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 | */ |
83006ee0 | 875 | static |
1ae083ba | 876 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler, |
def1e304 | 877 | const struct lttng_kernel_event_desc *event_desc) |
4e3c1b9b | 878 | { |
0def9170 | 879 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent); |
def1e304 | 880 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
5b9817ae | 881 | struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param; |
def1e304 | 882 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; |
a67ba386 MD |
883 | struct lttng_kernel_event_recorder *event_recorder; |
884 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
19bef247 | 885 | struct lttng_kernel_event_common_private *event_priv; |
3c997079 MD |
886 | const char *event_name; |
887 | struct hlist_head *head; | |
3d084699 | 888 | int ret; |
4e3c1b9b | 889 | |
f7d06400 | 890 | if (chan->priv->free_event_id == -1U) { |
4cf0bf51 | 891 | ret = -EMFILE; |
e5382b6d | 892 | goto full; |
abc0446a | 893 | } |
3c997079 MD |
894 | |
895 | switch (itype) { | |
606828e4 | 896 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 897 | event_name = event_desc->event_name; |
3c997079 | 898 | break; |
b4a75708 | 899 | |
c190d76e MJ |
900 | case LTTNG_KERNEL_ABI_KPROBE: |
901 | lttng_fallthrough; | |
902 | case LTTNG_KERNEL_ABI_UPROBE: | |
903 | lttng_fallthrough; | |
904 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
905 | lttng_fallthrough; | |
606828e4 | 906 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
907 | event_name = event_param->name; |
908 | break; | |
b4a75708 | 909 | |
c190d76e MJ |
910 | case LTTNG_KERNEL_ABI_FUNCTION: |
911 | lttng_fallthrough; | |
912 | case LTTNG_KERNEL_ABI_NOOP: | |
913 | lttng_fallthrough; | |
3c997079 MD |
914 | default: |
915 | WARN_ON_ONCE(1); | |
916 | ret = -EINVAL; | |
917 | goto type_error; | |
918 | } | |
4a11ef1c | 919 | |
0def9170 | 920 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 MD |
921 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
922 | event_recorder_priv = container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
923 | ||
924 | WARN_ON_ONCE(!event_priv->desc); | |
925 | if (!strncmp(event_priv->desc->event_name, event_name, | |
606828e4 | 926 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 927 | && chan == event_recorder_priv->pub->chan) { |
3c997079 MD |
928 | ret = -EEXIST; |
929 | goto exist; | |
abc0446a MD |
930 | } |
931 | } | |
3c997079 | 932 | |
a67ba386 MD |
933 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); |
934 | if (!event_recorder) { | |
4cf0bf51 | 935 | ret = -ENOMEM; |
4e3c1b9b | 936 | goto cache_error; |
abc0446a | 937 | } |
a67ba386 MD |
938 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); |
939 | if (!event_recorder_priv) { | |
940 | ret = -ENOMEM; | |
941 | goto cache_private_error; | |
942 | } | |
943 | event_recorder_priv->pub = event_recorder; | |
944 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
945 | event_recorder->priv = event_recorder_priv; | |
946 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
947 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
948 | ||
8a445457 | 949 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 950 | event_recorder->chan = chan; |
f7d06400 | 951 | event_recorder->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
952 | event_recorder->priv->parent.instrumentation = itype; |
953 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
954 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
3c997079 MD |
955 | |
956 | switch (itype) { | |
606828e4 | 957 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 958 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
959 | event_recorder->parent.enabled = 0; |
960 | event_recorder->priv->parent.registered = 0; | |
961 | event_recorder->priv->parent.desc = lttng_event_desc_get(event_name); | |
962 | if (!event_recorder->priv->parent.desc) { | |
4cf0bf51 | 963 | ret = -ENOENT; |
d3dbe23c | 964 | goto register_error; |
abc0446a | 965 | } |
3c997079 MD |
966 | /* Populate lttng_event structure before event registration. */ |
967 | smp_wmb(); | |
baf20995 | 968 | break; |
b4a75708 | 969 | |
606828e4 | 970 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
971 | /* |
972 | * Needs to be explicitly enabled after creation, since | |
973 | * we may want to apply filters. | |
974 | */ | |
a67ba386 MD |
975 | event_recorder->parent.enabled = 0; |
976 | event_recorder->priv->parent.registered = 1; | |
3c997079 MD |
977 | /* |
978 | * Populate lttng_event structure before event | |
979 | * registration. | |
980 | */ | |
981 | smp_wmb(); | |
8bf17deb | 982 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
983 | event_param->u.kprobe.symbol_name, |
984 | event_param->u.kprobe.offset, | |
985 | event_param->u.kprobe.addr, | |
6a35e5bd | 986 | &event_recorder->parent); |
abc0446a | 987 | if (ret) { |
4cf0bf51 | 988 | ret = -EINVAL; |
d6d808f3 | 989 | goto register_error; |
abc0446a | 990 | } |
a67ba386 | 991 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
edeb3137 | 992 | WARN_ON_ONCE(!ret); |
d6d808f3 | 993 | break; |
b4a75708 | 994 | |
606828e4 | 995 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 996 | { |
a67ba386 MD |
997 | struct lttng_kernel_event_recorder *event_recorder_return; |
998 | struct lttng_kernel_event_recorder_private *event_recorder_return_priv; | |
7371f44c MD |
999 | |
1000 | /* kretprobe defines 2 events */ | |
a0493bef MD |
1001 | /* |
1002 | * Needs to be explicitly enabled after creation, since | |
1003 | * we may want to apply filters. | |
1004 | */ | |
a67ba386 MD |
1005 | event_recorder->parent.enabled = 0; |
1006 | event_recorder->priv->parent.registered = 1; | |
1007 | ||
1008 | event_recorder_return = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
1009 | if (!event_recorder_return) { | |
1010 | ret = -ENOMEM; | |
1011 | goto register_error; | |
1012 | } | |
1013 | event_recorder_return_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
1014 | if (!event_recorder_return_priv) { | |
1015 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1016 | ret = -ENOMEM; |
7371f44c | 1017 | goto register_error; |
abc0446a | 1018 | } |
a67ba386 MD |
1019 | event_recorder_return_priv->pub = event_recorder_return; |
1020 | event_recorder_return_priv->parent.pub = &event_recorder_return->parent; | |
1021 | event_recorder_return->priv = event_recorder_return_priv; | |
1022 | event_recorder_return->parent.priv = &event_recorder_return_priv->parent; | |
1023 | event_recorder_return->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
1024 | ||
8a445457 | 1025 | event_recorder_return->parent.run_filter = lttng_kernel_interpret_event_filter; |
a67ba386 | 1026 | event_recorder_return->chan = chan; |
f7d06400 | 1027 | event_recorder_return->priv->id = chan->priv->free_event_id++; |
a67ba386 MD |
1028 | event_recorder_return->priv->parent.instrumentation = itype; |
1029 | event_recorder_return->parent.enabled = 0; | |
1030 | event_recorder_return->priv->parent.registered = 1; | |
1031 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.filter_bytecode_runtime_head); | |
1032 | INIT_LIST_HEAD(&event_recorder_return->priv->parent.enablers_ref_head); | |
7371f44c | 1033 | /* |
a90917c3 | 1034 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1035 | */ |
1036 | smp_wmb(); | |
3c997079 | 1037 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1038 | event_param->u.kretprobe.symbol_name, |
1039 | event_param->u.kretprobe.offset, | |
1040 | event_param->u.kretprobe.addr, | |
eb6b47db | 1041 | &event_recorder->parent, &event_recorder_return->parent); |
7371f44c | 1042 | if (ret) { |
a67ba386 MD |
1043 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1044 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
4cf0bf51 | 1045 | ret = -EINVAL; |
7371f44c MD |
1046 | goto register_error; |
1047 | } | |
1048 | /* Take 2 refs on the module: one per event. */ | |
a67ba386 | 1049 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
7371f44c | 1050 | WARN_ON_ONCE(!ret); |
a67ba386 | 1051 | ret = try_module_get(event_recorder_return->priv->parent.desc->owner); |
7371f44c | 1052 | WARN_ON_ONCE(!ret); |
f7d06400 | 1053 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, |
a67ba386 | 1054 | event_recorder_return); |
abc0446a | 1055 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1056 | if (ret) { |
a67ba386 MD |
1057 | kmem_cache_free(event_recorder_private_cache, event_recorder_return_priv); |
1058 | kmem_cache_free(event_recorder_cache, event_recorder_return); | |
1059 | module_put(event_recorder_return->priv->parent.desc->owner); | |
1060 | module_put(event_recorder->priv->parent.desc->owner); | |
7371f44c MD |
1061 | goto statedump_error; |
1062 | } | |
f7d06400 | 1063 | list_add(&event_recorder_return->priv->node, &chan->parent.session->priv->events); |
7371f44c MD |
1064 | break; |
1065 | } | |
b4a75708 | 1066 | |
606828e4 | 1067 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1068 | /* |
1069 | * Needs to be explicitly enabled after creation, since | |
1070 | * we may want to apply filters. | |
1071 | */ | |
a67ba386 MD |
1072 | event_recorder->parent.enabled = 0; |
1073 | event_recorder->priv->parent.registered = 0; | |
1074 | event_recorder->priv->parent.desc = event_desc; | |
badfe9f5 | 1075 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1076 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1077 | ret = -EINVAL; |
1078 | goto register_error; | |
606828e4 | 1079 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1080 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1081 | break; |
606828e4 | 1082 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1083 | event_recorder->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1084 | break; |
1085 | } | |
1086 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1087 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1088 | ret = -EINVAL; |
1089 | goto register_error; | |
606828e4 | 1090 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1091 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1092 | break; |
606828e4 | 1093 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1094 | event_recorder->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1095 | break; |
1096 | } | |
a67ba386 | 1097 | if (!event_recorder->priv->parent.desc) { |
4cf0bf51 | 1098 | ret = -EINVAL; |
259b6cb3 | 1099 | goto register_error; |
abc0446a | 1100 | } |
1ec65de1 | 1101 | break; |
b4a75708 | 1102 | |
606828e4 | 1103 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1104 | /* |
1105 | * Needs to be explicitly enabled after creation, since | |
1106 | * we may want to apply filters. | |
1107 | */ | |
a67ba386 MD |
1108 | event_recorder->parent.enabled = 0; |
1109 | event_recorder->priv->parent.registered = 1; | |
3aed4dca | 1110 | |
a344f64b FD |
1111 | /* |
1112 | * Populate lttng_event structure before event | |
1113 | * registration. | |
1114 | */ | |
1115 | smp_wmb(); | |
149b9a9d | 1116 | |
83b802dc | 1117 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1118 | event_param->u.uprobe.fd, |
17806c46 | 1119 | &event_recorder->parent); |
149b9a9d YB |
1120 | if (ret) |
1121 | goto register_error; | |
a67ba386 | 1122 | ret = try_module_get(event_recorder->priv->parent.desc->owner); |
149b9a9d YB |
1123 | WARN_ON_ONCE(!ret); |
1124 | break; | |
b4a75708 | 1125 | |
c190d76e MJ |
1126 | case LTTNG_KERNEL_ABI_FUNCTION: |
1127 | lttng_fallthrough; | |
1128 | case LTTNG_KERNEL_ABI_NOOP: | |
1129 | lttng_fallthrough; | |
baf20995 MD |
1130 | default: |
1131 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1132 | ret = -EINVAL; |
df07930b | 1133 | goto register_error; |
baf20995 | 1134 | } |
f7d06400 | 1135 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder); |
abc0446a MD |
1136 | WARN_ON_ONCE(ret > 0); |
1137 | if (ret) { | |
c099397a | 1138 | goto statedump_error; |
abc0446a | 1139 | } |
19bef247 | 1140 | hlist_add_head(&event_recorder->priv->parent.hlist_node, head); |
f7d06400 | 1141 | list_add(&event_recorder->priv->node, &chan->parent.session->priv->events); |
a67ba386 | 1142 | return event_recorder; |
4e3c1b9b | 1143 | |
c099397a | 1144 | statedump_error: |
259b6cb3 | 1145 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1146 | register_error: |
a67ba386 MD |
1147 | kmem_cache_free(event_recorder_private_cache, event_recorder_priv); |
1148 | cache_private_error: | |
1149 | kmem_cache_free(event_recorder_cache, event_recorder); | |
4e3c1b9b MD |
1150 | cache_error: |
1151 | exist: | |
3c997079 | 1152 | type_error: |
e5382b6d | 1153 | full: |
4cf0bf51 | 1154 | return ERR_PTR(ret); |
4e3c1b9b MD |
1155 | } |
1156 | ||
83006ee0 MD |
1157 | static |
1158 | struct lttng_kernel_event_notifier *_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler *event_enabler, | |
1bbb5b2d | 1159 | const struct lttng_kernel_event_desc *event_desc) |
dffef45d | 1160 | { |
0def9170 | 1161 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent); |
1bbb5b2d MD |
1162 | struct lttng_event_notifier_group *event_notifier_group = event_enabler->group; |
1163 | struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param; | |
1164 | uint64_t token = event_enabler->parent.user_token; | |
1165 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
a67ba386 MD |
1166 | struct lttng_kernel_event_notifier *event_notifier; |
1167 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
19bef247 | 1168 | struct lttng_kernel_event_common_private *event_priv; |
ab04d7b1 | 1169 | struct lttng_counter *error_counter; |
dffef45d FD |
1170 | const char *event_name; |
1171 | struct hlist_head *head; | |
1172 | int ret; | |
1173 | ||
1174 | switch (itype) { | |
606828e4 | 1175 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1176 | event_name = event_desc->event_name; |
b01155ba | 1177 | break; |
b4a75708 | 1178 | |
c190d76e MJ |
1179 | case LTTNG_KERNEL_ABI_KPROBE: |
1180 | lttng_fallthrough; | |
1181 | case LTTNG_KERNEL_ABI_UPROBE: | |
1182 | lttng_fallthrough; | |
606828e4 | 1183 | case LTTNG_KERNEL_ABI_SYSCALL: |
1bbb5b2d | 1184 | event_name = event_param->name; |
2b16f0c9 | 1185 | break; |
b4a75708 | 1186 | |
c190d76e MJ |
1187 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1188 | lttng_fallthrough; | |
1189 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1190 | lttng_fallthrough; | |
1191 | case LTTNG_KERNEL_ABI_NOOP: | |
1192 | lttng_fallthrough; | |
dffef45d FD |
1193 | default: |
1194 | WARN_ON_ONCE(1); | |
1195 | ret = -EINVAL; | |
1196 | goto type_error; | |
1197 | } | |
1198 | ||
0def9170 | 1199 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 MD |
1200 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
1201 | event_notifier_priv = container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
1202 | ||
1203 | WARN_ON_ONCE(!event_priv->desc); | |
1204 | if (!strncmp(event_priv->desc->event_name, event_name, | |
606828e4 | 1205 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) |
a67ba386 | 1206 | && event_notifier_group == event_notifier_priv->group |
19bef247 | 1207 | && token == event_priv->user_token) { |
dffef45d FD |
1208 | ret = -EEXIST; |
1209 | goto exist; | |
1210 | } | |
1211 | } | |
1212 | ||
1213 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1214 | if (!event_notifier) { | |
1215 | ret = -ENOMEM; | |
1216 | goto cache_error; | |
1217 | } | |
a67ba386 MD |
1218 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); |
1219 | if (!event_notifier_priv) { | |
1220 | ret = -ENOMEM; | |
1221 | goto cache_private_error; | |
1222 | } | |
1223 | event_notifier_priv->pub = event_notifier; | |
1224 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
1225 | event_notifier->priv = event_notifier_priv; | |
1226 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
1227 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
1228 | ||
1229 | event_notifier->priv->group = event_notifier_group; | |
1bbb5b2d MD |
1230 | event_notifier->priv->parent.user_token = event_enabler->parent.user_token; |
1231 | event_notifier->priv->error_counter_index = event_enabler->error_counter_index; | |
a67ba386 MD |
1232 | event_notifier->priv->num_captures = 0; |
1233 | event_notifier->priv->parent.instrumentation = itype; | |
1234 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
1235 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
1236 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
1237 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
8a445457 | 1238 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; |
dffef45d FD |
1239 | |
1240 | switch (itype) { | |
606828e4 | 1241 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1242 | /* Event will be enabled by enabler sync. */ |
a67ba386 MD |
1243 | event_notifier->parent.enabled = 0; |
1244 | event_notifier->priv->parent.registered = 0; | |
1245 | event_notifier->priv->parent.desc = lttng_event_desc_get(event_name); | |
1246 | if (!event_notifier->priv->parent.desc) { | |
dffef45d FD |
1247 | ret = -ENOENT; |
