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; |
09710b83 | 356 | struct lttng_event_enabler_common *event_enabler, *tmp_event_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 | } | |
f237aef8 | 365 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.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 | } | |
09710b83 MD |
374 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, &session->priv->enablers_head, node) |
375 | lttng_event_enabler_destroy(event_enabler); | |
f237aef8 | 376 | list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, &session->priv->events, parent.node) |
0648898e | 377 | _lttng_event_destroy(&event_recorder_priv->pub->parent); |
f7d06400 MD |
378 | list_for_each_entry_safe(chan_priv, tmpchan_priv, &session->priv->chan, node) { |
379 | BUG_ON(chan_priv->channel_type == METADATA_CHANNEL); | |
380 | _lttng_channel_destroy(chan_priv->pub); | |
d83004aa | 381 | } |
8cdc1a81 MD |
382 | mutex_lock(&session->priv->metadata_cache->lock); |
383 | list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) | |
d83004aa | 384 | _lttng_metadata_channel_hangup(metadata_stream); |
8cdc1a81 | 385 | mutex_unlock(&session->priv->metadata_cache->lock); |
8c0393c3 MD |
386 | lttng_id_tracker_fini(&session->pid_tracker); |
387 | lttng_id_tracker_fini(&session->vpid_tracker); | |
388 | lttng_id_tracker_fini(&session->uid_tracker); | |
389 | lttng_id_tracker_fini(&session->vuid_tracker); | |
390 | lttng_id_tracker_fini(&session->gid_tracker); | |
391 | lttng_id_tracker_fini(&session->vgid_tracker); | |
8cdc1a81 MD |
392 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
393 | list_del(&session->priv->list); | |
4e3c1b9b | 394 | mutex_unlock(&sessions_mutex); |
8cdc1a81 | 395 | lttng_kvfree(session->priv); |
48f5e0b5 | 396 | lttng_kvfree(session); |
4e3c1b9b MD |
397 | } |
398 | ||
dffef45d FD |
399 | void lttng_event_notifier_group_destroy( |
400 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 401 | { |
09710b83 | 402 | struct lttng_event_enabler_common *event_enabler, *tmp_event_enabler; |
a67ba386 | 403 | struct lttng_kernel_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; |
dffef45d FD |
404 | int ret; |
405 | ||
750b05f2 FD |
406 | if (!event_notifier_group) |
407 | return; | |
408 | ||
409 | mutex_lock(&sessions_mutex); | |
dffef45d | 410 | |
6053e75e | 411 | ret = lttng_syscalls_unregister_syscall_table(&event_notifier_group->syscall_table); |
8a8ac9a8 FD |
412 | WARN_ON(ret); |
413 | ||
a67ba386 | 414 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
f237aef8 | 415 | &event_notifier_group->event_notifiers_head, parent.node) { |
f0bcc14c | 416 | ret = _lttng_event_unregister(&event_notifier_priv->pub->parent); |
dffef45d FD |
417 | WARN_ON(ret); |
418 | } | |
419 | ||
b01155ba FD |
420 | /* Wait for in-flight event notifier to complete */ |
421 | synchronize_trace(); | |
422 | ||
21f58fb7 FD |
423 | irq_work_sync(&event_notifier_group->wakeup_pending); |
424 | ||
6053e75e MD |
425 | ret = lttng_syscalls_destroy_syscall_table(&event_notifier_group->syscall_table); |
426 | WARN_ON(ret); | |
8a8ac9a8 | 427 | |
09710b83 | 428 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
dffef45d | 429 | &event_notifier_group->enablers_head, node) |
09710b83 | 430 | lttng_event_enabler_destroy(event_enabler); |
dffef45d | 431 | |
a67ba386 | 432 | list_for_each_entry_safe(event_notifier_priv, tmpevent_notifier_priv, |
f237aef8 | 433 | &event_notifier_group->event_notifiers_head, parent.node) |
0648898e | 434 | _lttng_event_destroy(&event_notifier_priv->pub->parent); |
dffef45d | 435 | |
99f52fcc FD |
436 | if (event_notifier_group->error_counter) { |
437 | struct lttng_counter *error_counter = event_notifier_group->error_counter; | |
ab04d7b1 | 438 | |
99f52fcc FD |
439 | error_counter->ops->counter_destroy(error_counter->counter); |
440 | module_put(error_counter->transport->owner); | |
441 | lttng_kvfree(error_counter); | |
442 | event_notifier_group->error_counter = NULL; | |
443 | } | |
444 | ||
4a399b76 | 445 | event_notifier_group->ops->priv->channel_destroy(event_notifier_group->chan); |
750b05f2 FD |
446 | module_put(event_notifier_group->transport->owner); |
447 | list_del(&event_notifier_group->node); | |
dffef45d | 448 | |
750b05f2 FD |
449 | mutex_unlock(&sessions_mutex); |
450 | lttng_kvfree(event_notifier_group); | |
451 | } | |
452 | ||
8cdc1a81 | 453 | int lttng_session_statedump(struct lttng_kernel_session *session) |
601252cf MD |
454 | { |
455 | int ret; | |
456 | ||
457 | mutex_lock(&sessions_mutex); | |
458 | ret = lttng_statedump_start(session); | |
459 | mutex_unlock(&sessions_mutex); | |
460 | return ret; | |
461 | } | |
462 | ||
8cdc1a81 | 463 | int lttng_session_enable(struct lttng_kernel_session *session) |
c0e31d2e MD |
464 | { |
465 | int ret = 0; | |
f7d06400 | 466 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
467 | |
468 | mutex_lock(&sessions_mutex); | |
469 | if (session->active) { | |
470 | ret = -EBUSY; | |
471 | goto end; | |
472 | } | |
c099397a | 473 | |
3c997079 | 474 | /* Set transient enabler state to "enabled" */ |
8cdc1a81 | 475 | session->priv->tstate = 1; |
3c997079 | 476 | |
4ef81e4a | 477 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 478 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 479 | |
c099397a MD |
480 | /* |
481 | * Snapshot the number of events per channel to know the type of header | |
482 | * we need to use. | |
483 | */ | |
f7d06400 MD |
484 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
485 | if (chan_priv->header_type) | |
486 | continue; /* don't change it if session stop/restart */ | |
487 | if (chan_priv->free_event_id < 31) | |
488 | chan_priv->header_type = 1; /* compact */ | |
c099397a | 489 | else |
f7d06400 | 490 | chan_priv->header_type = 2; /* large */ |
c099397a MD |
491 | } |
492 | ||
64af2437 | 493 | /* Clear each stream's quiescent state. */ |
f7d06400 MD |
494 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
495 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
496 | lib_ring_buffer_clear_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 497 | } |
64af2437 | 498 | |
a8f2d0c7 | 499 | WRITE_ONCE(session->active, 1); |
8cdc1a81 | 500 | WRITE_ONCE(session->priv->been_active, 1); |
a90917c3 | 501 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 502 | if (ret) { |
a8f2d0c7 | 503 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
504 | goto end; |
505 | } | |
506 | ret = lttng_statedump_start(session); | |
360f38ea | 507 | if (ret) |
a8f2d0c7 | 508 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
509 | end: |
510 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 511 | return ret; |
c0e31d2e MD |
512 | } |
513 | ||
8cdc1a81 | 514 | int lttng_session_disable(struct lttng_kernel_session *session) |
c0e31d2e MD |
515 | { |
516 | int ret = 0; | |
f7d06400 | 517 | struct lttng_kernel_channel_buffer_private *chan_priv; |
c0e31d2e MD |
518 | |
519 | mutex_lock(&sessions_mutex); | |
520 | if (!session->active) { | |
521 | ret = -EBUSY; | |
522 | goto end; | |
523 | } | |
a8f2d0c7 | 524 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
525 | |
526 | /* Set transient enabler state to "disabled" */ | |
8cdc1a81 | 527 | session->priv->tstate = 0; |
b2bc0bc8 | 528 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
529 | |
530 | /* Set each stream's quiescent state. */ | |
f7d06400 MD |
531 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
532 | if (chan_priv->channel_type != METADATA_CHANNEL) | |
533 | lib_ring_buffer_set_quiescent_channel(chan_priv->rb_chan); | |
09b93db9 | 534 | } |
c0e31d2e MD |
535 | end: |
536 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 537 | return ret; |
c0e31d2e MD |
538 | } |
539 | ||
8cdc1a81 | 540 | int lttng_session_metadata_regenerate(struct lttng_kernel_session *session) |
9616f0bf JD |
541 | { |
542 | int ret = 0; | |
f7d06400 | 543 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 544 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
8cdc1a81 | 545 | struct lttng_metadata_cache *cache = session->priv->metadata_cache; |
9616f0bf JD |
546 | struct lttng_metadata_stream *stream; |
547 | ||
548 | mutex_lock(&sessions_mutex); | |
549 | if (!session->active) { | |
550 | ret = -EBUSY; | |
551 | goto end; | |
552 | } | |
553 | ||
554 | mutex_lock(&cache->lock); | |
555 | memset(cache->data, 0, cache->cache_alloc); | |
556 | cache->metadata_written = 0; | |
557 | cache->version++; | |
8cdc1a81 | 558 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) { |
9616f0bf JD |
559 | stream->metadata_out = 0; |
560 | stream->metadata_in = 0; | |
561 | } | |
562 | mutex_unlock(&cache->lock); | |
563 | ||
8cdc1a81 | 564 | session->priv->metadata_dumped = 0; |
f7d06400 MD |
565 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
566 | chan_priv->metadata_dumped = 0; | |
9616f0bf JD |
567 | } |
568 | ||
f237aef8 | 569 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
a67ba386 | 570 | event_recorder_priv->metadata_dumped = 0; |
9616f0bf JD |
571 | } |
572 | ||
573 | ret = _lttng_session_metadata_statedump(session); | |
574 | ||
575 | end: | |
576 | mutex_unlock(&sessions_mutex); | |
577 | return ret; | |
578 | } | |
579 | ||
6b757027 MD |
580 | static |
581 | bool is_channel_buffer_metadata(struct lttng_kernel_channel_common *channel) | |
582 | { | |
583 | struct lttng_kernel_channel_buffer *chan_buf; | |
584 | ||
585 | if (channel->type != LTTNG_KERNEL_CHANNEL_TYPE_BUFFER) | |
586 | return false; | |
587 | chan_buf = container_of(channel, struct lttng_kernel_channel_buffer, parent); | |
588 | if (chan_buf->priv->channel_type == METADATA_CHANNEL) | |
589 | return true; | |
590 | return false; | |
591 | } | |
592 | ||
593 | int lttng_channel_enable(struct lttng_kernel_channel_common *channel) | |
e64957da | 594 | { |
3c997079 | 595 | int ret = 0; |
e64957da | 596 | |
3c997079 | 597 | mutex_lock(&sessions_mutex); |
6b757027 | 598 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
599 | ret = -EPERM; |
600 | goto end; | |
601 | } | |
6b757027 | 602 | if (channel->enabled) { |
3c997079 MD |
603 | ret = -EEXIST; |
604 | goto end; | |
605 | } | |
606 | /* Set transient enabler state to "enabled" */ | |
6b757027 MD |
607 | channel->priv->tstate = 1; |
608 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 | 609 | /* Set atomically the state to "enabled" */ |
6b757027 | 610 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
611 | end: |
612 | mutex_unlock(&sessions_mutex); | |
613 | return ret; | |
e64957da MD |
614 | } |
615 | ||
6b757027 | 616 | int lttng_channel_disable(struct lttng_kernel_channel_common *channel) |
e64957da | 617 | { |
3c997079 | 618 | int ret = 0; |
e64957da | 619 | |
3c997079 | 620 | mutex_lock(&sessions_mutex); |
6b757027 | 621 | if (is_channel_buffer_metadata(channel)) { |
3c997079 MD |
622 | ret = -EPERM; |
623 | goto end; | |
624 | } | |
6b757027 | 625 | if (!channel->enabled) { |
3c997079 MD |
626 | ret = -EEXIST; |
627 | goto end; | |
628 | } | |
629 | /* Set atomically the state to "disabled" */ | |
6b757027 | 630 | WRITE_ONCE(channel->enabled, 0); |
3c997079 | 631 | /* Set transient enabler state to "enabled" */ |
6b757027 MD |
632 | channel->priv->tstate = 0; |
633 | lttng_session_sync_event_enablers(channel->session); | |
3c997079 MD |
634 | end: |
635 | mutex_unlock(&sessions_mutex); | |
636 | return ret; | |
e64957da MD |
637 | } |
638 | ||
9d993668 | 639 | int lttng_event_enable(struct lttng_kernel_event_common *event) |
e64957da | 640 | { |
3c997079 | 641 | int ret = 0; |
e64957da | 642 | |
3c997079 | 643 | mutex_lock(&sessions_mutex); |
9d993668 MD |
644 | switch (event->type) { |
645 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
646 | { | |
647 | struct lttng_kernel_event_recorder *event_recorder = | |
648 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
649 | ||
f7d06400 | 650 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
651 | ret = -EPERM; |
652 | goto end; | |
653 | } | |
a0493bef | 654 | break; |
9d993668 MD |
655 | } |
656 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
657 | switch (event->priv->instrumentation) { | |
658 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
659 | ret = -EINVAL; | |
660 | goto end; | |
661 | default: | |
662 | break; | |
663 | } | |
a0493bef MD |
664 | break; |
665 | default: | |
9d993668 | 666 | break; |
a0493bef | 667 | } |
e64957da | 668 | |
9d993668 | 669 | if (event->enabled) { |
3c997079 MD |
670 | ret = -EEXIST; |
671 | goto end; | |
672 | } | |
a67ba386 | 673 | switch (event->priv->instrumentation) { |
c190d76e MJ |
674 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
675 | lttng_fallthrough; | |
606828e4 | 676 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
677 | ret = -EINVAL; |
678 | break; | |
b4a75708 | 679 | |
c190d76e MJ |
680 | case LTTNG_KERNEL_ABI_KPROBE: |
681 | lttng_fallthrough; | |
606828e4 | 682 | case LTTNG_KERNEL_ABI_UPROBE: |
9d993668 | 683 | WRITE_ONCE(event->enabled, 1); |
a0493bef | 684 | break; |
b4a75708 | 685 | |
606828e4 | 686 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9d993668 | 687 | ret = lttng_kretprobes_event_enable_state(event, 1); |
a0493bef | 688 | break; |
b4a75708 | 689 | |
c190d76e MJ |
690 | case LTTNG_KERNEL_ABI_FUNCTION: |
691 | lttng_fallthrough; | |
692 | case LTTNG_KERNEL_ABI_NOOP: | |
693 | lttng_fallthrough; | |
a0493bef MD |
694 | default: |
695 | WARN_ON_ONCE(1); | |
696 | ret = -EINVAL; | |
697 | } | |
3c997079 MD |
698 | end: |
699 | mutex_unlock(&sessions_mutex); | |
700 | return ret; | |
e64957da MD |
701 | } |
702 | ||
9d993668 | 703 | int lttng_event_disable(struct lttng_kernel_event_common *event) |
dffef45d FD |
704 | { |
705 | int ret = 0; | |
706 | ||
707 | mutex_lock(&sessions_mutex); | |
9d993668 MD |
708 | switch (event->type) { |
709 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
710 | { | |
711 | struct lttng_kernel_event_recorder *event_recorder = | |
712 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
713 | ||
f7d06400 | 714 | if (event_recorder->chan->priv->channel_type == METADATA_CHANNEL) { |
9d993668 MD |
715 | ret = -EPERM; |
716 | goto end; | |
717 | } | |
b01155ba | 718 | break; |
9d993668 MD |
719 | } |
720 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
721 | switch (event->priv->instrumentation) { | |
722 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
723 | ret = -EINVAL; | |
724 | goto end; | |
725 | default: | |
726 | break; | |
727 | } | |
2b16f0c9 | 728 | break; |
dffef45d | 729 | default: |
9d993668 | 730 | break; |
dffef45d | 731 | } |
dffef45d | 732 | |
a67ba386 | 733 | if (!event->enabled) { |
dffef45d FD |
734 | ret = -EEXIST; |
735 | goto end; | |
736 | } | |
a67ba386 | 737 | switch (event->priv->instrumentation) { |
c190d76e MJ |
738 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
739 | lttng_fallthrough; | |
606828e4 | 740 | case LTTNG_KERNEL_ABI_SYSCALL: |
b01155ba FD |
741 | ret = -EINVAL; |
742 | break; | |
b4a75708 | 743 | |
c190d76e MJ |
744 | case LTTNG_KERNEL_ABI_KPROBE: |
745 | lttng_fallthrough; | |
606828e4 | 746 | case LTTNG_KERNEL_ABI_UPROBE: |
a67ba386 | 747 | WRITE_ONCE(event->enabled, 0); |
2b16f0c9 | 748 | break; |
b4a75708 | 749 | |
9d993668 MD |
750 | case LTTNG_KERNEL_ABI_KRETPROBE: |
751 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
752 | break; | |
753 | ||
c190d76e MJ |
754 | case LTTNG_KERNEL_ABI_FUNCTION: |
755 | lttng_fallthrough; | |
756 | case LTTNG_KERNEL_ABI_NOOP: | |
757 | lttng_fallthrough; | |
dffef45d FD |
758 | default: |
759 | WARN_ON_ONCE(1); | |
760 | ret = -EINVAL; | |
761 | } | |
762 | end: | |
763 | mutex_unlock(&sessions_mutex); | |
764 | return ret; | |
765 | } | |
766 | ||
4e252d1e | 767 | struct lttng_kernel_channel_buffer *lttng_channel_buffer_create(struct lttng_kernel_session *session, |
5dbbdb43 MD |
768 | const char *transport_name, |
769 | void *buf_addr, | |
4e3c1b9b MD |
770 | size_t subbuf_size, size_t num_subbuf, |
771 | unsigned int switch_timer_interval, | |
d83004aa JD |
772 | unsigned int read_timer_interval, |
773 | enum channel_type channel_type) | |
4e3c1b9b | 774 | { |
f7d06400 MD |
775 | struct lttng_kernel_channel_buffer *chan; |
776 | struct lttng_kernel_channel_buffer_private *chan_priv; | |
a90917c3 | 777 | struct lttng_transport *transport = NULL; |
4e3c1b9b MD |
778 | |
779 | mutex_lock(&sessions_mutex); | |
8cdc1a81 | 780 | if (session->priv->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 781 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 782 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 783 | if (!transport) { |
5a15f70c | 784 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 785 | transport_name); |
c0e31d2e | 786 | goto notransport; |
f3d01b96 | 787 | } |
a33c9927 | 788 | if (!try_module_get(transport->owner)) { |
5a15f70c | 789 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
790 | goto notransport; |
791 | } | |
f7d06400 | 792 | chan = kzalloc(sizeof(struct lttng_kernel_channel_buffer), GFP_KERNEL); |
4e3c1b9b | 793 | if (!chan) |
c0e31d2e | 794 | goto nomem; |
f7d06400 MD |
795 | chan_priv = kzalloc(sizeof(struct lttng_kernel_channel_buffer_private), GFP_KERNEL); |
796 | if (!chan_priv) | |
797 | goto nomem_priv; | |
798 | chan->priv = chan_priv; | |
799 | chan_priv->pub = chan; | |
800 | chan->parent.type = LTTNG_KERNEL_CHANNEL_TYPE_BUFFER; | |
801 | chan->parent.session = session; | |
802 | chan->priv->id = session->priv->free_chan_id++; | |
3b731ab1 | 803 | chan->ops = &transport->ops; |
125b4df4 MD |
804 | /* |
805 | * Note: the channel creation op already writes into the packet | |
806 | * headers. Therefore the "chan" information used as input | |
807 | * should be already accessible. | |
808 | */ | |
f7d06400 | 809 | chan->priv->rb_chan = transport->ops.priv->channel_create(transport_name, |
5f5ddf01 MD |
810 | chan, buf_addr, subbuf_size, num_subbuf, |
811 | switch_timer_interval, read_timer_interval); | |
f7d06400 | 812 | if (!chan->priv->rb_chan) |
f3d01b96 | 813 | goto create_error; |
f7d06400 MD |
814 | chan->priv->parent.tstate = 1; |
815 | chan->parent.enabled = 1; | |
816 | chan->priv->transport = transport; | |
817 | chan->priv->channel_type = channel_type; | |
818 | list_add(&chan->priv->node, &session->priv->chan); | |
4e3c1b9b MD |
819 | mutex_unlock(&sessions_mutex); |
820 | return chan; | |
821 | ||
f3d01b96 | 822 | create_error: |
f7d06400 MD |
823 | kfree(chan_priv); |
824 | nomem_priv: | |
f3d01b96 | 825 | kfree(chan); |
c0e31d2e | 826 | nomem: |
a33c9927 MD |
827 | if (transport) |
828 | module_put(transport->owner); | |
c0e31d2e | 829 | notransport: |
e5382b6d | 830 | active: |
4e3c1b9b MD |
831 | mutex_unlock(&sessions_mutex); |
832 | return NULL; | |
833 | } | |
834 | ||
835 | /* | |
d83004aa JD |
836 | * Only used internally at session destruction for per-cpu channels, and |
837 | * when metadata channel is released. | |
838 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 839 | */ |
aa7c23a9 | 840 | static |
f7d06400 | 841 | void _lttng_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
4e3c1b9b | 842 | { |
f7d06400 MD |
843 | chan->ops->priv->channel_destroy(chan->priv->rb_chan); |
844 | module_put(chan->priv->transport->owner); | |
845 | list_del(&chan->priv->node); | |
846 | lttng_kernel_destroy_context(chan->priv->ctx); | |
847 | kfree(chan->priv); | |
4e3c1b9b MD |
848 | kfree(chan); |
849 | } | |
850 | ||
f7d06400 | 851 | void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan) |
d83004aa | 852 | { |
f7d06400 | 853 | BUG_ON(chan->priv->channel_type != METADATA_CHANNEL); |
d83004aa JD |
854 | |
855 | /* Protect the metadata cache with the sessions_mutex. */ | |
856 | mutex_lock(&sessions_mutex); | |
857 | _lttng_channel_destroy(chan); | |
858 | mutex_unlock(&sessions_mutex); | |
859 | } | |
860 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
861 | ||
862 | static | |
863 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
864 | { | |
865 | stream->finalized = 1; | |
866 | wake_up_interruptible(&stream->read_wait); | |
867 | } | |
868 | ||
756a020c MD |
869 | static |
870 | struct lttng_kernel_event_common *lttng_kernel_event_alloc(struct lttng_event_enabler_common *event_enabler) | |
