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 | ||
10 | #include <linux/module.h> | |
c0e31d2e MD |
11 | #include <linux/mutex.h> |
12 | #include <linux/sched.h> | |
11b5a3c2 | 13 | #include <linux/slab.h> |
c099397a | 14 | #include <linux/jiffies.h> |
99dc9597 | 15 | #include <linux/utsname.h> |
abc0446a | 16 | #include <linux/err.h> |
7e6f9ef6 MD |
17 | #include <linux/seq_file.h> |
18 | #include <linux/file.h> | |
19 | #include <linux/anon_inodes.h> | |
3c997079 | 20 | #include <linux/jhash.h> |
8c6e7f13 | 21 | #include <linux/uaccess.h> |
41f229dc | 22 | #include <linux/uuid.h> |
c88f762e | 23 | #include <linux/dmi.h> |
c50bdba2 | 24 | #include <linux/vmalloc.h> |
48ccd619 | 25 | #include <linux/limits.h> |
3c997079 | 26 | |
241ae9a8 | 27 | #include <wrapper/random.h> |
241ae9a8 MD |
28 | #include <wrapper/list.h> |
29 | #include <lttng-kernel-version.h> | |
30 | #include <lttng-events.h> | |
31 | #include <lttng-tracer.h> | |
32 | #include <lttng-abi-old.h> | |
5214fa50 | 33 | #include <lttng-endian.h> |
4993071a | 34 | #include <lttng-string-utils.h> |
0d260d3d | 35 | #include <lttng-tracepoint.h> |
64af2437 MD |
36 | #include <wrapper/ringbuffer/backend.h> |
37 | #include <wrapper/ringbuffer/frontend.h> | |
4e3c1b9b | 38 | |
d83004aa JD |
39 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
40 | ||
4e3c1b9b | 41 | static LIST_HEAD(sessions); |
a90917c3 | 42 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
43 | /* |
44 | * Protect the sessions and metadata caches. | |
45 | */ | |
4e3c1b9b MD |
46 | static DEFINE_MUTEX(sessions_mutex); |
47 | static struct kmem_cache *event_cache; | |
48 | ||
3c997079 MD |
49 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
50 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
51 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
52 | ||
a90917c3 MD |
53 | static void _lttng_event_destroy(struct lttng_event *event); |
54 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
55 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 56 | static |
a90917c3 MD |
57 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
58 | struct lttng_channel *chan, | |
59 | struct lttng_event *event); | |
c099397a | 60 | static |
a90917c3 | 61 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
62 | static |
63 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 64 | static |
ceabb767 MD |
65 | int _lttng_type_statedump(struct lttng_session *session, |
66 | const struct lttng_type *type, | |
67 | size_t nesting); | |
68 | static | |
f513b2bf MD |
69 | int _lttng_field_statedump(struct lttng_session *session, |
70 | const struct lttng_event_field *field, | |
71 | size_t nesting); | |
c099397a | 72 | |
c099397a | 73 | void synchronize_trace(void) |
abcca994 | 74 | { |
92da05ce MJ |
75 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
76 | synchronize_rcu(); | |
77 | #else | |
abcca994 | 78 | synchronize_sched(); |
92da05ce MJ |
79 | #endif |
80 | ||
b8590f40 MD |
81 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
82 | #ifdef CONFIG_PREEMPT_RT_FULL | |
83 | synchronize_rcu(); | |
84 | #endif | |
85 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
86 | #ifdef CONFIG_PREEMPT_RT |
87 | synchronize_rcu(); | |
88 | #endif | |
b8590f40 | 89 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
90 | } |
91 | ||
3c997079 MD |
92 | void lttng_lock_sessions(void) |
93 | { | |
94 | mutex_lock(&sessions_mutex); | |
95 | } | |
96 | ||
97 | void lttng_unlock_sessions(void) | |
98 | { | |
99 | mutex_unlock(&sessions_mutex); | |
100 | } | |
101 | ||
102 | /* | |
103 | * Called with sessions lock held. | |
104 | */ | |
105 | int lttng_session_active(void) | |
106 | { | |
107 | struct lttng_session *iter; | |
108 | ||
109 | list_for_each_entry(iter, &sessions, list) { | |
110 | if (iter->active) | |
111 | return 1; | |
112 | } | |
113 | return 0; | |
114 | } | |
115 | ||
a90917c3 | 116 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 117 | { |
a90917c3 | 118 | struct lttng_session *session; |
d83004aa | 119 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 120 | int i; |
4e3c1b9b MD |
121 | |
122 | mutex_lock(&sessions_mutex); | |
c50bdba2 MD |
123 | session = kvzalloc_node(sizeof(struct lttng_session), GFP_KERNEL, |
124 | NUMA_NO_NODE); | |
4e3c1b9b | 125 | if (!session) |
d83004aa | 126 | goto err; |
4e3c1b9b | 127 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 128 | INIT_LIST_HEAD(&session->events); |
496a7e97 | 129 | guid_gen(&session->uuid); |
d83004aa JD |
130 | |
131 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
132 | GFP_KERNEL); | |
133 | if (!metadata_cache) | |
134 | goto err_free_session; | |
0ca42eb7 | 135 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
136 | if (!metadata_cache->data) |
137 | goto err_free_cache; | |
138 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
139 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 140 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
141 | session->metadata_cache = metadata_cache; |
142 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
143 | memcpy(&metadata_cache->uuid, &session->uuid, |
144 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
145 | INIT_LIST_HEAD(&session->enablers_head); |
146 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
147 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 148 | list_add(&session->list, &sessions); |
d1f652f8 MD |
149 | session->pid_tracker.session = session; |
150 | session->pid_tracker.tracker_type = TRACKER_PID; | |
151 | session->vpid_tracker.session = session; | |
152 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
153 | session->uid_tracker.session = session; | |
154 | session->uid_tracker.tracker_type = TRACKER_UID; | |
155 | session->vuid_tracker.session = session; | |
156 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
157 | session->gid_tracker.session = session; | |
158 | session->gid_tracker.tracker_type = TRACKER_GID; | |
159 | session->vgid_tracker.session = session; | |
160 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
161 | mutex_unlock(&sessions_mutex); |
162 | return session; | |
d83004aa JD |
163 | |
164 | err_free_cache: | |
165 | kfree(metadata_cache); | |
166 | err_free_session: | |
c50bdba2 | 167 | kvfree(session); |
d83004aa JD |
168 | err: |
169 | mutex_unlock(&sessions_mutex); | |
170 | return NULL; | |
171 | } | |
172 | ||
173 | void metadata_cache_destroy(struct kref *kref) | |
174 | { | |
175 | struct lttng_metadata_cache *cache = | |
176 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 177 | vfree(cache->data); |
d83004aa | 178 | kfree(cache); |
4e3c1b9b MD |
179 | } |
180 | ||
a90917c3 | 181 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 182 | { |
a90917c3 MD |
183 | struct lttng_channel *chan, *tmpchan; |
184 | struct lttng_event *event, *tmpevent; | |
d83004aa | 185 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 186 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 187 | int ret; |
4e3c1b9b MD |
188 | |
189 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 190 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
191 | list_for_each_entry(chan, &session->chan, list) { |
192 | ret = lttng_syscalls_unregister(chan); | |
193 | WARN_ON(ret); | |
194 | } | |
dda6a249 | 195 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 196 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
197 | WARN_ON(ret); |
