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 | ||
437d5aa5 | 1948 | int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
8d554755 | 1949 | struct lttng_event_enabler_common *enabler) |
3c997079 | 1950 | { |
4ecb5ad5 | 1951 | const char *desc_name, *enabler_name; |
badfe9f5 | 1952 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1953 | |
1954 | enabler_name = enabler->event_param.name; | |
1955 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 1956 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1957 | desc_name = desc->event_name; |
3b861b22 FD |
1958 | switch (enabler->format_type) { |
1959 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1960 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1961 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1962 | return lttng_match_enabler_name(desc_name, enabler_name); |
1963 | default: | |
1964 | return -EINVAL; | |
1965 | } | |
4ecb5ad5 | 1966 | break; |
b4a75708 | 1967 | |
606828e4 | 1968 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 1969 | desc_name = desc->event_name; |
badfe9f5 | 1970 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1971 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1972 | compat = true; |
1973 | } | |
4ecb5ad5 MD |
1974 | if (!strncmp(desc_name, "syscall_exit_", |
1975 | strlen("syscall_exit_"))) { | |
1976 | desc_name += strlen("syscall_exit_"); | |
1977 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1978 | strlen("syscall_entry_"))) { | |
1979 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1980 | entry = true; |
4ecb5ad5 MD |
1981 | } else { |
1982 | WARN_ON_ONCE(1); | |
1983 | return -EINVAL; | |
1984 | } | |
badfe9f5 | 1985 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 1986 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 1987 | break; |
606828e4 | 1988 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
1989 | if (!entry) |
1990 | return 0; | |
1991 | break; | |
606828e4 | 1992 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
1993 | if (entry) |
1994 | return 0; | |
1995 | break; | |
1996 | default: | |
1997 | return -EINVAL; | |
1998 | } | |
1999 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 2000 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 2001 | break; |
606828e4 | 2002 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
2003 | if (compat) |
2004 | return 0; | |
2005 | break; | |
606828e4 | 2006 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
2007 | if (!compat) |
2008 | return 0; | |
2009 | break; | |
2010 | default: | |
2011 | return -EINVAL; | |
2012 | } | |
2013 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2014 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2015 | switch (enabler->format_type) { |
2016 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2017 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2018 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2019 | return lttng_match_enabler_name(desc_name, enabler_name); |
2020 | default: | |
2021 | return -EINVAL; | |
2022 | } | |
2023 | break; | |
606828e4 | 2024 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2025 | return -EINVAL; /* Not implemented. */ |
2026 | default: | |
2027 | return -EINVAL; | |
2028 | } | |
4ecb5ad5 | 2029 | break; |
b4a75708 | 2030 | |
4ecb5ad5 MD |
2031 | default: |
2032 | WARN_ON_ONCE(1); | |
2033 | return -EINVAL; | |
2034 | } | |
3c997079 MD |
2035 | } |
2036 | ||
2037 | static | |
5c6ec66a MD |
2038 | bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler, |
2039 | struct lttng_kernel_event_common *event) | |
3c997079 | 2040 | { |
5c6ec66a MD |
2041 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
2042 | return false; | |
b2bc0bc8 | 2043 | |
5c6ec66a MD |
2044 | switch (event_enabler->enabler_type) { |
2045 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2046 | { | |
2047 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2048 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2049 | struct lttng_kernel_event_recorder *event_recorder = | |
2050 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2051 | ||
2052 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
2053 | && event_recorder->chan == event_recorder_enabler->chan) | |
2054 | return true; | |
2055 | else | |
2056 | return false; | |
2057 | } | |
2058 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2059 | { | |
2060 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2061 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2062 | struct lttng_kernel_event_notifier *event_notifier = | |
2063 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2064 | ||
2065 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
2066 | && event_notifier->priv->group == event_notifier_enabler->group | |
2067 | && event->priv->user_token == event_enabler->user_token) | |
2068 | return true; | |
2069 | else | |
2070 | return false; | |
2071 | } | |
2072 | default: | |
2073 | WARN_ON_ONCE(1); | |
2074 | return false; | |
2075 | } | |
3c997079 MD |
2076 | } |
2077 | ||
b01155ba | 2078 | static |
5c6ec66a MD |
2079 | bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler, |
2080 | const struct lttng_kernel_event_desc *desc, | |
2081 | struct lttng_kernel_event_common *event) | |
b01155ba | 2082 | { |
5c6ec66a MD |
2083 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
2084 | return false; | |
b01155ba | 2085 | |
5c6ec66a MD |
2086 | switch (event_enabler->enabler_type) { |
2087 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2088 | { | |
2089 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2090 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2091 | struct lttng_kernel_event_recorder *event_recorder = | |
2092 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2093 | ||
2094 | if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan) | |
2095 | return true; | |
2096 | else | |
2097 | return false; | |
2098 | } | |
2099 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2100 | { | |
2101 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2102 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2103 | struct lttng_kernel_event_notifier *event_notifier = | |
2104 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2105 | ||
2106 | if (event->priv->desc == desc | |
2107 | && event_notifier->priv->group == event_notifier_enabler->group | |
2108 | && event->priv->user_token == event_enabler->user_token) | |
2109 | return true; | |
2110 | else | |
2111 | return false; | |
2112 | } | |
2113 | default: | |
2114 | WARN_ON_ONCE(1); | |
2115 | return false; | |
2116 | } | |
b01155ba FD |
2117 | } |
2118 | ||
3c997079 | 2119 | static |
b2bc0bc8 FD |
2120 | struct lttng_enabler_ref *lttng_enabler_ref( |
2121 | struct list_head *enablers_ref_list, | |
8d554755 | 2122 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2123 | { |
2124 | struct lttng_enabler_ref *enabler_ref; | |
2125 | ||
b2bc0bc8 | 2126 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2127 | if (enabler_ref->ref == enabler) |
2128 | return enabler_ref; | |
2129 | } | |
2130 | return NULL; | |
2131 | } | |
2132 | ||
3c997079 | 2133 | static |
1ae083ba | 2134 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_recorder_enabler *event_enabler) |
3c997079 | 2135 | { |
0def9170 | 2136 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent); |
437d5aa5 MD |
2137 | struct lttng_kernel_probe_desc *probe_desc; |
2138 | const struct lttng_kernel_event_desc *desc; | |
3c997079 MD |
2139 | int i; |
2140 | struct list_head *probe_list; | |
2141 | ||
2142 | probe_list = lttng_get_probe_list_head(); | |
2143 | /* | |
2144 | * For each probe event, if we find that a probe event matches | |
2145 | * our enabler, create an associated lttng_event if not | |
2146 | * already present. | |
2147 | */ | |
2148 | list_for_each_entry(probe_desc, probe_list, head) { | |
2149 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2150 | int found = 0; | |
2151 | struct hlist_head *head; | |
83006ee0 | 2152 | struct lttng_kernel_event_common *event; |
19bef247 | 2153 | struct lttng_kernel_event_common_private *event_priv; |
3c997079 MD |
2154 | |
2155 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 | 2156 | if (!lttng_desc_match_enabler(desc, |
1ae083ba | 2157 | lttng_event_recorder_enabler_as_enabler(event_enabler))) |
3c997079 | 2158 | continue; |
3c997079 MD |
2159 | |
2160 | /* | |
2161 | * Check if already created. | |
2162 | */ | |
0def9170 | 2163 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 2164 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
5c6ec66a | 2165 | if (lttng_event_enabler_desc_match_event(&event_enabler->parent, desc, event_priv->pub)) |
3c997079 MD |
2166 | found = 1; |
2167 | } | |
2168 | if (found) | |
2169 | continue; | |
2170 | ||
2171 | /* | |
83006ee0 | 2172 | * We need to create an event for this event probe. |
3c997079 | 2173 | */ |
83006ee0 MD |
2174 | event = _lttng_kernel_event_create(&event_enabler->parent, desc); |
2175 | if (!event) { | |
5a15f70c | 2176 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2177 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2178 | } |
2179 | } | |
2180 | } | |
2181 | } | |
2182 | ||
b01155ba FD |
2183 | static |
2184 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2185 | { | |
0def9170 | 2186 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_notifier_enabler->parent); |
437d5aa5 MD |
2187 | struct lttng_kernel_probe_desc *probe_desc; |
2188 | const struct lttng_kernel_event_desc *desc; | |
b01155ba FD |
2189 | int i; |
2190 | struct list_head *probe_list; | |
2191 | ||
2192 | probe_list = lttng_get_probe_list_head(); | |
2193 | /* | |
2194 | * For each probe event, if we find that a probe event matches | |
2195 | * our enabler, create an associated lttng_event_notifier if not | |
2196 | * already present. | |
2197 | */ | |
2198 | list_for_each_entry(probe_desc, probe_list, head) { | |
2199 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2200 | int found = 0; | |
2201 | struct hlist_head *head; | |
83006ee0 | 2202 | struct lttng_kernel_event_common *event; |
19bef247 | 2203 | struct lttng_kernel_event_common_private *event_priv; |
b01155ba FD |
2204 | |
2205 | desc = probe_desc->event_desc[i]; | |
2206 | if (!lttng_desc_match_enabler(desc, | |
2207 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
2208 | continue; | |
2209 | ||
2210 | /* | |
2211 | * Check if already created. | |
2212 | */ | |
0def9170 | 2213 | head = utils_borrow_hash_table_bucket(events_ht->table, |
33af697f | 2214 | LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 2215 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
5c6ec66a | 2216 | if (lttng_event_enabler_desc_match_event(&event_notifier_enabler->parent, desc, event_priv->pub)) |
b01155ba FD |
2217 | found = 1; |
2218 | } | |
2219 | if (found) | |
2220 | continue; | |
2221 | ||
2222 | /* | |
2223 | * We need to create a event_notifier for this event probe. | |
2224 | */ | |
83006ee0 MD |
2225 | event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc); |
2226 | if (IS_ERR(event)) { | |
b01155ba | 2227 | printk(KERN_INFO "Unable to create event_notifier %s\n", |
437d5aa5 | 2228 | probe_desc->event_desc[i]->event_name); |
b01155ba FD |
2229 | } |
2230 | } | |
2231 | } | |
2232 | } | |
2233 | ||
33a39a3c | 2234 | static |
053554ae | 2235 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c MD |
2236 | { |
2237 | int ret; | |
2238 | ||
053554ae | 2239 | ret = lttng_syscalls_register_event(event_enabler); |
8a8ac9a8 | 2240 | WARN_ON_ONCE(ret); |
8a8ac9a8 FD |
2241 | } |
2242 | ||
33a39a3c | 2243 | /* |
a67ba386 | 2244 | * Create struct lttng_kernel_event_recorder if it is missing and present in the list of |
33a39a3c MD |
2245 | * tracepoint probes. |
2246 | * Should be called with sessions mutex held. | |
2247 | */ | |
2248 | static | |
1ae083ba | 2249 | void lttng_create_event_if_missing(struct lttng_event_recorder_enabler *event_enabler) |
33a39a3c | 2250 | { |
5b9817ae | 2251 | switch (event_enabler->parent.event_param.instrumentation) { |
606828e4 | 2252 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1b917d6b | 2253 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2254 | break; |