871 | { | |
872 | struct lttng_kernel_abi_event *event_param = &event_enabler->event_param; | |
873 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; | |
874 | ||
875 | switch (event_enabler->enabler_type) { | |
876 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
877 | { | |
878 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
879 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
880 | struct lttng_kernel_event_recorder *event_recorder; | |
881 | struct lttng_kernel_event_recorder_private *event_recorder_priv; | |
882 | struct lttng_kernel_channel_buffer *chan = event_recorder_enabler->chan; | |
883 | ||
884 | event_recorder = kmem_cache_zalloc(event_recorder_cache, GFP_KERNEL); | |
885 | if (!event_recorder) | |
886 | return NULL; | |
887 | event_recorder_priv = kmem_cache_zalloc(event_recorder_private_cache, GFP_KERNEL); | |
888 | if (!event_recorder_priv) { | |
889 | kmem_cache_free(event_recorder_private_cache, event_recorder); | |
890 | return NULL; | |
891 | } | |
892 | event_recorder_priv->pub = event_recorder; | |
893 | event_recorder_priv->parent.pub = &event_recorder->parent; | |
894 | event_recorder->priv = event_recorder_priv; | |
895 | event_recorder->parent.priv = &event_recorder_priv->parent; | |
896 | ||
897 | event_recorder->parent.type = LTTNG_KERNEL_EVENT_TYPE_RECORDER; | |
898 | event_recorder->parent.run_filter = lttng_kernel_interpret_event_filter; | |
899 | event_recorder->priv->parent.instrumentation = itype; | |
900 | INIT_LIST_HEAD(&event_recorder->priv->parent.filter_bytecode_runtime_head); | |
901 | INIT_LIST_HEAD(&event_recorder->priv->parent.enablers_ref_head); | |
902 | ||
903 | event_recorder->chan = chan; | |
904 | event_recorder->priv->id = chan->priv->free_event_id++; | |
905 | return &event_recorder->parent; | |
906 | } | |
907 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
908 | { | |
909 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
910 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
911 | struct lttng_kernel_event_notifier *event_notifier; | |
912 | struct lttng_kernel_event_notifier_private *event_notifier_priv; | |
913 | ||
914 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
915 | if (!event_notifier) | |
916 | return NULL; | |
917 | event_notifier_priv = kmem_cache_zalloc(event_notifier_private_cache, GFP_KERNEL); | |
918 | if (!event_notifier_priv) { | |
919 | kmem_cache_free(event_notifier_private_cache, event_notifier); | |
920 | return NULL; | |
921 | } | |
922 | event_notifier_priv->pub = event_notifier; | |
923 | event_notifier_priv->parent.pub = &event_notifier->parent; | |
924 | event_notifier->priv = event_notifier_priv; | |
925 | event_notifier->parent.priv = &event_notifier_priv->parent; | |
926 | ||
927 | event_notifier->parent.type = LTTNG_KERNEL_EVENT_TYPE_NOTIFIER; | |
928 | event_notifier->parent.run_filter = lttng_kernel_interpret_event_filter; | |
929 | event_notifier->priv->parent.instrumentation = itype; | |
930 | event_notifier->priv->parent.user_token = event_enabler->user_token; | |
931 | INIT_LIST_HEAD(&event_notifier->priv->parent.filter_bytecode_runtime_head); | |
932 | INIT_LIST_HEAD(&event_notifier->priv->parent.enablers_ref_head); | |
933 | ||
934 | event_notifier->priv->group = event_notifier_enabler->group; | |
935 | event_notifier->priv->error_counter_index = event_notifier_enabler->error_counter_index; | |
936 | event_notifier->priv->num_captures = 0; | |
937 | event_notifier->notification_send = lttng_event_notifier_notification_send; | |
938 | INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); | |
939 | return &event_notifier->parent; | |
940 | } | |
941 | default: | |
942 | return NULL; | |
943 | } | |
944 | } | |
945 | ||
946 | static | |
947 | void lttng_kernel_event_free(struct lttng_kernel_event_common *event) | |
948 | { | |
949 | switch (event->type) { | |
950 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
951 | { | |
952 | struct lttng_kernel_event_recorder *event_recorder = | |
953 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
954 | ||
955 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); | |
956 | kmem_cache_free(event_recorder_cache, event_recorder); | |
957 | break; | |
958 | } | |
959 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
960 | { | |
961 | struct lttng_kernel_event_notifier *event_notifier = | |
962 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
963 | ||
964 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); | |
965 | kmem_cache_free(event_notifier_cache, event_notifier); | |
966 | break; | |
967 | } | |
968 | default: | |
969 | WARN_ON_ONCE(1); | |
970 | } | |
971 | } | |
a101fa10 | 972 | |
ccefc7ab MD |
973 | static |
974 | int lttng_kernel_event_notifier_clear_error_counter(struct lttng_kernel_event_common *event) | |
975 | { | |
976 | switch (event->type) { | |
977 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
978 | return 0; | |
979 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
980 | { | |
981 | struct lttng_kernel_event_notifier *event_notifier = | |
982 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
983 | struct lttng_counter *error_counter; | |
984 | struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group; | |
985 | size_t dimension_index[1]; | |
986 | int ret; | |
987 | ||
988 | /* | |
989 | * Clear the error counter bucket. The sessiond keeps track of which | |
990 | * bucket is currently in use. We trust it. The session lock | |
991 | * synchronizes against concurrent creation of the error | |
992 | * counter. | |
993 | */ | |
994 | error_counter = event_notifier_group->error_counter; | |
995 | if (!error_counter) | |
996 | return 0; | |
997 | /* | |
998 | * Check that the index is within the boundary of the counter. | |
999 | */ | |
1000 | if (event_notifier->priv->error_counter_index >= event_notifier_group->error_counter_len) { | |
1001 | printk(KERN_INFO "LTTng: event_notifier: Error counter index out-of-bound: counter-len=%zu, index=%llu\n", | |
1002 | event_notifier_group->error_counter_len, event_notifier->priv->error_counter_index); | |
1003 | return -EINVAL; | |
1004 | } | |
1005 | ||
1006 | dimension_index[0] = event_notifier->priv->error_counter_index; | |
1007 | ret = error_counter->ops->counter_clear(error_counter->counter, dimension_index); | |
1008 | if (ret) { | |
1009 | printk(KERN_INFO "LTTng: event_notifier: Unable to clear error counter bucket %llu\n", | |
1010 | event_notifier->priv->error_counter_index); | |
1011 | return -EINVAL; | |
1012 | } | |
1013 | return 0; | |
1014 | } | |
1015 | default: | |
1016 | return -EINVAL; | |
1017 | } | |
1018 | } | |
1019 | ||
e5382b6d MD |
1020 | /* |
1021 | * Supports event creation while tracing session is active. | |
3c997079 | 1022 | * Needs to be called with sessions mutex held. |
e5382b6d | 1023 | */ |
83006ee0 | 1024 | static |
1ae083ba | 1025 | struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_recorder_enabler *event_enabler, |
def1e304 | 1026 | const struct lttng_kernel_event_desc *event_desc) |
4e3c1b9b | 1027 | { |
0def9170 | 1028 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent); |
19b98250 | 1029 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(&event_enabler->parent); |
def1e304 | 1030 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
5b9817ae | 1031 | struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param; |
def1e304 | 1032 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; |
19bef247 | 1033 | struct lttng_kernel_event_common_private *event_priv; |
756a020c | 1034 | struct lttng_kernel_event_common *event; |
756a020c | 1035 | struct lttng_kernel_event_recorder *event_recorder; |
3c997079 MD |
1036 | const char *event_name; |
1037 | struct hlist_head *head; | |
3d084699 | 1038 | int ret; |
4e3c1b9b | 1039 | |
f7d06400 | 1040 | if (chan->priv->free_event_id == -1U) { |
4cf0bf51 | 1041 | ret = -EMFILE; |
e5382b6d | 1042 | goto full; |
abc0446a | 1043 | } |
3c997079 MD |
1044 | |
1045 | switch (itype) { | |
606828e4 | 1046 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1047 | event_name = event_desc->event_name; |
3c997079 | 1048 | break; |
b4a75708 | 1049 | |
c190d76e MJ |
1050 | case LTTNG_KERNEL_ABI_KPROBE: |
1051 | lttng_fallthrough; | |
1052 | case LTTNG_KERNEL_ABI_UPROBE: | |
1053 | lttng_fallthrough; | |
1054 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1055 | lttng_fallthrough; | |
606828e4 | 1056 | case LTTNG_KERNEL_ABI_SYSCALL: |
3c997079 MD |
1057 | event_name = event_param->name; |
1058 | break; | |
b4a75708 | 1059 | |
c190d76e MJ |
1060 | case LTTNG_KERNEL_ABI_FUNCTION: |
1061 | lttng_fallthrough; | |
1062 | case LTTNG_KERNEL_ABI_NOOP: | |
1063 | lttng_fallthrough; | |
3c997079 MD |
1064 | default: |
1065 | WARN_ON_ONCE(1); | |
1066 | ret = -EINVAL; | |
1067 | goto type_error; | |
1068 | } | |
4a11ef1c | 1069 | |
0def9170 | 1070 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 | 1071 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
0d223dc6 | 1072 | if (lttng_event_enabler_event_name_match_event(&event_enabler->parent, event_name, event_priv->pub)) { |
3c997079 MD |
1073 | ret = -EEXIST; |
1074 | goto exist; | |
abc0446a MD |
1075 | } |
1076 | } | |
3c997079 | 1077 | |
756a020c MD |
1078 | event = lttng_kernel_event_alloc(&event_enabler->parent); |
1079 | if (!event) { | |
4cf0bf51 | 1080 | ret = -ENOMEM; |
756a020c | 1081 | goto alloc_error; |
abc0446a | 1082 | } |
756a020c | 1083 | event_recorder = container_of(event, struct lttng_kernel_event_recorder, parent); |
3c997079 MD |
1084 | |
1085 | switch (itype) { | |
606828e4 | 1086 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
3c997079 | 1087 | /* Event will be enabled by enabler sync. */ |
7cd0f696 MD |
1088 | event->enabled = 0; |
1089 | event->priv->registered = 0; | |
1090 | event->priv->desc = lttng_event_desc_get(event_name); | |
1091 | if (!event->priv->desc) { | |
4cf0bf51 | 1092 | ret = -ENOENT; |
d3dbe23c | 1093 | goto register_error; |
abc0446a | 1094 | } |
3c997079 MD |
1095 | /* Populate lttng_event structure before event registration. */ |
1096 | smp_wmb(); | |
baf20995 | 1097 | break; |
b4a75708 | 1098 | |
606828e4 | 1099 | case LTTNG_KERNEL_ABI_KPROBE: |
a0493bef MD |
1100 | /* |
1101 | * Needs to be explicitly enabled after creation, since | |
1102 | * we may want to apply filters. | |
1103 | */ | |
7cd0f696 MD |
1104 | event->enabled = 0; |
1105 | event->priv->registered = 1; | |
3c997079 MD |
1106 | /* |
1107 | * Populate lttng_event structure before event | |
1108 | * registration. | |
1109 | */ | |
1110 | smp_wmb(); | |
8bf17deb | 1111 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
1112 | event_param->u.kprobe.symbol_name, |
1113 | event_param->u.kprobe.offset, | |
1114 | event_param->u.kprobe.addr, | |
7cd0f696 | 1115 | event); |
abc0446a | 1116 | if (ret) { |
4cf0bf51 | 1117 | ret = -EINVAL; |
d6d808f3 | 1118 | goto register_error; |
abc0446a | 1119 | } |
7cd0f696 | 1120 | ret = try_module_get(event->priv->desc->owner); |
edeb3137 | 1121 | WARN_ON_ONCE(!ret); |
d6d808f3 | 1122 | break; |
b4a75708 | 1123 | |
606828e4 | 1124 | case LTTNG_KERNEL_ABI_KRETPROBE: |
7371f44c | 1125 | { |
756a020c | 1126 | struct lttng_kernel_event_common *event_return; |
a67ba386 | 1127 | struct lttng_kernel_event_recorder *event_recorder_return; |
7371f44c MD |
1128 | |
1129 | /* kretprobe defines 2 events */ | |
a0493bef MD |
1130 | /* |
1131 | * Needs to be explicitly enabled after creation, since | |
1132 | * we may want to apply filters. | |
1133 | */ | |
756a020c MD |
1134 | event->enabled = 0; |
1135 | event->priv->registered = 1; | |
a67ba386 | 1136 | |
756a020c MD |
1137 | event_return = lttng_kernel_event_alloc(&event_enabler->parent); |
1138 | if (!event) { | |
a67ba386 | 1139 | ret = -ENOMEM; |
756a020c | 1140 | goto alloc_error; |
a67ba386 | 1141 | } |
756a020c MD |
1142 | event_recorder_return = container_of(event_return, struct lttng_kernel_event_recorder, parent); |
1143 | ||
1144 | event_return->enabled = 0; | |
1145 | event_return->priv->registered = 1; | |
1146 | ||
7371f44c | 1147 | /* |
a90917c3 | 1148 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
1149 | */ |
1150 | smp_wmb(); | |
3c997079 | 1151 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
1152 | event_param->u.kretprobe.symbol_name, |
1153 | event_param->u.kretprobe.offset, | |
1154 | event_param->u.kretprobe.addr, | |
756a020c | 1155 | event, event_return); |
7371f44c | 1156 | if (ret) { |
756a020c | 1157 | lttng_kernel_event_free(event_return); |
4cf0bf51 | 1158 | ret = -EINVAL; |
7371f44c MD |
1159 | goto register_error; |
1160 | } | |
1161 | /* Take 2 refs on the module: one per event. */ | |
756a020c | 1162 | ret = try_module_get(event->priv->desc->owner); |
7371f44c | 1163 | WARN_ON_ONCE(!ret); |
756a020c | 1164 | ret = try_module_get(event_return->priv->desc->owner); |
7371f44c | 1165 | WARN_ON_ONCE(!ret); |
756a020c | 1166 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder_return); |
abc0446a | 1167 | WARN_ON_ONCE(ret > 0); |
7371f44c | 1168 | if (ret) { |
756a020c | 1169 | lttng_kernel_event_free(event_return); |
7cd0f696 MD |
1170 | module_put(event_return->priv->desc->owner); |
1171 | module_put(event->priv->desc->owner); | |
7371f44c MD |
1172 | goto statedump_error; |
1173 | } | |
19b98250 | 1174 | list_add(&event_return->priv->node, event_list_head); |
7371f44c MD |
1175 | break; |
1176 | } | |
b4a75708 | 1177 | |
606828e4 | 1178 | case LTTNG_KERNEL_ABI_SYSCALL: |
a0493bef MD |
1179 | /* |
1180 | * Needs to be explicitly enabled after creation, since | |
1181 | * we may want to apply filters. | |
1182 | */ | |
7cd0f696 MD |
1183 | event->enabled = 0; |
1184 | event->priv->registered = 0; | |
1185 | event->priv->desc = event_desc; | |
badfe9f5 | 1186 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1187 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1188 | ret = -EINVAL; |
1189 | goto register_error; | |
606828e4 | 1190 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
7cd0f696 | 1191 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
badfe9f5 | 1192 | break; |
606828e4 | 1193 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
7cd0f696 | 1194 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
badfe9f5 MD |
1195 | break; |
1196 | } | |
1197 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1198 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1199 | ret = -EINVAL; |
1200 | goto register_error; | |
606828e4 | 1201 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
7cd0f696 | 1202 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
badfe9f5 | 1203 | break; |
606828e4 | 1204 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
7cd0f696 | 1205 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
badfe9f5 MD |
1206 | break; |
1207 | } | |
7cd0f696 | 1208 | if (!event->priv->desc) { |
4cf0bf51 | 1209 | ret = -EINVAL; |
259b6cb3 | 1210 | goto register_error; |
abc0446a | 1211 | } |
1ec65de1 | 1212 | break; |
b4a75708 | 1213 | |
606828e4 | 1214 | case LTTNG_KERNEL_ABI_UPROBE: |
a344f64b FD |
1215 | /* |
1216 | * Needs to be explicitly enabled after creation, since | |
1217 | * we may want to apply filters. | |
1218 | */ | |
7cd0f696 MD |
1219 | event->enabled = 0; |
1220 | event->priv->registered = 1; | |
3aed4dca | 1221 | |
a344f64b FD |
1222 | /* |
1223 | * Populate lttng_event structure before event | |
1224 | * registration. | |
1225 | */ | |
1226 | smp_wmb(); | |
149b9a9d | 1227 | |
83b802dc | 1228 | ret = lttng_uprobes_register_event(event_param->name, |
56377c91 | 1229 | event_param->u.uprobe.fd, |
7cd0f696 | 1230 | event); |
149b9a9d YB |
1231 | if (ret) |
1232 | goto register_error; | |
7cd0f696 | 1233 | ret = try_module_get(event->priv->desc->owner); |
149b9a9d YB |
1234 | WARN_ON_ONCE(!ret); |
1235 | break; | |
b4a75708 | 1236 | |
c190d76e MJ |
1237 | case LTTNG_KERNEL_ABI_FUNCTION: |
1238 | lttng_fallthrough; | |
1239 | case LTTNG_KERNEL_ABI_NOOP: | |
1240 | lttng_fallthrough; | |
baf20995 MD |
1241 | default: |
1242 | WARN_ON_ONCE(1); | |
4cf0bf51 | 1243 | ret = -EINVAL; |
df07930b | 1244 | goto register_error; |
baf20995 | 1245 | } |
f7d06400 | 1246 | ret = _lttng_event_metadata_statedump(chan->parent.session, chan, event_recorder); |
abc0446a MD |
1247 | WARN_ON_ONCE(ret > 0); |
1248 | if (ret) { | |
c099397a | 1249 | goto statedump_error; |
abc0446a | 1250 | } |
7cd0f696 | 1251 | hlist_add_head(&event->priv->hlist_node, head); |
19b98250 | 1252 | list_add(&event->priv->node, event_list_head); |
a67ba386 | 1253 | return event_recorder; |
4e3c1b9b | 1254 | |
c099397a | 1255 | statedump_error: |
259b6cb3 | 1256 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 1257 | register_error: |
756a020c MD |
1258 | lttng_kernel_event_free(event); |
1259 | alloc_error: | |
4e3c1b9b | 1260 | exist: |
3c997079 | 1261 | type_error: |
e5382b6d | 1262 | full: |
4cf0bf51 | 1263 | return ERR_PTR(ret); |
4e3c1b9b MD |
1264 | } |
1265 | ||
83006ee0 MD |
1266 | static |
1267 | struct lttng_kernel_event_notifier *_lttng_kernel_event_notifier_create(struct lttng_event_notifier_enabler *event_enabler, | |
1bbb5b2d | 1268 | const struct lttng_kernel_event_desc *event_desc) |
dffef45d | 1269 | { |
0def9170 | 1270 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_enabler->parent); |
19b98250 | 1271 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(&event_enabler->parent); |
1bbb5b2d | 1272 | struct lttng_kernel_abi_event *event_param = &event_enabler->parent.event_param; |
1bbb5b2d | 1273 | enum lttng_kernel_abi_instrumentation itype = event_param->instrumentation; |
19bef247 | 1274 | struct lttng_kernel_event_common_private *event_priv; |
756a020c | 1275 | struct lttng_kernel_event_common *event; |
756a020c | 1276 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
1277 | const char *event_name; |
1278 | struct hlist_head *head; | |
1279 | int ret; | |
1280 | ||
1281 | switch (itype) { | |
606828e4 | 1282 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1283 | event_name = event_desc->event_name; |
b01155ba | 1284 | break; |
b4a75708 | 1285 | |
c190d76e MJ |
1286 | case LTTNG_KERNEL_ABI_KPROBE: |
1287 | lttng_fallthrough; | |
1288 | case LTTNG_KERNEL_ABI_UPROBE: | |
1289 | lttng_fallthrough; | |
606828e4 | 1290 | case LTTNG_KERNEL_ABI_SYSCALL: |
1bbb5b2d | 1291 | event_name = event_param->name; |
2b16f0c9 | 1292 | break; |
b4a75708 | 1293 | |
c190d76e MJ |
1294 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1295 | lttng_fallthrough; | |
1296 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1297 | lttng_fallthrough; | |
1298 | case LTTNG_KERNEL_ABI_NOOP: | |
1299 | lttng_fallthrough; | |
dffef45d FD |
1300 | default: |
1301 | WARN_ON_ONCE(1); | |
1302 | ret = -EINVAL; | |
1303 | goto type_error; | |
1304 | } | |
1305 | ||
0def9170 | 1306 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, event_name); |
19bef247 | 1307 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
0d223dc6 | 1308 | if (lttng_event_enabler_event_name_match_event(&event_enabler->parent, event_name, event_priv->pub)) { |
dffef45d FD |
1309 | ret = -EEXIST; |
1310 | goto exist; | |
1311 | } | |
1312 | } | |
1313 | ||
756a020c MD |
1314 | event = lttng_kernel_event_alloc(&event_enabler->parent); |
1315 | if (!event) { | |
a67ba386 | 1316 | ret = -ENOMEM; |
756a020c | 1317 | goto alloc_error; |
a67ba386 | 1318 | } |
756a020c | 1319 | event_notifier = container_of(event, struct lttng_kernel_event_notifier, parent); |
dffef45d FD |
1320 | |
1321 | switch (itype) { | |
606828e4 | 1322 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
dffef45d | 1323 | /* Event will be enabled by enabler sync. */ |
7cd0f696 MD |
1324 | event->enabled = 0; |
1325 | event->priv->registered = 0; | |
1326 | event->priv->desc = lttng_event_desc_get(event_name); | |
1327 | if (!event->priv->desc) { | |
dffef45d FD |
1328 | ret = -ENOENT; |
1329 | goto register_error; | |
1330 | } | |
1331 | /* Populate lttng_event_notifier structure before event registration. */ | |
1332 | smp_wmb(); | |
1333 | break; | |
b4a75708 | 1334 | |
606828e4 | 1335 | case LTTNG_KERNEL_ABI_KPROBE: |
2b16f0c9 FD |
1336 | /* |
1337 | * Needs to be explicitly enabled after creation, since | |