198 | } | |
abcca994 | 199 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
200 | list_for_each_entry_safe(enabler, tmpenabler, |
201 | &session->enablers_head, node) | |
202 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 203 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 204 | _lttng_event_destroy(event); |
d83004aa JD |
205 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
206 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 207 | _lttng_channel_destroy(chan); |
d83004aa JD |
208 | } |
209 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
210 | _lttng_metadata_channel_hangup(metadata_stream); | |
d1f652f8 MD |
211 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
212 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
213 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
214 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
215 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
216 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 217 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
218 | list_del(&session->list); |
219 | mutex_unlock(&sessions_mutex); | |
c50bdba2 | 220 | kvfree(session); |
4e3c1b9b MD |
221 | } |
222 | ||
601252cf MD |
223 | int lttng_session_statedump(struct lttng_session *session) |
224 | { | |
225 | int ret; | |
226 | ||
227 | mutex_lock(&sessions_mutex); | |
228 | ret = lttng_statedump_start(session); | |
229 | mutex_unlock(&sessions_mutex); | |
230 | return ret; | |
231 | } | |
232 | ||
a90917c3 | 233 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
234 | { |
235 | int ret = 0; | |
a90917c3 | 236 | struct lttng_channel *chan; |
c0e31d2e MD |
237 | |
238 | mutex_lock(&sessions_mutex); | |
239 | if (session->active) { | |
240 | ret = -EBUSY; | |
241 | goto end; | |
242 | } | |
c099397a | 243 | |
3c997079 MD |
244 | /* Set transient enabler state to "enabled" */ |
245 | session->tstate = 1; | |
246 | ||
4ef81e4a MD |
247 | /* We need to sync enablers with session before activation. */ |
248 | lttng_session_sync_enablers(session); | |
249 | ||
c099397a MD |
250 | /* |
251 | * Snapshot the number of events per channel to know the type of header | |
252 | * we need to use. | |
253 | */ | |
254 | list_for_each_entry(chan, &session->chan, list) { | |
255 | if (chan->header_type) | |
256 | continue; /* don't change it if session stop/restart */ | |
257 | if (chan->free_event_id < 31) | |
258 | chan->header_type = 1; /* compact */ | |
259 | else | |
260 | chan->header_type = 2; /* large */ | |
261 | } | |
262 | ||
64af2437 | 263 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
264 | list_for_each_entry(chan, &session->chan, list) { |
265 | if (chan->channel_type != METADATA_CHANNEL) | |
266 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
267 | } | |
64af2437 | 268 | |
a8f2d0c7 MJ |
269 | WRITE_ONCE(session->active, 1); |
270 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 271 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 272 | if (ret) { |
a8f2d0c7 | 273 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
274 | goto end; |
275 | } | |
276 | ret = lttng_statedump_start(session); | |
360f38ea | 277 | if (ret) |
a8f2d0c7 | 278 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
279 | end: |
280 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 281 | return ret; |
c0e31d2e MD |
282 | } |
283 | ||
a90917c3 | 284 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
285 | { |
286 | int ret = 0; | |
64af2437 | 287 | struct lttng_channel *chan; |
c0e31d2e MD |
288 | |
289 | mutex_lock(&sessions_mutex); | |
290 | if (!session->active) { | |
291 | ret = -EBUSY; | |
292 | goto end; | |
293 | } | |
a8f2d0c7 | 294 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
295 | |
296 | /* Set transient enabler state to "disabled" */ | |
297 | session->tstate = 0; | |
298 | lttng_session_sync_enablers(session); | |
64af2437 MD |
299 | |
300 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
301 | list_for_each_entry(chan, &session->chan, list) { |
302 | if (chan->channel_type != METADATA_CHANNEL) | |
303 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
304 | } | |
c0e31d2e MD |
305 | end: |
306 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 307 | return ret; |
c0e31d2e MD |
308 | } |
309 | ||
9616f0bf JD |
310 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
311 | { | |
312 | int ret = 0; | |
313 | struct lttng_channel *chan; | |
314 | struct lttng_event *event; | |
315 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
316 | struct lttng_metadata_stream *stream; | |
317 | ||
318 | mutex_lock(&sessions_mutex); | |
319 | if (!session->active) { | |
320 | ret = -EBUSY; | |
321 | goto end; | |
322 | } | |
323 | ||
324 | mutex_lock(&cache->lock); | |
325 | memset(cache->data, 0, cache->cache_alloc); | |
326 | cache->metadata_written = 0; | |
327 | cache->version++; | |
328 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
329 | stream->metadata_out = 0; | |
330 | stream->metadata_in = 0; | |
331 | } | |
332 | mutex_unlock(&cache->lock); | |
333 | ||
334 | session->metadata_dumped = 0; | |
335 | list_for_each_entry(chan, &session->chan, list) { | |
336 | chan->metadata_dumped = 0; | |
337 | } | |
338 | ||
339 | list_for_each_entry(event, &session->events, list) { | |
340 | event->metadata_dumped = 0; | |
341 | } | |
342 | ||
343 | ret = _lttng_session_metadata_statedump(session); | |
344 | ||
345 | end: | |
346 | mutex_unlock(&sessions_mutex); | |
347 | return ret; | |
348 | } | |
349 | ||
a90917c3 | 350 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 351 | { |
3c997079 | 352 | int ret = 0; |
e64957da | 353 | |
3c997079 MD |
354 | mutex_lock(&sessions_mutex); |
355 | if (channel->channel_type == METADATA_CHANNEL) { | |
356 | ret = -EPERM; | |
357 | goto end; | |
358 | } | |
359 | if (channel->enabled) { | |
360 | ret = -EEXIST; | |
361 | goto end; | |
362 | } | |
363 | /* Set transient enabler state to "enabled" */ | |
364 | channel->tstate = 1; | |
365 | lttng_session_sync_enablers(channel->session); | |
366 | /* Set atomically the state to "enabled" */ | |
a8f2d0c7 | 367 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
368 | end: |
369 | mutex_unlock(&sessions_mutex); | |
370 | return ret; | |
e64957da MD |
371 | } |
372 | ||
a90917c3 | 373 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 374 | { |
3c997079 | 375 | int ret = 0; |
e64957da | 376 | |
3c997079 MD |
377 | mutex_lock(&sessions_mutex); |
378 | if (channel->channel_type == METADATA_CHANNEL) { | |
379 | ret = -EPERM; | |
380 | goto end; | |
381 | } | |
382 | if (!channel->enabled) { | |
383 | ret = -EEXIST; | |
384 | goto end; | |
385 | } | |
386 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 387 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
388 | /* Set transient enabler state to "enabled" */ |
389 | channel->tstate = 0; | |
390 | lttng_session_sync_enablers(channel->session); | |
391 | end: | |
392 | mutex_unlock(&sessions_mutex); | |
393 | return ret; | |
e64957da MD |
394 | } |
395 | ||
a90917c3 | 396 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 397 | { |
3c997079 | 398 | int ret = 0; |
e64957da | 399 | |
3c997079 MD |
400 | mutex_lock(&sessions_mutex); |
401 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
402 | ret = -EPERM; | |
403 | goto end; | |
404 | } | |
405 | if (event->enabled) { | |
406 | ret = -EEXIST; | |
407 | goto end; | |
408 | } | |
