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 | { |
def1e304 | 878 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
5b9817ae | 879 | struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param; |
def1e304 | 880 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; |
f7d06400 | 881 | struct lttng_kernel_session *session = chan->parent.session; |
a67ba386 MD |
882 | struct lttng_kernel_event_recorder *event_recorder; |
883 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
3c997079 MD |
884 | const char *event_name; |
885 | struct hlist_head *head; | |
3d084699 | 886 | int ret; |
4e3c1b9b | 887 | |
f7d06400 | 888 | if (chan->priv->free_event_id == -1U) { |
4cf0bf51 | 889 | ret = -EMFILE; |
e5382b6d | 890 | goto full; |
abc0446a | 891 | } |
3c997079 MD |
892 | |
893 | switch (itype) { | |
606828e4 | 894 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 895 | event_name = event_desc->event_name; |
3c997079 | 896 | break; |
b4a75708 | 897 | |
c190d76e MJ |
898 | case LTTNG_KERNEL_ABI_KPROBE: |
899 | lttng_fallthrough; | |
900 | case LTTNG_KERNEL_ABI_UPROBE: | |
901 | lttng_fallthrough; | |
902 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
903 | lttng_fallthrough; | |
606828e4 | 904 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
905 | event_name = event_param->name; |
906 | break; | |
b4a75708 | 907 | |
c190d76e MJ |
908 | case LTTNG_KERNEL_ABI_FUNCTION: |
909 | lttng_fallthrough; | |
910 | case LTTNG_KERNEL_ABI_NOOP: | |
911 | lttng_fallthrough; | |
3c997079 MD |
912 | default: |
913 | WARN_ON_ONCE(1); | |
914 | ret = -EINVAL; | |
915 | goto type_error; | |
916 | } | |
4a11ef1c | 917 | |
8cdc1a81 | 918 | head = utils_borrow_hash_table_bucket(session->priv->events_ht.table, |
4a11ef1c | 919 | LTTNG_EVENT_HT_SIZE, event_name); |
a67ba386 MD |
920 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
921 | WARN_ON_ONCE(!event_recorder_priv->parent.desc); | |
922 | if (!strncmp(event_recorder_priv->parent.desc->event_name, event_name, | |
606828e4 | 923 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 924 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
925 | ret = -EEXIST; |
926 | goto exist; | |
abc0446a MD |
927 | } |
928 | } | |
3c997079 | 929 | |
a67ba386 MD |
930 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
931 | if (!event_recorder) { | |
4cf0bf51 | 932 | ret = -ENOMEM; |
4e3c1b9b | 933 | goto cache_error; |
abc0446a | 934 | } |
a67ba386 MD |
935 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
936 | if (!event_recorder_priv) { | |
937 | ret = -ENOMEM; | |
938 | goto cache_private_error; | |
939 | } | |
940 | event_recorder_priv->pub = event_recorder; | |
941 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
942 | event_recorder->priv = event_recorder_priv; | |
943 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
944 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
945 | ||
8a445457 | 946 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 947 | event_recorder->chan = chan; |
f7d06400 | 948 | event_recorder->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
949 | event_recorder->priv->parent.instrumentation = itype; |
950 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
951 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
952 | |
953 | switch (itype) { | |
606828e4 | 954 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 955 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
956 | event_recorder->parent.enabled = 0; |
957 | event_recorder->priv->parent.registered = 0; | |
958 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
959 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 960 | ret = -ENOENT; |
d3dbe23c | 961 | goto register_error; |
abc0446a | 962 | } |
3c997079 MD |
963 | /* Populate lttng_event structure before event registration. */ |
964 | smp_wmb(); | |
baf20995 | 965 | break; |
b4a75708 | 966 | |
606828e4 | 967 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
968 | /* |
969 | * Needs to be explicitly enabled after creation, since | |
970 | * we may want to apply filters. | |
971 | */ | |
a67ba386 MD |
972 | event_recorder->parent.enabled = 0; |
973 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
974 | /* |
975 | * Populate lttng_event structure before event | |
976 | * registration. | |
977 | */ | |
978 | smp_wmb(); | |
8bf17deb | 979 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
980 | event_param->u.kprobe.symbol_name, |
981 | event_param->u.kprobe.offset, | |
982 | event_param->u.kprobe.addr, | |
6a35e5bd | 983 | &event_recorder->parent); |
abc0446a | 984 | if (ret) { |
4cf0bf51 | 985 | ret = -EINVAL; |
d6d808f3 | 986 | goto register_error; |
abc0446a | 987 | } |
a67ba386 | 988 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 989 | WARN_ON_ONCE(!ret); |
d6d808f3 | 990 | break; |
b4a75708 | 991 | |
606828e4 | 992 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 993 | { |
a67ba386 MD |
994 | struct lttng_kernel_event_recorder *event_recorder_return; |
995 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
996 | |
997 | /* kretprobe defines 2 events */ | |
a0493bef MD |
998 | /* |
999 | * Needs to be explicitly enabled after creation, since | |
1000 | * we may want to apply filters. | |
1001 | */ | |
a67ba386 MD |
1002 | event_recorder->parent.enabled = 0; |
1003 | event_recorder->priv->parent.registered = 1; | |
1004 | ||
1005 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
1006 | if (!event_recorder_return) { | |
1007 | ret = -ENOMEM; | |
1008 | goto register_error; | |
1009 | } | |
1010 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
1011 | if (!event_recorder_return_priv) { | |
1012 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1013 | ret = -ENOMEM; |
7371f44c | 1014 | goto register_error; |
abc0446a | 1015 | } |
a67ba386 MD |
1016 | event_recorder_return_priv->pub = event_recorder_return; |
1017 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
1018 | event_recorder_return->priv = event_recorder_return_priv; | |
1019 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
1020 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
1021 | ||
8a445457 | 1022 | event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 1023 | event_recorder_return->chan = chan; |
f7d06400 | 1024 | event_recorder_return->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
1025 | event_recorder_return->priv->parent.instrumentation = itype; |
1026 | event_recorder_return->parent.enabled = 0; | |
1027 | event_recorder_return->priv->parent.registered = 1; | |
1028 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
1029 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 1030 | /* |
a90917c3 | 1031 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1032 | */ |
1033 | smp_wmb(); | |
3c997079 | 1034 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1035 | event_param->u.kretprobe.symbol_name, |
1036 | event_param->u.kretprobe.offset, | |
1037 | event_param->u.kretprobe.addr, | |
eb6b47db | 1038 | &event_recorder->parent, &event_recorder_return->parent); |
7371f44c | 1039 | if (ret) { |
a67ba386 MD |
1040 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1041 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1042 | ret = -EINVAL; |
7371f44c MD |
1043 | goto register_error; |
1044 | } | |
1045 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1046 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1047 | WARN_ON_ONCE(!ret); |
a67ba386 | 1048 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1049 | WARN_ON_ONCE(!ret); |
f7d06400 | 1050 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, |
a67ba386 | 1051 | event_recorder_return); |
abc0446a | 1052 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1053 | if (ret) { |
a67ba386 MD |
1054 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1055 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
1056 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1057 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1058 | goto statedump_error; |
1059 | } | |
f7d06400 | 1060 | list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events); |
7371f44c MD |
1061 | break; |
1062 | } | |
b4a75708 | 1063 | |
606828e4 | 1064 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1065 | /* |
1066 | * Needs to be explicitly enabled after creation, since | |
1067 | * we may want to apply filters. | |
1068 | */ | |
a67ba386 MD |
1069 | event_recorder->parent.enabled = 0; |
1070 | event_recorder->priv->parent.registered = 0; | |
1071 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1072 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1073 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1074 | ret = -EINVAL; |
1075 | goto register_error; | |
606828e4 | 1076 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1077 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1078 | break; |
606828e4 | 1079 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1080 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1081 | break; |
1082 | } | |
1083 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1084 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1085 | ret = -EINVAL; |
1086 | goto register_error; | |
606828e4 | 1087 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1088 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1089 | break; |
606828e4 | 1090 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1091 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1092 | break; |
1093 | } | |
a67ba386 | 1094 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1095 | ret = -EINVAL; |
259b6cb3 | 1096 | goto register_error; |
abc0446a | 1097 | } |
1ec65de1 | 1098 | break; |
b4a75708 | 1099 | |
606828e4 | 1100 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1101 | /* |
1102 | * Needs to be explicitly enabled after creation, since | |
1103 | * we may want to apply filters. | |
1104 | */ | |
a67ba386 MD |
1105 | event_recorder->parent.enabled = 0; |
1106 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1107 | |
a344f64b FD |
1108 | /* |
1109 | * Populate lttng_event structure before event | |
1110 | * registration. | |
1111 | */ | |
1112 | smp_wmb(); | |
149b9a9d | 1113 | |
83b802dc | 1114 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1115 | event_param->u.uprobe.fd, |
17806c46 | 1116 | &event_recorder->parent); |
149b9a9d YB |
1117 | if (ret) |
1118 | goto register_error; | |
a67ba386 | 1119 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1120 | WARN_ON_ONCE(!ret); |
1121 | break; | |
b4a75708 | 1122 | |
c190d76e MJ |
1123 | case LTTNG_KERNEL_ABI_FUNCTION: |
1124 | lttng_fallthrough; | |
1125 | case LTTNG_KERNEL_ABI_NOOP: | |
1126 | lttng_fallthrough; | |
baf20995 MD |
1127 | default: |
1128 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1129 | ret = -EINVAL; |
df07930b | 1130 | goto register_error; |
baf20995 | 1131 | } |
f7d06400 | 1132 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder); |
abc0446a MD |
1133 | WARN_ON_ONCE(ret > 0); |
1134 | if (ret) { | |
c099397a | 1135 | goto statedump_error; |
abc0446a | 1136 | } |
a67ba386 | 1137 | hlist_add_head(&event_recorder->priv->hlist, head); |
f7d06400 | 1138 | list_add(&event_recorder->priv->node, &chan->parent.session->priv->events); |
a67ba386 | 1139 | return event_recorder; |
4e3c1b9b | 1140 | |
c099397a | 1141 | statedump_error: |
259b6cb3 | 1142 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1143 | register_error: |
a67ba386 MD |
1144 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1145 | cache_private_error: | |
1146 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1147 | cache_error: |
1148 | exist: | |
3c997079 | 1149 | type_error: |
e5382b6d | 1150 | full: |
4cf0bf51 | 1151 | return ERR_PTR(ret); |
4e3c1b9b MD |
1152 | } |
1153 | ||
a67ba386 | 1154 | struct lttng_kernel_event_notifier *_lttng_event_notifier_create( |
437d5aa5 | 1155 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1156 | uint64_t token, uint64_t error_counter_index, |
1157 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1158 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1159 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1160 | { |
a67ba386 MD |
1161 | struct lttng_kernel_event_notifier *event_notifier; |
1162 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
ab04d7b1 | 1163 | struct lttng_counter *error_counter; |
dffef45d FD |
1164 | const char *event_name; |
1165 | struct hlist_head *head; | |
1166 | int ret; | |
1167 | ||
1168 | switch (itype) { | |
606828e4 | 1169 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1170 | event_name = event_desc->event_name; |
b01155ba | 1171 | break; |
b4a75708 | 1172 | |
c190d76e MJ |
1173 | case LTTNG_KERNEL_ABI_KPROBE: |
1174 | lttng_fallthrough; | |
1175 | case LTTNG_KERNEL_ABI_UPROBE: | |
1176 | lttng_fallthrough; | |
606828e4 | 1177 | case LTTNG_KERNEL_ABI_SYSCALL: |
2b16f0c9 FD |
1178 | event_name = event_notifier_param->event.name; |
1179 | break; | |
b4a75708 | 1180 | |
c190d76e MJ |
1181 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1182 | lttng_fallthrough; | |
1183 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1184 | lttng_fallthrough; | |
1185 | case LTTNG_KERNEL_ABI_NOOP: | |
1186 | lttng_fallthrough; | |
dffef45d FD |
1187 | default: |
1188 | WARN_ON_ONCE(1); | |
1189 | ret = -EINVAL; | |
1190 | goto type_error; | |
1191 | } | |
1192 | ||
33af697f MD |
1193 | head = utils_borrow_hash_table_bucket(event_notifier_group->events_ht.table, |
1194 | LTTNG_EVENT_HT_SIZE, event_name); | |
a67ba386 MD |
1195 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1196 | WARN_ON_ONCE(!event_notifier_priv->parent.desc); | |
1197 | if (!strncmp(event_notifier_priv->parent.desc->event_name, event_name, | |
606828e4 | 1198 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 MD |
1199 | && event_notifier_group == event_notifier_priv->group |
1200 | && token == event_notifier_priv->parent.user_token) { | |
dffef45d FD |
1201 | ret = -EEXIST; |
1202 | goto exist; | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1207 | if (!event_notifier) { | |
1208 | ret = -ENOMEM; | |
1209 | goto cache_error; | |
1210 | } | |
a67ba386 MD |
1211 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1212 | if (!event_notifier_priv) { | |
1213 | ret = -ENOMEM; | |
1214 | goto cache_private_error; | |
1215 | } | |
1216 | event_notifier_priv->pub = event_notifier; | |
1217 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1218 | event_notifier->priv = event_notifier_priv; | |
1219 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1220 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1221 | ||
1222 | event_notifier->priv->group = event_notifier_group; | |
1223 | event_notifier->priv->parent.user_token = token; | |
1224 | event_notifier->priv->error_counter_index = error_counter_index; | |
1225 | event_notifier->priv->num_captures = 0; | |
1226 | event_notifier->priv->parent.instrumentation = itype; | |
1227 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1228 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1229 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1230 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
8a445457 | 1231 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; |
dffef45d FD |
1232 | |
1233 | switch (itype) { | |
606828e4 | 1234 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1235 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1236 | event_notifier->parent.enabled = 0; |
1237 | event_notifier->priv->parent.registered = 0; | |
1238 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1239 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1240 | ret = -ENOENT; |
1241 | goto register_error; | |
1242 | } | |
1243 | /* Populate lttng_event_notifier structure before event registration. */ | |
1244 | smp_wmb(); | |
1245 | break; | |
b4a75708 | 1246 | |
606828e4 | 1247 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1248 | /* |
1249 | * Needs to be explicitly enabled after creation, since | |
1250 | * we may want to apply filters. | |
1251 | */ | |
a67ba386 MD |
1252 | event_notifier->parent.enabled = 0; |
1253 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1254 | /* |
1255 | * Populate lttng_event_notifier structure before event | |
1256 | * registration. | |
1257 | */ | |
1258 | smp_wmb(); | |
6a35e5bd | 1259 | ret = lttng_kprobes_register_event(event_notifier_param->event.u.kprobe.symbol_name, |
2b16f0c9 FD |
1260 | event_notifier_param->event.u.kprobe.symbol_name, |
1261 | event_notifier_param->event.u.kprobe.offset, | |
1262 | event_notifier_param->event.u.kprobe.addr, | |
6a35e5bd | 1263 | &event_notifier->parent); |
2b16f0c9 FD |
1264 | if (ret) { |
1265 | ret = -EINVAL; | |
1266 | goto register_error; | |
1267 | } | |
a67ba386 | 1268 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1269 | WARN_ON_ONCE(!ret); |
1270 | break; | |
b4a75708 | 1271 | |
