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