | 1946 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1947 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1948 | compat = true; |
1949 | } | |
4ecb5ad5 MD |
1950 | if (!strncmp(desc_name, "syscall_exit_", |
1951 | strlen("syscall_exit_"))) { | |
1952 | desc_name += strlen("syscall_exit_"); | |
1953 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1954 | strlen("syscall_entry_"))) { | |
1955 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1956 | entry = true; |
4ecb5ad5 MD |
1957 | } else { |
1958 | WARN_ON_ONCE(1); | |
1959 | return -EINVAL; | |
1960 | } | |
badfe9f5 | 1961 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1962 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1963 | break; |
606828e4 | 1964 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1965 | if (!entry) |
1966 | return 0; | |
1967 | break; | |
606828e4 | 1968 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1969 | if (entry) |
1970 | return 0; | |
1971 | break; | |
1972 | default: | |
1973 | return -EINVAL; | |
1974 | } | |
1975 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1976 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1977 | break; |
606828e4 | 1978 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1979 | if (compat) |
1980 | return 0; | |
1981 | break; | |
606828e4 | 1982 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1983 | if (!compat) |
1984 | return 0; | |
1985 | break; | |
1986 | default: | |
1987 | return -EINVAL; | |
1988 | } | |
1989 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 1990 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1991 | switch (enabler->format_type) { |
1992 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1993 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1994 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1995 | return lttng_match_enabler_name(desc_name, enabler_name); |
1996 | default: | |
1997 | return -EINVAL; | |
1998 | } | |
1999 | break; | |
606828e4 | 2000 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2001 | return -EINVAL; /* Not implemented. */ |
2002 | default: | |
2003 | return -EINVAL; | |
2004 | } | |
4ecb5ad5 | 2005 | break; |
b4a75708 | 2006 | |
4ecb5ad5 MD |
2007 | default: |
2008 | WARN_ON_ONCE(1); | |
2009 | return -EINVAL; | |
2010 | } | |
3c997079 MD |
2011 | } |
2012 | ||
2013 | static | |
1ae083ba | 2014 | int lttng_event_enabler_match_event(struct lttng_event_recorder_enabler *event_enabler, |
a67ba386 | 2015 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2016 | { |
1ae083ba | 2017 | struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler( |
b2bc0bc8 FD |
2018 | event_enabler); |
2019 | ||
a67ba386 | 2020 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2021 | return 0; |
a67ba386 MD |
2022 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2023 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2024 | return 1; |
2025 | else | |
2026 | return 0; | |
2027 | } | |
2028 | ||
b01155ba FD |
2029 | static |
2030 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2031 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba | 2032 | { |
8d554755 | 2033 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler( |
b01155ba FD |
2034 | event_notifier_enabler); |
2035 | ||
a67ba386 | 2036 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2037 | return 0; |
a67ba386 MD |
2038 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2039 | && event_notifier->priv->group == event_notifier_enabler->group | |
5b9817ae | 2040 | && event_notifier->priv->parent.user_token == event_notifier_enabler->parent.user_token) |
b01155ba FD |
2041 | return 1; |
2042 | else | |
2043 | return 0; | |
2044 | } | |
2045 | ||
3c997079 | 2046 | static |
b2bc0bc8 FD |
2047 | struct lttng_enabler_ref *lttng_enabler_ref( |
2048 | struct list_head *enablers_ref_list, | |
8d554755 | 2049 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2050 | { |
2051 | struct lttng_enabler_ref *enabler_ref; | |
2052 | ||
b2bc0bc8 | 2053 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2054 | if (enabler_ref->ref == enabler) |
2055 | return enabler_ref; | |
2056 | } | |
2057 | return NULL; | |
2058 | } | |
2059 | ||
3c997079 | 2060 | static |
1ae083ba | 2061 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler *event_enabler) |
3c997079 | 2062 | { |
0def9170 | 2063 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent); |
437d5aa5 MD |
2064 | struct lttng_kernel_probe_desc *probe_desc; |
2065 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2066 | int i; |
2067 | struct list_head *probe_list; | |
2068 | ||
2069 | probe_list = lttng_get_probe_list_head(); | |
2070 | /* | |
2071 | * For each probe event, if we find that a probe event matches | |
2072 | * our enabler, create an associated lttng_event if not | |
2073 | * already present. | |
2074 | */ | |
2075 | list_for_each_entry(probe_desc, probe_list, head) { | |
2076 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2077 | int found = 0; | |
2078 | struct hlist_head *head; | |
19bef247 | 2079 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
a67ba386 | 2080 | struct lttng_kernel_event_recorder *event_recorder; |
19bef247 | 2081 | struct lttng_kernel_event_common_private *event_priv; |
3c997079 MD |
2082 | |
2083 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 | 2084 | if (!lttng_desc_match_enabler(desc, |
1ae083ba | 2085 | lttng_event_recorder_enabler_as_enabler(event_enabler))) |
3c997079 | 2086 | continue; |
3c997079 MD |
2087 | |
2088 | /* | |
2089 | * Check if already created. | |
2090 | */ | |
0def9170 | 2091 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 MD |
2092 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
2093 | event_recorder_priv = container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
2094 | if (event_priv->desc == desc | |
2095 | && event_recorder_priv->pub->chan == event_enabler->chan) | |
3c997079 MD |
2096 | found = 1; |
2097 | } | |
2098 | if (found) | |
2099 | continue; | |
2100 | ||
2101 | /* | |
2102 | * We need to create an event for this | |
2103 | * event probe. | |
2104 | */ | |
def1e304 | 2105 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); |
a67ba386 | 2106 | if (!event_recorder) { |
5a15f70c | 2107 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2108 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2109 | } |
2110 | } | |
2111 | } | |
2112 | } | |
2113 | ||
b01155ba FD |
2114 | static |
2115 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2116 | { | |
0def9170 | 2117 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_notifier_enabler->parent); |
437d5aa5 MD |
2118 | struct lttng_kernel_probe_desc *probe_desc; |
2119 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2120 | int i; |
2121 | struct list_head *probe_list; | |
2122 | ||
2123 | probe_list = lttng_get_probe_list_head(); | |
2124 | /* | |
2125 | * For each probe event, if we find that a probe event matches | |
2126 | * our enabler, create an associated lttng_event_notifier if not | |
2127 | * already present. | |
2128 | */ | |
2129 | list_for_each_entry(probe_desc, probe_list, head) { | |
2130 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2131 | int found = 0; | |
2132 | struct hlist_head *head; | |
a67ba386 | 2133 | struct lttng_kernel_event_notifier *event_notifier; |
19bef247 | 2134 | struct lttng_kernel_event_common_private *event_priv; |
b01155ba FD |
2135 | |
2136 | desc = probe_desc->event_desc[i]; | |
2137 | if (!lttng_desc_match_enabler(desc, | |
2138 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2139 | continue; | |
2140 | ||
2141 | /* | |
2142 | * Check if already created. | |
2143 | */ | |
0def9170 | 2144 | head = utils_borrow_hash_table_bucket(events_ht->table, |
33af697f | 2145 | LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 MD |
2146 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
2147 | if (event_priv->desc == desc | |
2148 | && event_priv->user_token == event_notifier_enabler->parent.user_token) | |
b01155ba FD |
2149 | found = 1; |
2150 | } | |
2151 | if (found) | |
2152 | continue; | |
2153 | ||
2154 | /* | |
2155 | * We need to create a event_notifier for this event probe. | |
2156 | */ | |
1bbb5b2d | 2157 | event_notifier = _lttng_event_notifier_create(event_notifier_enabler, desc); |
b01155ba FD |
2158 | if (IS_ERR(event_notifier)) { |
2159 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2160 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2161 | } |
2162 | } | |
2163 | } | |
2164 | } | |
2165 | ||
33a39a3c | 2166 | static |
053554ae | 2167 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c MD |
2168 | { |
2169 | int ret; | |
2170 | ||
053554ae | 2171 | ret = lttng_syscalls_register_event(event_enabler); |
8a8ac9a8 | 2172 | WARN_ON_ONCE(ret); |
8a8ac9a8 FD |
2173 | } |
2174 | ||
33a39a3c | 2175 | /* |
a67ba386 | 2176 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2177 | * tracepoint probes. |
2178 | * Should be called with sessions mutex held. | |
2179 | */ | |
2180 | static | |
1ae083ba | 2181 | void lttng_create_event_if_missing(struct lttng_event_recorder_enabler *event_enabler) |
33a39a3c | 2182 | { |
5b9817ae | 2183 | switch (event_enabler->parent.event_param.instrumentation) { |
606828e4 | 2184 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2185 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2186 | break; |
b4a75708 | 2187 | |
606828e4 | 2188 | case LTTNG_KERNEL_ABI_SYSCALL: |
053554ae | 2189 | lttng_create_syscall_event_if_missing(&event_enabler->parent); |
33a39a3c | 2190 | break; |
b4a75708 | 2191 | |
33a39a3c MD |
2192 | default: |
2193 | WARN_ON_ONCE(1); | |
2194 | break; | |
2195 | } | |
2196 | } | |
2197 | ||
3c997079 | 2198 | /* |
b2bc0bc8 | 2199 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2200 | * and add backward reference from the event to the enabler. |
2201 | * Should be called with sessions mutex held. | |
2202 | */ | |
2203 | static | |
1ae083ba | 2204 | int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler *event_enabler) |
3c997079 | 2205 | { |
f7d06400 MD |
2206 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
2207 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; | |
1ae083ba | 2208 | struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(event_enabler); |
a67ba386 | 2209 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2210 | |
606828e4 MD |
2211 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2212 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2213 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2214 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2215 | int enabled = base_enabler->enabled; |
606828e4 | 2216 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2217 | |
606828e4 | 2218 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2219 | WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_entry, enabled); |
3b82c4e1 | 2220 | |
606828e4 | 2221 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2222 | WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_exit, enabled); |
badfe9f5 MD |
2223 | } |
2224 | ||
3c997079 | 2225 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2226 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2227 | |
b2bc0bc8 | 2228 | /* For each event matching event_enabler in session event list. */ |
8cdc1a81 | 2229 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2230 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2231 | struct lttng_enabler_ref *enabler_ref; |
2232 | ||
a67ba386 | 2233 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2234 | continue; |