b4a75708 | 2255 | |
606828e4 | 2256 | case LTTNG_KERNEL_ABI_SYSCALL: |
053554ae | 2257 | lttng_create_syscall_event_if_missing(&event_enabler->parent); |
33a39a3c | 2258 | break; |
b4a75708 | 2259 | |
33a39a3c MD |
2260 | default: |
2261 | WARN_ON_ONCE(1); | |
2262 | break; | |
2263 | } | |
2264 | } | |
2265 | ||
3c997079 | 2266 | /* |
b2bc0bc8 | 2267 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2268 | * and add backward reference from the event to the enabler. |
2269 | * Should be called with sessions mutex held. | |
2270 | */ | |
2271 | static | |
1ae083ba | 2272 | int lttng_event_enabler_ref_events(struct lttng_event_recorder_enabler *event_enabler) |
3c997079 | 2273 | { |
f7d06400 MD |
2274 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
2275 | struct lttng_kernel_session *session = event_enabler->chan->parent.session; | |
1ae083ba | 2276 | struct lttng_event_enabler_common *base_enabler = lttng_event_recorder_enabler_as_enabler(event_enabler); |
a67ba386 | 2277 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2278 | |
606828e4 MD |
2279 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2280 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2281 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
b2bc0bc8 | 2282 | !strcmp(base_enabler->event_param.name, "*")) { |
3b82c4e1 | 2283 | int enabled = base_enabler->enabled; |
606828e4 | 2284 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
3b82c4e1 | 2285 | |
606828e4 | 2286 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2287 | WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_entry, enabled); |
3b82c4e1 | 2288 | |
606828e4 | 2289 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2290 | WRITE_ONCE(chan->priv->parent.syscall_table.syscall_all_exit, enabled); |
badfe9f5 MD |
2291 | } |
2292 | ||
3c997079 | 2293 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 2294 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2295 | |
b2bc0bc8 | 2296 | /* For each event matching event_enabler in session event list. */ |
8cdc1a81 | 2297 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2298 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 MD |
2299 | struct lttng_enabler_ref *enabler_ref; |
2300 | ||
5c6ec66a | 2301 | if (!lttng_event_enabler_match_event(&event_enabler->parent, &event_recorder->parent)) |
3c997079 | 2302 | continue; |
a67ba386 | 2303 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
1ae083ba | 2304 | lttng_event_recorder_enabler_as_enabler(event_enabler)); |
3c997079 MD |
2305 | if (!enabler_ref) { |
2306 | /* | |
2307 | * If no backward ref, create it. | |
b2bc0bc8 | 2308 | * Add backward ref from event to event_enabler. |
3c997079 MD |
2309 | */ |
2310 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2311 | if (!enabler_ref) | |
2312 | return -ENOMEM; | |
1ae083ba | 2313 | enabler_ref->ref = lttng_event_recorder_enabler_as_enabler(event_enabler); |
3c997079 | 2314 | list_add(&enabler_ref->node, |
a67ba386 | 2315 | &event_recorder_priv->parent.enablers_ref_head); |
3c997079 MD |
2316 | } |
2317 | ||
f127e61e MD |
2318 | /* |
2319 | * Link filter bytecodes if not linked yet. | |
2320 | */ | |
a67ba386 | 2321 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
2dfda770 | 2322 | lttng_static_ctx, |
a67ba386 | 2323 | &event_recorder_priv->parent.filter_bytecode_runtime_head, |
1ae083ba | 2324 | <tng_event_recorder_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
3c997079 MD |
2325 | } |
2326 | return 0; | |
2327 | } | |
2328 | ||
b01155ba | 2329 | /* |
a67ba386 | 2330 | * Create struct lttng_kernel_event_notifier if it is missing and present in the list of |
b01155ba FD |
2331 | * tracepoint probes. |
2332 | * Should be called with sessions mutex held. | |
2333 | */ | |
2334 | static | |
2335 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2336 | { | |
5b9817ae | 2337 | switch (event_notifier_enabler->parent.event_param.instrumentation) { |
606828e4 | 2338 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
b01155ba FD |
2339 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); |
2340 | break; | |
b4a75708 | 2341 | |
606828e4 | 2342 | case LTTNG_KERNEL_ABI_SYSCALL: |
053554ae | 2343 | lttng_create_syscall_event_if_missing(&event_notifier_enabler->parent); |
8a8ac9a8 | 2344 | break; |
b4a75708 | 2345 | |
b01155ba FD |
2346 | default: |
2347 | WARN_ON_ONCE(1); | |
2348 | break; | |
2349 | } | |
2350 | } | |
2351 | ||
2352 | /* | |
2353 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2354 | */ | |
2355 | static | |
8a8ac9a8 FD |
2356 | int lttng_event_notifier_enabler_ref_event_notifiers( |
2357 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
b01155ba FD |
2358 | { |
2359 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
8d554755 | 2360 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
a67ba386 | 2361 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba | 2362 | |
606828e4 MD |
2363 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_ABI_SYSCALL && |
2364 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL && | |
2365 | base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME && | |
8a8ac9a8 FD |
2366 | !strcmp(base_enabler->event_param.name, "*")) { |
2367 | ||
2368 | int enabled = base_enabler->enabled; | |
606828e4 | 2369 | enum lttng_kernel_abi_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit; |
8a8ac9a8 | 2370 | |
606828e4 | 2371 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2372 | WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_entry, enabled); |
8a8ac9a8 | 2373 | |
606828e4 | 2374 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) |
0bb716a8 | 2375 | WRITE_ONCE(event_notifier_group->syscall_table.syscall_all_exit, enabled); |
8a8ac9a8 FD |
2376 | |
2377 | } | |
2378 | ||
b01155ba FD |
2379 | /* First ensure that probe event_notifiers are created for this enabler. */ |
2380 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2381 | ||
2382 | /* Link the created event_notifier with its associated enabler. */ | |
a67ba386 MD |
2383 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2384 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba FD |
2385 | struct lttng_enabler_ref *enabler_ref; |
2386 | ||
5c6ec66a | 2387 | if (!lttng_event_enabler_match_event(&event_notifier_enabler->parent, &event_notifier->parent)) |
b01155ba FD |
2388 | continue; |
2389 | ||
a67ba386 | 2390 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
b01155ba FD |
2391 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
2392 | if (!enabler_ref) { | |
2393 | /* | |
2394 | * If no backward ref, create it. | |
2395 | * Add backward ref from event_notifier to enabler. | |
2396 | */ | |
2397 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2398 | if (!enabler_ref) | |
2399 | return -ENOMEM; | |
2400 | ||
2401 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2402 | event_notifier_enabler); | |
2403 | list_add(&enabler_ref->node, | |
a67ba386 | 2404 | &event_notifier_priv->parent.enablers_ref_head); |
b01155ba FD |
2405 | } |
2406 | ||
2407 | /* | |
2408 | * Link filter bytecodes if not linked yet. | |
2409 | */ | |
a67ba386 MD |
2410 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2411 | lttng_static_ctx, &event_notifier_priv->parent.filter_bytecode_runtime_head, | |
60206944 | 2412 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
99d223ad FD |
2413 | |
2414 | /* Link capture bytecodes if not linked yet. */ | |
a67ba386 MD |
2415 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
2416 | lttng_static_ctx, &event_notifier_priv->capture_bytecode_runtime_head, | |
99d223ad FD |
2417 | &event_notifier_enabler->capture_bytecode_head); |
2418 | ||
a67ba386 | 2419 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
b01155ba FD |
2420 | } |
2421 | return 0; | |
2422 | } | |
2423 | ||
3c997079 MD |
2424 | /* |
2425 | * Called at module load: connect the probe on all enablers matching | |
2426 | * this event. | |
2427 | * Called with sessions lock held. | |
2428 | */ | |
2429 | int lttng_fix_pending_events(void) | |
2430 | { | |
8cdc1a81 | 2431 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2432 | |
8cdc1a81 MD |
2433 | list_for_each_entry(session_priv, &sessions, list) |
2434 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2435 | return 0; |
2436 | } | |
2437 | ||
b01155ba FD |
2438 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2439 | struct lttng_event_notifier_group *event_notifier_group) | |
2440 | { | |
2441 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2442 | ||
2443 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2444 | node) { | |
5b9817ae | 2445 | if (event_notifier_enabler->parent.enabled) |
b01155ba FD |
2446 | return true; |
2447 | } | |
2448 | return false; | |
2449 | } | |
2450 | ||
2451 | bool lttng_event_notifier_active(void) | |
2452 | { | |
2453 | struct lttng_event_notifier_group *event_notifier_group; | |
2454 | ||
2455 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2456 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2457 | return true; | |
2458 | } | |
2459 | return false; | |
2460 | } | |
2461 | ||
2462 | int lttng_fix_pending_event_notifiers(void) | |
2463 | { | |
2464 | struct lttng_event_notifier_group *event_notifier_group; | |
2465 | ||
2466 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2467 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2468 | return 0; | |
2469 | } | |
2470 | ||
1ae083ba | 2471 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2472 | enum lttng_enabler_format_type format_type, |
606828e4 | 2473 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2474 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2475 | { |
1ae083ba | 2476 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2477 | |
b2bc0bc8 FD |
2478 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2479 | if (!event_enabler) | |
3c997079 | 2480 | return NULL; |
0bb716a8 | 2481 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2482 | event_enabler->parent.format_type = format_type; |
2483 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2484 | memcpy(&event_enabler->parent.event_param, event_param, | |
2485 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2486 | event_enabler->chan = chan; |
3c997079 | 2487 | /* ctx left NULL */ |
5b9817ae | 2488 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2489 | return event_enabler; |
2490 | } | |
2491 | ||
2492 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2493 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2494 | { |
3c997079 | 2495 | mutex_lock(&sessions_mutex); |
def1e304 MD |
2496 | list_add(&event_enabler->node, &session->priv->enablers_head); |
2497 | event_enabler->published = true; | |
2498 | lttng_session_lazy_sync_event_enablers(session); | |
3c997079 | 2499 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2500 | } |
2501 | ||
7b25ab0e | 2502 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2503 | { |
2504 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2505 | event_enabler->enabled = 1; |
2506 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2507 | mutex_unlock(&sessions_mutex); |
2508 | return 0; | |
2509 | } | |
2510 | ||
7b25ab0e | 2511 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2512 | { |
2513 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2514 | event_enabler->enabled = 0; |
2515 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2516 | mutex_unlock(&sessions_mutex); |
2517 | return 0; | |
2518 | } | |
2519 | ||
b2bc0bc8 | 2520 | static |
8d554755 | 2521 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2522 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2523 | { |
d64ca521 | 2524 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2525 | uint32_t bytecode_len; |
2526 | int ret; | |
2527 | ||
2528 | ret = get_user(bytecode_len, &bytecode->len); | |
2529 | if (ret) | |
2530 | return ret; | |
52cfcdf3 | 2531 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2532 | GFP_KERNEL); |
2533 | if (!bytecode_node) | |
2534 | return -ENOMEM; | |
2535 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2536 | sizeof(*bytecode) + bytecode_len); | |
2537 | if (ret) | |