1248 | goto register_error; | |
1249 | } | |
1250 | /* Populate lttng_event_notifier structure before event registration. */ | |
1251 | smp_wmb(); | |
1252 | break; | |
b4a75708 | 1253 | |
606828e4 | 1254 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1255 | /* |
1256 | * Needs to be explicitly enabled after creation, since | |
1257 | * we may want to apply filters. | |
1258 | */ | |
a67ba386 MD |
1259 | event_notifier->parent.enabled = 0; |
1260 | event_notifier->priv->parent.registered = 1; | |
2b16f0c9 FD |
1261 | /* |
1262 | * Populate lttng_event_notifier structure before event | |
1263 | * registration. | |
1264 | */ | |
1265 | smp_wmb(); | |
1bbb5b2d MD |
1266 | ret = lttng_kprobes_register_event(event_param->u.kprobe.symbol_name, |
1267 | event_param->u.kprobe.symbol_name, | |
1268 | event_param->u.kprobe.offset, | |
1269 | event_param->u.kprobe.addr, | |
6a35e5bd | 1270 | &event_notifier->parent); |
2b16f0c9 FD |
1271 | if (ret) { |
1272 | ret = -EINVAL; | |
1273 | goto register_error; | |
1274 | } | |
a67ba386 | 1275 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
2b16f0c9 FD |
1276 | WARN_ON_ONCE(!ret); |
1277 | break; | |
b4a75708 | 1278 | |
606828e4 | 1279 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1280 | /* |
1281 | * Needs to be explicitly enabled after creation, since | |
1282 | * we may want to apply filters. | |
1283 | */ | |
a67ba386 MD |
1284 | event_notifier->parent.enabled = 0; |
1285 | event_notifier->priv->parent.registered = 0; | |
1286 | event_notifier->priv->parent.desc = event_desc; | |
1bbb5b2d | 1287 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1288 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1289 | ret = -EINVAL; |
1290 | goto register_error; | |
606828e4 | 1291 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
a67ba386 | 1292 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1293 | break; |
606828e4 | 1294 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
a67ba386 | 1295 | event_notifier->priv->parent.u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1296 | break; |
1297 | } | |
1bbb5b2d | 1298 | switch (event_param->u.syscall.abi) { |
606828e4 | 1299 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1300 | ret = -EINVAL; |
1301 | goto register_error; | |
606828e4 | 1302 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
a67ba386 | 1303 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1304 | break; |
606828e4 | 1305 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
a67ba386 | 1306 | event_notifier->priv->parent.u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1307 | break; |
1308 | } | |
1309 | ||
a67ba386 | 1310 | if (!event_notifier->priv->parent.desc) { |
8a8ac9a8 FD |
1311 | ret = -EINVAL; |
1312 | goto register_error; | |
1313 | } | |
1314 | break; | |
b4a75708 | 1315 | |
606828e4 | 1316 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1317 | /* |
1318 | * Needs to be explicitly enabled after creation, since | |
1319 | * we may want to apply filters. | |
1320 | */ | |
a67ba386 MD |
1321 | event_notifier->parent.enabled = 0; |
1322 | event_notifier->priv->parent.registered = 1; | |
9de67196 FD |
1323 | |
1324 | /* | |
1325 | * Populate lttng_event_notifier structure before | |
1326 | * event_notifier registration. | |
1327 | */ | |
1328 | smp_wmb(); | |
1329 | ||
1bbb5b2d MD |
1330 | ret = lttng_uprobes_register_event(event_param->name, |
1331 | event_param->u.uprobe.fd, | |
17806c46 | 1332 | &event_notifier->parent); |
9de67196 FD |
1333 | if (ret) |
1334 | goto register_error; | |
a67ba386 | 1335 | ret = try_module_get(event_notifier->priv->parent.desc->owner); |
9de67196 FD |
1336 | WARN_ON_ONCE(!ret); |
1337 | break; | |
b4a75708 | 1338 | |
c190d76e MJ |
1339 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1340 | lttng_fallthrough; | |
1341 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1342 | lttng_fallthrough; | |
1343 | case LTTNG_KERNEL_ABI_NOOP: | |
1344 | lttng_fallthrough; | |
dffef45d FD |
1345 | default: |
1346 | WARN_ON_ONCE(1); | |
1347 | ret = -EINVAL; | |
1348 | goto register_error; | |
1349 | } | |
1350 | ||
a67ba386 | 1351 | list_add(&event_notifier->priv->node, &event_notifier_group->event_notifiers_head); |
19bef247 | 1352 | hlist_add_head(&event_notifier->priv->parent.hlist_node, head); |
99f52fcc FD |
1353 | |
1354 | /* | |
1355 | * Clear the error counter bucket. The sessiond keeps track of which | |
ab04d7b1 MD |
1356 | * bucket is currently in use. We trust it. The session lock |
1357 | * synchronizes against concurrent creation of the error | |
1358 | * counter. | |
99f52fcc | 1359 | */ |
ab04d7b1 MD |
1360 | error_counter = event_notifier_group->error_counter; |
1361 | if (error_counter) { | |
99f52fcc FD |
1362 | size_t dimension_index[1]; |
1363 | ||
1364 | /* | |
1365 | * Check that the index is within the boundary of the counter. | |
1366 | */ | |
a67ba386 | 1367 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { |
99f52fcc | 1368 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", |
a67ba386 | 1369 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); |
99f52fcc FD |
1370 | ret = -EINVAL; |
1371 | goto register_error; | |
1372 | } | |
1373 | ||
a67ba386 | 1374 | dimension_index[0] = event_notifier->priv->error_counter_index; |
ab04d7b1 | 1375 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); |
99f52fcc FD |
1376 | if (ret) { |
1377 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
a67ba386 | 1378 | event_notifier->priv->error_counter_index); |
99f52fcc FD |
1379 | goto register_error; |
1380 | } | |
1381 | } | |
1382 | ||
dffef45d FD |
1383 | return event_notifier; |
1384 | ||
1385 | register_error: | |
a67ba386 MD |
1386 | kmem_cache_free(event_notifier_private_cache, event_notifier_priv); |
1387 | cache_private_error: | |
dffef45d FD |
1388 | kmem_cache_free(event_notifier_cache, event_notifier); |
1389 | cache_error: | |
1390 | exist: | |
1391 | type_error: | |
1392 | return ERR_PTR(ret); | |
1393 | } | |
1394 | ||
83006ee0 MD |
1395 | struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
1396 | const struct lttng_kernel_event_desc *event_desc) | |
1397 | { | |
1398 | switch (event_enabler->enabler_type) { | |
1399 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1400 | { | |
1401 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1402 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1403 | struct lttng_kernel_event_recorder *event_recorder; | |
1404 | ||
1405 | event_recorder = _lttng_kernel_event_recorder_create(event_recorder_enabler, event_desc); | |
1406 | if (!event_recorder) | |
1407 | return NULL; | |
1408 | return &event_recorder->parent; | |
1409 | } | |
1410 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1411 | { | |
1412 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1413 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1414 | struct lttng_kernel_event_notifier *event_notifier; | |
1415 | ||
1416 | event_notifier = _lttng_kernel_event_notifier_create(event_notifier_enabler, event_desc); | |
1417 | if (!event_notifier) | |
1418 | return NULL; | |
1419 | return &event_notifier->parent; | |
1420 | } | |
1421 | default: | |
1422 | return NULL; | |
1423 | } | |
1424 | } | |
1425 | ||
1426 | struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, | |
1427 | const struct lttng_kernel_event_desc *event_desc) | |
1428 | { | |
1429 | struct lttng_kernel_event_common *event; | |
1430 | ||
1431 | mutex_lock(&sessions_mutex); | |
1432 | event = _lttng_kernel_event_create(event_enabler, event_desc); | |
1433 | mutex_unlock(&sessions_mutex); | |
1434 | return event; | |
1435 | } | |
1436 | ||
1437 | ||
1438 | ||
99f52fcc FD |
1439 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1440 | const size_t *dim_indexes, int32_t cpu, | |
1441 | int64_t *val, bool *overflow, bool *underflow) | |
1442 | { | |
1443 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1444 | cpu, val, overflow, underflow); | |
1445 | } | |
1446 | ||
1447 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1448 | const size_t *dim_indexes, int64_t *val, | |
1449 | bool *overflow, bool *underflow) | |
1450 | { | |
1451 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1452 | val, overflow, underflow); | |
1453 | } | |
1454 | ||
1455 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1456 | const size_t *dim_indexes) | |
1457 | { | |
1458 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1459 | } | |
1460 | ||
3c997079 MD |
1461 | /* Only used for tracepoints for now. */ |
1462 | static | |
0c851fa0 | 1463 | void register_event(struct lttng_kernel_event_common *event) |
3c997079 | 1464 | { |
437d5aa5 | 1465 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1466 | int ret = -EINVAL; |
3c997079 | 1467 | |
0c851fa0 | 1468 | if (event->priv->registered) |
3c997079 | 1469 | return; |
4ecb5ad5 | 1470 | |
0c851fa0 MD |
1471 | desc = event->priv->desc; |
1472 | switch (event->priv->instrumentation) { | |
606828e4 | 1473 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1474 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1475 | desc->tp_class->probe_callback, |
0c851fa0 | 1476 | event); |
4ecb5ad5 | 1477 | break; |
b4a75708 | 1478 | |
606828e4 | 1479 | case LTTNG_KERNEL_ABI_SYSCALL: |
0c851fa0 | 1480 | ret = lttng_syscall_filter_enable_event(event); |
4ecb5ad5 | 1481 | break; |
b4a75708 | 1482 | |
c190d76e MJ |
1483 | case LTTNG_KERNEL_ABI_KPROBE: |
1484 | lttng_fallthrough; | |
1485 | case LTTNG_KERNEL_ABI_UPROBE: | |
4ecb5ad5 | 1486 | ret = 0; |
f0bcc14c | 1487 | break; |
0c851fa0 MD |
1488 | |
1489 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1490 | switch (event->type) { | |
1491 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1492 | ret = 0; | |
1493 | break; | |
1494 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1495 | WARN_ON_ONCE(1); | |
1496 | break; | |
1497 | } | |
4ecb5ad5 | 1498 | break; |
b4a75708 | 1499 | |
c190d76e MJ |
1500 | case LTTNG_KERNEL_ABI_FUNCTION: |
1501 | lttng_fallthrough; | |
1502 | case LTTNG_KERNEL_ABI_NOOP: | |
1503 | lttng_fallthrough; | |
4ecb5ad5 MD |
1504 | default: |
1505 | WARN_ON_ONCE(1); | |
1506 | } | |
3c997079 | 1507 | if (!ret) |
0c851fa0 | 1508 | event->priv->registered = 1; |
3c997079 MD |
1509 | } |
1510 | ||
f0bcc14c | 1511 | int _lttng_event_unregister(struct lttng_kernel_event_common *event) |
4e3c1b9b | 1512 | { |
f0bcc14c | 1513 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
437d5aa5 | 1514 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1515 | int ret = -EINVAL; |
1516 | ||
a67ba386 | 1517 | if (!event_priv->registered) |
3c997079 MD |
1518 | return 0; |
1519 | ||
a67ba386 MD |
1520 | desc = event_priv->desc; |
1521 | switch (event_priv->instrumentation) { | |
606828e4 | 1522 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1523 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1524 | event_priv->desc->tp_class->probe_callback, |
f0bcc14c | 1525 | event); |
baf20995 | 1526 | break; |
b4a75708 | 1527 | |
606828e4 | 1528 | case LTTNG_KERNEL_ABI_KPROBE: |
f0bcc14c | 1529 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1530 | ret = 0; |
1531 | break; | |
b4a75708 | 1532 | |
606828e4 | 1533 | case LTTNG_KERNEL_ABI_KRETPROBE: |
f0bcc14c MD |
1534 | switch (event->type) { |
1535 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1536 | lttng_kretprobes_unregister(event); | |
1537 | ret = 0; | |
1538 | break; | |
1539 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1540 | WARN_ON_ONCE(1); | |
1541 | break; | |
1542 | } | |
7371f44c | 1543 | break; |
b4a75708 | 1544 | |
606828e4 | 1545 | case LTTNG_KERNEL_ABI_SYSCALL: |
f0bcc14c | 1546 | ret = lttng_syscall_filter_disable_event(event); |
4ecb5ad5 | 1547 | break; |
b4a75708 | 1548 | |
606828e4 | 1549 | case LTTNG_KERNEL_ABI_NOOP: |
f0bcc14c MD |
1550 | switch (event->type) { |
1551 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1552 | ret = 0; | |
1553 | break; | |
1554 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1555 | WARN_ON_ONCE(1); | |
1556 | break; | |
1557 | } | |
259b6cb3 | 1558 | break; |
b4a75708 | 1559 | |
606828e4 | 1560 | case LTTNG_KERNEL_ABI_UPROBE: |
f0bcc14c | 1561 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1562 | ret = 0; |
1563 | break; | |
b4a75708 | 1564 | |
c190d76e MJ |
1565 | case LTTNG_KERNEL_ABI_FUNCTION: |
1566 | lttng_fallthrough; | |
baf20995 MD |
1567 | default: |
1568 | WARN_ON_ONCE(1); | |
1569 | } | |
3c997079 | 1570 | if (!ret) |
a67ba386 | 1571 | event_priv->registered = 0; |
dda6a249 MD |
1572 | return ret; |
1573 | } | |
1574 | ||
1575 | /* | |
1576 | * Only used internally at session destruction. | |
1577 | */ | |
be066e6c | 1578 | static |
0648898e | 1579 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1580 | { |
0648898e | 1581 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1582 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1583 | ||
0648898e MD |
1584 | lttng_free_event_filter_runtime(event); |
1585 | /* Free event enabler refs */ | |
1586 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1587 | &event_priv->enablers_ref_head, node) | |
1588 | kfree(enabler_ref); | |
b4a75708 | 1589 | |
0648898e MD |
1590 | switch (event->type) { |
1591 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1592 | { | |
1593 | struct lttng_kernel_event_recorder *event_recorder = | |
1594 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1595 | |
0648898e MD |
1596 | switch (event_priv->instrumentation) { |
1597 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1598 | lttng_event_desc_put(event_priv->desc); | |
1599 | break; | |
b4a75708 | 1600 | |
0648898e MD |
1601 | case LTTNG_KERNEL_ABI_KPROBE: |
1602 | module_put(event_priv->desc->owner); | |
6a35e5bd | 1603 | lttng_kprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1604 | break; |
b4a75708 | 1605 | |
0648898e MD |
1606 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1607 | module_put(event_priv->desc->owner); | |
eb6b47db | 1608 | lttng_kretprobes_destroy_private(&event_recorder->parent); |
0648898e | 1609 | break; |
b4a75708 | 1610 | |
0648898e MD |
1611 | case LTTNG_KERNEL_ABI_SYSCALL: |
1612 | break; | |
4e3c1b9b | 1613 | |
0648898e MD |
1614 | case LTTNG_KERNEL_ABI_UPROBE: |
1615 | module_put(event_priv->desc->owner); | |
17806c46 | 1616 | lttng_uprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1617 | break; |
3ef5cc03 | 1618 | |
c190d76e MJ |
1619 | case LTTNG_KERNEL_ABI_FUNCTION: |
1620 | lttng_fallthrough; | |
1621 | case LTTNG_KERNEL_ABI_NOOP: | |
1622 | lttng_fallthrough; | |
0648898e MD |
1623 | default: |
1624 | WARN_ON_ONCE(1); | |
1625 | } | |
1626 | list_del(&event_recorder->priv->node); | |
1627 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
1628 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1629 | break; |
0648898e MD |
1630 | } |
1631 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1632 | { | |
1633 | struct lttng_kernel_event_notifier *event_notifier = | |
1634 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1635 | |
0648898e MD |
1636 | switch (event_notifier->priv->parent.instrumentation) { |
1637 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1638 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1639 | break; | |
b4a75708 | 1640 | |
0648898e MD |
1641 | case LTTNG_KERNEL_ABI_KPROBE: |
1642 | module_put(event_notifier->priv->parent.desc->owner); | |
6a35e5bd | 1643 | lttng_kprobes_destroy_event_private(&event_notifier->parent); |
0648898e | 1644 | break; |
b4a75708 | 1645 | |
0648898e MD |
1646 | case LTTNG_KERNEL_ABI_SYSCALL: |
1647 | break; | |
b4a75708 | 1648 | |
0648898e MD |
1649 | case LTTNG_KERNEL_ABI_UPROBE: |
1650 | module_put(event_notifier->priv->parent.desc->owner); | |
17806c46 | 1651 | lttng_uprobes_destroy_event_private(&event_notifier->parent); |
0648898e MD |
1652 | break; |
1653 | ||
c190d76e MJ |
1654 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1655 | lttng_fallthrough; | |
1656 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1657 | lttng_fallthrough; | |
1658 | case LTTNG_KERNEL_ABI_NOOP: | |
1659 | lttng_fallthrough; | |
0648898e MD |
1660 | default: |
1661 | WARN_ON_ONCE(1); | |
1662 | } | |
1663 | list_del(&event_notifier->priv->node); | |
1664 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
1665 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1666 | break; | |
1667 | } | |
dffef45d FD |
1668 | default: |
1669 | WARN_ON_ONCE(1); | |
1670 | } | |
dffef45d FD |
1671 | } |
1672 | ||
8c0393c3 | 1673 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1674 | enum tracker_type tracker_type) |
e0130fab | 1675 | { |
d1f652f8 MD |
1676 | switch (tracker_type) { |
1677 | case TRACKER_PID: | |
1678 | return &session->pid_tracker; | |
1679 | case TRACKER_VPID: | |
1680 | return &session->vpid_tracker; | |
1681 | case TRACKER_UID: | |
1682 | return &session->uid_tracker; | |
1683 | case TRACKER_VUID: | |
1684 | return &session->vuid_tracker; | |
1685 | case TRACKER_GID: | |
1686 | return &session->gid_tracker; | |
1687 | case TRACKER_VGID: | |