606828e4 | 1272 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1273 | /* |
1274 | * Needs to be explicitly enabled after creation, since | |
1275 | * we may want to apply filters. | |
1276 | */ | |
a67ba386 MD |
1277 | event_notifier->parent.enabled = 0; |
1278 | event_notifier->priv->parent.registered = 0; | |
1279 | event_notifier->priv->parent.desc = event_desc; | |
8a8ac9a8 | 1280 | switch (event_notifier_param->event.u.syscall.entryexit) { |
606828e4 | 1281 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1282 | ret = -EINVAL; |
1283 | goto register_error; | |
606828e4 | 1284 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1285 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1286 | break; |
606828e4 | 1287 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1288 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1289 | break; |
1290 | } | |
1291 | switch (event_notifier_param->event.u.syscall.abi) { | |
606828e4 | 1292 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1293 | ret = -EINVAL; |
1294 | goto register_error; | |
606828e4 | 1295 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1296 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1297 | break; |
606828e4 | 1298 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1299 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1300 | break; |
1301 | } | |
1302 | ||
a67ba386 | 1303 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1304 | ret = -EINVAL; |
1305 | goto register_error; | |
1306 | } | |
1307 | break; | |
b4a75708 | 1308 | |
606828e4 | 1309 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1310 | /* |
1311 | * Needs to be explicitly enabled after creation, since | |
1312 | * we may want to apply filters. | |
1313 | */ | |
a67ba386 MD |
1314 | event_notifier->parent.enabled = 0; |
1315 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1316 | |
1317 | /* | |
1318 | * Populate lttng_event_notifier structure before | |
1319 | * event_notifier registration. | |
1320 | */ | |
1321 | smp_wmb(); | |
1322 | ||
17806c46 | 1323 | ret = lttng_uprobes_register_event(event_notifier_param->event.name, |
9de67196 | 1324 | event_notifier_param->event.u.uprobe.fd, |
17806c46 | 1325 | &event_notifier->parent); |
9de67196 FD |
1326 | if (ret) |
1327 | goto register_error; | |
a67ba386 | 1328 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1329 | WARN_ON_ONCE(!ret); |
1330 | break; | |
b4a75708 | 1331 | |
c190d76e MJ |
1332 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1333 | lttng_fallthrough; | |
1334 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1335 | lttng_fallthrough; | |
1336 | case LTTNG_KERNEL_ABI_NOOP: | |
1337 | lttng_fallthrough; | |
dffef45d FD |
1338 | default: |
1339 | WARN_ON_ONCE(1); | |
1340 | ret = -EINVAL; | |
1341 | goto register_error; | |
1342 | } | |
1343 | ||
a67ba386 MD |
1344 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
1345 | hlist_add_head(&event_notifier->priv->hlist, head); | |
99f52fcc FD |
1346 | |
1347 | /* | |
1348 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1349 | * bucket is currently in use. We trust it. The session lock |
1350 | * synchronizes against concurrent creation of the error | |
1351 | * counter. | |
99f52fcc | 1352 | */ |
ab04d7b1 MD |
1353 | error_counter = event_notifier_group->error_counter; |
1354 | if (error_counter) { | |
99f52fcc FD |
1355 | size_t dimension_index[1]; |
1356 | ||
1357 | /* | |
1358 | * Check that the index is within the boundary of the counter. | |
1359 | */ | |
a67ba386 | 1360 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1361 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1362 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1363 | ret = -EINVAL; |
1364 | goto register_error; | |
1365 | } | |
1366 | ||
a67ba386 | 1367 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1368 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1369 | if (ret) { |
1370 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1371 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1372 | goto register_error; |
1373 | } | |
1374 | } | |
1375 | ||
dffef45d FD |
1376 | return event_notifier; |
1377 | ||
1378 | register_error: | |
a67ba386 MD |
1379 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1380 | cache_private_error: | |
dffef45d FD |
1381 | kmem_cache_free(event_notifier_cache, event_notifier); |
1382 | cache_error: | |
1383 | exist: | |
1384 | type_error: | |
1385 | return ERR_PTR(ret); | |
1386 | } | |
1387 | ||
99f52fcc FD |
1388 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1389 | const size_t *dim_indexes, int32_t cpu, | |
1390 | int64_t *val, bool *overflow, bool *underflow) | |
1391 | { | |
1392 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1393 | cpu, val, overflow, underflow); | |
1394 | } | |
1395 | ||
1396 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1397 | const size_t *dim_indexes, int64_t *val, | |
1398 | bool *overflow, bool *underflow) | |
1399 | { | |
1400 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1401 | val, overflow, underflow); | |
1402 | } | |
1403 | ||
1404 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1405 | const size_t *dim_indexes) | |
1406 | { | |
1407 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1408 | } | |
1409 | ||
1ae083ba | 1410 | struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler, |
def1e304 | 1411 | const struct lttng_kernel_event_desc *event_desc) |
3c997079 | 1412 | { |
a67ba386 | 1413 | struct lttng_kernel_event_recorder *event; |
3c997079 MD |
1414 | |
1415 | mutex_lock(&sessions_mutex); | |
def1e304 | 1416 | event = _lttng_kernel_event_recorder_create(event_enabler, event_desc); |
3c997079 MD |
1417 | mutex_unlock(&sessions_mutex); |
1418 | return event; | |
1419 | } | |
1420 | ||
a67ba386 | 1421 | struct lttng_kernel_event_notifier *lttng_event_notifier_create( |
437d5aa5 | 1422 | const struct lttng_kernel_event_desc *event_desc, |
99f52fcc FD |
1423 | uint64_t id, uint64_t error_counter_index, |
1424 | struct lttng_event_notifier_group *event_notifier_group, | |
606828e4 | 1425 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
a67ba386 | 1426 | enum lttng_kernel_abi_instrumentation itype) |
dffef45d | 1427 | { |
a67ba386 | 1428 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1429 | |
1430 | mutex_lock(&sessions_mutex); | |
1431 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
99f52fcc | 1432 | error_counter_index, event_notifier_group, |
a67ba386 | 1433 | event_notifier_param, itype); |
dffef45d FD |
1434 | mutex_unlock(&sessions_mutex); |
1435 | return event_notifier; | |
1436 | } | |
1437 | ||
3c997079 MD |
1438 | /* Only used for tracepoints for now. */ |
1439 | static | |
0c851fa0 | 1440 | void register_event(struct lttng_kernel_event_common *event) |
3c997079 | 1441 | { |
437d5aa5 | 1442 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1443 | int ret = -EINVAL; |
3c997079 | 1444 | |
0c851fa0 | 1445 | if (event->priv->registered) |
3c997079 | 1446 | return; |
4ecb5ad5 | 1447 | |
0c851fa0 MD |
1448 | desc = event->priv->desc; |
1449 | switch (event->priv->instrumentation) { | |
606828e4 | 1450 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1451 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1452 | desc->tp_class->probe_callback, |
0c851fa0 | 1453 | event); |
4ecb5ad5 | 1454 | break; |
b4a75708 | 1455 | |
606828e4 | 1456 | case LTTNG_KERNEL_ABI_SYSCALL: |
0c851fa0 | 1457 | ret = lttng_syscall_filter_enable_event(event); |
4ecb5ad5 | 1458 | break; |
b4a75708 | 1459 | |
c190d76e MJ |
1460 | case LTTNG_KERNEL_ABI_KPROBE: |
1461 | lttng_fallthrough; | |
1462 | case LTTNG_KERNEL_ABI_UPROBE: | |
4ecb5ad5 | 1463 | ret = 0; |
f0bcc14c | 1464 | break; |
0c851fa0 MD |
1465 | |
1466 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1467 | switch (event->type) { | |
1468 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1469 | ret = 0; | |
1470 | break; | |
1471 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1472 | WARN_ON_ONCE(1); | |
1473 | break; | |
1474 | } | |
4ecb5ad5 | 1475 | break; |
b4a75708 | 1476 | |
c190d76e MJ |
1477 | case LTTNG_KERNEL_ABI_FUNCTION: |
1478 | lttng_fallthrough; | |
1479 | case LTTNG_KERNEL_ABI_NOOP: | |
1480 | lttng_fallthrough; | |
4ecb5ad5 MD |
1481 | default: |
1482 | WARN_ON_ONCE(1); | |
1483 | } | |
3c997079 | 1484 | if (!ret) |
0c851fa0 | 1485 | event->priv->registered = 1; |
3c997079 MD |
1486 | } |
1487 | ||
f0bcc14c | 1488 | int _lttng_event_unregister(struct lttng_kernel_event_common *event) |
4e3c1b9b | 1489 | { |
f0bcc14c | 1490 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
437d5aa5 | 1491 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1492 | int ret = -EINVAL; |
1493 | ||
a67ba386 | 1494 | if (!event_priv->registered) |
3c997079 MD |
1495 | return 0; |
1496 | ||
a67ba386 MD |
1497 | desc = event_priv->desc; |
1498 | switch (event_priv->instrumentation) { | |
606828e4 | 1499 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1500 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1501 | event_priv->desc->tp_class->probe_callback, |
f0bcc14c | 1502 | event); |
baf20995 | 1503 | break; |
b4a75708 | 1504 | |
606828e4 | 1505 | case LTTNG_KERNEL_ABI_KPROBE: |
f0bcc14c | 1506 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1507 | ret = 0; |
1508 | break; | |
b4a75708 | 1509 | |
606828e4 | 1510 | case LTTNG_KERNEL_ABI_KRETPROBE: |
f0bcc14c MD |
1511 | switch (event->type) { |
1512 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1513 | lttng_kretprobes_unregister(event); | |
1514 | ret = 0; | |
1515 | break; | |
1516 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1517 | WARN_ON_ONCE(1); | |
1518 | break; | |
1519 | } | |
7371f44c | 1520 | break; |
b4a75708 | 1521 | |
606828e4 | 1522 | case LTTNG_KERNEL_ABI_SYSCALL: |
f0bcc14c | 1523 | ret = lttng_syscall_filter_disable_event(event); |
4ecb5ad5 | 1524 | break; |
b4a75708 | 1525 | |
606828e4 | 1526 | case LTTNG_KERNEL_ABI_NOOP: |
f0bcc14c MD |
1527 | switch (event->type) { |
1528 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1529 | ret = 0; | |
1530 | break; | |
1531 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1532 | WARN_ON_ONCE(1); | |
1533 | break; | |
1534 | } | |
259b6cb3 | 1535 | break; |
b4a75708 | 1536 | |
606828e4 | 1537 | case LTTNG_KERNEL_ABI_UPROBE: |
f0bcc14c | 1538 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1539 | ret = 0; |
1540 | break; | |
b4a75708 | 1541 | |
c190d76e MJ |
1542 | case LTTNG_KERNEL_ABI_FUNCTION: |
1543 | lttng_fallthrough; | |
baf20995 MD |
1544 | default: |
1545 | WARN_ON_ONCE(1); | |
1546 | } | |
3c997079 | 1547 | if (!ret) |
a67ba386 | 1548 | event_priv->registered = 0; |
dda6a249 MD |
1549 | return ret; |
1550 | } | |
1551 | ||
1552 | /* | |
1553 | * Only used internally at session destruction. | |
1554 | */ | |
be066e6c | 1555 | static |
0648898e | 1556 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1557 | { |
0648898e | 1558 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1559 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1560 | ||
0648898e MD |
1561 | lttng_free_event_filter_runtime(event); |
1562 | /* Free event enabler refs */ | |
1563 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1564 | &event_priv->enablers_ref_head, node) | |
1565 | kfree(enabler_ref); | |
b4a75708 | 1566 | |
0648898e MD |
1567 | switch (event->type) { |
1568 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1569 | { | |
1570 | struct lttng_kernel_event_recorder *event_recorder = | |
1571 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1572 | |
0648898e MD |
1573 | switch (event_priv->instrumentation) { |
1574 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1575 | lttng_event_desc_put(event_priv->desc); | |
1576 | break; | |
b4a75708 | 1577 | |
0648898e MD |
1578 | case LTTNG_KERNEL_ABI_KPROBE: |
1579 | module_put(event_priv->desc->owner); | |
6a35e5bd | 1580 | lttng_kprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1581 | break; |
b4a75708 | 1582 | |
0648898e MD |
1583 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1584 | module_put(event_priv->desc->owner); | |
eb6b47db | 1585 | lttng_kretprobes_destroy_private(&event_recorder->parent); |
0648898e | 1586 | break; |
b4a75708 | 1587 | |
0648898e MD |
1588 | case LTTNG_KERNEL_ABI_SYSCALL: |
1589 | break; | |
4e3c1b9b | 1590 | |
0648898e MD |
1591 | case LTTNG_KERNEL_ABI_UPROBE: |
1592 | module_put(event_priv->desc->owner); | |
17806c46 | 1593 | lttng_uprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1594 | break; |
3ef5cc03 | 1595 | |
c190d76e MJ |
1596 | case LTTNG_KERNEL_ABI_FUNCTION: |
1597 | lttng_fallthrough; | |
1598 | case LTTNG_KERNEL_ABI_NOOP: | |
1599 | lttng_fallthrough; | |
0648898e MD |
1600 | default: |
1601 | WARN_ON_ONCE(1); | |
1602 | } | |
1603 | list_del(&event_recorder->priv->node); | |
1604 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1605 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1606 | break; |
0648898e MD |
1607 | } |
1608 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1609 | { | |
1610 | struct lttng_kernel_event_notifier *event_notifier = | |
1611 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1612 | |
0648898e MD |
1613 | switch (event_notifier->priv->parent.instrumentation) { |
1614 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1615 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1616 | break; | |
b4a75708 | 1617 | |
0648898e MD |
1618 | case LTTNG_KERNEL_ABI_KPROBE: |
1619 | module_put(event_notifier->priv->parent.desc->owner); | |
6a35e5bd | 1620 | lttng_kprobes_destroy_event_private(&event_notifier->parent); |
0648898e | 1621 | break; |
b4a75708 | 1622 | |
0648898e MD |
1623 | case LTTNG_KERNEL_ABI_SYSCALL: |
1624 | break; | |
b4a75708 | 1625 | |
0648898e MD |
1626 | case LTTNG_KERNEL_ABI_UPROBE: |
1627 | module_put(event_notifier->priv->parent.desc->owner); | |
17806c46 | 1628 | lttng_uprobes_destroy_event_private(&event_notifier->parent); |
0648898e MD |
1629 | break; |
1630 | ||
c190d76e MJ |
1631 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1632 | lttng_fallthrough; | |
1633 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1634 | lttng_fallthrough; | |
1635 | case LTTNG_KERNEL_ABI_NOOP: | |
1636 | lttng_fallthrough; | |
0648898e MD |
1637 | default: |
1638 | WARN_ON_ONCE(1); | |
1639 | } | |
1640 | list_del(&event_notifier->priv->node); | |
1641 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1642 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1643 | break; | |
1644 | } | |
dffef45d FD |
1645 | default: |
1646 | WARN_ON_ONCE(1); | |
1647 | } | |
dffef45d FD |
1648 | } |
1649 | ||
8c0393c3 | 1650 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1651 | enum tracker_type tracker_type) |
e0130fab | 1652 | { |
d1f652f8 MD |
1653 | switch (tracker_type) { |
1654 | case TRACKER_PID: | |
1655 | return &session->pid_tracker; | |
1656 | case TRACKER_VPID: | |
1657 | return &session->vpid_tracker; | |
1658 | case TRACKER_UID: | |
1659 | return &session->uid_tracker; | |
1660 | case TRACKER_VUID: | |
1661 | return &session->vuid_tracker; | |
1662 | case TRACKER_GID: | |
1663 | return &session->gid_tracker; | |
1664 | case TRACKER_VGID: | |
1665 | return &session->vgid_tracker; | |
1666 | default: | |
1667 | WARN_ON_ONCE(1); | |
1668 | return NULL; | |
1669 | } | |
1670 | } | |
1671 | ||
8cdc1a81 | 1672 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1673 | enum tracker_type tracker_type, int id) |
1674 | { | |
8c0393c3 | 1675 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1676 | int ret; |
1677 | ||
d1f652f8 MD |
1678 | tracker = get_tracker(session, tracker_type); |
1679 | if (!tracker) | |
1680 | return -EINVAL; | |
1681 | if (id < -1) | |
e0130fab MD |
1682 | return -EINVAL; |
1683 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1684 | if (id == -1) { |
1685 | /* track all ids: destroy tracker. */ | |
1686 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1687 | ret = 0; |
1688 | } else { | |
d1f652f8 | 1689 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1690 | } |
e0130fab MD |
1691 | mutex_unlock(&sessions_mutex); |
1692 | return ret; | |
1693 | } | |
1694 | ||
8cdc1a81 | 1695 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1696 | enum tracker_type tracker_type, int id) |
e0130fab | 1697 | { |
8c0393c3 | 1698 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1699 | int ret; |
1700 | ||
d1f652f8 MD |
1701 | tracker = get_tracker(session, tracker_type); |
1702 | if (!tracker) | |
1703 | return -EINVAL; | |
1704 | if (id < -1) | |
e0130fab MD |
1705 | return -EINVAL; |
1706 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1707 | if (id == -1) { |
1708 | /* untrack all ids: replace by empty tracker. */ | |
1709 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1710 | } else { |
d1f652f8 | 1711 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1712 | } |