2538 | goto error_free; | |
b2bc0bc8 | 2539 | |
8a445457 | 2540 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2541 | bytecode_node->enabler = enabler; |
2542 | /* Enforce length based on allocated size */ | |
2543 | bytecode_node->bc.len = bytecode_len; | |
2544 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2545 | |
07dfc1d0 MD |
2546 | return 0; |
2547 | ||
2548 | error_free: | |
52cfcdf3 | 2549 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2550 | return ret; |
2551 | } | |
2552 | ||
6048044f | 2553 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2554 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2555 | { |
2556 | int ret; | |
6048044f | 2557 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2558 | if (ret) |
2559 | goto error; | |
7b25ab0e | 2560 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2561 | return 0; |
2562 | ||
2563 | error: | |
2564 | return ret; | |
2565 | } | |
2566 | ||
e2d5dbc7 | 2567 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2568 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2569 | { |
2570 | ||
e2d5dbc7 | 2571 | switch (event->priv->instrumentation) { |
606828e4 | 2572 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2573 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2574 | default: |
2575 | return -EINVAL; | |
2576 | } | |
2577 | } | |
2578 | ||
3c997079 | 2579 | static |
8d554755 | 2580 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2581 | { |
d64ca521 | 2582 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2583 | |
2584 | /* Destroy filter bytecode */ | |
2585 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2586 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2587 | lttng_kvfree(filter_node); |
07dfc1d0 | 2588 | } |
b2bc0bc8 FD |
2589 | } |
2590 | ||
44b1abdc | 2591 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2592 | { |
44b1abdc MD |
2593 | switch (event_enabler->enabler_type) { |
2594 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2595 | { | |
2596 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2597 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2598 | ||
2599 | lttng_enabler_destroy(event_enabler); | |
2600 | if (event_recorder_enabler->published) | |
2601 | list_del(&event_recorder_enabler->node); | |
2602 | kfree(event_recorder_enabler); | |
2603 | break; | |
2604 | } | |
2605 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2606 | { | |
2607 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2608 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2609 | |
44b1abdc | 2610 | lttng_enabler_destroy(event_enabler); |
1bbb5b2d MD |
2611 | if (event_notifier_enabler->published) |
2612 | list_del(&event_notifier_enabler->node); | |
44b1abdc MD |
2613 | kfree(event_notifier_enabler); |
2614 | break; | |
2615 | } | |
2616 | default: | |
2617 | WARN_ON_ONCE(1); | |
2618 | } | |
3c997079 MD |
2619 | } |
2620 | ||
dffef45d | 2621 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
dffef45d | 2622 | enum lttng_enabler_format_type format_type, |
1bbb5b2d MD |
2623 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
2624 | struct lttng_event_notifier_group *event_notifier_group) | |
dffef45d FD |
2625 | { |
2626 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2627 | ||
2628 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2629 | if (!event_notifier_enabler) | |
2630 | return NULL; | |
2631 | ||
0bb716a8 | 2632 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2633 | event_notifier_enabler->parent.format_type = format_type; |
2634 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2635 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2636 | ||
99f52fcc | 2637 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2638 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2639 | |
5b9817ae MD |
2640 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2641 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2642 | |
5b9817ae MD |
2643 | event_notifier_enabler->parent.enabled = 0; |
2644 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d | 2645 | event_notifier_enabler->group = event_notifier_group; |
1bbb5b2d MD |
2646 | return event_notifier_enabler; |
2647 | } | |
dffef45d | 2648 | |
1bbb5b2d MD |
2649 | void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group, |
2650 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2651 | { | |
dffef45d FD |
2652 | mutex_lock(&sessions_mutex); |
2653 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
1bbb5b2d | 2654 | event_notifier_enabler->published = true; |
b01155ba | 2655 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d | 2656 | mutex_unlock(&sessions_mutex); |
dffef45d FD |
2657 | } |
2658 | ||
2659 | int lttng_event_notifier_enabler_enable( | |
2660 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2661 | { | |
2662 | mutex_lock(&sessions_mutex); | |
2663 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2664 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2665 | mutex_unlock(&sessions_mutex); |
2666 | return 0; | |
2667 | } | |
2668 | ||
2669 | int lttng_event_notifier_enabler_disable( | |
2670 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2671 | { | |
2672 | mutex_lock(&sessions_mutex); | |
2673 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2674 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2675 | mutex_unlock(&sessions_mutex); |
2676 | return 0; | |
2677 | } | |
2678 | ||
99d223ad FD |
2679 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2680 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2681 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2682 | { |
d64ca521 | 2683 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2684 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2685 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2686 | uint32_t bytecode_len; | |
2687 | int ret; | |
2688 | ||
2689 | ret = get_user(bytecode_len, &bytecode->len); | |
2690 | if (ret) | |
2691 | return ret; | |
2692 | ||
2693 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2694 | GFP_KERNEL); | |
2695 | if (!bytecode_node) | |
2696 | return -ENOMEM; | |
2697 | ||
2698 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2699 | sizeof(*bytecode) + bytecode_len); | |
2700 | if (ret) | |
2701 | goto error_free; | |
2702 | ||
8a445457 | 2703 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2704 | bytecode_node->enabler = enabler; |
2705 | ||
2706 | /* Enforce length based on allocated size */ | |
2707 | bytecode_node->bc.len = bytecode_len; | |
2708 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2709 | ||
2710 | event_notifier_enabler->num_captures++; | |
2711 | ||
2712 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2713 | goto end; | |
2714 | ||
2715 | error_free: | |
2716 | lttng_kvfree(bytecode_node); | |
2717 | end: | |
2718 | return ret; | |
2719 | } | |
2720 | ||
3c997079 | 2721 | /* |
b2bc0bc8 | 2722 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2723 | * session. |
2724 | * Should be called with sessions mutex held. | |
2725 | */ | |
2726 | static | |
8cdc1a81 | 2727 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 | 2728 | { |
1ae083ba | 2729 | struct lttng_event_recorder_enabler *event_enabler; |
a67ba386 | 2730 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
3c997079 | 2731 | |
8cdc1a81 | 2732 | list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
b2bc0bc8 | 2733 | lttng_event_enabler_ref_events(event_enabler); |
3c997079 MD |
2734 | /* |
2735 | * For each event, if at least one of its enablers is enabled, | |
2736 | * and its channel and session transient states are enabled, we | |
2737 | * enable the event, else we disable it. | |
2738 | */ | |
8cdc1a81 | 2739 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 | 2740 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; |
3c997079 | 2741 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2742 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2743 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2744 | int nr_filters = 0; | |
3c997079 | 2745 | |
a67ba386 | 2746 | switch (event_recorder_priv->parent.instrumentation) { |
c190d76e MJ |
2747 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2748 | lttng_fallthrough; | |
606828e4 | 2749 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
2750 | /* Enable events */ |
2751 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2752 | &event_recorder_priv->parent.enablers_ref_head, node) { |
3c997079 MD |
2753 | if (enabler_ref->ref->enabled) { |
2754 | enabled = 1; | |
2755 | break; | |
2756 | } | |
2757 | } | |
4ecb5ad5 | 2758 | break; |
b4a75708 | 2759 | |
4ecb5ad5 | 2760 | default: |
3c997079 MD |
2761 | /* Not handled with lazy sync. */ |
2762 | continue; | |
2763 | } | |
2764 | /* | |
2765 | * Enabled state is based on union of enablers, with | |
2766 | * intesection of session and channel transient enable | |
2767 | * states. | |
2768 | */ | |
f7d06400 | 2769 | enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; |
3c997079 | 2770 | |
a67ba386 | 2771 | WRITE_ONCE(event_recorder->parent.enabled, enabled); |
3c997079 MD |
2772 | /* |
2773 | * Sync tracepoint registration with event enabled | |
2774 | * state. | |
2775 | */ | |
2776 | if (enabled) { | |
0c851fa0 | 2777 | register_event(&event_recorder->parent); |
3c997079 | 2778 | } else { |
f0bcc14c | 2779 | _lttng_event_unregister(&event_recorder->parent); |
3c997079 | 2780 | } |
07dfc1d0 MD |
2781 | |
2782 | /* Check if has enablers without bytecode enabled */ | |
2783 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2784 | &event_recorder_priv->parent.enablers_ref_head, node) { |
07dfc1d0 MD |
2785 | if (enabler_ref->ref->enabled |
2786 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2787 | has_enablers_without_filter_bytecode = 1; |
07dfc1d0 MD |
2788 | break; |
2789 | } | |
2790 | } | |
a67ba386 | 2791 | event_recorder_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2792 | has_enablers_without_filter_bytecode; |
07dfc1d0 MD |
2793 | |
2794 | /* Enable filters */ | |
2795 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2796 | &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2797 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2798 | nr_filters++; |
2799 | } | |
2800 | WRITE_ONCE(event_recorder_priv->parent.pub->eval_filter, | |
2801 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
3c997079 MD |
2802 | } |
2803 | } | |
2804 | ||
2805 | /* | |
2806 | * Apply enablers to session events, adding events to session if need | |
2807 | * be. It is required after each modification applied to an active | |
2808 | * session, and right before session "start". | |
2809 | * "lazy" sync means we only sync if required. | |
2810 | * Should be called with sessions mutex held. | |
2811 | */ | |
2812 | static | |
8cdc1a81 | 2813 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2814 | { |
2815 | /* We can skip if session is not active */ | |
2816 | if (!session->active) | |
2817 | return; | |
b2bc0bc8 | 2818 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2819 | } |
2820 | ||
b01155ba FD |
2821 | static |
2822 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2823 | { | |
2824 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
a67ba386 | 2825 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
b01155ba FD |
2826 | |
2827 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2828 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2829 | ||
2830 | /* | |
2831 | * For each event_notifier, if at least one of its enablers is enabled, | |
2832 | * we enable the event_notifier, else we disable it. | |
2833 | */ | |
a67ba386 MD |
2834 | list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
2835 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
b01155ba | 2836 | struct lttng_enabler_ref *enabler_ref; |
218585b9 | 2837 | struct lttng_kernel_bytecode_runtime *runtime; |
e2d5dbc7 MD |
2838 | int enabled = 0, has_enablers_without_filter_bytecode = 0; |
2839 | int nr_filters = 0, nr_captures = 0; | |
b01155ba | 2840 | |
a67ba386 | 2841 | switch (event_notifier_priv->parent.instrumentation) { |
c190d76e MJ |
