Commit | Line | Data |
---|---|---|
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 | |
a7008254 | 31 | #include <wrapper/uuid.h> |
263b6c88 | 32 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
33 | #include <wrapper/random.h> |
34 | #include <wrapper/tracepoint.h> | |
35 | #include <wrapper/list.h> | |
cbc19040 | 36 | #include <wrapper/types.h> |
2df37e95 MD |
37 | #include <lttng/kernel-version.h> |
38 | #include <lttng/events.h> | |
39 | #include <lttng/tracer.h> | |
21f58fb7 | 40 | #include <lttng/event-notifier-notification.h> |
2df37e95 MD |
41 | #include <lttng/abi-old.h> |
42 | #include <lttng/endian.h> | |
43 | #include <lttng/string-utils.h> | |
4a11ef1c | 44 | #include <lttng/utils.h> |
24591303 MD |
45 | #include <ringbuffer/backend.h> |
46 | #include <ringbuffer/frontend.h> | |
3636085f | 47 | #include <wrapper/time.h> |
4e3c1b9b | 48 | |
d83004aa JD |
49 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
50 | ||
4e3c1b9b | 51 | static LIST_HEAD(sessions); |
750b05f2 | 52 | static LIST_HEAD(event_notifier_groups); |
a90917c3 | 53 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
54 | /* |
55 | * Protect the sessions and metadata caches. | |
56 | */ | |
4e3c1b9b MD |
57 | static DEFINE_MUTEX(sessions_mutex); |
58 | static struct kmem_cache *event_cache; | |
dffef45d | 59 | static struct kmem_cache *event_notifier_cache; |
4e3c1b9b | 60 | |
b2bc0bc8 FD |
61 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
62 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
63 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
dffef45d | 64 | static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler); |
b01155ba | 65 | static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group); |
3c997079 | 66 | |
a90917c3 | 67 | static void _lttng_event_destroy(struct lttng_event *event); |
dffef45d | 68 | static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier); |
a90917c3 MD |
69 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
70 | static int _lttng_event_unregister(struct lttng_event *event); | |
dffef45d | 71 | static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier); |
c099397a | 72 | static |
a90917c3 MD |
73 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
74 | struct lttng_channel *chan, | |
75 | struct lttng_event *event); | |
c099397a | 76 | static |
a90917c3 | 77 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
78 | static |
79 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 80 | static |
ceabb767 MD |
81 | int _lttng_type_statedump(struct lttng_session *session, |
82 | const struct lttng_type *type, | |
83 | size_t nesting); | |
84 | static | |
f513b2bf MD |
85 | int _lttng_field_statedump(struct lttng_session *session, |
86 | const struct lttng_event_field *field, | |
87 | size_t nesting); | |
c099397a | 88 | |
c099397a | 89 | void synchronize_trace(void) |
abcca994 | 90 | { |
92da05ce MJ |
91 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
92 | synchronize_rcu(); | |
93 | #else | |
abcca994 | 94 | synchronize_sched(); |
92da05ce MJ |
95 | #endif |
96 | ||
b8590f40 MD |
97 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
98 | #ifdef CONFIG_PREEMPT_RT_FULL | |
99 | synchronize_rcu(); | |
100 | #endif | |
101 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
102 | #ifdef CONFIG_PREEMPT_RT |
103 | synchronize_rcu(); | |
104 | #endif | |
b8590f40 | 105 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
106 | } |
107 | ||
3c997079 MD |
108 | void lttng_lock_sessions(void) |
109 | { | |
110 | mutex_lock(&sessions_mutex); | |
111 | } | |
112 | ||
113 | void lttng_unlock_sessions(void) | |
114 | { | |
115 | mutex_unlock(&sessions_mutex); | |
116 | } | |
117 | ||
9fe593d2 FD |
118 | static struct lttng_transport *lttng_transport_find(const char *name) |
119 | { | |
120 | struct lttng_transport *transport; | |
121 | ||
122 | list_for_each_entry(transport, <tng_transport_list, node) { | |
123 | if (!strcmp(transport->name, name)) | |
124 | return transport; | |
125 | } | |
126 | return NULL; | |
127 | } | |
128 | ||
3c997079 MD |
129 | /* |
130 | * Called with sessions lock held. | |
131 | */ | |
132 | int lttng_session_active(void) | |
133 | { | |
134 | struct lttng_session *iter; | |
135 | ||
136 | list_for_each_entry(iter, &sessions, list) { | |
137 | if (iter->active) | |
138 | return 1; | |
139 | } | |
140 | return 0; | |
141 | } | |
142 | ||
a90917c3 | 143 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 144 | { |
a90917c3 | 145 | struct lttng_session *session; |
d83004aa | 146 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 147 | int i; |
4e3c1b9b MD |
148 | |
149 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 150 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 151 | if (!session) |
d83004aa | 152 | goto err; |
4e3c1b9b | 153 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 154 | INIT_LIST_HEAD(&session->events); |
a7008254 | 155 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
156 | |
157 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
158 | GFP_KERNEL); | |
159 | if (!metadata_cache) | |
160 | goto err_free_session; | |
0ca42eb7 | 161 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
162 | if (!metadata_cache->data) |
163 | goto err_free_cache; | |
164 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
165 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 166 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
167 | session->metadata_cache = metadata_cache; |
168 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
169 | memcpy(&metadata_cache->uuid, &session->uuid, |
170 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
171 | INIT_LIST_HEAD(&session->enablers_head); |
172 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
173 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 174 | list_add(&session->list, &sessions); |
d1f652f8 MD |
175 | session->pid_tracker.session = session; |
176 | session->pid_tracker.tracker_type = TRACKER_PID; | |
177 | session->vpid_tracker.session = session; | |
178 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
179 | session->uid_tracker.session = session; | |
180 | session->uid_tracker.tracker_type = TRACKER_UID; | |
181 | session->vuid_tracker.session = session; | |
182 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
183 | session->gid_tracker.session = session; | |
184 | session->gid_tracker.tracker_type = TRACKER_GID; | |
185 | session->vgid_tracker.session = session; | |
186 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
187 | mutex_unlock(&sessions_mutex); |
188 | return session; | |
d83004aa JD |
189 | |
190 | err_free_cache: | |
191 | kfree(metadata_cache); | |
192 | err_free_session: | |
48f5e0b5 | 193 | lttng_kvfree(session); |
d83004aa JD |
194 | err: |
195 | mutex_unlock(&sessions_mutex); | |
196 | return NULL; | |
197 | } | |
198 | ||
750b05f2 FD |
199 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
200 | { | |
201 | struct lttng_transport *transport = NULL; | |
202 | struct lttng_event_notifier_group *event_notifier_group; | |
203 | const char *transport_name = "relay-event-notifier"; | |
204 | size_t subbuf_size = 4096; //TODO | |
205 | size_t num_subbuf = 16; //TODO | |
206 | unsigned int switch_timer_interval = 0; | |
207 | unsigned int read_timer_interval = 0; | |
dffef45d | 208 | int i; |
750b05f2 FD |
209 | |
210 | mutex_lock(&sessions_mutex); | |
211 | ||
212 | transport = lttng_transport_find(transport_name); | |
213 | if (!transport) { | |
214 | printk(KERN_WARNING "LTTng: transport %s not found\n", | |
215 | transport_name); | |
216 | goto notransport; | |
217 | } | |
218 | if (!try_module_get(transport->owner)) { | |
219 | printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n", | |
220 | transport_name); | |
221 | goto notransport; | |
222 | } | |
223 | ||
224 | event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group), | |
225 | GFP_KERNEL); | |
226 | if (!event_notifier_group) | |
227 | goto nomem; | |
228 | ||
229 | /* | |
230 | * Initialize the ring buffer used to store event notifier | |
231 | * notifications. | |
232 | */ | |
233 | event_notifier_group->ops = &transport->ops; | |
234 | event_notifier_group->chan = transport->ops.channel_create( | |
235 | transport_name, event_notifier_group, NULL, | |
236 | subbuf_size, num_subbuf, switch_timer_interval, | |
237 | read_timer_interval); | |
238 | if (!event_notifier_group->chan) | |
239 | goto create_error; | |
240 | ||
241 | event_notifier_group->transport = transport; | |
dffef45d FD |
242 | |
243 | INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
244 | INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
245 | for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++) | |
246 | INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
247 | ||
750b05f2 FD |
248 | list_add(&event_notifier_group->node, &event_notifier_groups); |
249 | ||
250 | mutex_unlock(&sessions_mutex); | |
251 | ||
252 | return event_notifier_group; | |
253 | ||
254 | create_error: | |
255 | lttng_kvfree(event_notifier_group); | |
256 | nomem: | |
257 | if (transport) | |
258 | module_put(transport->owner); | |
259 | notransport: | |
260 | mutex_unlock(&sessions_mutex); | |
261 | return NULL; | |
262 | } | |
263 | ||
d83004aa JD |
264 | void metadata_cache_destroy(struct kref *kref) |
265 | { | |
266 | struct lttng_metadata_cache *cache = | |
267 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 268 | vfree(cache->data); |
d83004aa | 269 | kfree(cache); |
4e3c1b9b MD |
270 | } |
271 | ||
a90917c3 | 272 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 273 | { |
a90917c3 MD |
274 | struct lttng_channel *chan, *tmpchan; |
275 | struct lttng_event *event, *tmpevent; | |
d83004aa | 276 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 277 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 278 | int ret; |
4e3c1b9b MD |
279 | |
280 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 281 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
282 | list_for_each_entry(chan, &session->chan, list) { |
283 | ret = lttng_syscalls_unregister(chan); | |
284 | WARN_ON(ret); | |
285 | } | |
dda6a249 | 286 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 287 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
288 | WARN_ON(ret); |
289 | } | |
abcca994 | 290 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 MD |
291 | list_for_each_entry(chan, &session->chan, list) { |
292 | ret = lttng_syscalls_destroy(chan); | |
293 | WARN_ON(ret); | |
294 | } | |
b2bc0bc8 | 295 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 296 | &session->enablers_head, node) |
b2bc0bc8 | 297 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 298 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 299 | _lttng_event_destroy(event); |
d83004aa JD |
300 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
301 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 302 | _lttng_channel_destroy(chan); |
d83004aa | 303 | } |
ab036a63 | 304 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
305 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
306 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 307 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
308 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
309 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
310 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
311 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
312 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
313 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 314 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
315 | list_del(&session->list); |
316 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 317 | lttng_kvfree(session); |
4e3c1b9b MD |
318 | } |
319 | ||
dffef45d FD |
320 | void lttng_event_notifier_group_destroy( |
321 | struct lttng_event_notifier_group *event_notifier_group) | |
750b05f2 | 322 | { |
dffef45d FD |
323 | struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler; |
324 | struct lttng_event_notifier *event_notifier, *tmpevent_notifier; | |
325 | int ret; | |
326 | ||
750b05f2 FD |
327 | if (!event_notifier_group) |
328 | return; | |
329 | ||
330 | mutex_lock(&sessions_mutex); | |
dffef45d FD |
331 | |
332 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
333 | &event_notifier_group->event_notifiers_head, list) { | |
334 | ret = _lttng_event_notifier_unregister(event_notifier); | |
335 | WARN_ON(ret); | |
336 | } | |
337 | ||
b01155ba FD |
338 | /* Wait for in-flight event notifier to complete */ |
339 | synchronize_trace(); | |
340 | ||
21f58fb7 FD |
341 | irq_work_sync(&event_notifier_group->wakeup_pending); |
342 | ||
dffef45d FD |
343 | list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler, |
344 | &event_notifier_group->enablers_head, node) | |
345 | lttng_event_notifier_enabler_destroy(event_notifier_enabler); | |
346 | ||
347 | list_for_each_entry_safe(event_notifier, tmpevent_notifier, | |
348 | &event_notifier_group->event_notifiers_head, list) | |
349 | _lttng_event_notifier_destroy(event_notifier); | |
350 | ||
750b05f2 FD |
351 | event_notifier_group->ops->channel_destroy(event_notifier_group->chan); |
352 | module_put(event_notifier_group->transport->owner); | |
353 | list_del(&event_notifier_group->node); | |
dffef45d | 354 | |
750b05f2 FD |
355 | mutex_unlock(&sessions_mutex); |
356 | lttng_kvfree(event_notifier_group); | |
357 | } | |
358 | ||
601252cf MD |
359 | int lttng_session_statedump(struct lttng_session *session) |
360 | { | |
361 | int ret; | |
362 | ||
363 | mutex_lock(&sessions_mutex); | |
364 | ret = lttng_statedump_start(session); | |
365 | mutex_unlock(&sessions_mutex); | |
366 | return ret; | |
367 | } | |
368 | ||
a90917c3 | 369 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
370 | { |
371 | int ret = 0; | |
a90917c3 | 372 | struct lttng_channel *chan; |
c0e31d2e MD |
373 | |
374 | mutex_lock(&sessions_mutex); | |
375 | if (session->active) { | |
376 | ret = -EBUSY; | |
377 | goto end; | |
378 | } | |
c099397a | 379 | |
3c997079 MD |
380 | /* Set transient enabler state to "enabled" */ |
381 | session->tstate = 1; | |
382 | ||
4ef81e4a | 383 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 384 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 385 | |
c099397a MD |
386 | /* |
387 | * Snapshot the number of events per channel to know the type of header | |
388 | * we need to use. | |
389 | */ | |
390 | list_for_each_entry(chan, &session->chan, list) { | |
391 | if (chan->header_type) | |
392 | continue; /* don't change it if session stop/restart */ | |
393 | if (chan->free_event_id < 31) | |
394 | chan->header_type = 1; /* compact */ | |
395 | else | |
396 | chan->header_type = 2; /* large */ | |
397 | } | |
398 | ||
64af2437 | 399 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
400 | list_for_each_entry(chan, &session->chan, list) { |
401 | if (chan->channel_type != METADATA_CHANNEL) | |
402 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
403 | } | |
64af2437 | 404 | |
a8f2d0c7 MJ |
405 | WRITE_ONCE(session->active, 1); |
406 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 407 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 408 | if (ret) { |
a8f2d0c7 | 409 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
410 | goto end; |
411 | } | |
412 | ret = lttng_statedump_start(session); | |
360f38ea | 413 | if (ret) |
a8f2d0c7 | 414 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
415 | end: |
416 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 417 | return ret; |
c0e31d2e MD |
418 | } |
419 | ||
a90917c3 | 420 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
421 | { |
422 | int ret = 0; | |
64af2437 | 423 | struct lttng_channel *chan; |
c0e31d2e MD |
424 | |
425 | mutex_lock(&sessions_mutex); | |
426 | if (!session->active) { | |
427 | ret = -EBUSY; | |
428 | goto end; | |
429 | } | |
a8f2d0c7 | 430 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
431 | |
432 | /* Set transient enabler state to "disabled" */ | |
433 | session->tstate = 0; | |
b2bc0bc8 | 434 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
435 | |
436 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
437 | list_for_each_entry(chan, &session->chan, list) { |
438 | if (chan->channel_type != METADATA_CHANNEL) | |
439 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
440 | } | |
c0e31d2e MD |
441 | end: |
442 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 443 | return ret; |
c0e31d2e MD |
444 | } |
445 | ||
9616f0bf JD |
446 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
447 | { | |
448 | int ret = 0; | |
449 | struct lttng_channel *chan; | |
450 | struct lttng_event *event; | |
451 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
452 | struct lttng_metadata_stream *stream; | |
453 | ||
454 | mutex_lock(&sessions_mutex); | |
455 | if (!session->active) { | |
456 | ret = -EBUSY; | |
457 | goto end; | |
458 | } | |
459 | ||
460 | mutex_lock(&cache->lock); | |
461 | memset(cache->data, 0, cache->cache_alloc); | |
462 | cache->metadata_written = 0; | |
463 | cache->version++; | |
464 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
465 | stream->metadata_out = 0; | |
466 | stream->metadata_in = 0; | |
467 | } | |
468 | mutex_unlock(&cache->lock); | |
469 | ||
470 | session->metadata_dumped = 0; | |
471 | list_for_each_entry(chan, &session->chan, list) { | |
472 | chan->metadata_dumped = 0; | |
473 | } | |
474 | ||
475 | list_for_each_entry(event, &session->events, list) { | |
476 | event->metadata_dumped = 0; | |
477 | } | |
478 | ||
479 | ret = _lttng_session_metadata_statedump(session); | |