a0493bef MD |
409 | switch (event->instrumentation) { |
410 | case LTTNG_KERNEL_TRACEPOINT: | |
411 | case LTTNG_KERNEL_SYSCALL: | |
412 | ret = -EINVAL; | |
413 | break; | |
414 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 415 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 416 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 417 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
418 | break; |
419 | case LTTNG_KERNEL_KRETPROBE: | |
420 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
421 | break; | |
e884017c | 422 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
423 | default: |
424 | WARN_ON_ONCE(1); | |
425 | ret = -EINVAL; | |
426 | } | |
3c997079 MD |
427 | end: |
428 | mutex_unlock(&sessions_mutex); | |
429 | return ret; | |
e64957da MD |
430 | } |
431 | ||
a90917c3 | 432 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 433 | { |
3c997079 | 434 | int ret = 0; |
e64957da | 435 | |
3c997079 MD |
436 | mutex_lock(&sessions_mutex); |
437 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
438 | ret = -EPERM; | |
439 | goto end; | |
440 | } | |
441 | if (!event->enabled) { | |
442 | ret = -EEXIST; | |
443 | goto end; | |
444 | } | |
a0493bef MD |
445 | switch (event->instrumentation) { |
446 | case LTTNG_KERNEL_TRACEPOINT: | |
447 | case LTTNG_KERNEL_SYSCALL: | |
448 | ret = -EINVAL; | |
449 | break; | |
450 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 451 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 452 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 453 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
454 | break; |
455 | case LTTNG_KERNEL_KRETPROBE: | |
456 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
457 | break; | |
e884017c | 458 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
459 | default: |
460 | WARN_ON_ONCE(1); | |
461 | ret = -EINVAL; | |
462 | } | |
3c997079 MD |
463 | end: |
464 | mutex_unlock(&sessions_mutex); | |
465 | return ret; | |
e64957da MD |
466 | } |
467 | ||
a90917c3 | 468 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 469 | { |
a90917c3 | 470 | struct lttng_transport *transport; |
f3d01b96 | 471 | |
a90917c3 | 472 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
473 | if (!strcmp(transport->name, name)) |
474 | return transport; | |
475 | } | |
476 | return NULL; | |
477 | } | |
478 | ||
a90917c3 | 479 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
480 | const char *transport_name, |
481 | void *buf_addr, | |
4e3c1b9b MD |
482 | size_t subbuf_size, size_t num_subbuf, |
483 | unsigned int switch_timer_interval, | |
d83004aa JD |
484 | unsigned int read_timer_interval, |
485 | enum channel_type channel_type) | |
4e3c1b9b | 486 | { |
a90917c3 MD |
487 | struct lttng_channel *chan; |
488 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
489 | |
490 | mutex_lock(&sessions_mutex); | |
d83004aa | 491 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 492 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 493 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
494 | if (!transport) { |
495 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
496 | transport_name); | |
c0e31d2e | 497 | goto notransport; |
f3d01b96 | 498 | } |
a33c9927 MD |
499 | if (!try_module_get(transport->owner)) { |
500 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
501 | goto notransport; | |
502 | } | |
a90917c3 | 503 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 504 | if (!chan) |
c0e31d2e | 505 | goto nomem; |
4e3c1b9b | 506 | chan->session = session; |
05d32c64 | 507 | chan->id = session->free_chan_id++; |
3b731ab1 | 508 | chan->ops = &transport->ops; |
125b4df4 MD |
509 | /* |
510 | * Note: the channel creation op already writes into the packet | |
511 | * headers. Therefore the "chan" information used as input | |
512 | * should be already accessible. | |
513 | */ | |
5f5ddf01 MD |
514 | chan->chan = transport->ops.channel_create(transport_name, |
515 | chan, buf_addr, subbuf_size, num_subbuf, | |
516 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
517 | if (!chan->chan) |
518 | goto create_error; | |
3c997079 | 519 | chan->tstate = 1; |
e64957da | 520 | chan->enabled = 1; |
a33c9927 | 521 | chan->transport = transport; |
d83004aa | 522 | chan->channel_type = channel_type; |
4e3c1b9b MD |
523 | list_add(&chan->list, &session->chan); |
524 | mutex_unlock(&sessions_mutex); | |
525 | return chan; | |
526 | ||
f3d01b96 MD |
527 | create_error: |
528 | kfree(chan); | |
c0e31d2e | 529 | nomem: |
a33c9927 MD |
530 | if (transport) |
531 | module_put(transport->owner); | |
c0e31d2e | 532 | notransport: |
e5382b6d | 533 | active: |
4e3c1b9b MD |
534 | mutex_unlock(&sessions_mutex); |
535 | return NULL; | |
536 | } | |
537 | ||
538 | /* | |
d83004aa JD |
539 | * Only used internally at session destruction for per-cpu channels, and |
540 | * when metadata channel is released. | |
541 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 542 | */ |
aa7c23a9 | 543 | static |
a90917c3 | 544 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 545 | { |
11b5a3c2 | 546 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 547 | module_put(chan->transport->owner); |
4e3c1b9b | 548 | list_del(&chan->list); |
8070f5c0 | 549 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
550 | kfree(chan); |
551 | } | |
552 | ||
d83004aa JD |
553 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
554 | { | |
555 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
556 | ||
557 | /* Protect the metadata cache with the sessions_mutex. */ | |
558 | mutex_lock(&sessions_mutex); | |
559 | _lttng_channel_destroy(chan); | |
560 | mutex_unlock(&sessions_mutex); | |
561 | } | |
562 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
563 | ||
564 | static | |
565 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
566 | { | |
567 | stream->finalized = 1; | |
568 | wake_up_interruptible(&stream->read_wait); | |
569 | } | |
570 | ||
e5382b6d MD |
571 | /* |
572 | * Supports event creation while tracing session is active. | |
3c997079 | 573 | * Needs to be called with sessions mutex held. |
e5382b6d | 574 | */ |
3c997079 MD |
575 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
576 | struct lttng_kernel_event *event_param, | |
577 | void *filter, | |
578 | const struct lttng_event_desc *event_desc, | |
579 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 580 | { |
3c997079 | 581 | struct lttng_session *session = chan->session; |
a90917c3 | 582 | struct lttng_event *event; |
3c997079 MD |
583 | const char *event_name; |
584 | struct hlist_head *head; | |
585 | size_t name_len; | |
586 | uint32_t hash; | |
3d084699 | 587 | int ret; |
4e3c1b9b | 588 | |
abc0446a | 589 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 590 | ret = -EMFILE; |
e5382b6d | 591 | goto full; |
abc0446a | 592 | } |
3c997079 MD |
593 | |
594 | switch (itype) { | |
595 | case LTTNG_KERNEL_TRACEPOINT: | |
596 | event_name = event_desc->name; | |
597 | break; | |
598 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 599 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 600 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 601 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 602 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
603 | event_name = event_param->name; |
604 | break; | |
e884017c | 605 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
606 | default: |