2842 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2843 | lttng_fallthrough; | |
606828e4 | 2844 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
2845 | /* Enable event_notifiers */ |
2846 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2847 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2848 | if (enabler_ref->ref->enabled) { |
2849 | enabled = 1; | |
2850 | break; | |
2851 | } | |
2852 | } | |
2853 | break; | |
b4a75708 | 2854 | |
b01155ba FD |
2855 | default: |
2856 | /* Not handled with sync. */ | |
2857 | continue; | |
2858 | } | |
2859 | ||
a67ba386 | 2860 | WRITE_ONCE(event_notifier->parent.enabled, enabled); |
b01155ba FD |
2861 | /* |
2862 | * Sync tracepoint registration with event_notifier enabled | |
2863 | * state. | |
2864 | */ | |
2865 | if (enabled) { | |
a67ba386 | 2866 | if (!event_notifier_priv->parent.registered) |
0c851fa0 | 2867 | register_event(&event_notifier->parent); |
b01155ba | 2868 | } else { |
a67ba386 | 2869 | if (event_notifier_priv->parent.registered) |
f0bcc14c | 2870 | _lttng_event_unregister(&event_notifier->parent); |
b01155ba FD |
2871 | } |
2872 | ||
2873 | /* Check if has enablers without bytecode enabled */ | |
2874 | list_for_each_entry(enabler_ref, | |
a67ba386 | 2875 | &event_notifier_priv->parent.enablers_ref_head, node) { |
b01155ba FD |
2876 | if (enabler_ref->ref->enabled |
2877 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
e2d5dbc7 | 2878 | has_enablers_without_filter_bytecode = 1; |
b01155ba FD |
2879 | break; |
2880 | } | |
2881 | } | |
a67ba386 | 2882 | event_notifier_priv->parent.has_enablers_without_filter_bytecode = |
e2d5dbc7 | 2883 | has_enablers_without_filter_bytecode; |
b01155ba FD |
2884 | |
2885 | /* Enable filters */ | |
2886 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2887 | &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { |
8a445457 | 2888 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2889 | nr_filters++; |
2890 | } | |
2891 | WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter, | |
2892 | !(has_enablers_without_filter_bytecode || !nr_filters)); | |
99d223ad FD |
2893 | |
2894 | /* Enable captures */ | |
2895 | list_for_each_entry(runtime, | |
e2d5dbc7 | 2896 | &event_notifier_priv->capture_bytecode_runtime_head, node) { |
8a445457 | 2897 | lttng_bytecode_sync_state(runtime); |
e2d5dbc7 MD |
2898 | nr_captures++; |
2899 | } | |
2900 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
b01155ba FD |
2901 | } |
2902 | } | |
2903 | ||
7b25ab0e MD |
2904 | static |
2905 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2906 | { | |
2907 | switch (event_enabler->enabler_type) { | |
2908 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2909 | { | |
2910 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2911 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2912 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2913 | break; | |
2914 | } | |
2915 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2916 | { | |
2917 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2918 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2919 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2920 | break; | |
2921 | } | |
2922 | default: | |
2923 | WARN_ON_ONCE(1); | |
2924 | } | |
2925 | } | |
2926 | ||
1ec3f75a | 2927 | /* |
d83004aa JD |
2928 | * Serialize at most one packet worth of metadata into a metadata |
2929 | * channel. | |
92d9f5e6 MD |
2930 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2931 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2932 | * allows us to do racy operations such as looking for remaining space left in | |
2933 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2934 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2935 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2936 | * Returns the number of bytes written in the channel, 0 if no data |
2937 | * was written and a negative value on error. | |
1ec3f75a | 2938 | */ |
b3b8072b | 2939 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2940 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2941 | { |
8a57ec02 | 2942 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2943 | int ret = 0; |
2944 | size_t len, reserve_len; | |
2945 | ||
f613e3e6 | 2946 | /* |
92d9f5e6 MD |
2947 | * Ensure we support mutiple get_next / put sequences followed by |
2948 | * put_next. The metadata cache lock protects reading the metadata | |
2949 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2950 | * "flush" operations on the buffer invoked by different processes. | |
2951 | * Moreover, since the metadata cache memory can be reallocated, we | |
2952 | * need to have exclusive access against updates even though we only | |
2953 | * read it. | |
f613e3e6 | 2954 | */ |
92d9f5e6 | 2955 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2956 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2957 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2958 | goto end; |
f613e3e6 | 2959 | |
9616f0bf JD |
2960 | /* Metadata regenerated, change the version. */ |
2961 | if (stream->metadata_cache->version != stream->version) | |
2962 | stream->version = stream->metadata_cache->version; | |
2963 | ||
d83004aa | 2964 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2965 | stream->metadata_in; |
9de2c215 | 2966 | if (!len) |
de23d59d | 2967 | goto end; |
d83004aa | 2968 | reserve_len = min_t(size_t, |
4a399b76 | 2969 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2970 | len); |
a775608d | 2971 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2972 | sizeof(char), NULL); |
d83004aa JD |
2973 | /* |
2974 | * If reservation failed, return an error to the caller. | |
2975 | */ | |
c2fb9c1c | 2976 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2977 | if (ret != 0) { |
2978 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2979 | stream->coherent = false; |
d83004aa JD |
2980 | goto end; |
2981 | } | |
b3b8072b | 2982 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2983 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2984 | reserve_len, 1); |
b3b8072b | 2985 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2986 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2987 | if (reserve_len < len) |
8b97fd42 MD |
2988 | stream->coherent = false; |
2989 | else | |
2990 | stream->coherent = true; | |
d83004aa JD |
2991 | ret = reserve_len; |
2992 | ||
2993 | end: | |
8b97fd42 MD |
2994 | if (coherent) |
2995 | *coherent = stream->coherent; | |
92d9f5e6 | 2996 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2997 | return ret; |
2998 | } | |
2999 | ||
8b97fd42 | 3000 | static |
8cdc1a81 | 3001 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 3002 | { |
8cdc1a81 MD |
3003 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
3004 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
3005 | } |
3006 | ||
3007 | static | |
8cdc1a81 | 3008 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 3009 | { |
8cdc1a81 MD |
3010 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3011 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
3012 | struct lttng_metadata_stream *stream; |
3013 | ||
8cdc1a81 | 3014 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 3015 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 3016 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 3017 | } |
8b97fd42 MD |
3018 | } |
3019 | ||
d83004aa JD |
3020 | /* |
3021 | * Write the metadata to the metadata cache. | |
3022 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
3023 | * The metadata cache lock protects us from concurrent read access from |
3024 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
3025 | * The content of the printf is printed as a single atomic metadata |
3026 | * transaction. | |
d83004aa | 3027 | */ |
8cdc1a81 | 3028 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
3029 | const char *fmt, ...) |
3030 | { | |
c099397a | 3031 | char *str; |
d83004aa | 3032 | size_t len; |
c099397a MD |
3033 | va_list ap; |
3034 | ||
585e5dcc | 3035 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
3036 | |
3037 | va_start(ap, fmt); | |
3038 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
3039 | va_end(ap); | |
3040 | if (!str) | |
3041 | return -ENOMEM; | |
3042 | ||
1ec3f75a | 3043 | len = strlen(str); |
8cdc1a81 MD |
3044 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3045 | if (session->priv->metadata_cache->metadata_written + len > | |
3046 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
3047 | char *tmp_cache_realloc; |
3048 | unsigned int tmp_cache_alloc_size; | |
3049 | ||
3050 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
3051 | session->priv->metadata_cache->cache_alloc + len, |
3052 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 3053 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
3054 | if (!tmp_cache_realloc) |
3055 | goto err; | |
8cdc1a81 | 3056 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 3057 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
3058 | session->priv->metadata_cache->data, |
3059 | session->priv->metadata_cache->cache_alloc); | |
3060 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
3061 | } |
3062 | ||
8cdc1a81 MD |
3063 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3064 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3065 | } |
8cdc1a81 MD |
3066 | memcpy(session->priv->metadata_cache->data + |
3067 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3068 | str, len); |
8cdc1a81 | 3069 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3070 | kfree(str); |
d83004aa | 3071 | |
d83004aa JD |
3072 | return 0; |
3073 | ||
3074 | err: | |
3075 | kfree(str); | |
3076 | return -ENOMEM; | |
c099397a MD |
3077 | } |
3078 | ||
f513b2bf | 3079 | static |
8cdc1a81 | 3080 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3081 | { |
3082 | size_t i; | |
3083 | ||
3084 | for (i = 0; i < nesting; i++) { | |
3085 | int ret; | |
3086 | ||
3087 | ret = lttng_metadata_printf(session, " "); | |
3088 | if (ret) { | |
3089 | return ret; | |
3090 | } | |
3091 | } | |
3092 | return 0; | |
3093 | } | |
3094 | ||
ceabb767 | 3095 | static |
8cdc1a81 | 3096 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3097 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3098 | size_t nesting) |
3099 | { | |
3100 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3101 | } | |
3102 | ||
3103 | static | |
8cdc1a81 | 3104 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3105 | const struct lttng_kernel_type_integer *type, |
3106 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3107 | size_t nesting) |
3108 | { | |
3109 | int ret; | |
3110 | ||
ceabb767 MD |
3111 | ret = print_tabs(session, nesting); |
3112 | if (ret) | |
3113 | return ret; | |
3114 | ret = lttng_metadata_printf(session, | |
3115 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3116 | type->size, |
3117 | type->alignment, | |
3118 | type->signedness, | |
3119 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3120 | ? "none" |
437d5aa5 | 3121 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3122 | ? "UTF8" |
3123 | : "ASCII", | |
437d5aa5 | 3124 | type->base, |
ceabb767 | 3125 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3126 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3127 | #else |
437d5aa5 | 3128 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3129 | #endif |
3130 | ); | |
3131 | return ret; | |
3132 | } | |
3133 | ||
f513b2bf MD |
3134 | /* |
3135 | * Must be called with sessions_mutex held. | |
3136 | */ | |
3137 | static | |
8cdc1a81 | 3138 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3139 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3140 | size_t nesting) |
3141 | { | |
51ef4536 | 3142 | const char *prev_field_name = NULL; |
f513b2bf MD |
3143 | int ret; |
3144 | uint32_t i, nr_fields; | |
ceabb767 MD |
3145 | unsigned int alignment; |
3146 | ||
f513b2bf MD |
3147 | ret = print_tabs(session, nesting); |
3148 | if (ret) | |
3149 | return ret; | |
3150 | ret = lttng_metadata_printf(session, | |
3151 | "struct {\n"); | |
3152 | if (ret) | |
3153 | return ret; | |
437d5aa5 | 3154 | nr_fields = type->nr_fields; |