e0130fab MD |
1713 | mutex_unlock(&sessions_mutex); |
1714 | return ret; | |
1715 | } | |
1716 | ||
7e6f9ef6 | 1717 | static |
d1f652f8 | 1718 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1719 | { |
8c0393c3 MD |
1720 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1721 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1722 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1723 | int iter = 0, i; |
1724 | ||
1725 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1726 | if (id_tracker_p) { |
1727 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1728 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1729 | |
f934e302 | 1730 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1731 | if (iter++ >= *pos) |
1732 | return e; | |
1733 | } | |
1734 | } | |
1735 | } else { | |
d1f652f8 | 1736 | /* ID tracker disabled. */ |
7e6f9ef6 | 1737 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1738 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1739 | } |
1740 | iter++; | |
1741 | } | |
1742 | /* End of list */ | |
1743 | return NULL; | |
1744 | } | |
1745 | ||
1746 | /* Called with sessions_mutex held. */ | |
1747 | static | |
d1f652f8 | 1748 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1749 | { |
8c0393c3 MD |
1750 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1751 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1752 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1753 | int iter = 0, i; |
1754 | ||
1755 | (*ppos)++; | |
d1f652f8 MD |
1756 | if (id_tracker_p) { |
1757 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1758 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1759 | |
f934e302 | 1760 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1761 | if (iter++ >= *ppos) |
1762 | return e; | |
1763 | } | |
1764 | } | |
1765 | } else { | |
d1f652f8 | 1766 | /* ID tracker disabled. */ |
7e6f9ef6 | 1767 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1768 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1769 | iter++; |
1770 | } | |
1771 | ||
1772 | /* End of list */ | |
1773 | return NULL; | |
1774 | } | |
1775 | ||
1776 | static | |
d1f652f8 | 1777 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1778 | { |
1779 | mutex_unlock(&sessions_mutex); | |
1780 | } | |
1781 | ||
1782 | static | |
d1f652f8 | 1783 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1784 | { |
8c0393c3 MD |
1785 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1786 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1787 | int id; |
7e6f9ef6 | 1788 | |
d1f652f8 | 1789 | if (p == id_tracker_p) { |
7e6f9ef6 | 1790 | /* Tracker disabled. */ |
d1f652f8 | 1791 | id = -1; |
7e6f9ef6 | 1792 | } else { |
d1f652f8 | 1793 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1794 | |
d1f652f8 MD |
1795 | id = lttng_id_tracker_get_node_id(e); |
1796 | } | |
8c0393c3 | 1797 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1798 | case TRACKER_PID: |
1799 | seq_printf(m, "process { pid = %d; };\n", id); | |
1800 | break; | |
1801 | case TRACKER_VPID: | |
1802 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1803 | break; | |
1804 | case TRACKER_UID: | |
1805 | seq_printf(m, "user { uid = %d; };\n", id); | |
1806 | break; | |
1807 | case TRACKER_VUID: | |
1808 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1809 | break; | |
1810 | case TRACKER_GID: | |
1811 | seq_printf(m, "group { gid = %d; };\n", id); | |
1812 | break; | |
1813 | case TRACKER_VGID: | |
1814 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1815 | break; | |
1816 | default: | |
1817 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1818 | } |
7e6f9ef6 MD |
1819 | return 0; |
1820 | } | |
1821 | ||
1822 | static | |
d1f652f8 MD |
1823 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1824 | .start = id_list_start, | |
1825 | .next = id_list_next, | |
1826 | .stop = id_list_stop, | |
1827 | .show = id_list_show, | |
7e6f9ef6 MD |
1828 | }; |
1829 | ||
1830 | static | |
d1f652f8 | 1831 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1832 | { |
d1f652f8 | 1833 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1834 | } |
1835 | ||
1836 | static | |
d1f652f8 | 1837 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1838 | { |
1839 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1840 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1841 | int ret; |
1842 | ||
d1f652f8 | 1843 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1844 | ret = seq_release(inode, file); |
d1f652f8 | 1845 | if (!ret) |
8c0393c3 | 1846 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1847 | return ret; |
1848 | } | |
1849 | ||
d1f652f8 | 1850 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1851 | .owner = THIS_MODULE, |
d1f652f8 | 1852 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1853 | .read = seq_read, |
1854 | .llseek = seq_lseek, | |
d1f652f8 | 1855 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1856 | }; |
1857 | ||
8cdc1a81 | 1858 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1859 | enum tracker_type tracker_type) |
7e6f9ef6 | 1860 | { |
d1f652f8 | 1861 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1862 | struct seq_file *m; |
1863 | int file_fd, ret; | |
1864 | ||
1865 | file_fd = lttng_get_unused_fd(); | |
1866 | if (file_fd < 0) { | |
1867 | ret = file_fd; | |
1868 | goto fd_error; | |
1869 | } | |
1870 | ||
d1f652f8 MD |
1871 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1872 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1873 | NULL, O_RDWR); |
d1f652f8 MD |
1874 | if (IS_ERR(tracker_ids_list_file)) { |
1875 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1876 | goto file_error; |
1877 | } | |
8cdc1a81 | 1878 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1879 | ret = -EOVERFLOW; |
9c1f4643 MD |
1880 | goto refcount_error; |
1881 | } | |
d1f652f8 | 1882 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1883 | if (ret < 0) |
1884 | goto open_error; | |
d1f652f8 MD |
1885 | m = tracker_ids_list_file->private_data; |
1886 | ||
1887 | m->private = get_tracker(session, tracker_type); | |
1888 | BUG_ON(!m->private); | |
1889 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1890 | |
1891 | return file_fd; | |
1892 | ||
1893 | open_error: | |
8cdc1a81 | 1894 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1895 | refcount_error: |
d1f652f8 | 1896 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1897 | file_error: |
1898 | put_unused_fd(file_fd); | |
1899 | fd_error: | |
1900 | return ret; | |
1901 | } | |
1902 | ||
3c997079 MD |
1903 | /* |
1904 | * Enabler management. | |
1905 | */ | |
1906 | static | |
4993071a PP |
1907 | int lttng_match_enabler_star_glob(const char *desc_name, |
1908 | const char *pattern) | |
3c997079 | 1909 | { |
cbc19040 MD |
1910 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1911 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1912 | return 0; |
1913 | return 1; | |
1914 | } | |
1915 | ||
1916 | static | |
4ecb5ad5 MD |
1917 | int lttng_match_enabler_name(const char *desc_name, |
1918 | const char *name) | |
3c997079 | 1919 | { |
4ecb5ad5 | 1920 | if (strcmp(desc_name, name)) |
3c997079 MD |
1921 | return 0; |
1922 | return 1; | |
1923 | } | |
1924 | ||
437d5aa5 | 1925 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
8d554755 | 1926 | struct lttng_event_enabler_common *enabler) |
3c997079 | 1927 | { |
4ecb5ad5 | 1928 | const char *desc_name, *enabler_name; |
badfe9f5 | 1929 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1930 | |
1931 | enabler_name = enabler->event_param.name; | |
1932 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1933 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1934 | desc_name = desc->event_name; |
3b861b22 FD |
1935 | switch (enabler->format_type) { |
1936 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1937 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1938 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1939 | return lttng_match_enabler_name(desc_name, enabler_name); |
1940 | default: | |
1941 | return -EINVAL; | |
1942 | } | |
4ecb5ad5 | 1943 | break; |
b4a75708 | 1944 | |
606828e4 | 1945 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1946 | desc_name = desc->event_name; |
badfe9f5 | 1947 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1948 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1949 | compat = true; |
1950 | } | |
4ecb5ad5 MD |
1951 | if (!strncmp(desc_name, "syscall_exit_", |
1952 | strlen("syscall_exit_"))) { | |
1953 | desc_name += strlen("syscall_exit_"); | |
1954 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1955 | strlen("syscall_entry_"))) { | |
1956 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1957 | entry = true; |
4ecb5ad5 MD |
1958 | } else { |
1959 | WARN_ON_ONCE(1); | |
1960 | return -EINVAL; | |
1961 | } | |
badfe9f5 | 1962 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1963 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1964 | break; |
606828e4 | 1965 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1966 | if (!entry) |
1967 | return 0; | |
1968 | break; | |
606828e4 | 1969 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1970 | if (entry) |
1971 | return 0; | |
1972 | break; | |
1973 | default: | |
1974 | return -EINVAL; | |
1975 | } | |
1976 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 1977 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 1978 | break; |
606828e4 | 1979 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
1980 | if (compat) |
1981 | return 0; | |
1982 | break; | |
606828e4 | 1983 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
1984 | if (!compat) |
1985 | return 0; | |
1986 | break; | |
1987 | default: | |
1988 | return -EINVAL; | |
1989 | } | |
1990 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 1991 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
1992 | switch (enabler->format_type) { |
1993 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1994 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1995 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1996 | return lttng_match_enabler_name(desc_name, enabler_name); |
1997 | default: | |
1998 | return -EINVAL; | |
1999 | } | |
2000 | break; | |
606828e4 | 2001 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2002 | return -EINVAL; /* Not implemented. */ |
2003 | default: | |
2004 | return -EINVAL; | |
2005 | } | |
4ecb5ad5 | 2006 | break; |
b4a75708 | 2007 | |
4ecb5ad5 MD |
2008 | default: |
2009 | WARN_ON_ONCE(1); | |
2010 | return -EINVAL; | |
2011 | } | |
3c997079 MD |
2012 | } |
2013 | ||
2014 | static | |
1ae083ba | 2015 | int lttng_event_enabler_match_event(struct lttng_event_recorder_enabler *event_enabler, |
a67ba386 | 2016 | struct lttng_kernel_event_recorder *event_recorder) |
3c997079 | 2017 | { |
1ae083ba | 2018 | struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler( |
b2bc0bc8 FD |
2019 | event_enabler); |
2020 | ||
a67ba386 | 2021 | if (base_enabler->event_param.instrumentation != event_recorder->priv->parent.instrumentation) |
33a39a3c | 2022 | return 0; |
a67ba386 MD |
2023 | if (lttng_desc_match_enabler(event_recorder->priv->parent.desc, base_enabler) |
2024 | && event_recorder->chan == event_enabler->chan) | |
3c997079 MD |
2025 | return 1; |
2026 | else | |
2027 | return 0; | |
2028 | } | |
2029 | ||
b01155ba FD |
2030 | static |
2031 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 2032 | struct lttng_kernel_event_notifier *event_notifier) |
b01155ba | 2033 | { |
8d554755 | 2034 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler( |
b01155ba FD |
2035 | event_notifier_enabler); |
2036 | ||
a67ba386 | 2037 | if (base_enabler->event_param.instrumentation != event_notifier->priv->parent.instrumentation) |
b01155ba | 2038 | return 0; |
a67ba386 MD |
2039 | if (lttng_desc_match_enabler(event_notifier->priv->parent.desc, base_enabler) |
2040 | && event_notifier->priv->group == event_notifier_enabler->group | |
5b9817ae | 2041 | && event_notifier->priv->parent.user_token == event_notifier_enabler->parent.user_token) |
b01155ba FD |
2042 | return 1; |
2043 | else | |
2044 | return 0; | |
2045 | } | |
2046 | ||
3c997079 | 2047 | static |
b2bc0bc8 FD |
2048 | struct lttng_enabler_ref *lttng_enabler_ref( |
2049 | struct list_head *enablers_ref_list, | |
8d554755 | 2050 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2051 | { |
2052 | struct lttng_enabler_ref *enabler_ref; | |
2053 | ||
b2bc0bc8 | 2054 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2055 | if (enabler_ref->ref == enabler) |
2056 | return enabler_ref; | |
2057 | } | |
2058 | return NULL; | |
2059 | } | |
2060 | ||
3c997079 | 2061 | static |
1ae083ba | 2062 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler *event_enabler) |
3c997079 | 2063 | { |
f7d06400 | 2064 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; |
437d5aa5 MD |
2065 | struct lttng_kernel_probe_desc *probe_desc; |
2066 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2067 | int i; |
2068 | struct list_head *probe_list; | |
2069 | ||
2070 | probe_list = lttng_get_probe_list_head(); | |
2071 | /* | |
2072 | * For each probe event, if we find that a probe event matches | |
2073 | * our enabler, create an associated lttng_event if not | |
2074 | * already present. | |
2075 | */ | |
2076 | list_for_each_entry(probe_desc, probe_list, head) { | |
2077 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2078 | int found = 0; | |
2079 | struct hlist_head *head; | |
a67ba386 MD |
2080 | struct lttng_kernel_event_recorder_private *event_recorder_private; |
2081 | struct lttng_kernel_event_recorder *event_recorder; | |
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 | */ | |
4a11ef1c | 2091 | head = utils_borrow_hash_table_bucket( |
8cdc1a81 | 2092 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 2093 | desc->event_name); |
a67ba386 MD |
2094 | lttng_hlist_for_each_entry(event_recorder_private, head, hlist) { |
2095 | if (event_recorder_private->parent.desc == desc | |
2096 | && event_recorder_private->pub->chan == event_enabler->chan) | |
3c997079 MD |
2097 | found = 1; |
2098 | } | |
2099 | if (found) | |
2100 | continue; | |
2101 | ||
2102 | /* | |
2103 | * We need to create an event for this | |
2104 | * event probe. | |
2105 | */ | |
def1e304 | 2106 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); |
a67ba386 | 2107 | if (!event_recorder) { |
5a15f70c | 2108 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2109 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2110 | } |
2111 | } | |
2112 | } | |
2113 | } | |
2114 | ||
b01155ba FD |
2115 | static |
2116 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2117 | { | |
2118 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
437d5aa5 MD |
2119 | struct lttng_kernel_probe_desc *probe_desc; |
2120 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2121 | int i; |
2122 | struct list_head *probe_list; | |
2123 | ||
2124 | probe_list = lttng_get_probe_list_head(); | |
2125 | /* | |
2126 | * For each probe event, if we find that a probe event matches | |
2127 | * our enabler, create an associated lttng_event_notifier if not | |
2128 | * already present. | |
2129 | */ | |
2130 | list_for_each_entry(probe_desc, probe_list, head) { | |
2131 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2132 | int found = 0; | |
2133 | struct hlist_head *head; | |
a67ba386 MD |
2134 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
2135 | struct lttng_kernel_event_notifier *event_notifier; | |
b01155ba FD |
2136 | |
2137 | desc = probe_desc->event_desc[i]; | |
2138 | if (!lttng_desc_match_enabler(desc, | |
2139 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2140 | continue; | |
2141 | ||
2142 | /* | |
2143 | * Check if already created. | |
2144 | */ | |
2145 | head = utils_borrow_hash_table_bucket( | |
33af697f MD |
2146 | event_notifier_group->events_ht.table, |
2147 | LTTNG_EVENT_HT_SIZE, desc->event_name); | |
a67ba386 MD |
2148 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
2149 | if (event_notifier_priv->parent.desc == desc | |
5b9817ae | 2150 | && event_notifier_priv->parent.user_token == event_notifier_enabler->parent.user_token) |
b01155ba FD |
2151 | found = 1; |
2152 | } | |
2153 | if (found) | |
2154 | continue; | |
2155 | ||
2156 | /* | |
2157 | * We need to create a event_notifier for this event probe. | |
2158 | */ | |
2159 | event_notifier = _lttng_event_notifier_create(desc, | |
5b9817ae | 2160 | event_notifier_enabler->parent.user_token, |
99f52fcc | 2161 | event_notifier_enabler->error_counter_index, |
a67ba386 | 2162 | event_notifier_group, NULL, |
606828e4 | 2163 | LTTNG_KERNEL_ABI_TRACEPOINT); |
b01155ba FD |
2164 | if (IS_ERR(event_notifier)) { |
2165 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 2166 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2167 | } |
2168 | } | |
2169 | } | |
2170 | } | |
2171 | ||