607 | WARN_ON_ONCE(1); | |
608 | ret = -EINVAL; | |
609 | goto type_error; | |
610 | } | |
611 | name_len = strlen(event_name); | |
612 | hash = jhash(event_name, name_len, 0); | |
613 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 614 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
615 | WARN_ON_ONCE(!event->desc); |
616 | if (!strncmp(event->desc->name, event_name, | |
617 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
618 | && chan == event->chan) { | |
619 | ret = -EEXIST; | |
620 | goto exist; | |
abc0446a MD |
621 | } |
622 | } | |
3c997079 | 623 | |
11b5a3c2 | 624 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 625 | if (!event) { |
4cf0bf51 | 626 | ret = -ENOMEM; |
4e3c1b9b | 627 | goto cache_error; |
abc0446a | 628 | } |
4e3c1b9b MD |
629 | event->chan = chan; |
630 | event->filter = filter; | |
e5382b6d | 631 | event->id = chan->free_event_id++; |
3c997079 MD |
632 | event->instrumentation = itype; |
633 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 634 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
635 | INIT_LIST_HEAD(&event->enablers_ref_head); |
636 | ||
637 | switch (itype) { | |
ab2277d6 | 638 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
639 | /* Event will be enabled by enabler sync. */ |
640 | event->enabled = 0; | |
641 | event->registered = 0; | |
642 | event->desc = lttng_event_get(event_name); | |
abc0446a | 643 | if (!event->desc) { |
4cf0bf51 | 644 | ret = -ENOENT; |
d3dbe23c | 645 | goto register_error; |
abc0446a | 646 | } |
3c997079 MD |
647 | /* Populate lttng_event structure before event registration. */ |
648 | smp_wmb(); | |
baf20995 | 649 | break; |
ab2277d6 | 650 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
651 | /* |
652 | * Needs to be explicitly enabled after creation, since | |
653 | * we may want to apply filters. | |
654 | */ | |
655 | event->enabled = 0; | |
3c997079 MD |
656 | event->registered = 1; |
657 | /* | |
658 | * Populate lttng_event structure before event | |
659 | * registration. | |
660 | */ | |
661 | smp_wmb(); | |
662 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
663 | event_param->u.kprobe.symbol_name, |
664 | event_param->u.kprobe.offset, | |
665 | event_param->u.kprobe.addr, | |
666 | event); | |
abc0446a | 667 | if (ret) { |
4cf0bf51 | 668 | ret = -EINVAL; |
d6d808f3 | 669 | goto register_error; |
abc0446a | 670 | } |
edeb3137 MD |
671 | ret = try_module_get(event->desc->owner); |
672 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 673 | break; |
7371f44c MD |
674 | case LTTNG_KERNEL_KRETPROBE: |
675 | { | |
a90917c3 | 676 | struct lttng_event *event_return; |
7371f44c MD |
677 | |
678 | /* kretprobe defines 2 events */ | |
a0493bef MD |
679 | /* |
680 | * Needs to be explicitly enabled after creation, since | |
681 | * we may want to apply filters. | |
682 | */ | |
683 | event->enabled = 0; | |
3c997079 | 684 | event->registered = 1; |
7371f44c MD |
685 | event_return = |
686 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 687 | if (!event_return) { |
4cf0bf51 | 688 | ret = -ENOMEM; |
7371f44c | 689 | goto register_error; |
abc0446a | 690 | } |
7371f44c MD |
691 | event_return->chan = chan; |
692 | event_return->filter = filter; | |
693 | event_return->id = chan->free_event_id++; | |
a0493bef | 694 | event_return->enabled = 0; |
3c997079 MD |
695 | event_return->registered = 1; |
696 | event_return->instrumentation = itype; | |
7371f44c | 697 | /* |
a90917c3 | 698 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
699 | */ |
700 | smp_wmb(); | |
3c997079 | 701 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
702 | event_param->u.kretprobe.symbol_name, |
703 | event_param->u.kretprobe.offset, | |
704 | event_param->u.kretprobe.addr, | |
705 | event, event_return); | |
706 | if (ret) { | |
707 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 708 | ret = -EINVAL; |
7371f44c MD |
709 | goto register_error; |
710 | } | |
711 | /* Take 2 refs on the module: one per event. */ | |
712 | ret = try_module_get(event->desc->owner); | |
713 | WARN_ON_ONCE(!ret); | |
714 | ret = try_module_get(event->desc->owner); | |
715 | WARN_ON_ONCE(!ret); | |
a90917c3 | 716 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 717 | event_return); |
abc0446a | 718 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
719 | if (ret) { |
720 | kmem_cache_free(event_cache, event_return); | |
721 | module_put(event->desc->owner); | |
722 | module_put(event->desc->owner); | |
723 | goto statedump_error; | |
724 | } | |
725 | list_add(&event_return->list, &chan->session->events); | |
726 | break; | |
727 | } | |
1ec65de1 | 728 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 729 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
730 | /* |
731 | * Needs to be explicitly enabled after creation, since | |
732 | * we may want to apply filters. | |
733 | */ | |
734 | event->enabled = 0; | |
3c997079 MD |
735 | event->registered = 0; |
736 | event->desc = event_desc; | |
abc0446a | 737 | if (!event->desc) { |
4cf0bf51 | 738 | ret = -EINVAL; |
259b6cb3 | 739 | goto register_error; |
abc0446a | 740 | } |
1ec65de1 | 741 | break; |
149b9a9d | 742 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
743 | /* |
744 | * Needs to be explicitly enabled after creation, since | |
745 | * we may want to apply filters. | |
746 | */ | |
747 | event->enabled = 0; | |
748 | event->registered = 1; | |
3aed4dca | 749 | |
a344f64b FD |
750 | /* |
751 | * Populate lttng_event structure before event | |
752 | * registration. | |
753 | */ | |
754 | smp_wmb(); | |
149b9a9d YB |
755 | |
756 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 757 | event_param->u.uprobe.fd, |
149b9a9d YB |
758 | event); |
759 | if (ret) | |
760 | goto register_error; | |
761 | ret = try_module_get(event->desc->owner); | |
762 | WARN_ON_ONCE(!ret); | |
763 | break; | |
e884017c | 764 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
765 | default: |
766 | WARN_ON_ONCE(1); | |
4cf0bf51 | 767 | ret = -EINVAL; |
df07930b | 768 | goto register_error; |
baf20995 | 769 | } |
a90917c3 | 770 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
771 | WARN_ON_ONCE(ret > 0); |
772 | if (ret) { | |
c099397a | 773 | goto statedump_error; |
abc0446a | 774 | } |
3c997079 | 775 | hlist_add_head(&event->hlist, head); |
dda6a249 | 776 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
777 | return event; |
778 | ||
c099397a | 779 | statedump_error: |
259b6cb3 | 780 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 781 | register_error: |
11b5a3c2 | 782 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
783 | cache_error: |
784 | exist: | |
3c997079 | 785 | type_error: |
e5382b6d | 786 | full: |
4cf0bf51 | 787 | return ERR_PTR(ret); |
4e3c1b9b MD |
788 | } |
789 | ||
3c997079 MD |
790 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
791 | struct lttng_kernel_event *event_param, | |
792 | void *filter, | |
793 | const struct lttng_event_desc *event_desc, | |
794 | enum lttng_kernel_instrumentation itype) | |
795 | { | |
796 | struct lttng_event *event; | |
797 | ||
798 | mutex_lock(&sessions_mutex); | |
799 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
800 | itype); | |
801 | mutex_unlock(&sessions_mutex); | |
802 | return event; | |
803 | } | |
804 | ||
805 | /* Only used for tracepoints for now. */ | |
806 | static | |
807 | void register_event(struct lttng_event *event) | |
808 | { | |