a67ba386 | 2235 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
1ae083ba | 2236 | lttng_event_recorder_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2237 | if (!enabler_ref) { |
2238 | /* | |
2239 | * If no backward ref, create it. | |
b2bc0bc8 | 2240 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2241 | */ |
2242 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2243 | if (!enabler_ref) | |
2244 | return -ENOMEM; | |
1ae083ba | 2245 | enabler_ref->ref = lttng_event_recorder_enabler_as_enabler(event_enabler); |
3c997079 | 2246 | list_add(&enabler_ref->node, |
a67ba386 | 2247 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2248 | } |
2249 | ||
f127e61e MD |
2250 | /* |
2251 | * Link filter bytecodes if not linked yet. | |
2252 | */ | |
a67ba386 | 2253 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2254 | lttng_static_ctx, |
a67ba386 | 2255 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
1ae083ba | 2256 | <tng_event_recorder_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2257 | } |
2258 | return 0; | |
2259 | } | |
2260 | ||
b01155ba | 2261 | /* |
a67ba386 | 2262 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2263 | * tracepoint probes. |
2264 | * Should be called with sessions mutex held. | |
2265 | */ | |
2266 | static | |
2267 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2268 | { | |
5b9817ae | 2269 | switch (event_notifier_enabler->parent.event_param.instrumentation) { |
606828e4 | 2270 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2271 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2272 | break; | |
b4a75708 | 2273 | |
606828e4 | 2274 | case LTTNG_KERNEL_ABI_SYSCALL: |
053554ae | 2275 | lttng_create_syscall_event_if_missing(&event_notifier_enabler->parent); |
8a8ac9a8 | 2276 | break; |
b4a75708 | 2277 | |
b01155ba FD |
2278 | default: |
2279 | WARN_ON_ONCE(1); | |
2280 | break; | |
2281 | } | |
2282 | } | |
2283 | ||
2284 | /* | |
2285 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2286 | */ | |
2287 | static | |
8a8ac9a8 FD |
2288 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2289 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2290 | { |
2291 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8d554755 | 2292 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2293 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2294 | |
606828e4 MD |
2295 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2296 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2297 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2298 | !strcmp(base_enabler->event_param.name, "*")) { |
2299 | ||
2300 | int enabled = base_enabler->enabled; | |
606828e4 | 2301 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2302 | |
606828e4 | 2303 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2304 | WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_entry, enabled); |
8a8ac9a8 | 2305 | |
606828e4 | 2306 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2307 | WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_exit, enabled); |
8a8ac9a8 FD |
2308 | |
2309 | } | |
2310 | ||
b01155ba FD |
2311 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2312 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2313 | ||
2314 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2315 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2316 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2317 | struct lttng_enabler_ref *enabler_ref; |
2318 | ||
2319 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2320 | continue; | |
2321 | ||
a67ba386 | 2322 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2323 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2324 | if (!enabler_ref) { | |
2325 | /* | |
2326 | * If no backward ref, create it. | |
2327 | * Add backward ref from event_notifier to enabler. | |
2328 | */ | |
2329 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2330 | if (!enabler_ref) | |
2331 | return -ENOMEM; | |
2332 | ||
2333 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2334 | event_notifier_enabler); | |
2335 | list_add(&enabler_ref->node, | |
a67ba386 | 2336 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2337 | } |
2338 | ||
2339 | /* | |
2340 | * Link filter bytecodes if not linked yet. | |
2341 | */ | |
a67ba386 MD |
2342 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2343 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2344 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2345 | |
2346 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2347 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2348 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2349 | &event_notifier_enabler->capture_bytecode_head); |
2350 | ||
a67ba386 | 2351 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2352 | } |
2353 | return 0; | |
2354 | } | |
2355 | ||
3c997079 MD |
2356 | /* |
2357 | * Called at module load: connect the probe on all enablers matching | |
2358 | * this event. | |
2359 | * Called with sessions lock held. | |
2360 | */ | |
2361 | int lttng_fix_pending_events(void) | |
2362 | { | |
8cdc1a81 | 2363 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2364 | |
8cdc1a81 MD |
2365 | list_for_each_entry(session_priv, &sessions, list) |
2366 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2367 | return 0; |
2368 | } | |
2369 | ||
b01155ba FD |
2370 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2371 | struct lttng_event_notifier_group *event_notifier_group) | |
2372 | { | |
2373 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2374 | ||
2375 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2376 | node) { | |
5b9817ae | 2377 | if (event_notifier_enabler->parent.enabled) |
b01155ba FD |
2378 | return true; |
2379 | } | |
2380 | return false; | |
2381 | } | |
2382 | ||
2383 | bool lttng_event_notifier_active(void) | |
2384 | { | |
2385 | struct lttng_event_notifier_group *event_notifier_group; | |
2386 | ||
2387 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2388 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2389 | return true; | |
2390 | } | |
2391 | return false; | |
2392 | } | |
2393 | ||
2394 | int lttng_fix_pending_event_notifiers(void) | |
2395 | { | |
2396 | struct lttng_event_notifier_group *event_notifier_group; | |
2397 | ||
2398 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2399 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2400 | return 0; | |
2401 | } | |
2402 | ||
1ae083ba | 2403 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2404 | enum lttng_enabler_format_type format_type, |
606828e4 | 2405 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2406 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2407 | { |
1ae083ba | 2408 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2409 | |
b2bc0bc8 FD |
2410 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2411 | if (!event_enabler) | |
3c997079 | 2412 | return NULL; |
0bb716a8 | 2413 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2414 | event_enabler->parent.format_type = format_type; |
2415 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2416 | memcpy(&event_enabler->parent.event_param, event_param, | |
2417 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2418 | event_enabler->chan = chan; |
3c997079 | 2419 | /* ctx left NULL */ |
5b9817ae | 2420 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2421 | return event_enabler; |
2422 | } | |
2423 | ||
2424 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2425 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2426 | { |
3c997079 | 2427 | mutex_lock(&sessions_mutex); |
def1e304 MD |
2428 | list_add(&event_enabler->node, &session->priv->enablers_head); |
2429 | event_enabler->published = true; | |
2430 | lttng_session_lazy_sync_event_enablers(session); | |
3c997079 | 2431 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2432 | } |
2433 | ||
7b25ab0e | 2434 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2435 | { |
2436 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2437 | event_enabler->enabled = 1; |
2438 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2439 | mutex_unlock(&sessions_mutex); |
2440 | return 0; | |
2441 | } | |
2442 | ||
7b25ab0e | 2443 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2444 | { |
2445 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2446 | event_enabler->enabled = 0; |
2447 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2448 | mutex_unlock(&sessions_mutex); |
2449 | return 0; | |
2450 | } | |
2451 | ||
b2bc0bc8 | 2452 | static |
8d554755 | 2453 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2454 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2455 | { |
d64ca521 | 2456 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2457 | uint32_t bytecode_len; |
2458 | int ret; | |
2459 | ||
2460 | ret = get_user(bytecode_len, &bytecode->len); | |
2461 | if (ret) | |
2462 | return ret; | |
52cfcdf3 | 2463 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2464 | GFP_KERNEL); |
2465 | if (!bytecode_node) | |
2466 | return -ENOMEM; | |
2467 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2468 | sizeof(*bytecode) + bytecode_len); | |
2469 | if (ret) | |
2470 | goto error_free; | |
b2bc0bc8 | 2471 | |
8a445457 | 2472 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2473 | bytecode_node->enabler = enabler; |
2474 | /* Enforce length based on allocated size */ | |
2475 | bytecode_node->bc.len = bytecode_len; | |
2476 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2477 | |
07dfc1d0 MD |
2478 | return 0; |
2479 | ||
2480 | error_free: | |
52cfcdf3 | 2481 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2482 | return ret; |
2483 | } | |
2484 | ||
6048044f | 2485 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2486 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2487 | { |
2488 | int ret; | |
6048044f | 2489 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2490 | if (ret) |
2491 | goto error; | |
7b25ab0e | 2492 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2493 | return 0; |
2494 | ||
2495 | error: | |
2496 | return ret; | |
2497 | } | |
2498 | ||
e2d5dbc7 | 2499 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2500 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2501 | { |
2502 | ||
e2d5dbc7 | 2503 | switch (event->priv->instrumentation) { |
606828e4 | 2504 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2505 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2506 | default: |
2507 | return -EINVAL; | |
2508 | } | |
2509 | } | |
2510 | ||
3c997079 | 2511 | static |
8d554755 | 2512 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2513 | { |
d64ca521 | 2514 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2515 | |
2516 | /* Destroy filter bytecode */ | |
2517 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2518 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2519 | lttng_kvfree(filter_node); |
07dfc1d0 | 2520 | } |
b2bc0bc8 FD |
2521 | } |
2522 | ||
44b1abdc | 2523 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2524 | { |
44b1abdc MD |
2525 | switch (event_enabler->enabler_type) { |
2526 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2527 | { | |
2528 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2529 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2530 | ||
2531 | lttng_enabler_destroy(event_enabler); | |
2532 | if (event_recorder_enabler->published) | |
2533 | list_del(&event_recorder_enabler->node); | |
2534 | kfree(event_recorder_enabler); | |
2535 | break; | |
2536 | } | |
2537 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2538 | { | |