33a39a3c | 2172 | static |
053554ae | 2173 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c MD |
2174 | { |
2175 | int ret; | |
2176 | ||
053554ae | 2177 | ret = lttng_syscalls_register_event(event_enabler); |
8a8ac9a8 | 2178 | WARN_ON_ONCE(ret); |
8a8ac9a8 FD |
2179 | } |
2180 | ||
33a39a3c | 2181 | /* |
a67ba386 | 2182 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2183 | * tracepoint probes. |
2184 | * Should be called with sessions mutex held. | |
2185 | */ | |
2186 | static | |
1ae083ba | 2187 | void lttng_create_event_if_missing(struct lttng_event_recorder_enabler *event_enabler) |
33a39a3c | 2188 | { |
5b9817ae | 2189 | switch (event_enabler->parent.event_param.instrumentation) { |
606828e4 | 2190 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2191 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2192 | break; |
b4a75708 | 2193 | |
606828e4 | 2194 | case LTTNG_KERNEL_ABI_SYSCALL: |
053554ae | 2195 | lttng_create_syscall_event_if_missing(&event_enabler->parent); |
33a39a3c | 2196 | break; |
b4a75708 | 2197 | |
33a39a3c MD |
2198 | default: |
2199 | WARN_ON_ONCE(1); | |
2200 | break; | |
2201 | } | |
2202 | } | |
2203 | ||
3c997079 | 2204 | /* |
b2bc0bc8 | 2205 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2206 | * and add backward reference from the event to the enabler. |
2207 | * Should be called with sessions mutex held. | |
2208 | */ | |
2209 | static | |
1ae083ba | 2210 | int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler *event_enabler) |
3c997079 | 2211 | { |
f7d06400 MD |
2212 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
2213 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; | |
1ae083ba | 2214 | struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(event_enabler); |
a67ba386 | 2215 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2216 | |
606828e4 MD |
2217 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2218 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2219 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2220 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2221 | int enabled = base_enabler->enabled; |
606828e4 | 2222 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2223 | |
606828e4 | 2224 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2225 | WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_entry, enabled); |
3b82c4e1 | 2226 | |
606828e4 | 2227 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2228 | WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_exit, enabled); |
badfe9f5 MD |
2229 | } |
2230 | ||
3c997079 | 2231 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2232 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2233 | |
b2bc0bc8 | 2234 | /* For each event matching event_enabler in session event list. */ |
8cdc1a81 | 2235 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2236 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2237 | struct lttng_enabler_ref *enabler_ref; |
2238 | ||
a67ba386 | 2239 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder)) |
3c997079 | 2240 | continue; |
a67ba386 | 2241 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
1ae083ba | 2242 | lttng_event_recorder_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2243 | if (!enabler_ref) { |
2244 | /* | |
2245 | * If no backward ref, create it. | |
b2bc0bc8 | 2246 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2247 | */ |
2248 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2249 | if (!enabler_ref) | |
2250 | return -ENOMEM; | |
1ae083ba | 2251 | enabler_ref->ref = lttng_event_recorder_enabler_as_enabler(event_enabler); |
3c997079 | 2252 | list_add(&enabler_ref->node, |
a67ba386 | 2253 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2254 | } |
2255 | ||
f127e61e MD |
2256 | /* |
2257 | * Link filter bytecodes if not linked yet. | |
2258 | */ | |
a67ba386 | 2259 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2260 | lttng_static_ctx, |
a67ba386 | 2261 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
1ae083ba | 2262 | <tng_event_recorder_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2263 | } |
2264 | return 0; | |
2265 | } | |
2266 | ||
b01155ba | 2267 | /* |
a67ba386 | 2268 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2269 | * tracepoint probes. |
2270 | * Should be called with sessions mutex held. | |
2271 | */ | |
2272 | static | |
2273 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2274 | { | |
5b9817ae | 2275 | switch (event_notifier_enabler->parent.event_param.instrumentation) { |
606828e4 | 2276 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2277 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2278 | break; | |
b4a75708 | 2279 | |
606828e4 | 2280 | case LTTNG_KERNEL_ABI_SYSCALL: |
053554ae | 2281 | lttng_create_syscall_event_if_missing(&event_notifier_enabler->parent); |
8a8ac9a8 | 2282 | break; |
b4a75708 | 2283 | |
b01155ba FD |
2284 | default: |
2285 | WARN_ON_ONCE(1); | |
2286 | break; | |
2287 | } | |
2288 | } | |
2289 | ||
2290 | /* | |
2291 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2292 | */ | |
2293 | static | |
8a8ac9a8 FD |
2294 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2295 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2296 | { |
2297 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8d554755 | 2298 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2299 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2300 | |
606828e4 MD |
2301 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2302 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2303 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2304 | !strcmp(base_enabler->event_param.name, "*")) { |
2305 | ||
2306 | int enabled = base_enabler->enabled; | |
606828e4 | 2307 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2308 | |
606828e4 | 2309 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2310 | WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_entry, enabled); |
8a8ac9a8 | 2311 | |
606828e4 | 2312 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2313 | WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_exit, enabled); |
8a8ac9a8 FD |
2314 | |
2315 | } | |
2316 | ||
b01155ba FD |
2317 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2318 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2319 | ||
2320 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2321 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2322 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2323 | struct lttng_enabler_ref *enabler_ref; |
2324 | ||
2325 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2326 | continue; | |
2327 | ||
a67ba386 | 2328 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2329 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2330 | if (!enabler_ref) { | |
2331 | /* | |
2332 | * If no backward ref, create it. | |
2333 | * Add backward ref from event_notifier to enabler. | |
2334 | */ | |
2335 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2336 | if (!enabler_ref) | |
2337 | return -ENOMEM; | |
2338 | ||
2339 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2340 | event_notifier_enabler); | |
2341 | list_add(&enabler_ref->node, | |
a67ba386 | 2342 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2343 | } |
2344 | ||
2345 | /* | |
2346 | * Link filter bytecodes if not linked yet. | |
2347 | */ | |
a67ba386 MD |
2348 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2349 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2350 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2351 | |
2352 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2353 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2354 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2355 | &event_notifier_enabler->capture_bytecode_head); |
2356 | ||
a67ba386 | 2357 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2358 | } |
2359 | return 0; | |
2360 | } | |
2361 | ||
3c997079 MD |
2362 | /* |
2363 | * Called at module load: connect the probe on all enablers matching | |
2364 | * this event. | |
2365 | * Called with sessions lock held. | |
2366 | */ | |
2367 | int lttng_fix_pending_events(void) | |
2368 | { | |
8cdc1a81 | 2369 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2370 | |
8cdc1a81 MD |
2371 | list_for_each_entry(session_priv, &sessions, list) |
2372 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2373 | return 0; |
2374 | } | |
2375 | ||
b01155ba FD |
2376 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2377 | struct lttng_event_notifier_group *event_notifier_group) | |
2378 | { | |
2379 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2380 | ||
2381 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2382 | node) { | |
5b9817ae | 2383 | if (event_notifier_enabler->parent.enabled) |
b01155ba FD |
2384 | return true; |
2385 | } | |
2386 | return false; | |
2387 | } | |
2388 | ||
2389 | bool lttng_event_notifier_active(void) | |
2390 | { | |
2391 | struct lttng_event_notifier_group *event_notifier_group; | |
2392 | ||
2393 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2394 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2395 | return true; | |
2396 | } | |
2397 | return false; | |
2398 | } | |
2399 | ||
2400 | int lttng_fix_pending_event_notifiers(void) | |
2401 | { | |
2402 | struct lttng_event_notifier_group *event_notifier_group; | |
2403 | ||
2404 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2405 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2406 | return 0; | |
2407 | } | |
2408 | ||
1ae083ba | 2409 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2410 | enum lttng_enabler_format_type format_type, |
606828e4 | 2411 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2412 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2413 | { |
1ae083ba | 2414 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2415 | |
b2bc0bc8 FD |
2416 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2417 | if (!event_enabler) | |
3c997079 | 2418 | return NULL; |
0bb716a8 | 2419 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2420 | event_enabler->parent.format_type = format_type; |
2421 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2422 | memcpy(&event_enabler->parent.event_param, event_param, | |
2423 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2424 | event_enabler->chan = chan; |
3c997079 | 2425 | /* ctx left NULL */ |
5b9817ae | 2426 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2427 | return event_enabler; |
2428 | } | |
2429 | ||
2430 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2431 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2432 | { |
3c997079 | 2433 | mutex_lock(&sessions_mutex); |
def1e304 MD |
2434 | list_add(&event_enabler->node, &session->priv->enablers_head); |
2435 | event_enabler->published = true; | |
2436 | lttng_session_lazy_sync_event_enablers(session); | |
3c997079 | 2437 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2438 | } |
2439 | ||
7b25ab0e | 2440 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2441 | { |
2442 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2443 | event_enabler->enabled = 1; |
2444 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2445 | mutex_unlock(&sessions_mutex); |
2446 | return 0; | |
2447 | } | |
2448 | ||
7b25ab0e | 2449 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2450 | { |
2451 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2452 | event_enabler->enabled = 0; |
2453 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2454 | mutex_unlock(&sessions_mutex); |
2455 | return 0; | |
2456 | } | |
2457 | ||
b2bc0bc8 | 2458 | static |
8d554755 | 2459 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2460 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2461 | { |
d64ca521 | 2462 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2463 | uint32_t bytecode_len; |
2464 | int ret; | |
2465 | ||
2466 | ret = get_user(bytecode_len, &bytecode->len); | |
2467 | if (ret) | |
2468 | return ret; | |
52cfcdf3 | 2469 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2470 | GFP_KERNEL); |
2471 | if (!bytecode_node) | |
2472 | return -ENOMEM; | |
2473 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2474 | sizeof(*bytecode) + bytecode_len); | |
2475 | if (ret) | |
2476 | goto error_free; | |
b2bc0bc8 | 2477 | |
8a445457 | 2478 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2479 | bytecode_node->enabler = enabler; |
2480 | /* Enforce length based on allocated size */ | |
2481 | bytecode_node->bc.len = bytecode_len; | |
2482 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2483 | |
07dfc1d0 MD |
2484 | return 0; |
2485 | ||
2486 | error_free: | |
52cfcdf3 | 2487 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2488 | return ret; |
2489 | } | |
2490 | ||
6048044f | 2491 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2492 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2493 | { |
2494 | int ret; | |
6048044f | 2495 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2496 | if (ret) |
2497 | goto error; | |
7b25ab0e | 2498 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2499 | return 0; |
2500 | ||
2501 | error: | |
2502 | return ret; | |
2503 | } | |
2504 | ||
e2d5dbc7 | 2505 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2506 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2507 | { |
2508 | ||
e2d5dbc7 | 2509 | switch (event->priv->instrumentation) { |
606828e4 | 2510 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2511 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2512 | default: |
2513 | return -EINVAL; | |
2514 | } | |
2515 | } | |
2516 | ||
3c997079 | 2517 | static |
8d554755 | 2518 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2519 | { |
d64ca521 | 2520 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2521 | |
2522 | /* Destroy filter bytecode */ | |
2523 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2524 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2525 | lttng_kvfree(filter_node); |
07dfc1d0 | 2526 | } |
b2bc0bc8 FD |
2527 | } |
2528 | ||
44b1abdc | 2529 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2530 | { |
44b1abdc MD |
2531 | switch (event_enabler->enabler_type) { |
2532 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2533 | { | |
2534 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2535 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2536 | ||
2537 | lttng_enabler_destroy(event_enabler); | |
2538 | if (event_recorder_enabler->published) | |
2539 | list_del(&event_recorder_enabler->node); | |
2540 | kfree(event_recorder_enabler); | |
2541 | break; | |
2542 | } | |
2543 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2544 | { | |
2545 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2546 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2547 | |
44b1abdc MD |
2548 | list_del(&event_notifier_enabler->node); |
2549 | lttng_enabler_destroy(event_enabler); | |
2550 | kfree(event_notifier_enabler); | |
2551 | break; | |
2552 | } | |
2553 | default: | |
2554 | WARN_ON_ONCE(1); | |
2555 | } | |
3c997079 MD |
2556 | } |
2557 | ||
dffef45d FD |
2558 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2559 | struct lttng_event_notifier_group *event_notifier_group, | |
2560 | enum lttng_enabler_format_type format_type, | |
606828e4 | 2561 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2562 | { |
2563 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2564 | ||
2565 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2566 | if (!event_notifier_enabler) | |
2567 | return NULL; | |
2568 | ||
0bb716a8 | 2569 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2570 | event_notifier_enabler->parent.format_type = format_type; |
2571 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2572 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2573 | ||
99f52fcc | 2574 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2575 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2576 | |
5b9817ae MD |
2577 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2578 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2579 | |
5b9817ae MD |
2580 | event_notifier_enabler->parent.enabled = 0; |
2581 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d FD |
2582 | event_notifier_enabler->group = event_notifier_group; |
2583 | ||
2584 | mutex_lock(&sessions_mutex); | |
2585 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2586 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2587 | |
2588 | mutex_unlock(&sessions_mutex); | |
2589 | ||
2590 | return event_notifier_enabler; | |
2591 | } | |
2592 | ||
2593 | int lttng_event_notifier_enabler_enable( | |
2594 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2595 | { | |
2596 | mutex_lock(&sessions_mutex); | |
2597 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2598 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2599 | mutex_unlock(&sessions_mutex); |