809 | const struct lttng_event_desc *desc; | |
f127e61e | 810 | int ret = -EINVAL; |
3c997079 | 811 | |
3c997079 MD |
812 | if (event->registered) |
813 | return; | |
4ecb5ad5 | 814 | |
3c997079 | 815 | desc = event->desc; |
4ecb5ad5 MD |
816 | switch (event->instrumentation) { |
817 | case LTTNG_KERNEL_TRACEPOINT: | |
0d260d3d MD |
818 | ret = lttng_tracepoint_probe_register(desc->kname, |
819 | desc->probe_callback, | |
820 | event); | |
4ecb5ad5 MD |
821 | break; |
822 | case LTTNG_KERNEL_SYSCALL: | |
823 | ret = lttng_syscall_filter_enable(event->chan, | |
824 | desc->name); | |
825 | break; | |
826 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 827 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 828 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
829 | case LTTNG_KERNEL_NOOP: |
830 | ret = 0; | |
831 | break; | |
e884017c | 832 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
833 | default: |
834 | WARN_ON_ONCE(1); | |
835 | } | |
3c997079 MD |
836 | if (!ret) |
837 | event->registered = 1; | |
838 | } | |
839 | ||
4e3c1b9b MD |
840 | /* |
841 | * Only used internally at session destruction. | |
842 | */ | |
a90917c3 | 843 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 844 | { |
4ecb5ad5 | 845 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
846 | int ret = -EINVAL; |
847 | ||
3c997079 MD |
848 | if (!event->registered) |
849 | return 0; | |
850 | ||
4ecb5ad5 | 851 | desc = event->desc; |
38d024ae | 852 | switch (event->instrumentation) { |
ab2277d6 | 853 | case LTTNG_KERNEL_TRACEPOINT: |
0d260d3d | 854 | ret = lttng_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 855 | event->desc->probe_callback, |
11b5a3c2 | 856 | event); |
baf20995 | 857 | break; |
ab2277d6 | 858 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 859 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
860 | ret = 0; |
861 | break; | |
7371f44c MD |
862 | case LTTNG_KERNEL_KRETPROBE: |
863 | lttng_kretprobes_unregister(event); | |
864 | ret = 0; | |
865 | break; | |
33a39a3c | 866 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
867 | ret = lttng_syscall_filter_disable(event->chan, |
868 | desc->name); | |
869 | break; | |
870 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
871 | ret = 0; |
872 | break; | |
149b9a9d YB |
873 | case LTTNG_KERNEL_UPROBE: |
874 | lttng_uprobes_unregister(event); | |
875 | ret = 0; | |
876 | break; | |
e884017c | 877 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
878 | default: |
879 | WARN_ON_ONCE(1); | |
880 | } | |
3c997079 MD |
881 | if (!ret) |
882 | event->registered = 0; | |
dda6a249 MD |
883 | return ret; |
884 | } | |
885 | ||
886 | /* | |
887 | * Only used internally at session destruction. | |
888 | */ | |
be066e6c | 889 | static |
a90917c3 | 890 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 891 | { |
edeb3137 MD |
892 | switch (event->instrumentation) { |
893 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 894 | lttng_event_put(event->desc); |
edeb3137 MD |
895 | break; |
896 | case LTTNG_KERNEL_KPROBE: | |
897 | module_put(event->desc->owner); | |
898 | lttng_kprobes_destroy_private(event); | |
899 | break; | |
7371f44c MD |
900 | case LTTNG_KERNEL_KRETPROBE: |
901 | module_put(event->desc->owner); | |
902 | lttng_kretprobes_destroy_private(event); | |
903 | break; | |
259b6cb3 | 904 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 905 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 906 | break; |
149b9a9d YB |
907 | case LTTNG_KERNEL_UPROBE: |
908 | module_put(event->desc->owner); | |
909 | lttng_uprobes_destroy_private(event); | |
910 | break; | |
e884017c | 911 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
912 | default: |
913 | WARN_ON_ONCE(1); | |
914 | } | |
dda6a249 | 915 | list_del(&event->list); |
8070f5c0 | 916 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 917 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
918 | } |
919 | ||
d1f652f8 MD |
920 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
921 | enum tracker_type tracker_type) | |
e0130fab | 922 | { |
d1f652f8 MD |
923 | switch (tracker_type) { |
924 | case TRACKER_PID: | |
925 | return &session->pid_tracker; | |
926 | case TRACKER_VPID: | |
927 | return &session->vpid_tracker; | |
928 | case TRACKER_UID: | |
929 | return &session->uid_tracker; | |
930 | case TRACKER_VUID: | |
931 | return &session->vuid_tracker; | |
932 | case TRACKER_GID: | |
933 | return &session->gid_tracker; | |
934 | case TRACKER_VGID: | |
935 | return &session->vgid_tracker; | |
936 | default: | |
937 | WARN_ON_ONCE(1); | |
938 | return NULL; | |
939 | } | |
940 | } | |
941 | ||
942 | int lttng_session_track_id(struct lttng_session *session, | |
943 | enum tracker_type tracker_type, int id) | |
944 | { | |
945 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
946 | int ret; |
947 | ||
d1f652f8 MD |
948 | tracker = get_tracker(session, tracker_type); |
949 | if (!tracker) | |
950 | return -EINVAL; | |
951 | if (id < -1) | |
e0130fab MD |
952 | return -EINVAL; |
953 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
954 | if (id == -1) { |
955 | /* track all ids: destroy tracker. */ | |
956 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
957 | ret = 0; |
958 | } else { | |
d1f652f8 | 959 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 960 | } |
e0130fab MD |
961 | mutex_unlock(&sessions_mutex); |
962 | return ret; | |
963 | } | |
964 | ||
d1f652f8 MD |
965 | int lttng_session_untrack_id(struct lttng_session *session, |
966 | enum tracker_type tracker_type, int id) | |
e0130fab | 967 | { |
d1f652f8 | 968 | struct lttng_id_tracker *tracker; |
e0130fab MD |
969 | int ret; |
970 | ||
d1f652f8 MD |
971 | tracker = get_tracker(session, tracker_type); |
972 | if (!tracker) | |
973 | return -EINVAL; | |
974 | if (id < -1) | |
e0130fab MD |
975 | return -EINVAL; |
976 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
977 | if (id == -1) { |
978 | /* untrack all ids: replace by empty tracker. */ | |
979 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 980 | } else { |
d1f652f8 | 981 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 982 | } |
e0130fab MD |
983 | mutex_unlock(&sessions_mutex); |
984 | return ret; | |
985 | } | |
986 | ||
7e6f9ef6 | 987 | static |
d1f652f8 | 988 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 989 | { |
d1f652f8 MD |
990 | struct lttng_id_tracker *id_tracker = m->private; |
991 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
992 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
993 | int iter = 0, i; |
994 | ||
995 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
996 | if (id_tracker_p) { |
997 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
998 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 999 | |
f934e302 | 1000 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1001 | if (iter++ >= *pos) |
1002 | return e; | |
1003 | } | |
1004 | } | |
1005 | } else { | |
d1f652f8 | 1006 | /* ID tracker disabled. */ |
7e6f9ef6 | 1007 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1008 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1009 | } |
1010 | iter++; | |
1011 | } | |
1012 | /* End of list */ | |
1013 | return NULL; | |
1014 | } | |
1015 | ||
1016 | /* Called with sessions_mutex held. */ | |
1017 | static | |
d1f652f8 | 1018 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1019 | { |
d1f652f8 MD |