480 | ||
481 | end: | |
482 | mutex_unlock(&sessions_mutex); | |
483 | return ret; | |
484 | } | |
485 | ||
a90917c3 | 486 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 487 | { |
3c997079 | 488 | int ret = 0; |
e64957da | 489 | |
3c997079 MD |
490 | mutex_lock(&sessions_mutex); |
491 | if (channel->channel_type == METADATA_CHANNEL) { | |
492 | ret = -EPERM; | |
493 | goto end; | |
494 | } | |
495 | if (channel->enabled) { | |
496 | ret = -EEXIST; | |
497 | goto end; | |
498 | } | |
499 | /* Set transient enabler state to "enabled" */ | |
500 | channel->tstate = 1; | |
b2bc0bc8 | 501 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 502 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 503 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
504 | end: |
505 | mutex_unlock(&sessions_mutex); | |
506 | return ret; | |
e64957da MD |
507 | } |
508 | ||
a90917c3 | 509 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 510 | { |
3c997079 | 511 | int ret = 0; |
e64957da | 512 | |
3c997079 MD |
513 | mutex_lock(&sessions_mutex); |
514 | if (channel->channel_type == METADATA_CHANNEL) { | |
515 | ret = -EPERM; | |
516 | goto end; | |
517 | } | |
518 | if (!channel->enabled) { | |
519 | ret = -EEXIST; | |
520 | goto end; | |
521 | } | |
522 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 523 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
524 | /* Set transient enabler state to "enabled" */ |
525 | channel->tstate = 0; | |
b2bc0bc8 | 526 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
527 | end: |
528 | mutex_unlock(&sessions_mutex); | |
529 | return ret; | |
e64957da MD |
530 | } |
531 | ||
a90917c3 | 532 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 533 | { |
3c997079 | 534 | int ret = 0; |
e64957da | 535 | |
3c997079 MD |
536 | mutex_lock(&sessions_mutex); |
537 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
538 | ret = -EPERM; | |
539 | goto end; | |
540 | } | |
541 | if (event->enabled) { | |
542 | ret = -EEXIST; | |
543 | goto end; | |
544 | } | |
a0493bef MD |
545 | switch (event->instrumentation) { |
546 | case LTTNG_KERNEL_TRACEPOINT: | |
547 | case LTTNG_KERNEL_SYSCALL: | |
548 | ret = -EINVAL; | |
549 | break; | |
550 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 551 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 552 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 553 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
554 | break; |
555 | case LTTNG_KERNEL_KRETPROBE: | |
556 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
557 | break; | |
e884017c | 558 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
559 | default: |
560 | WARN_ON_ONCE(1); | |
561 | ret = -EINVAL; | |
562 | } | |
3c997079 MD |
563 | end: |
564 | mutex_unlock(&sessions_mutex); | |
565 | return ret; | |
e64957da MD |
566 | } |
567 | ||
a90917c3 | 568 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 569 | { |
3c997079 | 570 | int ret = 0; |
e64957da | 571 | |
3c997079 MD |
572 | mutex_lock(&sessions_mutex); |
573 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
574 | ret = -EPERM; | |
575 | goto end; | |
576 | } | |
577 | if (!event->enabled) { | |
578 | ret = -EEXIST; | |
579 | goto end; | |
580 | } | |
a0493bef MD |
581 | switch (event->instrumentation) { |
582 | case LTTNG_KERNEL_TRACEPOINT: | |
583 | case LTTNG_KERNEL_SYSCALL: | |
584 | ret = -EINVAL; | |
585 | break; | |
586 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 587 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 588 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 589 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
590 | break; |
591 | case LTTNG_KERNEL_KRETPROBE: | |
592 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
593 | break; | |
e884017c | 594 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
595 | default: |
596 | WARN_ON_ONCE(1); | |
597 | ret = -EINVAL; | |
598 | } | |
3c997079 MD |
599 | end: |
600 | mutex_unlock(&sessions_mutex); | |
601 | return ret; | |
e64957da MD |
602 | } |
603 | ||
dffef45d FD |
604 | int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier) |
605 | { | |
606 | int ret = 0; | |
607 | ||
608 | mutex_lock(&sessions_mutex); | |
609 | if (event_notifier->enabled) { | |
610 | ret = -EEXIST; | |
611 | goto end; | |
612 | } | |
613 | switch (event_notifier->instrumentation) { | |
614 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
615 | ret = -EINVAL; |
616 | break; | |
dffef45d FD |
617 | case LTTNG_KERNEL_SYSCALL: |
618 | case LTTNG_KERNEL_KPROBE: | |
619 | case LTTNG_KERNEL_FUNCTION: | |
620 | case LTTNG_KERNEL_UPROBE: | |
621 | case LTTNG_KERNEL_NOOP: | |
622 | case LTTNG_KERNEL_KRETPROBE: | |
623 | default: | |
624 | WARN_ON_ONCE(1); | |
625 | ret = -EINVAL; | |
626 | } | |
627 | end: | |
628 | mutex_unlock(&sessions_mutex); | |
629 | return ret; | |
630 | } | |
631 | ||
632 | int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier) | |
633 | { | |
634 | int ret = 0; | |
635 | ||
636 | mutex_lock(&sessions_mutex); | |
637 | if (!event_notifier->enabled) { | |
638 | ret = -EEXIST; | |
639 | goto end; | |
640 | } | |
641 | switch (event_notifier->instrumentation) { | |
642 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
643 | ret = -EINVAL; |
644 | break; | |
dffef45d FD |
645 | case LTTNG_KERNEL_SYSCALL: |
646 | case LTTNG_KERNEL_KPROBE: | |
647 | case LTTNG_KERNEL_FUNCTION: | |
648 | case LTTNG_KERNEL_UPROBE: | |
649 | case LTTNG_KERNEL_NOOP: | |
650 | case LTTNG_KERNEL_KRETPROBE: | |
651 | default: | |
652 | WARN_ON_ONCE(1); | |
653 | ret = -EINVAL; | |
654 | } | |
655 | end: | |
656 | mutex_unlock(&sessions_mutex); | |
657 | return ret; | |
658 | } | |
659 | ||
a90917c3 | 660 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
661 | const char *transport_name, |
662 | void *buf_addr, | |
4e3c1b9b MD |
663 | size_t subbuf_size, size_t num_subbuf, |
664 | unsigned int switch_timer_interval, | |
d83004aa JD |
665 | unsigned int read_timer_interval, |
666 | enum channel_type channel_type) | |
4e3c1b9b | 667 | { |
a90917c3 MD |
668 | struct lttng_channel *chan; |
669 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
670 | |
671 | mutex_lock(&sessions_mutex); | |
d83004aa | 672 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 673 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 674 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 675 | if (!transport) { |
5a15f70c | 676 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 677 | transport_name); |
c0e31d2e | 678 | goto notransport; |
f3d01b96 | 679 | } |
a33c9927 | 680 | if (!try_module_get(transport->owner)) { |
5a15f70c | 681 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
682 | goto notransport; |
683 | } | |
a90917c3 | 684 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 685 | if (!chan) |
c0e31d2e | 686 | goto nomem; |
4e3c1b9b | 687 | chan->session = session; |
05d32c64 | 688 | chan->id = session->free_chan_id++; |
3b731ab1 | 689 | chan->ops = &transport->ops; |
125b4df4 MD |
690 | /* |
691 | * Note: the channel creation op already writes into the packet | |
692 | * headers. Therefore the "chan" information used as input | |
693 | * should be already accessible. | |
694 | */ | |
5f5ddf01 MD |
695 | chan->chan = transport->ops.channel_create(transport_name, |
696 | chan, buf_addr, subbuf_size, num_subbuf, | |
697 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
698 | if (!chan->chan) |
699 | goto create_error; | |
3c997079 | 700 | chan->tstate = 1; |
e64957da | 701 | chan->enabled = 1; |
a33c9927 | 702 | chan->transport = transport; |
d83004aa | 703 | chan->channel_type = channel_type; |
4e3c1b9b MD |
704 | list_add(&chan->list, &session->chan); |
705 | mutex_unlock(&sessions_mutex); | |
706 | return chan; | |
707 | ||
f3d01b96 MD |
708 | create_error: |
709 | kfree(chan); | |
c0e31d2e | 710 | nomem: |
a33c9927 MD |
711 | if (transport) |
712 | module_put(transport->owner); | |
c0e31d2e | 713 | notransport: |
e5382b6d | 714 | active: |
4e3c1b9b MD |
715 | mutex_unlock(&sessions_mutex); |
716 | return NULL; | |
717 | } | |
718 | ||
719 | /* | |
d83004aa JD |
720 | * Only used internally at session destruction for per-cpu channels, and |
721 | * when metadata channel is released. | |
722 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 723 | */ |
aa7c23a9 | 724 | static |
a90917c3 | 725 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 726 | { |
11b5a3c2 | 727 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 728 | module_put(chan->transport->owner); |
4e3c1b9b | 729 | list_del(&chan->list); |
8070f5c0 | 730 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
731 | kfree(chan); |
732 | } | |
733 | ||
d83004aa JD |
734 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
735 | { | |
736 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
737 | ||
738 | /* Protect the metadata cache with the sessions_mutex. */ | |
739 | mutex_lock(&sessions_mutex); | |
740 | _lttng_channel_destroy(chan); | |
741 | mutex_unlock(&sessions_mutex); | |
742 | } | |
743 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
744 | ||
745 | static | |
746 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
747 | { | |
748 | stream->finalized = 1; | |
749 | wake_up_interruptible(&stream->read_wait); | |
750 | } | |
751 | ||
e5382b6d MD |
752 | /* |
753 | * Supports event creation while tracing session is active. | |
3c997079 | 754 | * Needs to be called with sessions mutex held. |
e5382b6d | 755 | */ |
3c997079 MD |
756 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
757 | struct lttng_kernel_event *event_param, | |
758 | void *filter, | |
759 | const struct lttng_event_desc *event_desc, | |
760 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 761 | { |
3c997079 | 762 | struct lttng_session *session = chan->session; |
a90917c3 | 763 | struct lttng_event *event; |
3c997079 MD |
764 | const char *event_name; |
765 | struct hlist_head *head; | |
3d084699 | 766 | int ret; |
4e3c1b9b | 767 | |
abc0446a | 768 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 769 | ret = -EMFILE; |
e5382b6d | 770 | goto full; |
abc0446a | 771 | } |
3c997079 MD |
772 | |
773 | switch (itype) { | |
774 | case LTTNG_KERNEL_TRACEPOINT: | |
775 | event_name = event_desc->name; | |
776 | break; | |
777 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 778 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 779 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 780 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 781 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
782 | event_name = event_param->name; |
783 | break; | |
e884017c | 784 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
785 | default: |
786 | WARN_ON_ONCE(1); | |
787 | ret = -EINVAL; | |
788 | goto type_error; | |
789 | } | |
4a11ef1c FD |
790 | |
791 | head = utils_borrow_hash_table_bucket(session->events_ht.table, | |
792 | LTTNG_EVENT_HT_SIZE, event_name); | |
d216ecae | 793 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
794 | WARN_ON_ONCE(!event->desc); |
795 | if (!strncmp(event->desc->name, event_name, | |
796 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
797 | && chan == event->chan) { | |
798 | ret = -EEXIST; | |
799 | goto exist; | |
abc0446a MD |
800 | } |
801 | } | |
3c997079 | 802 | |
11b5a3c2 | 803 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 804 | if (!event) { |
4cf0bf51 | 805 | ret = -ENOMEM; |
4e3c1b9b | 806 | goto cache_error; |
abc0446a | 807 | } |
4e3c1b9b MD |
808 | event->chan = chan; |
809 | event->filter = filter; | |
e5382b6d | 810 | event->id = chan->free_event_id++; |
3c997079 MD |
811 | event->instrumentation = itype; |
812 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 813 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
814 | INIT_LIST_HEAD(&event->enablers_ref_head); |
815 | ||
816 | switch (itype) { | |
ab2277d6 | 817 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
818 | /* Event will be enabled by enabler sync. */ |
819 | event->enabled = 0; | |
820 | event->registered = 0; | |
0bcedee9 | 821 | event->desc = lttng_event_desc_get(event_name); |
abc0446a | 822 | if (!event->desc) { |
4cf0bf51 | 823 | ret = -ENOENT; |
d3dbe23c | 824 | goto register_error; |
abc0446a | 825 | } |
3c997079 MD |
826 | /* Populate lttng_event structure before event registration. */ |
827 | smp_wmb(); | |
baf20995 | 828 | break; |
ab2277d6 | 829 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
830 | /* |
831 | * Needs to be explicitly enabled after creation, since | |
832 | * we may want to apply filters. | |
833 | */ | |
834 | event->enabled = 0; | |
3c997079 MD |
835 | event->registered = 1; |
836 | /* | |
837 | * Populate lttng_event structure before event | |
838 | * registration. | |
839 | */ | |
840 | smp_wmb(); | |
8bf17deb | 841 | ret = lttng_kprobes_register_event(event_name, |
f17701fb MD |
842 | event_param->u.kprobe.symbol_name, |
843 | event_param->u.kprobe.offset, | |
844 | event_param->u.kprobe.addr, | |
845 | event); | |
abc0446a | 846 | if (ret) { |
4cf0bf51 | 847 | ret = -EINVAL; |
d6d808f3 | 848 | goto register_error; |
abc0446a | 849 | } |
edeb3137 MD |
850 | ret = try_module_get(event->desc->owner); |
851 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 852 | break; |
7371f44c MD |
853 | case LTTNG_KERNEL_KRETPROBE: |
854 | { | |
a90917c3 | 855 | struct lttng_event *event_return; |
7371f44c MD |
856 | |
857 | /* kretprobe defines 2 events */ | |
a0493bef MD |
858 | /* |
859 | * Needs to be explicitly enabled after creation, since | |
860 | * we may want to apply filters. | |
861 | */ | |
862 | event->enabled = 0; | |
3c997079 | 863 | event->registered = 1; |
7371f44c MD |
864 | event_return = |
865 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 866 | if (!event_return) { |
4cf0bf51 | 867 | ret = -ENOMEM; |
7371f44c | 868 | goto register_error; |
abc0446a | 869 | } |
7371f44c MD |
870 | event_return->chan = chan; |
871 | event_return->filter = filter; | |
872 | event_return->id = chan->free_event_id++; | |
a0493bef | 873 | event_return->enabled = 0; |
3c997079 MD |
874 | event_return->registered = 1; |
875 | event_return->instrumentation = itype; | |
7371f44c | 876 | /* |
a90917c3 | 877 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
878 | */ |
879 | smp_wmb(); | |
3c997079 | 880 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
881 | event_param->u.kretprobe.symbol_name, |
882 | event_param->u.kretprobe.offset, | |
883 | event_param->u.kretprobe.addr, | |
884 | event, event_return); | |
885 | if (ret) { | |
886 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 887 | ret = -EINVAL; |
7371f44c MD |
888 | goto register_error; |
889 | } | |
890 | /* Take 2 refs on the module: one per event. */ | |
891 | ret = try_module_get(event->desc->owner); | |
892 | WARN_ON_ONCE(!ret); | |
893 | ret = try_module_get(event->desc->owner); | |
894 | WARN_ON_ONCE(!ret); | |
a90917c3 | 895 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 896 | event_return); |
abc0446a | 897 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
898 | if (ret) { |
899 | kmem_cache_free(event_cache, event_return); | |
900 | module_put(event->desc->owner); | |
901 | module_put(event->desc->owner); | |
902 | goto statedump_error; | |
903 | } | |
904 | list_add(&event_return->list, &chan->session->events); | |
905 | break; | |
906 | } | |
1ec65de1 | 907 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 908 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
909 | /* |
910 | * Needs to be explicitly enabled after creation, since | |
911 | * we may want to apply filters. | |
912 | */ | |
913 | event->enabled = 0; | |
3c997079 MD |
914 | event->registered = 0; |
915 | event->desc = event_desc; | |
badfe9f5 MD |
916 | switch (event_param->u.syscall.entryexit) { |
917 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
918 | ret = -EINVAL; | |
919 | goto register_error; | |
920 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
921 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
922 | break; | |
923 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
924 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
925 | break; | |
926 | } | |
927 | switch (event_param->u.syscall.abi) { | |
928 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
929 | ret = -EINVAL; | |
930 | goto register_error; | |
931 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
932 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
933 | break; | |
934 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
935 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
936 | break; | |
937 | } | |
abc0446a | 938 | if (!event->desc) { |
4cf0bf51 | 939 | ret = -EINVAL; |
259b6cb3 | 940 | goto register_error; |
abc0446a | 941 | } |
1ec65de1 | 942 | break; |
149b9a9d | 943 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
944 | /* |
945 | * Needs to be explicitly enabled after creation, since | |
946 | * we may want to apply filters. | |
947 | */ | |
948 | event->enabled = 0; | |
949 | event->registered = 1; | |
3aed4dca | 950 | |
a344f64b FD |
951 | /* |
952 | * Populate lttng_event structure before event | |
953 | * registration. | |
954 | */ | |
955 | smp_wmb(); | |
149b9a9d YB |
956 | |
957 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 958 | event_param->u.uprobe.fd, |
149b9a9d YB |
959 | event); |
960 | if (ret) | |
961 | goto register_error; | |
962 | ret = try_module_get(event->desc->owner); | |
963 | WARN_ON_ONCE(!ret); | |
964 | break; | |
e884017c | 965 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
966 | default: |
967 | WARN_ON_ONCE(1); | |