2539 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2540 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2541 | |
44b1abdc | 2542 | lttng_enabler_destroy(event_enabler); |
1bbb5b2d MD |
2543 | if (event_notifier_enabler->published) |
2544 | list_del(&event_notifier_enabler->node); | |
44b1abdc MD |
2545 | kfree(event_notifier_enabler); |
2546 | break; | |
2547 | } | |
2548 | default: | |
2549 | WARN_ON_ONCE(1); | |
2550 | } | |
3c997079 MD |
2551 | } |
2552 | ||
dffef45d | 2553 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
dffef45d | 2554 | enum lttng_enabler_format_type format_type, |
1bbb5b2d MD |
2555 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
2556 | struct lttng_event_notifier_group *event_notifier_group) | |
dffef45d FD |
2557 | { |
2558 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2559 | ||
2560 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2561 | if (!event_notifier_enabler) | |
2562 | return NULL; | |
2563 | ||
0bb716a8 | 2564 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2565 | event_notifier_enabler->parent.format_type = format_type; |
2566 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2567 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2568 | ||
99f52fcc | 2569 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2570 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2571 | |
5b9817ae MD |
2572 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2573 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2574 | |
5b9817ae MD |
2575 | event_notifier_enabler->parent.enabled = 0; |
2576 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d | 2577 | event_notifier_enabler->group = event_notifier_group; |
1bbb5b2d MD |
2578 | return event_notifier_enabler; |
2579 | } | |
dffef45d | 2580 | |
1bbb5b2d MD |
2581 | void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group, |
2582 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2583 | { | |
dffef45d FD |
2584 | mutex_lock(&sessions_mutex); |
2585 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
1bbb5b2d | 2586 | event_notifier_enabler->published = true; |
b01155ba | 2587 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d | 2588 | mutex_unlock(&sessions_mutex); |
dffef45d FD |
2589 | } |
2590 | ||
2591 | int lttng_event_notifier_enabler_enable( | |
2592 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2593 | { | |
2594 | mutex_lock(&sessions_mutex); | |
2595 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2596 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2597 | mutex_unlock(&sessions_mutex); |
2598 | return 0; | |
2599 | } | |
2600 | ||
2601 | int lttng_event_notifier_enabler_disable( | |
2602 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2603 | { | |
2604 | mutex_lock(&sessions_mutex); | |
2605 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2606 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2607 | mutex_unlock(&sessions_mutex); |
2608 | return 0; | |
2609 | } | |
2610 | ||
99d223ad FD |
2611 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2612 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2613 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2614 | { |
d64ca521 | 2615 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2616 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2617 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2618 | uint32_t bytecode_len; | |
2619 | int ret; | |
2620 | ||
2621 | ret = get_user(bytecode_len, &bytecode->len); | |
2622 | if (ret) | |
2623 | return ret; | |
2624 | ||
2625 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2626 | GFP_KERNEL); | |
2627 | if (!bytecode_node) | |
2628 | return -ENOMEM; | |
2629 | ||
2630 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2631 | sizeof(*bytecode) + bytecode_len); | |
2632 | if (ret) | |
2633 | goto error_free; | |
2634 | ||
8a445457 | 2635 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2636 | bytecode_node->enabler = enabler; |
2637 | ||
2638 | /* Enforce length based on allocated size */ | |
2639 | bytecode_node->bc.len = bytecode_len; | |
2640 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2641 | ||
2642 | event_notifier_enabler->num_captures++; | |
2643 | ||
2644 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2645 | goto end; | |
2646 | ||
2647 | error_free: | |
2648 | lttng_kvfree(bytecode_node); | |
2649 | end: | |
2650 | return ret; | |
2651 | } | |
2652 | ||
3c997079 | 2653 | /* |
b2bc0bc8 | 2654 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2655 | * session. |
2656 | * Should be called with sessions mutex held. | |
2657 | */ | |
2658 | static | |
8cdc1a81 | 2659 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2660 | { |
1ae083ba | 2661 | struct lttng_event_recorder_enabler *event_enabler; |
a67ba386 | 2662 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2663 | |
8cdc1a81 | 2664 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2665 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2666 | /* |
2667 | * For each event, if at least one of its enablers is enabled, | |
2668 | * and its channel and session transient states are enabled, we | |
2669 | * enable the event, else we disable it. | |
2670 | */ | |
8cdc1a81 | 2671 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2672 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2673 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2674 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2675 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2676 | int nr_filters = 0; | |
3c997079 | 2677 | |
a67ba386 | 2678 | switch (event_recorder_priv->parent.instrumentation) { |
c190d76e MJ |
2679 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2680 | lttng_fallthrough; | |
606828e4 | 2681 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
2682 | /* Enable events */ |
2683 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2684 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2685 | if (enabler_ref->ref->enabled) { |
2686 | enabled = 1; | |
2687 | break; | |
2688 | } | |
2689 | } | |
4ecb5ad5 | 2690 | break; |
b4a75708 | 2691 | |
4ecb5ad5 | 2692 | default: |
3c997079 MD |
2693 | /* Not handled with lazy sync. */ |
2694 | continue; | |
2695 | } | |
2696 | /* | |
2697 | * Enabled state is based on union of enablers, with | |
2698 | * intesection of session and channel transient enable | |
2699 | * states. | |
2700 | */ | |
f7d06400 | 2701 | enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; |
3c997079 | 2702 | |
a67ba386 | 2703 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2704 | /* |
2705 | * Sync tracepoint registration with event enabled | |
2706 | * state. | |
2707 | */ | |
2708 | if (enabled) { | |
0c851fa0 | 2709 | register_event(&event_recorder->parent); |
3c997079 | 2710 | } else { |
f0bcc14c | 2711 | _lttng_event_unregister(&event_recorder->parent); |
3c997079 | 2712 | } |
07dfc1d0 MD |
2713 | |
2714 | /* Check if has enablers without bytecode enabled */ | |
2715 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2716 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2717 | if (enabler_ref->ref->enabled |
2718 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2719 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2720 | break; |
2721 | } | |
2722 | } | |
a67ba386 | 2723 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2724 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2725 | |
2726 | /* Enable filters */ | |
2727 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2728 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2729 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2730 | nr_filters++; |
2731 | } | |
2732 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2733 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2734 | } |
2735 | } | |
2736 | ||
2737 | /* | |
2738 | * Apply enablers to session events, adding events to session if need | |
2739 | * be. It is required after each modification applied to an active | |
2740 | * session, and right before session "start". | |
2741 | * "lazy" sync means we only sync if required. | |
2742 | * Should be called with sessions mutex held. | |
2743 | */ | |
2744 | static | |
8cdc1a81 | 2745 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2746 | { |
2747 | /* We can skip if session is not active */ | |
2748 | if (!session->active) | |
2749 | return; | |
b2bc0bc8 | 2750 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2751 | } |
2752 | ||
b01155ba FD |
2753 | static |
2754 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2755 | { | |
2756 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2757 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2758 | |
2759 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2760 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2761 | ||
2762 | /* | |
2763 | * For each event_notifier, if at least one of its enablers is enabled, | |
2764 | * we enable the event_notifier, else we disable it. | |
2765 | */ | |
a67ba386 MD |
2766 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2767 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2768 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2769 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2770 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2771 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2772 | |
a67ba386 | 2773 | switch (event_notifier_priv->parent.instrumentation) { |
c190d76e MJ |
2774 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2775 | lttng_fallthrough; | |
606828e4 | 2776 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
2777 | /* Enable event_notifiers */ |
2778 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2779 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2780 | if (enabler_ref->ref->enabled) { |
2781 | enabled = 1; | |
2782 | break; | |
2783 | } | |
2784 | } | |
2785 | break; | |
b4a75708 | 2786 | |
b01155ba FD |
2787 | default: |
2788 | /* Not handled with sync. */ | |
2789 | continue; | |
2790 | } | |
2791 | ||
a67ba386 | 2792 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2793 | /* |
2794 | * Sync tracepoint registration with event_notifier enabled | |
2795 | * state. | |
2796 | */ | |
2797 | if (enabled) { | |
a67ba386 | 2798 | if (!event_notifier_priv->parent.registered) |
0c851fa0 | 2799 | register_event(&event_notifier->parent); |
b01155ba | 2800 | } else { |
a67ba386 | 2801 | if (event_notifier_priv->parent.registered) |
f0bcc14c | 2802 | _lttng_event_unregister(&event_notifier->parent); |
b01155ba FD |
2803 | } |
2804 | ||
2805 | /* Check if has enablers without bytecode enabled */ | |
2806 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2807 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2808 | if (enabler_ref->ref->enabled |
2809 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2810 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2811 | break; |
2812 | } | |
2813 | } | |
a67ba386 | 2814 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2815 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2816 | |
2817 | /* Enable filters */ | |
2818 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2819 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2820 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2821 | nr_filters++; |
2822 | } | |
2823 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2824 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2825 | |
2826 | /* Enable captures */ | |
2827 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2828 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2829 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2830 | nr_captures++; |