1338 | * we may want to apply filters. | |
1339 | */ | |
7cd0f696 MD |
1340 | event->enabled = 0; |
1341 | event->priv->registered = 1; | |
2b16f0c9 FD |
1342 | /* |
1343 | * Populate lttng_event_notifier structure before event | |
1344 | * registration. | |
1345 | */ | |
1346 | smp_wmb(); | |
1bbb5b2d MD |
1347 | ret = lttng_kprobes_register_event(event_param->u.kprobe.symbol_name, |
1348 | event_param->u.kprobe.symbol_name, | |
1349 | event_param->u.kprobe.offset, | |
1350 | event_param->u.kprobe.addr, | |
7cd0f696 | 1351 | event); |
2b16f0c9 FD |
1352 | if (ret) { |
1353 | ret = -EINVAL; | |
1354 | goto register_error; | |
1355 | } | |
7cd0f696 | 1356 | ret = try_module_get(event->priv->desc->owner); |
2b16f0c9 FD |
1357 | WARN_ON_ONCE(!ret); |
1358 | break; | |
b4a75708 | 1359 | |
606828e4 | 1360 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 FD |
1361 | /* |
1362 | * Needs to be explicitly enabled after creation, since | |
1363 | * we may want to apply filters. | |
1364 | */ | |
7cd0f696 MD |
1365 | event->enabled = 0; |
1366 | event->priv->registered = 0; | |
1367 | event->priv->desc = event_desc; | |
1bbb5b2d | 1368 | switch (event_param->u.syscall.entryexit) { |
606828e4 | 1369 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
8a8ac9a8 FD |
1370 | ret = -EINVAL; |
1371 | goto register_error; | |
606828e4 | 1372 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
7cd0f696 | 1373 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; |
8a8ac9a8 | 1374 | break; |
606828e4 | 1375 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
7cd0f696 | 1376 | event->priv->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; |
8a8ac9a8 FD |
1377 | break; |
1378 | } | |
1bbb5b2d | 1379 | switch (event_param->u.syscall.abi) { |
606828e4 | 1380 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
8a8ac9a8 FD |
1381 | ret = -EINVAL; |
1382 | goto register_error; | |
606828e4 | 1383 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
7cd0f696 | 1384 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; |
8a8ac9a8 | 1385 | break; |
606828e4 | 1386 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
7cd0f696 | 1387 | event->priv->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; |
8a8ac9a8 FD |
1388 | break; |
1389 | } | |
1390 | ||
7cd0f696 | 1391 | if (!event->priv->desc) { |
8a8ac9a8 FD |
1392 | ret = -EINVAL; |
1393 | goto register_error; | |
1394 | } | |
1395 | break; | |
b4a75708 | 1396 | |
606828e4 | 1397 | case LTTNG_KERNEL_ABI_UPROBE: |
9de67196 FD |
1398 | /* |
1399 | * Needs to be explicitly enabled after creation, since | |
1400 | * we may want to apply filters. | |
1401 | */ | |
7cd0f696 MD |
1402 | event->enabled = 0; |
1403 | event->priv->registered = 1; | |
9de67196 FD |
1404 | |
1405 | /* | |
1406 | * Populate lttng_event_notifier structure before | |
1407 | * event_notifier registration. | |
1408 | */ | |
1409 | smp_wmb(); | |
1410 | ||
1bbb5b2d MD |
1411 | ret = lttng_uprobes_register_event(event_param->name, |
1412 | event_param->u.uprobe.fd, | |
7cd0f696 | 1413 | event); |
9de67196 FD |
1414 | if (ret) |
1415 | goto register_error; | |
7cd0f696 | 1416 | ret = try_module_get(event->priv->desc->owner); |
9de67196 FD |
1417 | WARN_ON_ONCE(!ret); |
1418 | break; | |
b4a75708 | 1419 | |
c190d76e MJ |
1420 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1421 | lttng_fallthrough; | |
1422 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1423 | lttng_fallthrough; | |
1424 | case LTTNG_KERNEL_ABI_NOOP: | |
1425 | lttng_fallthrough; | |
dffef45d FD |
1426 | default: |
1427 | WARN_ON_ONCE(1); | |
1428 | ret = -EINVAL; | |
1429 | goto register_error; | |
1430 | } | |
1431 | ||
19b98250 | 1432 | list_add(&event->priv->node, event_list_head); |
7cd0f696 | 1433 | hlist_add_head(&event->priv->hlist_node, head); |
99f52fcc | 1434 | |
ccefc7ab MD |
1435 | ret = lttng_kernel_event_notifier_clear_error_counter(event); |
1436 | if (ret) | |
1437 | goto register_error; | |
dffef45d FD |
1438 | return event_notifier; |
1439 | ||
1440 | register_error: | |
756a020c MD |
1441 | lttng_kernel_event_free(event); |
1442 | alloc_error: | |
dffef45d FD |
1443 | exist: |
1444 | type_error: | |
1445 | return ERR_PTR(ret); | |
1446 | } | |
1447 | ||
83006ee0 MD |
1448 | struct lttng_kernel_event_common *_lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, |
1449 | const struct lttng_kernel_event_desc *event_desc) | |
1450 | { | |
1451 | switch (event_enabler->enabler_type) { | |
1452 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
1453 | { | |
1454 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
1455 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
1456 | struct lttng_kernel_event_recorder *event_recorder; | |
1457 | ||
1458 | event_recorder = _lttng_kernel_event_recorder_create(event_recorder_enabler, event_desc); | |
1459 | if (!event_recorder) | |
1460 | return NULL; | |
1461 | return &event_recorder->parent; | |
1462 | } | |
1463 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
1464 | { | |
1465 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
1466 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
1467 | struct lttng_kernel_event_notifier *event_notifier; | |
1468 | ||
1469 | event_notifier = _lttng_kernel_event_notifier_create(event_notifier_enabler, event_desc); | |
1470 | if (!event_notifier) | |
1471 | return NULL; | |
1472 | return &event_notifier->parent; | |
1473 | } | |
1474 | default: | |
1475 | return NULL; | |
1476 | } | |
1477 | } | |
1478 | ||
1479 | struct lttng_kernel_event_common *lttng_kernel_event_create(struct lttng_event_enabler_common *event_enabler, | |
1480 | const struct lttng_kernel_event_desc *event_desc) | |
1481 | { | |
1482 | struct lttng_kernel_event_common *event; | |
1483 | ||
1484 | mutex_lock(&sessions_mutex); | |
1485 | event = _lttng_kernel_event_create(event_enabler, event_desc); | |
1486 | mutex_unlock(&sessions_mutex); | |
1487 | return event; | |
1488 | } | |
1489 | ||
1490 | ||
1491 | ||
99f52fcc FD |
1492 | int lttng_kernel_counter_read(struct lttng_counter *counter, |
1493 | const size_t *dim_indexes, int32_t cpu, | |
1494 | int64_t *val, bool *overflow, bool *underflow) | |
1495 | { | |
1496 | return counter->ops->counter_read(counter->counter, dim_indexes, | |
1497 | cpu, val, overflow, underflow); | |
1498 | } | |
1499 | ||
1500 | int lttng_kernel_counter_aggregate(struct lttng_counter *counter, | |
1501 | const size_t *dim_indexes, int64_t *val, | |
1502 | bool *overflow, bool *underflow) | |
1503 | { | |
1504 | return counter->ops->counter_aggregate(counter->counter, dim_indexes, | |
1505 | val, overflow, underflow); | |
1506 | } | |
1507 | ||
1508 | int lttng_kernel_counter_clear(struct lttng_counter *counter, | |
1509 | const size_t *dim_indexes) | |
1510 | { | |
1511 | return counter->ops->counter_clear(counter->counter, dim_indexes); | |
1512 | } | |
1513 | ||
3c997079 MD |
1514 | /* Only used for tracepoints for now. */ |
1515 | static | |
0c851fa0 | 1516 | void register_event(struct lttng_kernel_event_common *event) |
3c997079 | 1517 | { |
437d5aa5 | 1518 | const struct lttng_kernel_event_desc *desc; |
f127e61e | 1519 | int ret = -EINVAL; |
3c997079 | 1520 | |
0c851fa0 | 1521 | if (event->priv->registered) |
3c997079 | 1522 | return; |
4ecb5ad5 | 1523 | |
0c851fa0 MD |
1524 | desc = event->priv->desc; |
1525 | switch (event->priv->instrumentation) { | |
606828e4 | 1526 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 1527 | ret = lttng_wrapper_tracepoint_probe_register(desc->event_kname, |
6c8c025b | 1528 | desc->tp_class->probe_callback, |
0c851fa0 | 1529 | event); |
4ecb5ad5 | 1530 | break; |
b4a75708 | 1531 | |
606828e4 | 1532 | case LTTNG_KERNEL_ABI_SYSCALL: |
0c851fa0 | 1533 | ret = lttng_syscall_filter_enable_event(event); |
4ecb5ad5 | 1534 | break; |
b4a75708 | 1535 | |
c190d76e MJ |
1536 | case LTTNG_KERNEL_ABI_KPROBE: |
1537 | lttng_fallthrough; | |
1538 | case LTTNG_KERNEL_ABI_UPROBE: | |
4ecb5ad5 | 1539 | ret = 0; |
f0bcc14c | 1540 | break; |
0c851fa0 MD |
1541 | |
1542 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1543 | switch (event->type) { | |
1544 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1545 | ret = 0; | |
1546 | break; | |
1547 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1548 | WARN_ON_ONCE(1); | |
1549 | break; | |
1550 | } | |
4ecb5ad5 | 1551 | break; |
b4a75708 | 1552 | |
c190d76e MJ |
1553 | case LTTNG_KERNEL_ABI_FUNCTION: |
1554 | lttng_fallthrough; | |
1555 | case LTTNG_KERNEL_ABI_NOOP: | |
1556 | lttng_fallthrough; | |
4ecb5ad5 MD |
1557 | default: |
1558 | WARN_ON_ONCE(1); | |
1559 | } | |
3c997079 | 1560 | if (!ret) |
0c851fa0 | 1561 | event->priv->registered = 1; |
3c997079 MD |
1562 | } |
1563 | ||
f0bcc14c | 1564 | int _lttng_event_unregister(struct lttng_kernel_event_common *event) |
4e3c1b9b | 1565 | { |
f0bcc14c | 1566 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
437d5aa5 | 1567 | const struct lttng_kernel_event_desc *desc; |
11b5a3c2 MD |
1568 | int ret = -EINVAL; |
1569 | ||
a67ba386 | 1570 | if (!event_priv->registered) |
3c997079 MD |
1571 | return 0; |
1572 | ||
a67ba386 MD |
1573 | desc = event_priv->desc; |
1574 | switch (event_priv->instrumentation) { | |
606828e4 | 1575 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
a67ba386 | 1576 | ret = lttng_wrapper_tracepoint_probe_unregister(event_priv->desc->event_kname, |
6c8c025b | 1577 | event_priv->desc->tp_class->probe_callback, |
f0bcc14c | 1578 | event); |
baf20995 | 1579 | break; |
b4a75708 | 1580 | |
606828e4 | 1581 | case LTTNG_KERNEL_ABI_KPROBE: |
f0bcc14c | 1582 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1583 | ret = 0; |
1584 | break; | |
b4a75708 | 1585 | |
606828e4 | 1586 | case LTTNG_KERNEL_ABI_KRETPROBE: |
f0bcc14c MD |
1587 | switch (event->type) { |
1588 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1589 | lttng_kretprobes_unregister(event); | |
1590 | ret = 0; | |
1591 | break; | |
1592 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1593 | WARN_ON_ONCE(1); | |
1594 | break; | |
1595 | } | |
7371f44c | 1596 | break; |
b4a75708 | 1597 | |
606828e4 | 1598 | case LTTNG_KERNEL_ABI_SYSCALL: |
f0bcc14c | 1599 | ret = lttng_syscall_filter_disable_event(event); |
4ecb5ad5 | 1600 | break; |
b4a75708 | 1601 | |
606828e4 | 1602 | case LTTNG_KERNEL_ABI_NOOP: |
f0bcc14c MD |
1603 | switch (event->type) { |
1604 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1605 | ret = 0; | |
1606 | break; | |
1607 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1608 | WARN_ON_ONCE(1); | |
1609 | break; | |
1610 | } | |
259b6cb3 | 1611 | break; |
b4a75708 | 1612 | |
606828e4 | 1613 | case LTTNG_KERNEL_ABI_UPROBE: |
f0bcc14c | 1614 | lttng_uprobes_unregister_event(event); |
149b9a9d YB |
1615 | ret = 0; |
1616 | break; | |
b4a75708 | 1617 | |
c190d76e MJ |
1618 | case LTTNG_KERNEL_ABI_FUNCTION: |
1619 | lttng_fallthrough; | |
baf20995 MD |
1620 | default: |
1621 | WARN_ON_ONCE(1); | |
1622 | } | |
3c997079 | 1623 | if (!ret) |
a67ba386 | 1624 | event_priv->registered = 0; |
dda6a249 MD |
1625 | return ret; |
1626 | } | |
1627 | ||
1628 | /* | |
1629 | * Only used internally at session destruction. | |
1630 | */ | |
be066e6c | 1631 | static |
0648898e | 1632 | void _lttng_event_destroy(struct lttng_kernel_event_common *event) |
dda6a249 | 1633 | { |
0648898e | 1634 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
966ad253 MD |
1635 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; |
1636 | ||
0648898e MD |
1637 | lttng_free_event_filter_runtime(event); |
1638 | /* Free event enabler refs */ | |
1639 | list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1640 | &event_priv->enablers_ref_head, node) | |
1641 | kfree(enabler_ref); | |
b4a75708 | 1642 | |
0648898e MD |
1643 | switch (event->type) { |
1644 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1645 | { | |
1646 | struct lttng_kernel_event_recorder *event_recorder = | |
1647 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
b4a75708 | 1648 | |
0648898e MD |
1649 | switch (event_priv->instrumentation) { |
1650 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1651 | lttng_event_desc_put(event_priv->desc); | |
1652 | break; | |
b4a75708 | 1653 | |
0648898e MD |
1654 | case LTTNG_KERNEL_ABI_KPROBE: |
1655 | module_put(event_priv->desc->owner); | |
6a35e5bd | 1656 | lttng_kprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1657 | break; |
b4a75708 | 1658 | |
0648898e MD |
1659 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1660 | module_put(event_priv->desc->owner); | |
eb6b47db | 1661 | lttng_kretprobes_destroy_private(&event_recorder->parent); |
0648898e | 1662 | break; |
b4a75708 | 1663 | |
0648898e MD |
1664 | case LTTNG_KERNEL_ABI_SYSCALL: |
1665 | break; | |
4e3c1b9b | 1666 | |
0648898e MD |
1667 | case LTTNG_KERNEL_ABI_UPROBE: |
1668 | module_put(event_priv->desc->owner); | |
17806c46 | 1669 | lttng_uprobes_destroy_event_private(&event_recorder->parent); |
0648898e | 1670 | break; |
3ef5cc03 | 1671 | |
c190d76e MJ |
1672 | case LTTNG_KERNEL_ABI_FUNCTION: |
1673 | lttng_fallthrough; | |
1674 | case LTTNG_KERNEL_ABI_NOOP: | |
1675 | lttng_fallthrough; | |
0648898e MD |
1676 | default: |
1677 | WARN_ON_ONCE(1); | |
1678 | } | |
f237aef8 | 1679 | list_del(&event_recorder->priv->parent.node); |
0648898e MD |
1680 | kmem_cache_free(event_recorder_private_cache, event_recorder->priv); |
1681 | kmem_cache_free(event_recorder_cache, event_recorder); | |
b01155ba | 1682 | break; |
0648898e MD |
1683 | } |
1684 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1685 | { | |
1686 | struct lttng_kernel_event_notifier *event_notifier = | |
1687 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
b4a75708 | 1688 | |
0648898e MD |
1689 | switch (event_notifier->priv->parent.instrumentation) { |
1690 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
1691 | lttng_event_desc_put(event_notifier->priv->parent.desc); | |
1692 | break; | |
b4a75708 | 1693 | |
0648898e MD |
1694 | case LTTNG_KERNEL_ABI_KPROBE: |
1695 | module_put(event_notifier->priv->parent.desc->owner); | |
6a35e5bd | 1696 | lttng_kprobes_destroy_event_private(&event_notifier->parent); |
0648898e | 1697 | break; |
b4a75708 | 1698 | |
0648898e MD |
1699 | case LTTNG_KERNEL_ABI_SYSCALL: |
1700 | break; | |
b4a75708 | 1701 | |
0648898e MD |
1702 | case LTTNG_KERNEL_ABI_UPROBE: |
1703 | module_put(event_notifier->priv->parent.desc->owner); | |
17806c46 | 1704 | lttng_uprobes_destroy_event_private(&event_notifier->parent); |
0648898e MD |
1705 | break; |
1706 | ||
c190d76e MJ |
1707 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1708 | lttng_fallthrough; | |
1709 | case LTTNG_KERNEL_ABI_FUNCTION: | |
1710 | lttng_fallthrough; | |
1711 | case LTTNG_KERNEL_ABI_NOOP: | |
1712 | lttng_fallthrough; | |
0648898e MD |
1713 | default: |
1714 | WARN_ON_ONCE(1); | |
1715 | } | |
f237aef8 | 1716 | list_del(&event_notifier->priv->parent.node); |
0648898e MD |
1717 | kmem_cache_free(event_notifier_private_cache, event_notifier->priv); |
1718 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1719 | break; | |
1720 | } | |
dffef45d FD |
1721 | default: |
1722 | WARN_ON_ONCE(1); | |
1723 | } | |
dffef45d FD |
1724 | } |
1725 | ||
8c0393c3 | 1726 | struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, |
d1f652f8 | 1727 | enum tracker_type tracker_type) |
e0130fab | 1728 | { |
d1f652f8 MD |
1729 | switch (tracker_type) { |
1730 | case TRACKER_PID: | |
1731 | return &session->pid_tracker; | |
1732 | case TRACKER_VPID: | |
1733 | return &session->vpid_tracker; | |
1734 | case TRACKER_UID: | |
1735 | return &session->uid_tracker; | |
1736 | case TRACKER_VUID: | |
1737 | return &session->vuid_tracker; | |
1738 | case TRACKER_GID: | |
1739 | return &session->gid_tracker; | |
1740 | case TRACKER_VGID: | |
1741 | return &session->vgid_tracker; | |
1742 | default: | |
1743 | WARN_ON_ONCE(1); | |
1744 | return NULL; | |
1745 | } | |
1746 | } | |
1747 | ||
8cdc1a81 | 1748 | int lttng_session_track_id(struct lttng_kernel_session *session, |
d1f652f8 MD |
1749 | enum tracker_type tracker_type, int id) |
1750 | { | |
8c0393c3 | 1751 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1752 | int ret; |
1753 | ||
d1f652f8 MD |
1754 | tracker = get_tracker(session, tracker_type); |
1755 | if (!tracker) | |
1756 | return -EINVAL; | |
1757 | if (id < -1) | |
e0130fab MD |
1758 | return -EINVAL; |
1759 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1760 | if (id == -1) { |
1761 | /* track all ids: destroy tracker. */ | |
1762 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1763 | ret = 0; |
1764 | } else { | |
d1f652f8 | 1765 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1766 | } |
e0130fab MD |
1767 | mutex_unlock(&sessions_mutex); |
1768 | return ret; | |
1769 | } | |
1770 | ||
8cdc1a81 | 1771 | int lttng_session_untrack_id(struct lttng_kernel_session *session, |
d1f652f8 | 1772 | enum tracker_type tracker_type, int id) |
e0130fab | 1773 | { |
8c0393c3 | 1774 | struct lttng_kernel_id_tracker *tracker; |
e0130fab MD |
1775 | int ret; |
1776 | ||
d1f652f8 MD |
1777 | tracker = get_tracker(session, tracker_type); |
1778 | if (!tracker) | |
1779 | return -EINVAL; | |
1780 | if (id < -1) | |
e0130fab MD |
1781 | return -EINVAL; |
1782 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1783 | if (id == -1) { |
1784 | /* untrack all ids: replace by empty tracker. */ | |
1785 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1786 | } else { |
d1f652f8 | 1787 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1788 | } |
e0130fab MD |
1789 | mutex_unlock(&sessions_mutex); |
1790 | return ret; | |
1791 | } | |
1792 | ||
7e6f9ef6 | 1793 | static |
d1f652f8 | 1794 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1795 | { |
8c0393c3 MD |
1796 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1797 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1798 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1799 | int iter = 0, i; |
1800 | ||
1801 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1802 | if (id_tracker_p) { |
1803 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1804 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1805 | |
f934e302 | 1806 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1807 | if (iter++ >= *pos) |
1808 | return e; | |
1809 | } | |
1810 | } | |
1811 | } else { | |
d1f652f8 | 1812 | /* ID tracker disabled. */ |
7e6f9ef6 | 1813 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1814 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1815 | } |
1816 | iter++; | |
1817 | } | |
1818 | /* End of list */ | |
1819 | return NULL; | |
1820 | } | |
1821 | ||
1822 | /* Called with sessions_mutex held. */ | |
1823 | static | |
d1f652f8 | 1824 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1825 | { |
8c0393c3 MD |
1826 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1827 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1828 | struct lttng_id_hash_node *e; |
7e6f9ef6 MD |
1829 | int iter = 0, i; |
1830 | ||
1831 | (*ppos)++; | |
d1f652f8 MD |
1832 | if (id_tracker_p) { |
1833 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1834 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1835 | |
f934e302 | 1836 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1837 | if (iter++ >= *ppos) |
1838 | return e; | |
1839 | } | |
1840 | } | |
1841 | } else { | |
d1f652f8 | 1842 | /* ID tracker disabled. */ |
7e6f9ef6 | 1843 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1844 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1845 | iter++; |
1846 | } | |
1847 | ||
1848 | /* End of list */ | |
1849 | return NULL; | |
1850 | } | |
1851 | ||
1852 | static | |
d1f652f8 | 1853 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1854 | { |
1855 | mutex_unlock(&sessions_mutex); | |
1856 | } | |
1857 | ||
1858 | static | |
d1f652f8 | 1859 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1860 | { |
8c0393c3 MD |
1861 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
1862 | struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
d1f652f8 | 1863 | int id; |
7e6f9ef6 | 1864 | |
d1f652f8 | 1865 | if (p == id_tracker_p) { |
7e6f9ef6 | 1866 | /* Tracker disabled. */ |