4cf0bf51 | 968 | ret = -EINVAL; |
df07930b | 969 | goto register_error; |
baf20995 | 970 | } |
a90917c3 | 971 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
972 | WARN_ON_ONCE(ret > 0); |
973 | if (ret) { | |
c099397a | 974 | goto statedump_error; |
abc0446a | 975 | } |
3c997079 | 976 | hlist_add_head(&event->hlist, head); |
dda6a249 | 977 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
978 | return event; |
979 | ||
c099397a | 980 | statedump_error: |
259b6cb3 | 981 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 982 | register_error: |
11b5a3c2 | 983 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
984 | cache_error: |
985 | exist: | |
3c997079 | 986 | type_error: |
e5382b6d | 987 | full: |
4cf0bf51 | 988 | return ERR_PTR(ret); |
4e3c1b9b MD |
989 | } |
990 | ||
dffef45d FD |
991 | struct lttng_event_notifier *_lttng_event_notifier_create( |
992 | const struct lttng_event_desc *event_desc, | |
993 | uint64_t token, struct lttng_event_notifier_group *event_notifier_group, | |
994 | struct lttng_kernel_event_notifier *event_notifier_param, | |
995 | void *filter, enum lttng_kernel_instrumentation itype) | |
996 | { | |
997 | struct lttng_event_notifier *event_notifier; | |
998 | const char *event_name; | |
999 | struct hlist_head *head; | |
1000 | int ret; | |
1001 | ||
1002 | switch (itype) { | |
1003 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1004 | event_name = event_desc->name; |
1005 | break; | |
dffef45d FD |
1006 | case LTTNG_KERNEL_KPROBE: |
1007 | case LTTNG_KERNEL_UPROBE: | |
1008 | case LTTNG_KERNEL_KRETPROBE: | |
1009 | case LTTNG_KERNEL_FUNCTION: | |
1010 | case LTTNG_KERNEL_NOOP: | |
1011 | case LTTNG_KERNEL_SYSCALL: | |
1012 | default: | |
1013 | WARN_ON_ONCE(1); | |
1014 | ret = -EINVAL; | |
1015 | goto type_error; | |
1016 | } | |
1017 | ||
1018 | head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table, | |
1019 | LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name); | |
1020 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1021 | WARN_ON_ONCE(!event_notifier->desc); | |
1022 | if (!strncmp(event_notifier->desc->name, event_name, | |
1023 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
1024 | && event_notifier_group == event_notifier->group | |
1025 | && token == event_notifier->user_token) { | |
1026 | ret = -EEXIST; | |
1027 | goto exist; | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL); | |
1032 | if (!event_notifier) { | |
1033 | ret = -ENOMEM; | |
1034 | goto cache_error; | |
1035 | } | |
21f58fb7 | 1036 | |
dffef45d FD |
1037 | event_notifier->group = event_notifier_group; |
1038 | event_notifier->user_token = token; | |
1039 | event_notifier->filter = filter; | |
1040 | event_notifier->instrumentation = itype; | |
1041 | event_notifier->evtype = LTTNG_TYPE_EVENT; | |
21f58fb7 | 1042 | event_notifier->send_notification = lttng_event_notifier_notification_send; |
dffef45d FD |
1043 | INIT_LIST_HEAD(&event_notifier->bytecode_runtime_head); |
1044 | INIT_LIST_HEAD(&event_notifier->enablers_ref_head); | |
1045 | ||
1046 | switch (itype) { | |
1047 | case LTTNG_KERNEL_TRACEPOINT: | |
1048 | /* Event will be enabled by enabler sync. */ | |
1049 | event_notifier->enabled = 0; | |
1050 | event_notifier->registered = 0; | |
1051 | event_notifier->desc = lttng_event_desc_get(event_name); | |
1052 | if (!event_notifier->desc) { | |
1053 | ret = -ENOENT; | |
1054 | goto register_error; | |
1055 | } | |
1056 | /* Populate lttng_event_notifier structure before event registration. */ | |
1057 | smp_wmb(); | |
1058 | break; | |
1059 | case LTTNG_KERNEL_KPROBE: | |
1060 | case LTTNG_KERNEL_UPROBE: | |
1061 | case LTTNG_KERNEL_KRETPROBE: | |
1062 | case LTTNG_KERNEL_FUNCTION: | |
1063 | case LTTNG_KERNEL_NOOP: | |
1064 | case LTTNG_KERNEL_SYSCALL: | |
1065 | default: | |
1066 | WARN_ON_ONCE(1); | |
1067 | ret = -EINVAL; | |
1068 | goto register_error; | |
1069 | } | |
1070 | ||
1071 | list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head); | |
1072 | hlist_add_head(&event_notifier->hlist, head); | |
1073 | return event_notifier; | |
1074 | ||
1075 | register_error: | |
1076 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1077 | cache_error: | |
1078 | exist: | |
1079 | type_error: | |
1080 | return ERR_PTR(ret); | |
1081 | } | |
1082 | ||
3c997079 MD |
1083 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
1084 | struct lttng_kernel_event *event_param, | |
1085 | void *filter, | |
1086 | const struct lttng_event_desc *event_desc, | |
1087 | enum lttng_kernel_instrumentation itype) | |
1088 | { | |
1089 | struct lttng_event *event; | |
1090 | ||
1091 | mutex_lock(&sessions_mutex); | |
1092 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
1093 | itype); | |
1094 | mutex_unlock(&sessions_mutex); | |
1095 | return event; | |
1096 | } | |
1097 | ||
dffef45d FD |
1098 | struct lttng_event_notifier *lttng_event_notifier_create( |
1099 | const struct lttng_event_desc *event_desc, | |
1100 | uint64_t id, struct lttng_event_notifier_group *event_notifier_group, | |
1101 | struct lttng_kernel_event_notifier *event_notifier_param, | |
1102 | void *filter, enum lttng_kernel_instrumentation itype) | |
1103 | { | |
1104 | struct lttng_event_notifier *event_notifier; | |
1105 | ||
1106 | mutex_lock(&sessions_mutex); | |
1107 | event_notifier = _lttng_event_notifier_create(event_desc, id, | |
1108 | event_notifier_group, event_notifier_param, filter, itype); | |
1109 | mutex_unlock(&sessions_mutex); | |
1110 | return event_notifier; | |
1111 | } | |
1112 | ||
3c997079 MD |
1113 | /* Only used for tracepoints for now. */ |
1114 | static | |
1115 | void register_event(struct lttng_event *event) | |
1116 | { | |
1117 | const struct lttng_event_desc *desc; | |
f127e61e | 1118 | int ret = -EINVAL; |
3c997079 | 1119 | |
3c997079 MD |
1120 | if (event->registered) |
1121 | return; | |
4ecb5ad5 | 1122 | |
3c997079 | 1123 | desc = event->desc; |
4ecb5ad5 MD |
1124 | switch (event->instrumentation) { |
1125 | case LTTNG_KERNEL_TRACEPOINT: | |
1126 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
1127 | desc->probe_callback, | |
1128 | event); | |
1129 | break; | |
1130 | case LTTNG_KERNEL_SYSCALL: | |
badfe9f5 | 1131 | ret = lttng_syscall_filter_enable(event->chan, event); |
4ecb5ad5 MD |
1132 | break; |
1133 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 1134 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 1135 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
1136 | case LTTNG_KERNEL_NOOP: |
1137 | ret = 0; | |
1138 | break; | |
e884017c | 1139 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
1140 | default: |
1141 | WARN_ON_ONCE(1); | |
1142 | } | |
3c997079 MD |
1143 | if (!ret) |
1144 | event->registered = 1; | |
1145 | } | |
1146 | ||
4e3c1b9b MD |
1147 | /* |
1148 | * Only used internally at session destruction. | |
1149 | */ | |
a90917c3 | 1150 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 1151 | { |
4ecb5ad5 | 1152 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
1153 | int ret = -EINVAL; |
1154 | ||
3c997079 MD |
1155 | if (!event->registered) |
1156 | return 0; | |
1157 | ||
4ecb5ad5 | 1158 | desc = event->desc; |
38d024ae | 1159 | switch (event->instrumentation) { |
ab2277d6 | 1160 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 1161 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 1162 | event->desc->probe_callback, |
11b5a3c2 | 1163 | event); |
baf20995 | 1164 | break; |
ab2277d6 | 1165 | case LTTNG_KERNEL_KPROBE: |
8bf17deb | 1166 | lttng_kprobes_unregister_event(event); |
d6d808f3 MD |
1167 | ret = 0; |
1168 | break; | |
7371f44c MD |
1169 | case LTTNG_KERNEL_KRETPROBE: |
1170 | lttng_kretprobes_unregister(event); | |
1171 | ret = 0; | |
1172 | break; | |
33a39a3c | 1173 | case LTTNG_KERNEL_SYSCALL: |
badfe9f5 | 1174 | ret = lttng_syscall_filter_disable(event->chan, event); |
4ecb5ad5 MD |
1175 | break; |
1176 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
1177 | ret = 0; |
1178 | break; | |
149b9a9d YB |
1179 | case LTTNG_KERNEL_UPROBE: |
1180 | lttng_uprobes_unregister(event); | |
1181 | ret = 0; | |
1182 | break; | |
e884017c | 1183 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
1184 | default: |
1185 | WARN_ON_ONCE(1); | |
1186 | } | |
3c997079 MD |
1187 | if (!ret) |
1188 | event->registered = 0; | |
dda6a249 MD |
1189 | return ret; |
1190 | } | |
1191 | ||
dffef45d FD |
1192 | /* Only used for tracepoints for now. */ |
1193 | static | |
b01155ba | 1194 | void register_event_notifier(struct lttng_event_notifier *event_notifier) |
dffef45d FD |
1195 | { |
1196 | const struct lttng_event_desc *desc; | |
1197 | int ret = -EINVAL; | |
1198 | ||
1199 | if (event_notifier->registered) | |
1200 | return; | |
1201 | ||
1202 | desc = event_notifier->desc; | |
1203 | switch (event_notifier->instrumentation) { | |
1204 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1205 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, |
1206 | desc->event_notifier_callback, | |
1207 | event_notifier); | |
1208 | break; | |
dffef45d FD |
1209 | case LTTNG_KERNEL_SYSCALL: |
1210 | case LTTNG_KERNEL_KPROBE: | |
1211 | case LTTNG_KERNEL_UPROBE: | |
1212 | case LTTNG_KERNEL_KRETPROBE: | |
1213 | case LTTNG_KERNEL_FUNCTION: | |
1214 | case LTTNG_KERNEL_NOOP: | |
1215 | default: | |
1216 | WARN_ON_ONCE(1); | |
1217 | } | |
1218 | if (!ret) | |
1219 | event_notifier->registered = 1; | |
1220 | } | |
1221 | ||
1222 | static | |
1223 | int _lttng_event_notifier_unregister( | |
1224 | struct lttng_event_notifier *event_notifier) | |
1225 | { | |
1226 | const struct lttng_event_desc *desc; | |
1227 | int ret = -EINVAL; | |
1228 | ||
1229 | if (!event_notifier->registered) | |
1230 | return 0; | |
1231 | ||
1232 | desc = event_notifier->desc; | |
1233 | switch (event_notifier->instrumentation) { | |
1234 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1235 | ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname, |
1236 | event_notifier->desc->event_notifier_callback, | |
1237 | event_notifier); | |
1238 | break; | |
dffef45d FD |
1239 | case LTTNG_KERNEL_KPROBE: |
1240 | case LTTNG_KERNEL_KRETPROBE: | |
1241 | case LTTNG_KERNEL_FUNCTION: | |
1242 | case LTTNG_KERNEL_SYSCALL: | |
1243 | case LTTNG_KERNEL_NOOP: | |
1244 | case LTTNG_KERNEL_UPROBE: | |
1245 | default: | |
1246 | WARN_ON_ONCE(1); | |
1247 | } | |
1248 | if (!ret) | |
1249 | event_notifier->registered = 0; | |
1250 | return ret; | |
1251 | } | |
1252 | ||
dda6a249 MD |
1253 | /* |
1254 | * Only used internally at session destruction. | |
1255 | */ | |
be066e6c | 1256 | static |
a90917c3 | 1257 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 1258 | { |
edeb3137 MD |
1259 | switch (event->instrumentation) { |
1260 | case LTTNG_KERNEL_TRACEPOINT: | |
0bcedee9 | 1261 | lttng_event_desc_put(event->desc); |
edeb3137 MD |
1262 | break; |
1263 | case LTTNG_KERNEL_KPROBE: | |
1264 | module_put(event->desc->owner); | |
8bf17deb | 1265 | lttng_kprobes_destroy_event_private(event); |
edeb3137 | 1266 | break; |
7371f44c MD |
1267 | case LTTNG_KERNEL_KRETPROBE: |
1268 | module_put(event->desc->owner); | |
1269 | lttng_kretprobes_destroy_private(event); | |
1270 | break; | |
259b6cb3 | 1271 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 1272 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 1273 | break; |
149b9a9d YB |
1274 | case LTTNG_KERNEL_UPROBE: |
1275 | module_put(event->desc->owner); | |
1276 | lttng_uprobes_destroy_private(event); | |
1277 | break; | |
e884017c | 1278 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
1279 | default: |
1280 | WARN_ON_ONCE(1); | |
1281 | } | |
dda6a249 | 1282 | list_del(&event->list); |
8070f5c0 | 1283 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 1284 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
1285 | } |
1286 | ||
dffef45d FD |
1287 | /* |
1288 | * Only used internally at session destruction. | |
1289 | */ | |
1290 | static | |
1291 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
1292 | { | |
1293 | switch (event_notifier->instrumentation) { | |
1294 | case LTTNG_KERNEL_TRACEPOINT: | |
b01155ba FD |
1295 | lttng_event_desc_put(event_notifier->desc); |
1296 | break; | |
dffef45d FD |
1297 | case LTTNG_KERNEL_KPROBE: |
1298 | case LTTNG_KERNEL_KRETPROBE: | |
1299 | case LTTNG_KERNEL_FUNCTION: | |
1300 | case LTTNG_KERNEL_NOOP: | |
1301 | case LTTNG_KERNEL_SYSCALL: | |
1302 | case LTTNG_KERNEL_UPROBE: | |
1303 | default: | |
1304 | WARN_ON_ONCE(1); | |
1305 | } | |
1306 | list_del(&event_notifier->list); | |
1307 | kmem_cache_free(event_notifier_cache, event_notifier); | |
1308 | } | |
1309 | ||
d1f652f8 MD |
1310 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
1311 | enum tracker_type tracker_type) | |
e0130fab | 1312 | { |
d1f652f8 MD |
1313 | switch (tracker_type) { |
1314 | case TRACKER_PID: | |
1315 | return &session->pid_tracker; | |
1316 | case TRACKER_VPID: | |
1317 | return &session->vpid_tracker; | |
1318 | case TRACKER_UID: | |
1319 | return &session->uid_tracker; | |
1320 | case TRACKER_VUID: | |
1321 | return &session->vuid_tracker; | |
1322 | case TRACKER_GID: | |
1323 | return &session->gid_tracker; | |
1324 | case TRACKER_VGID: | |
1325 | return &session->vgid_tracker; | |
1326 | default: | |
1327 | WARN_ON_ONCE(1); | |
1328 | return NULL; | |
1329 | } | |
1330 | } | |
1331 | ||
1332 | int lttng_session_track_id(struct lttng_session *session, | |
1333 | enum tracker_type tracker_type, int id) | |
1334 | { | |
1335 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
1336 | int ret; |
1337 | ||
d1f652f8 MD |
1338 | tracker = get_tracker(session, tracker_type); |
1339 | if (!tracker) | |
1340 | return -EINVAL; | |
1341 | if (id < -1) | |
e0130fab MD |
1342 | return -EINVAL; |
1343 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1344 | if (id == -1) { |
1345 | /* track all ids: destroy tracker. */ | |
1346 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
1347 | ret = 0; |
1348 | } else { | |
d1f652f8 | 1349 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 1350 | } |
e0130fab MD |
1351 | mutex_unlock(&sessions_mutex); |
1352 | return ret; | |
1353 | } | |
1354 | ||
d1f652f8 MD |
1355 | int lttng_session_untrack_id(struct lttng_session *session, |
1356 | enum tracker_type tracker_type, int id) | |
e0130fab | 1357 | { |
d1f652f8 | 1358 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1359 | int ret; |
1360 | ||
d1f652f8 MD |
1361 | tracker = get_tracker(session, tracker_type); |
1362 | if (!tracker) | |
1363 | return -EINVAL; | |
1364 | if (id < -1) | |
e0130fab MD |
1365 | return -EINVAL; |
1366 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1367 | if (id == -1) { |
1368 | /* untrack all ids: replace by empty tracker. */ | |
1369 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1370 | } else { |
d1f652f8 | 1371 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1372 | } |
e0130fab MD |
1373 | mutex_unlock(&sessions_mutex); |
1374 | return ret; | |
1375 | } | |
1376 | ||
7e6f9ef6 | 1377 | static |
d1f652f8 | 1378 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1379 | { |
d1f652f8 MD |
1380 | struct lttng_id_tracker *id_tracker = m->private; |
1381 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1382 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1383 | int iter = 0, i; |
1384 | ||
1385 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1386 | if (id_tracker_p) { |
1387 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1388 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1389 | |
f934e302 | 1390 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1391 | if (iter++ >= *pos) |
1392 | return e; | |
1393 | } | |
1394 | } | |
1395 | } else { | |
d1f652f8 | 1396 | /* ID tracker disabled. */ |
7e6f9ef6 | 1397 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1398 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1399 | } |
1400 | iter++; | |
1401 | } | |
1402 | /* End of list */ | |
1403 | return NULL; | |
1404 | } | |
1405 | ||
1406 | /* Called with sessions_mutex held. */ | |
1407 | static | |
d1f652f8 | 1408 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1409 | { |
d1f652f8 MD |
1410 | struct lttng_id_tracker *id_tracker = m->private; |
1411 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1412 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1413 | int iter = 0, i; |
1414 | ||
1415 | (*ppos)++; | |
d1f652f8 MD |
1416 | if (id_tracker_p) { |
1417 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1418 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1419 | |
f934e302 | 1420 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1421 | if (iter++ >= *ppos) |
1422 | return e; | |
1423 | } | |
1424 | } | |
1425 | } else { | |
d1f652f8 | 1426 | /* ID tracker disabled. */ |
7e6f9ef6 | 1427 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1428 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1429 | iter++; |
1430 | } | |
1431 | ||
1432 | /* End of list */ | |
1433 | return NULL; | |
1434 | } | |
1435 | ||
1436 | static | |
d1f652f8 | 1437 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1438 | { |
1439 | mutex_unlock(&sessions_mutex); | |
1440 | } | |
1441 | ||
1442 | static | |
d1f652f8 | 1443 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1444 | { |
d1f652f8 MD |
1445 | struct lttng_id_tracker *id_tracker = m->private; |
1446 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1447 | int id; | |
7e6f9ef6 | 1448 | |
d1f652f8 | 1449 | if (p == id_tracker_p) { |
7e6f9ef6 | 1450 | /* Tracker disabled. */ |
d1f652f8 | 1451 | id = -1; |
7e6f9ef6 | 1452 | } else { |
d1f652f8 | 1453 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1454 | |
d1f652f8 MD |