2831 | } | |
2832 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2833 | } |
2834 | } | |
2835 | ||
7b25ab0e MD |
2836 | static |
2837 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2838 | { | |
2839 | switch (event_enabler->enabler_type) { | |
2840 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2841 | { | |
2842 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2843 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2844 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2845 | break; | |
2846 | } | |
2847 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2848 | { | |
2849 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2850 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2851 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2852 | break; | |
2853 | } | |
2854 | default: | |
2855 | WARN_ON_ONCE(1); | |
2856 | } | |
2857 | } | |
2858 | ||
1ec3f75a | 2859 | /* |
d83004aa JD |
2860 | * Serialize at most one packet worth of metadata into a metadata |
2861 | * channel. | |
92d9f5e6 MD |
2862 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2863 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2864 | * allows us to do racy operations such as looking for remaining space left in | |
2865 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2866 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2867 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2868 | * Returns the number of bytes written in the channel, 0 if no data |
2869 | * was written and a negative value on error. | |
1ec3f75a | 2870 | */ |
b3b8072b | 2871 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2872 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2873 | { |
8a57ec02 | 2874 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2875 | int ret = 0; |
2876 | size_t len, reserve_len; | |
2877 | ||
f613e3e6 | 2878 | /* |
92d9f5e6 MD |
2879 | * Ensure we support mutiple get_next / put sequences followed by |
2880 | * put_next. The metadata cache lock protects reading the metadata | |
2881 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2882 | * "flush" operations on the buffer invoked by different processes. | |
2883 | * Moreover, since the metadata cache memory can be reallocated, we | |
2884 | * need to have exclusive access against updates even though we only | |
2885 | * read it. | |
f613e3e6 | 2886 | */ |
92d9f5e6 | 2887 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2888 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2889 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2890 | goto end; |
f613e3e6 | 2891 | |
9616f0bf JD |
2892 | /* Metadata regenerated, change the version. */ |
2893 | if (stream->metadata_cache->version != stream->version) | |
2894 | stream->version = stream->metadata_cache->version; | |
2895 | ||
d83004aa | 2896 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2897 | stream->metadata_in; |
9de2c215 | 2898 | if (!len) |
de23d59d | 2899 | goto end; |
d83004aa | 2900 | reserve_len = min_t(size_t, |
4a399b76 | 2901 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2902 | len); |
a775608d | 2903 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2904 | sizeof(char), NULL); |
d83004aa JD |
2905 | /* |
2906 | * If reservation failed, return an error to the caller. | |
2907 | */ | |
c2fb9c1c | 2908 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2909 | if (ret != 0) { |
2910 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2911 | stream->coherent = false; |
d83004aa JD |
2912 | goto end; |
2913 | } | |
b3b8072b | 2914 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2915 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2916 | reserve_len, 1); |
b3b8072b | 2917 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2918 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2919 | if (reserve_len < len) |
8b97fd42 MD |
2920 | stream->coherent = false; |
2921 | else | |
2922 | stream->coherent = true; | |
d83004aa JD |
2923 | ret = reserve_len; |
2924 | ||
2925 | end: | |
8b97fd42 MD |
2926 | if (coherent) |
2927 | *coherent = stream->coherent; | |
92d9f5e6 | 2928 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2929 | return ret; |
2930 | } | |
2931 | ||
8b97fd42 | 2932 | static |
8cdc1a81 | 2933 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2934 | { |
8cdc1a81 MD |
2935 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2936 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2937 | } |
2938 | ||
2939 | static | |
8cdc1a81 | 2940 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2941 | { |
8cdc1a81 MD |
2942 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2943 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2944 | struct lttng_metadata_stream *stream; |
2945 | ||
8cdc1a81 | 2946 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2947 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2948 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2949 | } |
8b97fd42 MD |
2950 | } |
2951 | ||
d83004aa JD |
2952 | /* |
2953 | * Write the metadata to the metadata cache. | |
2954 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2955 | * The metadata cache lock protects us from concurrent read access from |
2956 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2957 | * The content of the printf is printed as a single atomic metadata |
2958 | * transaction. | |
d83004aa | 2959 | */ |
8cdc1a81 | 2960 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2961 | const char *fmt, ...) |
2962 | { | |
c099397a | 2963 | char *str; |
d83004aa | 2964 | size_t len; |
c099397a MD |
2965 | va_list ap; |
2966 | ||
585e5dcc | 2967 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2968 | |
2969 | va_start(ap, fmt); | |
2970 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2971 | va_end(ap); | |
2972 | if (!str) | |
2973 | return -ENOMEM; | |
2974 | ||
1ec3f75a | 2975 | len = strlen(str); |
8cdc1a81 MD |
2976 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2977 | if (session->priv->metadata_cache->metadata_written + len > | |
2978 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
2979 | char *tmp_cache_realloc; |
2980 | unsigned int tmp_cache_alloc_size; | |
2981 | ||
2982 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
2983 | session->priv->metadata_cache->cache_alloc + len, |
2984 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2985 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2986 | if (!tmp_cache_realloc) |
2987 | goto err; | |
8cdc1a81 | 2988 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 2989 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
2990 | session->priv->metadata_cache->data, |
2991 | session->priv->metadata_cache->cache_alloc); | |
2992 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
2993 | } |
2994 | ||
8cdc1a81 MD |
2995 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2996 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2997 | } |
8cdc1a81 MD |
2998 | memcpy(session->priv->metadata_cache->data + |
2999 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3000 | str, len); |
8cdc1a81 | 3001 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3002 | kfree(str); |
d83004aa | 3003 | |
d83004aa JD |
3004 | return 0; |
3005 | ||
3006 | err: | |
3007 | kfree(str); | |
3008 | return -ENOMEM; | |
c099397a MD |
3009 | } |
3010 | ||
f513b2bf | 3011 | static |
8cdc1a81 | 3012 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3013 | { |
3014 | size_t i; | |
3015 | ||
3016 | for (i = 0; i < nesting; i++) { | |
3017 | int ret; | |
3018 | ||
3019 | ret = lttng_metadata_printf(session, " "); | |
3020 | if (ret) { | |
3021 | return ret; | |
3022 | } | |
3023 | } | |
3024 | return 0; | |
3025 | } | |
3026 | ||
ceabb767 | 3027 | static |
8cdc1a81 | 3028 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3029 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3030 | size_t nesting) |
3031 | { | |
3032 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3033 | } | |
3034 | ||
3035 | static | |
8cdc1a81 | 3036 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3037 | const struct lttng_kernel_type_integer *type, |
3038 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3039 | size_t nesting) |
3040 | { | |
3041 | int ret; | |
3042 | ||
ceabb767 MD |
3043 | ret = print_tabs(session, nesting); |
3044 | if (ret) | |
3045 | return ret; | |
3046 | ret = lttng_metadata_printf(session, | |
3047 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3048 | type->size, |
3049 | type->alignment, | |
3050 | type->signedness, | |
3051 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3052 | ? "none" |
437d5aa5 | 3053 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3054 | ? "UTF8" |
3055 | : "ASCII", | |
437d5aa5 | 3056 | type->base, |
ceabb767 | 3057 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3058 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3059 | #else |
437d5aa5 | 3060 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3061 | #endif |
3062 | ); | |
3063 | return ret; | |
3064 | } | |
3065 | ||
f513b2bf MD |
3066 | /* |
3067 | * Must be called with sessions_mutex held. | |
3068 | */ | |
3069 | static | |
8cdc1a81 | 3070 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3071 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3072 | size_t nesting) |
3073 | { | |
51ef4536 | 3074 | const char *prev_field_name = NULL; |
f513b2bf MD |
3075 | int ret; |
3076 | uint32_t i, nr_fields; | |
ceabb767 MD |
3077 | unsigned int alignment; |
3078 | ||
f513b2bf MD |
3079 | ret = print_tabs(session, nesting); |
3080 | if (ret) | |
3081 | return ret; | |
3082 | ret = lttng_metadata_printf(session, | |
3083 | "struct {\n"); | |
3084 | if (ret) | |
3085 | return ret; | |
437d5aa5 | 3086 | nr_fields = type->nr_fields; |
f513b2bf | 3087 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3088 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3089 | |
437d5aa5 | 3090 | iter_field = type->fields[i]; |
51ef4536 | 3091 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3092 | if (ret) |
3093 | return ret; | |
3094 | } | |
3095 | ret = print_tabs(session, nesting); | |
3096 | if (ret) | |
3097 | return ret; | |
437d5aa5 | 3098 | alignment = type->alignment; |
ceabb767 MD |
3099 | if (alignment) { |
3100 | ret = lttng_metadata_printf(session, | |
3101 | "} align(%u)", | |
3102 | alignment); | |
3103 | } else { | |
3104 | ret = lttng_metadata_printf(session, | |
3105 | "}"); | |
3106 | } | |
f513b2bf MD |
3107 | return ret; |
3108 | } | |
3109 | ||
3110 | /* | |
3111 | * Must be called with sessions_mutex held. | |
3112 | */ | |
3113 | static | |
8cdc1a81 | 3114 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3115 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3116 | size_t nesting) |
3117 | { | |
3118 | int ret; | |
3119 | ||
3120 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3121 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3122 | if (ret) |
3123 | return ret; | |
ceabb767 | 3124 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3125 | } |
3126 | ||
65c85aa6 MD |
3127 | /* |
3128 | * Must be called with sessions_mutex held. | |
3129 | */ | |
3130 | static | |
8cdc1a81 | 3131 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3132 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3133 | size_t nesting, |
3134 | const char *prev_field_name) | |
65c85aa6 | 3135 | { |
51ef4536 | 3136 | const char *tag_name; |
65c85aa6 MD |
3137 | int ret; |
3138 | uint32_t i, nr_choices; | |
3139 | ||
51ef4536 MD |