d1f652f8 | 1867 | id = -1; |
7e6f9ef6 | 1868 | } else { |
d1f652f8 | 1869 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1870 | |
d1f652f8 MD |
1871 | id = lttng_id_tracker_get_node_id(e); |
1872 | } | |
8c0393c3 | 1873 | switch (id_tracker->priv->tracker_type) { |
d1f652f8 MD |
1874 | case TRACKER_PID: |
1875 | seq_printf(m, "process { pid = %d; };\n", id); | |
1876 | break; | |
1877 | case TRACKER_VPID: | |
1878 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1879 | break; | |
1880 | case TRACKER_UID: | |
1881 | seq_printf(m, "user { uid = %d; };\n", id); | |
1882 | break; | |
1883 | case TRACKER_VUID: | |
1884 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1885 | break; | |
1886 | case TRACKER_GID: | |
1887 | seq_printf(m, "group { gid = %d; };\n", id); | |
1888 | break; | |
1889 | case TRACKER_VGID: | |
1890 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1891 | break; | |
1892 | default: | |
1893 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1894 | } |
7e6f9ef6 MD |
1895 | return 0; |
1896 | } | |
1897 | ||
1898 | static | |
d1f652f8 MD |
1899 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1900 | .start = id_list_start, | |
1901 | .next = id_list_next, | |
1902 | .stop = id_list_stop, | |
1903 | .show = id_list_show, | |
7e6f9ef6 MD |
1904 | }; |
1905 | ||
1906 | static | |
d1f652f8 | 1907 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1908 | { |
d1f652f8 | 1909 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1910 | } |
1911 | ||
1912 | static | |
d1f652f8 | 1913 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1914 | { |
1915 | struct seq_file *m = file->private_data; | |
8c0393c3 | 1916 | struct lttng_kernel_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1917 | int ret; |
1918 | ||
d1f652f8 | 1919 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1920 | ret = seq_release(inode, file); |
d1f652f8 | 1921 | if (!ret) |
8c0393c3 | 1922 | fput(id_tracker->priv->session->priv->file); |
7e6f9ef6 MD |
1923 | return ret; |
1924 | } | |
1925 | ||
d1f652f8 | 1926 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1927 | .owner = THIS_MODULE, |
d1f652f8 | 1928 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1929 | .read = seq_read, |
1930 | .llseek = seq_lseek, | |
d1f652f8 | 1931 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1932 | }; |
1933 | ||
8cdc1a81 | 1934 | int lttng_session_list_tracker_ids(struct lttng_kernel_session *session, |
d1f652f8 | 1935 | enum tracker_type tracker_type) |
7e6f9ef6 | 1936 | { |
d1f652f8 | 1937 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1938 | struct seq_file *m; |
1939 | int file_fd, ret; | |
1940 | ||
1941 | file_fd = lttng_get_unused_fd(); | |
1942 | if (file_fd < 0) { | |
1943 | ret = file_fd; | |
1944 | goto fd_error; | |
1945 | } | |
1946 | ||
d1f652f8 MD |
1947 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1948 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1949 | NULL, O_RDWR); |
d1f652f8 MD |
1950 | if (IS_ERR(tracker_ids_list_file)) { |
1951 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1952 | goto file_error; |
1953 | } | |
8cdc1a81 | 1954 | if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) { |
98d7281c | 1955 | ret = -EOVERFLOW; |
9c1f4643 MD |
1956 | goto refcount_error; |
1957 | } | |
d1f652f8 | 1958 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1959 | if (ret < 0) |
1960 | goto open_error; | |
d1f652f8 MD |
1961 | m = tracker_ids_list_file->private_data; |
1962 | ||
1963 | m->private = get_tracker(session, tracker_type); | |
1964 | BUG_ON(!m->private); | |
1965 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1966 | |
1967 | return file_fd; | |
1968 | ||
1969 | open_error: | |
8cdc1a81 | 1970 | atomic_long_dec(&session->priv->file->f_count); |
9c1f4643 | 1971 | refcount_error: |
d1f652f8 | 1972 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1973 | file_error: |
1974 | put_unused_fd(file_fd); | |
1975 | fd_error: | |
1976 | return ret; | |
1977 | } | |
1978 | ||
3c997079 MD |
1979 | /* |
1980 | * Enabler management. | |
1981 | */ | |
1982 | static | |
4993071a PP |
1983 | int lttng_match_enabler_star_glob(const char *desc_name, |
1984 | const char *pattern) | |
3c997079 | 1985 | { |
cbc19040 MD |
1986 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1987 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1988 | return 0; |
1989 | return 1; | |
1990 | } | |
1991 | ||
1992 | static | |
4ecb5ad5 MD |
1993 | int lttng_match_enabler_name(const char *desc_name, |
1994 | const char *name) | |
3c997079 | 1995 | { |
4ecb5ad5 | 1996 | if (strcmp(desc_name, name)) |
3c997079 MD |
1997 | return 0; |
1998 | return 1; | |
1999 | } | |
2000 | ||
8bff0fc3 MD |
2001 | static |
2002 | int lttng_desc_match_enabler_check(const struct lttng_kernel_event_desc *desc, | |
8d554755 | 2003 | struct lttng_event_enabler_common *enabler) |
3c997079 | 2004 | { |
4ecb5ad5 | 2005 | const char *desc_name, *enabler_name; |
badfe9f5 | 2006 | bool compat = false, entry = false; |
4ecb5ad5 MD |
2007 | |
2008 | enabler_name = enabler->event_param.name; | |
2009 | switch (enabler->event_param.instrumentation) { | |
606828e4 | 2010 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
437d5aa5 | 2011 | desc_name = desc->event_name; |
3b861b22 FD |
2012 | switch (enabler->format_type) { |
2013 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2014 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2015 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2016 | return lttng_match_enabler_name(desc_name, enabler_name); |
2017 | default: | |
2018 | return -EINVAL; | |
2019 | } | |
4ecb5ad5 | 2020 | break; |
b4a75708 | 2021 | |
606828e4 | 2022 | case LTTNG_KERNEL_ABI_SYSCALL: |
437d5aa5 | 2023 | desc_name = desc->event_name; |
badfe9f5 | 2024 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 2025 | desc_name += strlen("compat_"); |
badfe9f5 MD |
2026 | compat = true; |
2027 | } | |
4ecb5ad5 MD |
2028 | if (!strncmp(desc_name, "syscall_exit_", |
2029 | strlen("syscall_exit_"))) { | |
2030 | desc_name += strlen("syscall_exit_"); | |
2031 | } else if (!strncmp(desc_name, "syscall_entry_", | |
2032 | strlen("syscall_entry_"))) { | |
2033 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 2034 | entry = true; |
4ecb5ad5 MD |
2035 | } else { |
2036 | WARN_ON_ONCE(1); | |
2037 | return -EINVAL; | |
2038 | } | |
badfe9f5 | 2039 | switch (enabler->event_param.u.syscall.entryexit) { |
606828e4 | 2040 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 | 2041 | break; |
606828e4 | 2042 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
badfe9f5 MD |
2043 | if (!entry) |
2044 | return 0; | |
2045 | break; | |
606828e4 | 2046 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: |
badfe9f5 MD |
2047 | if (entry) |
2048 | return 0; | |
2049 | break; | |
2050 | default: | |
2051 | return -EINVAL; | |
2052 | } | |
2053 | switch (enabler->event_param.u.syscall.abi) { | |
606828e4 | 2054 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 | 2055 | break; |
606828e4 | 2056 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE: |
badfe9f5 MD |
2057 | if (compat) |
2058 | return 0; | |
2059 | break; | |
606828e4 | 2060 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT: |
badfe9f5 MD |
2061 | if (!compat) |
2062 | return 0; | |
2063 | break; | |
2064 | default: | |
2065 | return -EINVAL; | |
2066 | } | |
2067 | switch (enabler->event_param.u.syscall.match) { | |
606828e4 | 2068 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
3b861b22 FD |
2069 | switch (enabler->format_type) { |
2070 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 2071 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 2072 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
2073 | return lttng_match_enabler_name(desc_name, enabler_name); |
2074 | default: | |
2075 | return -EINVAL; | |
2076 | } | |
2077 | break; | |
606828e4 | 2078 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NR: |
badfe9f5 MD |
2079 | return -EINVAL; /* Not implemented. */ |
2080 | default: | |
2081 | return -EINVAL; | |
2082 | } | |
4ecb5ad5 | 2083 | break; |
b4a75708 | 2084 | |
4ecb5ad5 MD |
2085 | default: |
2086 | WARN_ON_ONCE(1); | |
2087 | return -EINVAL; | |
2088 | } | |
3c997079 MD |
2089 | } |
2090 | ||
8bff0fc3 MD |
2091 | bool lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc, |
2092 | struct lttng_event_enabler_common *enabler) | |
2093 | { | |
2094 | int ret; | |
2095 | ||
2096 | ret = lttng_desc_match_enabler_check(desc, enabler); | |
2097 | if (ret < 0) { | |
2098 | WARN_ON_ONCE(1); | |
2099 | return false; | |
2100 | } | |
2101 | return ret; | |
2102 | } | |
2103 | ||
5c6ec66a MD |
2104 | bool lttng_event_enabler_match_event(struct lttng_event_enabler_common *event_enabler, |
2105 | struct lttng_kernel_event_common *event) | |
3c997079 | 2106 | { |
5c6ec66a MD |
2107 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
2108 | return false; | |
b2bc0bc8 | 2109 | |
5c6ec66a MD |
2110 | switch (event_enabler->enabler_type) { |
2111 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2112 | { | |
2113 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2114 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2115 | struct lttng_kernel_event_recorder *event_recorder = | |
2116 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2117 | ||
2118 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
2119 | && event_recorder->chan == event_recorder_enabler->chan) | |
2120 | return true; | |
2121 | else | |
2122 | return false; | |
2123 | } | |
2124 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2125 | { | |
2126 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2127 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2128 | struct lttng_kernel_event_notifier *event_notifier = | |
2129 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2130 | ||
2131 | if (lttng_desc_match_enabler(event->priv->desc, event_enabler) | |
2132 | && event_notifier->priv->group == event_notifier_enabler->group | |
2133 | && event->priv->user_token == event_enabler->user_token) | |
2134 | return true; | |
2135 | else | |
2136 | return false; | |
2137 | } | |
2138 | default: | |
2139 | WARN_ON_ONCE(1); | |
2140 | return false; | |
2141 | } | |
3c997079 MD |
2142 | } |
2143 | ||
5c6ec66a MD |
2144 | bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler, |
2145 | const struct lttng_kernel_event_desc *desc, | |
2146 | struct lttng_kernel_event_common *event) | |
b01155ba | 2147 | { |
5c6ec66a MD |
2148 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) |
2149 | return false; | |
b01155ba | 2150 | |
5c6ec66a MD |
2151 | switch (event_enabler->enabler_type) { |
2152 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2153 | { | |
2154 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2155 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2156 | struct lttng_kernel_event_recorder *event_recorder = | |
2157 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2158 | ||
2159 | if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan) | |
2160 | return true; | |
2161 | else | |
2162 | return false; | |
2163 | } | |
2164 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2165 | { | |
2166 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2167 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2168 | struct lttng_kernel_event_notifier *event_notifier = | |
2169 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2170 | ||
2171 | if (event->priv->desc == desc | |
2172 | && event_notifier->priv->group == event_notifier_enabler->group | |
2173 | && event->priv->user_token == event_enabler->user_token) | |
2174 | return true; | |
2175 | else | |
2176 | return false; | |
2177 | } | |
2178 | default: | |
2179 | WARN_ON_ONCE(1); | |
2180 | return false; | |
2181 | } | |
b01155ba FD |
2182 | } |
2183 | ||
0d223dc6 MD |
2184 | bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler, |
2185 | const char *event_name, | |
2186 | struct lttng_kernel_event_common *event) | |
2187 | { | |
2188 | if (event_enabler->event_param.instrumentation != event->priv->instrumentation) | |
2189 | return false; | |
2190 | ||
2191 | switch (event_enabler->enabler_type) { | |
2192 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2193 | { | |
2194 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2195 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2196 | struct lttng_kernel_event_recorder *event_recorder = | |
2197 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2198 | ||
2199 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2200 | && event_recorder->chan == event_recorder_enabler->chan) | |
2201 | return true; | |
2202 | else | |
2203 | return false; | |
2204 | } | |
2205 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2206 | { | |
2207 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2208 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2209 | struct lttng_kernel_event_notifier *event_notifier = | |
2210 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2211 | ||
2212 | if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1) | |
2213 | && event_notifier->priv->group == event_notifier_enabler->group | |
2214 | && event->priv->user_token == event_enabler->user_token) | |
2215 | return true; | |
2216 | else | |
2217 | return false; | |
2218 | } | |
2219 | default: | |
2220 | WARN_ON_ONCE(1); | |
2221 | return false; | |
2222 | } | |
2223 | } | |
2224 | ||
3c997079 | 2225 | static |
b2bc0bc8 FD |
2226 | struct lttng_enabler_ref *lttng_enabler_ref( |
2227 | struct list_head *enablers_ref_list, | |
8d554755 | 2228 | struct lttng_event_enabler_common *enabler) |
3c997079 MD |
2229 | { |
2230 | struct lttng_enabler_ref *enabler_ref; | |
2231 | ||
b2bc0bc8 | 2232 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
2233 | if (enabler_ref->ref == enabler) |
2234 | return enabler_ref; | |
2235 | } | |
2236 | return NULL; | |
2237 | } | |
2238 | ||
3c997079 | 2239 | static |
c8e14380 | 2240 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2241 | { |
c8e14380 | 2242 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
437d5aa5 MD |
2243 | struct lttng_kernel_probe_desc *probe_desc; |
2244 | const struct lttng_kernel_event_desc *desc; | |
3c997079 | 2245 | struct list_head *probe_list; |
c8e14380 | 2246 | int i; |
3c997079 MD |
2247 | |
2248 | probe_list = lttng_get_probe_list_head(); | |
2249 | /* | |
2250 | * For each probe event, if we find that a probe event matches | |
2251 | * our enabler, create an associated lttng_event if not | |
2252 | * already present. | |
2253 | */ | |
2254 | list_for_each_entry(probe_desc, probe_list, head) { | |
2255 | for (i = 0; i < probe_desc->nr_events; i++) { | |
2256 | int found = 0; | |
2257 | struct hlist_head *head; | |
83006ee0 | 2258 | struct lttng_kernel_event_common *event; |
19bef247 | 2259 | struct lttng_kernel_event_common_private *event_priv; |
3c997079 MD |
2260 | |
2261 | desc = probe_desc->event_desc[i]; | |
c8e14380 | 2262 | if (!lttng_desc_match_enabler(desc, event_enabler)) |
3c997079 | 2263 | continue; |
3c997079 MD |
2264 | |
2265 | /* | |
2266 | * Check if already created. | |
2267 | */ | |
0def9170 | 2268 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 2269 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
c8e14380 | 2270 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) |
3c997079 MD |
2271 | found = 1; |
2272 | } | |
2273 | if (found) | |
2274 | continue; | |
2275 | ||
2276 | /* | |
83006ee0 | 2277 | * We need to create an event for this event probe. |
3c997079 | 2278 | */ |
c8e14380 | 2279 | event = _lttng_kernel_event_create(event_enabler, desc); |
83006ee0 | 2280 | if (!event) { |
5a15f70c | 2281 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
437d5aa5 | 2282 | probe_desc->event_desc[i]->event_name); |
3c997079 MD |
2283 | } |
2284 | } | |
2285 | } | |
2286 | } | |
2287 | ||
33a39a3c | 2288 | static |
053554ae | 2289 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c MD |
2290 | { |
2291 | int ret; | |
2292 | ||
053554ae | 2293 | ret = lttng_syscalls_register_event(event_enabler); |
8a8ac9a8 | 2294 | WARN_ON_ONCE(ret); |
8a8ac9a8 FD |
2295 | } |
2296 | ||
33a39a3c | 2297 | /* |
8839618b | 2298 | * Create event if it is missing and present in the list of tracepoint probes. |
33a39a3c MD |
2299 | * Should be called with sessions mutex held. |
2300 | */ | |
2301 | static | |
8839618b | 2302 | void lttng_create_event_if_missing(struct lttng_event_enabler_common *event_enabler) |
33a39a3c | 2303 | { |
8839618b | 2304 | switch (event_enabler->event_param.instrumentation) { |
606828e4 | 2305 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
8839618b | 2306 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c | 2307 | break; |
b4a75708 | 2308 | |
606828e4 | 2309 | case LTTNG_KERNEL_ABI_SYSCALL: |
8839618b | 2310 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c | 2311 | break; |
b4a75708 | 2312 | |
33a39a3c MD |
2313 | default: |
2314 | WARN_ON_ONCE(1); | |
2315 | break; | |
2316 | } | |
2317 | } | |
2318 | ||
d619fae9 MD |
2319 | static |
2320 | void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler, | |
2321 | struct lttng_kernel_event_common *event) | |
2322 | { | |
2323 | /* Link filter bytecodes if not linked yet. */ | |
2324 | lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx, | |
2325 | &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head); | |
2326 | } | |
2327 | ||
1e06b222 MD |
2328 | static |
2329 | void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler, | |
2330 | struct lttng_kernel_event_common *event) | |
2331 | { | |
2332 | switch (event_enabler->enabler_type) { | |
2333 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2334 | break; | |
2335 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2336 | { | |
2337 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2338 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2339 | struct lttng_kernel_event_notifier *event_notifier = | |
2340 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2341 | ||
2342 | /* Link capture bytecodes if not linked yet. */ | |
2343 | lttng_enabler_link_bytecode(event->priv->desc, | |
2344 | lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head, | |
2345 | &event_notifier_enabler->capture_bytecode_head); | |
2346 | event_notifier->priv->num_captures = event_notifier_enabler->num_captures; | |
2347 | break; | |
2348 | } | |
2349 | default: | |
2350 | WARN_ON_ONCE(1); | |
2351 | } | |
2352 | } | |
2353 | ||
3c997079 | 2354 | /* |
b2bc0bc8 | 2355 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
2356 | * and add backward reference from the event to the enabler. |
2357 | * Should be called with sessions mutex held. | |
2358 | */ | |
2359 | static | |
3622cd47 | 2360 | int lttng_event_enabler_ref_events(struct lttng_event_enabler_common *event_enabler) |
3c997079 | 2361 | { |
3622cd47 MD |
2362 | struct list_head *event_list_head = lttng_get_event_list_head_from_enabler(event_enabler); |
2363 | struct lttng_kernel_event_common_private *event_priv; | |
3c997079 | 2364 | |
3622cd47 | 2365 | lttng_syscall_table_set_wildcard_all(event_enabler); |
badfe9f5 | 2366 | |
3c997079 | 2367 | /* First ensure that probe events are created for this enabler. */ |
3622cd47 | 2368 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 2369 | |
3622cd47 MD |
2370 | /* Link the created event with its associated enabler. */ |
2371 | list_for_each_entry(event_priv, event_list_head, node) { | |
2372 | struct lttng_kernel_event_common *event = event_priv->pub; | |
b01155ba FD |
2373 | struct lttng_enabler_ref *enabler_ref; |
2374 | ||
3622cd47 | 2375 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
b01155ba FD |
2376 | continue; |
2377 | ||
3622cd47 | 2378 | enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, event_enabler); |
b01155ba FD |
2379 | if (!enabler_ref) { |
2380 | /* | |
2381 | * If no backward ref, create it. | |
2382 | * Add backward ref from event_notifier to enabler. | |
2383 | */ | |
2384 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
2385 | if (!enabler_ref) | |
2386 | return -ENOMEM; | |
2387 | ||
3622cd47 MD |
2388 | enabler_ref->ref = event_enabler; |