2600 | return 0; | |
2601 | } | |
2602 | ||
2603 | int lttng_event_notifier_enabler_disable( | |
2604 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2605 | { | |
2606 | mutex_lock(&sessions_mutex); | |
2607 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2608 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2609 | mutex_unlock(&sessions_mutex); |
2610 | return 0; | |
2611 | } | |
2612 | ||
99d223ad FD |
2613 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2614 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2615 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2616 | { |
d64ca521 | 2617 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2618 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2619 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2620 | uint32_t bytecode_len; | |
2621 | int ret; | |
2622 | ||
2623 | ret = get_user(bytecode_len, &bytecode->len); | |
2624 | if (ret) | |
2625 | return ret; | |
2626 | ||
2627 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2628 | GFP_KERNEL); | |
2629 | if (!bytecode_node) | |
2630 | return -ENOMEM; | |
2631 | ||
2632 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2633 | sizeof(*bytecode) + bytecode_len); | |
2634 | if (ret) | |
2635 | goto error_free; | |
2636 | ||
8a445457 | 2637 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2638 | bytecode_node->enabler = enabler; |
2639 | ||
2640 | /* Enforce length based on allocated size */ | |
2641 | bytecode_node->bc.len = bytecode_len; | |
2642 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2643 | ||
2644 | event_notifier_enabler->num_captures++; | |
2645 | ||
2646 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2647 | goto end; | |
2648 | ||
2649 | error_free: | |
2650 | lttng_kvfree(bytecode_node); | |
2651 | end: | |
2652 | return ret; | |
2653 | } | |
2654 | ||
3c997079 | 2655 | /* |
b2bc0bc8 | 2656 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2657 | * session. |
2658 | * Should be called with sessions mutex held. | |
2659 | */ | |
2660 | static | |
8cdc1a81 | 2661 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2662 | { |
1ae083ba | 2663 | struct lttng_event_recorder_enabler *event_enabler; |
a67ba386 | 2664 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2665 | |
8cdc1a81 | 2666 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2667 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2668 | /* |
2669 | * For each event, if at least one of its enablers is enabled, | |
2670 | * and its channel and session transient states are enabled, we | |
2671 | * enable the event, else we disable it. | |
2672 | */ | |
8cdc1a81 | 2673 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2674 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2675 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2676 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2677 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2678 | int nr_filters = 0; | |
3c997079 | 2679 | |
a67ba386 | 2680 | switch (event_recorder_priv->parent.instrumentation) { |
c190d76e MJ |
2681 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2682 | lttng_fallthrough; | |
606828e4 | 2683 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
2684 | /* Enable events */ |
2685 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2686 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2687 | if (enabler_ref->ref->enabled) { |
2688 | enabled = 1; | |
2689 | break; | |
2690 | } | |
2691 | } | |
4ecb5ad5 | 2692 | break; |
b4a75708 | 2693 | |
4ecb5ad5 | 2694 | default: |
3c997079 MD |
2695 | /* Not handled with lazy sync. */ |
2696 | continue; | |
2697 | } | |
2698 | /* | |
2699 | * Enabled state is based on union of enablers, with | |
2700 | * intesection of session and channel transient enable | |
2701 | * states. | |
2702 | */ | |
f7d06400 | 2703 | enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; |
3c997079 | 2704 | |
a67ba386 | 2705 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2706 | /* |
2707 | * Sync tracepoint registration with event enabled | |
2708 | * state. | |
2709 | */ | |
2710 | if (enabled) { | |
0c851fa0 | 2711 | register_event(&event_recorder->parent); |
3c997079 | 2712 | } else { |
f0bcc14c | 2713 | _lttng_event_unregister(&event_recorder->parent); |
3c997079 | 2714 | } |
07dfc1d0 MD |
2715 | |
2716 | /* Check if has enablers without bytecode enabled */ | |
2717 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2718 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2719 | if (enabler_ref->ref->enabled |
2720 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2721 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2722 | break; |
2723 | } | |
2724 | } | |
a67ba386 | 2725 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2726 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2727 | |
2728 | /* Enable filters */ | |
2729 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2730 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2731 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2732 | nr_filters++; |
2733 | } | |
2734 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2735 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2736 | } |
2737 | } | |
2738 | ||
2739 | /* | |
2740 | * Apply enablers to session events, adding events to session if need | |
2741 | * be. It is required after each modification applied to an active | |
2742 | * session, and right before session "start". | |
2743 | * "lazy" sync means we only sync if required. | |
2744 | * Should be called with sessions mutex held. | |
2745 | */ | |
2746 | static | |
8cdc1a81 | 2747 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2748 | { |
2749 | /* We can skip if session is not active */ | |
2750 | if (!session->active) | |
2751 | return; | |
b2bc0bc8 | 2752 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2753 | } |
2754 | ||
b01155ba FD |
2755 | static |
2756 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2757 | { | |
2758 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2759 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2760 | |
2761 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2762 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2763 | ||
2764 | /* | |
2765 | * For each event_notifier, if at least one of its enablers is enabled, | |
2766 | * we enable the event_notifier, else we disable it. | |
2767 | */ | |
a67ba386 MD |
2768 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2769 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2770 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2771 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2772 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2773 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2774 | |
a67ba386 | 2775 | switch (event_notifier_priv->parent.instrumentation) { |
c190d76e MJ |
2776 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2777 | lttng_fallthrough; | |
606828e4 | 2778 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
2779 | /* Enable event_notifiers */ |
2780 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2781 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2782 | if (enabler_ref->ref->enabled) { |
2783 | enabled = 1; | |
2784 | break; | |
2785 | } | |
2786 | } | |
2787 | break; | |
b4a75708 | 2788 | |
b01155ba FD |
2789 | default: |
2790 | /* Not handled with sync. */ | |
2791 | continue; | |
2792 | } | |
2793 | ||
a67ba386 | 2794 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2795 | /* |
2796 | * Sync tracepoint registration with event_notifier enabled | |
2797 | * state. | |
2798 | */ | |
2799 | if (enabled) { | |
a67ba386 | 2800 | if (!event_notifier_priv->parent.registered) |
0c851fa0 | 2801 | register_event(&event_notifier->parent); |
b01155ba | 2802 | } else { |
a67ba386 | 2803 | if (event_notifier_priv->parent.registered) |
f0bcc14c | 2804 | _lttng_event_unregister(&event_notifier->parent); |
b01155ba FD |
2805 | } |
2806 | ||
2807 | /* Check if has enablers without bytecode enabled */ | |
2808 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2809 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2810 | if (enabler_ref->ref->enabled |
2811 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2812 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2813 | break; |
2814 | } | |
2815 | } | |
a67ba386 | 2816 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2817 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2818 | |
2819 | /* Enable filters */ | |
2820 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2821 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2822 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2823 | nr_filters++; |
2824 | } | |
2825 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2826 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2827 | |
2828 | /* Enable captures */ | |
2829 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2830 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2831 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2832 | nr_captures++; |
2833 | } | |
2834 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2835 | } |
2836 | } | |
2837 | ||
7b25ab0e MD |
2838 | static |
2839 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2840 | { | |
2841 | switch (event_enabler->enabler_type) { | |
2842 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2843 | { | |
2844 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2845 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2846 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2847 | break; | |
2848 | } | |
2849 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2850 | { | |
2851 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2852 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2853 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2854 | break; | |
2855 | } | |
2856 | default: | |
2857 | WARN_ON_ONCE(1); | |
2858 | } | |
2859 | } | |
2860 | ||
1ec3f75a | 2861 | /* |
d83004aa JD |
2862 | * Serialize at most one packet worth of metadata into a metadata |
2863 | * channel. | |
92d9f5e6 MD |
2864 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2865 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2866 | * allows us to do racy operations such as looking for remaining space left in | |
2867 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2868 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2869 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2870 | * Returns the number of bytes written in the channel, 0 if no data |
2871 | * was written and a negative value on error. | |
1ec3f75a | 2872 | */ |
b3b8072b | 2873 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2874 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2875 | { |
8a57ec02 | 2876 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2877 | int ret = 0; |
2878 | size_t len, reserve_len; | |
2879 | ||
f613e3e6 | 2880 | /* |
92d9f5e6 MD |
2881 | * Ensure we support mutiple get_next / put sequences followed by |
2882 | * put_next. The metadata cache lock protects reading the metadata | |
2883 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2884 | * "flush" operations on the buffer invoked by different processes. | |
2885 | * Moreover, since the metadata cache memory can be reallocated, we | |
2886 | * need to have exclusive access against updates even though we only | |
2887 | * read it. | |
f613e3e6 | 2888 | */ |
92d9f5e6 | 2889 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2890 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2891 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2892 | goto end; |
f613e3e6 | 2893 | |
9616f0bf JD |
2894 | /* Metadata regenerated, change the version. */ |
2895 | if (stream->metadata_cache->version != stream->version) | |
2896 | stream->version = stream->metadata_cache->version; | |
2897 | ||
d83004aa | 2898 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2899 | stream->metadata_in; |
9de2c215 | 2900 | if (!len) |
de23d59d | 2901 | goto end; |
d83004aa | 2902 | reserve_len = min_t(size_t, |
4a399b76 | 2903 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2904 | len); |
a775608d | 2905 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2906 | sizeof(char), NULL); |
d83004aa JD |
2907 | /* |
2908 | * If reservation failed, return an error to the caller. | |
2909 | */ | |
c2fb9c1c | 2910 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2911 | if (ret != 0) { |
2912 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2913 | stream->coherent = false; |
d83004aa JD |
2914 | goto end; |
2915 | } | |
b3b8072b | 2916 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2917 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2918 | reserve_len, 1); |
b3b8072b | 2919 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2920 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2921 | if (reserve_len < len) |
8b97fd42 MD |
2922 | stream->coherent = false; |
2923 | else | |
2924 | stream->coherent = true; | |
d83004aa JD |
2925 | ret = reserve_len; |
2926 | ||
2927 | end: | |
8b97fd42 MD |
2928 | if (coherent) |
2929 | *coherent = stream->coherent; | |
92d9f5e6 | 2930 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2931 | return ret; |
2932 | } | |
2933 | ||
8b97fd42 | 2934 | static |
8cdc1a81 | 2935 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2936 | { |
8cdc1a81 MD |
2937 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2938 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2939 | } |
2940 | ||
2941 | static | |
8cdc1a81 | 2942 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2943 | { |
8cdc1a81 MD |
2944 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2945 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2946 | struct lttng_metadata_stream *stream; |
2947 | ||
8cdc1a81 | 2948 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2949 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2950 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2951 | } |
8b97fd42 MD |
2952 | } |
2953 | ||
d83004aa JD |
2954 | /* |
2955 | * Write the metadata to the metadata cache. | |
2956 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2957 | * The metadata cache lock protects us from concurrent read access from |
2958 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2959 | * The content of the printf is printed as a single atomic metadata |
2960 | * transaction. | |
d83004aa | 2961 | */ |
8cdc1a81 | 2962 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2963 | const char *fmt, ...) |
2964 | { | |
c099397a | 2965 | char *str; |
d83004aa | 2966 | size_t len; |
c099397a MD |
2967 | va_list ap; |
2968 | ||
585e5dcc | 2969 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2970 | |
2971 | va_start(ap, fmt); | |
2972 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2973 | va_end(ap); | |
2974 | if (!str) | |
2975 | return -ENOMEM; | |
2976 | ||
1ec3f75a | 2977 | len = strlen(str); |
8cdc1a81 MD |
2978 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2979 | if (session->priv->metadata_cache->metadata_written + len > | |
2980 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
2981 | char *tmp_cache_realloc; |
2982 | unsigned int tmp_cache_alloc_size; | |
2983 | ||
2984 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
2985 | session->priv->metadata_cache->cache_alloc + len, |
2986 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2987 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2988 | if (!tmp_cache_realloc) |
2989 | goto err; | |
8cdc1a81 | 2990 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 2991 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
2992 | session->priv->metadata_cache->data, |
2993 | session->priv->metadata_cache->cache_alloc); | |
2994 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
2995 | } |
2996 | ||
8cdc1a81 MD |
2997 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2998 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2999 | } |
8cdc1a81 MD |
3000 | memcpy(session->priv->metadata_cache->data + |
3001 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3002 | str, len); |
8cdc1a81 | 3003 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3004 | kfree(str); |
d83004aa | 3005 | |
d83004aa JD |
3006 | return 0; |
3007 | ||
3008 | err: | |
3009 | kfree(str); | |
3010 | return -ENOMEM; | |
c099397a MD |
3011 | } |
3012 | ||
f513b2bf | 3013 | static |
8cdc1a81 | 3014 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3015 | { |
3016 | size_t i; | |
3017 | ||
3018 | for (i = 0; i < nesting; i++) { | |
3019 | int ret; | |
3020 | ||
3021 | ret = lttng_metadata_printf(session, " "); | |
3022 | if (ret) { | |
3023 | return ret; | |
3024 | } | |
3025 | } | |
3026 | return 0; | |
3027 | } | |
3028 | ||
ceabb767 | 3029 | static |