1688 | return &session->vgid_tracker; | |
1689 | default: | |
1690 | WARN_ON_ONCE(1); | |
1691 | return NULL; | |
1692 | } | |
1693 | } | |
1694 | ||
8cdc1a81 | 1695 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1696 | enum tracker_type tracker_type, int id) |
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 | /* track all ids: destroy tracker. */ | |
1709 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1710 | ret = 0; |
1711 | } else { | |
d1f652f8 | 1712 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1713 | } |
e0130fab MD |
1714 | mutex_unlock(&sessions_mutex); |
1715 | return ret; | |
1716 | } | |
1717 | ||
8cdc1a81 | 1718 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1719 | enum tracker_type tracker_type, int id) |
e0130fab | 1720 | { |
8c0393c3 | 1721 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1722 | int ret; |
1723 | ||
d1f652f8 MD |
1724 | tracker = get_tracker(session, tracker_type); |
1725 | if (!tracker) | |
1726 | return -EINVAL; | |
1727 | if (id < -1) | |
e0130fab MD |
1728 | return -EINVAL; |
1729 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1730 | if (id == -1) { |
1731 | /* untrack all ids: replace by empty tracker. */ | |
1732 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1733 | } else { |
d1f652f8 | 1734 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1735 | } |
e0130fab MD |
1736 | mutex_unlock(&sessions_mutex); |
1737 | return ret; | |
1738 | } | |
1739 | ||
7e6f9ef6 | 1740 | static |
d1f652f8 | 1741 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1742 | { |
8c0393c3 MD |
1743 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1744 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1745 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1746 | int iter = 0, i; |
1747 | ||
1748 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1749 | if (id_tracker_p) { |
1750 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1751 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1752 | |
f934e302 | 1753 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1754 | if (iter++ >= *pos) |
1755 | return e; | |
1756 | } | |
1757 | } | |
1758 | } else { | |
d1f652f8 | 1759 | /* ID tracker disabled. */ |
7e6f9ef6 | 1760 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1761 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1762 | } |
1763 | iter++; | |
1764 | } | |
1765 | /* End of list */ | |
1766 | return NULL; | |
1767 | } | |
1768 | ||
1769 | /* Called with sessions_mutex held. */ | |
1770 | static | |
d1f652f8 | 1771 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1772 | { |
8c0393c3 MD |
1773 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1774 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1775 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1776 | int iter = 0, i; |
1777 | ||
1778 | (*ppos)++; | |
d1f652f8 MD |
1779 | if (id_tracker_p) { |
1780 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1781 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1782 | |
f934e302 | 1783 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1784 | if (iter++ >= *ppos) |
1785 | return e; | |
1786 | } | |
1787 | } | |
1788 | } else { | |
d1f652f8 | 1789 | /* ID tracker disabled. */ |
7e6f9ef6 | 1790 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1791 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1792 | iter++; |
1793 | } | |
1794 | ||
1795 | /* End of list */ | |
1796 | return NULL; | |
1797 | } | |
1798 | ||
1799 | static | |
d1f652f8 | 1800 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1801 | { |
1802 | mutex_unlock(&sessions_mutex); | |
1803 | } | |
1804 | ||
1805 | static | |
d1f652f8 | 1806 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1807 | { |
8c0393c3 MD |
1808 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1809 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1810 | int id; |
7e6f9ef6 | 1811 | |
d1f652f8 | 1812 | if (p == id_tracker_p) { |
7e6f9ef6 | 1813 | /* Tracker disabled. */ |
d1f652f8 | 1814 | id = -1; |
7e6f9ef6 | 1815 | } else { |
d1f652f8 | 1816 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1817 | |
d1f652f8 MD |
1818 | id = lttng_id_tracker_get_node_id(e); |
1819 | } | |
8c0393c3 | 1820 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1821 | case TRACKER_PID: |
1822 | seq_printf(m, "process { pid = %d; };\n", id); | |
1823 | break; | |
1824 | case TRACKER_VPID: | |
1825 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1826 | break; | |
1827 | case TRACKER_UID: | |
1828 | seq_printf(m, "user { uid = %d; };\n", id); | |
1829 | break; | |
1830 | case TRACKER_VUID: | |
1831 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1832 | break; | |
1833 | case TRACKER_GID: | |
1834 | seq_printf(m, "group { gid = %d; };\n", id); | |
1835 | break; | |
1836 | case TRACKER_VGID: | |
1837 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1838 | break; | |
1839 | default: | |
1840 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1841 | } |
7e6f9ef6 MD |
1842 | return 0; |
1843 | } | |
1844 | ||
1845 | static | |
d1f652f8 MD |
1846 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1847 | .start = id_list_start, | |
1848 | .next = id_list_next, | |
1849 | .stop = id_list_stop, | |
1850 | .show = id_list_show, | |
7e6f9ef6 MD |
1851 | }; |
1852 | ||
1853 | static | |
d1f652f8 | 1854 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1855 | { |
d1f652f8 | 1856 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1857 | } |
1858 | ||
1859 | static | |
d1f652f8 | 1860 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1861 | { |
1862 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1863 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1864 | int ret; |
1865 | ||
d1f652f8 | 1866 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1867 | ret = seq_release(inode, file); |
d1f652f8 | 1868 | if (!ret) |
8c0393c3 | 1869 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1870 | return ret; |
1871 | } | |
1872 | ||
d1f652f8 | 1873 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1874 | .owner = THIS_MODULE, |
d1f652f8 | 1875 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1876 | .read = seq_read, |
1877 | .llseek = seq_lseek, | |
d1f652f8 | 1878 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1879 | }; |
1880 | ||
8cdc1a81 | 1881 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1882 | enum tracker_type tracker_type) |
7e6f9ef6 | 1883 | { |
d1f652f8 | 1884 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1885 | struct seq_file *m; |
1886 | int file_fd, ret; | |
1887 | ||
1888 | file_fd = lttng_get_unused_fd(); | |
1889 | if (file_fd < 0) { | |
1890 | ret = file_fd; | |
1891 | goto fd_error; | |
1892 | } | |
1893 | ||
d1f652f8 MD |
1894 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1895 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1896 | NULL, O_RDWR); |
d1f652f8 MD |
1897 | if (IS_ERR(tracker_ids_list_file)) { |
1898 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1899 | goto file_error; |
1900 | } | |
8cdc1a81 | 1901 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1902 | ret = -EOVERFLOW; |
9c1f4643 MD |
1903 | goto refcount_error; |
1904 | } | |
d1f652f8 | 1905 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1906 | if (ret < 0) |
1907 | goto open_error; | |
d1f652f8 MD |
1908 | m = tracker_ids_list_file->private_data; |
1909 | ||
1910 | m->private = get_tracker(session, tracker_type); | |
1911 | BUG_ON(!m->private); | |
1912 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1913 | |
1914 | return file_fd; | |
1915 | ||
1916 | open_error: | |
8cdc1a81 | 1917 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1918 | refcount_error: |
d1f652f8 | 1919 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1920 | file_error: |
1921 | put_unused_fd(file_fd); | |
1922 | fd_error: | |
1923 | return ret; | |
1924 | } | |
1925 | ||
3c997079 MD |
1926 | /* |
1927 | * Enabler management. | |
1928 | */ | |
1929 | static | |
4993071a PP |
1930 | int lttng_match_enabler_star_glob(const char *desc_name, |
1931 | const char *pattern) | |
3c997079 | 1932 | { |
cbc19040 MD |
1933 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1934 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1935 | return 0; |
1936 | return 1; | |
1937 | } | |
1938 | ||
1939 | static | |
4ecb5ad5 MD |
1940 | int lttng_match_enabler_name(const char *desc_name, |
1941 | const char *name) | |
3c997079 | 1942 | { |
4ecb5ad5 | 1943 | if (strcmp(desc_name, name)) |
3c997079 MD |
1944 | return 0; |
1945 | return 1; | |
1946 | } | |
1947 | ||
8bff0fc3 MD |
1948 | static |
1949 | int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc, | |
8d554755 | 1950 | struct lttng_event_enabler_common *enabler) |
3c997079 | 1951 | { |
4ecb5ad5 | 1952 | const char *desc_name, *enabler_name; |
badfe9f5 | 1953 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1954 | |
1955 | enabler_name = enabler->event_param.name; | |
1956 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1957 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1958 | desc_name = desc->event_name; |
3b861b22 FD |
1959 | switch (enabler->format_type) { |
1960 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1961 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1962 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1963 | return lttng_match_enabler_name(desc_name, enabler_name); |
1964 | default: | |
1965 | return -EINVAL; | |
1966 | } | |
4ecb5ad5 | 1967 | break; |
b4a75708 | 1968 | |
606828e4 | 1969 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1970 | desc_name = desc->event_name; |
badfe9f5 | 1971 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1972 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1973 | compat = true; |
1974 | } | |
4ecb5ad5 MD |
1975 | if (!strncmp(desc_name, "syscall_exit_", |
1976 | strlen("syscall_exit_"))) { | |
1977 | desc_name += strlen("syscall_exit_"); | |
1978 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1979 | strlen("syscall_entry_"))) { | |
1980 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1981 | entry = true; |
4ecb5ad5 MD |
1982 | } else { |
1983 | WARN_ON_ONCE(1); | |
1984 | return -EINVAL; | |
1985 | } | |
badfe9f5 | 1986 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1987 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1988 | break; |
606828e4 | 1989 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1990 | if (!entry) |
1991 | return 0; | |
1992 | break; | |
606828e4 | 1993 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1994 | if (entry) |
1995 | return 0; | |
1996 | break; | |
1997 | default: | |
1998 | return -EINVAL; | |
1999 | } | |
2000 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 2001 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 2002 | break; |
606828e4 | 2003 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
2004 | if (compat) |
2005 | return 0; | |
2006 | break; | |
606828e4 | 2007 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
2008 | if (!compat) |
2009 | return 0; | |
2010 | break; | |
2011 | default: | |
2012 | return -EINVAL; | |
2013 | } | |
2014 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2015 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2016 | switch (enabler->format_type) { |
2017 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2018 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2019 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2020 | return lttng_match_enabler_name(desc_name, enabler_name); |
2021 | default: | |
2022 | return -EINVAL; | |
2023 | } | |
2024 | break; | |
606828e4 | 2025 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2026 | return -EINVAL; /* Not implemented. */ |
2027 | default: | |
2028 | return -EINVAL; | |
2029 | } | |
4ecb5ad5 | 2030 | break; |
b4a75708 | 2031 | |
4ecb5ad5 MD |
2032 | default: |
2033 | WARN_ON_ONCE(1); | |
2034 | return -EINVAL; | |
2035 | } | |
3c997079 MD |
2036 | } |
2037 | ||
8bff0fc3 MD |
2038 | bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
2039 | struct lttng_event_enabler_common *enabler) | |
2040 | { | |
2041 | int ret; | |
2042 | ||
2043 | ret = lttng_desc_match_enabler_check(desc, enabler); | |
2044 | if (ret < 0) { | |
2045 | WARN_ON_ONCE(1); | |
2046 | return false; | |
2047 | } | |
2048 | return ret; | |
2049 | } | |
2050 | ||
5c6ec66a MD |
2051 | bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler, |
2052 | struct lttng_kernel_event_common *event) | |
3c997079 | 2053 | { |
5c6ec66a MD |
2054 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
2055 | return false; | |
b2bc0bc8 | 2056 | |
5c6ec66a MD |
2057 | switch (event_enabler->enabler_type) { |
2058 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2059 | { | |
2060 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2061 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2062 | struct lttng_kernel_event_recorder *event_recorder = | |
2063 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2064 | ||
2065 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
2066 | && event_recorder->chan == event_recorder_enabler->chan) | |
2067 | return true; | |
2068 | else | |
2069 | return false; | |
2070 | } | |
2071 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2072 | { | |
2073 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2074 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2075 | struct lttng_kernel_event_notifier *event_notifier = | |
2076 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2077 | ||
2078 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
2079 | && event_notifier->priv->group == event_notifier_enabler->group | |
2080 | && event->priv->user_token == event_enabler->user_token) | |
2081 | return true; | |
2082 | else | |
2083 | return false; | |
2084 | } | |
2085 | default: | |
2086 | WARN_ON_ONCE(1); | |
2087 | return false; | |
2088 | } | |
3c997079 MD |
2089 | } |
2090 | ||
5c6ec66a MD |
2091 | bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler, |
2092 | const struct lttng_kernel_event_desc *desc, | |
2093 | struct lttng_kernel_event_common *event) | |
b01155ba | 2094 | { |
5c6ec66a MD |
2095 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
2096 | return false; | |
b01155ba | 2097 | |
5c6ec66a MD |
2098 | switch (event_enabler->enabler_type) { |
2099 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2100 | { | |
2101 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2102 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2103 | struct lttng_kernel_event_recorder *event_recorder = | |
2104 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2105 | ||
2106 | if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan) | |
2107 | return true; | |
2108 | else | |
2109 | return false; | |
2110 | } | |
2111 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2112 | { | |
2113 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2114 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2115 | struct lttng_kernel_event_notifier *event_notifier = | |
2116 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2117 | ||
2118 | if (event->priv->desc == desc | |
2119 | && event_notifier->priv->group == event_notifier_enabler->group | |
2120 | && event->priv->user_token == event_enabler->user_token) | |
2121 | return true; | |
2122 | else | |
2123 | return false; | |
2124 | } | |
2125 | default: | |
2126 | WARN_ON_ONCE(1); | |
2127 | return false; | |
2128 | } | |
b01155ba FD |
2129 | } |
2130 | ||
3c997079 | 2131 | static |
b2bc0bc8 FD |
2132 | struct lttng_enabler_ref *lttng_enabler_ref( |
2133 | struct list_head *enablers_ref_list, | |
8d554755 | 2134 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2135 | { |
2136 | struct lttng_enabler_ref *enabler_ref; | |
2137 | ||
b2bc0bc8 | 2138 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2139 | if (enabler_ref->ref == enabler) |
2140 | return enabler_ref; | |
2141 | } | |
2142 | return NULL; | |
2143 | } | |
2144 | ||
3c997079 | 2145 | static |
c8e14380 | 2146 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2147 | { |
c8e14380 | 2148 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
437d5aa5 MD |
2149 | struct lttng_kernel_probe_desc *probe_desc; |
2150 | const struct lttng_kernel_event_desc *desc; | |
3c997079 | 2151 | struct list_head *probe_list; |
c8e14380 | 2152 | int i; |
3c997079 MD |
2153 | |
2154 | probe_list = lttng_get_probe_list_head(); | |
2155 | /* | |
2156 | * For each probe event, if we find that a probe event matches | |
2157 | * our enabler, create an associated lttng_event if not | |
2158 | * already present. | |
2159 | */ | |
2160 | list_for_each_entry(probe_desc, probe_list, head) { | |
2161 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2162 | int found = 0; | |
2163 | struct hlist_head *head; | |
83006ee0 | 2164 | struct lttng_kernel_event_common *event; |
19bef247 | 2165 | struct lttng_kernel_event_common_private *event_priv; |
3c997079 MD |
2166 | |
2167 | desc = probe_desc->event_desc[i]; | |