2389 | list_add(&enabler_ref->node, &event_priv->enablers_ref_head); | |
b01155ba FD |
2390 | } |
2391 | ||
3622cd47 MD |
2392 | lttng_event_enabler_init_event_filter(event_enabler, event); |
2393 | lttng_event_enabler_init_event_capture(event_enabler, event); | |
b01155ba FD |
2394 | } |
2395 | return 0; | |
2396 | } | |
2397 | ||
3c997079 MD |
2398 | /* |
2399 | * Called at module load: connect the probe on all enablers matching | |
2400 | * this event. | |
2401 | * Called with sessions lock held. | |
2402 | */ | |
2403 | int lttng_fix_pending_events(void) | |
2404 | { | |
8cdc1a81 | 2405 | struct lttng_kernel_session_private *session_priv; |
3c997079 | 2406 | |
8cdc1a81 MD |
2407 | list_for_each_entry(session_priv, &sessions, list) |
2408 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
3c997079 MD |
2409 | return 0; |
2410 | } | |
2411 | ||
b01155ba FD |
2412 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2413 | struct lttng_event_notifier_group *event_notifier_group) | |
2414 | { | |
09710b83 | 2415 | struct lttng_event_enabler_common *event_enabler; |
b01155ba | 2416 | |
09710b83 MD |
2417 | list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) { |
2418 | if (event_enabler->enabled) | |
b01155ba FD |
2419 | return true; |
2420 | } | |
2421 | return false; | |
2422 | } | |
2423 | ||
2424 | bool lttng_event_notifier_active(void) | |
2425 | { | |
2426 | struct lttng_event_notifier_group *event_notifier_group; | |
2427 | ||
2428 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2429 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2430 | return true; | |
2431 | } | |
2432 | return false; | |
2433 | } | |
2434 | ||
2435 | int lttng_fix_pending_event_notifiers(void) | |
2436 | { | |
2437 | struct lttng_event_notifier_group *event_notifier_group; | |
2438 | ||
2439 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2440 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2441 | return 0; | |
2442 | } | |
2443 | ||
1ae083ba | 2444 | struct lttng_event_recorder_enabler *lttng_event_recorder_enabler_create( |
b2bc0bc8 | 2445 | enum lttng_enabler_format_type format_type, |
606828e4 | 2446 | struct lttng_kernel_abi_event *event_param, |
f7d06400 | 2447 | struct lttng_kernel_channel_buffer *chan) |
3c997079 | 2448 | { |
1ae083ba | 2449 | struct lttng_event_recorder_enabler *event_enabler; |
3c997079 | 2450 | |
b2bc0bc8 FD |
2451 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2452 | if (!event_enabler) | |
3c997079 | 2453 | return NULL; |
0bb716a8 | 2454 | event_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_RECORDER; |
5b9817ae MD |
2455 | event_enabler->parent.format_type = format_type; |
2456 | INIT_LIST_HEAD(&event_enabler->parent.filter_bytecode_head); | |
2457 | memcpy(&event_enabler->parent.event_param, event_param, | |
2458 | sizeof(event_enabler->parent.event_param)); | |
b2bc0bc8 | 2459 | event_enabler->chan = chan; |
3c997079 | 2460 | /* ctx left NULL */ |
5b9817ae | 2461 | event_enabler->parent.enabled = 0; |
def1e304 MD |
2462 | return event_enabler; |
2463 | } | |
2464 | ||
2465 | void lttng_event_enabler_session_add(struct lttng_kernel_session *session, | |
1ae083ba | 2466 | struct lttng_event_recorder_enabler *event_enabler) |
def1e304 | 2467 | { |
3c997079 | 2468 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2469 | list_add(&event_enabler->parent.node, &session->priv->enablers_head); |
2470 | event_enabler->parent.published = true; | |
def1e304 | 2471 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 | 2472 | mutex_unlock(&sessions_mutex); |
3c997079 MD |
2473 | } |
2474 | ||
7b25ab0e | 2475 | int lttng_event_enabler_enable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2476 | { |
2477 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2478 | event_enabler->enabled = 1; |
2479 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2480 | mutex_unlock(&sessions_mutex); |
2481 | return 0; | |
2482 | } | |
2483 | ||
7b25ab0e | 2484 | int lttng_event_enabler_disable(struct lttng_event_enabler_common *event_enabler) |
3c997079 MD |
2485 | { |
2486 | mutex_lock(&sessions_mutex); | |
7b25ab0e MD |
2487 | event_enabler->enabled = 0; |
2488 | lttng_event_enabler_sync(event_enabler); | |
3c997079 MD |
2489 | mutex_unlock(&sessions_mutex); |
2490 | return 0; | |
2491 | } | |
2492 | ||
b2bc0bc8 | 2493 | static |
8d554755 | 2494 | int lttng_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *enabler, |
606828e4 | 2495 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
07dfc1d0 | 2496 | { |
d64ca521 | 2497 | struct lttng_kernel_bytecode_node *bytecode_node; |
07dfc1d0 MD |
2498 | uint32_t bytecode_len; |
2499 | int ret; | |
2500 | ||
2501 | ret = get_user(bytecode_len, &bytecode->len); | |
2502 | if (ret) | |
2503 | return ret; | |
52cfcdf3 | 2504 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, |
07dfc1d0 MD |
2505 | GFP_KERNEL); |
2506 | if (!bytecode_node) | |
2507 | return -ENOMEM; | |
2508 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2509 | sizeof(*bytecode) + bytecode_len); | |
2510 | if (ret) | |
2511 | goto error_free; | |
b2bc0bc8 | 2512 | |
8a445457 | 2513 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_FILTER; |
07dfc1d0 MD |
2514 | bytecode_node->enabler = enabler; |
2515 | /* Enforce length based on allocated size */ | |
2516 | bytecode_node->bc.len = bytecode_len; | |
2517 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2518 | |
07dfc1d0 MD |
2519 | return 0; |
2520 | ||
2521 | error_free: | |
52cfcdf3 | 2522 | lttng_kvfree(bytecode_node); |
07dfc1d0 MD |
2523 | return ret; |
2524 | } | |
2525 | ||
6048044f | 2526 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler_common *event_enabler, |
606828e4 | 2527 | struct lttng_kernel_abi_filter_bytecode __user *bytecode) |
b2bc0bc8 FD |
2528 | { |
2529 | int ret; | |
6048044f | 2530 | ret = lttng_enabler_attach_filter_bytecode(event_enabler, bytecode); |
b2bc0bc8 FD |
2531 | if (ret) |
2532 | goto error; | |
7b25ab0e | 2533 | lttng_event_enabler_sync(event_enabler); |
b2bc0bc8 FD |
2534 | return 0; |
2535 | ||
2536 | error: | |
2537 | return ret; | |
2538 | } | |
2539 | ||
e2d5dbc7 | 2540 | int lttng_event_add_callsite(struct lttng_kernel_event_common *event, |
606828e4 | 2541 | struct lttng_kernel_abi_event_callsite __user *callsite) |
3aed4dca FD |
2542 | { |
2543 | ||
e2d5dbc7 | 2544 | switch (event->priv->instrumentation) { |
606828e4 | 2545 | case LTTNG_KERNEL_ABI_UPROBE: |
e2d5dbc7 | 2546 | return lttng_uprobes_event_add_callsite(event, callsite); |
3aed4dca FD |
2547 | default: |
2548 | return -EINVAL; | |
2549 | } | |
2550 | } | |
2551 | ||
3c997079 | 2552 | static |
8d554755 | 2553 | void lttng_enabler_destroy(struct lttng_event_enabler_common *enabler) |
3c997079 | 2554 | { |
d64ca521 | 2555 | struct lttng_kernel_bytecode_node *filter_node, *tmp_filter_node; |
07dfc1d0 MD |
2556 | |
2557 | /* Destroy filter bytecode */ | |
2558 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2559 | &enabler->filter_bytecode_head, node) { | |
52cfcdf3 | 2560 | lttng_kvfree(filter_node); |
07dfc1d0 | 2561 | } |
b2bc0bc8 FD |
2562 | } |
2563 | ||
44b1abdc | 2564 | void lttng_event_enabler_destroy(struct lttng_event_enabler_common *event_enabler) |
b2bc0bc8 | 2565 | { |
09710b83 MD |
2566 | lttng_enabler_destroy(event_enabler); |
2567 | if (event_enabler->published) | |
2568 | list_del(&event_enabler->node); | |
2569 | ||
44b1abdc MD |
2570 | switch (event_enabler->enabler_type) { |
2571 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2572 | { | |
2573 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2574 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2575 | ||
44b1abdc MD |
2576 | kfree(event_recorder_enabler); |
2577 | break; | |
2578 | } | |
2579 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2580 | { | |
2581 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2582 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
07dfc1d0 | 2583 | |
44b1abdc MD |
2584 | kfree(event_notifier_enabler); |
2585 | break; | |
2586 | } | |
2587 | default: | |
2588 | WARN_ON_ONCE(1); | |
2589 | } | |
3c997079 MD |
2590 | } |
2591 | ||
dffef45d | 2592 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
dffef45d | 2593 | enum lttng_enabler_format_type format_type, |
1bbb5b2d MD |
2594 | struct lttng_kernel_abi_event_notifier *event_notifier_param, |
2595 | struct lttng_event_notifier_group *event_notifier_group) | |
dffef45d FD |
2596 | { |
2597 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2598 | ||
2599 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2600 | if (!event_notifier_enabler) | |
2601 | return NULL; | |
2602 | ||
0bb716a8 | 2603 | event_notifier_enabler->parent.enabler_type = LTTNG_EVENT_ENABLER_TYPE_NOTIFIER; |
5b9817ae MD |
2604 | event_notifier_enabler->parent.format_type = format_type; |
2605 | INIT_LIST_HEAD(&event_notifier_enabler->parent.filter_bytecode_head); | |
99d223ad FD |
2606 | INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
2607 | ||
99f52fcc | 2608 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
99d223ad | 2609 | event_notifier_enabler->num_captures = 0; |
dffef45d | 2610 | |
5b9817ae MD |
2611 | memcpy(&event_notifier_enabler->parent.event_param, &event_notifier_param->event, |
2612 | sizeof(event_notifier_enabler->parent.event_param)); | |
dffef45d | 2613 | |
5b9817ae MD |
2614 | event_notifier_enabler->parent.enabled = 0; |
2615 | event_notifier_enabler->parent.user_token = event_notifier_param->event.token; | |
dffef45d | 2616 | event_notifier_enabler->group = event_notifier_group; |
1bbb5b2d MD |
2617 | return event_notifier_enabler; |
2618 | } | |
dffef45d | 2619 | |
1bbb5b2d MD |
2620 | void lttng_event_notifier_enabler_group_add(struct lttng_event_notifier_group *event_notifier_group, |
2621 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2622 | { | |
dffef45d | 2623 | mutex_lock(&sessions_mutex); |
09710b83 MD |
2624 | list_add(&event_notifier_enabler->parent.node, &event_notifier_enabler->group->enablers_head); |
2625 | event_notifier_enabler->parent.published = true; | |
b01155ba | 2626 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d | 2627 | mutex_unlock(&sessions_mutex); |
dffef45d FD |
2628 | } |
2629 | ||
2630 | int lttng_event_notifier_enabler_enable( | |
2631 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2632 | { | |
2633 | mutex_lock(&sessions_mutex); | |
2634 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2635 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2636 | mutex_unlock(&sessions_mutex); |
2637 | return 0; | |
2638 | } | |
2639 | ||
2640 | int lttng_event_notifier_enabler_disable( | |
2641 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2642 | { | |
2643 | mutex_lock(&sessions_mutex); | |
2644 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2645 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2646 | mutex_unlock(&sessions_mutex); |
2647 | return 0; | |
2648 | } | |
2649 | ||
99d223ad FD |
2650 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
2651 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
606828e4 | 2652 | struct lttng_kernel_abi_capture_bytecode __user *bytecode) |
99d223ad | 2653 | { |
d64ca521 | 2654 | struct lttng_kernel_bytecode_node *bytecode_node; |
8d554755 | 2655 | struct lttng_event_enabler_common *enabler = |
99d223ad FD |
2656 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
2657 | uint32_t bytecode_len; | |
2658 | int ret; | |
2659 | ||
2660 | ret = get_user(bytecode_len, &bytecode->len); | |
2661 | if (ret) | |
2662 | return ret; | |
2663 | ||
2664 | bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2665 | GFP_KERNEL); | |
2666 | if (!bytecode_node) | |
2667 | return -ENOMEM; | |
2668 | ||
2669 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2670 | sizeof(*bytecode) + bytecode_len); | |
2671 | if (ret) | |
2672 | goto error_free; | |
2673 | ||
8a445457 | 2674 | bytecode_node->type = LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE; |
99d223ad FD |
2675 | bytecode_node->enabler = enabler; |
2676 | ||
2677 | /* Enforce length based on allocated size */ | |
2678 | bytecode_node->bc.len = bytecode_len; | |
2679 | list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head); | |
2680 | ||
2681 | event_notifier_enabler->num_captures++; | |
2682 | ||
2683 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2684 | goto end; | |
2685 | ||
2686 | error_free: | |
2687 | lttng_kvfree(bytecode_node); | |
2688 | end: | |
2689 | return ret; | |
2690 | } | |
2691 | ||
cc5719b1 MD |
2692 | static |
2693 | void lttng_event_sync_filter_state(struct lttng_kernel_event_common *event) | |
2694 | { | |
2695 | int has_enablers_without_filter_bytecode = 0, nr_filters = 0; | |
2696 | struct lttng_kernel_bytecode_runtime *runtime; | |
2697 | struct lttng_enabler_ref *enabler_ref; | |
2698 | ||
2699 | /* Check if has enablers without bytecode enabled */ | |
2700 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2701 | if (enabler_ref->ref->enabled | |
2702 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2703 | has_enablers_without_filter_bytecode = 1; | |
2704 | break; | |
2705 | } | |
2706 | } | |
2707 | event->priv->has_enablers_without_filter_bytecode = has_enablers_without_filter_bytecode; | |
2708 | ||
2709 | /* Enable filters */ | |
2710 | list_for_each_entry(runtime, &event->priv->filter_bytecode_runtime_head, node) { | |
2711 | lttng_bytecode_sync_state(runtime); | |
2712 | nr_filters++; | |
2713 | } | |
2714 | WRITE_ONCE(event->eval_filter, !(has_enablers_without_filter_bytecode || !nr_filters)); | |
2715 | } | |
2716 | ||
2717 | static | |
2718 | void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event) | |
2719 | { | |
2720 | switch (event->type) { | |
2721 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2722 | break; | |
2723 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2724 | { | |
2725 | struct lttng_kernel_event_notifier *event_notifier = | |
2726 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
2727 | struct lttng_kernel_bytecode_runtime *runtime; | |
2728 | int nr_captures = 0; | |
2729 | ||
2730 | /* Enable captures */ | |
2731 | list_for_each_entry(runtime, &event_notifier->priv->capture_bytecode_runtime_head, node) { | |
2732 | lttng_bytecode_sync_state(runtime); | |
2733 | nr_captures++; | |
2734 | } | |
2735 | WRITE_ONCE(event_notifier->eval_capture, !!nr_captures); | |
2736 | break; | |
2737 | } | |
2738 | default: | |
2739 | WARN_ON_ONCE(1); | |
2740 | } | |
2741 | } | |
2742 | ||
a0c6ad2e MD |
2743 | static |
2744 | bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event) | |
2745 | { | |
2746 | struct lttng_enabler_ref *enabler_ref; | |
2747 | bool enabled = false; | |
2748 | ||
2749 | switch (event->priv->instrumentation) { | |
2750 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2751 | lttng_fallthrough; | |
2752 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2753 | /* Enable events */ | |
2754 | list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { | |
2755 | if (enabler_ref->ref->enabled) { | |
2756 | enabled = true; | |
2757 | break; | |
2758 | } | |
2759 | } | |
2760 | break; | |
2761 | default: | |
2762 | WARN_ON_ONCE(1); | |
2763 | return false; | |
2764 | } | |
2765 | ||
2766 | switch (event->type) { | |
2767 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
2768 | { | |
2769 | struct lttng_kernel_event_recorder *event_recorder = | |
2770 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
2771 | ||
2772 | /* | |
2773 | * Enabled state is based on union of enablers, with | |
2774 | * intersection of session and channel transient enable | |
2775 | * states. | |
2776 | */ | |
2777 | return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate; | |
2778 | } | |
2779 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
2780 | return enabled; | |
2781 | default: | |
2782 | WARN_ON_ONCE(1); | |
2783 | return false; | |
2784 | } | |
2785 | } | |
2786 | ||
2787 | static | |
2788 | bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event) | |
2789 | { | |
2790 | switch (event->priv->instrumentation) { | |
2791 | case LTTNG_KERNEL_ABI_TRACEPOINT: | |
2792 | lttng_fallthrough; | |
2793 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2794 | return true; | |
2795 | ||
2796 | default: | |
2797 | /* Not handled with lazy sync. */ | |
2798 | return false; | |
2799 | } | |
2800 | } | |
2801 | ||
3c997079 | 2802 | /* |
3c997079 MD |
2803 | * Should be called with sessions mutex held. |
2804 | */ | |
2805 | static | |
a0c6ad2e MD |
2806 | void lttng_sync_event_list(struct list_head *event_enabler_list, |
2807 | struct list_head *event_list) | |
3c997079 | 2808 | { |
a0c6ad2e | 2809 | struct lttng_kernel_event_common_private *event_priv; |
09710b83 | 2810 | struct lttng_event_enabler_common *event_enabler; |
3c997079 | 2811 | |
a0c6ad2e | 2812 | list_for_each_entry(event_enabler, event_enabler_list, node) |
09710b83 | 2813 | lttng_event_enabler_ref_events(event_enabler); |
a0c6ad2e | 2814 | |
3c997079 MD |
2815 | /* |
2816 | * For each event, if at least one of its enablers is enabled, | |
2817 | * and its channel and session transient states are enabled, we | |
2818 | * enable the event, else we disable it. | |
2819 | */ | |
a0c6ad2e MD |
2820 | list_for_each_entry(event_priv, event_list, node) { |
2821 | struct lttng_kernel_event_common *event = event_priv->pub; | |
2822 | bool enabled; | |
b4a75708 | 2823 | |
a0c6ad2e | 2824 | if (!lttng_event_is_lazy_sync(event)) |
3c997079 | 2825 | continue; |
3c997079 | 2826 | |
a0c6ad2e MD |
2827 | enabled = lttng_get_event_enabled_state(event); |
2828 | WRITE_ONCE(event->enabled, enabled); | |
3c997079 | 2829 | /* |
a0c6ad2e | 2830 | * Sync tracepoint registration with event enabled state. |
3c997079 MD |
2831 | */ |
2832 | if (enabled) { | |
a0c6ad2e | 2833 | register_event(event); |
3c997079 | 2834 | } else { |
a0c6ad2e | 2835 | _lttng_event_unregister(event); |
3c997079 | 2836 | } |
07dfc1d0 | 2837 | |
a0c6ad2e MD |
2838 | lttng_event_sync_filter_state(event); |
2839 | lttng_event_sync_capture_state(event); | |
3c997079 MD |
2840 | } |
2841 | } | |
2842 | ||
a0c6ad2e MD |
2843 | /* |
2844 | * lttng_session_sync_event_enablers should be called just before starting a | |
2845 | * session. | |
2846 | */ | |
2847 | static | |
2848 | void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) | |
2849 | { | |
2850 | lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events); | |
2851 | } | |
2852 | ||
3c997079 MD |
2853 | /* |
2854 | * Apply enablers to session events, adding events to session if need | |
2855 | * be. It is required after each modification applied to an active | |
2856 | * session, and right before session "start". | |
2857 | * "lazy" sync means we only sync if required. | |
2858 | * Should be called with sessions mutex held. | |
2859 | */ | |
2860 | static | |
8cdc1a81 | 2861 | void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session) |
3c997079 MD |
2862 | { |
2863 | /* We can skip if session is not active */ | |
2864 | if (!session->active) | |
2865 | return; | |
b2bc0bc8 | 2866 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2867 | } |
2868 | ||
b01155ba FD |
2869 | static |
2870 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2871 | { | |
a0c6ad2e | 2872 | lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head); |
b01155ba FD |
2873 | } |
2874 | ||
7b25ab0e MD |
2875 | static |
2876 | void lttng_event_enabler_sync(struct lttng_event_enabler_common *event_enabler) | |
2877 | { | |
2878 | switch (event_enabler->enabler_type) { | |
2879 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
2880 | { | |
2881 | struct lttng_event_recorder_enabler *event_recorder_enabler = | |
2882 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
2883 | lttng_session_lazy_sync_event_enablers(event_recorder_enabler->chan->parent.session); | |
2884 | break; | |
2885 | } | |
2886 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
2887 | { | |
2888 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
2889 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
2890 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
2891 | break; | |
2892 | } | |
2893 | default: | |