f513b2bf | 3155 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3156 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3157 | |
437d5aa5 | 3158 | iter_field = type->fields[i]; |
51ef4536 | 3159 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3160 | if (ret) |
3161 | return ret; | |
3162 | } | |
3163 | ret = print_tabs(session, nesting); | |
3164 | if (ret) | |
3165 | return ret; | |
437d5aa5 | 3166 | alignment = type->alignment; |
ceabb767 MD |
3167 | if (alignment) { |
3168 | ret = lttng_metadata_printf(session, | |
3169 | "} align(%u)", | |
3170 | alignment); | |
3171 | } else { | |
3172 | ret = lttng_metadata_printf(session, | |
3173 | "}"); | |
3174 | } | |
f513b2bf MD |
3175 | return ret; |
3176 | } | |
3177 | ||
3178 | /* | |
3179 | * Must be called with sessions_mutex held. | |
3180 | */ | |
3181 | static | |
8cdc1a81 | 3182 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3183 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3184 | size_t nesting) |
3185 | { | |
3186 | int ret; | |
3187 | ||
3188 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3189 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3190 | if (ret) |
3191 | return ret; | |
ceabb767 | 3192 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3193 | } |
3194 | ||
65c85aa6 MD |
3195 | /* |
3196 | * Must be called with sessions_mutex held. | |
3197 | */ | |
3198 | static | |
8cdc1a81 | 3199 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3200 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3201 | size_t nesting, |
3202 | const char *prev_field_name) | |
65c85aa6 | 3203 | { |
51ef4536 | 3204 | const char *tag_name; |
65c85aa6 MD |
3205 | int ret; |
3206 | uint32_t i, nr_choices; | |
3207 | ||
51ef4536 MD |
3208 | tag_name = type->tag_name; |
3209 | if (!tag_name) | |
3210 | tag_name = prev_field_name; | |
3211 | if (!tag_name) | |
3212 | return -EINVAL; | |
ceabb767 MD |
3213 | /* |
3214 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3215 | */ | |
437d5aa5 | 3216 | if (type->alignment != 0) |
ceabb767 | 3217 | return -EINVAL; |
65c85aa6 MD |
3218 | ret = print_tabs(session, nesting); |
3219 | if (ret) | |
3220 | return ret; | |
3221 | ret = lttng_metadata_printf(session, | |
3222 | "variant <_%s> {\n", | |
51ef4536 | 3223 | tag_name); |
65c85aa6 MD |
3224 | if (ret) |
3225 | return ret; | |
437d5aa5 | 3226 | nr_choices = type->nr_choices; |
65c85aa6 | 3227 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3228 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3229 | |
437d5aa5 | 3230 | iter_field = type->choices[i]; |
51ef4536 | 3231 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3232 | if (ret) |
3233 | return ret; | |
3234 | } | |
3235 | ret = print_tabs(session, nesting); | |
3236 | if (ret) | |
3237 | return ret; | |
3238 | ret = lttng_metadata_printf(session, | |
3239 | "}"); | |
3240 | return ret; | |
3241 | } | |
3242 | ||
3243 | /* | |
3244 | * Must be called with sessions_mutex held. | |
3245 | */ | |
3246 | static | |
8cdc1a81 | 3247 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3248 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3249 | size_t nesting, |
3250 | const char *prev_field_name) | |
65c85aa6 MD |
3251 | { |
3252 | int ret; | |
3253 | ||
3254 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3255 | lttng_kernel_get_type_variant(field->type), nesting, |
3256 | prev_field_name); | |
65c85aa6 MD |
3257 | if (ret) |
3258 | return ret; | |
ceabb767 | 3259 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3260 | } |
3261 | ||
f513b2bf MD |
3262 | /* |
3263 | * Must be called with sessions_mutex held. | |
3264 | */ | |
3265 | static | |
8cdc1a81 | 3266 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3267 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3268 | size_t nesting) |
3269 | { | |
3270 | int ret; | |
437d5aa5 MD |
3271 | const struct lttng_kernel_type_array *array_type; |
3272 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3273 | |
437d5aa5 MD |
3274 | array_type = lttng_kernel_get_type_array(field->type); |
3275 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3276 | |
437d5aa5 | 3277 | if (array_type->alignment) { |
ceabb767 | 3278 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3279 | if (ret) |
3280 | return ret; | |
ceabb767 MD |
3281 | ret = lttng_metadata_printf(session, |
3282 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3283 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3284 | field->name); |
3285 | if (ret) | |
3286 | return ret; | |
3287 | } | |
3288 | /* | |
3289 | * Nested compound types: Only array of structures and variants are | |
3290 | * currently supported. | |
3291 | */ | |
437d5aa5 | 3292 | elem_type = array_type->elem_type; |
12bb2edb MD |
3293 | switch (elem_type->type) { |
3294 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3295 | case lttng_kernel_type_struct: |
3296 | case lttng_kernel_type_variant: | |
3297 | ret = _lttng_type_statedump(session, elem_type, | |
3298 | array_type->encoding, nesting); | |
65c85aa6 MD |
3299 | if (ret) |
3300 | return ret; | |
3301 | break; | |
ceabb767 | 3302 | |
f513b2bf MD |
3303 | default: |
3304 | return -EINVAL; | |
3305 | } | |
3306 | ret = lttng_metadata_printf(session, | |
3307 | " _%s[%u];\n", | |
3308 | field->name, | |
437d5aa5 | 3309 | array_type->length); |
f513b2bf MD |
3310 | return ret; |
3311 | } | |
3312 | ||
3313 | /* | |
3314 | * Must be called with sessions_mutex held. | |
3315 | */ | |
3316 | static | |
8cdc1a81 | 3317 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3318 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3319 | size_t nesting, |
3320 | const char *prev_field_name) | |
f513b2bf MD |
3321 | { |
3322 | int ret; | |
3323 | const char *length_name; | |
437d5aa5 MD |
3324 | const struct lttng_kernel_type_sequence *sequence_type; |
3325 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3326 | |
437d5aa5 MD |
3327 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3328 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3329 | |
437d5aa5 | 3330 | length_name = sequence_type->length_name; |
51ef4536 MD |
3331 | if (!length_name) |
3332 | length_name = prev_field_name; | |
3333 | if (!length_name) | |
3334 | return -EINVAL; | |
ceabb767 | 3335 | |
437d5aa5 | 3336 | if (sequence_type->alignment) { |
ceabb767 | 3337 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3338 | if (ret) |
3339 | return ret; | |
ceabb767 MD |
3340 | ret = lttng_metadata_printf(session, |
3341 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3342 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3343 | field->name); |
3344 | if (ret) | |
3345 | return ret; | |
3346 | } | |
3347 | ||
3348 | /* | |
3349 | * Nested compound types: Only array of structures and variants are | |
3350 | * currently supported. | |
3351 | */ | |
437d5aa5 | 3352 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3353 | switch (elem_type->type) { |
3354 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3355 | case lttng_kernel_type_struct: |
3356 | case lttng_kernel_type_variant: | |
3357 | ret = _lttng_type_statedump(session, elem_type, | |
3358 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3359 | if (ret) |
3360 | return ret; | |
3361 | break; | |
ceabb767 | 3362 | |
f513b2bf MD |
3363 | default: |
3364 | return -EINVAL; | |
3365 | } | |
3366 | ret = lttng_metadata_printf(session, | |
3367 | " _%s[ _%s ];\n", | |
3368 | field->name, | |
51ef4536 | 3369 | length_name); |
f513b2bf MD |
3370 | return ret; |
3371 | } | |
3372 | ||
141ddf28 MD |
3373 | /* |
3374 | * Must be called with sessions_mutex held. | |
3375 | */ | |
3376 | static | |
8cdc1a81 | 3377 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3378 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3379 | size_t nesting) |
3380 | { | |
d96a4a7a | 3381 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3382 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3383 | int ret; |
3384 | unsigned int i, nr_entries; | |
3385 | ||
437d5aa5 | 3386 | container_type = type->container_type; |
12bb2edb | 3387 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3388 | ret = -EINVAL; |
3389 | goto end; | |
3390 | } | |
437d5aa5 | 3391 | enum_desc = type->desc; |
141ddf28 MD |
3392 | nr_entries = enum_desc->nr_entries; |
3393 | ||
3394 | ret = print_tabs(session, nesting); | |
3395 | if (ret) | |
3396 | goto end; | |
ceabb767 MD |
3397 | ret = lttng_metadata_printf(session, "enum : "); |
3398 | if (ret) | |
3399 | goto end; | |
437d5aa5 MD |
3400 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3401 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3402 | if (ret) |
ceabb767 MD |
3403 | goto end; |
3404 | ret = lttng_metadata_printf(session, " {\n"); | |
3405 | if (ret) | |
3406 | goto end; | |
141ddf28 MD |
3407 | /* Dump all entries */ |
3408 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3409 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3410 | int j, len; |
3411 | ||
3412 | ret = print_tabs(session, nesting + 1); | |
3413 | if (ret) | |
3414 | goto end; | |
3415 | ret = lttng_metadata_printf(session, | |
3416 | "\""); | |
3417 | if (ret) | |
3418 | goto end; | |
3419 | len = strlen(entry->string); | |
3420 | /* Escape the character '"' */ | |
3421 | for (j = 0; j < len; j++) { | |
3422 | char c = entry->string[j]; | |
3423 | ||
3424 | switch (c) { | |
3425 | case '"': | |
3426 | ret = lttng_metadata_printf(session, | |
3427 | "\\\""); | |
3428 | break; | |
3429 | case '\\': | |
3430 | ret = lttng_metadata_printf(session, | |
3431 | "\\\\"); | |
3432 | break; | |
3433 | default: | |
3434 | ret = lttng_metadata_printf(session, | |
3435 | "%c", c); | |
3436 | break; | |
3437 | } | |
3438 | if (ret) | |
3439 | goto end; | |
3440 | } | |
08ad1061 PP |
3441 | ret = lttng_metadata_printf(session, "\""); |
3442 | if (ret) | |
3443 | goto end; | |
3444 | ||
3445 | if (entry->options.is_auto) { | |
3446 | ret = lttng_metadata_printf(session, ",\n"); | |
3447 | if (ret) | |
3448 | goto end; | |
141ddf28 | 3449 | } else { |
7c559490 MD |
3450 | ret = lttng_metadata_printf(session, |
3451 | " = "); | |
3452 | if (ret) | |
3453 | goto end; | |
3454 | if (entry->start.signedness) | |
141ddf28 | 3455 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3456 | "%lld", (long long) entry->start.value); |
3457 | else | |
3458 | ret = lttng_metadata_printf(session, | |
3459 | "%llu", entry->start.value); | |
3460 | if (ret) | |
3461 | goto end; | |
3462 | if (entry->start.signedness == entry->end.signedness && | |
3463 | entry->start.value | |
3464 | == entry->end.value) { | |
141ddf28 | 3465 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3466 | ",\n"); |
3467 | } else { | |
3468 | if (entry->end.signedness) { | |
3469 | ret = lttng_metadata_printf(session, | |
3470 | " ... %lld,\n", | |
3471 | (long long) entry->end.value); | |
3472 | } else { | |
3473 | ret = lttng_metadata_printf(session, | |
3474 | " ... %llu,\n", | |
3475 | entry->end.value); | |
3476 | } | |
141ddf28 | 3477 | } |
7c559490 MD |
3478 | if (ret) |
3479 | goto end; | |
141ddf28 | 3480 | } |
141ddf28 MD |
3481 | } |
3482 | ret = print_tabs(session, nesting); | |
3483 | if (ret) | |
3484 | goto end; | |
ceabb767 | 3485 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3486 | end: |
3487 | return ret; | |
3488 | } | |
3489 | ||
d83004aa JD |
3490 | /* |
3491 | * Must be called with sessions_mutex held. | |
3492 | */ | |
c099397a | 3493 | static |
8cdc1a81 | 3494 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3495 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3496 | size_t nesting) |
3497 | { | |
3498 | int ret; | |
437d5aa5 | 3499 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3500 | |
437d5aa5 MD |
3501 | enum_type = lttng_kernel_get_type_enum(field->type); |
3502 | WARN_ON_ONCE(!enum_type); | |
3503 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3504 | if (ret) |
3505 | return ret; | |
3506 | return lttng_field_name_statedump(session, field, nesting); | |
3507 | } | |
3508 | ||
3509 | static | |
8cdc1a81 | 3510 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3511 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3512 | size_t nesting) |