8cdc1a81 | 3030 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3031 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3032 | size_t nesting) |
3033 | { | |
3034 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3035 | } | |
3036 | ||
3037 | static | |
8cdc1a81 | 3038 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3039 | const struct lttng_kernel_type_integer *type, |
3040 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3041 | size_t nesting) |
3042 | { | |
3043 | int ret; | |
3044 | ||
ceabb767 MD |
3045 | ret = print_tabs(session, nesting); |
3046 | if (ret) | |
3047 | return ret; | |
3048 | ret = lttng_metadata_printf(session, | |
3049 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3050 | type->size, |
3051 | type->alignment, | |
3052 | type->signedness, | |
3053 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3054 | ? "none" |
437d5aa5 | 3055 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3056 | ? "UTF8" |
3057 | : "ASCII", | |
437d5aa5 | 3058 | type->base, |
ceabb767 | 3059 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3060 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3061 | #else |
437d5aa5 | 3062 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3063 | #endif |
3064 | ); | |
3065 | return ret; | |
3066 | } | |
3067 | ||
f513b2bf MD |
3068 | /* |
3069 | * Must be called with sessions_mutex held. | |
3070 | */ | |
3071 | static | |
8cdc1a81 | 3072 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3073 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3074 | size_t nesting) |
3075 | { | |
51ef4536 | 3076 | const char *prev_field_name = NULL; |
f513b2bf MD |
3077 | int ret; |
3078 | uint32_t i, nr_fields; | |
ceabb767 MD |
3079 | unsigned int alignment; |
3080 | ||
f513b2bf MD |
3081 | ret = print_tabs(session, nesting); |
3082 | if (ret) | |
3083 | return ret; | |
3084 | ret = lttng_metadata_printf(session, | |
3085 | "struct {\n"); | |
3086 | if (ret) | |
3087 | return ret; | |
437d5aa5 | 3088 | nr_fields = type->nr_fields; |
f513b2bf | 3089 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3090 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3091 | |
437d5aa5 | 3092 | iter_field = type->fields[i]; |
51ef4536 | 3093 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3094 | if (ret) |
3095 | return ret; | |
3096 | } | |
3097 | ret = print_tabs(session, nesting); | |
3098 | if (ret) | |
3099 | return ret; | |
437d5aa5 | 3100 | alignment = type->alignment; |
ceabb767 MD |
3101 | if (alignment) { |
3102 | ret = lttng_metadata_printf(session, | |
3103 | "} align(%u)", | |
3104 | alignment); | |
3105 | } else { | |
3106 | ret = lttng_metadata_printf(session, | |
3107 | "}"); | |
3108 | } | |
f513b2bf MD |
3109 | return ret; |
3110 | } | |
3111 | ||
3112 | /* | |
3113 | * Must be called with sessions_mutex held. | |
3114 | */ | |
3115 | static | |
8cdc1a81 | 3116 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3117 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3118 | size_t nesting) |
3119 | { | |
3120 | int ret; | |
3121 | ||
3122 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3123 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3124 | if (ret) |
3125 | return ret; | |
ceabb767 | 3126 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3127 | } |
3128 | ||
65c85aa6 MD |
3129 | /* |
3130 | * Must be called with sessions_mutex held. | |
3131 | */ | |
3132 | static | |
8cdc1a81 | 3133 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3134 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3135 | size_t nesting, |
3136 | const char *prev_field_name) | |
65c85aa6 | 3137 | { |
51ef4536 | 3138 | const char *tag_name; |
65c85aa6 MD |
3139 | int ret; |
3140 | uint32_t i, nr_choices; | |
3141 | ||
51ef4536 MD |
3142 | tag_name = type->tag_name; |
3143 | if (!tag_name) | |
3144 | tag_name = prev_field_name; | |
3145 | if (!tag_name) | |
3146 | return -EINVAL; | |
ceabb767 MD |
3147 | /* |
3148 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3149 | */ | |
437d5aa5 | 3150 | if (type->alignment != 0) |
ceabb767 | 3151 | return -EINVAL; |
65c85aa6 MD |
3152 | ret = print_tabs(session, nesting); |
3153 | if (ret) | |
3154 | return ret; | |
3155 | ret = lttng_metadata_printf(session, | |
3156 | "variant <_%s> {\n", | |
51ef4536 | 3157 | tag_name); |
65c85aa6 MD |
3158 | if (ret) |
3159 | return ret; | |
437d5aa5 | 3160 | nr_choices = type->nr_choices; |
65c85aa6 | 3161 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3162 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3163 | |
437d5aa5 | 3164 | iter_field = type->choices[i]; |
51ef4536 | 3165 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3166 | if (ret) |
3167 | return ret; | |
3168 | } | |
3169 | ret = print_tabs(session, nesting); | |
3170 | if (ret) | |
3171 | return ret; | |
3172 | ret = lttng_metadata_printf(session, | |
3173 | "}"); | |
3174 | return ret; | |
3175 | } | |
3176 | ||
3177 | /* | |
3178 | * Must be called with sessions_mutex held. | |
3179 | */ | |
3180 | static | |
8cdc1a81 | 3181 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3182 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3183 | size_t nesting, |
3184 | const char *prev_field_name) | |
65c85aa6 MD |
3185 | { |
3186 | int ret; | |
3187 | ||
3188 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3189 | lttng_kernel_get_type_variant(field->type), nesting, |
3190 | prev_field_name); | |
65c85aa6 MD |
3191 | if (ret) |
3192 | return ret; | |
ceabb767 | 3193 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3194 | } |
3195 | ||
f513b2bf MD |
3196 | /* |
3197 | * Must be called with sessions_mutex held. | |
3198 | */ | |
3199 | static | |
8cdc1a81 | 3200 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3201 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3202 | size_t nesting) |
3203 | { | |
3204 | int ret; | |
437d5aa5 MD |
3205 | const struct lttng_kernel_type_array *array_type; |
3206 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3207 | |
437d5aa5 MD |
3208 | array_type = lttng_kernel_get_type_array(field->type); |
3209 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3210 | |
437d5aa5 | 3211 | if (array_type->alignment) { |
ceabb767 | 3212 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3213 | if (ret) |
3214 | return ret; | |
ceabb767 MD |
3215 | ret = lttng_metadata_printf(session, |
3216 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3217 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3218 | field->name); |
3219 | if (ret) | |
3220 | return ret; | |
3221 | } | |
3222 | /* | |
3223 | * Nested compound types: Only array of structures and variants are | |
3224 | * currently supported. | |
3225 | */ | |
437d5aa5 | 3226 | elem_type = array_type->elem_type; |
12bb2edb MD |
3227 | switch (elem_type->type) { |
3228 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3229 | case lttng_kernel_type_struct: |
3230 | case lttng_kernel_type_variant: | |
3231 | ret = _lttng_type_statedump(session, elem_type, | |
3232 | array_type->encoding, nesting); | |
65c85aa6 MD |
3233 | if (ret) |
3234 | return ret; | |
3235 | break; | |
ceabb767 | 3236 | |
f513b2bf MD |
3237 | default: |
3238 | return -EINVAL; | |
3239 | } | |
3240 | ret = lttng_metadata_printf(session, | |
3241 | " _%s[%u];\n", | |
3242 | field->name, | |
437d5aa5 | 3243 | array_type->length); |
f513b2bf MD |
3244 | return ret; |
3245 | } | |
3246 | ||
3247 | /* | |
3248 | * Must be called with sessions_mutex held. | |
3249 | */ | |
3250 | static | |
8cdc1a81 | 3251 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3252 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3253 | size_t nesting, |
3254 | const char *prev_field_name) | |
f513b2bf MD |
3255 | { |
3256 | int ret; | |
3257 | const char *length_name; | |
437d5aa5 MD |
3258 | const struct lttng_kernel_type_sequence *sequence_type; |
3259 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3260 | |
437d5aa5 MD |
3261 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3262 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3263 | |
437d5aa5 | 3264 | length_name = sequence_type->length_name; |
51ef4536 MD |
3265 | if (!length_name) |
3266 | length_name = prev_field_name; | |
3267 | if (!length_name) | |
3268 | return -EINVAL; | |
ceabb767 | 3269 | |
437d5aa5 | 3270 | if (sequence_type->alignment) { |
ceabb767 | 3271 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3272 | if (ret) |
3273 | return ret; | |
ceabb767 MD |
3274 | ret = lttng_metadata_printf(session, |
3275 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3276 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3277 | field->name); |
3278 | if (ret) | |
3279 | return ret; | |
3280 | } | |
3281 | ||
3282 | /* | |
3283 | * Nested compound types: Only array of structures and variants are | |
3284 | * currently supported. | |
3285 | */ | |
437d5aa5 | 3286 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3287 | switch (elem_type->type) { |
3288 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3289 | case lttng_kernel_type_struct: |
3290 | case lttng_kernel_type_variant: | |
3291 | ret = _lttng_type_statedump(session, elem_type, | |
3292 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3293 | if (ret) |
3294 | return ret; | |
3295 | break; | |
ceabb767 | 3296 | |
f513b2bf MD |
3297 | default: |
3298 | return -EINVAL; | |
3299 | } | |
3300 | ret = lttng_metadata_printf(session, | |
3301 | " _%s[ _%s ];\n", | |
3302 | field->name, | |
51ef4536 | 3303 | length_name); |
f513b2bf MD |
3304 | return ret; |
3305 | } | |
3306 | ||
141ddf28 MD |
3307 | /* |
3308 | * Must be called with sessions_mutex held. | |
3309 | */ | |
3310 | static | |
8cdc1a81 | 3311 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3312 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3313 | size_t nesting) |
3314 | { | |
d96a4a7a | 3315 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3316 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3317 | int ret; |
3318 | unsigned int i, nr_entries; | |
3319 | ||
437d5aa5 | 3320 | container_type = type->container_type; |
12bb2edb | 3321 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3322 | ret = -EINVAL; |
3323 | goto end; | |
3324 | } | |
437d5aa5 | 3325 | enum_desc = type->desc; |
141ddf28 MD |
3326 | nr_entries = enum_desc->nr_entries; |
3327 | ||
3328 | ret = print_tabs(session, nesting); | |
3329 | if (ret) | |
3330 | goto end; | |
ceabb767 MD |
3331 | ret = lttng_metadata_printf(session, "enum : "); |
3332 | if (ret) | |
3333 | goto end; | |
437d5aa5 MD |
3334 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3335 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3336 | if (ret) |
ceabb767 MD |
3337 | goto end; |
3338 | ret = lttng_metadata_printf(session, " {\n"); | |
3339 | if (ret) | |
3340 | goto end; | |
141ddf28 MD |
3341 | /* Dump all entries */ |
3342 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3343 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3344 | int j, len; |
3345 | ||
3346 | ret = print_tabs(session, nesting + 1); | |
3347 | if (ret) | |
3348 | goto end; | |
3349 | ret = lttng_metadata_printf(session, | |
3350 | "\""); | |
3351 | if (ret) | |
3352 | goto end; | |
3353 | len = strlen(entry->string); | |
3354 | /* Escape the character '"' */ | |
3355 | for (j = 0; j < len; j++) { | |
3356 | char c = entry->string[j]; | |
3357 | ||
3358 | switch (c) { | |
3359 | case '"': | |
3360 | ret = lttng_metadata_printf(session, | |
3361 | "\\\""); | |
3362 | break; | |
3363 | case '\\': | |
3364 | ret = lttng_metadata_printf(session, | |
3365 | "\\\\"); | |
3366 | break; | |
3367 | default: | |
3368 | ret = lttng_metadata_printf(session, | |
3369 | "%c", c); | |
3370 | break; | |
3371 | } | |
3372 | if (ret) | |
3373 | goto end; | |
3374 | } | |
08ad1061 PP |
3375 | ret = lttng_metadata_printf(session, "\""); |
3376 | if (ret) | |
3377 | goto end; | |
3378 | ||
3379 | if (entry->options.is_auto) { | |
3380 | ret = lttng_metadata_printf(session, ",\n"); | |
3381 | if (ret) | |
3382 | goto end; | |
141ddf28 | 3383 | } else { |
7c559490 MD |
3384 | ret = lttng_metadata_printf(session, |
3385 | " = "); | |
3386 | if (ret) | |
3387 | goto end; | |
3388 | if (entry->start.signedness) | |
141ddf28 | 3389 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3390 | "%lld", (long long) entry->start.value); |
3391 | else | |
3392 | ret = lttng_metadata_printf(session, | |
3393 | "%llu", entry->start.value); | |
3394 | if (ret) | |
3395 | goto end; | |
3396 | if (entry->start.signedness == entry->end.signedness && | |
3397 | entry->start.value | |
3398 | == entry->end.value) { | |
141ddf28 | 3399 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3400 | ",\n"); |
3401 | } else { | |
3402 | if (entry->end.signedness) { | |
3403 | ret = lttng_metadata_printf(session, | |
3404 | " ... %lld,\n", | |
3405 | (long long) entry->end.value); | |
3406 | } else { | |
3407 | ret = lttng_metadata_printf(session, | |
3408 | " ... %llu,\n", | |
3409 | entry->end.value); | |
3410 | } | |
141ddf28 | 3411 | } |
7c559490 MD |
3412 | if (ret) |
3413 | goto end; | |
141ddf28 | 3414 | } |
141ddf28 MD |
3415 | } |
3416 | ret = print_tabs(session, nesting); | |
3417 | if (ret) | |
3418 | goto end; | |
ceabb767 | 3419 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3420 | end: |
3421 | return ret; | |
3422 | } | |
3423 | ||
d83004aa JD |
3424 | /* |
3425 | * Must be called with sessions_mutex held. | |
3426 | */ | |
c099397a | 3427 | static |
8cdc1a81 | 3428 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3429 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3430 | size_t nesting) |
3431 | { | |
3432 | int ret; | |
437d5aa5 | 3433 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3434 | |
437d5aa5 MD |
3435 | enum_type = lttng_kernel_get_type_enum(field->type); |
3436 | WARN_ON_ONCE(!enum_type); | |
3437 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3438 | if (ret) |
3439 | return ret; | |
3440 | return lttng_field_name_statedump(session, field, nesting); | |
3441 | } | |
3442 | ||
3443 | static | |
8cdc1a81 | 3444 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3445 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3446 | size_t nesting) |
3447 | { | |
3448 | int ret; | |
3449 | ||
437d5aa5 MD |
3450 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3451 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3452 | if (ret) |
3453 | return ret; | |
3454 | return lttng_field_name_statedump(session, field, nesting); | |
3455 | } | |
3456 | ||
3457 | static | |
8cdc1a81 | 3458 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3459 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3460 | size_t nesting) |
3461 | { | |
3462 | int ret; | |
3463 | ||
ceabb767 MD |
3464 | /* Default encoding is UTF8 */ |
3465 | ret = print_tabs(session, nesting); | |
3466 | if (ret) | |
3467 | return ret; | |
3468 | ret = lttng_metadata_printf(session, | |
3469 | "string%s", | |
437d5aa5 | 3470 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3471 | " { encoding = ASCII; }" : ""); |
3472 | return ret; | |
3473 | } | |
3474 | ||
3475 | static | |
8cdc1a81 | 3476 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3477 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3478 | size_t nesting) |
ceabb767 | 3479 | { |
437d5aa5 | 3480 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3481 | int ret; |
3482 | ||
437d5aa5 MD |
3483 | string_type = lttng_kernel_get_type_string(field->type); |
3484 | WARN_ON_ONCE(!string_type); | |
3485 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3486 | if (ret) |
3487 | return ret; | |
3488 | return lttng_field_name_statedump(session, field, nesting); | |
3489 | } | |
3490 | ||
3491 | /* | |
3492 | * Must be called with sessions_mutex held. | |
3493 | */ | |
3494 | static | |
8cdc1a81 | 3495 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3496 | const struct lttng_kernel_type_common *type, |
3497 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3498 | size_t nesting) |
c099397a | 3499 | { |
c099397a | 3500 | int ret = 0; |
c099397a | 3501 | |
12bb2edb MD |
3502 | switch (type->type) { |
3503 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3504 | ret = _lttng_integer_type_statedump(session, |
3505 | lttng_kernel_get_type_integer(type), | |
3506 | parent_encoding, nesting); | |
8070f5c0 | 3507 | break; |
437d5aa5 MD |
3508 | case lttng_kernel_type_enum: |
3509 | ret = _lttng_enum_type_statedump(session, | |
3510 | lttng_kernel_get_type_enum(type), | |
3511 | nesting); | |
8070f5c0 | 3512 | break; |
12bb2edb | 3513 | case lttng_kernel_type_string: |
437d5aa5 MD |
3514 | ret = _lttng_string_type_statedump(session, |
3515 | lttng_kernel_get_type_string(type), | |
3516 | nesting); | |
ceabb767 | 3517 | break; |
437d5aa5 MD |
3518 | case lttng_kernel_type_struct: |
3519 | ret = _lttng_struct_type_statedump(session, | |
3520 | lttng_kernel_get_type_struct(type), | |