2894 | WARN_ON_ONCE(1); | |
2895 | } | |
2896 | } | |
2897 | ||
1ec3f75a | 2898 | /* |
d83004aa JD |
2899 | * Serialize at most one packet worth of metadata into a metadata |
2900 | * channel. | |
92d9f5e6 MD |
2901 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2902 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2903 | * allows us to do racy operations such as looking for remaining space left in | |
2904 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2905 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2906 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2907 | * Returns the number of bytes written in the channel, 0 if no data |
2908 | * was written and a negative value on error. | |
1ec3f75a | 2909 | */ |
b3b8072b | 2910 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
860c213b | 2911 | struct lttng_kernel_ring_buffer_channel *chan, bool *coherent) |
d83004aa | 2912 | { |
8a57ec02 | 2913 | struct lttng_kernel_ring_buffer_ctx ctx; |
d83004aa JD |
2914 | int ret = 0; |
2915 | size_t len, reserve_len; | |
2916 | ||
f613e3e6 | 2917 | /* |
92d9f5e6 MD |
2918 | * Ensure we support mutiple get_next / put sequences followed by |
2919 | * put_next. The metadata cache lock protects reading the metadata | |
2920 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2921 | * "flush" operations on the buffer invoked by different processes. | |
2922 | * Moreover, since the metadata cache memory can be reallocated, we | |
2923 | * need to have exclusive access against updates even though we only | |
2924 | * read it. | |
f613e3e6 | 2925 | */ |
92d9f5e6 | 2926 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2927 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2928 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2929 | goto end; |
f613e3e6 | 2930 | |
9616f0bf JD |
2931 | /* Metadata regenerated, change the version. */ |
2932 | if (stream->metadata_cache->version != stream->version) | |
2933 | stream->version = stream->metadata_cache->version; | |
2934 | ||
d83004aa | 2935 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2936 | stream->metadata_in; |
9de2c215 | 2937 | if (!len) |
de23d59d | 2938 | goto end; |
d83004aa | 2939 | reserve_len = min_t(size_t, |
4a399b76 | 2940 | stream->transport->ops.priv->packet_avail_size(chan), |
d83004aa | 2941 | len); |
a775608d | 2942 | lib_ring_buffer_ctx_init(&ctx, chan, reserve_len, |
b1199bd3 | 2943 | sizeof(char), NULL); |
d83004aa JD |
2944 | /* |
2945 | * If reservation failed, return an error to the caller. | |
2946 | */ | |
c2fb9c1c | 2947 | ret = stream->transport->ops.event_reserve(&ctx); |
d83004aa JD |
2948 | if (ret != 0) { |
2949 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2950 | stream->coherent = false; |
d83004aa JD |
2951 | goto end; |
2952 | } | |
b3b8072b | 2953 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2954 | stream->metadata_cache->data + stream->metadata_in, |
f5ffbd77 | 2955 | reserve_len, 1); |
b3b8072b | 2956 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2957 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2958 | if (reserve_len < len) |
8b97fd42 MD |
2959 | stream->coherent = false; |
2960 | else | |
2961 | stream->coherent = true; | |
d83004aa JD |
2962 | ret = reserve_len; |
2963 | ||
2964 | end: | |
8b97fd42 MD |
2965 | if (coherent) |
2966 | *coherent = stream->coherent; | |
92d9f5e6 | 2967 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2968 | return ret; |
2969 | } | |
2970 | ||
8b97fd42 | 2971 | static |
8cdc1a81 | 2972 | void lttng_metadata_begin(struct lttng_kernel_session *session) |
8b97fd42 | 2973 | { |
8cdc1a81 MD |
2974 | if (atomic_inc_return(&session->priv->metadata_cache->producing) == 1) |
2975 | mutex_lock(&session->priv->metadata_cache->lock); | |
8b97fd42 MD |
2976 | } |
2977 | ||
2978 | static | |
8cdc1a81 | 2979 | void lttng_metadata_end(struct lttng_kernel_session *session) |
8b97fd42 | 2980 | { |
8cdc1a81 MD |
2981 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
2982 | if (atomic_dec_return(&session->priv->metadata_cache->producing) == 0) { | |
3e75e2a7 MD |
2983 | struct lttng_metadata_stream *stream; |
2984 | ||
8cdc1a81 | 2985 | list_for_each_entry(stream, &session->priv->metadata_cache->metadata_stream, list) |
3e75e2a7 | 2986 | wake_up_interruptible(&stream->read_wait); |
8cdc1a81 | 2987 | mutex_unlock(&session->priv->metadata_cache->lock); |
3e75e2a7 | 2988 | } |
8b97fd42 MD |
2989 | } |
2990 | ||
d83004aa JD |
2991 | /* |
2992 | * Write the metadata to the metadata cache. | |
2993 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2994 | * The metadata cache lock protects us from concurrent read access from |
2995 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2996 | * The content of the printf is printed as a single atomic metadata |
2997 | * transaction. | |
d83004aa | 2998 | */ |
8cdc1a81 | 2999 | int lttng_metadata_printf(struct lttng_kernel_session *session, |
c099397a MD |
3000 | const char *fmt, ...) |
3001 | { | |
c099397a | 3002 | char *str; |
d83004aa | 3003 | size_t len; |
c099397a MD |
3004 | va_list ap; |
3005 | ||
585e5dcc | 3006 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
3007 | |
3008 | va_start(ap, fmt); | |
3009 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
3010 | va_end(ap); | |
3011 | if (!str) | |
3012 | return -ENOMEM; | |
3013 | ||
1ec3f75a | 3014 | len = strlen(str); |
8cdc1a81 MD |
3015 | WARN_ON_ONCE(!atomic_read(&session->priv->metadata_cache->producing)); |
3016 | if (session->priv->metadata_cache->metadata_written + len > | |
3017 | session->priv->metadata_cache->cache_alloc) { | |
d83004aa JD |
3018 | char *tmp_cache_realloc; |
3019 | unsigned int tmp_cache_alloc_size; | |
3020 | ||
3021 | tmp_cache_alloc_size = max_t(unsigned int, | |
8cdc1a81 MD |
3022 | session->priv->metadata_cache->cache_alloc + len, |
3023 | session->priv->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 3024 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
3025 | if (!tmp_cache_realloc) |
3026 | goto err; | |
8cdc1a81 | 3027 | if (session->priv->metadata_cache->data) { |
a606b6e8 | 3028 | memcpy(tmp_cache_realloc, |
8cdc1a81 MD |
3029 | session->priv->metadata_cache->data, |
3030 | session->priv->metadata_cache->cache_alloc); | |
3031 | vfree(session->priv->metadata_cache->data); | |
a606b6e8 ML |
3032 | } |
3033 | ||
8cdc1a81 MD |
3034 | session->priv->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
3035 | session->priv->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 3036 | } |
8cdc1a81 MD |
3037 | memcpy(session->priv->metadata_cache->data + |
3038 | session->priv->metadata_cache->metadata_written, | |
d83004aa | 3039 | str, len); |
8cdc1a81 | 3040 | session->priv->metadata_cache->metadata_written += len; |
c099397a | 3041 | kfree(str); |
d83004aa | 3042 | |
d83004aa JD |
3043 | return 0; |
3044 | ||
3045 | err: | |
3046 | kfree(str); | |
3047 | return -ENOMEM; | |
c099397a MD |
3048 | } |
3049 | ||
f513b2bf | 3050 | static |
8cdc1a81 | 3051 | int print_tabs(struct lttng_kernel_session *session, size_t nesting) |
f513b2bf MD |
3052 | { |
3053 | size_t i; | |
3054 | ||
3055 | for (i = 0; i < nesting; i++) { | |
3056 | int ret; | |
3057 | ||
3058 | ret = lttng_metadata_printf(session, " "); | |
3059 | if (ret) { | |
3060 | return ret; | |
3061 | } | |
3062 | } | |
3063 | return 0; | |
3064 | } | |
3065 | ||
ceabb767 | 3066 | static |
8cdc1a81 | 3067 | int lttng_field_name_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3068 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3069 | size_t nesting) |
3070 | { | |
3071 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
3072 | } | |
3073 | ||
3074 | static | |
8cdc1a81 | 3075 | int _lttng_integer_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3076 | const struct lttng_kernel_type_integer *type, |
3077 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 MD |
3078 | size_t nesting) |
3079 | { | |
3080 | int ret; | |
3081 | ||
ceabb767 MD |
3082 | ret = print_tabs(session, nesting); |
3083 | if (ret) | |
3084 | return ret; | |
3085 | ret = lttng_metadata_printf(session, | |
3086 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
437d5aa5 MD |
3087 | type->size, |
3088 | type->alignment, | |
3089 | type->signedness, | |
3090 | (parent_encoding == lttng_kernel_string_encoding_none) | |
ceabb767 | 3091 | ? "none" |
437d5aa5 | 3092 | : (parent_encoding == lttng_kernel_string_encoding_UTF8) |
ceabb767 MD |
3093 | ? "UTF8" |
3094 | : "ASCII", | |
437d5aa5 | 3095 | type->base, |
ceabb767 | 3096 | #if __BYTE_ORDER == __BIG_ENDIAN |
437d5aa5 | 3097 | type->reverse_byte_order ? " byte_order = le;" : "" |
ceabb767 | 3098 | #else |
437d5aa5 | 3099 | type->reverse_byte_order ? " byte_order = be;" : "" |
ceabb767 MD |
3100 | #endif |
3101 | ); | |
3102 | return ret; | |
3103 | } | |
3104 | ||
f513b2bf MD |
3105 | /* |
3106 | * Must be called with sessions_mutex held. | |
3107 | */ | |
3108 | static | |
8cdc1a81 | 3109 | int _lttng_struct_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3110 | const struct lttng_kernel_type_struct *type, |
f513b2bf MD |
3111 | size_t nesting) |
3112 | { | |
51ef4536 | 3113 | const char *prev_field_name = NULL; |
f513b2bf MD |
3114 | int ret; |
3115 | uint32_t i, nr_fields; | |
ceabb767 MD |
3116 | unsigned int alignment; |
3117 | ||
f513b2bf MD |
3118 | ret = print_tabs(session, nesting); |
3119 | if (ret) | |
3120 | return ret; | |
3121 | ret = lttng_metadata_printf(session, | |
3122 | "struct {\n"); | |
3123 | if (ret) | |
3124 | return ret; | |
437d5aa5 | 3125 | nr_fields = type->nr_fields; |
f513b2bf | 3126 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 3127 | const struct lttng_kernel_event_field *iter_field; |
f513b2bf | 3128 | |
437d5aa5 | 3129 | iter_field = type->fields[i]; |
51ef4536 | 3130 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, &prev_field_name); |
f513b2bf MD |
3131 | if (ret) |
3132 | return ret; | |
3133 | } | |
3134 | ret = print_tabs(session, nesting); | |
3135 | if (ret) | |
3136 | return ret; | |
437d5aa5 | 3137 | alignment = type->alignment; |
ceabb767 MD |
3138 | if (alignment) { |
3139 | ret = lttng_metadata_printf(session, | |
3140 | "} align(%u)", | |
3141 | alignment); | |
3142 | } else { | |
3143 | ret = lttng_metadata_printf(session, | |
3144 | "}"); | |
3145 | } | |
f513b2bf MD |
3146 | return ret; |
3147 | } | |
3148 | ||
3149 | /* | |
3150 | * Must be called with sessions_mutex held. | |
3151 | */ | |
3152 | static | |
8cdc1a81 | 3153 | int _lttng_struct_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3154 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3155 | size_t nesting) |
3156 | { | |
3157 | int ret; | |
3158 | ||
3159 | ret = _lttng_struct_type_statedump(session, | |
437d5aa5 | 3160 | lttng_kernel_get_type_struct(field->type), nesting); |
f513b2bf MD |
3161 | if (ret) |
3162 | return ret; | |
ceabb767 | 3163 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
3164 | } |
3165 | ||
65c85aa6 MD |
3166 | /* |
3167 | * Must be called with sessions_mutex held. | |
3168 | */ | |
3169 | static | |
8cdc1a81 | 3170 | int _lttng_variant_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3171 | const struct lttng_kernel_type_variant *type, |
51ef4536 MD |
3172 | size_t nesting, |
3173 | const char *prev_field_name) | |
65c85aa6 | 3174 | { |
51ef4536 | 3175 | const char *tag_name; |
65c85aa6 MD |
3176 | int ret; |
3177 | uint32_t i, nr_choices; | |
3178 | ||
51ef4536 MD |
3179 | tag_name = type->tag_name; |
3180 | if (!tag_name) | |
3181 | tag_name = prev_field_name; | |
3182 | if (!tag_name) | |
3183 | return -EINVAL; | |
ceabb767 MD |
3184 | /* |
3185 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
3186 | */ | |
437d5aa5 | 3187 | if (type->alignment != 0) |
ceabb767 | 3188 | return -EINVAL; |
65c85aa6 MD |
3189 | ret = print_tabs(session, nesting); |
3190 | if (ret) | |
3191 | return ret; | |
3192 | ret = lttng_metadata_printf(session, | |
3193 | "variant <_%s> {\n", | |
51ef4536 | 3194 | tag_name); |
65c85aa6 MD |
3195 | if (ret) |
3196 | return ret; | |
437d5aa5 | 3197 | nr_choices = type->nr_choices; |
65c85aa6 | 3198 | for (i = 0; i < nr_choices; i++) { |
437d5aa5 | 3199 | const struct lttng_kernel_event_field *iter_field; |
65c85aa6 | 3200 | |
437d5aa5 | 3201 | iter_field = type->choices[i]; |
51ef4536 | 3202 | ret = _lttng_field_statedump(session, iter_field, nesting + 1, NULL); |
65c85aa6 MD |
3203 | if (ret) |
3204 | return ret; | |
3205 | } | |
3206 | ret = print_tabs(session, nesting); | |
3207 | if (ret) | |
3208 | return ret; | |
3209 | ret = lttng_metadata_printf(session, | |
3210 | "}"); | |
3211 | return ret; | |
3212 | } | |
3213 | ||
3214 | /* | |
3215 | * Must be called with sessions_mutex held. | |
3216 | */ | |
3217 | static | |
8cdc1a81 | 3218 | int _lttng_variant_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3219 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3220 | size_t nesting, |
3221 | const char *prev_field_name) | |
65c85aa6 MD |
3222 | { |
3223 | int ret; | |
3224 | ||
3225 | ret = _lttng_variant_type_statedump(session, | |
51ef4536 MD |
3226 | lttng_kernel_get_type_variant(field->type), nesting, |
3227 | prev_field_name); | |
65c85aa6 MD |
3228 | if (ret) |
3229 | return ret; | |
ceabb767 | 3230 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
3231 | } |
3232 | ||
f513b2bf MD |
3233 | /* |
3234 | * Must be called with sessions_mutex held. | |
3235 | */ | |
3236 | static | |
8cdc1a81 | 3237 | int _lttng_array_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3238 | const struct lttng_kernel_event_field *field, |
f513b2bf MD |
3239 | size_t nesting) |
3240 | { | |
3241 | int ret; | |
437d5aa5 MD |
3242 | const struct lttng_kernel_type_array *array_type; |
3243 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3244 | |
437d5aa5 MD |
3245 | array_type = lttng_kernel_get_type_array(field->type); |
3246 | WARN_ON_ONCE(!array_type); | |
ceabb767 | 3247 | |
437d5aa5 | 3248 | if (array_type->alignment) { |
ceabb767 | 3249 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3250 | if (ret) |
3251 | return ret; | |
ceabb767 MD |
3252 | ret = lttng_metadata_printf(session, |
3253 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3254 | array_type->alignment * CHAR_BIT, |
ceabb767 MD |
3255 | field->name); |
3256 | if (ret) | |
3257 | return ret; | |
3258 | } | |
3259 | /* | |
3260 | * Nested compound types: Only array of structures and variants are | |
3261 | * currently supported. | |
3262 | */ | |
437d5aa5 | 3263 | elem_type = array_type->elem_type; |
12bb2edb MD |
3264 | switch (elem_type->type) { |
3265 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3266 | case lttng_kernel_type_struct: |
3267 | case lttng_kernel_type_variant: | |
3268 | ret = _lttng_type_statedump(session, elem_type, | |
3269 | array_type->encoding, nesting); | |
65c85aa6 MD |
3270 | if (ret) |
3271 | return ret; | |
3272 | break; | |
ceabb767 | 3273 | |
f513b2bf MD |
3274 | default: |
3275 | return -EINVAL; | |
3276 | } | |
3277 | ret = lttng_metadata_printf(session, | |
3278 | " _%s[%u];\n", | |
3279 | field->name, | |
437d5aa5 | 3280 | array_type->length); |
f513b2bf MD |
3281 | return ret; |
3282 | } | |
3283 | ||
3284 | /* | |
3285 | * Must be called with sessions_mutex held. | |
3286 | */ | |
3287 | static | |
8cdc1a81 | 3288 | int _lttng_sequence_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3289 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3290 | size_t nesting, |
3291 | const char *prev_field_name) | |
f513b2bf MD |
3292 | { |
3293 | int ret; | |
3294 | const char *length_name; | |
437d5aa5 MD |
3295 | const struct lttng_kernel_type_sequence *sequence_type; |
3296 | const struct lttng_kernel_type_common *elem_type; | |
f513b2bf | 3297 | |
437d5aa5 MD |
3298 | sequence_type = lttng_kernel_get_type_sequence(field->type); |
3299 | WARN_ON_ONCE(!sequence_type); | |
f513b2bf | 3300 | |
437d5aa5 | 3301 | length_name = sequence_type->length_name; |
51ef4536 MD |
3302 | if (!length_name) |
3303 | length_name = prev_field_name; | |
3304 | if (!length_name) | |
3305 | return -EINVAL; | |
ceabb767 | 3306 | |
437d5aa5 | 3307 | if (sequence_type->alignment) { |
ceabb767 | 3308 | ret = print_tabs(session, nesting); |
f513b2bf MD |
3309 | if (ret) |
3310 | return ret; | |
ceabb767 MD |
3311 | ret = lttng_metadata_printf(session, |
3312 | "struct { } align(%u) _%s_padding;\n", | |
437d5aa5 | 3313 | sequence_type->alignment * CHAR_BIT, |
ceabb767 MD |
3314 | field->name); |
3315 | if (ret) | |
3316 | return ret; | |
3317 | } | |
3318 | ||
3319 | /* | |
3320 | * Nested compound types: Only array of structures and variants are | |
3321 | * currently supported. | |
3322 | */ | |
437d5aa5 | 3323 | elem_type = sequence_type->elem_type; |
12bb2edb MD |
3324 | switch (elem_type->type) { |
3325 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3326 | case lttng_kernel_type_struct: |
3327 | case lttng_kernel_type_variant: | |
3328 | ret = _lttng_type_statedump(session, elem_type, | |
3329 | sequence_type->encoding, nesting); | |
65c85aa6 MD |
3330 | if (ret) |
3331 | return ret; | |
3332 | break; | |
ceabb767 | 3333 | |
f513b2bf MD |
3334 | default: |
3335 | return -EINVAL; | |
3336 | } | |
3337 | ret = lttng_metadata_printf(session, | |
3338 | " _%s[ _%s ];\n", | |
3339 | field->name, | |
51ef4536 | 3340 | length_name); |
f513b2bf MD |
3341 | return ret; |
3342 | } | |
3343 | ||
141ddf28 MD |
3344 | /* |
3345 | * Must be called with sessions_mutex held. | |
3346 | */ | |
3347 | static | |
8cdc1a81 | 3348 | int _lttng_enum_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3349 | const struct lttng_kernel_type_enum *type, |
141ddf28 MD |
3350 | size_t nesting) |
3351 | { | |
d96a4a7a | 3352 | const struct lttng_kernel_enum_desc *enum_desc; |
437d5aa5 | 3353 | const struct lttng_kernel_type_common *container_type; |
141ddf28 MD |
3354 | int ret; |
3355 | unsigned int i, nr_entries; | |
3356 | ||
437d5aa5 | 3357 | container_type = type->container_type; |
12bb2edb | 3358 | if (container_type->type != lttng_kernel_type_integer) { |
ceabb767 MD |
3359 | ret = -EINVAL; |
3360 | goto end; | |
3361 | } | |
437d5aa5 | 3362 | enum_desc = type->desc; |
141ddf28 MD |
3363 | nr_entries = enum_desc->nr_entries; |
3364 | ||
3365 | ret = print_tabs(session, nesting); | |
3366 | if (ret) | |
3367 | goto end; | |
ceabb767 MD |
3368 | ret = lttng_metadata_printf(session, "enum : "); |
3369 | if (ret) | |
3370 | goto end; | |
437d5aa5 MD |
3371 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(container_type), |
3372 | lttng_kernel_string_encoding_none, 0); | |
141ddf28 | 3373 | if (ret) |
ceabb767 MD |
3374 | goto end; |
3375 | ret = lttng_metadata_printf(session, " {\n"); | |
3376 | if (ret) | |
3377 | goto end; | |
141ddf28 MD |
3378 | /* Dump all entries */ |
3379 | for (i = 0; i < nr_entries; i++) { | |
437d5aa5 | 3380 | const struct lttng_kernel_enum_entry *entry = enum_desc->entries[i]; |
141ddf28 MD |
3381 | int j, len; |
3382 | ||
3383 | ret = print_tabs(session, nesting + 1); | |
3384 | if (ret) | |
3385 | goto end; | |
3386 | ret = lttng_metadata_printf(session, | |
3387 | "\""); | |
3388 | if (ret) | |
3389 | goto end; | |
3390 | len = strlen(entry->string); | |
3391 | /* Escape the character '"' */ | |
3392 | for (j = 0; j < len; j++) { | |
3393 | char c = entry->string[j]; | |
3394 | ||
3395 | switch (c) { | |
3396 | case '"': | |
3397 | ret = lttng_metadata_printf(session, | |
3398 | "\\\""); | |
3399 | break; | |
3400 | case '\\': | |
3401 | ret = lttng_metadata_printf(session, | |
3402 | "\\\\"); | |
3403 | break; | |
3404 | default: | |
3405 | ret = lttng_metadata_printf(session, | |
3406 | "%c", c); | |
3407 | break; | |
3408 | } | |
3409 | if (ret) | |
3410 | goto end; | |
3411 | } | |
08ad1061 PP |
3412 | ret = lttng_metadata_printf(session, "\""); |
3413 | if (ret) | |
3414 | goto end; | |
3415 | ||
3416 | if (entry->options.is_auto) { | |
3417 | ret = lttng_metadata_printf(session, ",\n"); | |
3418 | if (ret) | |
3419 | goto end; | |
141ddf28 | 3420 | } else { |
7c559490 MD |
3421 | ret = lttng_metadata_printf(session, |
3422 | " = "); | |
3423 | if (ret) | |
3424 | goto end; | |