3513 | { | |
3514 | int ret; | |
3515 | ||
437d5aa5 MD |
3516 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3517 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3518 | if (ret) |
3519 | return ret; | |
3520 | return lttng_field_name_statedump(session, field, nesting); | |
3521 | } | |
3522 | ||
3523 | static | |
8cdc1a81 | 3524 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3525 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3526 | size_t nesting) |
3527 | { | |
3528 | int ret; | |
3529 | ||
ceabb767 MD |
3530 | /* Default encoding is UTF8 */ |
3531 | ret = print_tabs(session, nesting); | |
3532 | if (ret) | |
3533 | return ret; | |
3534 | ret = lttng_metadata_printf(session, | |
3535 | "string%s", | |
437d5aa5 | 3536 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3537 | " { encoding = ASCII; }" : ""); |
3538 | return ret; | |
3539 | } | |
3540 | ||
3541 | static | |
8cdc1a81 | 3542 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3543 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3544 | size_t nesting) |
ceabb767 | 3545 | { |
437d5aa5 | 3546 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3547 | int ret; |
3548 | ||
437d5aa5 MD |
3549 | string_type = lttng_kernel_get_type_string(field->type); |
3550 | WARN_ON_ONCE(!string_type); | |
3551 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3552 | if (ret) |
3553 | return ret; | |
3554 | return lttng_field_name_statedump(session, field, nesting); | |
3555 | } | |
3556 | ||
3557 | /* | |
3558 | * Must be called with sessions_mutex held. | |
3559 | */ | |
3560 | static | |
8cdc1a81 | 3561 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3562 | const struct lttng_kernel_type_common *type, |
3563 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3564 | size_t nesting) |
c099397a | 3565 | { |
c099397a | 3566 | int ret = 0; |
c099397a | 3567 | |
12bb2edb MD |
3568 | switch (type->type) { |
3569 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3570 | ret = _lttng_integer_type_statedump(session, |
3571 | lttng_kernel_get_type_integer(type), | |
3572 | parent_encoding, nesting); | |
8070f5c0 | 3573 | break; |
437d5aa5 MD |
3574 | case lttng_kernel_type_enum: |
3575 | ret = _lttng_enum_type_statedump(session, | |
3576 | lttng_kernel_get_type_enum(type), | |
3577 | nesting); | |
8070f5c0 | 3578 | break; |
12bb2edb | 3579 | case lttng_kernel_type_string: |
437d5aa5 MD |
3580 | ret = _lttng_string_type_statedump(session, |
3581 | lttng_kernel_get_type_string(type), | |
3582 | nesting); | |
ceabb767 | 3583 | break; |
437d5aa5 MD |
3584 | case lttng_kernel_type_struct: |
3585 | ret = _lttng_struct_type_statedump(session, | |
3586 | lttng_kernel_get_type_struct(type), | |
3587 | nesting); | |
8070f5c0 | 3588 | break; |
437d5aa5 MD |
3589 | case lttng_kernel_type_variant: |
3590 | ret = _lttng_variant_type_statedump(session, | |
3591 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3592 | nesting, NULL); |
ceabb767 MD |
3593 | break; |
3594 | ||
3595 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3596 | case lttng_kernel_type_array: |
3597 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3598 | default: |
3599 | WARN_ON_ONCE(1); | |
3600 | return -EINVAL; | |
8070f5c0 | 3601 | } |
ceabb767 MD |
3602 | return ret; |
3603 | } | |
8070f5c0 | 3604 | |
ceabb767 MD |
3605 | /* |
3606 | * Must be called with sessions_mutex held. | |
3607 | */ | |
3608 | static | |
8cdc1a81 | 3609 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3610 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3611 | size_t nesting, |
3612 | const char **prev_field_name_p) | |
ceabb767 | 3613 | { |
51ef4536 | 3614 | const char *prev_field_name = NULL; |
ceabb767 | 3615 | int ret = 0; |
27d2368e | 3616 | |
51ef4536 MD |
3617 | if (prev_field_name_p) |
3618 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3619 | switch (field->type->type) { |
12bb2edb | 3620 | case lttng_kernel_type_integer: |
ceabb767 MD |
3621 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3622 | break; | |
437d5aa5 | 3623 | case lttng_kernel_type_enum: |
ceabb767 | 3624 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3625 | break; |
12bb2edb | 3626 | case lttng_kernel_type_string: |
ceabb767 | 3627 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3628 | break; |
437d5aa5 | 3629 | case lttng_kernel_type_struct: |
ceabb767 | 3630 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3631 | break; |
437d5aa5 | 3632 | case lttng_kernel_type_array: |
ceabb767 | 3633 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3634 | break; |
437d5aa5 | 3635 | case lttng_kernel_type_sequence: |
51ef4536 | 3636 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3637 | break; |
437d5aa5 | 3638 | case lttng_kernel_type_variant: |
51ef4536 | 3639 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3640 | break; |
f513b2bf | 3641 | |
8070f5c0 MD |
3642 | default: |
3643 | WARN_ON_ONCE(1); | |
3644 | return -EINVAL; | |
3645 | } | |
51ef4536 MD |
3646 | if (prev_field_name_p) |
3647 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3648 | return ret; |
3649 | } | |
3650 | ||
3651 | static | |
8cdc1a81 | 3652 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3653 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3654 | { |
51ef4536 | 3655 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3656 | int ret = 0; |
3657 | int i; | |
3658 | ||
3659 | if (!ctx) | |
3660 | return 0; | |
3661 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3662 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3663 | |
51ef4536 | 3664 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3665 | if (ret) |
3666 | return ret; | |
3667 | } | |
3668 | return ret; | |
3669 | } | |
3670 | ||
3671 | static | |
8cdc1a81 | 3672 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3673 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3674 | { |
51ef4536 | 3675 | const char *prev_field_name = NULL; |
a67ba386 | 3676 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3677 | int ret = 0; |
3678 | int i; | |
3679 | ||
6c8c025b MD |
3680 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3681 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3682 | |
51ef4536 | 3683 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3684 | if (ret) |
3685 | return ret; | |
c099397a MD |
3686 | } |
3687 | return ret; | |
3688 | } | |
3689 | ||
d83004aa JD |
3690 | /* |
3691 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3692 | * The entire event metadata is printed as a single atomic metadata |
3693 | * transaction. | |
d83004aa | 3694 | */ |
c099397a | 3695 | static |
8cdc1a81 | 3696 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3697 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3698 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3699 | { |
3700 | int ret = 0; | |
3701 | ||
a67ba386 | 3702 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3703 | return 0; |
f7d06400 | 3704 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3705 | return 0; |
3706 | ||
8b97fd42 MD |
3707 | lttng_metadata_begin(session); |
3708 | ||
c099397a MD |
3709 | ret = lttng_metadata_printf(session, |
3710 | "event {\n" | |
ae734547 | 3711 | " name = \"%s\";\n" |
c099397a | 3712 | " id = %u;\n" |
b9074a1b | 3713 | " stream_id = %u;\n", |
a67ba386 MD |
3714 | event_recorder->priv->parent.desc->event_name, |
3715 | event_recorder->priv->id, | |
f7d06400 | 3716 | event_recorder->chan->priv->id); |
c099397a MD |
3717 | if (ret) |
3718 | goto end; | |
3719 | ||
8070f5c0 | 3720 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3721 | " fields := struct {\n" |
3722 | ); | |
3723 | if (ret) | |
3724 | goto end; | |
3725 | ||
a67ba386 | 3726 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3727 | if (ret) |
3728 | goto end; | |
3729 | ||
3730 | /* | |
3731 | * LTTng space reservation can only reserve multiples of the | |
3732 | * byte size. | |
3733 | */ | |
3734 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3735 | " };\n" |
3736 | "};\n\n"); | |
c099397a MD |
3737 | if (ret) |
3738 | goto end; | |
3739 | ||
a67ba386 | 3740 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3741 | end: |
8b97fd42 | 3742 | lttng_metadata_end(session); |
c099397a MD |
3743 | return ret; |
3744 | ||
3745 | } | |
3746 | ||
d83004aa JD |
3747 | /* |
3748 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3749 | * The entire channel metadata is printed as a single atomic metadata |
3750 | * transaction. | |
d83004aa | 3751 | */ |
c099397a | 3752 | static |
8cdc1a81 | 3753 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3754 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3755 | { |
3756 | int ret = 0; | |
3757 | ||
f7d06400 | 3758 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3759 | return 0; |
d83004aa | 3760 | |
f7d06400 | 3761 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3762 | return 0; |
3763 | ||
8b97fd42 MD |
3764 | lttng_metadata_begin(session); |
3765 | ||
f7d06400 | 3766 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3767 | ret = lttng_metadata_printf(session, |
3768 | "stream {\n" | |
3769 | " id = %u;\n" | |
9115fbdc | 3770 | " event.header := %s;\n" |
b9074a1b | 3771 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3772 | chan->priv->id, |
3773 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3774 | "struct event_header_large"); |
3775 | if (ret) | |
3776 | goto end; | |
3777 | ||
f7d06400 | 3778 | if (chan->priv->ctx) { |
b9074a1b MD |
3779 | ret = lttng_metadata_printf(session, |
3780 | " event.context := struct {\n"); | |
3781 | if (ret) | |
3782 | goto end; | |
3783 | } | |
f7d06400 | 3784 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3785 | if (ret) |
3786 | goto end; | |
f7d06400 | 3787 | if (chan->priv->ctx) { |
b9074a1b MD |
3788 | ret = lttng_metadata_printf(session, |
3789 | " };\n"); | |
3790 | if (ret) | |
3791 | goto end; | |
3792 | } | |
8070f5c0 MD |
3793 | |
3794 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3795 | "};\n\n"); |
8070f5c0 | 3796 | |
f7d06400 | 3797 | chan->priv->metadata_dumped = 1; |
c099397a | 3798 | end: |
8b97fd42 | 3799 | lttng_metadata_end(session); |
c099397a MD |
3800 | return ret; |
3801 | } | |
3802 | ||
d83004aa JD |
3803 | /* |
3804 | * Must be called with sessions_mutex held. | |
3805 | */ | |
9115fbdc | 3806 | static |
8cdc1a81 | 3807 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3808 | { |
3809 | return lttng_metadata_printf(session, | |
3810 | "struct packet_context {\n" | |
a3ccff4f MD |
3811 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3812 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3813 | " uint64_t content_size;\n" |
3814 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3815 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3816 | " unsigned long events_discarded;\n" |
9115fbdc | 3817 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3818 | "};\n\n" |
9115fbdc MD |
3819 | ); |
3820 | } | |
3821 | ||
3822 | /* | |
3823 | * Compact header: | |
3824 | * id: range: 0 - 30. | |
3825 | * id 31 is reserved to indicate an extended header. | |
3826 | * | |
3827 | * Large header: | |
3828 | * id: range: 0 - 65534. | |
3829 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3830 | * |
3831 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3832 | */ |
3833 | static | |
8cdc1a81 | 3834 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3835 | { |
3836 | return lttng_metadata_printf(session, | |
3837 | "struct event_header_compact {\n" | |
3838 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3839 | " variant <id> {\n" | |
3840 | " struct {\n" | |
a3ccff4f | 3841 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3842 | " } compact;\n" |
3843 | " struct {\n" | |
3844 | " uint32_t id;\n" | |
a3ccff4f | 3845 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3846 | " } extended;\n" |
3847 | " } v;\n" | |
3848 | "} align(%u);\n" | |
3849 | "\n" | |
3850 | "struct event_header_large {\n" | |
3851 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3852 | " variant <id> {\n" | |
3853 | " struct {\n" | |
a3ccff4f | 3854 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3855 | " } compact;\n" |