3521 | nesting); | |
8070f5c0 | 3522 | break; |
437d5aa5 MD |
3523 | case lttng_kernel_type_variant: |
3524 | ret = _lttng_variant_type_statedump(session, | |
3525 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3526 | nesting, NULL); |
ceabb767 MD |
3527 | break; |
3528 | ||
3529 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3530 | case lttng_kernel_type_array: |
3531 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3532 | default: |
3533 | WARN_ON_ONCE(1); | |
3534 | return -EINVAL; | |
8070f5c0 | 3535 | } |
ceabb767 MD |
3536 | return ret; |
3537 | } | |
8070f5c0 | 3538 | |
ceabb767 MD |
3539 | /* |
3540 | * Must be called with sessions_mutex held. | |
3541 | */ | |
3542 | static | |
8cdc1a81 | 3543 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3544 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3545 | size_t nesting, |
3546 | const char **prev_field_name_p) | |
ceabb767 | 3547 | { |
51ef4536 | 3548 | const char *prev_field_name = NULL; |
ceabb767 | 3549 | int ret = 0; |
27d2368e | 3550 | |
51ef4536 MD |
3551 | if (prev_field_name_p) |
3552 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3553 | switch (field->type->type) { |
12bb2edb | 3554 | case lttng_kernel_type_integer: |
ceabb767 MD |
3555 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3556 | break; | |
437d5aa5 | 3557 | case lttng_kernel_type_enum: |
ceabb767 | 3558 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3559 | break; |
12bb2edb | 3560 | case lttng_kernel_type_string: |
ceabb767 | 3561 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3562 | break; |
437d5aa5 | 3563 | case lttng_kernel_type_struct: |
ceabb767 | 3564 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3565 | break; |
437d5aa5 | 3566 | case lttng_kernel_type_array: |
ceabb767 | 3567 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3568 | break; |
437d5aa5 | 3569 | case lttng_kernel_type_sequence: |
51ef4536 | 3570 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3571 | break; |
437d5aa5 | 3572 | case lttng_kernel_type_variant: |
51ef4536 | 3573 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3574 | break; |
f513b2bf | 3575 | |
8070f5c0 MD |
3576 | default: |
3577 | WARN_ON_ONCE(1); | |
3578 | return -EINVAL; | |
3579 | } | |
51ef4536 MD |
3580 | if (prev_field_name_p) |
3581 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3582 | return ret; |
3583 | } | |
3584 | ||
3585 | static | |
8cdc1a81 | 3586 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3587 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3588 | { |
51ef4536 | 3589 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3590 | int ret = 0; |
3591 | int i; | |
3592 | ||
3593 | if (!ctx) | |
3594 | return 0; | |
3595 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3596 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3597 | |
51ef4536 | 3598 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3599 | if (ret) |
3600 | return ret; | |
3601 | } | |
3602 | return ret; | |
3603 | } | |
3604 | ||
3605 | static | |
8cdc1a81 | 3606 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3607 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3608 | { |
51ef4536 | 3609 | const char *prev_field_name = NULL; |
a67ba386 | 3610 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3611 | int ret = 0; |
3612 | int i; | |
3613 | ||
6c8c025b MD |
3614 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3615 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3616 | |
51ef4536 | 3617 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3618 | if (ret) |
3619 | return ret; | |
c099397a MD |
3620 | } |
3621 | return ret; | |
3622 | } | |
3623 | ||
d83004aa JD |
3624 | /* |
3625 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3626 | * The entire event metadata is printed as a single atomic metadata |
3627 | * transaction. | |
d83004aa | 3628 | */ |
c099397a | 3629 | static |
8cdc1a81 | 3630 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3631 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3632 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3633 | { |
3634 | int ret = 0; | |
3635 | ||
a67ba386 | 3636 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3637 | return 0; |
f7d06400 | 3638 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3639 | return 0; |
3640 | ||
8b97fd42 MD |
3641 | lttng_metadata_begin(session); |
3642 | ||
c099397a MD |
3643 | ret = lttng_metadata_printf(session, |
3644 | "event {\n" | |
ae734547 | 3645 | " name = \"%s\";\n" |
c099397a | 3646 | " id = %u;\n" |
b9074a1b | 3647 | " stream_id = %u;\n", |
a67ba386 MD |
3648 | event_recorder->priv->parent.desc->event_name, |
3649 | event_recorder->priv->id, | |
f7d06400 | 3650 | event_recorder->chan->priv->id); |
c099397a MD |
3651 | if (ret) |
3652 | goto end; | |
3653 | ||
8070f5c0 | 3654 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3655 | " fields := struct {\n" |
3656 | ); | |
3657 | if (ret) | |
3658 | goto end; | |
3659 | ||
a67ba386 | 3660 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3661 | if (ret) |
3662 | goto end; | |
3663 | ||
3664 | /* | |
3665 | * LTTng space reservation can only reserve multiples of the | |
3666 | * byte size. | |
3667 | */ | |
3668 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3669 | " };\n" |
3670 | "};\n\n"); | |
c099397a MD |
3671 | if (ret) |
3672 | goto end; | |
3673 | ||
a67ba386 | 3674 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3675 | end: |
8b97fd42 | 3676 | lttng_metadata_end(session); |
c099397a MD |
3677 | return ret; |
3678 | ||
3679 | } | |
3680 | ||
d83004aa JD |
3681 | /* |
3682 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3683 | * The entire channel metadata is printed as a single atomic metadata |
3684 | * transaction. | |
d83004aa | 3685 | */ |
c099397a | 3686 | static |
8cdc1a81 | 3687 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3688 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3689 | { |
3690 | int ret = 0; | |
3691 | ||
f7d06400 | 3692 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3693 | return 0; |
d83004aa | 3694 | |
f7d06400 | 3695 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3696 | return 0; |
3697 | ||
8b97fd42 MD |
3698 | lttng_metadata_begin(session); |
3699 | ||
f7d06400 | 3700 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3701 | ret = lttng_metadata_printf(session, |
3702 | "stream {\n" | |
3703 | " id = %u;\n" | |
9115fbdc | 3704 | " event.header := %s;\n" |
b9074a1b | 3705 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3706 | chan->priv->id, |
3707 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3708 | "struct event_header_large"); |
3709 | if (ret) | |
3710 | goto end; | |
3711 | ||
f7d06400 | 3712 | if (chan->priv->ctx) { |
b9074a1b MD |
3713 | ret = lttng_metadata_printf(session, |
3714 | " event.context := struct {\n"); | |
3715 | if (ret) | |
3716 | goto end; | |
3717 | } | |
f7d06400 | 3718 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3719 | if (ret) |
3720 | goto end; | |
f7d06400 | 3721 | if (chan->priv->ctx) { |
b9074a1b MD |
3722 | ret = lttng_metadata_printf(session, |
3723 | " };\n"); | |
3724 | if (ret) | |
3725 | goto end; | |
3726 | } | |
8070f5c0 MD |
3727 | |
3728 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3729 | "};\n\n"); |
8070f5c0 | 3730 | |
f7d06400 | 3731 | chan->priv->metadata_dumped = 1; |
c099397a | 3732 | end: |
8b97fd42 | 3733 | lttng_metadata_end(session); |
c099397a MD |
3734 | return ret; |
3735 | } | |
3736 | ||
d83004aa JD |
3737 | /* |
3738 | * Must be called with sessions_mutex held. | |
3739 | */ | |
9115fbdc | 3740 | static |
8cdc1a81 | 3741 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3742 | { |
3743 | return lttng_metadata_printf(session, | |
3744 | "struct packet_context {\n" | |
a3ccff4f MD |
3745 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3746 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3747 | " uint64_t content_size;\n" |
3748 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3749 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3750 | " unsigned long events_discarded;\n" |
9115fbdc | 3751 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3752 | "};\n\n" |
9115fbdc MD |
3753 | ); |
3754 | } | |
3755 | ||
3756 | /* | |
3757 | * Compact header: | |
3758 | * id: range: 0 - 30. | |
3759 | * id 31 is reserved to indicate an extended header. | |
3760 | * | |
3761 | * Large header: | |
3762 | * id: range: 0 - 65534. | |
3763 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3764 | * |
3765 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3766 | */ |
3767 | static | |
8cdc1a81 | 3768 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3769 | { |
3770 | return lttng_metadata_printf(session, | |
3771 | "struct event_header_compact {\n" | |
3772 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3773 | " variant <id> {\n" | |
3774 | " struct {\n" | |
a3ccff4f | 3775 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3776 | " } compact;\n" |
3777 | " struct {\n" | |
3778 | " uint32_t id;\n" | |
a3ccff4f | 3779 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3780 | " } extended;\n" |
3781 | " } v;\n" | |
3782 | "} align(%u);\n" | |
3783 | "\n" | |
3784 | "struct event_header_large {\n" | |
3785 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3786 | " variant <id> {\n" | |
3787 | " struct {\n" | |
a3ccff4f | 3788 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3789 | " } compact;\n" |
3790 | " struct {\n" | |
3791 | " uint32_t id;\n" | |
a3ccff4f | 3792 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3793 | " } extended;\n" |
3794 | " } v;\n" | |
3795 | "} align(%u);\n\n", | |
a90917c3 MD |
3796 | lttng_alignof(uint32_t) * CHAR_BIT, |
3797 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3798 | ); |
3799 | } | |
3800 | ||
a3ccff4f MD |
3801 | /* |
3802 | * Approximation of NTP time of day to clock monotonic correlation, | |
3803 | * taken at start of trace. | |
3804 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3805 | * in future versions. | |
5283350b MD |
3806 | * This function may return a negative offset. It may happen if the |
3807 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3808 | * |
3809 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3810 | * y2038 compliant. | |
a3ccff4f MD |
3811 | */ |
3812 | static | |
8967b2a3 | 3813 | int64_t measure_clock_offset(void) |
a3ccff4f | 3814 | { |
dcb93448 | 3815 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3816 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3817 | int64_t offset; |
a3ccff4f | 3818 | unsigned long flags; |
3636085f MJ |
3819 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3820 | struct timespec64 rts = { 0, 0 }; | |
3821 | #else | |
3822 | struct timespec rts = { 0, 0 }; | |
3823 | #endif | |
a3ccff4f MD |
3824 | |
3825 | /* Disable interrupts to increase correlation precision. */ | |
3826 | local_irq_save(flags); | |
3827 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3828 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3829 | ktime_get_real_ts64(&rts); | |
3830 | #else | |
216b6baa | 3831 | getnstimeofday(&rts); |
3636085f | 3832 | #endif |
a3ccff4f MD |
3833 | monotonic[1] = trace_clock_read64(); |
3834 | local_irq_restore(flags); | |
3835 | ||
dcb93448 | 3836 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3837 | realtime = (uint64_t) rts.tv_sec * tcf; |
3838 | if (tcf == NSEC_PER_SEC) { | |
3839 | realtime += rts.tv_nsec; | |
3840 | } else { | |
3841 | uint64_t n = rts.tv_nsec * tcf; | |
3842 | ||
3843 | do_div(n, NSEC_PER_SEC); | |
3844 | realtime += n; | |
3845 | } | |
dcb93448 | 3846 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3847 | return offset; |
3848 | } | |
3849 | ||
3eb95be4 | 3850 | static |
8cdc1a81 | 3851 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3852 | { |
0f3eaad4 | 3853 | int ret = 0; |
3eb95be4 JR |
3854 | size_t i; |
3855 | char cur; | |
3856 | ||
3857 | i = 0; | |
3858 | cur = string[i]; | |
3859 | while (cur != '\0') { | |
3860 | switch (cur) { | |
3861 | case '\n': | |
3862 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3863 | break; | |
3864 | case '\\': | |
3865 | case '"': | |
3866 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3867 | if (ret) | |
3868 | goto error; | |
3869 | /* We still print the current char */ | |
c190d76e | 3870 | lttng_fallthrough; |
3eb95be4 JR |
3871 | default: |
3872 | ret = lttng_metadata_printf(session, "%c", cur); | |
3873 | break; | |
3874 | } | |
3875 | ||
3876 | if (ret) | |
3877 | goto error; | |
3878 | ||
3879 | cur = string[++i]; | |
3880 | } | |
3881 | error: | |
3882 | return ret; | |
3883 | } | |
3884 | ||
3885 | static | |
8cdc1a81 | 3886 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3887 | const char *field_value) |
3eb95be4 JR |
3888 | { |
3889 | int ret; | |
3890 | ||
1c88f269 | 3891 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3892 | if (ret) |
3893 | goto error; | |
3894 | ||
1c88f269 | 3895 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3896 | if (ret) |
3897 | goto error; | |
3898 | ||
3899 | ret = lttng_metadata_printf(session, "\";\n"); | |
3900 | ||
3901 | error: | |
3902 | return ret; | |
3903 | } | |
3904 | ||
c099397a MD |
3905 | /* |
3906 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3907 | * Must be called with sessions_mutex held. |
c099397a MD |
3908 | */ |
3909 | static | |
8cdc1a81 | 3910 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3911 | { |
8cdc1a81 | 3912 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3913 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3914 | const char *product_uuid; |
f7d06400 | 3915 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3916 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3917 | int ret = 0; |
3918 | ||
585e5dcc | 3919 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3920 | return 0; |
8b97fd42 MD |
3921 | |
3922 | lttng_metadata_begin(session); | |
3923 | ||
8cdc1a81 | 3924 | if (session->priv->metadata_dumped) |
c099397a | 3925 | goto skip_session; |
c099397a | 3926 | |
d793d5e1 | 3927 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3928 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3929 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3930 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3931 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3932 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3933 | |
3934 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3935 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3936 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3937 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3938 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3939 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3940 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3941 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3942 | "\n" |
3943 | "trace {\n" | |
3944 | " major = %u;\n" | |
3945 | " minor = %u;\n" | |
30bdb6e4 | 3946 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3947 | " byte_order = %s;\n" |
3948 | " packet.header := struct {\n" | |
3949 | " uint32_t magic;\n" | |
1ec3f75a | 3950 | " uint8_t uuid[16];\n" |
d793d5e1 | 3951 | " uint32_t stream_id;\n" |
5594698f | 3952 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3953 | " };\n" |
d793d5e1 | 3954 | "};\n\n", |
a90917c3 MD |
3955 | lttng_alignof(uint8_t) * CHAR_BIT, |
3956 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3957 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3958 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3959 | sizeof(unsigned long) * CHAR_BIT, |
3960 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3961 | CTF_SPEC_MAJOR, |
3962 | CTF_SPEC_MINOR, | |
d793d5e1 | 3963 | uuid_s, |
5214fa50 | 3964 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3965 | "be" |
3966 | #else | |
3967 | "le" | |
3968 | #endif | |
3969 | ); | |
3970 | if (ret) | |
3971 | goto end; | |
3972 | ||
99dc9597 MD |
3973 | ret = lttng_metadata_printf(session, |
3974 | "env {\n" | |
a6058143 | 3975 | " hostname = \"%s\";\n" |
c6c9e10f | 3976 | " domain = \"kernel\";\n" |
99dc9597 | 3977 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3978 | " kernel_release = \"%s\";\n" |
3979 | " kernel_version = \"%s\";\n" | |
3980 | " tracer_name = \"lttng-modules\";\n" | |
3981 | " tracer_major = %d;\n" | |
3982 | " tracer_minor = %d;\n" | |
3983 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3984 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3985 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3986 | utsname()->sysname, |
3987 | utsname()->release, | |
c6c9e10f MD |
3988 | utsname()->version, |
3989 | LTTNG_MODULES_MAJOR_VERSION, | |
3990 | LTTNG_MODULES_MINOR_VERSION, | |
3991 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3992 | ); |
3993 | if (ret) | |
3994 | goto end; | |