3425 | if (entry->start.signedness) | |
141ddf28 | 3426 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3427 | "%lld", (long long) entry->start.value); |
3428 | else | |
3429 | ret = lttng_metadata_printf(session, | |
3430 | "%llu", entry->start.value); | |
3431 | if (ret) | |
3432 | goto end; | |
3433 | if (entry->start.signedness == entry->end.signedness && | |
3434 | entry->start.value | |
3435 | == entry->end.value) { | |
141ddf28 | 3436 | ret = lttng_metadata_printf(session, |
7c559490 MD |
3437 | ",\n"); |
3438 | } else { | |
3439 | if (entry->end.signedness) { | |
3440 | ret = lttng_metadata_printf(session, | |
3441 | " ... %lld,\n", | |
3442 | (long long) entry->end.value); | |
3443 | } else { | |
3444 | ret = lttng_metadata_printf(session, | |
3445 | " ... %llu,\n", | |
3446 | entry->end.value); | |
3447 | } | |
141ddf28 | 3448 | } |
7c559490 MD |
3449 | if (ret) |
3450 | goto end; | |
141ddf28 | 3451 | } |
141ddf28 MD |
3452 | } |
3453 | ret = print_tabs(session, nesting); | |
3454 | if (ret) | |
3455 | goto end; | |
ceabb767 | 3456 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
3457 | end: |
3458 | return ret; | |
3459 | } | |
3460 | ||
d83004aa JD |
3461 | /* |
3462 | * Must be called with sessions_mutex held. | |
3463 | */ | |
c099397a | 3464 | static |
8cdc1a81 | 3465 | int _lttng_enum_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3466 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3467 | size_t nesting) |
3468 | { | |
3469 | int ret; | |
437d5aa5 | 3470 | const struct lttng_kernel_type_enum *enum_type; |
ceabb767 | 3471 | |
437d5aa5 MD |
3472 | enum_type = lttng_kernel_get_type_enum(field->type); |
3473 | WARN_ON_ONCE(!enum_type); | |
3474 | ret = _lttng_enum_type_statedump(session, enum_type, nesting); | |
ceabb767 MD |
3475 | if (ret) |
3476 | return ret; | |
3477 | return lttng_field_name_statedump(session, field, nesting); | |
3478 | } | |
3479 | ||
3480 | static | |
8cdc1a81 | 3481 | int _lttng_integer_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3482 | const struct lttng_kernel_event_field *field, |
ceabb767 MD |
3483 | size_t nesting) |
3484 | { | |
3485 | int ret; | |
3486 | ||
437d5aa5 MD |
3487 | ret = _lttng_integer_type_statedump(session, lttng_kernel_get_type_integer(field->type), |
3488 | lttng_kernel_string_encoding_none, nesting); | |
ceabb767 MD |
3489 | if (ret) |
3490 | return ret; | |
3491 | return lttng_field_name_statedump(session, field, nesting); | |
3492 | } | |
3493 | ||
3494 | static | |
8cdc1a81 | 3495 | int _lttng_string_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3496 | const struct lttng_kernel_type_string *type, |
ceabb767 MD |
3497 | size_t nesting) |
3498 | { | |
3499 | int ret; | |
3500 | ||
ceabb767 MD |
3501 | /* Default encoding is UTF8 */ |
3502 | ret = print_tabs(session, nesting); | |
3503 | if (ret) | |
3504 | return ret; | |
3505 | ret = lttng_metadata_printf(session, | |
3506 | "string%s", | |
437d5aa5 | 3507 | type->encoding == lttng_kernel_string_encoding_ASCII ? |
ceabb767 MD |
3508 | " { encoding = ASCII; }" : ""); |
3509 | return ret; | |
3510 | } | |
3511 | ||
3512 | static | |
8cdc1a81 | 3513 | int _lttng_string_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3514 | const struct lttng_kernel_event_field *field, |
f513b2bf | 3515 | size_t nesting) |
ceabb767 | 3516 | { |
437d5aa5 | 3517 | const struct lttng_kernel_type_string *string_type; |
ceabb767 MD |
3518 | int ret; |
3519 | ||
437d5aa5 MD |
3520 | string_type = lttng_kernel_get_type_string(field->type); |
3521 | WARN_ON_ONCE(!string_type); | |
3522 | ret = _lttng_string_type_statedump(session, string_type, nesting); | |
ceabb767 MD |
3523 | if (ret) |
3524 | return ret; | |
3525 | return lttng_field_name_statedump(session, field, nesting); | |
3526 | } | |
3527 | ||
3528 | /* | |
3529 | * Must be called with sessions_mutex held. | |
3530 | */ | |
3531 | static | |
8cdc1a81 | 3532 | int _lttng_type_statedump(struct lttng_kernel_session *session, |
437d5aa5 MD |
3533 | const struct lttng_kernel_type_common *type, |
3534 | enum lttng_kernel_string_encoding parent_encoding, | |
ceabb767 | 3535 | size_t nesting) |
c099397a | 3536 | { |
c099397a | 3537 | int ret = 0; |
c099397a | 3538 | |
12bb2edb MD |
3539 | switch (type->type) { |
3540 | case lttng_kernel_type_integer: | |
437d5aa5 MD |
3541 | ret = _lttng_integer_type_statedump(session, |
3542 | lttng_kernel_get_type_integer(type), | |
3543 | parent_encoding, nesting); | |
8070f5c0 | 3544 | break; |
437d5aa5 MD |
3545 | case lttng_kernel_type_enum: |
3546 | ret = _lttng_enum_type_statedump(session, | |
3547 | lttng_kernel_get_type_enum(type), | |
3548 | nesting); | |
8070f5c0 | 3549 | break; |
12bb2edb | 3550 | case lttng_kernel_type_string: |
437d5aa5 MD |
3551 | ret = _lttng_string_type_statedump(session, |
3552 | lttng_kernel_get_type_string(type), | |
3553 | nesting); | |
ceabb767 | 3554 | break; |
437d5aa5 MD |
3555 | case lttng_kernel_type_struct: |
3556 | ret = _lttng_struct_type_statedump(session, | |
3557 | lttng_kernel_get_type_struct(type), | |
3558 | nesting); | |
8070f5c0 | 3559 | break; |
437d5aa5 MD |
3560 | case lttng_kernel_type_variant: |
3561 | ret = _lttng_variant_type_statedump(session, | |
3562 | lttng_kernel_get_type_variant(type), | |
51ef4536 | 3563 | nesting, NULL); |
ceabb767 MD |
3564 | break; |
3565 | ||
3566 | /* Nested arrays and sequences are not supported yet. */ | |
437d5aa5 MD |
3567 | case lttng_kernel_type_array: |
3568 | case lttng_kernel_type_sequence: | |
ceabb767 MD |
3569 | default: |
3570 | WARN_ON_ONCE(1); | |
3571 | return -EINVAL; | |
8070f5c0 | 3572 | } |
ceabb767 MD |
3573 | return ret; |
3574 | } | |
8070f5c0 | 3575 | |
ceabb767 MD |
3576 | /* |
3577 | * Must be called with sessions_mutex held. | |
3578 | */ | |
3579 | static | |
8cdc1a81 | 3580 | int _lttng_field_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3581 | const struct lttng_kernel_event_field *field, |
51ef4536 MD |
3582 | size_t nesting, |
3583 | const char **prev_field_name_p) | |
ceabb767 | 3584 | { |
51ef4536 | 3585 | const char *prev_field_name = NULL; |
ceabb767 | 3586 | int ret = 0; |
27d2368e | 3587 | |
51ef4536 MD |
3588 | if (prev_field_name_p) |
3589 | prev_field_name = *prev_field_name_p; | |
437d5aa5 | 3590 | switch (field->type->type) { |
12bb2edb | 3591 | case lttng_kernel_type_integer: |
ceabb767 MD |
3592 | ret = _lttng_integer_field_statedump(session, field, nesting); |
3593 | break; | |
437d5aa5 | 3594 | case lttng_kernel_type_enum: |
ceabb767 | 3595 | ret = _lttng_enum_field_statedump(session, field, nesting); |
8070f5c0 | 3596 | break; |
12bb2edb | 3597 | case lttng_kernel_type_string: |
ceabb767 | 3598 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3599 | break; |
437d5aa5 | 3600 | case lttng_kernel_type_struct: |
ceabb767 | 3601 | ret = _lttng_struct_field_statedump(session, field, nesting); |
f513b2bf | 3602 | break; |
437d5aa5 | 3603 | case lttng_kernel_type_array: |
ceabb767 | 3604 | ret = _lttng_array_field_statedump(session, field, nesting); |
f513b2bf | 3605 | break; |
437d5aa5 | 3606 | case lttng_kernel_type_sequence: |
51ef4536 | 3607 | ret = _lttng_sequence_field_statedump(session, field, nesting, prev_field_name); |
f513b2bf | 3608 | break; |
437d5aa5 | 3609 | case lttng_kernel_type_variant: |
51ef4536 | 3610 | ret = _lttng_variant_field_statedump(session, field, nesting, prev_field_name); |
65c85aa6 | 3611 | break; |
f513b2bf | 3612 | |
8070f5c0 MD |
3613 | default: |
3614 | WARN_ON_ONCE(1); | |
3615 | return -EINVAL; | |
3616 | } | |
51ef4536 MD |
3617 | if (prev_field_name_p) |
3618 | *prev_field_name_p = field->name; | |
8070f5c0 MD |
3619 | return ret; |
3620 | } | |
3621 | ||
3622 | static | |
8cdc1a81 | 3623 | int _lttng_context_metadata_statedump(struct lttng_kernel_session *session, |
437d5aa5 | 3624 | struct lttng_kernel_ctx *ctx) |
8070f5c0 | 3625 | { |
51ef4536 | 3626 | const char *prev_field_name = NULL; |
8070f5c0 MD |
3627 | int ret = 0; |
3628 | int i; | |
3629 | ||
3630 | if (!ctx) | |
3631 | return 0; | |
3632 | for (i = 0; i < ctx->nr_fields; i++) { | |
437d5aa5 | 3633 | const struct lttng_kernel_ctx_field *field = &ctx->fields[i]; |
8070f5c0 | 3634 | |
51ef4536 | 3635 | ret = _lttng_field_statedump(session, field->event_field, 2, &prev_field_name); |
8070f5c0 MD |
3636 | if (ret) |
3637 | return ret; | |
3638 | } | |
3639 | return ret; | |
3640 | } | |
3641 | ||
3642 | static | |
8cdc1a81 | 3643 | int _lttng_fields_metadata_statedump(struct lttng_kernel_session *session, |
a67ba386 | 3644 | struct lttng_kernel_event_recorder *event_recorder) |
8070f5c0 | 3645 | { |
51ef4536 | 3646 | const char *prev_field_name = NULL; |
a67ba386 | 3647 | const struct lttng_kernel_event_desc *desc = event_recorder->priv->parent.desc; |
8070f5c0 MD |
3648 | int ret = 0; |
3649 | int i; | |
3650 | ||
6c8c025b MD |
3651 | for (i = 0; i < desc->tp_class->nr_fields; i++) { |
3652 | const struct lttng_kernel_event_field *field = desc->tp_class->fields[i]; | |
8070f5c0 | 3653 | |
51ef4536 | 3654 | ret = _lttng_field_statedump(session, field, 2, &prev_field_name); |
8070f5c0 MD |
3655 | if (ret) |
3656 | return ret; | |
c099397a MD |
3657 | } |
3658 | return ret; | |
3659 | } | |
3660 | ||
d83004aa JD |
3661 | /* |
3662 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3663 | * The entire event metadata is printed as a single atomic metadata |
3664 | * transaction. | |
d83004aa | 3665 | */ |
c099397a | 3666 | static |
8cdc1a81 | 3667 | int _lttng_event_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3668 | struct lttng_kernel_channel_buffer *chan, |
a67ba386 | 3669 | struct lttng_kernel_event_recorder *event_recorder) |
c099397a MD |
3670 | { |
3671 | int ret = 0; | |
3672 | ||
a67ba386 | 3673 | if (event_recorder->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3674 | return 0; |
f7d06400 | 3675 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3676 | return 0; |
3677 | ||
8b97fd42 MD |
3678 | lttng_metadata_begin(session); |
3679 | ||
c099397a MD |
3680 | ret = lttng_metadata_printf(session, |
3681 | "event {\n" | |
ae734547 | 3682 | " name = \"%s\";\n" |
c099397a | 3683 | " id = %u;\n" |
b9074a1b | 3684 | " stream_id = %u;\n", |
a67ba386 MD |
3685 | event_recorder->priv->parent.desc->event_name, |
3686 | event_recorder->priv->id, | |
f7d06400 | 3687 | event_recorder->chan->priv->id); |
c099397a MD |
3688 | if (ret) |
3689 | goto end; | |
3690 | ||
8070f5c0 | 3691 | ret = lttng_metadata_printf(session, |
8070f5c0 MD |
3692 | " fields := struct {\n" |
3693 | ); | |
3694 | if (ret) | |
3695 | goto end; | |
3696 | ||
a67ba386 | 3697 | ret = _lttng_fields_metadata_statedump(session, event_recorder); |
c099397a MD |
3698 | if (ret) |
3699 | goto end; | |
3700 | ||
3701 | /* | |
3702 | * LTTng space reservation can only reserve multiples of the | |
3703 | * byte size. | |
3704 | */ | |
3705 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3706 | " };\n" |
3707 | "};\n\n"); | |
c099397a MD |
3708 | if (ret) |
3709 | goto end; | |
3710 | ||
a67ba386 | 3711 | event_recorder->priv->metadata_dumped = 1; |
c099397a | 3712 | end: |
8b97fd42 | 3713 | lttng_metadata_end(session); |
c099397a MD |
3714 | return ret; |
3715 | ||
3716 | } | |
3717 | ||
d83004aa JD |
3718 | /* |
3719 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3720 | * The entire channel metadata is printed as a single atomic metadata |
3721 | * transaction. | |
d83004aa | 3722 | */ |
c099397a | 3723 | static |
8cdc1a81 | 3724 | int _lttng_channel_metadata_statedump(struct lttng_kernel_session *session, |
f7d06400 | 3725 | struct lttng_kernel_channel_buffer *chan) |
c099397a MD |
3726 | { |
3727 | int ret = 0; | |
3728 | ||
f7d06400 | 3729 | if (chan->priv->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3730 | return 0; |
d83004aa | 3731 | |
f7d06400 | 3732 | if (chan->priv->channel_type == METADATA_CHANNEL) |
c099397a MD |
3733 | return 0; |
3734 | ||
8b97fd42 MD |
3735 | lttng_metadata_begin(session); |
3736 | ||
f7d06400 | 3737 | WARN_ON_ONCE(!chan->priv->header_type); |
c099397a MD |
3738 | ret = lttng_metadata_printf(session, |
3739 | "stream {\n" | |
3740 | " id = %u;\n" | |
9115fbdc | 3741 | " event.header := %s;\n" |
b9074a1b | 3742 | " packet.context := struct packet_context;\n", |
f7d06400 MD |
3743 | chan->priv->id, |
3744 | chan->priv->header_type == 1 ? "struct event_header_compact" : | |
c099397a MD |
3745 | "struct event_header_large"); |
3746 | if (ret) | |
3747 | goto end; | |
3748 | ||
f7d06400 | 3749 | if (chan->priv->ctx) { |
b9074a1b MD |
3750 | ret = lttng_metadata_printf(session, |
3751 | " event.context := struct {\n"); | |
3752 | if (ret) | |
3753 | goto end; | |
3754 | } | |
f7d06400 | 3755 | ret = _lttng_context_metadata_statedump(session, chan->priv->ctx); |
8070f5c0 MD |
3756 | if (ret) |
3757 | goto end; | |
f7d06400 | 3758 | if (chan->priv->ctx) { |
b9074a1b MD |
3759 | ret = lttng_metadata_printf(session, |
3760 | " };\n"); | |
3761 | if (ret) | |
3762 | goto end; | |
3763 | } | |
8070f5c0 MD |
3764 | |
3765 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3766 | "};\n\n"); |
8070f5c0 | 3767 | |
f7d06400 | 3768 | chan->priv->metadata_dumped = 1; |
c099397a | 3769 | end: |
8b97fd42 | 3770 | lttng_metadata_end(session); |
c099397a MD |
3771 | return ret; |
3772 | } | |
3773 | ||
d83004aa JD |
3774 | /* |
3775 | * Must be called with sessions_mutex held. | |
3776 | */ | |
9115fbdc | 3777 | static |
8cdc1a81 | 3778 | int _lttng_stream_packet_context_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3779 | { |
3780 | return lttng_metadata_printf(session, | |
3781 | "struct packet_context {\n" | |
a3ccff4f MD |
3782 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3783 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3784 | " uint64_t content_size;\n" |
3785 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3786 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3787 | " unsigned long events_discarded;\n" |
9115fbdc | 3788 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3789 | "};\n\n" |
9115fbdc MD |
3790 | ); |
3791 | } | |
3792 | ||
3793 | /* | |
3794 | * Compact header: | |
3795 | * id: range: 0 - 30. | |
3796 | * id 31 is reserved to indicate an extended header. | |
3797 | * | |
3798 | * Large header: | |
3799 | * id: range: 0 - 65534. | |
3800 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3801 | * |
3802 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3803 | */ |
3804 | static | |
8cdc1a81 | 3805 | int _lttng_event_header_declare(struct lttng_kernel_session *session) |
9115fbdc MD |
3806 | { |
3807 | return lttng_metadata_printf(session, | |
3808 | "struct event_header_compact {\n" | |
3809 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3810 | " variant <id> {\n" | |
3811 | " struct {\n" | |
a3ccff4f | 3812 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3813 | " } compact;\n" |
3814 | " struct {\n" | |
3815 | " uint32_t id;\n" | |
a3ccff4f | 3816 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3817 | " } extended;\n" |
3818 | " } v;\n" | |
3819 | "} align(%u);\n" | |
3820 | "\n" | |
3821 | "struct event_header_large {\n" | |
3822 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3823 | " variant <id> {\n" | |
3824 | " struct {\n" | |
a3ccff4f | 3825 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3826 | " } compact;\n" |
3827 | " struct {\n" | |
3828 | " uint32_t id;\n" | |
a3ccff4f | 3829 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3830 | " } extended;\n" |
3831 | " } v;\n" | |
3832 | "} align(%u);\n\n", | |
a90917c3 MD |
3833 | lttng_alignof(uint32_t) * CHAR_BIT, |
3834 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3835 | ); |
3836 | } | |
3837 | ||
a3ccff4f MD |
3838 | /* |
3839 | * Approximation of NTP time of day to clock monotonic correlation, | |
3840 | * taken at start of trace. | |
3841 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3842 | * in future versions. | |
5283350b MD |
3843 | * This function may return a negative offset. It may happen if the |
3844 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3845 | * |
3846 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3847 | * y2038 compliant. | |
a3ccff4f MD |
3848 | */ |
3849 | static | |
8967b2a3 | 3850 | int64_t measure_clock_offset(void) |
a3ccff4f | 3851 | { |
dcb93448 | 3852 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3853 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3854 | int64_t offset; |
a3ccff4f | 3855 | unsigned long flags; |
3636085f MJ |
3856 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3857 | struct timespec64 rts = { 0, 0 }; | |
3858 | #else | |
3859 | struct timespec rts = { 0, 0 }; | |
3860 | #endif | |
a3ccff4f MD |
3861 | |
3862 | /* Disable interrupts to increase correlation precision. */ | |
3863 | local_irq_save(flags); | |
3864 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3865 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3866 | ktime_get_real_ts64(&rts); | |
3867 | #else | |
216b6baa | 3868 | getnstimeofday(&rts); |
3636085f | 3869 | #endif |
a3ccff4f MD |
3870 | monotonic[1] = trace_clock_read64(); |
3871 | local_irq_restore(flags); | |
3872 | ||
dcb93448 | 3873 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3874 | realtime = (uint64_t) rts.tv_sec * tcf; |
3875 | if (tcf == NSEC_PER_SEC) { | |
3876 | realtime += rts.tv_nsec; | |
3877 | } else { | |
3878 | uint64_t n = rts.tv_nsec * tcf; | |
3879 | ||
3880 | do_div(n, NSEC_PER_SEC); | |
3881 | realtime += n; | |
3882 | } | |
dcb93448 | 3883 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3884 | return offset; |
3885 | } | |
3886 | ||
3eb95be4 | 3887 | static |
8cdc1a81 | 3888 | int print_escaped_ctf_string(struct lttng_kernel_session *session, const char *string) |
3eb95be4 | 3889 | { |
0f3eaad4 | 3890 | int ret = 0; |
3eb95be4 JR |
3891 | size_t i; |
3892 | char cur; | |
3893 | ||
3894 | i = 0; | |
3895 | cur = string[i]; | |
3896 | while (cur != '\0') { | |
3897 | switch (cur) { | |
3898 | case '\n': | |
3899 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3900 | break; | |
3901 | case '\\': | |
3902 | case '"': | |
3903 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3904 | if (ret) | |
3905 | goto error; | |
3906 | /* We still print the current char */ | |
c190d76e | 3907 | lttng_fallthrough; |
3eb95be4 JR |
3908 | default: |
3909 | ret = lttng_metadata_printf(session, "%c", cur); | |
3910 | break; | |
3911 | } | |
3912 | ||
3913 | if (ret) | |
3914 | goto error; | |
3915 | ||
3916 | cur = string[++i]; | |
3917 | } | |
3918 | error: | |
3919 | return ret; | |
3920 | } | |
3921 | ||
3922 | static | |
8cdc1a81 | 3923 | int print_metadata_escaped_field(struct lttng_kernel_session *session, const char *field, |
1c88f269 | 3924 | const char *field_value) |
3eb95be4 JR |
3925 | { |
3926 | int ret; | |
3927 | ||
1c88f269 | 3928 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3929 | if (ret) |
3930 | goto error; | |
3931 | ||
1c88f269 | 3932 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3933 | if (ret) |
3934 | goto error; | |
3935 | ||
3936 | ret = lttng_metadata_printf(session, "\";\n"); | |
3937 | ||
3938 | error: | |
3939 | return ret; | |
3940 | } | |
3941 | ||
c099397a MD |
3942 | /* |
3943 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3944 | * Must be called with sessions_mutex held. |
c099397a MD |
3945 | */ |
3946 | static | |
8cdc1a81 | 3947 | int _lttng_session_metadata_statedump(struct lttng_kernel_session *session) |
c099397a | 3948 | { |
8cdc1a81 | 3949 | unsigned char *uuid_c = session->priv->uuid.b; |
a82c63f1 | 3950 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3951 | const char *product_uuid; |
f7d06400 | 3952 | struct lttng_kernel_channel_buffer_private *chan_priv; |
a67ba386 | 3953 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
c099397a MD |
3954 | int ret = 0; |
3955 | ||
585e5dcc | 3956 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3957 | return 0; |
8b97fd42 MD |
3958 | |
3959 | lttng_metadata_begin(session); | |
3960 | ||
8cdc1a81 | 3961 | if (session->priv->metadata_dumped) |
c099397a | 3962 | goto skip_session; |
c099397a | 3963 | |