3856 | " struct {\n" | |
3857 | " uint32_t id;\n" | |
a3ccff4f | 3858 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3859 | " } extended;\n" |
3860 | " } v;\n" | |
3861 | "} align(%u);\n\n", | |
a90917c3 MD |
3862 | lttng_alignof(uint32_t) * CHAR_BIT, |
3863 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3864 | ); |
3865 | } | |
3866 | ||
a3ccff4f MD |
3867 | /* |
3868 | * Approximation of NTP time of day to clock monotonic correlation, | |
3869 | * taken at start of trace. | |
3870 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3871 | * in future versions. | |
5283350b MD |
3872 | * This function may return a negative offset. It may happen if the |
3873 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3874 | * |
3875 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3876 | * y2038 compliant. | |
a3ccff4f MD |
3877 | */ |
3878 | static | |
8967b2a3 | 3879 | int64_t measure_clock_offset(void) |
a3ccff4f | 3880 | { |
dcb93448 | 3881 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3882 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3883 | int64_t offset; |
a3ccff4f | 3884 | unsigned long flags; |
3636085f MJ |
3885 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3886 | struct timespec64 rts = { 0, 0 }; | |
3887 | #else | |
3888 | struct timespec rts = { 0, 0 }; | |
3889 | #endif | |
a3ccff4f MD |
3890 | |
3891 | /* Disable interrupts to increase correlation precision. */ | |
3892 | local_irq_save(flags); | |
3893 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3894 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3895 | ktime_get_real_ts64(&rts); | |
3896 | #else | |
216b6baa | 3897 | getnstimeofday(&rts); |
3636085f | 3898 | #endif |
a3ccff4f MD |
3899 | monotonic[1] = trace_clock_read64(); |
3900 | local_irq_restore(flags); | |
3901 | ||
dcb93448 | 3902 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3903 | realtime = (uint64_t) rts.tv_sec * tcf; |
3904 | if (tcf == NSEC_PER_SEC) { | |
3905 | realtime += rts.tv_nsec; | |
3906 | } else { | |
3907 | uint64_t n = rts.tv_nsec * tcf; | |
3908 | ||
3909 | do_div(n, NSEC_PER_SEC); | |
3910 | realtime += n; | |
3911 | } | |
dcb93448 | 3912 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3913 | return offset; |
3914 | } | |
3915 | ||
3eb95be4 | 3916 | static |
8cdc1a81 | 3917 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3918 | { |
0f3eaad4 | 3919 | int ret = 0; |
3eb95be4 JR |
3920 | size_t i; |
3921 | char cur; | |
3922 | ||
3923 | i = 0; | |
3924 | cur = string[i]; | |
3925 | while (cur != '\0') { | |
3926 | switch (cur) { | |
3927 | case '\n': | |
3928 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3929 | break; | |
3930 | case '\\': | |
3931 | case '"': | |
3932 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3933 | if (ret) | |
3934 | goto error; | |
3935 | /* We still print the current char */ | |
c190d76e | 3936 | lttng_fallthrough; |
3eb95be4 JR |
3937 | default: |
3938 | ret = lttng_metadata_printf(session, "%c", cur); | |
3939 | break; | |
3940 | } | |
3941 | ||
3942 | if (ret) | |
3943 | goto error; | |
3944 | ||
3945 | cur = string[++i]; | |
3946 | } | |
3947 | error: | |
3948 | return ret; | |
3949 | } | |
3950 | ||
3951 | static | |
8cdc1a81 | 3952 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3953 | const char *field_value) |
3eb95be4 JR |
3954 | { |
3955 | int ret; | |
3956 | ||
1c88f269 | 3957 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3958 | if (ret) |
3959 | goto error; | |
3960 | ||
1c88f269 | 3961 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3962 | if (ret) |
3963 | goto error; | |
3964 | ||
3965 | ret = lttng_metadata_printf(session, "\";\n"); | |
3966 | ||
3967 | error: | |
3968 | return ret; | |
3969 | } | |
3970 | ||
c099397a MD |
3971 | /* |
3972 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3973 | * Must be called with sessions_mutex held. |
c099397a MD |
3974 | */ |
3975 | static | |
8cdc1a81 | 3976 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3977 | { |
8cdc1a81 | 3978 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3979 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3980 | const char *product_uuid; |
f7d06400 | 3981 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3982 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3983 | int ret = 0; |
3984 | ||
585e5dcc | 3985 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3986 | return 0; |
8b97fd42 MD |
3987 | |
3988 | lttng_metadata_begin(session); | |
3989 | ||
8cdc1a81 | 3990 | if (session->priv->metadata_dumped) |
c099397a | 3991 | goto skip_session; |
c099397a | 3992 | |
d793d5e1 | 3993 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3994 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3995 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3996 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3997 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3998 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3999 | |
4000 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
4001 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
4002 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
4003 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
4004 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 4005 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
4006 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
4007 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
4008 | "\n" |
4009 | "trace {\n" | |
4010 | " major = %u;\n" | |
4011 | " minor = %u;\n" | |
30bdb6e4 | 4012 | " uuid = \"%s\";\n" |
d793d5e1 MD |
4013 | " byte_order = %s;\n" |
4014 | " packet.header := struct {\n" | |
4015 | " uint32_t magic;\n" | |
1ec3f75a | 4016 | " uint8_t uuid[16];\n" |
d793d5e1 | 4017 | " uint32_t stream_id;\n" |
5594698f | 4018 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 4019 | " };\n" |
d793d5e1 | 4020 | "};\n\n", |
a90917c3 MD |
4021 | lttng_alignof(uint8_t) * CHAR_BIT, |
4022 | lttng_alignof(uint16_t) * CHAR_BIT, | |
4023 | lttng_alignof(uint32_t) * CHAR_BIT, | |
4024 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
4025 | sizeof(unsigned long) * CHAR_BIT, |
4026 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
4027 | CTF_SPEC_MAJOR, |
4028 | CTF_SPEC_MINOR, | |
d793d5e1 | 4029 | uuid_s, |
5214fa50 | 4030 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
4031 | "be" |
4032 | #else | |
4033 | "le" | |
4034 | #endif | |
4035 | ); | |
4036 | if (ret) | |
4037 | goto end; | |
4038 | ||
99dc9597 MD |
4039 | ret = lttng_metadata_printf(session, |
4040 | "env {\n" | |
a6058143 | 4041 | " hostname = \"%s\";\n" |
c6c9e10f | 4042 | " domain = \"kernel\";\n" |
99dc9597 | 4043 | " sysname = \"%s\";\n" |
c6c9e10f MD |
4044 | " kernel_release = \"%s\";\n" |
4045 | " kernel_version = \"%s\";\n" | |
4046 | " tracer_name = \"lttng-modules\";\n" | |
4047 | " tracer_major = %d;\n" | |
4048 | " tracer_minor = %d;\n" | |
4049 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 4050 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 4051 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
4052 | utsname()->sysname, |
4053 | utsname()->release, | |
c6c9e10f MD |
4054 | utsname()->version, |
4055 | LTTNG_MODULES_MAJOR_VERSION, | |
4056 | LTTNG_MODULES_MINOR_VERSION, | |
4057 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
4058 | ); |
4059 | if (ret) | |
4060 | goto end; | |
4061 | ||
8cdc1a81 | 4062 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
4063 | if (ret) |
4064 | goto end; | |
4065 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 4066 | session->priv->creation_time); |
3eb95be4 JR |
4067 | if (ret) |
4068 | goto end; | |
4069 | ||
c88f762e GB |
4070 | /* Add the product UUID to the 'env' section */ |
4071 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4072 | if (product_uuid) { | |
4073 | ret = lttng_metadata_printf(session, | |
4074 | " product_uuid = \"%s\";\n", | |
4075 | product_uuid | |
4076 | ); | |
4077 | if (ret) | |
4078 | goto end; | |
4079 | } | |
4080 | ||
4081 | /* Close the 'env' section */ | |
3eb95be4 JR |
4082 | ret = lttng_metadata_printf(session, "};\n\n"); |
4083 | if (ret) | |
4084 | goto end; | |
4085 | ||
a3ccff4f MD |
4086 | ret = lttng_metadata_printf(session, |
4087 | "clock {\n" | |
2754583e MD |
4088 | " name = \"%s\";\n", |
4089 | trace_clock_name() | |
a82c63f1 MD |
4090 | ); |
4091 | if (ret) | |
4092 | goto end; | |
4093 | ||
4094 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4095 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4096 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4097 | clock_uuid_s |
4098 | ); | |
4099 | if (ret) | |
4100 | goto end; | |
4101 | } | |
4102 | ||
4103 | ret = lttng_metadata_printf(session, | |
2754583e | 4104 | " description = \"%s\";\n" |
a3ccff4f MD |
4105 | " freq = %llu; /* Frequency, in Hz */\n" |
4106 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4107 | " offset = %lld;\n" |
a3ccff4f | 4108 | "};\n\n", |
2754583e | 4109 | trace_clock_description(), |
a3ccff4f | 4110 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4111 | (long long) measure_clock_offset() |
a3ccff4f MD |
4112 | ); |
4113 | if (ret) | |
4114 | goto end; | |
4115 | ||
4116 | ret = lttng_metadata_printf(session, | |
4117 | "typealias integer {\n" | |
4118 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4119 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4120 | "} := uint27_clock_monotonic_t;\n" |
4121 | "\n" | |
4122 | "typealias integer {\n" | |
4123 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4124 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4125 | "} := uint32_clock_monotonic_t;\n" |
4126 | "\n" | |
4127 | "typealias integer {\n" | |
4128 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4129 | " map = clock.%s.value;\n" |
a3ccff4f | 4130 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4131 | trace_clock_name(), |
a3ccff4f | 4132 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4133 | trace_clock_name(), |
4134 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4135 | trace_clock_name() | |
a3ccff4f MD |
4136 | ); |
4137 | if (ret) | |
4138 | goto end; | |
4139 | ||
a90917c3 | 4140 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4141 | if (ret) |
4142 | goto end; | |
4143 | ||
a90917c3 | 4144 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4145 | if (ret) |
4146 | goto end; | |
4147 | ||
c099397a | 4148 | skip_session: |
f7d06400 MD |
4149 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4150 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4151 | if (ret) |
4152 | goto end; | |
4153 | } | |
4154 | ||
8cdc1a81 | 4155 | list_for_each_entry(event_recorder_priv, &session->priv->events, node) { |
a67ba386 MD |
4156 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4157 | event_recorder_priv->pub); | |
c099397a MD |
4158 | if (ret) |
4159 | goto end; | |
4160 | } | |
8cdc1a81 | 4161 | session->priv->metadata_dumped = 1; |
c099397a | 4162 | end: |
8b97fd42 | 4163 | lttng_metadata_end(session); |
c099397a MD |
4164 | return ret; |
4165 | } | |
4166 | ||
c0e31d2e | 4167 | /** |
a90917c3 | 4168 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4169 | * @transport: transport structure |
4170 | * | |
4171 | * Registers a transport which can be used as output to extract the data out of | |
4172 | * LTTng. The module calling this registration function must ensure that no | |
4173 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4174 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4175 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4176 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4177 | * after its registration must it synchronize the TLBs. |
4178 | */ | |
a90917c3 | 4179 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4180 | { |
4181 | /* | |
4182 | * Make sure no page fault can be triggered by the module about to be | |
4183 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4184 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4185 | */ |
263b6c88 | 4186 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4187 | |