1020 | struct lttng_id_tracker *id_tracker = m->private; |
1021 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1022 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1023 | int iter = 0, i; |
1024 | ||
1025 | (*ppos)++; | |
d1f652f8 MD |
1026 | if (id_tracker_p) { |
1027 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1028 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1029 | |
f934e302 | 1030 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1031 | if (iter++ >= *ppos) |
1032 | return e; | |
1033 | } | |
1034 | } | |
1035 | } else { | |
d1f652f8 | 1036 | /* ID tracker disabled. */ |
7e6f9ef6 | 1037 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1038 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1039 | iter++; |
1040 | } | |
1041 | ||
1042 | /* End of list */ | |
1043 | return NULL; | |
1044 | } | |
1045 | ||
1046 | static | |
d1f652f8 | 1047 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1048 | { |
1049 | mutex_unlock(&sessions_mutex); | |
1050 | } | |
1051 | ||
1052 | static | |
d1f652f8 | 1053 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1054 | { |
d1f652f8 MD |
1055 | struct lttng_id_tracker *id_tracker = m->private; |
1056 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1057 | int id; | |
7e6f9ef6 | 1058 | |
d1f652f8 | 1059 | if (p == id_tracker_p) { |
7e6f9ef6 | 1060 | /* Tracker disabled. */ |
d1f652f8 | 1061 | id = -1; |
7e6f9ef6 | 1062 | } else { |
d1f652f8 | 1063 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1064 | |
d1f652f8 MD |
1065 | id = lttng_id_tracker_get_node_id(e); |
1066 | } | |
1067 | switch (id_tracker->tracker_type) { | |
1068 | case TRACKER_PID: | |
1069 | seq_printf(m, "process { pid = %d; };\n", id); | |
1070 | break; | |
1071 | case TRACKER_VPID: | |
1072 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1073 | break; | |
1074 | case TRACKER_UID: | |
1075 | seq_printf(m, "user { uid = %d; };\n", id); | |
1076 | break; | |
1077 | case TRACKER_VUID: | |
1078 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1079 | break; | |
1080 | case TRACKER_GID: | |
1081 | seq_printf(m, "group { gid = %d; };\n", id); | |
1082 | break; | |
1083 | case TRACKER_VGID: | |
1084 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1085 | break; | |
1086 | default: | |
1087 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1088 | } |
7e6f9ef6 MD |
1089 | return 0; |
1090 | } | |
1091 | ||
1092 | static | |
d1f652f8 MD |
1093 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1094 | .start = id_list_start, | |
1095 | .next = id_list_next, | |
1096 | .stop = id_list_stop, | |
1097 | .show = id_list_show, | |
7e6f9ef6 MD |
1098 | }; |
1099 | ||
1100 | static | |
d1f652f8 | 1101 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1102 | { |
d1f652f8 | 1103 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1104 | } |
1105 | ||
1106 | static | |
d1f652f8 | 1107 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1108 | { |
1109 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1110 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1111 | int ret; |
1112 | ||
d1f652f8 | 1113 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1114 | ret = seq_release(inode, file); |
d1f652f8 MD |
1115 | if (!ret) |
1116 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1117 | return ret; |
1118 | } | |
1119 | ||
d1f652f8 | 1120 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1121 | .owner = THIS_MODULE, |
d1f652f8 | 1122 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1123 | .read = seq_read, |
1124 | .llseek = seq_lseek, | |
d1f652f8 | 1125 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1126 | }; |
1127 | ||
d1f652f8 MD |
1128 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1129 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1130 | { |
d1f652f8 | 1131 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1132 | struct seq_file *m; |
1133 | int file_fd, ret; | |
1134 | ||
34522739 | 1135 | file_fd = get_unused_fd_flags(0); |
7e6f9ef6 MD |
1136 | if (file_fd < 0) { |
1137 | ret = file_fd; | |
1138 | goto fd_error; | |
1139 | } | |
1140 | ||
d1f652f8 MD |
1141 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1142 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1143 | NULL, O_RDWR); |
d1f652f8 MD |
1144 | if (IS_ERR(tracker_ids_list_file)) { |
1145 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1146 | goto file_error; |
1147 | } | |
98d7281c MJ |
1148 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1149 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1150 | goto refcount_error; |
1151 | } | |
d1f652f8 | 1152 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1153 | if (ret < 0) |
1154 | goto open_error; | |
d1f652f8 MD |
1155 | m = tracker_ids_list_file->private_data; |
1156 | ||
1157 | m->private = get_tracker(session, tracker_type); | |
1158 | BUG_ON(!m->private); | |
1159 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1160 | |
1161 | return file_fd; | |
1162 | ||
1163 | open_error: | |
9c1f4643 MD |
1164 | atomic_long_dec(&session->file->f_count); |
1165 | refcount_error: | |
d1f652f8 | 1166 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1167 | file_error: |
1168 | put_unused_fd(file_fd); | |
1169 | fd_error: | |
1170 | return ret; | |
1171 | } | |
1172 | ||
3c997079 MD |
1173 | /* |
1174 | * Enabler management. | |
1175 | */ | |
1176 | static | |
4993071a PP |
1177 | int lttng_match_enabler_star_glob(const char *desc_name, |
1178 | const char *pattern) | |
3c997079 | 1179 | { |
48ccd619 MD |
1180 | if (!strutils_star_glob_match(pattern, SIZE_MAX, |
1181 | desc_name, SIZE_MAX)) | |
3c997079 MD |
1182 | return 0; |
1183 | return 1; | |
1184 | } | |
1185 | ||
1186 | static | |
4ecb5ad5 MD |
1187 | int lttng_match_enabler_name(const char *desc_name, |
1188 | const char *name) | |
3c997079 | 1189 | { |
4ecb5ad5 | 1190 | if (strcmp(desc_name, name)) |
3c997079 MD |
1191 | return 0; |
1192 | return 1; | |
1193 | } | |
1194 | ||
1195 | static | |
1196 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1197 | struct lttng_enabler *enabler) | |
1198 | { | |
4ecb5ad5 MD |
1199 | const char *desc_name, *enabler_name; |
1200 | ||
1201 | enabler_name = enabler->event_param.name; | |
1202 | switch (enabler->event_param.instrumentation) { | |
1203 | case LTTNG_KERNEL_TRACEPOINT: | |
1204 | desc_name = desc->name; | |
1205 | break; | |
1206 | case LTTNG_KERNEL_SYSCALL: | |
1207 | desc_name = desc->name; | |
1208 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1209 | desc_name += strlen("compat_"); | |
1210 | if (!strncmp(desc_name, "syscall_exit_", | |
1211 | strlen("syscall_exit_"))) { | |
1212 | desc_name += strlen("syscall_exit_"); | |
1213 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1214 | strlen("syscall_entry_"))) { | |
1215 | desc_name += strlen("syscall_entry_"); | |
1216 | } else { | |
1217 | WARN_ON_ONCE(1); | |
1218 | return -EINVAL; | |
1219 | } | |
1220 | break; | |
1221 | default: | |
1222 | WARN_ON_ONCE(1); | |
1223 | return -EINVAL; | |
1224 | } | |
3c997079 | 1225 | switch (enabler->type) { |
4993071a PP |
1226 | case LTTNG_ENABLER_STAR_GLOB: |
1227 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
3c997079 | 1228 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1229 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1230 | default: |
1231 | return -EINVAL; | |
1232 | } | |
1233 | } | |
1234 | ||
1235 | static | |