1455 | id = lttng_id_tracker_get_node_id(e); |
1456 | } | |
1457 | switch (id_tracker->tracker_type) { | |
1458 | case TRACKER_PID: | |
1459 | seq_printf(m, "process { pid = %d; };\n", id); | |
1460 | break; | |
1461 | case TRACKER_VPID: | |
1462 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1463 | break; | |
1464 | case TRACKER_UID: | |
1465 | seq_printf(m, "user { uid = %d; };\n", id); | |
1466 | break; | |
1467 | case TRACKER_VUID: | |
1468 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1469 | break; | |
1470 | case TRACKER_GID: | |
1471 | seq_printf(m, "group { gid = %d; };\n", id); | |
1472 | break; | |
1473 | case TRACKER_VGID: | |
1474 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1475 | break; | |
1476 | default: | |
1477 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1478 | } |
7e6f9ef6 MD |
1479 | return 0; |
1480 | } | |
1481 | ||
1482 | static | |
d1f652f8 MD |
1483 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1484 | .start = id_list_start, | |
1485 | .next = id_list_next, | |
1486 | .stop = id_list_stop, | |
1487 | .show = id_list_show, | |
7e6f9ef6 MD |
1488 | }; |
1489 | ||
1490 | static | |
d1f652f8 | 1491 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1492 | { |
d1f652f8 | 1493 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1494 | } |
1495 | ||
1496 | static | |
d1f652f8 | 1497 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1498 | { |
1499 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1500 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1501 | int ret; |
1502 | ||
d1f652f8 | 1503 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1504 | ret = seq_release(inode, file); |
d1f652f8 MD |
1505 | if (!ret) |
1506 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1507 | return ret; |
1508 | } | |
1509 | ||
d1f652f8 | 1510 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1511 | .owner = THIS_MODULE, |
d1f652f8 | 1512 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1513 | .read = seq_read, |
1514 | .llseek = seq_lseek, | |
d1f652f8 | 1515 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1516 | }; |
1517 | ||
d1f652f8 MD |
1518 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1519 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1520 | { |
d1f652f8 | 1521 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1522 | struct seq_file *m; |
1523 | int file_fd, ret; | |
1524 | ||
1525 | file_fd = lttng_get_unused_fd(); | |
1526 | if (file_fd < 0) { | |
1527 | ret = file_fd; | |
1528 | goto fd_error; | |
1529 | } | |
1530 | ||
d1f652f8 MD |
1531 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1532 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1533 | NULL, O_RDWR); |
d1f652f8 MD |
1534 | if (IS_ERR(tracker_ids_list_file)) { |
1535 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1536 | goto file_error; |
1537 | } | |
98d7281c MJ |
1538 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1539 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1540 | goto refcount_error; |
1541 | } | |
d1f652f8 | 1542 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1543 | if (ret < 0) |
1544 | goto open_error; | |
d1f652f8 MD |
1545 | m = tracker_ids_list_file->private_data; |
1546 | ||
1547 | m->private = get_tracker(session, tracker_type); | |
1548 | BUG_ON(!m->private); | |
1549 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1550 | |
1551 | return file_fd; | |
1552 | ||
1553 | open_error: | |
9c1f4643 MD |
1554 | atomic_long_dec(&session->file->f_count); |
1555 | refcount_error: | |
d1f652f8 | 1556 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1557 | file_error: |
1558 | put_unused_fd(file_fd); | |
1559 | fd_error: | |
1560 | return ret; | |
1561 | } | |
1562 | ||
3c997079 MD |
1563 | /* |
1564 | * Enabler management. | |
1565 | */ | |
1566 | static | |
4993071a PP |
1567 | int lttng_match_enabler_star_glob(const char *desc_name, |
1568 | const char *pattern) | |
3c997079 | 1569 | { |
cbc19040 MD |
1570 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1571 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1572 | return 0; |
1573 | return 1; | |
1574 | } | |
1575 | ||
1576 | static | |
4ecb5ad5 MD |
1577 | int lttng_match_enabler_name(const char *desc_name, |
1578 | const char *name) | |
3c997079 | 1579 | { |
4ecb5ad5 | 1580 | if (strcmp(desc_name, name)) |
3c997079 MD |
1581 | return 0; |
1582 | return 1; | |
1583 | } | |
1584 | ||
1585 | static | |
1586 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1587 | struct lttng_enabler *enabler) | |
1588 | { | |
4ecb5ad5 | 1589 | const char *desc_name, *enabler_name; |
badfe9f5 | 1590 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1591 | |
1592 | enabler_name = enabler->event_param.name; | |
1593 | switch (enabler->event_param.instrumentation) { | |
1594 | case LTTNG_KERNEL_TRACEPOINT: | |
1595 | desc_name = desc->name; | |
3b861b22 FD |
1596 | switch (enabler->format_type) { |
1597 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1598 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1599 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1600 | return lttng_match_enabler_name(desc_name, enabler_name); |
1601 | default: | |
1602 | return -EINVAL; | |
1603 | } | |
4ecb5ad5 MD |
1604 | break; |
1605 | case LTTNG_KERNEL_SYSCALL: | |
1606 | desc_name = desc->name; | |
badfe9f5 | 1607 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1608 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1609 | compat = true; |
1610 | } | |
4ecb5ad5 MD |
1611 | if (!strncmp(desc_name, "syscall_exit_", |
1612 | strlen("syscall_exit_"))) { | |
1613 | desc_name += strlen("syscall_exit_"); | |
1614 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1615 | strlen("syscall_entry_"))) { | |
1616 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1617 | entry = true; |
4ecb5ad5 MD |
1618 | } else { |
1619 | WARN_ON_ONCE(1); | |
1620 | return -EINVAL; | |
1621 | } | |
badfe9f5 MD |
1622 | switch (enabler->event_param.u.syscall.entryexit) { |
1623 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1624 | break; | |
1625 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1626 | if (!entry) | |
1627 | return 0; | |
1628 | break; | |
1629 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1630 | if (entry) | |
1631 | return 0; | |
1632 | break; | |
1633 | default: | |
1634 | return -EINVAL; | |
1635 | } | |
1636 | switch (enabler->event_param.u.syscall.abi) { | |
1637 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1638 | break; | |
1639 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1640 | if (compat) | |
1641 | return 0; | |
1642 | break; | |
1643 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1644 | if (!compat) | |
1645 | return 0; | |
1646 | break; | |
1647 | default: | |
1648 | return -EINVAL; | |
1649 | } | |
1650 | switch (enabler->event_param.u.syscall.match) { | |
1651 | case LTTNG_SYSCALL_MATCH_NAME: | |
3b861b22 FD |
1652 | switch (enabler->format_type) { |
1653 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1654 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1655 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1656 | return lttng_match_enabler_name(desc_name, enabler_name); |
1657 | default: | |
1658 | return -EINVAL; | |
1659 | } | |
1660 | break; | |
1661 | case LTTNG_SYSCALL_MATCH_NR: | |
1662 | return -EINVAL; /* Not implemented. */ | |
1663 | default: | |
1664 | return -EINVAL; | |
1665 | } | |
4ecb5ad5 MD |
1666 | break; |
1667 | default: | |
1668 | WARN_ON_ONCE(1); | |
1669 | return -EINVAL; | |
1670 | } | |
3c997079 MD |
1671 | } |
1672 | ||
1673 | static | |
b2bc0bc8 FD |
1674 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1675 | struct lttng_event *event) | |
3c997079 | 1676 | { |
b2bc0bc8 FD |
1677 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1678 | event_enabler); | |
1679 | ||
1680 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1681 | return 0; |
b2bc0bc8 FD |
1682 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1683 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1684 | return 1; |
1685 | else | |
1686 | return 0; | |
1687 | } | |
1688 | ||
b01155ba FD |
1689 | static |
1690 | int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1691 | struct lttng_event_notifier *event_notifier) | |
1692 | { | |
1693 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
1694 | event_notifier_enabler); | |
1695 | ||
1696 | if (base_enabler->event_param.instrumentation != event_notifier->instrumentation) | |
1697 | return 0; | |
1698 | if (lttng_desc_match_enabler(event_notifier->desc, base_enabler) | |
1699 | && event_notifier->group == event_notifier_enabler->group | |
1700 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1701 | return 1; | |
1702 | else | |
1703 | return 0; | |
1704 | } | |
1705 | ||
3c997079 | 1706 | static |
b2bc0bc8 FD |
1707 | struct lttng_enabler_ref *lttng_enabler_ref( |
1708 | struct list_head *enablers_ref_list, | |
3c997079 MD |
1709 | struct lttng_enabler *enabler) |
1710 | { | |
1711 | struct lttng_enabler_ref *enabler_ref; | |
1712 | ||
b2bc0bc8 | 1713 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
1714 | if (enabler_ref->ref == enabler) |
1715 | return enabler_ref; | |
1716 | } | |
1717 | return NULL; | |
1718 | } | |
1719 | ||
3c997079 | 1720 | static |
1b917d6b | 1721 | void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 1722 | { |
b2bc0bc8 | 1723 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
1724 | struct lttng_probe_desc *probe_desc; |
1725 | const struct lttng_event_desc *desc; | |
1726 | int i; | |
1727 | struct list_head *probe_list; | |
1728 | ||
1729 | probe_list = lttng_get_probe_list_head(); | |
1730 | /* | |
1731 | * For each probe event, if we find that a probe event matches | |
1732 | * our enabler, create an associated lttng_event if not | |
1733 | * already present. | |
1734 | */ | |
1735 | list_for_each_entry(probe_desc, probe_list, head) { | |
1736 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1737 | int found = 0; | |
1738 | struct hlist_head *head; | |
3c997079 MD |
1739 | struct lttng_event *event; |
1740 | ||
1741 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
1742 | if (!lttng_desc_match_enabler(desc, |
1743 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 | 1744 | continue; |
3c997079 MD |
1745 | |
1746 | /* | |
1747 | * Check if already created. | |
1748 | */ | |
4a11ef1c FD |
1749 | head = utils_borrow_hash_table_bucket( |
1750 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
1751 | desc->name); | |
d216ecae | 1752 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 1753 | if (event->desc == desc |
b2bc0bc8 | 1754 | && event->chan == event_enabler->chan) |
3c997079 MD |
1755 | found = 1; |
1756 | } | |
1757 | if (found) | |
1758 | continue; | |
1759 | ||
1760 | /* | |
1761 | * We need to create an event for this | |
1762 | * event probe. | |
1763 | */ | |
b2bc0bc8 | 1764 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
1765 | NULL, NULL, desc, |
1766 | LTTNG_KERNEL_TRACEPOINT); | |
1767 | if (!event) { | |
5a15f70c | 1768 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
1769 | probe_desc->event_desc[i]->name); |
1770 | } | |
1771 | } | |
1772 | } | |
1773 | } | |
1774 | ||
b01155ba FD |
1775 | static |
1776 | void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1777 | { | |
1778 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1779 | struct lttng_probe_desc *probe_desc; | |
1780 | const struct lttng_event_desc *desc; | |
1781 | int i; | |
1782 | struct list_head *probe_list; | |
1783 | ||
1784 | probe_list = lttng_get_probe_list_head(); | |
1785 | /* | |
1786 | * For each probe event, if we find that a probe event matches | |
1787 | * our enabler, create an associated lttng_event_notifier if not | |
1788 | * already present. | |
1789 | */ | |
1790 | list_for_each_entry(probe_desc, probe_list, head) { | |
1791 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1792 | int found = 0; | |
1793 | struct hlist_head *head; | |
1794 | struct lttng_event_notifier *event_notifier; | |
1795 | ||
1796 | desc = probe_desc->event_desc[i]; | |
1797 | if (!lttng_desc_match_enabler(desc, | |
1798 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1799 | continue; | |
1800 | ||
1801 | /* | |
1802 | * Check if already created. | |
1803 | */ | |
1804 | head = utils_borrow_hash_table_bucket( | |
1805 | event_notifier_group->event_notifiers_ht.table, | |
1806 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
1807 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1808 | if (event_notifier->desc == desc | |
1809 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1810 | found = 1; | |
1811 | } | |
1812 | if (found) | |
1813 | continue; | |
1814 | ||
1815 | /* | |
1816 | * We need to create a event_notifier for this event probe. | |
1817 | */ | |
1818 | event_notifier = _lttng_event_notifier_create(desc, | |
1819 | event_notifier_enabler->base.user_token, | |
1820 | event_notifier_group, NULL, NULL, | |
1821 | LTTNG_KERNEL_TRACEPOINT); | |
1822 | if (IS_ERR(event_notifier)) { | |
1823 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
1824 | probe_desc->event_desc[i]->name); | |
1825 | } | |
1826 | } | |
1827 | } | |
1828 | } | |
1829 | ||
33a39a3c | 1830 | static |
1b917d6b | 1831 | void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
1832 | { |
1833 | int ret; | |
1834 | ||
b2bc0bc8 | 1835 | ret = lttng_syscalls_register(event_enabler->chan, NULL); |
33a39a3c MD |
1836 | WARN_ON_ONCE(ret); |
1837 | } | |
1838 | ||
1839 | /* | |
1840 | * Create struct lttng_event if it is missing and present in the list of | |
1841 | * tracepoint probes. | |
1842 | * Should be called with sessions mutex held. | |
1843 | */ | |
1844 | static | |
b2bc0bc8 | 1845 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 1846 | { |
b2bc0bc8 | 1847 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 1848 | case LTTNG_KERNEL_TRACEPOINT: |
1b917d6b | 1849 | lttng_create_tracepoint_event_if_missing(event_enabler); |
33a39a3c MD |
1850 | break; |
1851 | case LTTNG_KERNEL_SYSCALL: | |
1b917d6b | 1852 | lttng_create_syscall_event_if_missing(event_enabler); |
33a39a3c MD |
1853 | break; |
1854 | default: | |
1855 | WARN_ON_ONCE(1); | |
1856 | break; | |
1857 | } | |
1858 | } | |
1859 | ||
3c997079 | 1860 | /* |
b2bc0bc8 | 1861 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
1862 | * and add backward reference from the event to the enabler. |
1863 | * Should be called with sessions mutex held. | |
1864 | */ | |
1865 | static | |
b2bc0bc8 | 1866 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 1867 | { |
b2bc0bc8 FD |
1868 | struct lttng_channel *chan = event_enabler->chan; |
1869 | struct lttng_session *session = event_enabler->chan->session; | |
1870 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
1871 | struct lttng_event *event; |
1872 | ||
b2bc0bc8 FD |
1873 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
1874 | base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && | |
1875 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
1876 | base_enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME && | |
1877 | !strcmp(base_enabler->event_param.name, "*")) { | |
1878 | if (base_enabler->enabled) | |
badfe9f5 MD |
1879 | WRITE_ONCE(chan->syscall_all, 1); |
1880 | else | |
1881 | WRITE_ONCE(chan->syscall_all, 0); | |
1882 | } | |
1883 | ||
3c997079 | 1884 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 1885 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 1886 | |
b2bc0bc8 | 1887 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
1888 | list_for_each_entry(event, &session->events, list) { |
1889 | struct lttng_enabler_ref *enabler_ref; | |
1890 | ||
b2bc0bc8 | 1891 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 1892 | continue; |
b2bc0bc8 FD |
1893 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1894 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
1895 | if (!enabler_ref) { |
1896 | /* | |
1897 | * If no backward ref, create it. | |
b2bc0bc8 | 1898 | * Add backward ref from event to event_enabler. |
3c997079 MD |
1899 | */ |
1900 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1901 | if (!enabler_ref) | |
1902 | return -ENOMEM; | |
b2bc0bc8 | 1903 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
1904 | list_add(&enabler_ref->node, |
1905 | &event->enablers_ref_head); | |
1906 | } | |
1907 | ||
f127e61e MD |
1908 | /* |
1909 | * Link filter bytecodes if not linked yet. | |
1910 | */ | |
2dfda770 FD |
1911 | lttng_enabler_link_bytecode(event->desc, |
1912 | lttng_static_ctx, | |
1913 | &event->bytecode_runtime_head, | |
1914 | lttng_event_enabler_as_enabler(event_enabler)); | |
f127e61e | 1915 | |
3c997079 MD |
1916 | /* TODO: merge event context. */ |
1917 | } | |
1918 | return 0; | |
1919 | } | |
1920 | ||
b01155ba FD |
1921 | /* |
1922 | * Create struct lttng_event_notifier if it is missing and present in the list of | |
1923 | * tracepoint probes. | |
1924 | * Should be called with sessions mutex held. | |
1925 | */ | |
1926 | static | |
1927 | void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1928 | { | |
1929 | switch (event_notifier_enabler->base.event_param.instrumentation) { | |
1930 | case LTTNG_KERNEL_TRACEPOINT: | |
1931 | lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler); | |
1932 | break; | |
1933 | default: | |
1934 | WARN_ON_ONCE(1); | |
1935 | break; | |
1936 | } | |
1937 | } | |
1938 | ||
1939 | /* | |
1940 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
1941 | */ | |
1942 | static | |
1943 | int lttng_event_notifier_enabler_ref_event_notifiers(struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1944 | { | |