3140 | tag_name = type->tag_name; |
3141 | if (!tag_name) | |
3142 | tag_name = prev_field_name; | |
3143 | if (!tag_name) | |
3144 | return -EINVAL; | |
ceabb767 MD |
3145 | /* |
3146 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3147 | */ | |
437d5aa5 | 3148 | if (type->alignment != 0) |
ceabb767 | 3149 | return -EINVAL; |
65c85aa6 MD |
3150 | ret = print_tabs(session, nesting); |
3151 | if (ret) | |
3152 | return ret; | |
3153 | ret = lttng_metadata_printf(session, | |
3154 | "variant <_%s> {\n", | |
51ef4536 | 3155 | tag_name); |
65c85aa6 MD |
3156 | if (ret) |
3157 | return ret; | |
437d5aa5 | 3158 | nr_choices = type->nr_choices; |
65c85aa6 | 3159 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3160 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3161 | |
437d5aa5 | 3162 | iter_field = type->choices[i]; |
51ef4536 | 3163 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3164 | if (ret) |
3165 | return ret; | |
3166 | } | |
3167 | ret = print_tabs(session, nesting); | |
3168 | if (ret) | |
3169 | return ret; | |
3170 | ret = lttng_metadata_printf(session, | |
3171 | "}"); | |
3172 | return ret; | |
3173 | } | |
3174 | ||
3175 | /* | |
3176 | * Must be called with sessions_mutex held. | |
3177 | */ | |
3178 | static | |
8cdc1a81 | 3179 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3180 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3181 | size_t nesting, |
3182 | const char *prev_field_name) | |
65c85aa6 MD |
3183 | { |
3184 | int ret; | |
3185 | ||
3186 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3187 | lttng_kernel_get_type_variant(field->type), nesting, |
3188 | prev_field_name); | |
65c85aa6 MD |
3189 | if (ret) |
3190 | return ret; | |
ceabb767 | 3191 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3192 | } |
3193 | ||
f513b2bf MD |
3194 | /* |
3195 | * Must be called with sessions_mutex held. | |
3196 | */ | |
3197 | static | |
8cdc1a81 | 3198 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3199 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3200 | size_t nesting) |
3201 | { | |
3202 | int ret; | |
437d5aa5 MD |
3203 | const struct lttng_kernel_type_array *array_type; |
3204 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3205 | |
437d5aa5 MD |
3206 | array_type = lttng_kernel_get_type_array(field->type); |
3207 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3208 | |
437d5aa5 | 3209 | if (array_type->alignment) { |
ceabb767 | 3210 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3211 | if (ret) |
3212 | return ret; | |
ceabb767 MD |
3213 | ret = lttng_metadata_printf(session, |
3214 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3215 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3216 | field->name); |
3217 | if (ret) | |
3218 | return ret; | |
3219 | } | |
3220 | /* | |
3221 | * Nested compound types: Only array of structures and variants are | |
3222 | * currently supported. | |
3223 | */ | |
437d5aa5 | 3224 | elem_type = array_type->elem_type; |
12bb2edb MD |
3225 | switch (elem_type->type) { |
3226 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3227 | case lttng_kernel_type_struct: |
3228 | case lttng_kernel_type_variant: | |
3229 | ret = _lttng_type_statedump(session, elem_type, | |
3230 | array_type->encoding, nesting); | |
65c85aa6 MD |
3231 | if (ret) |
3232 | return ret; | |
3233 | break; | |
ceabb767 | 3234 | |
f513b2bf MD |
3235 | default: |
3236 | return -EINVAL; | |
3237 | } | |
3238 | ret = lttng_metadata_printf(session, | |
3239 | " _%s[%u];\n", | |
3240 | field->name, | |
437d5aa5 | 3241 | array_type->length); |
f513b2bf MD |
3242 | return ret; |
3243 | } | |
3244 | ||
3245 | /* | |
3246 | * Must be called with sessions_mutex held. | |
3247 | */ | |
3248 | static | |
8cdc1a81 | 3249 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3250 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3251 | size_t nesting, |
3252 | const char *prev_field_name) | |
f513b2bf MD |
3253 | { |
3254 | int ret; | |
3255 | const char *length_name; | |
437d5aa5 MD |
3256 | const struct lttng_kernel_type_sequence *sequence_type; |
3257 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3258 | |
437d5aa5 MD |
3259 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3260 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3261 | |
437d5aa5 | 3262 | length_name = sequence_type->length_name; |
51ef4536 MD |
3263 | if (!length_name) |
3264 | length_name = prev_field_name; | |
3265 | if (!length_name) | |
3266 | return -EINVAL; | |
ceabb767 | 3267 | |
437d5aa5 | 3268 | if (sequence_type->alignment) { |
ceabb767 | 3269 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3270 | if (ret) |
3271 | return ret; | |
ceabb767 MD |
3272 | ret = lttng_metadata_printf(session, |
3273 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3274 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3275 | field->name); |
3276 | if (ret) | |
3277 | return ret; | |
3278 | } | |
3279 | ||
3280 | /* | |
3281 | * Nested compound types: Only array of structures and variants are | |
3282 | * currently supported. | |
3283 | */ | |
437d5aa5 | 3284 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3285 | switch (elem_type->type) { |
3286 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3287 | case lttng_kernel_type_struct: |
3288 | case lttng_kernel_type_variant: | |
3289 | ret = _lttng_type_statedump(session, elem_type, | |
3290 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3291 | if (ret) |
3292 | return ret; | |
3293 | break; | |
ceabb767 | 3294 | |
f513b2bf MD |
3295 | default: |
3296 | return -EINVAL; | |
3297 | } | |
3298 | ret = lttng_metadata_printf(session, | |
3299 | " _%s[ _%s ];\n", | |
3300 | field->name, | |
51ef4536 | 3301 | length_name); |
f513b2bf MD |
3302 | return ret; |
3303 | } | |
3304 | ||
141ddf28 MD |
3305 | /* |
3306 | * Must be called with sessions_mutex held. | |
3307 | */ | |
3308 | static | |
8cdc1a81 | 3309 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3310 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3311 | size_t nesting) |
3312 | { | |
d96a4a7a | 3313 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3314 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3315 | int ret; |
3316 | unsigned int i, nr_entries; | |
3317 | ||
437d5aa5 | 3318 | container_type = type->container_type; |
12bb2edb | 3319 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3320 | ret = -EINVAL; |
3321 | goto end; | |
3322 | } | |
437d5aa5 | 3323 | enum_desc = type->desc; |
141ddf28 MD |
3324 | nr_entries = enum_desc->nr_entries; |
3325 | ||
3326 | ret = print_tabs(session, nesting); | |
3327 | if (ret) | |
3328 | goto end; | |
ceabb767 MD |
3329 | ret = lttng_metadata_printf(session, "enum : "); |
3330 | if (ret) | |
3331 | goto end; | |
437d5aa5 MD |
3332 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3333 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3334 | if (ret) |
ceabb767 MD |
3335 | goto end; |
3336 | ret = lttng_metadata_printf(session, " {\n"); | |
3337 | if (ret) | |
3338 | goto end; | |
141ddf28 MD |
3339 | /* Dump all entries */ |
3340 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3341 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3342 | int j, len; |
3343 | ||
3344 | ret = print_tabs(session, nesting + 1); | |
3345 | if (ret) | |
3346 | goto end; | |
3347 | ret = lttng_metadata_printf(session, | |
3348 | "\""); | |
3349 | if (ret) | |
3350 | goto end; | |
3351 | len = strlen(entry->string); | |
3352 | /* Escape the character '"' */ | |
3353 | for (j = 0; j < len; j++) { | |
3354 | char c = entry->string[j]; | |
3355 | ||
3356 | switch (c) { | |
3357 | case '"': | |
3358 | ret = lttng_metadata_printf(session, | |
3359 | "\\\""); | |
3360 | break; | |
3361 | case '\\': | |
3362 | ret = lttng_metadata_printf(session, | |
3363 | "\\\\"); | |
3364 | break; | |
3365 | default: | |
3366 | ret = lttng_metadata_printf(session, | |
3367 | "%c", c); | |
3368 | break; | |
3369 | } | |
3370 | if (ret) | |
3371 | goto end; | |
3372 | } | |
08ad1061 PP |
3373 | ret = lttng_metadata_printf(session, "\""); |
3374 | if (ret) | |
3375 | goto end; | |
3376 | ||
3377 | if (entry->options.is_auto) { | |
3378 | ret = lttng_metadata_printf(session, ",\n"); | |
3379 | if (ret) | |
3380 | goto end; | |
141ddf28 | 3381 | } else { |
7c559490 MD |
3382 | ret = lttng_metadata_printf(session, |
3383 | " = "); | |
3384 | if (ret) | |
3385 | goto end; | |
3386 | if (entry->start.signedness) | |
141ddf28 | 3387 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3388 | "%lld", (long long) entry->start.value); |
3389 | else | |
3390 | ret = lttng_metadata_printf(session, | |
3391 | "%llu", entry->start.value); | |
3392 | if (ret) | |
3393 | goto end; | |
3394 | if (entry->start.signedness == entry->end.signedness && | |
3395 | entry->start.value | |
3396 | == entry->end.value) { | |
141ddf28 | 3397 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3398 | ",\n"); |
3399 | } else { | |
3400 | if (entry->end.signedness) { | |
3401 | ret = lttng_metadata_printf(session, | |
3402 | " ... %lld,\n", | |
3403 | (long long) entry->end.value); | |
3404 | } else { | |
3405 | ret = lttng_metadata_printf(session, | |
3406 | " ... %llu,\n", | |
3407 | entry->end.value); | |
3408 | } | |
141ddf28 | 3409 | } |
7c559490 MD |
3410 | if (ret) |
3411 | goto end; | |
141ddf28 | 3412 | } |
141ddf28 MD |
3413 | } |
3414 | ret = print_tabs(session, nesting); | |
3415 | if (ret) | |
3416 | goto end; | |
ceabb767 | 3417 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3418 | end: |
3419 | return ret; | |
3420 | } | |
3421 | ||
d83004aa JD |
3422 | /* |
3423 | * Must be called with sessions_mutex held. | |
3424 | */ | |
c099397a | 3425 | static |
8cdc1a81 | 3426 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3427 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3428 | size_t nesting) |
3429 | { | |
3430 | int ret; | |
437d5aa5 | 3431 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3432 | |
437d5aa5 MD |
3433 | enum_type = lttng_kernel_get_type_enum(field->type); |
3434 | WARN_ON_ONCE(!enum_type); | |
3435 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3436 | if (ret) |
3437 | return ret; | |
3438 | return lttng_field_name_statedump(session, field, nesting); | |
3439 | } | |
3440 | ||
3441 | static | |
8cdc1a81 | 3442 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3443 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3444 | size_t nesting) |
3445 | { | |
3446 | int ret; | |
3447 | ||
437d5aa5 MD |
3448 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3449 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3450 | if (ret) |
3451 | return ret; | |
3452 | return lttng_field_name_statedump(session, field, nesting); | |
3453 | } | |
3454 | ||
3455 | static | |
8cdc1a81 | 3456 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3457 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3458 | size_t nesting) |
3459 | { | |
3460 | int ret; | |
3461 | ||
ceabb767 MD |
3462 | /* Default encoding is UTF8 */ |
3463 | ret = print_tabs(session, nesting); | |
3464 | if (ret) | |
3465 | return ret; | |
3466 | ret = lttng_metadata_printf(session, | |
3467 | "string%s", | |
437d5aa5 | 3468 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3469 | " { encoding = ASCII; }" : ""); |
3470 | return ret; | |
3471 | } | |
3472 | ||
3473 | static | |
8cdc1a81 | 3474 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3475 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3476 | size_t nesting) |
ceabb767 | 3477 | { |
437d5aa5 | 3478 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3479 | int ret; |