4188 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4189 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4190 | mutex_unlock(&sessions_mutex); |
4191 | } | |
a90917c3 | 4192 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4193 | |
4194 | /** | |
a90917c3 | 4195 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4196 | * @transport: transport structure |
4197 | */ | |
a90917c3 | 4198 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4199 | { |
4200 | mutex_lock(&sessions_mutex); | |
4201 | list_del(&transport->node); | |
4202 | mutex_unlock(&sessions_mutex); | |
4203 | } | |
a90917c3 | 4204 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4205 | |
a101fa10 MD |
4206 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4207 | { | |
4208 | /* | |
4209 | * Make sure no page fault can be triggered by the module about to be | |
4210 | * registered. We deal with this here so we don't have to call | |
4211 | * vmalloc_sync_mappings() in each module's init. | |
4212 | */ | |
4213 | wrapper_vmalloc_sync_mappings(); | |
4214 | ||
4215 | mutex_lock(&sessions_mutex); | |
4216 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4217 | mutex_unlock(&sessions_mutex); | |
4218 | } | |
4219 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4220 | ||
4221 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4222 | { | |
4223 | mutex_lock(&sessions_mutex); | |
4224 | list_del(&transport->node); | |
4225 | mutex_unlock(&sessions_mutex); | |
4226 | } | |
4227 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4228 | ||
5f4c791e | 4229 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4230 | |
4231 | enum cpuhp_state lttng_hp_prepare; | |
4232 | enum cpuhp_state lttng_hp_online; | |
4233 | ||
4234 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4235 | { | |
4236 | struct lttng_cpuhp_node *lttng_node; | |
4237 | ||
4238 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4239 | switch (lttng_node->component) { | |
4240 | case LTTNG_RING_BUFFER_FRONTEND: | |
4241 | return 0; | |
4242 | case LTTNG_RING_BUFFER_BACKEND: | |
4243 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4244 | case LTTNG_RING_BUFFER_ITER: | |
4245 | return 0; | |
4246 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4247 | return 0; | |
4248 | default: | |
4249 | return -EINVAL; | |
4250 | } | |
4251 | } | |
4252 | ||
4253 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4254 | { | |
4255 | struct lttng_cpuhp_node *lttng_node; | |
4256 | ||
4257 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4258 | switch (lttng_node->component) { | |
4259 | case LTTNG_RING_BUFFER_FRONTEND: | |
4260 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4261 | case LTTNG_RING_BUFFER_BACKEND: | |
4262 | return 0; | |
4263 | case LTTNG_RING_BUFFER_ITER: | |
4264 | return 0; | |
4265 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4266 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4267 | default: | |
4268 | return -EINVAL; | |
4269 | } | |
4270 | } | |
4271 | ||
4272 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4273 | { | |
4274 | struct lttng_cpuhp_node *lttng_node; | |
4275 | ||
4276 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4277 | switch (lttng_node->component) { | |
4278 | case LTTNG_RING_BUFFER_FRONTEND: | |
4279 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4280 | case LTTNG_RING_BUFFER_BACKEND: | |
4281 | return 0; | |
4282 | case LTTNG_RING_BUFFER_ITER: | |
4283 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4284 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4285 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4286 | default: | |
4287 | return -EINVAL; | |
4288 | } | |
4289 | } | |
4290 | ||
4291 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4292 | { | |
4293 | struct lttng_cpuhp_node *lttng_node; | |
4294 | ||
4295 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4296 | switch (lttng_node->component) { | |
4297 | case LTTNG_RING_BUFFER_FRONTEND: | |
4298 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4299 | case LTTNG_RING_BUFFER_BACKEND: | |
4300 | return 0; | |
4301 | case LTTNG_RING_BUFFER_ITER: | |
4302 | return 0; | |
4303 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4304 | return 0; | |
4305 | default: | |
4306 | return -EINVAL; | |
4307 | } | |
4308 | } | |
4309 | ||
4310 | static int __init lttng_init_cpu_hotplug(void) | |
4311 | { | |
4312 | int ret; | |
4313 | ||
4314 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4315 | lttng_hotplug_prepare, | |
4316 | lttng_hotplug_dead); | |
4317 | if (ret < 0) { | |
4318 | return ret; | |
4319 | } | |
4320 | lttng_hp_prepare = ret; | |
4321 | lttng_rb_set_hp_prepare(ret); | |
4322 | ||
4323 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4324 | lttng_hotplug_online, | |
4325 | lttng_hotplug_offline); | |
4326 | if (ret < 0) { | |
4327 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4328 | lttng_hp_prepare = 0; | |
4329 | return ret; | |
4330 | } | |
4331 | lttng_hp_online = ret; | |
4332 | lttng_rb_set_hp_online(ret); | |
4333 | ||
4334 | return 0; | |
4335 | } | |
4336 | ||
4337 | static void __exit lttng_exit_cpu_hotplug(void) | |
4338 | { | |
4339 | lttng_rb_set_hp_online(0); | |
4340 | cpuhp_remove_multi_state(lttng_hp_online); | |
4341 | lttng_rb_set_hp_prepare(0); | |
4342 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4343 | } | |
4344 | ||
5f4c791e | 4345 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4346 | static int lttng_init_cpu_hotplug(void) |
4347 | { | |
4348 | return 0; | |
4349 | } | |
4350 | static void lttng_exit_cpu_hotplug(void) | |
4351 | { | |
4352 | } | |
5f4c791e | 4353 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4354 | |
a90917c3 | 4355 | static int __init lttng_events_init(void) |
4e3c1b9b | 4356 | { |
1c25284c MD |
4357 | int ret; |
4358 | ||
453b2495 JD |
4359 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4360 | if (ret) | |
4361 | return ret; | |
389d7070 | 4362 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4363 | if (ret) |
4364 | return ret; | |
4365 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4366 | if (ret) |
4367 | return ret; | |
4368 | ret = lttng_probes_init(); | |
389d7070 MD |
4369 | if (ret) |
4370 | return ret; | |
07dfc1d0 | 4371 | ret = lttng_context_init(); |
20591cf7 MD |
4372 | if (ret) |
4373 | return ret; | |
07dfc1d0 MD |
4374 | ret = lttng_tracepoint_init(); |
4375 | if (ret) | |
4376 | goto error_tp; | |
a67ba386 MD |
4377 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4378 | if (!event_recorder_cache) { | |
20591cf7 | 4379 | ret = -ENOMEM; |
a67ba386 | 4380 | goto error_kmem_event_recorder; |
dffef45d | 4381 | } |
a67ba386 MD |
4382 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4383 | if (!event_recorder_private_cache) { | |
4384 | ret = -ENOMEM; | |
4385 | goto error_kmem_event_recorder_private; | |
4386 | } | |
4387 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4388 | if (!event_notifier_cache) { |
4389 | ret = -ENOMEM; | |
4390 | goto error_kmem_event_notifier; | |
20591cf7 | 4391 | } |
a67ba386 MD |
4392 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4393 | if (!event_notifier_private_cache) { | |
4394 | ret = -ENOMEM; | |
4395 | goto error_kmem_event_notifier_private; | |
4396 | } | |
80996790 | 4397 | ret = lttng_abi_init(); |
02119ee5 MD |
4398 | if (ret) |
4399 | goto error_abi; | |
0c956676 MD |
4400 | ret = lttng_logger_init(); |
4401 | if (ret) | |
4402 | goto error_logger; | |
1e367326 MD |
4403 | ret = lttng_init_cpu_hotplug(); |
4404 | if (ret) | |
4405 | goto error_hotplug; | |
101215b7 | 4406 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4407 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4408 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4409 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4410 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4411 | LTTNG_VERSION_NAME, |
4412 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4413 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4414 | #else | |
4415 | "", | |
4416 | #endif | |
4417 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4418 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4419 | #else | |
4420 | ""); | |
4421 | #endif | |
c1551e57 MJ |
4422 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4423 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4424 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4425 | return 0; |
0c956676 | 4426 | |
1e367326 MD |
4427 | error_hotplug: |
4428 | lttng_logger_exit(); | |
0c956676 MD |
4429 | error_logger: |
4430 | lttng_abi_exit(); | |
02119ee5 | 4431 | error_abi: |
a67ba386 MD |
4432 | kmem_cache_destroy(event_notifier_private_cache); |
4433 | error_kmem_event_notifier_private: | |
dffef45d FD |
4434 | kmem_cache_destroy(event_notifier_cache); |
4435 | error_kmem_event_notifier: | |
a67ba386 MD |
4436 | kmem_cache_destroy(event_recorder_private_cache); |
4437 | error_kmem_event_recorder_private: | |
4438 | kmem_cache_destroy(event_recorder_cache); | |
4439 | error_kmem_event_recorder: | |
20591cf7 | 4440 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4441 | error_tp: |
4442 | lttng_context_exit(); | |
101215b7 | 4443 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4444 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4445 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4446 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4447 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4448 | LTTNG_VERSION_NAME, |
4449 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4450 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4451 | #else | |
4452 | "", | |
4453 | #endif | |
4454 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4455 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4456 | #else | |
4457 | ""); | |
4458 | #endif | |
1c25284c | 4459 | return ret; |
4e3c1b9b MD |
4460 | } |
4461 | ||
a90917c3 | 4462 | module_init(lttng_events_init); |
11b5a3c2 | 4463 | |
a90917c3 | 4464 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4465 | { |
8cdc1a81 | 4466 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4467 | |
1e367326 | 4468 | lttng_exit_cpu_hotplug(); |
0c956676 | 4469 | lttng_logger_exit(); |
80996790 | 4470 | lttng_abi_exit(); |
8cdc1a81 MD |
4471 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4472 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4473 | kmem_cache_destroy(event_recorder_cache); |
4474 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4475 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4476 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4477 | lttng_tracepoint_exit(); |
07dfc1d0 | 4478 | lttng_context_exit(); |
101215b7 | 4479 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4480 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4481 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4482 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4483 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4484 | LTTNG_VERSION_NAME, |
4485 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4486 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4487 | #else | |
4488 | "", | |
4489 | #endif | |
4490 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4491 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4492 | #else | |
4493 | ""); | |
4494 | #endif | |
4e3c1b9b | 4495 | } |
92e94819 | 4496 | |
a90917c3 | 4497 | module_exit(lttng_events_exit); |
11b5a3c2 | 4498 | |
7ca11e77 | 4499 | #include <generated/patches.h> |
101215b7 MJ |
4500 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4501 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4502 | #endif | |
4503 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4504 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4505 | #endif | |
92e94819 MD |
4506 | MODULE_LICENSE("GPL and additional rights"); |
4507 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4508 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4509 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4510 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4511 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4512 | LTTNG_MODULES_EXTRAVERSION); |