1945 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1946 | struct lttng_event_notifier *event_notifier; | |
1947 | ||
1948 | /* First ensure that probe event_notifiers are created for this enabler. */ | |
1949 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
1950 | ||
1951 | /* Link the created event_notifier with its associated enabler. */ | |
1952 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
1953 | struct lttng_enabler_ref *enabler_ref; | |
1954 | ||
1955 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
1956 | continue; | |
1957 | ||
1958 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
1959 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1960 | if (!enabler_ref) { | |
1961 | /* | |
1962 | * If no backward ref, create it. | |
1963 | * Add backward ref from event_notifier to enabler. | |
1964 | */ | |
1965 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1966 | if (!enabler_ref) | |
1967 | return -ENOMEM; | |
1968 | ||
1969 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
1970 | event_notifier_enabler); | |
1971 | list_add(&enabler_ref->node, | |
1972 | &event_notifier->enablers_ref_head); | |
1973 | } | |
1974 | ||
1975 | /* | |
1976 | * Link filter bytecodes if not linked yet. | |
1977 | */ | |
1978 | lttng_enabler_link_bytecode(event_notifier->desc, | |
1979 | lttng_static_ctx, &event_notifier->bytecode_runtime_head, | |
1980 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1981 | } | |
1982 | return 0; | |
1983 | } | |
1984 | ||
3c997079 MD |
1985 | /* |
1986 | * Called at module load: connect the probe on all enablers matching | |
1987 | * this event. | |
1988 | * Called with sessions lock held. | |
1989 | */ | |
1990 | int lttng_fix_pending_events(void) | |
1991 | { | |
1992 | struct lttng_session *session; | |
1993 | ||
1994 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 1995 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
1996 | return 0; |
1997 | } | |
1998 | ||
b01155ba FD |
1999 | static bool lttng_event_notifier_group_has_active_event_notifiers( |
2000 | struct lttng_event_notifier_group *event_notifier_group) | |
2001 | { | |
2002 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2003 | ||
2004 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, | |
2005 | node) { | |
2006 | if (event_notifier_enabler->base.enabled) | |
2007 | return true; | |
2008 | } | |
2009 | return false; | |
2010 | } | |
2011 | ||
2012 | bool lttng_event_notifier_active(void) | |
2013 | { | |
2014 | struct lttng_event_notifier_group *event_notifier_group; | |
2015 | ||
2016 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2017 | if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group)) | |
2018 | return true; | |
2019 | } | |
2020 | return false; | |
2021 | } | |
2022 | ||
2023 | int lttng_fix_pending_event_notifiers(void) | |
2024 | { | |
2025 | struct lttng_event_notifier_group *event_notifier_group; | |
2026 | ||
2027 | list_for_each_entry(event_notifier_group, &event_notifier_groups, node) | |
2028 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
2029 | return 0; | |
2030 | } | |
2031 | ||
b2bc0bc8 FD |
2032 | struct lttng_event_enabler *lttng_event_enabler_create( |
2033 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
2034 | struct lttng_kernel_event *event_param, |
2035 | struct lttng_channel *chan) | |
2036 | { | |
b2bc0bc8 | 2037 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2038 | |
b2bc0bc8 FD |
2039 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
2040 | if (!event_enabler) | |
3c997079 | 2041 | return NULL; |
b2bc0bc8 FD |
2042 | event_enabler->base.format_type = format_type; |
2043 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
2044 | memcpy(&event_enabler->base.event_param, event_param, | |
2045 | sizeof(event_enabler->base.event_param)); | |
2046 | event_enabler->chan = chan; | |
3c997079 | 2047 | /* ctx left NULL */ |
b2bc0bc8 FD |
2048 | event_enabler->base.enabled = 0; |
2049 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 2050 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
2051 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
2052 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 2053 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 2054 | return event_enabler; |
3c997079 MD |
2055 | } |
2056 | ||
b2bc0bc8 | 2057 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2058 | { |
2059 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2060 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
2061 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2062 | mutex_unlock(&sessions_mutex); |
2063 | return 0; | |
2064 | } | |
2065 | ||
b2bc0bc8 | 2066 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
2067 | { |
2068 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
2069 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
2070 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
2071 | mutex_unlock(&sessions_mutex); |
2072 | return 0; | |
2073 | } | |
2074 | ||
b2bc0bc8 | 2075 | static |
07dfc1d0 MD |
2076 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
2077 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2078 | { | |
2079 | struct lttng_filter_bytecode_node *bytecode_node; | |
2080 | uint32_t bytecode_len; | |
2081 | int ret; | |
2082 | ||
2083 | ret = get_user(bytecode_len, &bytecode->len); | |
2084 | if (ret) | |
2085 | return ret; | |
2086 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
2087 | GFP_KERNEL); | |
2088 | if (!bytecode_node) | |
2089 | return -ENOMEM; | |
2090 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
2091 | sizeof(*bytecode) + bytecode_len); | |
2092 | if (ret) | |
2093 | goto error_free; | |
b2bc0bc8 | 2094 | |
07dfc1d0 MD |
2095 | bytecode_node->enabler = enabler; |
2096 | /* Enforce length based on allocated size */ | |
2097 | bytecode_node->bc.len = bytecode_len; | |
2098 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 2099 | |
07dfc1d0 MD |
2100 | return 0; |
2101 | ||
2102 | error_free: | |
2103 | kfree(bytecode_node); | |
2104 | return ret; | |
2105 | } | |
2106 | ||
b2bc0bc8 FD |
2107 | int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler *event_enabler, |
2108 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2109 | { | |
2110 | int ret; | |
2111 | ret = lttng_enabler_attach_bytecode( | |
2112 | lttng_event_enabler_as_enabler(event_enabler), bytecode); | |
2113 | if (ret) | |
2114 | goto error; | |
2115 | ||
2116 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
2117 | return 0; | |
2118 | ||
2119 | error: | |
2120 | return ret; | |
2121 | } | |
2122 | ||
3aed4dca FD |
2123 | int lttng_event_add_callsite(struct lttng_event *event, |
2124 | struct lttng_kernel_event_callsite __user *callsite) | |
2125 | { | |
2126 | ||
2127 | switch (event->instrumentation) { | |
2128 | case LTTNG_KERNEL_UPROBE: | |
2129 | return lttng_uprobes_add_callsite(event, callsite); | |
2130 | default: | |
2131 | return -EINVAL; | |
2132 | } | |
2133 | } | |
2134 | ||
b2bc0bc8 | 2135 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
2136 | struct lttng_kernel_context *context_param) |
2137 | { | |
2138 | return -ENOSYS; | |
2139 | } | |
2140 | ||
2141 | static | |
2142 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
2143 | { | |
07dfc1d0 MD |
2144 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
2145 | ||
2146 | /* Destroy filter bytecode */ | |
2147 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
2148 | &enabler->filter_bytecode_head, node) { | |
2149 | kfree(filter_node); | |
2150 | } | |
b2bc0bc8 FD |
2151 | } |
2152 | ||
2153 | static | |
2154 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
2155 | { | |
2156 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 2157 | |
3c997079 | 2158 | /* Destroy contexts */ |
b2bc0bc8 | 2159 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 2160 | |
b2bc0bc8 FD |
2161 | list_del(&event_enabler->node); |
2162 | kfree(event_enabler); | |
3c997079 MD |
2163 | } |
2164 | ||
dffef45d FD |
2165 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
2166 | struct lttng_event_notifier_group *event_notifier_group, | |
2167 | enum lttng_enabler_format_type format_type, | |
2168 | struct lttng_kernel_event_notifier *event_notifier_param) | |
2169 | { | |
2170 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2171 | ||
2172 | event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL); | |
2173 | if (!event_notifier_enabler) | |
2174 | return NULL; | |
2175 | ||
2176 | event_notifier_enabler->base.format_type = format_type; | |
2177 | INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
2178 | ||
2179 | memcpy(&event_notifier_enabler->base.event_param.name, event_notifier_param->event.name, | |
2180 | sizeof(event_notifier_enabler->base.event_param.name)); | |
2181 | event_notifier_enabler->base.event_param.instrumentation = event_notifier_param->event.instrumentation; | |
2182 | event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
2183 | ||
2184 | event_notifier_enabler->base.enabled = 0; | |
2185 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; | |
2186 | event_notifier_enabler->group = event_notifier_group; | |
2187 | ||
2188 | mutex_lock(&sessions_mutex); | |
2189 | list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head); | |
b01155ba | 2190 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2191 | |
2192 | mutex_unlock(&sessions_mutex); | |
2193 | ||
2194 | return event_notifier_enabler; | |
2195 | } | |
2196 | ||
2197 | int lttng_event_notifier_enabler_enable( | |
2198 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2199 | { | |
2200 | mutex_lock(&sessions_mutex); | |
2201 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
b01155ba | 2202 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2203 | mutex_unlock(&sessions_mutex); |
2204 | return 0; | |
2205 | } | |
2206 | ||
2207 | int lttng_event_notifier_enabler_disable( | |
2208 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2209 | { | |
2210 | mutex_lock(&sessions_mutex); | |
2211 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
b01155ba | 2212 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2213 | mutex_unlock(&sessions_mutex); |
2214 | return 0; | |
2215 | } | |
2216 | ||
2217 | int lttng_event_notifier_enabler_attach_bytecode( | |
2218 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2219 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
2220 | { | |
2221 | int ret; | |
2222 | ||
2223 | ret = lttng_enabler_attach_bytecode( | |
2224 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
2225 | bytecode); | |
2226 | if (ret) | |
2227 | goto error; | |
2228 | ||
b01155ba | 2229 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); |
dffef45d FD |
2230 | return 0; |
2231 | ||
2232 | error: | |
2233 | return ret; | |
2234 | } | |
2235 | ||
2236 | int lttng_event_notifier_enabler_attach_context( | |
2237 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
2238 | struct lttng_kernel_context *context_param) | |
2239 | { | |
2240 | return -ENOSYS; | |
2241 | } | |
2242 | ||
2243 | static | |
2244 | void lttng_event_notifier_enabler_destroy( | |
2245 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2246 | { | |
2247 | if (!event_notifier_enabler) { | |
2248 | return; | |
2249 | } | |
2250 | ||
2251 | list_del(&event_notifier_enabler->node); | |
2252 | ||
2253 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2254 | kfree(event_notifier_enabler); | |
2255 | } | |
2256 | ||
3c997079 | 2257 | /* |
b2bc0bc8 | 2258 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
2259 | * session. |
2260 | * Should be called with sessions mutex held. | |
2261 | */ | |
2262 | static | |
b2bc0bc8 | 2263 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 2264 | { |
b2bc0bc8 | 2265 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2266 | struct lttng_event *event; |
2267 | ||
b2bc0bc8 FD |
2268 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
2269 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
2270 | /* |
2271 | * For each event, if at least one of its enablers is enabled, | |
2272 | * and its channel and session transient states are enabled, we | |
2273 | * enable the event, else we disable it. | |
2274 | */ | |
2275 | list_for_each_entry(event, &session->events, list) { | |
2276 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
2277 | struct lttng_bytecode_runtime *runtime; |
2278 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 2279 | |
4ecb5ad5 MD |
2280 | switch (event->instrumentation) { |
2281 | case LTTNG_KERNEL_TRACEPOINT: | |
2282 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
2283 | /* Enable events */ |
2284 | list_for_each_entry(enabler_ref, | |
2285 | &event->enablers_ref_head, node) { | |
2286 | if (enabler_ref->ref->enabled) { | |
2287 | enabled = 1; | |
2288 | break; | |
2289 | } | |
2290 | } | |
4ecb5ad5 MD |
2291 | break; |
2292 | default: | |
3c997079 MD |
2293 | /* Not handled with lazy sync. */ |
2294 | continue; | |
2295 | } | |
2296 | /* | |
2297 | * Enabled state is based on union of enablers, with | |
2298 | * intesection of session and channel transient enable | |
2299 | * states. | |
2300 | */ | |
2301 | enabled = enabled && session->tstate && event->chan->tstate; | |
2302 | ||
a8f2d0c7 | 2303 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
2304 | /* |
2305 | * Sync tracepoint registration with event enabled | |
2306 | * state. | |
2307 | */ | |
2308 | if (enabled) { | |
2309 | register_event(event); | |
2310 | } else { | |
2311 | _lttng_event_unregister(event); | |
2312 | } | |
07dfc1d0 MD |
2313 | |
2314 | /* Check if has enablers without bytecode enabled */ | |
2315 | list_for_each_entry(enabler_ref, | |
2316 | &event->enablers_ref_head, node) { | |
2317 | if (enabler_ref->ref->enabled | |
2318 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2319 | has_enablers_without_bytecode = 1; | |
2320 | break; | |
2321 | } | |
2322 | } | |
2323 | event->has_enablers_without_bytecode = | |
2324 | has_enablers_without_bytecode; | |
2325 | ||
2326 | /* Enable filters */ | |
2327 | list_for_each_entry(runtime, | |
f127e61e | 2328 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 2329 | lttng_filter_sync_state(runtime); |
3c997079 MD |
2330 | } |
2331 | } | |
2332 | ||
2333 | /* | |
2334 | * Apply enablers to session events, adding events to session if need | |
2335 | * be. It is required after each modification applied to an active | |
2336 | * session, and right before session "start". | |
2337 | * "lazy" sync means we only sync if required. | |
2338 | * Should be called with sessions mutex held. | |
2339 | */ | |
2340 | static | |
b2bc0bc8 | 2341 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
2342 | { |
2343 | /* We can skip if session is not active */ | |
2344 | if (!session->active) | |
2345 | return; | |
b2bc0bc8 | 2346 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
2347 | } |
2348 | ||
b01155ba FD |
2349 | static |
2350 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2351 | { | |
2352 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2353 | struct lttng_event_notifier *event_notifier; | |
2354 | ||
2355 | list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2356 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2357 | ||
2358 | /* | |
2359 | * For each event_notifier, if at least one of its enablers is enabled, | |
2360 | * we enable the event_notifier, else we disable it. | |
2361 | */ | |
2362 | list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) { | |
2363 | struct lttng_enabler_ref *enabler_ref; | |
2364 | struct lttng_bytecode_runtime *runtime; | |
2365 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2366 | ||
2367 | switch (event_notifier->instrumentation) { | |
2368 | case LTTNG_KERNEL_TRACEPOINT: | |
2369 | case LTTNG_KERNEL_SYSCALL: | |
2370 | /* Enable event_notifiers */ | |
2371 | list_for_each_entry(enabler_ref, | |
2372 | &event_notifier->enablers_ref_head, node) { | |
2373 | if (enabler_ref->ref->enabled) { | |
2374 | enabled = 1; | |
2375 | break; | |
2376 | } | |
2377 | } | |
2378 | break; | |
2379 | default: | |
2380 | /* Not handled with sync. */ | |
2381 | continue; | |
2382 | } | |
2383 | ||
2384 | WRITE_ONCE(event_notifier->enabled, enabled); | |
2385 | /* | |
2386 | * Sync tracepoint registration with event_notifier enabled | |
2387 | * state. | |
2388 | */ | |
2389 | if (enabled) { | |
2390 | if (!event_notifier->registered) | |
2391 | register_event_notifier(event_notifier); | |
2392 | } else { | |
2393 | if (event_notifier->registered) | |
2394 | _lttng_event_notifier_unregister(event_notifier); | |
2395 | } | |
2396 | ||
2397 | /* Check if has enablers without bytecode enabled */ | |
2398 | list_for_each_entry(enabler_ref, | |
2399 | &event_notifier->enablers_ref_head, node) { | |
2400 | if (enabler_ref->ref->enabled | |
2401 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2402 | has_enablers_without_bytecode = 1; | |
2403 | break; | |
2404 | } | |
2405 | } | |
2406 | event_notifier->has_enablers_without_bytecode = | |
2407 | has_enablers_without_bytecode; | |
2408 | ||
2409 | /* Enable filters */ | |
2410 | list_for_each_entry(runtime, | |
2411 | &event_notifier->bytecode_runtime_head, node) | |
2412 | lttng_filter_sync_state(runtime); | |
2413 | } | |
2414 | } | |
2415 | ||
1ec3f75a | 2416 | /* |
d83004aa JD |
2417 | * Serialize at most one packet worth of metadata into a metadata |
2418 | * channel. | |
92d9f5e6 MD |
2419 | * We grab the metadata cache mutex to get exclusive access to our metadata |
2420 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