c8e14380 | 2168 | if (!lttng_desc_match_enabler(desc, event_enabler)) |
3c997079 | 2169 | continue; |
3c997079 MD |
2170 | |
2171 | /* | |
2172 | * Check if already created. | |
2173 | */ | |
0def9170 | 2174 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 2175 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
c8e14380 | 2176 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) |
3c997079 MD |
2177 | found = 1; |
2178 | } | |
2179 | if (found) | |
2180 | continue; | |
2181 | ||
2182 | /* | |
83006ee0 | 2183 | * We need to create an event for this event probe. |
3c997079 | 2184 | */ |
c8e14380 | 2185 | event = _lttng_kernel_event_create(event_enabler, desc); |
83006ee0 | 2186 | if (!event) { |
5a15f70c | 2187 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2188 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2189 | } |
2190 | } | |
2191 | } | |
2192 | } | |
2193 | ||
33a39a3c | 2194 | static |
053554ae | 2195 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c MD |
2196 | { |
2197 | int ret; | |
2198 | ||
053554ae | 2199 | ret = lttng_syscalls_register_event(event_enabler); |
8a8ac9a8 | 2200 | WARN_ON_ONCE(ret); |
8a8ac9a8 FD |
2201 | } |
2202 | ||
33a39a3c | 2203 | /* |
8839618b | 2204 | * Create event if it is missing and present in the list of tracepoint probes. |
33a39a3c MD |
2205 | * Should be called with sessions mutex held. |
2206 | */ | |
2207 | static | |
8839618b | 2208 | void lttng_create_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c | 2209 | { |
8839618b | 2210 | switch (event_enabler->event_param.instrumentation) { |
606828e4 | 2211 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
8839618b | 2212 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2213 | break; |
b4a75708 | 2214 | |
606828e4 | 2215 | case LTTNG_KERNEL_ABI_SYSCALL: |
8839618b | 2216 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2217 | break; |
b4a75708 | 2218 | |
33a39a3c MD |
2219 | default: |
2220 | WARN_ON_ONCE(1); | |
2221 | break; | |
2222 | } | |
2223 | } | |
2224 | ||
3c997079 | 2225 | /* |
b2bc0bc8 | 2226 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2227 | * and add backward reference from the event to the enabler. |
2228 | * Should be called with sessions mutex held. | |
2229 | */ | |
2230 | static | |
1ae083ba | 2231 | int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler *event_enabler) |
3c997079 | 2232 | { |
f7d06400 MD |
2233 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
2234 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; | |
1ae083ba | 2235 | struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(event_enabler); |
a67ba386 | 2236 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2237 | |
606828e4 MD |
2238 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2239 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2240 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2241 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2242 | int enabled = base_enabler->enabled; |
606828e4 | 2243 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2244 | |
606828e4 | 2245 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2246 | WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_entry, enabled); |
3b82c4e1 | 2247 | |
606828e4 | 2248 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2249 | WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_exit, enabled); |
badfe9f5 MD |
2250 | } |
2251 | ||
3c997079 | 2252 | /* First ensure that probe events are created for this enabler. */ |
8839618b | 2253 | lttng_create_event_if_missing(&event_enabler->parent); |
3c997079 | 2254 | |
b2bc0bc8 | 2255 | /* For each event matching event_enabler in session event list. */ |
8cdc1a81 | 2256 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2257 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2258 | struct lttng_enabler_ref *enabler_ref; |
2259 | ||
5c6ec66a | 2260 | if (!lttng_event_enabler_match_event(&event_enabler->parent, &event_recorder->parent)) |
3c997079 | 2261 | continue; |
a67ba386 | 2262 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
1ae083ba | 2263 | lttng_event_recorder_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2264 | if (!enabler_ref) { |
2265 | /* | |
2266 | * If no backward ref, create it. | |
b2bc0bc8 | 2267 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2268 | */ |
2269 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2270 | if (!enabler_ref) | |
2271 | return -ENOMEM; | |
1ae083ba | 2272 | enabler_ref->ref = lttng_event_recorder_enabler_as_enabler(event_enabler); |
3c997079 | 2273 | list_add(&enabler_ref->node, |
a67ba386 | 2274 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2275 | } |
2276 | ||
f127e61e MD |
2277 | /* |
2278 | * Link filter bytecodes if not linked yet. | |
2279 | */ | |
a67ba386 | 2280 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2281 | lttng_static_ctx, |
a67ba386 | 2282 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
1ae083ba | 2283 | <tng_event_recorder_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2284 | } |
2285 | return 0; | |
2286 | } | |
2287 | ||
b01155ba FD |
2288 | /* |
2289 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2290 | */ | |
2291 | static | |
8a8ac9a8 FD |
2292 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2293 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2294 | { |
2295 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8d554755 | 2296 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2297 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2298 | |
606828e4 MD |
2299 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2300 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2301 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2302 | !strcmp(base_enabler->event_param.name, "*")) { |
2303 | ||
2304 | int enabled = base_enabler->enabled; | |
606828e4 | 2305 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2306 | |
606828e4 | 2307 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2308 | WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_entry, enabled); |
8a8ac9a8 | 2309 | |
606828e4 | 2310 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2311 | WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_exit, enabled); |
8a8ac9a8 FD |
2312 | |
2313 | } | |
2314 | ||
b01155ba | 2315 | /* First ensure that probe event_notifiers are created for this enabler. */ |
8839618b | 2316 | lttng_create_event_if_missing(&event_notifier_enabler->parent); |
b01155ba FD |
2317 | |
2318 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2319 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2320 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2321 | struct lttng_enabler_ref *enabler_ref; |
2322 | ||
5c6ec66a | 2323 | if (!lttng_event_enabler_match_event(&event_notifier_enabler->parent, &event_notifier->parent)) |
b01155ba FD |
2324 | continue; |
2325 | ||
a67ba386 | 2326 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2327 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2328 | if (!enabler_ref) { | |
2329 | /* | |
2330 | * If no backward ref, create it. | |
2331 | * Add backward ref from event_notifier to enabler. | |
2332 | */ | |
2333 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2334 | if (!enabler_ref) | |
2335 | return -ENOMEM; | |
2336 | ||
2337 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2338 | event_notifier_enabler); | |
2339 | list_add(&enabler_ref->node, | |
a67ba386 | 2340 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2341 | } |
2342 | ||
2343 | /* | |
2344 | * Link filter bytecodes if not linked yet. | |
2345 | */ | |
a67ba386 MD |
2346 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2347 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2348 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2349 | |
2350 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2351 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2352 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2353 | &event_notifier_enabler->capture_bytecode_head); |
2354 | ||
a67ba386 | 2355 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2356 | } |
2357 | return 0; | |
2358 | } | |
2359 | ||
3c997079 MD |
2360 | /* |
2361 | * Called at module load: connect the probe on all enablers matching | |
2362 | * this event. | |
2363 | * Called with sessions lock held. | |
2364 | */ | |
2365 | int lttng_fix_pending_events(void) | |
2366 | { | |
8cdc1a81 | 2367 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2368 | |
8cdc1a81 MD |
2369 | list_for_each_entry(session_priv, &sessions, list) |
2370 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2371 | return 0; |
2372 | } | |
2373 | ||
b01155ba FD |
2374 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2375 | struct lttng_event_notifier_group *event_notifier_group) | |
2376 | { | |
2377 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2378 | ||
2379 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2380 | node) { | |
5b9817ae | 2381 | if (event_notifier_enabler->parent.enabled) |
b01155ba FD |
2382 | return true; |
2383 | } | |
2384 | return false; | |
2385 | } | |
2386 | ||
2387 | bool lttng_event_notifier_active(void) | |
2388 | { | |
2389 | struct lttng_event_notifier_group *event_notifier_group; | |
2390 | ||
2391 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2392 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2393 | return true; | |
2394 | } | |
2395 | return false; | |
2396 | } | |
2397 | ||
2398 | int lttng_fix_pending_event_notifiers(void) | |
2399 | { | |
2400 | struct lttng_event_notifier_group *event_notifier_group; | |
2401 | ||
2402 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2403 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2404 | return 0; | |
2405 | } | |
2406 | ||
1ae083ba | 2407 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2408 | enum lttng_enabler_format_type format_type, |
606828e4 | 2409 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2410 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2411 | { |
1ae083ba | 2412 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2413 | |
b2bc0bc8 FD |
2414 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2415 | if (!event_enabler) | |
3c997079 | 2416 | return NULL; |
0bb716a8 | 2417 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2418 | event_enabler->parent.format_type = format_type; |
2419 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2420 | memcpy(&event_enabler->parent.event_param, event_param, | |
2421 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2422 | event_enabler->chan = chan; |
3c997079 | 2423 | /* ctx left NULL */ |
5b9817ae | 2424 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2425 | return event_enabler; |
2426 | } | |
2427 | ||
2428 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2429 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2430 | { |
3c997079 | 2431 | mutex_lock(&sessions_mutex); |
def1e304 MD |
2432 | list_add(&event_enabler->node, &session->priv->enablers_head); |
2433 | event_enabler->published = true; | |
2434 | lttng_session_lazy_sync_event_enablers(session); | |
3c997079 | 2435 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2436 | } |
2437 | ||
7b25ab0e | 2438 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2439 | { |
2440 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2441 | event_enabler->enabled = 1; |
2442 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2443 | mutex_unlock(&sessions_mutex); |
2444 | return 0; | |
2445 | } | |
2446 | ||
7b25ab0e | 2447 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2448 | { |
2449 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2450 | event_enabler->enabled = 0; |
2451 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2452 | mutex_unlock(&sessions_mutex); |
2453 | return 0; | |
2454 | } | |
2455 | ||
b2bc0bc8 | 2456 | static |
8d554755 | 2457 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2458 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2459 | { |
d64ca521 | 2460 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2461 | uint32_t bytecode_len; |
2462 | int ret; | |
2463 | ||
2464 | ret = get_user(bytecode_len, &bytecode->len); | |
2465 | if (ret) | |
2466 | return ret; | |
52cfcdf3 | 2467 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2468 | GFP_KERNEL); |
2469 | if (!bytecode_node) | |
2470 | return -ENOMEM; | |
2471 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2472 | sizeof(*bytecode) + bytecode_len); | |
2473 | if (ret) | |
2474 | goto error_free; | |
b2bc0bc8 | 2475 | |
8a445457 | 2476 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2477 | bytecode_node->enabler = enabler; |
2478 | /* Enforce length based on allocated size */ | |
2479 | bytecode_node->bc.len = bytecode_len; | |
2480 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2481 | |
07dfc1d0 MD |
2482 | return 0; |
2483 | ||
2484 | error_free: | |
52cfcdf3 | 2485 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2486 | return ret; |
2487 | } | |
2488 | ||
6048044f | 2489 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2490 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2491 | { |
2492 | int ret; | |
6048044f | 2493 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2494 | if (ret) |
2495 | goto error; | |
7b25ab0e | 2496 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2497 | return 0; |
2498 | ||
2499 | error: | |
2500 | return ret; | |
2501 | } | |
2502 | ||
e2d5dbc7 | 2503 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2504 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2505 | { |
2506 | ||
e2d5dbc7 | 2507 | switch (event->priv->instrumentation) { |
606828e4 | 2508 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2509 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2510 | default: |
2511 | return -EINVAL; | |
2512 | } | |
2513 | } | |
2514 | ||
3c997079 | 2515 | static |
8d554755 | 2516 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2517 | { |
d64ca521 | 2518 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2519 | |
2520 | /* Destroy filter bytecode */ | |
2521 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2522 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2523 | lttng_kvfree(filter_node); |
07dfc1d0 | 2524 | } |
b2bc0bc8 FD |
2525 | } |
2526 | ||
44b1abdc | 2527 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2528 | { |
44b1abdc MD |
2529 | switch (event_enabler->enabler_type) { |
2530 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2531 | { | |
2532 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2533 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2534 | ||
2535 | lttng_enabler_destroy(event_enabler); | |
2536 | if (event_recorder_enabler->published) | |
2537 | list_del(&event_recorder_enabler->node); | |
2538 | kfree(event_recorder_enabler); | |
2539 | break; | |
2540 | } | |
2541 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2542 | { | |
2543 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2544 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2545 | |
44b1abdc | 2546 | lttng_enabler_destroy(event_enabler); |
1bbb5b2d MD |
2547 | if (event_notifier_enabler->published) |
2548 | list_del(&event_notifier_enabler->node); | |
44b1abdc MD |
2549 | kfree(event_notifier_enabler); |
2550 | break; | |
2551 | } | |
2552 | default: | |
2553 | WARN_ON_ONCE(1); | |
2554 | } | |
3c997079 MD |
2555 | } |
2556 | ||
dffef45d | 2557 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
dffef45d | 2558 | enum lttng_enabler_format_type format_type, |
1bbb5b2d MD |
2559 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
2560 | struct lttng_event_notifier_group *event_notifier_group) | |
dffef45d FD |
2561 | { |
2562 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2563 | ||
2564 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2565 | if (!event_notifier_enabler) | |
2566 | return NULL; | |
2567 | ||
0bb716a8 | 2568 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2569 | event_notifier_enabler->parent.format_type = format_type; |
2570 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2571 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2572 | ||
99f52fcc | 2573 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2574 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2575 | |
5b9817ae MD |
2576 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2577 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2578 | |
5b9817ae MD |
2579 | event_notifier_enabler->parent.enabled = 0; |
2580 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d | 2581 | event_notifier_enabler->group = event_notifier_group; |
1bbb5b2d MD |
2582 | return event_notifier_enabler; |
2583 | } | |
dffef45d | 2584 | |
1bbb5b2d MD |
2585 | void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group, |
2586 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2587 | { | |
dffef45d FD |
2588 | mutex_lock(&sessions_mutex); |
2589 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
