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