3995 | ||
8cdc1a81 | 3996 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
3997 | if (ret) |
3998 | goto end; | |
3999 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 4000 | session->priv->creation_time); |
3eb95be4 JR |
4001 | if (ret) |
4002 | goto end; | |
4003 | ||
c88f762e GB |
4004 | /* Add the product UUID to the 'env' section */ |
4005 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4006 | if (product_uuid) { | |
4007 | ret = lttng_metadata_printf(session, | |
4008 | " product_uuid = \"%s\";\n", | |
4009 | product_uuid | |
4010 | ); | |
4011 | if (ret) | |
4012 | goto end; | |
4013 | } | |
4014 | ||
4015 | /* Close the 'env' section */ | |
3eb95be4 JR |
4016 | ret = lttng_metadata_printf(session, "};\n\n"); |
4017 | if (ret) | |
4018 | goto end; | |
4019 | ||
a3ccff4f MD |
4020 | ret = lttng_metadata_printf(session, |
4021 | "clock {\n" | |
2754583e MD |
4022 | " name = \"%s\";\n", |
4023 | trace_clock_name() | |
a82c63f1 MD |
4024 | ); |
4025 | if (ret) | |
4026 | goto end; | |
4027 | ||
4028 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4029 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4030 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4031 | clock_uuid_s |
4032 | ); | |
4033 | if (ret) | |
4034 | goto end; | |
4035 | } | |
4036 | ||
4037 | ret = lttng_metadata_printf(session, | |
2754583e | 4038 | " description = \"%s\";\n" |
a3ccff4f MD |
4039 | " freq = %llu; /* Frequency, in Hz */\n" |
4040 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4041 | " offset = %lld;\n" |
a3ccff4f | 4042 | "};\n\n", |
2754583e | 4043 | trace_clock_description(), |
a3ccff4f | 4044 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4045 | (long long) measure_clock_offset() |
a3ccff4f MD |
4046 | ); |
4047 | if (ret) | |
4048 | goto end; | |
4049 | ||
4050 | ret = lttng_metadata_printf(session, | |
4051 | "typealias integer {\n" | |
4052 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4053 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4054 | "} := uint27_clock_monotonic_t;\n" |
4055 | "\n" | |
4056 | "typealias integer {\n" | |
4057 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4058 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4059 | "} := uint32_clock_monotonic_t;\n" |
4060 | "\n" | |
4061 | "typealias integer {\n" | |
4062 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4063 | " map = clock.%s.value;\n" |
a3ccff4f | 4064 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4065 | trace_clock_name(), |
a3ccff4f | 4066 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4067 | trace_clock_name(), |
4068 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4069 | trace_clock_name() | |
a3ccff4f MD |
4070 | ); |
4071 | if (ret) | |
4072 | goto end; | |
4073 | ||
a90917c3 | 4074 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4075 | if (ret) |
4076 | goto end; | |
4077 | ||
a90917c3 | 4078 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4079 | if (ret) |
4080 | goto end; | |
4081 | ||
c099397a | 4082 | skip_session: |
f7d06400 MD |
4083 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4084 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4085 | if (ret) |
4086 | goto end; | |
4087 | } | |
4088 | ||
8cdc1a81 | 4089 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4090 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4091 | event_recorder_priv->pub); | |
c099397a MD |
4092 | if (ret) |
4093 | goto end; | |
4094 | } | |
8cdc1a81 | 4095 | session->priv->metadata_dumped = 1; |
c099397a | 4096 | end: |
8b97fd42 | 4097 | lttng_metadata_end(session); |
c099397a MD |
4098 | return ret; |
4099 | } | |
4100 | ||
c0e31d2e | 4101 | /** |
a90917c3 | 4102 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4103 | * @transport: transport structure |
4104 | * | |
4105 | * Registers a transport which can be used as output to extract the data out of | |
4106 | * LTTng. The module calling this registration function must ensure that no | |
4107 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4108 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4109 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4110 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4111 | * after its registration must it synchronize the TLBs. |
4112 | */ | |
a90917c3 | 4113 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4114 | { |
4115 | /* | |
4116 | * Make sure no page fault can be triggered by the module about to be | |
4117 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4118 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4119 | */ |
263b6c88 | 4120 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4121 | |
4122 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4123 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4124 | mutex_unlock(&sessions_mutex); |
4125 | } | |
a90917c3 | 4126 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4127 | |
4128 | /** | |
a90917c3 | 4129 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4130 | * @transport: transport structure |
4131 | */ | |
a90917c3 | 4132 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4133 | { |
4134 | mutex_lock(&sessions_mutex); | |
4135 | list_del(&transport->node); | |
4136 | mutex_unlock(&sessions_mutex); | |
4137 | } | |
a90917c3 | 4138 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4139 | |
a101fa10 MD |
4140 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4141 | { | |
4142 | /* | |
4143 | * Make sure no page fault can be triggered by the module about to be | |
4144 | * registered. We deal with this here so we don't have to call | |
4145 | * vmalloc_sync_mappings() in each module's init. | |
4146 | */ | |
4147 | wrapper_vmalloc_sync_mappings(); | |
4148 | ||
4149 | mutex_lock(&sessions_mutex); | |
4150 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4151 | mutex_unlock(&sessions_mutex); | |
4152 | } | |
4153 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4154 | ||
4155 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4156 | { | |
4157 | mutex_lock(&sessions_mutex); | |
4158 | list_del(&transport->node); | |
4159 | mutex_unlock(&sessions_mutex); | |
4160 | } | |
4161 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4162 | ||
5f4c791e | 4163 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4164 | |
4165 | enum cpuhp_state lttng_hp_prepare; | |
4166 | enum cpuhp_state lttng_hp_online; | |
4167 | ||
4168 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4169 | { | |
4170 | struct lttng_cpuhp_node *lttng_node; | |
4171 | ||
4172 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4173 | switch (lttng_node->component) { | |
4174 | case LTTNG_RING_BUFFER_FRONTEND: | |
4175 | return 0; | |
4176 | case LTTNG_RING_BUFFER_BACKEND: | |
4177 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4178 | case LTTNG_RING_BUFFER_ITER: | |
4179 | return 0; | |
4180 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4181 | return 0; | |
4182 | default: | |
4183 | return -EINVAL; | |
4184 | } | |
4185 | } | |
4186 | ||
4187 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4188 | { | |
4189 | struct lttng_cpuhp_node *lttng_node; | |
4190 | ||
4191 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4192 | switch (lttng_node->component) { | |
4193 | case LTTNG_RING_BUFFER_FRONTEND: | |
4194 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4195 | case LTTNG_RING_BUFFER_BACKEND: | |
4196 | return 0; | |
4197 | case LTTNG_RING_BUFFER_ITER: | |
4198 | return 0; | |
4199 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4200 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4201 | default: | |
4202 | return -EINVAL; | |
4203 | } | |
4204 | } | |
4205 | ||
4206 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4207 | { | |
4208 | struct lttng_cpuhp_node *lttng_node; | |
4209 | ||
4210 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4211 | switch (lttng_node->component) { | |
4212 | case LTTNG_RING_BUFFER_FRONTEND: | |
4213 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4214 | case LTTNG_RING_BUFFER_BACKEND: | |
4215 | return 0; | |
4216 | case LTTNG_RING_BUFFER_ITER: | |
4217 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4218 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4219 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4220 | default: | |
4221 | return -EINVAL; | |
4222 | } | |
4223 | } | |
4224 | ||
4225 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4226 | { | |
4227 | struct lttng_cpuhp_node *lttng_node; | |
4228 | ||
4229 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4230 | switch (lttng_node->component) { | |
4231 | case LTTNG_RING_BUFFER_FRONTEND: | |
4232 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4233 | case LTTNG_RING_BUFFER_BACKEND: | |
4234 | return 0; | |
4235 | case LTTNG_RING_BUFFER_ITER: | |
4236 | return 0; | |
4237 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4238 | return 0; | |
4239 | default: | |
4240 | return -EINVAL; | |
4241 | } | |
4242 | } | |
4243 | ||
4244 | static int __init lttng_init_cpu_hotplug(void) | |
4245 | { | |
4246 | int ret; | |
4247 | ||
4248 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4249 | lttng_hotplug_prepare, | |
4250 | lttng_hotplug_dead); | |
4251 | if (ret < 0) { | |
4252 | return ret; | |
4253 | } | |
4254 | lttng_hp_prepare = ret; | |
4255 | lttng_rb_set_hp_prepare(ret); | |
4256 | ||
4257 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4258 | lttng_hotplug_online, | |
4259 | lttng_hotplug_offline); | |
4260 | if (ret < 0) { | |
4261 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4262 | lttng_hp_prepare = 0; | |
4263 | return ret; | |
4264 | } | |
4265 | lttng_hp_online = ret; | |
4266 | lttng_rb_set_hp_online(ret); | |
4267 | ||
4268 | return 0; | |
4269 | } | |
4270 | ||
4271 | static void __exit lttng_exit_cpu_hotplug(void) | |
4272 | { | |
4273 | lttng_rb_set_hp_online(0); | |
4274 | cpuhp_remove_multi_state(lttng_hp_online); | |
4275 | lttng_rb_set_hp_prepare(0); | |
4276 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4277 | } | |
4278 | ||
5f4c791e | 4279 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4280 | static int lttng_init_cpu_hotplug(void) |
4281 | { | |
4282 | return 0; | |
4283 | } | |
4284 | static void lttng_exit_cpu_hotplug(void) | |
4285 | { | |
4286 | } | |
5f4c791e | 4287 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4288 | |
a90917c3 | 4289 | static int __init lttng_events_init(void) |
4e3c1b9b | 4290 | { |
1c25284c MD |
4291 | int ret; |
4292 | ||
453b2495 JD |
4293 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4294 | if (ret) | |
4295 | return ret; | |
389d7070 | 4296 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4297 | if (ret) |
4298 | return ret; | |
4299 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4300 | if (ret) |
4301 | return ret; | |
4302 | ret = lttng_probes_init(); | |
389d7070 MD |
4303 | if (ret) |
4304 | return ret; | |
07dfc1d0 | 4305 | ret = lttng_context_init(); |
20591cf7 MD |
4306 | if (ret) |
4307 | return ret; | |
07dfc1d0 MD |
4308 | ret = lttng_tracepoint_init(); |
4309 | if (ret) | |
4310 | goto error_tp; | |
a67ba386 MD |
4311 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4312 | if (!event_recorder_cache) { | |
20591cf7 | 4313 | ret = -ENOMEM; |
a67ba386 | 4314 | goto error_kmem_event_recorder; |
dffef45d | 4315 | } |
a67ba386 MD |
4316 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4317 | if (!event_recorder_private_cache) { | |
4318 | ret = -ENOMEM; | |
4319 | goto error_kmem_event_recorder_private; | |
4320 | } | |
4321 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4322 | if (!event_notifier_cache) { |
4323 | ret = -ENOMEM; | |
4324 | goto error_kmem_event_notifier; | |
20591cf7 | 4325 | } |
a67ba386 MD |
4326 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4327 | if (!event_notifier_private_cache) { | |
4328 | ret = -ENOMEM; | |
4329 | goto error_kmem_event_notifier_private; | |
4330 | } | |
80996790 | 4331 | ret = lttng_abi_init(); |
02119ee5 MD |
4332 | if (ret) |
4333 | goto error_abi; | |
0c956676 MD |
4334 | ret = lttng_logger_init(); |
4335 | if (ret) | |
4336 | goto error_logger; | |
1e367326 MD |
4337 | ret = lttng_init_cpu_hotplug(); |
4338 | if (ret) | |
4339 | goto error_hotplug; | |
101215b7 | 4340 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4341 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4342 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4343 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4344 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4345 | LTTNG_VERSION_NAME, |
4346 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4347 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4348 | #else | |
4349 | "", | |
4350 | #endif | |
4351 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4352 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4353 | #else | |
4354 | ""); | |
4355 | #endif | |
c1551e57 MJ |
4356 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4357 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4358 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4359 | return 0; |
0c956676 | 4360 | |
1e367326 MD |
4361 | error_hotplug: |
4362 | lttng_logger_exit(); | |
0c956676 MD |
4363 | error_logger: |
4364 | lttng_abi_exit(); | |
02119ee5 | 4365 | error_abi: |
a67ba386 MD |
4366 | kmem_cache_destroy(event_notifier_private_cache); |
4367 | error_kmem_event_notifier_private: | |
dffef45d FD |
4368 | kmem_cache_destroy(event_notifier_cache); |
4369 | error_kmem_event_notifier: | |
a67ba386 MD |
4370 | kmem_cache_destroy(event_recorder_private_cache); |
4371 | error_kmem_event_recorder_private: | |
4372 | kmem_cache_destroy(event_recorder_cache); | |
4373 | error_kmem_event_recorder: | |
20591cf7 | 4374 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4375 | error_tp: |
4376 | lttng_context_exit(); | |
101215b7 | 4377 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4378 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4379 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4380 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4381 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4382 | LTTNG_VERSION_NAME, |
4383 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4384 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4385 | #else | |
4386 | "", | |
4387 | #endif | |
4388 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4389 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4390 | #else | |
4391 | ""); | |
4392 | #endif | |
1c25284c | 4393 | return ret; |
4e3c1b9b MD |
4394 | } |
4395 | ||
a90917c3 | 4396 | module_init(lttng_events_init); |
11b5a3c2 | 4397 | |
a90917c3 | 4398 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4399 | { |
8cdc1a81 | 4400 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4401 | |
1e367326 | 4402 | lttng_exit_cpu_hotplug(); |
0c956676 | 4403 | lttng_logger_exit(); |
80996790 | 4404 | lttng_abi_exit(); |
8cdc1a81 MD |
4405 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4406 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4407 | kmem_cache_destroy(event_recorder_cache); |
4408 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4409 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4410 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4411 | lttng_tracepoint_exit(); |
07dfc1d0 | 4412 | lttng_context_exit(); |
101215b7 | 4413 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4414 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4415 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4416 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4417 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4418 | LTTNG_VERSION_NAME, |
4419 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4420 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4421 | #else | |
4422 | "", | |
4423 | #endif | |
4424 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4425 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4426 | #else | |
4427 | ""); | |
4428 | #endif | |
4e3c1b9b | 4429 | } |
92e94819 | 4430 | |
a90917c3 | 4431 | module_exit(lttng_events_exit); |
11b5a3c2 | 4432 | |
7ca11e77 | 4433 | #include <generated/patches.h> |
101215b7 MJ |
4434 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4435 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4436 | #endif | |
4437 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4438 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4439 | #endif | |
92e94819 MD |
4440 | MODULE_LICENSE("GPL and additional rights"); |
4441 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4442 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4443 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4444 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4445 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4446 | LTTNG_MODULES_EXTRAVERSION); |