3480 | ||
437d5aa5 MD |
3481 | string_type = lttng_kernel_get_type_string(field->type); |
3482 | WARN_ON_ONCE(!string_type); | |
3483 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3484 | if (ret) |
3485 | return ret; | |
3486 | return lttng_field_name_statedump(session, field, nesting); | |
3487 | } | |
3488 | ||
3489 | /* | |
3490 | * Must be called with sessions_mutex held. | |
3491 | */ | |
3492 | static | |
8cdc1a81 | 3493 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3494 | const struct lttng_kernel_type_common *type, |
3495 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3496 | size_t nesting) |
c099397a | 3497 | { |
c099397a | 3498 | int ret = 0; |
c099397a | 3499 | |
12bb2edb MD |
3500 | switch (type->type) { |
3501 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3502 | ret = _lttng_integer_type_statedump(session, |
3503 | lttng_kernel_get_type_integer(type), | |
3504 | parent_encoding, nesting); | |
8070f5c0 | 3505 | break; |
437d5aa5 MD |
3506 | case lttng_kernel_type_enum: |
3507 | ret = _lttng_enum_type_statedump(session, | |
3508 | lttng_kernel_get_type_enum(type), | |
3509 | nesting); | |
8070f5c0 | 3510 | break; |
12bb2edb | 3511 | case lttng_kernel_type_string: |
437d5aa5 MD |
3512 | ret = _lttng_string_type_statedump(session, |
3513 | lttng_kernel_get_type_string(type), | |
3514 | nesting); | |
ceabb767 | 3515 | break; |
437d5aa5 MD |
3516 | case lttng_kernel_type_struct: |
3517 | ret = _lttng_struct_type_statedump(session, | |
3518 | lttng_kernel_get_type_struct(type), | |
3519 | nesting); | |
8070f5c0 | 3520 | break; |
437d5aa5 MD |
3521 | case lttng_kernel_type_variant: |
3522 | ret = _lttng_variant_type_statedump(session, | |
3523 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3524 | nesting, NULL); |
ceabb767 MD |
3525 | break; |
3526 | ||
3527 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3528 | case lttng_kernel_type_array: |
3529 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3530 | default: |
3531 | WARN_ON_ONCE(1); | |
3532 | return -EINVAL; | |
8070f5c0 | 3533 | } |
ceabb767 MD |
3534 | return ret; |
3535 | } | |
8070f5c0 | 3536 | |
ceabb767 MD |
3537 | /* |
3538 | * Must be called with sessions_mutex held. | |
3539 | */ | |
3540 | static | |
8cdc1a81 | 3541 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3542 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3543 | size_t nesting, |
3544 | const char **prev_field_name_p) | |
ceabb767 | 3545 | { |
51ef4536 | 3546 | const char *prev_field_name = NULL; |
ceabb767 | 3547 | int ret = 0; |
27d2368e | 3548 | |
51ef4536 MD |
3549 | if (prev_field_name_p) |
3550 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3551 | switch (field->type->type) { |
12bb2edb | 3552 | case lttng_kernel_type_integer: |
ceabb767 MD |
3553 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3554 | break; | |
437d5aa5 | 3555 | case lttng_kernel_type_enum: |
ceabb767 | 3556 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3557 | break; |
12bb2edb | 3558 | case lttng_kernel_type_string: |
ceabb767 | 3559 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3560 | break; |
437d5aa5 | 3561 | case lttng_kernel_type_struct: |
ceabb767 | 3562 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3563 | break; |
437d5aa5 | 3564 | case lttng_kernel_type_array: |
ceabb767 | 3565 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3566 | break; |
437d5aa5 | 3567 | case lttng_kernel_type_sequence: |
51ef4536 | 3568 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3569 | break; |
437d5aa5 | 3570 | case lttng_kernel_type_variant: |
51ef4536 | 3571 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3572 | break; |
f513b2bf | 3573 | |
8070f5c0 MD |
3574 | default: |
3575 | WARN_ON_ONCE(1); | |
3576 | return -EINVAL; | |
3577 | } | |
51ef4536 MD |
3578 | if (prev_field_name_p) |
3579 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3580 | return ret; |
3581 | } | |
3582 | ||
3583 | static | |
8cdc1a81 | 3584 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3585 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3586 | { |
51ef4536 | 3587 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3588 | int ret = 0; |
3589 | int i; | |
3590 | ||
3591 | if (!ctx) | |
3592 | return 0; | |
3593 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3594 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3595 | |
51ef4536 | 3596 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3597 | if (ret) |
3598 | return ret; | |
3599 | } | |
3600 | return ret; | |
3601 | } | |
3602 | ||
3603 | static | |
8cdc1a81 | 3604 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3605 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3606 | { |
51ef4536 | 3607 | const char *prev_field_name = NULL; |
a67ba386 | 3608 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3609 | int ret = 0; |
3610 | int i; | |
3611 | ||
6c8c025b MD |
3612 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3613 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3614 | |
51ef4536 | 3615 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3616 | if (ret) |
3617 | return ret; | |
c099397a MD |
3618 | } |
3619 | return ret; | |
3620 | } | |
3621 | ||
d83004aa JD |
3622 | /* |
3623 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3624 | * The entire event metadata is printed as a single atomic metadata |
3625 | * transaction. | |
d83004aa | 3626 | */ |
c099397a | 3627 | static |
8cdc1a81 | 3628 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3629 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3630 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3631 | { |
3632 | int ret = 0; | |
3633 | ||
a67ba386 | 3634 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3635 | return 0; |
f7d06400 | 3636 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3637 | return 0; |
3638 | ||
8b97fd42 MD |
3639 | lttng_metadata_begin(session); |
3640 | ||
c099397a MD |
3641 | ret = lttng_metadata_printf(session, |
3642 | "event {\n" | |
ae734547 | 3643 | " name = \"%s\";\n" |
c099397a | 3644 | " id = %u;\n" |
b9074a1b | 3645 | " stream_id = %u;\n", |
a67ba386 MD |
3646 | event_recorder->priv->parent.desc->event_name, |
3647 | event_recorder->priv->id, | |
f7d06400 | 3648 | event_recorder->chan->priv->id); |
c099397a MD |
3649 | if (ret) |
3650 | goto end; | |
3651 | ||
8070f5c0 | 3652 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3653 | " fields := struct {\n" |
3654 | ); | |
3655 | if (ret) | |
3656 | goto end; | |
3657 | ||
a67ba386 | 3658 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3659 | if (ret) |
3660 | goto end; | |
3661 | ||
3662 | /* | |
3663 | * LTTng space reservation can only reserve multiples of the | |
3664 | * byte size. | |
3665 | */ | |
3666 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3667 | " };\n" |
3668 | "};\n\n"); | |
c099397a MD |
3669 | if (ret) |
3670 | goto end; | |
3671 | ||
a67ba386 | 3672 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3673 | end: |
8b97fd42 | 3674 | lttng_metadata_end(session); |
c099397a MD |
3675 | return ret; |
3676 | ||
3677 | } | |
3678 | ||
d83004aa JD |
3679 | /* |
3680 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3681 | * The entire channel metadata is printed as a single atomic metadata |
3682 | * transaction. | |
d83004aa | 3683 | */ |
c099397a | 3684 | static |
8cdc1a81 | 3685 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3686 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3687 | { |
3688 | int ret = 0; | |
3689 | ||
f7d06400 | 3690 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3691 | return 0; |
d83004aa | 3692 | |
f7d06400 | 3693 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3694 | return 0; |
3695 | ||
8b97fd42 MD |
3696 | lttng_metadata_begin(session); |
3697 | ||
f7d06400 | 3698 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3699 | ret = lttng_metadata_printf(session, |
3700 | "stream {\n" | |
3701 | " id = %u;\n" | |
9115fbdc | 3702 | " event.header := %s;\n" |
b9074a1b | 3703 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3704 | chan->priv->id, |
3705 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3706 | "struct event_header_large"); |
3707 | if (ret) | |
3708 | goto end; | |
3709 | ||
f7d06400 | 3710 | if (chan->priv->ctx) { |
b9074a1b MD |
3711 | ret = lttng_metadata_printf(session, |
3712 | " event.context := struct {\n"); | |
3713 | if (ret) | |
3714 | goto end; | |
3715 | } | |
f7d06400 | 3716 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3717 | if (ret) |
3718 | goto end; | |
f7d06400 | 3719 | if (chan->priv->ctx) { |
b9074a1b MD |
3720 | ret = lttng_metadata_printf(session, |
3721 | " };\n"); | |
3722 | if (ret) | |
3723 | goto end; | |
3724 | } | |
8070f5c0 MD |
3725 | |
3726 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3727 | "};\n\n"); |
8070f5c0 | 3728 | |
f7d06400 | 3729 | chan->priv->metadata_dumped = 1; |
c099397a | 3730 | end: |
8b97fd42 | 3731 | lttng_metadata_end(session); |
c099397a MD |
3732 | return ret; |
3733 | } | |
3734 | ||
d83004aa JD |
3735 | /* |
3736 | * Must be called with sessions_mutex held. | |
3737 | */ | |
9115fbdc | 3738 | static |
8cdc1a81 | 3739 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3740 | { |
3741 | return lttng_metadata_printf(session, | |
3742 | "struct packet_context {\n" | |
a3ccff4f MD |
3743 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3744 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3745 | " uint64_t content_size;\n" |
3746 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3747 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3748 | " unsigned long events_discarded;\n" |
9115fbdc | 3749 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3750 | "};\n\n" |
9115fbdc MD |
3751 | ); |
3752 | } | |
3753 | ||
3754 | /* | |
3755 | * Compact header: | |
3756 | * id: range: 0 - 30. | |
3757 | * id 31 is reserved to indicate an extended header. | |
3758 | * | |
3759 | * Large header: | |
3760 | * id: range: 0 - 65534. | |
3761 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3762 | * |
3763 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3764 | */ |
3765 | static | |
8cdc1a81 | 3766 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3767 | { |
3768 | return lttng_metadata_printf(session, | |
3769 | "struct event_header_compact {\n" | |
3770 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3771 | " variant <id> {\n" | |
3772 | " struct {\n" | |
a3ccff4f | 3773 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3774 | " } compact;\n" |
3775 | " struct {\n" | |
3776 | " uint32_t id;\n" | |
a3ccff4f | 3777 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3778 | " } extended;\n" |
3779 | " } v;\n" | |
3780 | "} align(%u);\n" | |
3781 | "\n" | |
3782 | "struct event_header_large {\n" | |
3783 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3784 | " variant <id> {\n" | |
3785 | " struct {\n" | |
a3ccff4f | 3786 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3787 | " } compact;\n" |
3788 | " struct {\n" | |
3789 | " uint32_t id;\n" | |
a3ccff4f | 3790 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3791 | " } extended;\n" |
3792 | " } v;\n" | |
3793 | "} align(%u);\n\n", | |
a90917c3 MD |
3794 | lttng_alignof(uint32_t) * CHAR_BIT, |
3795 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3796 | ); |
3797 | } | |
3798 | ||
a3ccff4f MD |
3799 | /* |
3800 | * Approximation of NTP time of day to clock monotonic correlation, | |
3801 | * taken at start of trace. | |
3802 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3803 | * in future versions. | |