2421 | * allows us to do racy operations such as looking for remaining space left in | |
2422 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
2423 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
2424 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
2425 | * Returns the number of bytes written in the channel, 0 if no data |
2426 | * was written and a negative value on error. | |
1ec3f75a | 2427 | */ |
b3b8072b | 2428 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 2429 | struct channel *chan, bool *coherent) |
d83004aa JD |
2430 | { |
2431 | struct lib_ring_buffer_ctx ctx; | |
2432 | int ret = 0; | |
2433 | size_t len, reserve_len; | |
2434 | ||
f613e3e6 | 2435 | /* |
92d9f5e6 MD |
2436 | * Ensure we support mutiple get_next / put sequences followed by |
2437 | * put_next. The metadata cache lock protects reading the metadata | |
2438 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
2439 | * "flush" operations on the buffer invoked by different processes. | |
2440 | * Moreover, since the metadata cache memory can be reallocated, we | |
2441 | * need to have exclusive access against updates even though we only | |
2442 | * read it. | |
f613e3e6 | 2443 | */ |
92d9f5e6 | 2444 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
2445 | WARN_ON(stream->metadata_in < stream->metadata_out); |
2446 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 2447 | goto end; |
f613e3e6 | 2448 | |
9616f0bf JD |
2449 | /* Metadata regenerated, change the version. */ |
2450 | if (stream->metadata_cache->version != stream->version) | |
2451 | stream->version = stream->metadata_cache->version; | |
2452 | ||
d83004aa | 2453 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 2454 | stream->metadata_in; |
9de2c215 | 2455 | if (!len) |
de23d59d | 2456 | goto end; |
d83004aa | 2457 | reserve_len = min_t(size_t, |
b3b8072b | 2458 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 2459 | len); |
b3b8072b | 2460 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
2461 | sizeof(char), -1); |
2462 | /* | |
2463 | * If reservation failed, return an error to the caller. | |
2464 | */ | |
b3b8072b | 2465 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
2466 | if (ret != 0) { |
2467 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 2468 | stream->coherent = false; |
d83004aa JD |
2469 | goto end; |
2470 | } | |
b3b8072b | 2471 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 2472 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 2473 | reserve_len); |
b3b8072b | 2474 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 2475 | stream->metadata_in += reserve_len; |
3e75e2a7 | 2476 | if (reserve_len < len) |
8b97fd42 MD |
2477 | stream->coherent = false; |
2478 | else | |
2479 | stream->coherent = true; | |
d83004aa JD |
2480 | ret = reserve_len; |
2481 | ||
2482 | end: | |
8b97fd42 MD |
2483 | if (coherent) |
2484 | *coherent = stream->coherent; | |
92d9f5e6 | 2485 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
2486 | return ret; |
2487 | } | |
2488 | ||
8b97fd42 MD |
2489 | static |
2490 | void lttng_metadata_begin(struct lttng_session *session) | |
2491 | { | |
3e75e2a7 MD |
2492 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
2493 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
2494 | } |
2495 | ||
2496 | static | |
2497 | void lttng_metadata_end(struct lttng_session *session) | |
2498 | { | |
3e75e2a7 MD |
2499 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
2500 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
2501 | struct lttng_metadata_stream *stream; | |
2502 | ||
3e75e2a7 MD |
2503 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
2504 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 2505 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 2506 | } |
8b97fd42 MD |
2507 | } |
2508 | ||
d83004aa JD |
2509 | /* |
2510 | * Write the metadata to the metadata cache. | |
2511 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
2512 | * The metadata cache lock protects us from concurrent read access from |
2513 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
2514 | * The content of the printf is printed as a single atomic metadata |
2515 | * transaction. | |
d83004aa | 2516 | */ |
a90917c3 | 2517 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
2518 | const char *fmt, ...) |
2519 | { | |
c099397a | 2520 | char *str; |
d83004aa | 2521 | size_t len; |
c099397a MD |
2522 | va_list ap; |
2523 | ||
585e5dcc | 2524 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
2525 | |
2526 | va_start(ap, fmt); | |
2527 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
2528 | va_end(ap); | |
2529 | if (!str) | |
2530 | return -ENOMEM; | |
2531 | ||
1ec3f75a | 2532 | len = strlen(str); |
3e75e2a7 | 2533 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
2534 | if (session->metadata_cache->metadata_written + len > |
2535 | session->metadata_cache->cache_alloc) { | |
2536 | char *tmp_cache_realloc; | |
2537 | unsigned int tmp_cache_alloc_size; | |
2538 | ||
2539 | tmp_cache_alloc_size = max_t(unsigned int, | |
2540 | session->metadata_cache->cache_alloc + len, | |
2541 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 2542 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
2543 | if (!tmp_cache_realloc) |
2544 | goto err; | |
a606b6e8 ML |
2545 | if (session->metadata_cache->data) { |
2546 | memcpy(tmp_cache_realloc, | |
2547 | session->metadata_cache->data, | |
2548 | session->metadata_cache->cache_alloc); | |
2549 | vfree(session->metadata_cache->data); | |
2550 | } | |
2551 | ||
d83004aa JD |
2552 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
2553 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 2554 | } |
d83004aa JD |
2555 | memcpy(session->metadata_cache->data + |
2556 | session->metadata_cache->metadata_written, | |
2557 | str, len); | |
2558 | session->metadata_cache->metadata_written += len; | |
c099397a | 2559 | kfree(str); |
d83004aa | 2560 | |
d83004aa JD |
2561 | return 0; |
2562 | ||
2563 | err: | |
2564 | kfree(str); | |
2565 | return -ENOMEM; | |
c099397a MD |
2566 | } |
2567 | ||
f513b2bf MD |
2568 | static |
2569 | int print_tabs(struct lttng_session *session, size_t nesting) | |
2570 | { | |
2571 | size_t i; | |
2572 | ||
2573 | for (i = 0; i < nesting; i++) { | |
2574 | int ret; | |
2575 | ||
2576 | ret = lttng_metadata_printf(session, " "); | |
2577 | if (ret) { | |
2578 | return ret; | |
2579 | } | |
2580 | } | |
2581 | return 0; | |
2582 | } | |
2583 | ||
ceabb767 MD |
2584 | static |
2585 | int lttng_field_name_statedump(struct lttng_session *session, | |
2586 | const struct lttng_event_field *field, | |
2587 | size_t nesting) | |
2588 | { | |
2589 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
2590 | } | |
2591 | ||
2592 | static | |
2593 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
2594 | const struct lttng_type *type, | |
2595 | size_t nesting) | |
2596 | { | |
2597 | int ret; | |
2598 | ||
2599 | WARN_ON_ONCE(type->atype != atype_integer); | |
2600 | ret = print_tabs(session, nesting); | |
2601 | if (ret) | |
2602 | return ret; | |
2603 | ret = lttng_metadata_printf(session, | |
2604 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
2605 | type->u.integer.size, | |
2606 | type->u.integer.alignment, | |
2607 | type->u.integer.signedness, | |
2608 | (type->u.integer.encoding == lttng_encode_none) | |
2609 | ? "none" | |
2610 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
2611 | ? "UTF8" | |
2612 | : "ASCII", | |
2613 | type->u.integer.base, | |
2614 | #if __BYTE_ORDER == __BIG_ENDIAN | |
2615 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
2616 | #else | |
2617 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
2618 | #endif | |
2619 | ); | |
2620 | return ret; | |
2621 | } | |
2622 | ||
f513b2bf MD |
2623 | /* |
2624 | * Must be called with sessions_mutex held. | |
2625 | */ | |
2626 | static | |
2627 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
2628 | const struct lttng_type *type, | |
2629 | size_t nesting) | |
2630 | { | |
2631 | int ret; | |
2632 | uint32_t i, nr_fields; | |
ceabb767 MD |
2633 | unsigned int alignment; |
2634 | ||
2635 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
2636 | |
2637 | ret = print_tabs(session, nesting); | |
2638 | if (ret) | |
2639 | return ret; | |
2640 | ret = lttng_metadata_printf(session, | |
2641 | "struct {\n"); | |
2642 | if (ret) | |
2643 | return ret; | |
ceabb767 | 2644 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
2645 | for (i = 0; i < nr_fields; i++) { |
2646 | const struct lttng_event_field *iter_field; | |
2647 | ||
ceabb767 | 2648 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
2649 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2650 | if (ret) | |
2651 | return ret; | |
2652 | } | |
2653 | ret = print_tabs(session, nesting); | |
2654 | if (ret) | |
2655 | return ret; | |
ceabb767 MD |
2656 | alignment = type->u.struct_nestable.alignment; |
2657 | if (alignment) { | |
2658 | ret = lttng_metadata_printf(session, | |
2659 | "} align(%u)", | |
2660 | alignment); | |
2661 | } else { | |
2662 | ret = lttng_metadata_printf(session, | |
2663 | "}"); | |
2664 | } | |
f513b2bf MD |
2665 | return ret; |
2666 | } | |
2667 | ||
2668 | /* | |
2669 | * Must be called with sessions_mutex held. | |
2670 | */ | |
2671 | static | |
ceabb767 | 2672 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2673 | const struct lttng_event_field *field, |
2674 | size_t nesting) | |
2675 | { | |
2676 | int ret; | |
2677 | ||
2678 | ret = _lttng_struct_type_statedump(session, | |
2679 | &field->type, nesting); | |
2680 | if (ret) | |
2681 | return ret; | |
ceabb767 | 2682 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2683 | } |
2684 | ||
65c85aa6 MD |
2685 | /* |
2686 | * Must be called with sessions_mutex held. | |
2687 | */ | |
2688 | static | |
2689 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
2690 | const struct lttng_type *type, | |
2691 | size_t nesting) | |
2692 | { | |
2693 | int ret; | |
2694 | uint32_t i, nr_choices; | |
2695 | ||
ceabb767 MD |
2696 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
2697 | /* | |
2698 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
2699 | */ | |
2700 | if (type->u.variant_nestable.alignment != 0) | |
2701 | return -EINVAL; | |
65c85aa6 MD |
2702 | ret = print_tabs(session, nesting); |
2703 | if (ret) | |
2704 | return ret; | |
2705 | ret = lttng_metadata_printf(session, | |
2706 | "variant <_%s> {\n", | |
ceabb767 | 2707 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
2708 | if (ret) |
2709 | return ret; | |
ceabb767 | 2710 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
2711 | for (i = 0; i < nr_choices; i++) { |
2712 | const struct lttng_event_field *iter_field; | |
2713 | ||
ceabb767 | 2714 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
2715 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2716 | if (ret) | |
2717 | return ret; | |
2718 | } | |
2719 | ret = print_tabs(session, nesting); | |
2720 | if (ret) | |
2721 | return ret; | |
2722 | ret = lttng_metadata_printf(session, | |
2723 | "}"); | |
2724 | return ret; | |
2725 | } | |
2726 | ||
2727 | /* | |
2728 | * Must be called with sessions_mutex held. | |
2729 | */ | |
2730 | static | |
ceabb767 | 2731 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
2732 | const struct lttng_event_field *field, |
2733 | size_t nesting) | |
2734 | { | |
2735 | int ret; | |
2736 | ||
2737 | ret = _lttng_variant_type_statedump(session, | |
2738 | &field->type, nesting); | |
2739 | if (ret) | |
2740 | return ret; | |
ceabb767 | 2741 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
2742 | } |
2743 | ||
f513b2bf MD |
2744 | /* |
2745 | * Must be called with sessions_mutex held. | |
2746 | */ | |
2747 | static | |
ceabb767 | 2748 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2749 | const struct lttng_event_field *field, |
2750 | size_t nesting) | |
2751 | { | |
2752 | int ret; | |
2753 | const struct lttng_type *elem_type; | |
2754 | ||
ceabb767 MD |
2755 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
2756 | ||
2757 | if (field->type.u.array_nestable.alignment) { | |
2758 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2759 | if (ret) |
2760 | return ret; | |
ceabb767 MD |
2761 | ret = lttng_metadata_printf(session, |
2762 | "struct { } align(%u) _%s_padding;\n", | |
2763 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
2764 | field->name); | |
2765 | if (ret) | |
2766 | return ret; | |
2767 | } | |
2768 | /* | |
2769 | * Nested compound types: Only array of structures and variants are | |
2770 | * currently supported. | |
2771 | */ | |
2772 | elem_type = field->type.u.array_nestable.elem_type; | |
2773 | switch (elem_type->atype) { | |
2774 | case atype_integer: | |
2775 | case atype_struct_nestable: | |
2776 | case atype_variant_nestable: | |
2777 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2778 | if (ret) |
2779 | return ret; | |
2780 | break; | |
ceabb767 | 2781 | |
f513b2bf MD |
2782 | default: |
2783 | return -EINVAL; | |
2784 | } | |
2785 | ret = lttng_metadata_printf(session, | |
2786 | " _%s[%u];\n", | |
2787 | field->name, | |
ceabb767 | 2788 | field->type.u.array_nestable.length); |
f513b2bf MD |
2789 | return ret; |
2790 | } | |
2791 | ||
2792 | /* | |
2793 | * Must be called with sessions_mutex held. | |
2794 | */ | |
2795 | static | |
ceabb767 | 2796 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2797 | const struct lttng_event_field *field, |
2798 | size_t nesting) | |
2799 | { | |
2800 | int ret; | |
2801 | const char *length_name; | |
2802 | const struct lttng_type *elem_type; | |
2803 | ||
ceabb767 | 2804 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 2805 | |
ceabb767 MD |
2806 | length_name = field->type.u.sequence_nestable.length_name; |
2807 | ||
2808 | if (field->type.u.sequence_nestable.alignment) { | |
2809 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2810 | if (ret) |
2811 | return ret; | |
ceabb767 MD |
2812 | ret = lttng_metadata_printf(session, |
2813 | "struct { } align(%u) _%s_padding;\n", | |
2814 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
2815 | field->name); | |
2816 | if (ret) | |
2817 | return ret; | |
2818 | } | |
2819 | ||
2820 | /* | |
2821 | * Nested compound types: Only array of structures and variants are | |
2822 | * currently supported. | |
2823 | */ | |
2824 | elem_type = field->type.u.sequence_nestable.elem_type; | |
2825 | switch (elem_type->atype) { | |
2826 | case atype_integer: | |
2827 | case atype_struct_nestable: | |
2828 | case atype_variant_nestable: | |
2829 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2830 | if (ret) |
2831 | return ret; | |
2832 | break; | |
ceabb767 | 2833 | |
f513b2bf MD |
2834 | default: |
2835 | return -EINVAL; | |
2836 | } | |
2837 | ret = lttng_metadata_printf(session, | |
2838 | " _%s[ _%s ];\n", | |
2839 | field->name, | |
ceabb767 | 2840 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
2841 | return ret; |
2842 | } | |
2843 | ||
141ddf28 MD |
2844 | /* |
2845 | * Must be called with sessions_mutex held. | |
2846 | */ | |
2847 | static | |
ceabb767 MD |
2848 | int _lttng_enum_type_statedump(struct lttng_session *session, |
2849 | const struct lttng_type *type, | |
141ddf28 MD |
2850 | size_t nesting) |
2851 | { | |
2852 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 2853 | const struct lttng_type *container_type; |
141ddf28 MD |
2854 | int ret; |
2855 | unsigned int i, nr_entries; | |
2856 | ||
ceabb767 MD |
2857 | container_type = type->u.enum_nestable.container_type; |
2858 | if (container_type->atype != atype_integer) { | |
2859 | ret = -EINVAL; | |
2860 | goto end; | |
2861 | } | |
2862 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
2863 | nr_entries = enum_desc->nr_entries; |
2864 | ||
2865 | ret = print_tabs(session, nesting); | |
2866 | if (ret) | |
2867 | goto end; | |
ceabb767 MD |
2868 | ret = lttng_metadata_printf(session, "enum : "); |
2869 | if (ret) | |
2870 | goto end; | |
2871 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 2872 | if (ret) |
ceabb767 MD |
2873 | goto end; |
2874 | ret = lttng_metadata_printf(session, " {\n"); | |
2875 | if (ret) | |
2876 | goto end; | |
141ddf28 MD |
2877 | /* Dump all entries */ |
2878 | for (i = 0; i < nr_entries; i++) { | |
2879 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2880 | int j, len; | |
2881 | ||
2882 | ret = print_tabs(session, nesting + 1); | |
2883 | if (ret) | |
2884 | goto end; | |
2885 | ret = lttng_metadata_printf(session, | |
2886 | "\""); | |
2887 | if (ret) | |
2888 | goto end; | |
2889 | len = strlen(entry->string); | |
2890 | /* Escape the character '"' */ | |
2891 | for (j = 0; j < len; j++) { | |
2892 | char c = entry->string[j]; | |
2893 | ||
2894 | switch (c) { | |
2895 | case '"': | |
2896 | ret = lttng_metadata_printf(session, | |
2897 | "\\\""); | |
2898 | break; | |
2899 | case '\\': | |
2900 | ret = lttng_metadata_printf(session, | |
2901 | "\\\\"); | |
2902 | break; | |
2903 | default: | |
2904 | ret = lttng_metadata_printf(session, | |
2905 | "%c", c); | |
2906 | break; | |
2907 | } | |
2908 | if (ret) | |
2909 | goto end; | |
2910 | } | |
08ad1061 PP |
2911 | ret = lttng_metadata_printf(session, "\""); |
2912 | if (ret) | |
2913 | goto end; | |
2914 | ||
2915 | if (entry->options.is_auto) { | |
2916 | ret = lttng_metadata_printf(session, ",\n"); | |
2917 | if (ret) | |
2918 | goto end; | |
141ddf28 | 2919 | } else { |
7c559490 MD |
2920 | ret = lttng_metadata_printf(session, |
2921 | " = "); | |
2922 | if (ret) | |
2923 | goto end; | |
2924 | if (entry->start.signedness) | |