1bbb5b2d | 2590 | event_notifier_enabler->published = true; |
b01155ba | 2591 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d | 2592 | mutex_unlock(&sessions_mutex); |
dffef45d FD |
2593 | } |
2594 | ||
2595 | int lttng_event_notifier_enabler_enable( | |
2596 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2597 | { | |
2598 | mutex_lock(&sessions_mutex); | |
2599 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2600 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2601 | mutex_unlock(&sessions_mutex); |
2602 | return 0; | |
2603 | } | |
2604 | ||
2605 | int lttng_event_notifier_enabler_disable( | |
2606 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2607 | { | |
2608 | mutex_lock(&sessions_mutex); | |
2609 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2610 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2611 | mutex_unlock(&sessions_mutex); |
2612 | return 0; | |
2613 | } | |
2614 | ||
99d223ad FD |
2615 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2616 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2617 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2618 | { |
d64ca521 | 2619 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2620 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2621 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2622 | uint32_t bytecode_len; | |
2623 | int ret; | |
2624 | ||
2625 | ret = get_user(bytecode_len, &bytecode->len); | |
2626 | if (ret) | |
2627 | return ret; | |
2628 | ||
2629 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2630 | GFP_KERNEL); | |
2631 | if (!bytecode_node) | |
2632 | return -ENOMEM; | |
2633 | ||
2634 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2635 | sizeof(*bytecode) + bytecode_len); | |
2636 | if (ret) | |
2637 | goto error_free; | |
2638 | ||
8a445457 | 2639 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2640 | bytecode_node->enabler = enabler; |
2641 | ||
2642 | /* Enforce length based on allocated size */ | |
2643 | bytecode_node->bc.len = bytecode_len; | |
2644 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2645 | ||
2646 | event_notifier_enabler->num_captures++; | |
2647 | ||
2648 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2649 | goto end; | |
2650 | ||
2651 | error_free: | |
2652 | lttng_kvfree(bytecode_node); | |
2653 | end: | |
2654 | return ret; | |
2655 | } | |
2656 | ||
3c997079 | 2657 | /* |
b2bc0bc8 | 2658 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2659 | * session. |
2660 | * Should be called with sessions mutex held. | |
2661 | */ | |
2662 | static | |
8cdc1a81 | 2663 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2664 | { |
1ae083ba | 2665 | struct lttng_event_recorder_enabler *event_enabler; |
a67ba386 | 2666 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2667 | |
8cdc1a81 | 2668 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2669 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2670 | /* |
2671 | * For each event, if at least one of its enablers is enabled, | |
2672 | * and its channel and session transient states are enabled, we | |
2673 | * enable the event, else we disable it. | |
2674 | */ | |
8cdc1a81 | 2675 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2676 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2677 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2678 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2679 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2680 | int nr_filters = 0; | |
3c997079 | 2681 | |
a67ba386 | 2682 | switch (event_recorder_priv->parent.instrumentation) { |
c190d76e MJ |
2683 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2684 | lttng_fallthrough; | |
606828e4 | 2685 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
2686 | /* Enable events */ |
2687 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2688 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2689 | if (enabler_ref->ref->enabled) { |
2690 | enabled = 1; | |
2691 | break; | |
2692 | } | |
2693 | } | |
4ecb5ad5 | 2694 | break; |
b4a75708 | 2695 | |
4ecb5ad5 | 2696 | default: |
3c997079 MD |
2697 | /* Not handled with lazy sync. */ |
2698 | continue; | |
2699 | } | |
2700 | /* | |
2701 | * Enabled state is based on union of enablers, with | |
2702 | * intesection of session and channel transient enable | |
2703 | * states. | |
2704 | */ | |
f7d06400 | 2705 | enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; |
3c997079 | 2706 | |
a67ba386 | 2707 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2708 | /* |
2709 | * Sync tracepoint registration with event enabled | |
2710 | * state. | |
2711 | */ | |
2712 | if (enabled) { | |
0c851fa0 | 2713 | register_event(&event_recorder->parent); |
3c997079 | 2714 | } else { |
f0bcc14c | 2715 | _lttng_event_unregister(&event_recorder->parent); |
3c997079 | 2716 | } |
07dfc1d0 MD |
2717 | |
2718 | /* Check if has enablers without bytecode enabled */ | |
2719 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2720 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2721 | if (enabler_ref->ref->enabled |
2722 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2723 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2724 | break; |
2725 | } | |
2726 | } | |
a67ba386 | 2727 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2728 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2729 | |
2730 | /* Enable filters */ | |
2731 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2732 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2733 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2734 | nr_filters++; |
2735 | } | |
2736 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2737 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2738 | } |
2739 | } | |
2740 | ||
2741 | /* | |
2742 | * Apply enablers to session events, adding events to session if need | |
2743 | * be. It is required after each modification applied to an active | |
2744 | * session, and right before session "start". | |
2745 | * "lazy" sync means we only sync if required. | |
2746 | * Should be called with sessions mutex held. | |
2747 | */ | |
2748 | static | |
8cdc1a81 | 2749 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2750 | { |
2751 | /* We can skip if session is not active */ | |
2752 | if (!session->active) | |
2753 | return; | |
b2bc0bc8 | 2754 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2755 | } |
2756 | ||
b01155ba FD |
2757 | static |
2758 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2759 | { | |
2760 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2761 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2762 | |
2763 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2764 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2765 | ||
2766 | /* | |
2767 | * For each event_notifier, if at least one of its enablers is enabled, | |
2768 | * we enable the event_notifier, else we disable it. | |
2769 | */ | |
a67ba386 MD |
2770 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2771 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2772 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2773 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2774 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2775 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2776 | |
a67ba386 | 2777 | switch (event_notifier_priv->parent.instrumentation) { |
c190d76e MJ |
2778 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2779 | lttng_fallthrough; | |
606828e4 | 2780 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
2781 | /* Enable event_notifiers */ |
2782 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2783 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2784 | if (enabler_ref->ref->enabled) { |
2785 | enabled = 1; | |
2786 | break; | |
2787 | } | |
2788 | } | |
2789 | break; | |
b4a75708 | 2790 | |
b01155ba FD |
2791 | default: |
2792 | /* Not handled with sync. */ | |
2793 | continue; | |
2794 | } | |
2795 | ||
a67ba386 | 2796 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2797 | /* |
2798 | * Sync tracepoint registration with event_notifier enabled | |
2799 | * state. | |
2800 | */ | |
2801 | if (enabled) { | |
a67ba386 | 2802 | if (!event_notifier_priv->parent.registered) |
0c851fa0 | 2803 | register_event(&event_notifier->parent); |
b01155ba | 2804 | } else { |
a67ba386 | 2805 | if (event_notifier_priv->parent.registered) |
f0bcc14c | 2806 | _lttng_event_unregister(&event_notifier->parent); |
b01155ba FD |
2807 | } |
2808 | ||
2809 | /* Check if has enablers without bytecode enabled */ | |
2810 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2811 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2812 | if (enabler_ref->ref->enabled |
2813 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2814 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2815 | break; |
2816 | } | |
2817 | } | |
a67ba386 | 2818 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2819 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2820 | |
2821 | /* Enable filters */ | |
2822 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2823 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2824 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2825 | nr_filters++; |
2826 | } | |
2827 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2828 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2829 | |
2830 | /* Enable captures */ | |
2831 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2832 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2833 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2834 | nr_captures++; |
2835 | } | |
2836 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2837 | } |
2838 | } | |
2839 | ||
7b25ab0e MD |
2840 | static |
2841 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2842 | { | |
2843 | switch (event_enabler->enabler_type) { | |
2844 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2845 | { | |
2846 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2847 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2848 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2849 | break; | |
2850 | } | |
2851 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2852 | { | |
2853 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2854 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2855 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2856 | break; | |
2857 | } | |
2858 | default: | |
2859 | WARN_ON_ONCE(1); | |
2860 | } | |
2861 | } | |
2862 | ||
1ec3f75a | 2863 | /* |
d83004aa JD |
2864 | * Serialize at most one packet worth of metadata into a metadata |
2865 | * channel. | |
92d9f5e6 MD |
2866 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2867 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2868 | * allows us to do racy operations such as looking for remaining space left in | |
2869 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2870 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2871 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2872 | * Returns the number of bytes written in the channel, 0 if no data |
2873 | * was written and a negative value on error. | |
1ec3f75a | 2874 | */ |
b3b8072b | 2875 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2876 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2877 | { |
8a57ec02 | 2878 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2879 | int ret = 0; |
2880 | size_t len, reserve_len; | |
2881 | ||
f613e3e6 | 2882 | /* |
92d9f5e6 MD |
2883 | * Ensure we support mutiple get_next / put sequences followed by |
2884 | * put_next. The metadata cache lock protects reading the metadata | |
2885 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2886 | * "flush" operations on the buffer invoked by different processes. | |
2887 | * Moreover, since the metadata cache memory can be reallocated, we | |
2888 | * need to have exclusive access against updates even though we only | |
2889 | * read it. | |
f613e3e6 | 2890 | */ |
92d9f5e6 | 2891 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2892 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2893 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2894 | goto end; |
f613e3e6 | 2895 | |
9616f0bf JD |
2896 | /* Metadata regenerated, change the version. */ |
2897 | if (stream->metadata_cache->version != stream->version) | |
2898 | stream->version = stream->metadata_cache->version; | |
2899 | ||
d83004aa | 2900 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2901 | stream->metadata_in; |
9de2c215 | 2902 | if (!len) |
de23d59d | 2903 | goto end; |
d83004aa | 2904 | reserve_len = min_t(size_t, |
4a399b76 | 2905 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2906 | len); |
a775608d | 2907 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2908 | sizeof(char), NULL); |
d83004aa JD |
2909 | /* |
2910 | * If reservation failed, return an error to the caller. | |
2911 | */ | |
c2fb9c1c | 2912 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2913 | if (ret != 0) { |
2914 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2915 | stream->coherent = false; |
d83004aa JD |
2916 | goto end; |
2917 | } | |
b3b8072b | 2918 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2919 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2920 | reserve_len, 1); |
b3b8072b | 2921 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2922 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2923 | if (reserve_len < len) |
8b97fd42 MD |
2924 | stream->coherent = false; |
2925 | else | |
2926 | stream->coherent = true; | |
d83004aa JD |
2927 | ret = reserve_len; |
2928 | ||
2929 | end: | |
8b97fd42 MD |
2930 | if (coherent) |
2931 | *coherent = stream->coherent; | |
92d9f5e6 | 2932 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2933 | return ret; |
2934 | } | |
2935 | ||
8b97fd42 | 2936 | static |
8cdc1a81 | 2937 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2938 | { |
8cdc1a81 MD |
2939 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2940 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2941 | } |
2942 | ||
2943 | static | |
8cdc1a81 | 2944 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2945 | { |
8cdc1a81 MD |
2946 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2947 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2948 | struct lttng_metadata_stream *stream; |
2949 | ||
8cdc1a81 | 2950 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2951 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2952 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2953 | } |
8b97fd42 MD |
2954 | } |
2955 | ||
d83004aa JD |
2956 | /* |
2957 | * Write the metadata to the metadata cache. | |
2958 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2959 | * The metadata cache lock protects us from concurrent read access from |
2960 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2961 | * The content of the printf is printed as a single atomic metadata |
2962 | * transaction. | |
d83004aa | 2963 | */ |
8cdc1a81 | 2964 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
2965 | const char *fmt, ...) |
2966 | { | |
c099397a | 2967 | char *str; |
d83004aa | 2968 | size_t len; |
c099397a MD |
2969 | va_list ap; |
2970 | ||
585e5dcc | 2971 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2972 | |
2973 | va_start(ap, fmt); | |
2974 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2975 | va_end(ap); | |
2976 | if (!str) | |
2977 | return -ENOMEM; | |
2978 | ||
1ec3f75a | 2979 | len = strlen(str); |
8cdc1a81 MD |
2980 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2981 | if (session->priv->metadata_cache->metadata_written + len > | |
2982 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
2983 | char *tmp_cache_realloc; |
2984 | unsigned int tmp_cache_alloc_size; | |
2985 | ||
2986 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
2987 | session->priv->metadata_cache->cache_alloc + len, |
2988 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2989 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2990 | if (!tmp_cache_realloc) |
2991 | goto err; | |
8cdc1a81 | 2992 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 2993 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
2994 | session->priv->metadata_cache->data, |
2995 | session->priv->metadata_cache->cache_alloc); | |
2996 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
2997 | } |
2998 | ||
8cdc1a81 MD |
2999 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3000 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3001 | } |
8cdc1a81 MD |
3002 | memcpy(session->priv->metadata_cache->data + |
3003 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3004 | str, len); |
8cdc1a81 | 3005 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3006 | kfree(str); |
d83004aa | 3007 | |
d83004aa JD |
3008 | return 0; |
3009 | ||
3010 | err: | |
3011 | kfree(str); | |
3012 | return -ENOMEM; | |
c099397a MD |
3013 | } |
3014 | ||
f513b2bf | 3015 | static |
8cdc1a81 | 3016 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3017 | { |