5283350b MD |
3804 | * This function may return a negative offset. It may happen if the |
3805 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3806 | * |
3807 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3808 | * y2038 compliant. | |
a3ccff4f MD |
3809 | */ |
3810 | static | |
8967b2a3 | 3811 | int64_t measure_clock_offset(void) |
a3ccff4f | 3812 | { |
dcb93448 | 3813 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3814 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3815 | int64_t offset; |
a3ccff4f | 3816 | unsigned long flags; |
3636085f MJ |
3817 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3818 | struct timespec64 rts = { 0, 0 }; | |
3819 | #else | |
3820 | struct timespec rts = { 0, 0 }; | |
3821 | #endif | |
a3ccff4f MD |
3822 | |
3823 | /* Disable interrupts to increase correlation precision. */ | |
3824 | local_irq_save(flags); | |
3825 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3826 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3827 | ktime_get_real_ts64(&rts); | |
3828 | #else | |
216b6baa | 3829 | getnstimeofday(&rts); |
3636085f | 3830 | #endif |
a3ccff4f MD |
3831 | monotonic[1] = trace_clock_read64(); |
3832 | local_irq_restore(flags); | |
3833 | ||
dcb93448 | 3834 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3835 | realtime = (uint64_t) rts.tv_sec * tcf; |
3836 | if (tcf == NSEC_PER_SEC) { | |
3837 | realtime += rts.tv_nsec; | |
3838 | } else { | |
3839 | uint64_t n = rts.tv_nsec * tcf; | |
3840 | ||
3841 | do_div(n, NSEC_PER_SEC); | |
3842 | realtime += n; | |
3843 | } | |
dcb93448 | 3844 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3845 | return offset; |
3846 | } | |
3847 | ||
3eb95be4 | 3848 | static |
8cdc1a81 | 3849 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3850 | { |
0f3eaad4 | 3851 | int ret = 0; |
3eb95be4 JR |
3852 | size_t i; |
3853 | char cur; | |
3854 | ||
3855 | i = 0; | |
3856 | cur = string[i]; | |
3857 | while (cur != '\0') { | |
3858 | switch (cur) { | |
3859 | case '\n': | |
3860 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3861 | break; | |
3862 | case '\\': | |
3863 | case '"': | |
3864 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3865 | if (ret) | |
3866 | goto error; | |
3867 | /* We still print the current char */ | |
c190d76e | 3868 | lttng_fallthrough; |
3eb95be4 JR |
3869 | default: |
3870 | ret = lttng_metadata_printf(session, "%c", cur); | |
3871 | break; | |
3872 | } | |
3873 | ||
3874 | if (ret) | |
3875 | goto error; | |
3876 | ||
3877 | cur = string[++i]; | |
3878 | } | |
3879 | error: | |
3880 | return ret; | |
3881 | } | |
3882 | ||
3883 | static | |
8cdc1a81 | 3884 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3885 | const char *field_value) |
3eb95be4 JR |
3886 | { |
3887 | int ret; | |
3888 | ||
1c88f269 | 3889 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3890 | if (ret) |
3891 | goto error; | |
3892 | ||
1c88f269 | 3893 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3894 | if (ret) |
3895 | goto error; | |
3896 | ||
3897 | ret = lttng_metadata_printf(session, "\";\n"); | |
3898 | ||
3899 | error: | |
3900 | return ret; | |
3901 | } | |
3902 | ||
c099397a MD |
3903 | /* |
3904 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3905 | * Must be called with sessions_mutex held. |
c099397a MD |
3906 | */ |
3907 | static | |
8cdc1a81 | 3908 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3909 | { |
8cdc1a81 | 3910 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3911 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3912 | const char *product_uuid; |
f7d06400 | 3913 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3914 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3915 | int ret = 0; |
3916 | ||
585e5dcc | 3917 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3918 | return 0; |
8b97fd42 MD |
3919 | |
3920 | lttng_metadata_begin(session); | |
3921 | ||
8cdc1a81 | 3922 | if (session->priv->metadata_dumped) |
c099397a | 3923 | goto skip_session; |
c099397a | 3924 | |
d793d5e1 | 3925 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3926 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3927 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3928 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3929 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3930 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3931 | |
3932 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3933 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3934 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3935 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3936 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3937 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3938 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3939 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3940 | "\n" |
3941 | "trace {\n" | |
3942 | " major = %u;\n" | |
3943 | " minor = %u;\n" | |
30bdb6e4 | 3944 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3945 | " byte_order = %s;\n" |
3946 | " packet.header := struct {\n" | |
3947 | " uint32_t magic;\n" | |
1ec3f75a | 3948 | " uint8_t uuid[16];\n" |
d793d5e1 | 3949 | " uint32_t stream_id;\n" |
5594698f | 3950 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3951 | " };\n" |
d793d5e1 | 3952 | "};\n\n", |
a90917c3 MD |
3953 | lttng_alignof(uint8_t) * CHAR_BIT, |
3954 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3955 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3956 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3957 | sizeof(unsigned long) * CHAR_BIT, |
3958 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3959 | CTF_SPEC_MAJOR, |
3960 | CTF_SPEC_MINOR, | |
d793d5e1 | 3961 | uuid_s, |
5214fa50 | 3962 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3963 | "be" |
3964 | #else | |
3965 | "le" | |
3966 | #endif | |
3967 | ); | |
3968 | if (ret) | |
3969 | goto end; | |
3970 | ||
99dc9597 MD |
3971 | ret = lttng_metadata_printf(session, |
3972 | "env {\n" | |
a6058143 | 3973 | " hostname = \"%s\";\n" |
c6c9e10f | 3974 | " domain = \"kernel\";\n" |
99dc9597 | 3975 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3976 | " kernel_release = \"%s\";\n" |
3977 | " kernel_version = \"%s\";\n" | |
3978 | " tracer_name = \"lttng-modules\";\n" | |
3979 | " tracer_major = %d;\n" | |
3980 | " tracer_minor = %d;\n" | |
3981 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3982 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3983 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3984 | utsname()->sysname, |
3985 | utsname()->release, | |
c6c9e10f MD |
3986 | utsname()->version, |
3987 | LTTNG_MODULES_MAJOR_VERSION, | |
3988 | LTTNG_MODULES_MINOR_VERSION, | |
3989 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3990 | ); |
3991 | if (ret) | |
3992 | goto end; | |
3993 | ||
8cdc1a81 | 3994 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
3995 | if (ret) |
3996 | goto end; | |
3997 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 3998 | session->priv->creation_time); |
3eb95be4 JR |
3999 | if (ret) |
4000 | goto end; | |
4001 | ||
c88f762e GB |
4002 | /* Add the product UUID to the 'env' section */ |
4003 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4004 | if (product_uuid) { | |
4005 | ret = lttng_metadata_printf(session, | |
4006 | " product_uuid = \"%s\";\n", | |
4007 | product_uuid | |
4008 | ); | |
4009 | if (ret) | |
4010 | goto end; | |
4011 | } | |
4012 | ||
4013 | /* Close the 'env' section */ | |
3eb95be4 JR |
4014 | ret = lttng_metadata_printf(session, "};\n\n"); |
4015 | if (ret) | |
4016 | goto end; | |
4017 | ||
a3ccff4f MD |
4018 | ret = lttng_metadata_printf(session, |
4019 | "clock {\n" | |
2754583e MD |
4020 | " name = \"%s\";\n", |
4021 | trace_clock_name() | |
a82c63f1 MD |
4022 | ); |
4023 | if (ret) | |
4024 | goto end; | |
4025 | ||
4026 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4027 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4028 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4029 | clock_uuid_s |
4030 | ); | |
4031 | if (ret) | |
4032 | goto end; | |
4033 | } | |
4034 | ||
4035 | ret = lttng_metadata_printf(session, | |
2754583e | 4036 | " description = \"%s\";\n" |
a3ccff4f MD |
4037 | " freq = %llu; /* Frequency, in Hz */\n" |
4038 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4039 | " offset = %lld;\n" |
a3ccff4f | 4040 | "};\n\n", |
2754583e | 4041 | trace_clock_description(), |
a3ccff4f | 4042 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4043 | (long long) measure_clock_offset() |
a3ccff4f MD |
4044 | ); |
4045 | if (ret) | |
4046 | goto end; | |
4047 | ||
4048 | ret = lttng_metadata_printf(session, | |
4049 | "typealias integer {\n" | |
4050 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4051 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4052 | "} := uint27_clock_monotonic_t;\n" |
4053 | "\n" | |
4054 | "typealias integer {\n" | |
4055 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4056 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4057 | "} := uint32_clock_monotonic_t;\n" |
4058 | "\n" | |
4059 | "typealias integer {\n" | |
4060 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4061 | " map = clock.%s.value;\n" |
a3ccff4f | 4062 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4063 | trace_clock_name(), |
a3ccff4f | 4064 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4065 | trace_clock_name(), |
4066 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4067 | trace_clock_name() | |
a3ccff4f MD |
4068 | ); |
4069 | if (ret) | |
4070 | goto end; | |
4071 | ||
a90917c3 | 4072 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4073 | if (ret) |
4074 | goto end; | |
4075 | ||
a90917c3 | 4076 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4077 | if (ret) |
4078 | goto end; | |
4079 | ||
c099397a | 4080 | skip_session: |
f7d06400 MD |
4081 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4082 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4083 | if (ret) |
4084 | goto end; | |
4085 | } | |
4086 | ||
8cdc1a81 | 4087 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4088 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4089 | event_recorder_priv->pub); | |
c099397a MD |
4090 | if (ret) |
4091 | goto end; | |
4092 | } | |
8cdc1a81 | 4093 | session->priv->metadata_dumped = 1; |
c099397a | 4094 | end: |
8b97fd42 | 4095 | lttng_metadata_end(session); |
c099397a MD |
4096 | return ret; |
4097 | } | |
4098 | ||
c0e31d2e | 4099 | /** |
a90917c3 | 4100 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4101 | * @transport: transport structure |
4102 | * | |
4103 | * Registers a transport which can be used as output to extract the data out of | |
4104 | * LTTng. The module calling this registration function must ensure that no | |
4105 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4106 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4107 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4108 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4109 | * after its registration must it synchronize the TLBs. |
4110 | */ | |
a90917c3 | 4111 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4112 | { |
4113 | /* | |
4114 | * Make sure no page fault can be triggered by the module about to be | |
4115 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4116 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4117 | */ |
263b6c88 | 4118 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4119 | |