1236 | int lttng_event_match_enabler(struct lttng_event *event, | |
1237 | struct lttng_enabler *enabler) | |
1238 | { | |
33a39a3c MD |
1239 | if (enabler->event_param.instrumentation != event->instrumentation) |
1240 | return 0; | |
3c997079 MD |
1241 | if (lttng_desc_match_enabler(event->desc, enabler) |
1242 | && event->chan == enabler->chan) | |
1243 | return 1; | |
1244 | else | |
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | static | |
1249 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1250 | struct lttng_enabler *enabler) | |
1251 | { | |
1252 | struct lttng_enabler_ref *enabler_ref; | |
1253 | ||
1254 | list_for_each_entry(enabler_ref, | |
1255 | &event->enablers_ref_head, node) { | |
1256 | if (enabler_ref->ref == enabler) | |
1257 | return enabler_ref; | |
1258 | } | |
1259 | return NULL; | |
1260 | } | |
1261 | ||
3c997079 | 1262 | static |
33a39a3c | 1263 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1264 | { |
1265 | struct lttng_session *session = enabler->chan->session; | |
1266 | struct lttng_probe_desc *probe_desc; | |
1267 | const struct lttng_event_desc *desc; | |
1268 | int i; | |
1269 | struct list_head *probe_list; | |
1270 | ||
1271 | probe_list = lttng_get_probe_list_head(); | |
1272 | /* | |
1273 | * For each probe event, if we find that a probe event matches | |
1274 | * our enabler, create an associated lttng_event if not | |
1275 | * already present. | |
1276 | */ | |
1277 | list_for_each_entry(probe_desc, probe_list, head) { | |
1278 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1279 | int found = 0; | |
1280 | struct hlist_head *head; | |
1281 | const char *event_name; | |
1282 | size_t name_len; | |
1283 | uint32_t hash; | |
1284 | struct lttng_event *event; | |
1285 | ||
1286 | desc = probe_desc->event_desc[i]; | |
1287 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1288 | continue; | |
1289 | event_name = desc->name; | |
1290 | name_len = strlen(event_name); | |
1291 | ||
1292 | /* | |
1293 | * Check if already created. | |
1294 | */ | |
1295 | hash = jhash(event_name, name_len, 0); | |
1296 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1297 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1298 | if (event->desc == desc |
1299 | && event->chan == enabler->chan) | |
1300 | found = 1; | |
1301 | } | |
1302 | if (found) | |
1303 | continue; | |
1304 | ||
1305 | /* | |
1306 | * We need to create an event for this | |
1307 | * event probe. | |
1308 | */ | |
1309 | event = _lttng_event_create(enabler->chan, | |
1310 | NULL, NULL, desc, | |
1311 | LTTNG_KERNEL_TRACEPOINT); | |
1312 | if (!event) { | |
1313 | printk(KERN_INFO "Unable to create event %s\n", | |
1314 | probe_desc->event_desc[i]->name); | |
1315 | } | |
1316 | } | |
1317 | } | |
1318 | } | |
1319 | ||
33a39a3c MD |
1320 | static |
1321 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1322 | { | |
1323 | int ret; | |
1324 | ||
1325 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1326 | WARN_ON_ONCE(ret); | |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | * Create struct lttng_event if it is missing and present in the list of | |
1331 | * tracepoint probes. | |
1332 | * Should be called with sessions mutex held. | |
1333 | */ | |
1334 | static | |
1335 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1336 | { | |
1337 | switch (enabler->event_param.instrumentation) { | |
1338 | case LTTNG_KERNEL_TRACEPOINT: | |
1339 | lttng_create_tracepoint_if_missing(enabler); | |
1340 | break; | |
1341 | case LTTNG_KERNEL_SYSCALL: | |
1342 | lttng_create_syscall_if_missing(enabler); | |
1343 | break; | |
1344 | default: | |
1345 | WARN_ON_ONCE(1); | |
1346 | break; | |
1347 | } | |
1348 | } | |
1349 | ||
3c997079 MD |
1350 | /* |
1351 | * Create events associated with an enabler (if not already present), | |
1352 | * and add backward reference from the event to the enabler. | |
1353 | * Should be called with sessions mutex held. | |
1354 | */ | |
1355 | static | |
1356 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1357 | { | |
1358 | struct lttng_session *session = enabler->chan->session; | |
1359 | struct lttng_event *event; | |
1360 | ||
1361 | /* First ensure that probe events are created for this enabler. */ | |
1362 | lttng_create_event_if_missing(enabler); | |
1363 | ||
1364 | /* For each event matching enabler in session event list. */ | |
1365 | list_for_each_entry(event, &session->events, list) { | |
1366 | struct lttng_enabler_ref *enabler_ref; | |
1367 | ||
1368 | if (!lttng_event_match_enabler(event, enabler)) | |
1369 | continue; | |
1370 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1371 | if (!enabler_ref) { | |
1372 | /* | |
1373 | * If no backward ref, create it. | |
1374 | * Add backward ref from event to enabler. | |
1375 | */ | |
1376 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1377 | if (!enabler_ref) | |
1378 | return -ENOMEM; | |
1379 | enabler_ref->ref = enabler; | |
1380 | list_add(&enabler_ref->node, | |
1381 | &event->enablers_ref_head); | |
1382 | } | |
1383 | ||
f127e61e MD |
1384 | /* |
1385 | * Link filter bytecodes if not linked yet. | |
1386 | */ | |
1387 | lttng_enabler_event_link_bytecode(event, enabler); | |
1388 | ||
3c997079 MD |
1389 | /* TODO: merge event context. */ |
1390 | } | |
1391 | return 0; | |
1392 | } | |
1393 | ||
1394 | /* | |
1395 | * Called at module load: connect the probe on all enablers matching | |
1396 | * this event. | |
1397 | * Called with sessions lock held. | |
1398 | */ | |
1399 | int lttng_fix_pending_events(void) | |
1400 | { | |
1401 | struct lttng_session *session; | |
1402 | ||
1403 | list_for_each_entry(session, &sessions, list) | |
1404 | lttng_session_lazy_sync_enablers(session); | |
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1409 | struct lttng_kernel_event *event_param, | |
1410 | struct lttng_channel *chan) | |
1411 | { | |
1412 | struct lttng_enabler *enabler; | |
1413 | ||
1414 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1415 | if (!enabler) | |
1416 | return NULL; | |
1417 | enabler->type = type; | |
07dfc1d0 | 1418 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1419 | memcpy(&enabler->event_param, event_param, |
1420 | sizeof(enabler->event_param)); | |
1421 | enabler->chan = chan; | |
1422 | /* ctx left NULL */ | |
4fd19d8a | 1423 | enabler->enabled = 0; |
3c997079 MD |
1424 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1425 | mutex_lock(&sessions_mutex); | |
1426 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1427 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1428 | mutex_unlock(&sessions_mutex); | |
1429 | return enabler; | |
1430 | } | |
1431 | ||
1432 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1433 | { | |
1434 | mutex_lock(&sessions_mutex); | |
1435 | enabler->enabled = 1; | |
1436 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1437 | mutex_unlock(&sessions_mutex); | |
1438 | return 0; | |
1439 | } | |
1440 | ||
1441 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1442 | { | |
1443 | mutex_lock(&sessions_mutex); | |
1444 | enabler->enabled = 0; | |
1445 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1446 | mutex_unlock(&sessions_mutex); | |
1447 | return 0; | |
1448 | } | |
1449 | ||
07dfc1d0 MD |
1450 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1451 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1452 | { | |
1453 | struct lttng_filter_bytecode_node *bytecode_node; | |