3018 | size_t i; | |
3019 | ||
3020 | for (i = 0; i < nesting; i++) { | |
3021 | int ret; | |
3022 | ||
3023 | ret = lttng_metadata_printf(session, " "); | |
3024 | if (ret) { | |
3025 | return ret; | |
3026 | } | |
3027 | } | |
3028 | return 0; | |
3029 | } | |
3030 | ||
ceabb767 | 3031 | static |
8cdc1a81 | 3032 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3033 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3034 | size_t nesting) |
3035 | { | |
3036 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3037 | } | |
3038 | ||
3039 | static | |
8cdc1a81 | 3040 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3041 | const struct lttng_kernel_type_integer *type, |
3042 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3043 | size_t nesting) |
3044 | { | |
3045 | int ret; | |
3046 | ||
ceabb767 MD |
3047 | ret = print_tabs(session, nesting); |
3048 | if (ret) | |
3049 | return ret; | |
3050 | ret = lttng_metadata_printf(session, | |
3051 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3052 | type->size, |
3053 | type->alignment, | |
3054 | type->signedness, | |
3055 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3056 | ? "none" |
437d5aa5 | 3057 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3058 | ? "UTF8" |
3059 | : "ASCII", | |
437d5aa5 | 3060 | type->base, |
ceabb767 | 3061 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3062 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3063 | #else |
437d5aa5 | 3064 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3065 | #endif |
3066 | ); | |
3067 | return ret; | |
3068 | } | |
3069 | ||
f513b2bf MD |
3070 | /* |
3071 | * Must be called with sessions_mutex held. | |
3072 | */ | |
3073 | static | |
8cdc1a81 | 3074 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3075 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3076 | size_t nesting) |
3077 | { | |
51ef4536 | 3078 | const char *prev_field_name = NULL; |
f513b2bf MD |
3079 | int ret; |
3080 | uint32_t i, nr_fields; | |
ceabb767 MD |
3081 | unsigned int alignment; |
3082 | ||
f513b2bf MD |
3083 | ret = print_tabs(session, nesting); |
3084 | if (ret) | |
3085 | return ret; | |
3086 | ret = lttng_metadata_printf(session, | |
3087 | "struct {\n"); | |
3088 | if (ret) | |
3089 | return ret; | |
437d5aa5 | 3090 | nr_fields = type->nr_fields; |
f513b2bf | 3091 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3092 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3093 | |
437d5aa5 | 3094 | iter_field = type->fields[i]; |
51ef4536 | 3095 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3096 | if (ret) |
3097 | return ret; | |
3098 | } | |
3099 | ret = print_tabs(session, nesting); | |
3100 | if (ret) | |
3101 | return ret; | |
437d5aa5 | 3102 | alignment = type->alignment; |
ceabb767 MD |
3103 | if (alignment) { |
3104 | ret = lttng_metadata_printf(session, | |
3105 | "} align(%u)", | |
3106 | alignment); | |
3107 | } else { | |
3108 | ret = lttng_metadata_printf(session, | |
3109 | "}"); | |
3110 | } | |
f513b2bf MD |
3111 | return ret; |
3112 | } | |
3113 | ||
3114 | /* | |
3115 | * Must be called with sessions_mutex held. | |
3116 | */ | |
3117 | static | |
8cdc1a81 | 3118 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3119 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3120 | size_t nesting) |
3121 | { | |
3122 | int ret; | |
3123 | ||
3124 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3125 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3126 | if (ret) |
3127 | return ret; | |
ceabb767 | 3128 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3129 | } |
3130 | ||
65c85aa6 MD |
3131 | /* |
3132 | * Must be called with sessions_mutex held. | |
3133 | */ | |
3134 | static | |
8cdc1a81 | 3135 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3136 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3137 | size_t nesting, |
3138 | const char *prev_field_name) | |
65c85aa6 | 3139 | { |
51ef4536 | 3140 | const char *tag_name; |
65c85aa6 MD |
3141 | int ret; |
3142 | uint32_t i, nr_choices; | |
3143 | ||
51ef4536 MD |
3144 | tag_name = type->tag_name; |
3145 | if (!tag_name) | |
3146 | tag_name = prev_field_name; | |
3147 | if (!tag_name) | |
3148 | return -EINVAL; | |
ceabb767 MD |
3149 | /* |
3150 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3151 | */ | |
437d5aa5 | 3152 | if (type->alignment != 0) |
ceabb767 | 3153 | return -EINVAL; |
65c85aa6 MD |
3154 | ret = print_tabs(session, nesting); |
3155 | if (ret) | |
3156 | return ret; | |
3157 | ret = lttng_metadata_printf(session, | |
3158 | "variant <_%s> {\n", | |
51ef4536 | 3159 | tag_name); |
65c85aa6 MD |
3160 | if (ret) |
3161 | return ret; | |
437d5aa5 | 3162 | nr_choices = type->nr_choices; |
65c85aa6 | 3163 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3164 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3165 | |
437d5aa5 | 3166 | iter_field = type->choices[i]; |
51ef4536 | 3167 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3168 | if (ret) |
3169 | return ret; | |
3170 | } | |
3171 | ret = print_tabs(session, nesting); | |
3172 | if (ret) | |
3173 | return ret; | |
3174 | ret = lttng_metadata_printf(session, | |
3175 | "}"); | |
3176 | return ret; | |
3177 | } | |
3178 | ||
3179 | /* | |
3180 | * Must be called with sessions_mutex held. | |
3181 | */ | |
3182 | static | |
8cdc1a81 | 3183 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3184 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3185 | size_t nesting, |
3186 | const char *prev_field_name) | |
65c85aa6 MD |
3187 | { |
3188 | int ret; | |
3189 | ||
3190 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3191 | lttng_kernel_get_type_variant(field->type), nesting, |
3192 | prev_field_name); | |
65c85aa6 MD |
3193 | if (ret) |
3194 | return ret; | |
ceabb767 | 3195 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3196 | } |
3197 | ||
f513b2bf MD |
3198 | /* |
3199 | * Must be called with sessions_mutex held. | |
3200 | */ | |
3201 | static | |
8cdc1a81 | 3202 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3203 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3204 | size_t nesting) |
3205 | { | |
3206 | int ret; | |
437d5aa5 MD |
3207 | const struct lttng_kernel_type_array *array_type; |
3208 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3209 | |
437d5aa5 MD |
3210 | array_type = lttng_kernel_get_type_array(field->type); |
3211 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3212 | |
437d5aa5 | 3213 | if (array_type->alignment) { |
ceabb767 | 3214 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3215 | if (ret) |
3216 | return ret; | |
ceabb767 MD |
3217 | ret = lttng_metadata_printf(session, |
3218 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3219 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3220 | field->name); |
3221 | if (ret) | |
3222 | return ret; | |
3223 | } | |
3224 | /* | |
3225 | * Nested compound types: Only array of structures and variants are | |
3226 | * currently supported. | |
3227 | */ | |
437d5aa5 | 3228 | elem_type = array_type->elem_type; |
12bb2edb MD |
3229 | switch (elem_type->type) { |
3230 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3231 | case lttng_kernel_type_struct: |
3232 | case lttng_kernel_type_variant: | |
3233 | ret = _lttng_type_statedump(session, elem_type, | |
3234 | array_type->encoding, nesting); | |
65c85aa6 MD |
3235 | if (ret) |
3236 | return ret; | |
3237 | break; | |
ceabb767 | 3238 | |
f513b2bf MD |
3239 | default: |
3240 | return -EINVAL; | |
3241 | } | |
3242 | ret = lttng_metadata_printf(session, | |
3243 | " _%s[%u];\n", | |
3244 | field->name, | |
437d5aa5 | 3245 | array_type->length); |
f513b2bf MD |
3246 | return ret; |
3247 | } | |
3248 | ||
3249 | /* | |
3250 | * Must be called with sessions_mutex held. | |
3251 | */ | |
3252 | static | |
8cdc1a81 | 3253 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3254 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3255 | size_t nesting, |
3256 | const char *prev_field_name) | |
f513b2bf MD |
3257 | { |
3258 | int ret; | |
3259 | const char *length_name; | |
437d5aa5 MD |
3260 | const struct lttng_kernel_type_sequence *sequence_type; |
3261 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3262 | |
437d5aa5 MD |
3263 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3264 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3265 | |
437d5aa5 | 3266 | length_name = sequence_type->length_name; |
51ef4536 MD |
3267 | if (!length_name) |
3268 | length_name = prev_field_name; | |
3269 | if (!length_name) | |
3270 | return -EINVAL; | |
ceabb767 | 3271 | |
437d5aa5 | 3272 | if (sequence_type->alignment) { |
ceabb767 | 3273 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3274 | if (ret) |
3275 | return ret; | |
ceabb767 MD |
3276 | ret = lttng_metadata_printf(session, |
3277 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3278 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3279 | field->name); |
3280 | if (ret) | |
3281 | return ret; | |
3282 | } | |
3283 | ||
3284 | /* | |
3285 | * Nested compound types: Only array of structures and variants are | |
3286 | * currently supported. | |
3287 | */ | |
437d5aa5 | 3288 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3289 | switch (elem_type->type) { |
3290 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3291 | case lttng_kernel_type_struct: |
3292 | case lttng_kernel_type_variant: | |
3293 | ret = _lttng_type_statedump(session, elem_type, | |
3294 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3295 | if (ret) |
3296 | return ret; | |
3297 | break; | |
ceabb767 | 3298 | |
f513b2bf MD |
3299 | default: |
3300 | return -EINVAL; | |
3301 | } | |
3302 | ret = lttng_metadata_printf(session, | |
3303 | " _%s[ _%s ];\n", | |
3304 | field->name, | |
51ef4536 | 3305 | length_name); |
f513b2bf MD |
3306 | return ret; |
3307 | } | |
3308 | ||
141ddf28 MD |
3309 | /* |
3310 | * Must be called with sessions_mutex held. | |
3311 | */ | |
3312 | static | |
8cdc1a81 | 3313 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3314 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3315 | size_t nesting) |
3316 | { | |
d96a4a7a | 3317 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3318 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3319 | int ret; |
3320 | unsigned int i, nr_entries; | |
3321 | ||
437d5aa5 | 3322 | container_type = type->container_type; |
12bb2edb | 3323 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3324 | ret = -EINVAL; |
3325 | goto end; | |
3326 | } | |
437d5aa5 | 3327 | enum_desc = type->desc; |
141ddf28 MD |
3328 | nr_entries = enum_desc->nr_entries; |
3329 | ||
3330 | ret = print_tabs(session, nesting); | |
3331 | if (ret) | |
3332 | goto end; | |
ceabb767 MD |
3333 | ret = lttng_metadata_printf(session, "enum : "); |
3334 | if (ret) | |
3335 | goto end; | |
437d5aa5 MD |
3336 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3337 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3338 | if (ret) |
ceabb767 MD |
3339 | goto end; |
3340 | ret = lttng_metadata_printf(session, " {\n"); | |
3341 | if (ret) | |
3342 | goto end; | |
141ddf28 MD |
3343 | /* Dump all entries */ |
3344 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3345 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3346 | int j, len; |
3347 | ||
3348 | ret = print_tabs(session, nesting + 1); | |
3349 | if (ret) | |
3350 | goto end; | |
3351 | ret = lttng_metadata_printf(session, | |
3352 | "\""); | |
3353 | if (ret) | |
3354 | goto end; | |
3355 | len = strlen(entry->string); | |
3356 | /* Escape the character '"' */ | |
3357 | for (j = 0; j < len; j++) { | |
3358 | char c = entry->string[j]; | |
3359 | ||
3360 | switch (c) { | |
3361 | case '"': | |
3362 | ret = lttng_metadata_printf(session, | |
3363 | "\\\""); | |
3364 | break; | |
3365 | case '\\': | |
3366 | ret = lttng_metadata_printf(session, | |
3367 | "\\\\"); | |
3368 | break; | |
3369 | default: | |
3370 | ret = lttng_metadata_printf(session, | |
3371 | "%c", c); | |
3372 | break; | |
3373 | } | |
3374 | if (ret) | |
3375 | goto end; | |
3376 | } | |
08ad1061 PP |
3377 | ret = lttng_metadata_printf(session, "\""); |
3378 | if (ret) | |
3379 | goto end; | |
3380 | ||
3381 | if (entry->options.is_auto) { | |
3382 | ret = lttng_metadata_printf(session, ",\n"); | |
3383 | if (ret) | |
3384 | goto end; | |
141ddf28 | 3385 | } else { |
7c559490 MD |
3386 | ret = lttng_metadata_printf(session, |
3387 | " = "); | |
3388 | if (ret) | |
3389 | goto end; | |
3390 | if (entry->start.signedness) | |
141ddf28 | 3391 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3392 | "%lld", (long long) entry->start.value); |
3393 | else | |
3394 | ret = lttng_metadata_printf(session, | |
3395 | "%llu", entry->start.value); | |
3396 | if (ret) | |
3397 | goto end; | |
3398 | if (entry->start.signedness == entry->end.signedness && | |
3399 | entry->start.value | |
3400 | == entry->end.value) { | |
141ddf28 | 3401 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3402 | ",\n"); |
3403 | } else { | |
3404 | if (entry->end.signedness) { | |
3405 | ret = lttng_metadata_printf(session, | |
3406 | " ... %lld,\n", | |
3407 | (long long) entry->end.value); | |
3408 | } else { | |
3409 | ret = lttng_metadata_printf(session, | |
3410 | " ... %llu,\n", | |
3411 | entry->end.value); | |
3412 | } | |
141ddf28 | 3413 | } |
7c559490 MD |
3414 | if (ret) |
3415 | goto end; | |
141ddf28 | 3416 | } |
141ddf28 MD |
3417 | } |
3418 | ret = print_tabs(session, nesting); | |
3419 | if (ret) | |
3420 | goto end; | |
ceabb767 | 3421 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3422 | end: |
3423 | return ret; | |
3424 | } | |
3425 | ||
d83004aa JD |
3426 | /* |
3427 | * Must be called with sessions_mutex held. | |
3428 | */ | |
c099397a | 3429 | static |
8cdc1a81 | 3430 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3431 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3432 | size_t nesting) |
3433 | { | |
3434 | int ret; | |
437d5aa5 | 3435 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3436 | |
437d5aa5 MD |
3437 | enum_type = lttng_kernel_get_type_enum(field->type); |
3438 | WARN_ON_ONCE(!enum_type); | |
3439 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3440 | if (ret) |
3441 | return ret; | |
3442 | return lttng_field_name_statedump(session, field, nesting); | |
3443 | } | |
3444 | ||
3445 | static | |
8cdc1a81 | 3446 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3447 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3448 | size_t nesting) |
3449 | { | |
3450 | int ret; | |
3451 | ||
437d5aa5 MD |
3452 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3453 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3454 | if (ret) |
3455 | return ret; | |
3456 | return lttng_field_name_statedump(session, field, nesting); | |
3457 | } | |
3458 | ||
3459 | static | |
8cdc1a81 | 3460 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3461 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3462 | size_t nesting) |
3463 | { | |
3464 | int ret; | |
3465 | ||
ceabb767 MD |
3466 | /* Default encoding is UTF8 */ |
3467 | ret = print_tabs(session, nesting); | |
3468 | if (ret) | |
3469 | return ret; | |
3470 | ret = lttng_metadata_printf(session, | |
3471 | "string%s", | |
437d5aa5 | 3472 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3473 | " { encoding = ASCII; }" : ""); |
3474 | return ret; | |
3475 | } | |
3476 | ||
3477 | static | |
8cdc1a81 | 3478 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3479 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3480 | size_t nesting) |
ceabb767 | 3481 | { |
437d5aa5 | 3482 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3483 | int ret; |
3484 | ||
437d5aa5 MD |
3485 | string_type = lttng_kernel_get_type_string(field->type); |
3486 | WARN_ON_ONCE(!string_type); | |
3487 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3488 | if (ret) |
3489 | return ret; | |
3490 | return lttng_field_name_statedump(session, field, nesting); | |
3491 | } | |
3492 | ||
3493 | /* | |
3494 | * Must be called with sessions_mutex held. | |
3495 | */ | |
3496 | static | |
8cdc1a81 | 3497 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3498 | const struct lttng_kernel_type_common *type, |
3499 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3500 | size_t nesting) |
c099397a | 3501 | { |
c099397a | 3502 | int ret = 0; |
c099397a | 3503 | |
12bb2edb MD |
3504 | switch (type->type) { |
3505 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3506 | ret = _lttng_integer_type_statedump(session, |
3507 | lttng_kernel_get_type_integer(type), | |
3508 | parent_encoding, nesting); | |
8070f5c0 | 3509 | break; |
437d5aa5 MD |
3510 | case lttng_kernel_type_enum: |
3511 | ret = _lttng_enum_type_statedump(session, | |
3512 | lttng_kernel_get_type_enum(type), | |
3513 | nesting); | |
8070f5c0 | 3514 | break; |
12bb2edb | 3515 | case lttng_kernel_type_string: |
437d5aa5 MD |
3516 | ret = _lttng_string_type_statedump(session, |