141ddf28 | 2925 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2926 | "%lld", (long long) entry->start.value); |
2927 | else | |
2928 | ret = lttng_metadata_printf(session, | |
2929 | "%llu", entry->start.value); | |
2930 | if (ret) | |
2931 | goto end; | |
2932 | if (entry->start.signedness == entry->end.signedness && | |
2933 | entry->start.value | |
2934 | == entry->end.value) { | |
141ddf28 | 2935 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2936 | ",\n"); |
2937 | } else { | |
2938 | if (entry->end.signedness) { | |
2939 | ret = lttng_metadata_printf(session, | |
2940 | " ... %lld,\n", | |
2941 | (long long) entry->end.value); | |
2942 | } else { | |
2943 | ret = lttng_metadata_printf(session, | |
2944 | " ... %llu,\n", | |
2945 | entry->end.value); | |
2946 | } | |
141ddf28 | 2947 | } |
7c559490 MD |
2948 | if (ret) |
2949 | goto end; | |
141ddf28 | 2950 | } |
141ddf28 MD |
2951 | } |
2952 | ret = print_tabs(session, nesting); | |
2953 | if (ret) | |
2954 | goto end; | |
ceabb767 | 2955 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
2956 | end: |
2957 | return ret; | |
2958 | } | |
2959 | ||
d83004aa JD |
2960 | /* |
2961 | * Must be called with sessions_mutex held. | |
2962 | */ | |
c099397a | 2963 | static |
ceabb767 MD |
2964 | int _lttng_enum_field_statedump(struct lttng_session *session, |
2965 | const struct lttng_event_field *field, | |
2966 | size_t nesting) | |
2967 | { | |
2968 | int ret; | |
2969 | ||
2970 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
2971 | if (ret) | |
2972 | return ret; | |
2973 | return lttng_field_name_statedump(session, field, nesting); | |
2974 | } | |
2975 | ||
2976 | static | |
2977 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
2978 | const struct lttng_event_field *field, | |
2979 | size_t nesting) | |
2980 | { | |
2981 | int ret; | |
2982 | ||
2983 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
2984 | if (ret) | |
2985 | return ret; | |
2986 | return lttng_field_name_statedump(session, field, nesting); | |
2987 | } | |
2988 | ||
2989 | static | |
2990 | int _lttng_string_type_statedump(struct lttng_session *session, | |
2991 | const struct lttng_type *type, | |
2992 | size_t nesting) | |
2993 | { | |
2994 | int ret; | |
2995 | ||
2996 | WARN_ON_ONCE(type->atype != atype_string); | |
2997 | /* Default encoding is UTF8 */ | |
2998 | ret = print_tabs(session, nesting); | |
2999 | if (ret) | |
3000 | return ret; | |
3001 | ret = lttng_metadata_printf(session, | |
3002 | "string%s", | |
3003 | type->u.string.encoding == lttng_encode_ASCII ? | |
3004 | " { encoding = ASCII; }" : ""); | |
3005 | return ret; | |
3006 | } | |
3007 | ||
3008 | static | |
3009 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
3010 | const struct lttng_event_field *field, |
3011 | size_t nesting) | |
ceabb767 MD |
3012 | { |
3013 | int ret; | |
3014 | ||
3015 | WARN_ON_ONCE(field->type.atype != atype_string); | |
3016 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
3017 | if (ret) | |
3018 | return ret; | |
3019 | return lttng_field_name_statedump(session, field, nesting); | |
3020 | } | |
3021 | ||
3022 | /* | |
3023 | * Must be called with sessions_mutex held. | |
3024 | */ | |
3025 | static | |
3026 | int _lttng_type_statedump(struct lttng_session *session, | |
3027 | const struct lttng_type *type, | |
3028 | size_t nesting) | |
c099397a | 3029 | { |
c099397a | 3030 | int ret = 0; |
c099397a | 3031 | |
ceabb767 | 3032 | switch (type->atype) { |
8070f5c0 | 3033 | case atype_integer: |
ceabb767 | 3034 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 3035 | break; |
ceabb767 MD |
3036 | case atype_enum_nestable: |
3037 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 3038 | break; |
ceabb767 MD |
3039 | case atype_string: |
3040 | ret = _lttng_string_type_statedump(session, type, nesting); | |
3041 | break; | |
3042 | case atype_struct_nestable: | |
3043 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 3044 | break; |
ceabb767 MD |
3045 | case atype_variant_nestable: |
3046 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
3047 | break; | |
3048 | ||
3049 | /* Nested arrays and sequences are not supported yet. */ | |
3050 | case atype_array_nestable: | |
3051 | case atype_sequence_nestable: | |
3052 | default: | |
3053 | WARN_ON_ONCE(1); | |
3054 | return -EINVAL; | |
8070f5c0 | 3055 | } |
ceabb767 MD |
3056 | return ret; |
3057 | } | |
8070f5c0 | 3058 | |
ceabb767 MD |
3059 | /* |
3060 | * Must be called with sessions_mutex held. | |
3061 | */ | |
3062 | static | |
3063 | int _lttng_field_statedump(struct lttng_session *session, | |
3064 | const struct lttng_event_field *field, | |
3065 | size_t nesting) | |
3066 | { | |
3067 | int ret = 0; | |
27d2368e | 3068 | |
ceabb767 MD |
3069 | switch (field->type.atype) { |
3070 | case atype_integer: | |
3071 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
3072 | break; | |
3073 | case atype_enum_nestable: | |
3074 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 3075 | break; |
8070f5c0 | 3076 | case atype_string: |
ceabb767 | 3077 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 3078 | break; |
ceabb767 MD |
3079 | case atype_struct_nestable: |
3080 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 3081 | break; |
ceabb767 MD |
3082 | case atype_array_nestable: |
3083 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 3084 | break; |
ceabb767 MD |
3085 | case atype_sequence_nestable: |
3086 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 3087 | break; |
ceabb767 MD |
3088 | case atype_variant_nestable: |
3089 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 3090 | break; |
f513b2bf | 3091 | |
8070f5c0 MD |
3092 | default: |
3093 | WARN_ON_ONCE(1); | |
3094 | return -EINVAL; | |
3095 | } | |
3096 | return ret; | |
3097 | } | |
3098 | ||
3099 | static | |
a90917c3 | 3100 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
3101 | struct lttng_ctx *ctx) |
3102 | { | |
3103 | int ret = 0; | |
3104 | int i; | |
3105 | ||
3106 | if (!ctx) | |
3107 | return 0; | |
3108 | for (i = 0; i < ctx->nr_fields; i++) { | |
3109 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
3110 | ||
f513b2bf | 3111 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
3112 | if (ret) |
3113 | return ret; | |
3114 | } | |
3115 | return ret; | |
3116 | } | |
3117 | ||
3118 | static | |
a90917c3 MD |
3119 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
3120 | struct lttng_event *event) | |
8070f5c0 MD |
3121 | { |
3122 | const struct lttng_event_desc *desc = event->desc; | |
3123 | int ret = 0; | |
3124 | int i; | |
3125 | ||
3126 | for (i = 0; i < desc->nr_fields; i++) { | |
3127 | const struct lttng_event_field *field = &desc->fields[i]; | |
3128 | ||
f513b2bf | 3129 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
3130 | if (ret) |
3131 | return ret; | |
c099397a MD |
3132 | } |
3133 | return ret; | |
3134 | } | |
3135 | ||
d83004aa JD |
3136 | /* |
3137 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3138 | * The entire event metadata is printed as a single atomic metadata |
3139 | * transaction. | |
d83004aa | 3140 | */ |
c099397a | 3141 | static |
a90917c3 MD |
3142 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
3143 | struct lttng_channel *chan, | |
3144 | struct lttng_event *event) | |
c099397a MD |
3145 | { |
3146 | int ret = 0; | |
3147 | ||
585e5dcc | 3148 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3149 | return 0; |
d83004aa | 3150 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
3151 | return 0; |
3152 | ||
8b97fd42 MD |
3153 | lttng_metadata_begin(session); |
3154 | ||
c099397a MD |
3155 | ret = lttng_metadata_printf(session, |
3156 | "event {\n" | |
ae734547 | 3157 | " name = \"%s\";\n" |
c099397a | 3158 | " id = %u;\n" |
b9074a1b | 3159 | " stream_id = %u;\n", |
c099397a MD |
3160 | event->desc->name, |
3161 | event->id, | |
3162 | event->chan->id); | |
3163 | if (ret) | |
3164 | goto end; | |
3165 | ||
b9074a1b MD |
3166 | if (event->ctx) { |
3167 | ret = lttng_metadata_printf(session, | |
3168 | " context := struct {\n"); | |
3169 | if (ret) | |
3170 | goto end; | |
3171 | } | |
a90917c3 | 3172 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
3173 | if (ret) |
3174 | goto end; | |
b9074a1b MD |
3175 | if (event->ctx) { |
3176 | ret = lttng_metadata_printf(session, | |
3177 | " };\n"); | |
3178 | if (ret) | |
3179 | goto end; | |
3180 | } | |
8070f5c0 MD |
3181 | |
3182 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
3183 | " fields := struct {\n" |
3184 | ); | |
3185 | if (ret) | |
3186 | goto end; | |
3187 | ||
a90917c3 | 3188 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
3189 | if (ret) |
3190 | goto end; | |
3191 | ||
3192 | /* | |
3193 | * LTTng space reservation can only reserve multiples of the | |
3194 | * byte size. | |
3195 | */ | |
3196 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3197 | " };\n" |
3198 | "};\n\n"); | |
c099397a MD |
3199 | if (ret) |
3200 | goto end; | |
3201 | ||
c099397a MD |
3202 | event->metadata_dumped = 1; |
3203 | end: | |
8b97fd42 | 3204 | lttng_metadata_end(session); |
c099397a MD |
3205 | return ret; |
3206 | ||
3207 | } | |
3208 | ||
d83004aa JD |
3209 | /* |
3210 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
3211 | * The entire channel metadata is printed as a single atomic metadata |
3212 | * transaction. | |
d83004aa | 3213 | */ |
c099397a | 3214 | static |
a90917c3 MD |
3215 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
3216 | struct lttng_channel *chan) | |
c099397a MD |
3217 | { |
3218 | int ret = 0; | |
3219 | ||
585e5dcc | 3220 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 3221 | return 0; |
d83004aa JD |
3222 | |
3223 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
3224 | return 0; |
3225 | ||
8b97fd42 MD |
3226 | lttng_metadata_begin(session); |
3227 | ||
c099397a MD |
3228 | WARN_ON_ONCE(!chan->header_type); |
3229 | ret = lttng_metadata_printf(session, | |
3230 | "stream {\n" | |
3231 | " id = %u;\n" | |
9115fbdc | 3232 | " event.header := %s;\n" |
b9074a1b | 3233 | " packet.context := struct packet_context;\n", |
c099397a MD |
3234 | chan->id, |
3235 | chan->header_type == 1 ? "struct event_header_compact" : | |
3236 | "struct event_header_large"); | |
3237 | if (ret) | |
3238 | goto end; | |
3239 | ||
b9074a1b MD |
3240 | if (chan->ctx) { |
3241 | ret = lttng_metadata_printf(session, | |
3242 | " event.context := struct {\n"); | |
3243 | if (ret) | |
3244 | goto end; | |
3245 | } | |
a90917c3 | 3246 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
3247 | if (ret) |
3248 | goto end; | |
b9074a1b MD |
3249 | if (chan->ctx) { |
3250 | ret = lttng_metadata_printf(session, | |
3251 | " };\n"); | |
3252 | if (ret) | |
3253 | goto end; | |
3254 | } | |
8070f5c0 MD |
3255 | |
3256 | ret = lttng_metadata_printf(session, | |
b9074a1b | 3257 | "};\n\n"); |
8070f5c0 | 3258 | |
c099397a MD |
3259 | chan->metadata_dumped = 1; |
3260 | end: | |
8b97fd42 | 3261 | lttng_metadata_end(session); |
c099397a MD |
3262 | return ret; |
3263 | } | |
3264 | ||
d83004aa JD |
3265 | /* |
3266 | * Must be called with sessions_mutex held. | |
3267 | */ | |
9115fbdc | 3268 | static |
a90917c3 | 3269 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
3270 | { |
3271 | return lttng_metadata_printf(session, | |
3272 | "struct packet_context {\n" | |
a3ccff4f MD |
3273 | " uint64_clock_monotonic_t timestamp_begin;\n" |
3274 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
3275 | " uint64_t content_size;\n" |
3276 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 3277 | " uint64_t packet_seq_num;\n" |
a9afe705 | 3278 | " unsigned long events_discarded;\n" |
9115fbdc | 3279 | " uint32_t cpu_id;\n" |
c6dfdf6f | 3280 | "};\n\n" |
9115fbdc MD |
3281 | ); |
3282 | } | |
3283 | ||
3284 | /* | |
3285 | * Compact header: | |
3286 | * id: range: 0 - 30. | |
3287 | * id 31 is reserved to indicate an extended header. | |
3288 | * | |
3289 | * Large header: | |
3290 | * id: range: 0 - 65534. | |
3291 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
3292 | * |
3293 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
3294 | */ |
3295 | static | |
a90917c3 | 3296 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
3297 | { |
3298 | return lttng_metadata_printf(session, | |
3299 | "struct event_header_compact {\n" | |
3300 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
3301 | " variant <id> {\n" | |
3302 | " struct {\n" | |
a3ccff4f | 3303 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3304 | " } compact;\n" |
3305 | " struct {\n" | |
3306 | " uint32_t id;\n" | |
a3ccff4f | 3307 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3308 | " } extended;\n" |
3309 | " } v;\n" | |
3310 | "} align(%u);\n" | |
3311 | "\n" | |
3312 | "struct event_header_large {\n" | |
3313 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
3314 | " variant <id> {\n" | |
3315 | " struct {\n" | |
a3ccff4f | 3316 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3317 | " } compact;\n" |
3318 | " struct {\n" | |
3319 | " uint32_t id;\n" | |
a3ccff4f | 3320 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
3321 | " } extended;\n" |
3322 | " } v;\n" | |
3323 | "} align(%u);\n\n", | |
a90917c3 MD |
3324 | lttng_alignof(uint32_t) * CHAR_BIT, |
3325 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
3326 | ); |
3327 | } | |
3328 | ||
a3ccff4f MD |
3329 | /* |
3330 | * Approximation of NTP time of day to clock monotonic correlation, | |
3331 | * taken at start of trace. | |
3332 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
3333 | * in future versions. | |
5283350b MD |
3334 | * This function may return a negative offset. It may happen if the |
3335 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
3336 | * |
3337 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
3338 | * y2038 compliant. | |
a3ccff4f MD |
3339 | */ |
3340 | static | |
8967b2a3 | 3341 | int64_t measure_clock_offset(void) |
a3ccff4f | 3342 | { |
dcb93448 | 3343 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 3344 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 3345 | int64_t offset; |
a3ccff4f | 3346 | unsigned long flags; |
3636085f MJ |
3347 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3348 | struct timespec64 rts = { 0, 0 }; | |
3349 | #else | |
3350 | struct timespec rts = { 0, 0 }; | |
3351 | #endif | |
a3ccff4f MD |
3352 | |
3353 | /* Disable interrupts to increase correlation precision. */ | |
3354 | local_irq_save(flags); | |
3355 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
3356 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
3357 | ktime_get_real_ts64(&rts); | |
3358 | #else | |
216b6baa | 3359 | getnstimeofday(&rts); |
3636085f | 3360 | #endif |
a3ccff4f MD |
3361 | monotonic[1] = trace_clock_read64(); |
3362 | local_irq_restore(flags); | |
3363 | ||
dcb93448 | 3364 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
3365 | realtime = (uint64_t) rts.tv_sec * tcf; |
3366 | if (tcf == NSEC_PER_SEC) { | |
3367 | realtime += rts.tv_nsec; | |
3368 | } else { | |
3369 | uint64_t n = rts.tv_nsec * tcf; | |
3370 | ||
3371 | do_div(n, NSEC_PER_SEC); | |
3372 | realtime += n; | |
3373 | } | |
dcb93448 | 3374 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
3375 | return offset; |
3376 | } | |
3377 | ||
3eb95be4 JR |
3378 | static |
3379 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
3380 | { | |
0f3eaad4 | 3381 | int ret = 0; |
3eb95be4 JR |
3382 | size_t i; |
3383 | char cur; | |
3384 | ||
3385 | i = 0; | |
3386 | cur = string[i]; | |
3387 | while (cur != '\0') { | |
3388 | switch (cur) { | |
3389 | case '\n': | |
3390 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
3391 | break; | |
3392 | case '\\': | |
3393 | case '"': | |
3394 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
3395 | if (ret) | |
3396 | goto error; | |
3397 | /* We still print the current char */ | |
3398 | /* Fallthrough */ | |
3399 | default: | |
3400 | ret = lttng_metadata_printf(session, "%c", cur); | |
3401 | break; | |
3402 | } | |
3403 | ||
3404 | if (ret) | |
3405 | goto error; | |
3406 | ||
3407 | cur = string[++i]; | |
3408 | } | |
3409 | error: | |
3410 | return ret; | |
3411 | } | |
3412 | ||
3413 | static | |
1c88f269 JR |
3414 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
3415 | const char *field_value) | |
3eb95be4 JR |
3416 | { |
3417 | int ret; | |
3418 | ||
1c88f269 | 3419 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
3420 | if (ret) |
3421 | goto error; | |
3422 | ||
1c88f269 | 3423 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
3424 | if (ret) |
3425 | goto error; | |
3426 | ||
3427 | ret = lttng_metadata_printf(session, "\";\n"); | |
3428 | ||
3429 | error: | |
3430 | return ret; | |
3431 | } | |
3432 | ||
c099397a MD |
3433 | /* |
3434 | * Output metadata into this session's metadata buffers. | |
d83004aa | 3435 | * Must be called with sessions_mutex held. |
c099397a MD |
3436 | */ |
3437 | static | |
a90917c3 | 3438 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 3439 | { |
30bdb6e4 | 3440 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 3441 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 3442 | const char *product_uuid; |
a90917c3 MD |
3443 | struct lttng_channel *chan; |
3444 | struct lttng_event *event; | |
c099397a MD |
3445 | int ret = 0; |
3446 | ||
585e5dcc | 3447 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 3448 | return 0; |
8b97fd42 MD |
3449 | |
3450 | lttng_metadata_begin(session); | |
3451 | ||
c099397a MD |
3452 | if (session->metadata_dumped) |
3453 | goto skip_session; | |
c099397a | 3454 | |
d793d5e1 | 3455 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