4120 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4121 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4122 | mutex_unlock(&sessions_mutex); |
4123 | } | |
a90917c3 | 4124 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4125 | |
4126 | /** | |
a90917c3 | 4127 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4128 | * @transport: transport structure |
4129 | */ | |
a90917c3 | 4130 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4131 | { |
4132 | mutex_lock(&sessions_mutex); | |
4133 | list_del(&transport->node); | |
4134 | mutex_unlock(&sessions_mutex); | |
4135 | } | |
a90917c3 | 4136 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4137 | |
a101fa10 MD |
4138 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4139 | { | |
4140 | /* | |
4141 | * Make sure no page fault can be triggered by the module about to be | |
4142 | * registered. We deal with this here so we don't have to call | |
4143 | * vmalloc_sync_mappings() in each module's init. | |
4144 | */ | |
4145 | wrapper_vmalloc_sync_mappings(); | |
4146 | ||
4147 | mutex_lock(&sessions_mutex); | |
4148 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4149 | mutex_unlock(&sessions_mutex); | |
4150 | } | |
4151 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4152 | ||
4153 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4154 | { | |
4155 | mutex_lock(&sessions_mutex); | |
4156 | list_del(&transport->node); | |
4157 | mutex_unlock(&sessions_mutex); | |
4158 | } | |
4159 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4160 | ||
5f4c791e | 4161 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4162 | |
4163 | enum cpuhp_state lttng_hp_prepare; | |
4164 | enum cpuhp_state lttng_hp_online; | |
4165 | ||
4166 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4167 | { | |
4168 | struct lttng_cpuhp_node *lttng_node; | |
4169 | ||
4170 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4171 | switch (lttng_node->component) { | |
4172 | case LTTNG_RING_BUFFER_FRONTEND: | |
4173 | return 0; | |
4174 | case LTTNG_RING_BUFFER_BACKEND: | |
4175 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4176 | case LTTNG_RING_BUFFER_ITER: | |
4177 | return 0; | |
4178 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4179 | return 0; | |
4180 | default: | |
4181 | return -EINVAL; | |
4182 | } | |
4183 | } | |
4184 | ||
4185 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4186 | { | |
4187 | struct lttng_cpuhp_node *lttng_node; | |
4188 | ||
4189 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4190 | switch (lttng_node->component) { | |
4191 | case LTTNG_RING_BUFFER_FRONTEND: | |
4192 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4193 | case LTTNG_RING_BUFFER_BACKEND: | |
4194 | return 0; | |
4195 | case LTTNG_RING_BUFFER_ITER: | |
4196 | return 0; | |
4197 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4198 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4199 | default: | |
4200 | return -EINVAL; | |
4201 | } | |
4202 | } | |
4203 | ||
4204 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4205 | { | |
4206 | struct lttng_cpuhp_node *lttng_node; | |
4207 | ||
4208 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4209 | switch (lttng_node->component) { | |
4210 | case LTTNG_RING_BUFFER_FRONTEND: | |
4211 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4212 | case LTTNG_RING_BUFFER_BACKEND: | |
4213 | return 0; | |
4214 | case LTTNG_RING_BUFFER_ITER: | |
4215 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4216 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4217 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4218 | default: | |
4219 | return -EINVAL; | |
4220 | } | |
4221 | } | |
4222 | ||
4223 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4224 | { | |
4225 | struct lttng_cpuhp_node *lttng_node; | |
4226 | ||
4227 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4228 | switch (lttng_node->component) { | |
4229 | case LTTNG_RING_BUFFER_FRONTEND: | |
4230 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4231 | case LTTNG_RING_BUFFER_BACKEND: | |
4232 | return 0; | |
4233 | case LTTNG_RING_BUFFER_ITER: | |
4234 | return 0; | |
4235 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4236 | return 0; | |
4237 | default: | |
4238 | return -EINVAL; | |
4239 | } | |
4240 | } | |
4241 | ||
4242 | static int __init lttng_init_cpu_hotplug(void) | |
4243 | { | |
4244 | int ret; | |
4245 | ||
4246 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4247 | lttng_hotplug_prepare, | |
4248 | lttng_hotplug_dead); | |
4249 | if (ret < 0) { | |
4250 | return ret; | |
4251 | } | |
4252 | lttng_hp_prepare = ret; | |
4253 | lttng_rb_set_hp_prepare(ret); | |
4254 | ||
4255 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4256 | lttng_hotplug_online, | |
4257 | lttng_hotplug_offline); | |
4258 | if (ret < 0) { | |
4259 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4260 | lttng_hp_prepare = 0; | |
4261 | return ret; | |
4262 | } | |
4263 | lttng_hp_online = ret; | |
4264 | lttng_rb_set_hp_online(ret); | |
4265 | ||
4266 | return 0; | |
4267 | } | |
4268 | ||
4269 | static void __exit lttng_exit_cpu_hotplug(void) | |
4270 | { | |
4271 | lttng_rb_set_hp_online(0); | |
4272 | cpuhp_remove_multi_state(lttng_hp_online); | |
4273 | lttng_rb_set_hp_prepare(0); | |
4274 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4275 | } | |
4276 | ||
5f4c791e | 4277 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4278 | static int lttng_init_cpu_hotplug(void) |
4279 | { | |
4280 | return 0; | |
4281 | } | |
4282 | static void lttng_exit_cpu_hotplug(void) | |
4283 | { | |
4284 | } | |
5f4c791e | 4285 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4286 | |
a90917c3 | 4287 | static int __init lttng_events_init(void) |
4e3c1b9b | 4288 | { |
1c25284c MD |
4289 | int ret; |
4290 | ||
453b2495 JD |
4291 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4292 | if (ret) | |
4293 | return ret; | |
389d7070 | 4294 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4295 | if (ret) |
4296 | return ret; | |
4297 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4298 | if (ret) |
4299 | return ret; | |
4300 | ret = lttng_probes_init(); | |
389d7070 MD |
4301 | if (ret) |
4302 | return ret; | |
07dfc1d0 | 4303 | ret = lttng_context_init(); |
20591cf7 MD |
4304 | if (ret) |
4305 | return ret; | |
07dfc1d0 MD |
4306 | ret = lttng_tracepoint_init(); |
4307 | if (ret) | |
4308 | goto error_tp; | |
a67ba386 MD |
4309 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4310 | if (!event_recorder_cache) { | |
20591cf7 | 4311 | ret = -ENOMEM; |
a67ba386 | 4312 | goto error_kmem_event_recorder; |
dffef45d | 4313 | } |
a67ba386 MD |
4314 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4315 | if (!event_recorder_private_cache) { | |
4316 | ret = -ENOMEM; | |
4317 | goto error_kmem_event_recorder_private; | |
4318 | } | |
4319 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4320 | if (!event_notifier_cache) { |
4321 | ret = -ENOMEM; | |
4322 | goto error_kmem_event_notifier; | |
20591cf7 | 4323 | } |
a67ba386 MD |
4324 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4325 | if (!event_notifier_private_cache) { | |
4326 | ret = -ENOMEM; | |
4327 | goto error_kmem_event_notifier_private; | |
4328 | } | |
80996790 | 4329 | ret = lttng_abi_init(); |
02119ee5 MD |
4330 | if (ret) |
4331 | goto error_abi; | |
0c956676 MD |
4332 | ret = lttng_logger_init(); |
4333 | if (ret) | |
4334 | goto error_logger; | |
1e367326 MD |
4335 | ret = lttng_init_cpu_hotplug(); |
4336 | if (ret) | |
4337 | goto error_hotplug; | |
101215b7 | 4338 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4339 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4340 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4341 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4342 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4343 | LTTNG_VERSION_NAME, |
4344 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4345 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4346 | #else | |
4347 | "", | |
4348 | #endif | |
4349 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4350 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4351 | #else | |
4352 | ""); | |
4353 | #endif | |
c1551e57 MJ |
4354 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4355 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4356 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4357 | return 0; |
0c956676 | 4358 | |
1e367326 MD |
4359 | error_hotplug: |
4360 | lttng_logger_exit(); | |
0c956676 MD |
4361 | error_logger: |
4362 | lttng_abi_exit(); | |
02119ee5 | 4363 | error_abi: |
a67ba386 MD |
4364 | kmem_cache_destroy(event_notifier_private_cache); |
4365 | error_kmem_event_notifier_private: | |
dffef45d FD |
4366 | kmem_cache_destroy(event_notifier_cache); |
4367 | error_kmem_event_notifier: | |
a67ba386 MD |
4368 | kmem_cache_destroy(event_recorder_private_cache); |
4369 | error_kmem_event_recorder_private: | |
4370 | kmem_cache_destroy(event_recorder_cache); | |
4371 | error_kmem_event_recorder: | |
20591cf7 | 4372 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4373 | error_tp: |
4374 | lttng_context_exit(); | |
101215b7 | 4375 | printk(KERN_NOTICE "LTTng: Failed to load 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 | |
1c25284c | 4391 | return ret; |
4e3c1b9b MD |
4392 | } |
4393 | ||
a90917c3 | 4394 | module_init(lttng_events_init); |
11b5a3c2 | 4395 | |
a90917c3 | 4396 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4397 | { |
8cdc1a81 | 4398 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4399 | |
1e367326 | 4400 | lttng_exit_cpu_hotplug(); |
0c956676 | 4401 | lttng_logger_exit(); |
80996790 | 4402 | lttng_abi_exit(); |
8cdc1a81 MD |
4403 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4404 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4405 | kmem_cache_destroy(event_recorder_cache); |
4406 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4407 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4408 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4409 | lttng_tracepoint_exit(); |
07dfc1d0 | 4410 | lttng_context_exit(); |
101215b7 | 4411 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4412 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4413 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4414 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4415 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4416 | LTTNG_VERSION_NAME, |
4417 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4418 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4419 | #else | |
4420 | "", | |
4421 | #endif | |
4422 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4423 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4424 | #else | |
4425 | ""); | |
4426 | #endif | |
4e3c1b9b | 4427 | } |
92e94819 | 4428 | |
a90917c3 | 4429 | module_exit(lttng_events_exit); |
11b5a3c2 | 4430 | |
7ca11e77 | 4431 | #include <generated/patches.h> |
101215b7 MJ |
4432 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4433 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4434 | #endif | |
4435 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4436 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4437 | #endif | |
92e94819 MD |
4438 | MODULE_LICENSE("GPL and additional rights"); |
4439 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4440 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4441 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4442 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4443 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4444 | LTTNG_MODULES_EXTRAVERSION); |