3517 | lttng_kernel_get_type_string(type), | |
3518 | nesting); | |
ceabb767 | 3519 | break; |
437d5aa5 MD |
3520 | case lttng_kernel_type_struct: |
3521 | ret = _lttng_struct_type_statedump(session, | |
3522 | lttng_kernel_get_type_struct(type), | |
3523 | nesting); | |
8070f5c0 | 3524 | break; |
437d5aa5 MD |
3525 | case lttng_kernel_type_variant: |
3526 | ret = _lttng_variant_type_statedump(session, | |
3527 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3528 | nesting, NULL); |
ceabb767 MD |
3529 | break; |
3530 | ||
3531 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3532 | case lttng_kernel_type_array: |
3533 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3534 | default: |
3535 | WARN_ON_ONCE(1); | |
3536 | return -EINVAL; | |
8070f5c0 | 3537 | } |
ceabb767 MD |
3538 | return ret; |
3539 | } | |
8070f5c0 | 3540 | |
ceabb767 MD |
3541 | /* |
3542 | * Must be called with sessions_mutex held. | |
3543 | */ | |
3544 | static | |
8cdc1a81 | 3545 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3546 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3547 | size_t nesting, |
3548 | const char **prev_field_name_p) | |
ceabb767 | 3549 | { |
51ef4536 | 3550 | const char *prev_field_name = NULL; |
ceabb767 | 3551 | int ret = 0; |
27d2368e | 3552 | |
51ef4536 MD |
3553 | if (prev_field_name_p) |
3554 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3555 | switch (field->type->type) { |
12bb2edb | 3556 | case lttng_kernel_type_integer: |
ceabb767 MD |
3557 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3558 | break; | |
437d5aa5 | 3559 | case lttng_kernel_type_enum: |
ceabb767 | 3560 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3561 | break; |
12bb2edb | 3562 | case lttng_kernel_type_string: |
ceabb767 | 3563 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3564 | break; |
437d5aa5 | 3565 | case lttng_kernel_type_struct: |
ceabb767 | 3566 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3567 | break; |
437d5aa5 | 3568 | case lttng_kernel_type_array: |
ceabb767 | 3569 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3570 | break; |
437d5aa5 | 3571 | case lttng_kernel_type_sequence: |
51ef4536 | 3572 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3573 | break; |
437d5aa5 | 3574 | case lttng_kernel_type_variant: |
51ef4536 | 3575 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3576 | break; |
f513b2bf | 3577 | |
8070f5c0 MD |
3578 | default: |
3579 | WARN_ON_ONCE(1); | |
3580 | return -EINVAL; | |
3581 | } | |
51ef4536 MD |
3582 | if (prev_field_name_p) |
3583 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3584 | return ret; |
3585 | } | |
3586 | ||
3587 | static | |
8cdc1a81 | 3588 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3589 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3590 | { |
51ef4536 | 3591 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3592 | int ret = 0; |
3593 | int i; | |
3594 | ||
3595 | if (!ctx) | |
3596 | return 0; | |
3597 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3598 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3599 | |
51ef4536 | 3600 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3601 | if (ret) |
3602 | return ret; | |
3603 | } | |
3604 | return ret; | |
3605 | } | |
3606 | ||
3607 | static | |
8cdc1a81 | 3608 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3609 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3610 | { |
51ef4536 | 3611 | const char *prev_field_name = NULL; |
a67ba386 | 3612 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3613 | int ret = 0; |
3614 | int i; | |
3615 | ||
6c8c025b MD |
3616 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3617 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3618 | |
51ef4536 | 3619 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3620 | if (ret) |
3621 | return ret; | |
c099397a MD |
3622 | } |
3623 | return ret; | |
3624 | } | |
3625 | ||
d83004aa JD |
3626 | /* |
3627 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3628 | * The entire event metadata is printed as a single atomic metadata |
3629 | * transaction. | |
d83004aa | 3630 | */ |
c099397a | 3631 | static |
8cdc1a81 | 3632 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3633 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3634 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3635 | { |
3636 | int ret = 0; | |
3637 | ||
a67ba386 | 3638 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3639 | return 0; |
f7d06400 | 3640 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3641 | return 0; |
3642 | ||
8b97fd42 MD |
3643 | lttng_metadata_begin(session); |
3644 | ||
c099397a MD |
3645 | ret = lttng_metadata_printf(session, |
3646 | "event {\n" | |
ae734547 | 3647 | " name = \"%s\";\n" |
c099397a | 3648 | " id = %u;\n" |
b9074a1b | 3649 | " stream_id = %u;\n", |
a67ba386 MD |
3650 | event_recorder->priv->parent.desc->event_name, |
3651 | event_recorder->priv->id, | |
f7d06400 | 3652 | event_recorder->chan->priv->id); |
c099397a MD |
3653 | if (ret) |
3654 | goto end; | |
3655 | ||
8070f5c0 | 3656 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3657 | " fields := struct {\n" |
3658 | ); | |
3659 | if (ret) | |
3660 | goto end; | |
3661 | ||
a67ba386 | 3662 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3663 | if (ret) |
3664 | goto end; | |
3665 | ||
3666 | /* | |
3667 | * LTTng space reservation can only reserve multiples of the | |
3668 | * byte size. | |
3669 | */ | |
3670 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3671 | " };\n" |
3672 | "};\n\n"); | |
c099397a MD |
3673 | if (ret) |
3674 | goto end; | |
3675 | ||
a67ba386 | 3676 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3677 | end: |
8b97fd42 | 3678 | lttng_metadata_end(session); |
c099397a MD |
3679 | return ret; |
3680 | ||
3681 | } | |
3682 | ||
d83004aa JD |
3683 | /* |
3684 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3685 | * The entire channel metadata is printed as a single atomic metadata |
3686 | * transaction. | |
d83004aa | 3687 | */ |
c099397a | 3688 | static |
8cdc1a81 | 3689 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3690 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3691 | { |
3692 | int ret = 0; | |
3693 | ||
f7d06400 | 3694 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3695 | return 0; |
d83004aa | 3696 | |
f7d06400 | 3697 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3698 | return 0; |
3699 | ||
8b97fd42 MD |
3700 | lttng_metadata_begin(session); |
3701 | ||
f7d06400 | 3702 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3703 | ret = lttng_metadata_printf(session, |
3704 | "stream {\n" | |
3705 | " id = %u;\n" | |
9115fbdc | 3706 | " event.header := %s;\n" |
b9074a1b | 3707 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3708 | chan->priv->id, |
3709 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3710 | "struct event_header_large"); |
3711 | if (ret) | |
3712 | goto end; | |
3713 | ||
f7d06400 | 3714 | if (chan->priv->ctx) { |
b9074a1b MD |
3715 | ret = lttng_metadata_printf(session, |
3716 | " event.context := struct {\n"); | |
3717 | if (ret) | |
3718 | goto end; | |
3719 | } | |
f7d06400 | 3720 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3721 | if (ret) |
3722 | goto end; | |
f7d06400 | 3723 | if (chan->priv->ctx) { |
b9074a1b MD |
3724 | ret = lttng_metadata_printf(session, |
3725 | " };\n"); | |
3726 | if (ret) | |
3727 | goto end; | |
3728 | } | |
8070f5c0 MD |
3729 | |
3730 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3731 | "};\n\n"); |
8070f5c0 | 3732 | |
f7d06400 | 3733 | chan->priv->metadata_dumped = 1; |
c099397a | 3734 | end: |
8b97fd42 | 3735 | lttng_metadata_end(session); |
c099397a MD |
3736 | return ret; |
3737 | } | |
3738 | ||
d83004aa JD |
3739 | /* |
3740 | * Must be called with sessions_mutex held. | |
3741 | */ | |
9115fbdc | 3742 | static |
8cdc1a81 | 3743 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3744 | { |
3745 | return lttng_metadata_printf(session, | |
3746 | "struct packet_context {\n" | |
a3ccff4f MD |
3747 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3748 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3749 | " uint64_t content_size;\n" |
3750 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3751 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3752 | " unsigned long events_discarded;\n" |
9115fbdc | 3753 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3754 | "};\n\n" |
9115fbdc MD |
3755 | ); |
3756 | } | |
3757 | ||
3758 | /* | |
3759 | * Compact header: | |
3760 | * id: range: 0 - 30. | |
3761 | * id 31 is reserved to indicate an extended header. | |
3762 | * | |
3763 | * Large header: | |
3764 | * id: range: 0 - 65534. | |
3765 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3766 | * |
3767 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3768 | */ |
3769 | static | |
8cdc1a81 | 3770 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3771 | { |
3772 | return lttng_metadata_printf(session, | |
3773 | "struct event_header_compact {\n" | |
3774 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3775 | " variant <id> {\n" | |
3776 | " struct {\n" | |
a3ccff4f | 3777 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3778 | " } compact;\n" |
3779 | " struct {\n" | |
3780 | " uint32_t id;\n" | |
a3ccff4f | 3781 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3782 | " } extended;\n" |
3783 | " } v;\n" | |
3784 | "} align(%u);\n" | |
3785 | "\n" | |
3786 | "struct event_header_large {\n" | |
3787 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3788 | " variant <id> {\n" | |
3789 | " struct {\n" | |
a3ccff4f | 3790 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3791 | " } compact;\n" |
3792 | " struct {\n" | |
3793 | " uint32_t id;\n" | |
a3ccff4f | 3794 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3795 | " } extended;\n" |
3796 | " } v;\n" | |
3797 | "} align(%u);\n\n", | |
a90917c3 MD |
3798 | lttng_alignof(uint32_t) * CHAR_BIT, |
3799 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3800 | ); |
3801 | } | |
3802 | ||
a3ccff4f MD |
3803 | /* |
3804 | * Approximation of NTP time of day to clock monotonic correlation, | |
3805 | * taken at start of trace. | |
3806 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3807 | * in future versions. | |
5283350b MD |
3808 | * This function may return a negative offset. It may happen if the |
3809 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3810 | * |
3811 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3812 | * y2038 compliant. | |
a3ccff4f MD |
3813 | */ |
3814 | static | |
8967b2a3 | 3815 | int64_t measure_clock_offset(void) |
a3ccff4f | 3816 | { |
dcb93448 | 3817 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3818 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3819 | int64_t offset; |
a3ccff4f | 3820 | unsigned long flags; |
3636085f MJ |
3821 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3822 | struct timespec64 rts = { 0, 0 }; | |
3823 | #else | |
3824 | struct timespec rts = { 0, 0 }; | |
3825 | #endif | |
a3ccff4f MD |
3826 | |
3827 | /* Disable interrupts to increase correlation precision. */ | |
3828 | local_irq_save(flags); | |
3829 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3830 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3831 | ktime_get_real_ts64(&rts); | |
3832 | #else | |
216b6baa | 3833 | getnstimeofday(&rts); |
3636085f | 3834 | #endif |
a3ccff4f MD |
3835 | monotonic[1] = trace_clock_read64(); |
3836 | local_irq_restore(flags); | |
3837 | ||
dcb93448 | 3838 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3839 | realtime = (uint64_t) rts.tv_sec * tcf; |
3840 | if (tcf == NSEC_PER_SEC) { | |
3841 | realtime += rts.tv_nsec; | |
3842 | } else { | |
3843 | uint64_t n = rts.tv_nsec * tcf; | |
3844 | ||
3845 | do_div(n, NSEC_PER_SEC); | |
3846 | realtime += n; | |
3847 | } | |
dcb93448 | 3848 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3849 | return offset; |
3850 | } | |
3851 | ||
3eb95be4 | 3852 | static |
8cdc1a81 | 3853 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3854 | { |
0f3eaad4 | 3855 | int ret = 0; |
3eb95be4 JR |
3856 | size_t i; |
3857 | char cur; | |
3858 | ||
3859 | i = 0; | |
3860 | cur = string[i]; | |
3861 | while (cur != '\0') { | |
3862 | switch (cur) { | |
3863 | case '\n': | |
3864 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3865 | break; | |
3866 | case '\\': | |
3867 | case '"': | |
3868 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3869 | if (ret) | |
3870 | goto error; | |
3871 | /* We still print the current char */ | |
c190d76e | 3872 | lttng_fallthrough; |
3eb95be4 JR |
3873 | default: |
3874 | ret = lttng_metadata_printf(session, "%c", cur); | |
3875 | break; | |
3876 | } | |
3877 | ||
3878 | if (ret) | |
3879 | goto error; | |
3880 | ||
3881 | cur = string[++i]; | |
3882 | } | |
3883 | error: | |
3884 | return ret; | |
3885 | } | |
3886 | ||
3887 | static | |
8cdc1a81 | 3888 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3889 | const char *field_value) |
3eb95be4 JR |
3890 | { |
3891 | int ret; | |
3892 | ||
1c88f269 | 3893 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3894 | if (ret) |
3895 | goto error; | |
3896 | ||
1c88f269 | 3897 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3898 | if (ret) |
3899 | goto error; | |
3900 | ||
3901 | ret = lttng_metadata_printf(session, "\";\n"); | |
3902 | ||
3903 | error: | |
3904 | return ret; | |
3905 | } | |
3906 | ||
c099397a MD |
3907 | /* |
3908 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3909 | * Must be called with sessions_mutex held. |
c099397a MD |
3910 | */ |
3911 | static | |
8cdc1a81 | 3912 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3913 | { |
8cdc1a81 | 3914 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3915 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3916 | const char *product_uuid; |
f7d06400 | 3917 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3918 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3919 | int ret = 0; |
3920 | ||
585e5dcc | 3921 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3922 | return 0; |
8b97fd42 MD |
3923 | |
3924 | lttng_metadata_begin(session); | |
3925 | ||
8cdc1a81 | 3926 | if (session->priv->metadata_dumped) |
c099397a | 3927 | goto skip_session; |
c099397a | 3928 | |
d793d5e1 | 3929 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3930 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3931 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3932 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3933 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3934 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3935 | |
3936 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3937 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3938 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3939 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3940 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3941 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3942 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3943 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3944 | "\n" |
3945 | "trace {\n" | |
3946 | " major = %u;\n" | |
3947 | " minor = %u;\n" | |
30bdb6e4 | 3948 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3949 | " byte_order = %s;\n" |
3950 | " packet.header := struct {\n" | |
3951 | " uint32_t magic;\n" | |
1ec3f75a | 3952 | " uint8_t uuid[16];\n" |
d793d5e1 | 3953 | " uint32_t stream_id;\n" |
5594698f | 3954 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3955 | " };\n" |
d793d5e1 | 3956 | "};\n\n", |
a90917c3 MD |
3957 | lttng_alignof(uint8_t) * CHAR_BIT, |
3958 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3959 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3960 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3961 | sizeof(unsigned long) * CHAR_BIT, |
3962 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3963 | CTF_SPEC_MAJOR, |
3964 | CTF_SPEC_MINOR, | |
d793d5e1 | 3965 | uuid_s, |
5214fa50 | 3966 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3967 | "be" |
3968 | #else | |
3969 | "le" | |
3970 | #endif | |
3971 | ); | |
3972 | if (ret) | |
3973 | goto end; | |
3974 | ||
99dc9597 MD |
3975 | ret = lttng_metadata_printf(session, |
3976 | "env {\n" | |
a6058143 | 3977 | " hostname = \"%s\";\n" |
c6c9e10f | 3978 | " domain = \"kernel\";\n" |
99dc9597 | 3979 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3980 | " kernel_release = \"%s\";\n" |
3981 | " kernel_version = \"%s\";\n" | |
3982 | " tracer_name = \"lttng-modules\";\n" | |
3983 | " tracer_major = %d;\n" | |
3984 | " tracer_minor = %d;\n" | |
3985 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3986 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3987 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3988 | utsname()->sysname, |
3989 | utsname()->release, | |
c6c9e10f MD |
3990 | utsname()->version, |
3991 | LTTNG_MODULES_MAJOR_VERSION, | |
3992 | LTTNG_MODULES_MINOR_VERSION, | |