3456 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
3457 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
3458 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
3459 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
3460 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
3461 | |
3462 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
3463 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
3464 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
3465 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
3466 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 3467 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
3468 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
3469 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
3470 | "\n" |
3471 | "trace {\n" | |
3472 | " major = %u;\n" | |
3473 | " minor = %u;\n" | |
30bdb6e4 | 3474 | " uuid = \"%s\";\n" |
d793d5e1 MD |
3475 | " byte_order = %s;\n" |
3476 | " packet.header := struct {\n" | |
3477 | " uint32_t magic;\n" | |
1ec3f75a | 3478 | " uint8_t uuid[16];\n" |
d793d5e1 | 3479 | " uint32_t stream_id;\n" |
5594698f | 3480 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 3481 | " };\n" |
d793d5e1 | 3482 | "};\n\n", |
a90917c3 MD |
3483 | lttng_alignof(uint8_t) * CHAR_BIT, |
3484 | lttng_alignof(uint16_t) * CHAR_BIT, | |
3485 | lttng_alignof(uint32_t) * CHAR_BIT, | |
3486 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
3487 | sizeof(unsigned long) * CHAR_BIT, |
3488 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
3489 | CTF_SPEC_MAJOR, |
3490 | CTF_SPEC_MINOR, | |
d793d5e1 | 3491 | uuid_s, |
5214fa50 | 3492 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
3493 | "be" |
3494 | #else | |
3495 | "le" | |
3496 | #endif | |
3497 | ); | |
3498 | if (ret) | |
3499 | goto end; | |
3500 | ||
99dc9597 MD |
3501 | ret = lttng_metadata_printf(session, |
3502 | "env {\n" | |
a6058143 | 3503 | " hostname = \"%s\";\n" |
c6c9e10f | 3504 | " domain = \"kernel\";\n" |
99dc9597 | 3505 | " sysname = \"%s\";\n" |
c6c9e10f MD |
3506 | " kernel_release = \"%s\";\n" |
3507 | " kernel_version = \"%s\";\n" | |
3508 | " tracer_name = \"lttng-modules\";\n" | |
3509 | " tracer_major = %d;\n" | |
3510 | " tracer_minor = %d;\n" | |
3511 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 3512 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 3513 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
3514 | utsname()->sysname, |
3515 | utsname()->release, | |
c6c9e10f MD |
3516 | utsname()->version, |
3517 | LTTNG_MODULES_MAJOR_VERSION, | |
3518 | LTTNG_MODULES_MINOR_VERSION, | |
3519 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
3520 | ); |
3521 | if (ret) | |
3522 | goto end; | |
3523 | ||
1c88f269 JR |
3524 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
3525 | if (ret) | |
3526 | goto end; | |
3527 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
3528 | session->creation_time); | |
3eb95be4 JR |
3529 | if (ret) |
3530 | goto end; | |
3531 | ||
c88f762e GB |
3532 | /* Add the product UUID to the 'env' section */ |
3533 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
3534 | if (product_uuid) { | |
3535 | ret = lttng_metadata_printf(session, | |
3536 | " product_uuid = \"%s\";\n", | |
3537 | product_uuid | |
3538 | ); | |
3539 | if (ret) | |
3540 | goto end; | |
3541 | } | |
3542 | ||
3543 | /* Close the 'env' section */ | |
3eb95be4 JR |
3544 | ret = lttng_metadata_printf(session, "};\n\n"); |
3545 | if (ret) | |
3546 | goto end; | |
3547 | ||
a3ccff4f MD |
3548 | ret = lttng_metadata_printf(session, |
3549 | "clock {\n" | |
2754583e MD |
3550 | " name = \"%s\";\n", |
3551 | trace_clock_name() | |
a82c63f1 MD |
3552 | ); |
3553 | if (ret) | |
3554 | goto end; | |
3555 | ||
3556 | if (!trace_clock_uuid(clock_uuid_s)) { | |
3557 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 3558 | " uuid = \"%s\";\n", |
a82c63f1 MD |
3559 | clock_uuid_s |
3560 | ); | |
3561 | if (ret) | |
3562 | goto end; | |
3563 | } | |
3564 | ||
3565 | ret = lttng_metadata_printf(session, | |
2754583e | 3566 | " description = \"%s\";\n" |
a3ccff4f MD |
3567 | " freq = %llu; /* Frequency, in Hz */\n" |
3568 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 3569 | " offset = %lld;\n" |
a3ccff4f | 3570 | "};\n\n", |
2754583e | 3571 | trace_clock_description(), |
a3ccff4f | 3572 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 3573 | (long long) measure_clock_offset() |
a3ccff4f MD |
3574 | ); |
3575 | if (ret) | |
3576 | goto end; | |
3577 | ||
3578 | ret = lttng_metadata_printf(session, | |
3579 | "typealias integer {\n" | |
3580 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 3581 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3582 | "} := uint27_clock_monotonic_t;\n" |
3583 | "\n" | |
3584 | "typealias integer {\n" | |
3585 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 3586 | " map = clock.%s.value;\n" |
a3ccff4f MD |
3587 | "} := uint32_clock_monotonic_t;\n" |
3588 | "\n" | |
3589 | "typealias integer {\n" | |
3590 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 3591 | " map = clock.%s.value;\n" |
a3ccff4f | 3592 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 3593 | trace_clock_name(), |
a3ccff4f | 3594 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
3595 | trace_clock_name(), |
3596 | lttng_alignof(uint64_t) * CHAR_BIT, | |
3597 | trace_clock_name() | |
a3ccff4f MD |
3598 | ); |
3599 | if (ret) | |
3600 | goto end; | |
3601 | ||
a90917c3 | 3602 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
3603 | if (ret) |
3604 | goto end; | |
3605 | ||
a90917c3 | 3606 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
3607 | if (ret) |
3608 | goto end; | |
3609 | ||
c099397a MD |
3610 | skip_session: |
3611 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 3612 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
3613 | if (ret) |
3614 | goto end; | |
3615 | } | |
3616 | ||
3617 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 3618 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
3619 | if (ret) |
3620 | goto end; | |
3621 | } | |
3622 | session->metadata_dumped = 1; | |
3623 | end: | |
8b97fd42 | 3624 | lttng_metadata_end(session); |
c099397a MD |
3625 | return ret; |
3626 | } | |
3627 | ||
c0e31d2e | 3628 | /** |
a90917c3 | 3629 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
3630 | * @transport: transport structure |
3631 | * | |
3632 | * Registers a transport which can be used as output to extract the data out of | |
3633 | * LTTng. The module calling this registration function must ensure that no | |
3634 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 3635 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 3636 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 3637 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
3638 | * after its registration must it synchronize the TLBs. |
3639 | */ | |
a90917c3 | 3640 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
3641 | { |
3642 | /* | |
3643 | * Make sure no page fault can be triggered by the module about to be | |
3644 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 3645 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 3646 | */ |
263b6c88 | 3647 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
3648 | |
3649 | mutex_lock(&sessions_mutex); | |
a90917c3 | 3650 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
3651 | mutex_unlock(&sessions_mutex); |
3652 | } | |
a90917c3 | 3653 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
3654 | |
3655 | /** | |
a90917c3 | 3656 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
3657 | * @transport: transport structure |
3658 | */ | |
a90917c3 | 3659 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
3660 | { |
3661 | mutex_lock(&sessions_mutex); | |
3662 | list_del(&transport->node); | |
3663 | mutex_unlock(&sessions_mutex); | |
3664 | } | |
a90917c3 | 3665 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 3666 | |
894ce5dc | 3667 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
3668 | |
3669 | enum cpuhp_state lttng_hp_prepare; | |
3670 | enum cpuhp_state lttng_hp_online; | |
3671 | ||
3672 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
3673 | { | |
3674 | struct lttng_cpuhp_node *lttng_node; | |
3675 | ||
3676 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3677 | switch (lttng_node->component) { | |
3678 | case LTTNG_RING_BUFFER_FRONTEND: | |
3679 | return 0; | |
3680 | case LTTNG_RING_BUFFER_BACKEND: | |
3681 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
3682 | case LTTNG_RING_BUFFER_ITER: | |
3683 | return 0; | |
3684 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3685 | return 0; | |
3686 | default: | |
3687 | return -EINVAL; | |
3688 | } | |
3689 | } | |
3690 | ||
3691 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
3692 | { | |
3693 | struct lttng_cpuhp_node *lttng_node; | |
3694 | ||
3695 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3696 | switch (lttng_node->component) { | |
3697 | case LTTNG_RING_BUFFER_FRONTEND: | |
3698 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
3699 | case LTTNG_RING_BUFFER_BACKEND: | |
3700 | return 0; | |
3701 | case LTTNG_RING_BUFFER_ITER: | |
3702 | return 0; | |
3703 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3704 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
3705 | default: | |
3706 | return -EINVAL; | |
3707 | } | |
3708 | } | |
3709 | ||
3710 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
3711 | { | |
3712 | struct lttng_cpuhp_node *lttng_node; | |
3713 | ||
3714 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3715 | switch (lttng_node->component) { | |
3716 | case LTTNG_RING_BUFFER_FRONTEND: | |
3717 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
3718 | case LTTNG_RING_BUFFER_BACKEND: | |
3719 | return 0; | |
3720 | case LTTNG_RING_BUFFER_ITER: | |
3721 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
3722 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3723 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
3724 | default: | |
3725 | return -EINVAL; | |
3726 | } | |
3727 | } | |
3728 | ||
3729 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
3730 | { | |
3731 | struct lttng_cpuhp_node *lttng_node; | |
3732 | ||
3733 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3734 | switch (lttng_node->component) { | |
3735 | case LTTNG_RING_BUFFER_FRONTEND: | |
3736 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
3737 | case LTTNG_RING_BUFFER_BACKEND: | |
3738 | return 0; | |
3739 | case LTTNG_RING_BUFFER_ITER: | |
3740 | return 0; | |
3741 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3742 | return 0; | |
3743 | default: | |
3744 | return -EINVAL; | |
3745 | } | |
3746 | } | |
3747 | ||
3748 | static int __init lttng_init_cpu_hotplug(void) | |
3749 | { | |
3750 | int ret; | |
3751 | ||
3752 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
3753 | lttng_hotplug_prepare, | |
3754 | lttng_hotplug_dead); | |
3755 | if (ret < 0) { | |
3756 | return ret; | |
3757 | } | |
3758 | lttng_hp_prepare = ret; | |
3759 | lttng_rb_set_hp_prepare(ret); | |
3760 | ||
3761 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
3762 | lttng_hotplug_online, | |
3763 | lttng_hotplug_offline); | |
3764 | if (ret < 0) { | |
3765 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3766 | lttng_hp_prepare = 0; | |
3767 | return ret; | |
3768 | } | |
3769 | lttng_hp_online = ret; | |
3770 | lttng_rb_set_hp_online(ret); | |
3771 | ||
3772 | return 0; | |
3773 | } | |
3774 | ||
3775 | static void __exit lttng_exit_cpu_hotplug(void) | |
3776 | { | |
3777 | lttng_rb_set_hp_online(0); | |
3778 | cpuhp_remove_multi_state(lttng_hp_online); | |
3779 | lttng_rb_set_hp_prepare(0); | |
3780 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3781 | } | |
3782 | ||
1ee63d8d | 3783 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3784 | static int lttng_init_cpu_hotplug(void) |
3785 | { | |
3786 | return 0; | |
3787 | } | |
3788 | static void lttng_exit_cpu_hotplug(void) | |
3789 | { | |
3790 | } | |
1ee63d8d | 3791 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3792 | |
3793 | ||
a90917c3 | 3794 | static int __init lttng_events_init(void) |
4e3c1b9b | 3795 | { |
1c25284c MD |
3796 | int ret; |
3797 | ||
453b2495 JD |
3798 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
3799 | if (ret) | |
3800 | return ret; | |
389d7070 | 3801 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
3802 | if (ret) |
3803 | return ret; | |
3804 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
3805 | if (ret) |
3806 | return ret; | |
3807 | ret = lttng_probes_init(); | |
389d7070 MD |
3808 | if (ret) |
3809 | return ret; | |
07dfc1d0 | 3810 | ret = lttng_context_init(); |
20591cf7 MD |
3811 | if (ret) |
3812 | return ret; | |
07dfc1d0 MD |
3813 | ret = lttng_tracepoint_init(); |
3814 | if (ret) | |
3815 | goto error_tp; | |
a90917c3 | 3816 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
3817 | if (!event_cache) { |
3818 | ret = -ENOMEM; | |
dffef45d FD |
3819 | goto error_kmem_event; |
3820 | } | |
3821 | event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0); | |
3822 | if (!event_notifier_cache) { | |
3823 | ret = -ENOMEM; | |
3824 | goto error_kmem_event_notifier; | |
20591cf7 | 3825 | } |
80996790 | 3826 | ret = lttng_abi_init(); |
02119ee5 MD |
3827 | if (ret) |
3828 | goto error_abi; | |
0c956676 MD |
3829 | ret = lttng_logger_init(); |
3830 | if (ret) | |
3831 | goto error_logger; | |
1e367326 MD |
3832 | ret = lttng_init_cpu_hotplug(); |
3833 | if (ret) | |
3834 | goto error_hotplug; | |
101215b7 | 3835 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3836 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3837 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3838 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3839 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3840 | LTTNG_VERSION_NAME, |
3841 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3842 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3843 | #else | |
3844 | "", | |
3845 | #endif | |
3846 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3847 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3848 | #else | |
3849 | ""); | |
3850 | #endif | |
4e3c1b9b | 3851 | return 0; |
0c956676 | 3852 | |
1e367326 MD |
3853 | error_hotplug: |
3854 | lttng_logger_exit(); | |
0c956676 MD |
3855 | error_logger: |
3856 | lttng_abi_exit(); | |
02119ee5 | 3857 | error_abi: |
dffef45d FD |
3858 | kmem_cache_destroy(event_notifier_cache); |
3859 | error_kmem_event_notifier: | |
1c25284c | 3860 | kmem_cache_destroy(event_cache); |
dffef45d | 3861 | error_kmem_event: |
20591cf7 | 3862 | lttng_tracepoint_exit(); |
07dfc1d0 MD |
3863 | error_tp: |
3864 | lttng_context_exit(); | |
101215b7 | 3865 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3866 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3867 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3868 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3869 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3870 | LTTNG_VERSION_NAME, |
3871 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3872 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3873 | #else | |
3874 | "", | |
3875 | #endif | |
3876 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3877 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3878 | #else | |
3879 | ""); | |
3880 | #endif | |
1c25284c | 3881 | return ret; |
4e3c1b9b MD |
3882 | } |
3883 | ||
a90917c3 | 3884 | module_init(lttng_events_init); |
11b5a3c2 | 3885 | |
a90917c3 | 3886 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 3887 | { |
a90917c3 | 3888 | struct lttng_session *session, *tmpsession; |
92e94819 | 3889 | |
1e367326 | 3890 | lttng_exit_cpu_hotplug(); |
0c956676 | 3891 | lttng_logger_exit(); |
80996790 | 3892 | lttng_abi_exit(); |
92e94819 | 3893 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 3894 | lttng_session_destroy(session); |
11b5a3c2 | 3895 | kmem_cache_destroy(event_cache); |
dffef45d | 3896 | kmem_cache_destroy(event_notifier_cache); |
20591cf7 | 3897 | lttng_tracepoint_exit(); |
07dfc1d0 | 3898 | lttng_context_exit(); |
101215b7 | 3899 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3900 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3901 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3902 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3903 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3904 | LTTNG_VERSION_NAME, |
3905 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3906 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3907 | #else | |
3908 | "", | |
3909 | #endif | |
3910 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3911 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3912 | #else | |
3913 | ""); | |
3914 | #endif | |
4e3c1b9b | 3915 | } |
92e94819 | 3916 | |
a90917c3 | 3917 | module_exit(lttng_events_exit); |
11b5a3c2 | 3918 | |
7ca11e77 | 3919 | #include <generated/patches.h> |
101215b7 MJ |
3920 | #ifdef LTTNG_EXTRA_VERSION_GIT |
3921 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3922 | #endif | |
3923 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3924 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3925 | #endif | |
92e94819 MD |
3926 | MODULE_LICENSE("GPL and additional rights"); |
3927 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3928 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3929 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3930 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3931 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3932 | LTTNG_MODULES_EXTRAVERSION); |