d793d5e1 | 3964 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3965 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3966 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3967 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3968 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3969 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3970 | |
3971 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3972 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3973 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3974 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3975 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3976 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3977 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3978 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3979 | "\n" |
3980 | "trace {\n" | |
3981 | " major = %u;\n" | |
3982 | " minor = %u;\n" | |
30bdb6e4 | 3983 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3984 | " byte_order = %s;\n" |
3985 | " packet.header := struct {\n" | |
3986 | " uint32_t magic;\n" | |
1ec3f75a | 3987 | " uint8_t uuid[16];\n" |
d793d5e1 | 3988 | " uint32_t stream_id;\n" |
5594698f | 3989 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3990 | " };\n" |
d793d5e1 | 3991 | "};\n\n", |
a90917c3 MD |
3992 | lttng_alignof(uint8_t) * CHAR_BIT, |
3993 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3994 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3995 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3996 | sizeof(unsigned long) * CHAR_BIT, |
3997 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3998 | CTF_SPEC_MAJOR, |
3999 | CTF_SPEC_MINOR, | |
d793d5e1 | 4000 | uuid_s, |
5214fa50 | 4001 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
4002 | "be" |
4003 | #else | |
4004 | "le" | |
4005 | #endif | |
4006 | ); | |
4007 | if (ret) | |
4008 | goto end; | |
4009 | ||
99dc9597 MD |
4010 | ret = lttng_metadata_printf(session, |
4011 | "env {\n" | |
a6058143 | 4012 | " hostname = \"%s\";\n" |
c6c9e10f | 4013 | " domain = \"kernel\";\n" |
99dc9597 | 4014 | " sysname = \"%s\";\n" |
c6c9e10f MD |
4015 | " kernel_release = \"%s\";\n" |
4016 | " kernel_version = \"%s\";\n" | |
4017 | " tracer_name = \"lttng-modules\";\n" | |
4018 | " tracer_major = %d;\n" | |
4019 | " tracer_minor = %d;\n" | |
4020 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 4021 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 4022 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
4023 | utsname()->sysname, |
4024 | utsname()->release, | |
c6c9e10f MD |
4025 | utsname()->version, |
4026 | LTTNG_MODULES_MAJOR_VERSION, | |
4027 | LTTNG_MODULES_MINOR_VERSION, | |
4028 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
4029 | ); |
4030 | if (ret) | |
4031 | goto end; | |
4032 | ||
8cdc1a81 | 4033 | ret = print_metadata_escaped_field(session, "trace_name", session->priv->name); |
1c88f269 JR |
4034 | if (ret) |
4035 | goto end; | |
4036 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
8cdc1a81 | 4037 | session->priv->creation_time); |
3eb95be4 JR |
4038 | if (ret) |
4039 | goto end; | |
4040 | ||
c88f762e GB |
4041 | /* Add the product UUID to the 'env' section */ |
4042 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
4043 | if (product_uuid) { | |
4044 | ret = lttng_metadata_printf(session, | |
4045 | " product_uuid = \"%s\";\n", | |
4046 | product_uuid | |
4047 | ); | |
4048 | if (ret) | |
4049 | goto end; | |
4050 | } | |
4051 | ||
4052 | /* Close the 'env' section */ | |
3eb95be4 JR |
4053 | ret = lttng_metadata_printf(session, "};\n\n"); |
4054 | if (ret) | |
4055 | goto end; | |
4056 | ||
a3ccff4f MD |
4057 | ret = lttng_metadata_printf(session, |
4058 | "clock {\n" | |
2754583e MD |
4059 | " name = \"%s\";\n", |
4060 | trace_clock_name() | |
a82c63f1 MD |
4061 | ); |
4062 | if (ret) | |
4063 | goto end; | |
4064 | ||
4065 | if (!trace_clock_uuid(clock_uuid_s)) { | |
4066 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 4067 | " uuid = \"%s\";\n", |
a82c63f1 MD |
4068 | clock_uuid_s |
4069 | ); | |
4070 | if (ret) | |
4071 | goto end; | |
4072 | } | |
4073 | ||
4074 | ret = lttng_metadata_printf(session, | |
2754583e | 4075 | " description = \"%s\";\n" |
a3ccff4f MD |
4076 | " freq = %llu; /* Frequency, in Hz */\n" |
4077 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 4078 | " offset = %lld;\n" |
a3ccff4f | 4079 | "};\n\n", |
2754583e | 4080 | trace_clock_description(), |
a3ccff4f | 4081 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 4082 | (long long) measure_clock_offset() |
a3ccff4f MD |
4083 | ); |
4084 | if (ret) | |
4085 | goto end; | |
4086 | ||
4087 | ret = lttng_metadata_printf(session, | |
4088 | "typealias integer {\n" | |
4089 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 4090 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4091 | "} := uint27_clock_monotonic_t;\n" |
4092 | "\n" | |
4093 | "typealias integer {\n" | |
4094 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 4095 | " map = clock.%s.value;\n" |
a3ccff4f MD |
4096 | "} := uint32_clock_monotonic_t;\n" |
4097 | "\n" | |
4098 | "typealias integer {\n" | |
4099 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 4100 | " map = clock.%s.value;\n" |
a3ccff4f | 4101 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 4102 | trace_clock_name(), |
a3ccff4f | 4103 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
4104 | trace_clock_name(), |
4105 | lttng_alignof(uint64_t) * CHAR_BIT, | |
4106 | trace_clock_name() | |
a3ccff4f MD |
4107 | ); |
4108 | if (ret) | |
4109 | goto end; | |
4110 | ||
a90917c3 | 4111 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
4112 | if (ret) |
4113 | goto end; | |
4114 | ||
a90917c3 | 4115 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
4116 | if (ret) |
4117 | goto end; | |
4118 | ||
c099397a | 4119 | skip_session: |
f7d06400 MD |
4120 | list_for_each_entry(chan_priv, &session->priv->chan, node) { |
4121 | ret = _lttng_channel_metadata_statedump(session, chan_priv->pub); | |
c099397a MD |
4122 | if (ret) |
4123 | goto end; | |
4124 | } | |
4125 | ||
f237aef8 | 4126 | list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { |
a67ba386 MD |
4127 | ret = _lttng_event_metadata_statedump(session, event_recorder_priv->pub->chan, |
4128 | event_recorder_priv->pub); | |
c099397a MD |
4129 | if (ret) |
4130 | goto end; | |
4131 | } | |
8cdc1a81 | 4132 | session->priv->metadata_dumped = 1; |
c099397a | 4133 | end: |
8b97fd42 | 4134 | lttng_metadata_end(session); |
c099397a MD |
4135 | return ret; |
4136 | } | |
4137 | ||
c0e31d2e | 4138 | /** |
a90917c3 | 4139 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
4140 | * @transport: transport structure |
4141 | * | |
4142 | * Registers a transport which can be used as output to extract the data out of | |
4143 | * LTTng. The module calling this registration function must ensure that no | |
4144 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 4145 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 4146 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 4147 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
4148 | * after its registration must it synchronize the TLBs. |
4149 | */ | |
a90917c3 | 4150 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
4151 | { |
4152 | /* | |
4153 | * Make sure no page fault can be triggered by the module about to be | |
4154 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 4155 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 4156 | */ |
263b6c88 | 4157 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
4158 | |
4159 | mutex_lock(&sessions_mutex); | |
a90917c3 | 4160 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
4161 | mutex_unlock(&sessions_mutex); |
4162 | } | |
a90917c3 | 4163 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
4164 | |
4165 | /** | |
a90917c3 | 4166 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
4167 | * @transport: transport structure |
4168 | */ | |
a90917c3 | 4169 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
4170 | { |
4171 | mutex_lock(&sessions_mutex); | |
4172 | list_del(&transport->node); | |
4173 | mutex_unlock(&sessions_mutex); | |
4174 | } | |
a90917c3 | 4175 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 4176 | |
a101fa10 MD |
4177 | void lttng_counter_transport_register(struct lttng_counter_transport *transport) |
4178 | { | |
4179 | /* | |
4180 | * Make sure no page fault can be triggered by the module about to be | |
4181 | * registered. We deal with this here so we don't have to call | |
4182 | * vmalloc_sync_mappings() in each module's init. | |
4183 | */ | |
4184 | wrapper_vmalloc_sync_mappings(); | |
4185 | ||
4186 | mutex_lock(&sessions_mutex); | |
4187 | list_add_tail(&transport->node, <tng_counter_transport_list); | |
4188 | mutex_unlock(&sessions_mutex); | |
4189 | } | |
4190 | EXPORT_SYMBOL_GPL(lttng_counter_transport_register); | |
4191 | ||
4192 | void lttng_counter_transport_unregister(struct lttng_counter_transport *transport) | |
4193 | { | |
4194 | mutex_lock(&sessions_mutex); | |
4195 | list_del(&transport->node); | |
4196 | mutex_unlock(&sessions_mutex); | |
4197 | } | |
4198 | EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister); | |
4199 | ||
5f4c791e | 4200 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) |
1e367326 MD |
4201 | |
4202 | enum cpuhp_state lttng_hp_prepare; | |
4203 | enum cpuhp_state lttng_hp_online; | |
4204 | ||
4205 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
4206 | { | |
4207 | struct lttng_cpuhp_node *lttng_node; | |
4208 | ||
4209 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4210 | switch (lttng_node->component) { | |
4211 | case LTTNG_RING_BUFFER_FRONTEND: | |
4212 | return 0; | |
4213 | case LTTNG_RING_BUFFER_BACKEND: | |
4214 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
4215 | case LTTNG_RING_BUFFER_ITER: | |
4216 | return 0; | |
4217 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4218 | return 0; | |
4219 | default: | |
4220 | return -EINVAL; | |
4221 | } | |
4222 | } | |
4223 | ||
4224 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
4225 | { | |
4226 | struct lttng_cpuhp_node *lttng_node; | |
4227 | ||
4228 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4229 | switch (lttng_node->component) { | |
4230 | case LTTNG_RING_BUFFER_FRONTEND: | |
4231 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
4232 | case LTTNG_RING_BUFFER_BACKEND: | |
4233 | return 0; | |
4234 | case LTTNG_RING_BUFFER_ITER: | |
4235 | return 0; | |
4236 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4237 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
4238 | default: | |
4239 | return -EINVAL; | |
4240 | } | |
4241 | } | |
4242 | ||
4243 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
4244 | { | |
4245 | struct lttng_cpuhp_node *lttng_node; | |
4246 | ||
4247 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4248 | switch (lttng_node->component) { | |
4249 | case LTTNG_RING_BUFFER_FRONTEND: | |
4250 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
4251 | case LTTNG_RING_BUFFER_BACKEND: | |
4252 | return 0; | |
4253 | case LTTNG_RING_BUFFER_ITER: | |
4254 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
4255 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4256 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
4257 | default: | |
4258 | return -EINVAL; | |
4259 | } | |
4260 | } | |
4261 | ||
4262 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
4263 | { | |
4264 | struct lttng_cpuhp_node *lttng_node; | |
4265 | ||
4266 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
4267 | switch (lttng_node->component) { | |
4268 | case LTTNG_RING_BUFFER_FRONTEND: | |
4269 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
4270 | case LTTNG_RING_BUFFER_BACKEND: | |
4271 | return 0; | |
4272 | case LTTNG_RING_BUFFER_ITER: | |
4273 | return 0; | |
4274 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
4275 | return 0; | |
4276 | default: | |
4277 | return -EINVAL; | |
4278 | } | |
4279 | } | |
4280 | ||
4281 | static int __init lttng_init_cpu_hotplug(void) | |
4282 | { | |
4283 | int ret; | |
4284 | ||
4285 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
4286 | lttng_hotplug_prepare, | |
4287 | lttng_hotplug_dead); | |
4288 | if (ret < 0) { | |
4289 | return ret; | |
4290 | } | |
4291 | lttng_hp_prepare = ret; | |
4292 | lttng_rb_set_hp_prepare(ret); | |
4293 | ||
4294 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
4295 | lttng_hotplug_online, | |
4296 | lttng_hotplug_offline); | |
4297 | if (ret < 0) { | |
4298 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4299 | lttng_hp_prepare = 0; | |
4300 | return ret; | |
4301 | } | |
4302 | lttng_hp_online = ret; | |
4303 | lttng_rb_set_hp_online(ret); | |
4304 | ||
4305 | return 0; | |
4306 | } | |
4307 | ||
4308 | static void __exit lttng_exit_cpu_hotplug(void) | |
4309 | { | |
4310 | lttng_rb_set_hp_online(0); | |
4311 | cpuhp_remove_multi_state(lttng_hp_online); | |
4312 | lttng_rb_set_hp_prepare(0); | |
4313 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
4314 | } | |
4315 | ||
5f4c791e | 4316 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
4317 | static int lttng_init_cpu_hotplug(void) |
4318 | { | |
4319 | return 0; | |
4320 | } | |
4321 | static void lttng_exit_cpu_hotplug(void) | |
4322 | { | |
4323 | } | |
5f4c791e | 4324 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ |
1e367326 | 4325 | |
a90917c3 | 4326 | static int __init lttng_events_init(void) |
4e3c1b9b | 4327 | { |
1c25284c MD |
4328 | int ret; |
4329 | ||
453b2495 JD |
4330 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
4331 | if (ret) | |
4332 | return ret; | |
389d7070 | 4333 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
4334 | if (ret) |
4335 | return ret; | |
4336 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
4337 | if (ret) |
4338 | return ret; | |
4339 | ret = lttng_probes_init(); | |
389d7070 MD |
4340 | if (ret) |
4341 | return ret; | |
07dfc1d0 | 4342 | ret = lttng_context_init(); |
20591cf7 MD |
4343 | if (ret) |
4344 | return ret; | |
07dfc1d0 MD |
4345 | ret = lttng_tracepoint_init(); |
4346 | if (ret) | |
4347 | goto error_tp; | |
a67ba386 MD |
4348 | event_recorder_cache = KMEM_CACHE(lttng_kernel_event_recorder, 0); |
4349 | if (!event_recorder_cache) { | |
20591cf7 | 4350 | ret = -ENOMEM; |
a67ba386 | 4351 | goto error_kmem_event_recorder; |
dffef45d | 4352 | } |
a67ba386 MD |
4353 | event_recorder_private_cache = KMEM_CACHE(lttng_kernel_event_recorder_private, 0); |
4354 | if (!event_recorder_private_cache) { | |
4355 | ret = -ENOMEM; | |
4356 | goto error_kmem_event_recorder_private; | |
4357 | } | |
4358 | event_notifier_cache = KMEM_CACHE(lttng_kernel_event_notifier, 0); | |
dffef45d FD |
4359 | if (!event_notifier_cache) { |
4360 | ret = -ENOMEM; | |
4361 | goto error_kmem_event_notifier; | |
20591cf7 | 4362 | } |
a67ba386 MD |
4363 | event_notifier_private_cache = KMEM_CACHE(lttng_kernel_event_notifier_private, 0); |
4364 | if (!event_notifier_private_cache) { | |
4365 | ret = -ENOMEM; | |
4366 | goto error_kmem_event_notifier_private; | |
4367 | } | |
80996790 | 4368 | ret = lttng_abi_init(); |
02119ee5 MD |
4369 | if (ret) |
4370 | goto error_abi; | |
0c956676 MD |
4371 | ret = lttng_logger_init(); |
4372 | if (ret) | |
4373 | goto error_logger; | |
1e367326 MD |
4374 | ret = lttng_init_cpu_hotplug(); |
4375 | if (ret) | |
4376 | goto error_hotplug; | |
101215b7 | 4377 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4378 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4379 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4380 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4381 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4382 | LTTNG_VERSION_NAME, |
4383 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4384 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4385 | #else | |
4386 | "", | |
4387 | #endif | |
4388 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4389 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4390 | #else | |
4391 | ""); | |
4392 | #endif | |
c1551e57 MJ |
4393 | #ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM |
4394 | printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); | |
4395 | #endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ | |
4e3c1b9b | 4396 | return 0; |
0c956676 | 4397 | |
1e367326 MD |
4398 | error_hotplug: |
4399 | lttng_logger_exit(); | |
0c956676 MD |
4400 | error_logger: |
4401 | lttng_abi_exit(); | |
02119ee5 | 4402 | error_abi: |
a67ba386 MD |
4403 | kmem_cache_destroy(event_notifier_private_cache); |
4404 | error_kmem_event_notifier_private: | |
dffef45d FD |
4405 | kmem_cache_destroy(event_notifier_cache); |
4406 | error_kmem_event_notifier: | |
a67ba386 MD |
4407 | kmem_cache_destroy(event_recorder_private_cache); |
4408 | error_kmem_event_recorder_private: | |
4409 | kmem_cache_destroy(event_recorder_cache); | |
4410 | error_kmem_event_recorder: | |
20591cf7 | 4411 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
4412 | error_tp: |
4413 | lttng_context_exit(); | |
101215b7 | 4414 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4415 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4416 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4417 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4418 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4419 | LTTNG_VERSION_NAME, |
4420 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4421 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4422 | #else | |
4423 | "", | |
4424 | #endif | |
4425 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4426 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4427 | #else | |
4428 | ""); | |
4429 | #endif | |
1c25284c | 4430 | return ret; |
4e3c1b9b MD |
4431 | } |
4432 | ||
a90917c3 | 4433 | module_init(lttng_events_init); |
11b5a3c2 | 4434 | |
a90917c3 | 4435 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 4436 | { |
8cdc1a81 | 4437 | struct lttng_kernel_session_private *session_priv, *tmpsession_priv; |
92e94819 | 4438 | |
1e367326 | 4439 | lttng_exit_cpu_hotplug(); |
0c956676 | 4440 | lttng_logger_exit(); |
80996790 | 4441 | lttng_abi_exit(); |
8cdc1a81 MD |
4442 | list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, list) |
4443 | lttng_session_destroy(session_priv->pub); | |
a67ba386 MD |
4444 | kmem_cache_destroy(event_recorder_cache); |
4445 | kmem_cache_destroy(event_recorder_private_cache); | |
dffef45d | 4446 | kmem_cache_destroy(event_notifier_cache); |
a67ba386 | 4447 | kmem_cache_destroy(event_notifier_private_cache); |
20591cf7 | 4448 | lttng_tracepoint_exit(); |
07dfc1d0 | 4449 | lttng_context_exit(); |
101215b7 | 4450 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
4451 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
4452 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
4453 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
4454 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
4455 | LTTNG_VERSION_NAME, |
4456 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
4457 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
4458 | #else | |
4459 | "", | |
4460 | #endif | |
4461 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4462 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
4463 | #else | |
4464 | ""); | |
4465 | #endif | |
4e3c1b9b | 4466 | } |
92e94819 | 4467 | |
a90917c3 | 4468 | module_exit(lttng_events_exit); |
11b5a3c2 | 4469 | |
7ca11e77 | 4470 | #include <generated/patches.h> |
101215b7 MJ |
4471 | #ifdef LTTNG_EXTRA_VERSION_GIT |
4472 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
4473 | #endif | |
4474 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
4475 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
4476 | #endif | |
92e94819 MD |
4477 | MODULE_LICENSE("GPL and additional rights"); |
4478 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 4479 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
4480 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
4481 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
4482 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
4483 | LTTNG_MODULES_EXTRAVERSION); |