3993 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3994 | ); |
3995 | if (ret) | |
3996 | goto end; | |
3997 | ||
8cdc1a81 | 3998 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
3999 | if (ret) |
4000 | goto end; | |
4001 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 4002 | session->priv->creation_time); |
3eb95be4 JR |
4003 | if (ret) |
4004 | goto end; | |
4005 | ||
c88f762e GB |
4006 | /* Add the product UUID to the 'env' section */ |
4007 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4008 | if (product_uuid) { | |
4009 | ret = lttng_metadata_printf(session, | |
4010 | " product_uuid = \"%s\";\n", | |
4011 | product_uuid | |
4012 | ); | |
4013 | if (ret) | |
4014 | goto end; | |
4015 | } | |
4016 | ||
4017 | /* Close the 'env' section */ | |
3eb95be4 JR |
4018 | ret = lttng_metadata_printf(session, "};\n\n"); |
4019 | if (ret) | |
4020 | goto end; | |
4021 | ||
a3ccff4f MD |
4022 | ret = lttng_metadata_printf(session, |
4023 | "clock {\n" | |
2754583e MD |
4024 | " name = \"%s\";\n", |
4025 | trace_clock_name() | |
a82c63f1 MD |
4026 | ); |
4027 | if (ret) | |
4028 | goto end; | |
4029 | ||
4030 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4031 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4032 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4033 | clock_uuid_s |
4034 | ); | |
4035 | if (ret) | |
4036 | goto end; | |
4037 | } | |
4038 | ||
4039 | ret = lttng_metadata_printf(session, | |
2754583e | 4040 | " description = \"%s\";\n" |
a3ccff4f MD |
4041 | " freq = %llu; /* Frequency, in Hz */\n" |
4042 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4043 | " offset = %lld;\n" |
a3ccff4f | 4044 | "};\n\n", |
2754583e | 4045 | trace_clock_description(), |
a3ccff4f | 4046 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4047 | (long long) measure_clock_offset() |
a3ccff4f MD |
4048 | ); |
4049 | if (ret) | |
4050 | goto end; | |
4051 | ||
4052 | ret = lttng_metadata_printf(session, | |
4053 | "typealias integer {\n" | |
4054 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4055 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4056 | "} := uint27_clock_monotonic_t;\n" |
4057 | "\n" | |
4058 | "typealias integer {\n" | |
4059 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4060 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4061 | "} := uint32_clock_monotonic_t;\n" |
4062 | "\n" | |
4063 | "typealias integer {\n" | |
4064 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4065 | " map = clock.%s.value;\n" |
a3ccff4f | 4066 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4067 | trace_clock_name(), |
a3ccff4f | 4068 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4069 | trace_clock_name(), |
4070 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4071 | trace_clock_name() | |
a3ccff4f MD |
4072 | ); |
4073 | if (ret) | |
4074 | goto end; | |
4075 | ||
a90917c3 | 4076 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4077 | if (ret) |
4078 | goto end; | |
4079 | ||
a90917c3 | 4080 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4081 | if (ret) |
4082 | goto end; | |
4083 | ||
c099397a | 4084 | skip_session: |
f7d06400 MD |
4085 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4086 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4087 | if (ret) |
4088 | goto end; | |
4089 | } | |
4090 | ||
8cdc1a81 | 4091 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4092 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4093 | event_recorder_priv->pub); | |
c099397a MD |
4094 | if (ret) |
4095 | goto end; | |
4096 | } | |
8cdc1a81 | 4097 | session->priv->metadata_dumped = 1; |
c099397a | 4098 | end: |
8b97fd42 | 4099 | lttng_metadata_end(session); |
c099397a MD |
4100 | return ret; |
4101 | } | |
4102 | ||
c0e31d2e | 4103 | /** |
a90917c3 | 4104 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4105 | * @transport: transport structure |
4106 | * | |
4107 | * Registers a transport which can be used as output to extract the data out of | |
4108 | * LTTng. The module calling this registration function must ensure that no | |
4109 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4110 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4111 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4112 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4113 | * after its registration must it synchronize the TLBs. |
4114 | */ | |
a90917c3 | 4115 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4116 | { |
4117 | /* | |
4118 | * Make sure no page fault can be triggered by the module about to be | |
4119 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4120 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4121 | */ |
263b6c88 | 4122 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4123 | |
4124 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4125 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4126 | mutex_unlock(&sessions_mutex); |
4127 | } | |
a90917c3 | 4128 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4129 | |
4130 | /** | |
a90917c3 | 4131 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4132 | * @transport: transport structure |
4133 | */ | |
a90917c3 | 4134 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4135 | { |
4136 | mutex_lock(&sessions_mutex); | |
4137 | list_del(&transport->node); | |
4138 | mutex_unlock(&sessions_mutex); | |
4139 | } | |
a90917c3 | 4140 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4141 | |
a101fa10 MD |
4142 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4143 | { | |
4144 | /* | |
4145 | * Make sure no page fault can be triggered by the module about to be | |
4146 | * registered. We deal with this here so we don't have to call | |
4147 | * vmalloc_sync_mappings() in each module's init. | |
4148 | */ | |
4149 | wrapper_vmalloc_sync_mappings(); | |
4150 | ||
4151 | mutex_lock(&sessions_mutex); | |
4152 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4153 | mutex_unlock(&sessions_mutex); | |
4154 | } | |
4155 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4156 | ||
4157 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4158 | { | |
4159 | mutex_lock(&sessions_mutex); | |
4160 | list_del(&transport->node); | |
4161 | mutex_unlock(&sessions_mutex); | |
4162 | } | |
4163 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4164 | ||
5f4c791e | 4165 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4166 | |
4167 | enum cpuhp_state lttng_hp_prepare; | |
4168 | enum cpuhp_state lttng_hp_online; | |
4169 | ||
4170 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4171 | { | |
4172 | struct lttng_cpuhp_node *lttng_node; | |
4173 | ||
4174 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4175 | switch (lttng_node->component) { | |
4176 | case LTTNG_RING_BUFFER_FRONTEND: | |
4177 | return 0; | |
4178 | case LTTNG_RING_BUFFER_BACKEND: | |
4179 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4180 | case LTTNG_RING_BUFFER_ITER: | |
4181 | return 0; | |
4182 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4183 | return 0; | |
4184 | default: | |
4185 | return -EINVAL; | |
4186 | } | |
4187 | } | |
4188 | ||
4189 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4190 | { | |
4191 | struct lttng_cpuhp_node *lttng_node; | |
4192 | ||
4193 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4194 | switch (lttng_node->component) { | |
4195 | case LTTNG_RING_BUFFER_FRONTEND: | |
4196 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4197 | case LTTNG_RING_BUFFER_BACKEND: | |
4198 | return 0; | |
4199 | case LTTNG_RING_BUFFER_ITER: | |
4200 | return 0; | |
4201 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4202 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4203 | default: | |
4204 | return -EINVAL; | |
4205 | } | |
4206 | } | |
4207 | ||
4208 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4209 | { | |
4210 | struct lttng_cpuhp_node *lttng_node; | |
4211 | ||
4212 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4213 | switch (lttng_node->component) { | |
4214 | case LTTNG_RING_BUFFER_FRONTEND: | |
4215 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4216 | case LTTNG_RING_BUFFER_BACKEND: | |
4217 | return 0; | |
4218 | case LTTNG_RING_BUFFER_ITER: | |
4219 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4220 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4221 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4222 | default: | |
4223 | return -EINVAL; | |
4224 | } | |
4225 | } | |
4226 | ||
4227 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4228 | { | |
4229 | struct lttng_cpuhp_node *lttng_node; | |
4230 | ||
4231 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4232 | switch (lttng_node->component) { | |
4233 | case LTTNG_RING_BUFFER_FRONTEND: | |
4234 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4235 | case LTTNG_RING_BUFFER_BACKEND: | |
4236 | return 0; | |
4237 | case LTTNG_RING_BUFFER_ITER: | |
4238 | return 0; | |
4239 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4240 | return 0; | |
4241 | default: | |
4242 | return -EINVAL; | |
4243 | } | |
4244 | } | |
4245 | ||
4246 | static int __init lttng_init_cpu_hotplug(void) | |
4247 | { | |
4248 | int ret; | |
4249 | ||
4250 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4251 | lttng_hotplug_prepare, | |
4252 | lttng_hotplug_dead); | |
4253 | if (ret < 0) { | |
4254 | return ret; | |
4255 | } | |
4256 | lttng_hp_prepare = ret; | |
4257 | lttng_rb_set_hp_prepare(ret); | |
4258 | ||
4259 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4260 | lttng_hotplug_online, | |
4261 | lttng_hotplug_offline); | |
4262 | if (ret < 0) { | |
4263 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4264 | lttng_hp_prepare = 0; | |
4265 | return ret; | |
4266 | } | |
4267 | lttng_hp_online = ret; | |
4268 | lttng_rb_set_hp_online(ret); | |
4269 | ||
4270 | return 0; | |
4271 | } | |
4272 | ||
4273 | static void __exit lttng_exit_cpu_hotplug(void) | |
4274 | { | |
4275 | lttng_rb_set_hp_online(0); | |
4276 | cpuhp_remove_multi_state(lttng_hp_online); | |
4277 | lttng_rb_set_hp_prepare(0); | |
4278 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4279 | } | |
4280 | ||
5f4c791e | 4281 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4282 | static int lttng_init_cpu_hotplug(void) |
4283 | { | |
4284 | return 0; | |
4285 | } | |
4286 | static void lttng_exit_cpu_hotplug(void) | |
4287 | { | |
4288 | } | |
5f4c791e | 4289 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4290 | |
a90917c3 | 4291 | static int __init lttng_events_init(void) |
4e3c1b9b | 4292 | { |
1c25284c MD |
4293 | int ret; |
4294 | ||
453b2495 JD |
4295 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4296 | if (ret) | |
4297 | return ret; | |
389d7070 | 4298 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4299 | if (ret) |
4300 | return ret; | |
4301 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4302 | if (ret) |
4303 | return ret; | |
4304 | ret = lttng_probes_init(); | |
389d7070 MD |
4305 | if (ret) |
4306 | return ret; | |
07dfc1d0 | 4307 | ret = lttng_context_init(); |
20591cf7 MD |
4308 | if (ret) |
4309 | return ret; | |
07dfc1d0 MD |
4310 | ret = lttng_tracepoint_init(); |
4311 | if (ret) | |
4312 | goto error_tp; | |
a67ba386 MD |
4313 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4314 | if (!event_recorder_cache) { | |
20591cf7 | 4315 | ret = -ENOMEM; |
a67ba386 | 4316 | goto error_kmem_event_recorder; |
dffef45d | 4317 | } |
a67ba386 MD |
4318 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4319 | if (!event_recorder_private_cache) { | |
4320 | ret = -ENOMEM; | |
4321 | goto error_kmem_event_recorder_private; | |
4322 | } | |
4323 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4324 | if (!event_notifier_cache) { |
4325 | ret = -ENOMEM; | |
4326 | goto error_kmem_event_notifier; | |
20591cf7 | 4327 | } |
a67ba386 MD |
4328 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4329 | if (!event_notifier_private_cache) { | |
4330 | ret = -ENOMEM; | |
4331 | goto error_kmem_event_notifier_private; | |
4332 | } | |
80996790 | 4333 | ret = lttng_abi_init(); |
02119ee5 MD |
4334 | if (ret) |
4335 | goto error_abi; | |
0c956676 MD |
4336 | ret = lttng_logger_init(); |
4337 | if (ret) | |
4338 | goto error_logger; | |
1e367326 MD |
4339 | ret = lttng_init_cpu_hotplug(); |
4340 | if (ret) | |
4341 | goto error_hotplug; | |
101215b7 | 4342 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4343 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4344 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4345 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4346 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4347 | LTTNG_VERSION_NAME, |
4348 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4349 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4350 | #else | |
4351 | "", | |
4352 | #endif | |
4353 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4354 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4355 | #else | |
4356 | ""); | |
4357 | #endif | |
c1551e57 MJ |
4358 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4359 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4360 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4361 | return 0; |
0c956676 | 4362 | |
1e367326 MD |
4363 | error_hotplug: |
4364 | lttng_logger_exit(); | |
0c956676 MD |
4365 | error_logger: |
4366 | lttng_abi_exit(); | |
02119ee5 | 4367 | error_abi: |
a67ba386 MD |
4368 | kmem_cache_destroy(event_notifier_private_cache); |
4369 | error_kmem_event_notifier_private: | |
dffef45d FD |
4370 | kmem_cache_destroy(event_notifier_cache); |
4371 | error_kmem_event_notifier: | |
a67ba386 MD |
4372 | kmem_cache_destroy(event_recorder_private_cache); |
4373 | error_kmem_event_recorder_private: | |
4374 | kmem_cache_destroy(event_recorder_cache); | |
4375 | error_kmem_event_recorder: | |
20591cf7 | 4376 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4377 | error_tp: |
4378 | lttng_context_exit(); | |
101215b7 | 4379 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4380 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4381 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4382 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4383 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4384 | LTTNG_VERSION_NAME, |
4385 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4386 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4387 | #else | |
4388 | "", | |
4389 | #endif | |
4390 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4391 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4392 | #else | |
4393 | ""); | |
4394 | #endif | |
1c25284c | 4395 | return ret; |
4e3c1b9b MD |
4396 | } |
4397 | ||
a90917c3 | 4398 | module_init(lttng_events_init); |
11b5a3c2 | 4399 | |
a90917c3 | 4400 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4401 | { |
8cdc1a81 | 4402 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4403 | |
1e367326 | 4404 | lttng_exit_cpu_hotplug(); |
0c956676 | 4405 | lttng_logger_exit(); |
80996790 | 4406 | lttng_abi_exit(); |
8cdc1a81 MD |
4407 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4408 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4409 | kmem_cache_destroy(event_recorder_cache); |
4410 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4411 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4412 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4413 | lttng_tracepoint_exit(); |
07dfc1d0 | 4414 | lttng_context_exit(); |
101215b7 | 4415 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4416 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4417 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4418 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4419 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4420 | LTTNG_VERSION_NAME, |
4421 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4422 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4423 | #else | |
4424 | "", | |
4425 | #endif | |
4426 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4427 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4428 | #else | |
4429 | ""); | |
4430 | #endif | |
4e3c1b9b | 4431 | } |
92e94819 | 4432 | |
a90917c3 | 4433 | module_exit(lttng_events_exit); |
11b5a3c2 | 4434 | |
7ca11e77 | 4435 | #include <generated/patches.h> |
101215b7 MJ |
4436 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4437 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4438 | #endif | |
4439 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4440 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4441 | #endif | |
92e94819 MD |
4442 | MODULE_LICENSE("GPL and additional rights"); |
4443 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4444 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4445 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4446 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4447 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4448 | LTTNG_MODULES_EXTRAVERSION); |