1454 | uint32_t bytecode_len; | |
1455 | int ret; | |
1456 | ||
1457 | ret = get_user(bytecode_len, &bytecode->len); | |
1458 | if (ret) | |
1459 | return ret; | |
1460 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1461 | GFP_KERNEL); | |
1462 | if (!bytecode_node) | |
1463 | return -ENOMEM; | |
1464 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1465 | sizeof(*bytecode) + bytecode_len); | |
1466 | if (ret) | |
1467 | goto error_free; | |
1468 | bytecode_node->enabler = enabler; | |
1469 | /* Enforce length based on allocated size */ | |
1470 | bytecode_node->bc.len = bytecode_len; | |
1471 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1472 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1473 | return 0; | |
1474 | ||
1475 | error_free: | |
1476 | kfree(bytecode_node); | |
1477 | return ret; | |
1478 | } | |
1479 | ||
3aed4dca FD |
1480 | int lttng_event_add_callsite(struct lttng_event *event, |
1481 | struct lttng_kernel_event_callsite __user *callsite) | |
1482 | { | |
1483 | ||
1484 | switch (event->instrumentation) { | |
1485 | case LTTNG_KERNEL_UPROBE: | |
1486 | return lttng_uprobes_add_callsite(event, callsite); | |
1487 | default: | |
1488 | return -EINVAL; | |
1489 | } | |
1490 | } | |
1491 | ||
3c997079 MD |
1492 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1493 | struct lttng_kernel_context *context_param) | |
1494 | { | |
1495 | return -ENOSYS; | |
1496 | } | |
1497 | ||
1498 | static | |
1499 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1500 | { | |
07dfc1d0 MD |
1501 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1502 | ||
1503 | /* Destroy filter bytecode */ | |
1504 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1505 | &enabler->filter_bytecode_head, node) { | |
1506 | kfree(filter_node); | |
1507 | } | |
1508 | ||
3c997079 MD |
1509 | /* Destroy contexts */ |
1510 | lttng_destroy_context(enabler->ctx); | |
1511 | ||
1512 | list_del(&enabler->node); | |
1513 | kfree(enabler); | |
1514 | } | |
1515 | ||
1516 | /* | |
1517 | * lttng_session_sync_enablers should be called just before starting a | |
1518 | * session. | |
1519 | * Should be called with sessions mutex held. | |
1520 | */ | |
1521 | static | |
1522 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1523 | { | |
1524 | struct lttng_enabler *enabler; | |
1525 | struct lttng_event *event; | |
1526 | ||
1527 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1528 | lttng_enabler_ref_events(enabler); | |
1529 | /* | |
1530 | * For each event, if at least one of its enablers is enabled, | |
1531 | * and its channel and session transient states are enabled, we | |
1532 | * enable the event, else we disable it. | |
1533 | */ | |
1534 | list_for_each_entry(event, &session->events, list) { | |
1535 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1536 | struct lttng_bytecode_runtime *runtime; |
1537 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1538 | |
4ecb5ad5 MD |
1539 | switch (event->instrumentation) { |
1540 | case LTTNG_KERNEL_TRACEPOINT: | |
1541 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1542 | /* Enable events */ |
1543 | list_for_each_entry(enabler_ref, | |
1544 | &event->enablers_ref_head, node) { | |
1545 | if (enabler_ref->ref->enabled) { | |
1546 | enabled = 1; | |
1547 | break; | |
1548 | } | |
1549 | } | |
4ecb5ad5 MD |
1550 | break; |
1551 | default: | |
3c997079 MD |
1552 | /* Not handled with lazy sync. */ |
1553 | continue; | |
1554 | } | |
1555 | /* | |
1556 | * Enabled state is based on union of enablers, with | |
1557 | * intesection of session and channel transient enable | |
1558 | * states. | |
1559 | */ | |
1560 | enabled = enabled && session->tstate && event->chan->tstate; | |
1561 | ||
a8f2d0c7 | 1562 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1563 | /* |
1564 | * Sync tracepoint registration with event enabled | |
1565 | * state. | |
1566 | */ | |
1567 | if (enabled) { | |
1568 | register_event(event); | |
1569 | } else { | |
1570 | _lttng_event_unregister(event); | |
1571 | } | |
07dfc1d0 MD |
1572 | |
1573 | /* Check if has enablers without bytecode enabled */ | |
1574 | list_for_each_entry(enabler_ref, | |
1575 | &event->enablers_ref_head, node) { | |
1576 | if (enabler_ref->ref->enabled | |
1577 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1578 | has_enablers_without_bytecode = 1; | |
1579 | break; | |
1580 | } | |
1581 | } | |
1582 | event->has_enablers_without_bytecode = | |
1583 | has_enablers_without_bytecode; | |
1584 | ||
1585 | /* Enable filters */ | |
1586 | list_for_each_entry(runtime, | |
f127e61e | 1587 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1588 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1589 | } |
1590 | } | |
1591 | ||
1592 | /* | |
1593 | * Apply enablers to session events, adding events to session if need | |
1594 | * be. It is required after each modification applied to an active | |
1595 | * session, and right before session "start". | |
1596 | * "lazy" sync means we only sync if required. | |
1597 | * Should be called with sessions mutex held. | |
1598 | */ | |
1599 | static | |
1600 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1601 | { | |
1602 | /* We can skip if session is not active */ | |
1603 | if (!session->active) | |
1604 | return; | |
1605 | lttng_session_sync_enablers(session); | |
1606 | } | |
1607 | ||
1ec3f75a | 1608 | /* |
d83004aa JD |
1609 | * Serialize at most one packet worth of metadata into a metadata |
1610 | * channel. | |
92d9f5e6 MD |
1611 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1612 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1613 | * allows us to do racy operations such as looking for remaining space left in | |
1614 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1615 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1616 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1617 | * Returns the number of bytes written in the channel, 0 if no data |
1618 | * was written and a negative value on error. | |
1ec3f75a | 1619 | */ |
b3b8072b MD |
1620 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1621 | struct channel *chan) | |
d83004aa JD |
1622 | { |
1623 | struct lib_ring_buffer_ctx ctx; | |
1624 | int ret = 0; | |
1625 | size_t len, reserve_len; | |
1626 | ||
f613e3e6 | 1627 | /* |
92d9f5e6 MD |
1628 | * Ensure we support mutiple get_next / put sequences followed by |
1629 | * put_next. The metadata cache lock protects reading the metadata | |
1630 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1631 | * "flush" operations on the buffer invoked by different processes. | |
1632 | * Moreover, since the metadata cache memory can be reallocated, we | |
1633 | * need to have exclusive access against updates even though we only | |
1634 | * read it. | |
f613e3e6 | 1635 | */ |
92d9f5e6 | 1636 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1637 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1638 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1639 | goto end; |
f613e3e6 | 1640 | |
9616f0bf JD |
1641 | /* Metadata regenerated, change the version. */ |
1642 | if (stream->metadata_cache->version != stream->version) | |
1643 | stream->version = stream->metadata_cache->version; | |
1644 | ||
d83004aa | 1645 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1646 | stream->metadata_in; |
9de2c215 | 1647 | if (!len) |
de23d59d | 1648 | goto end; |
d83004aa | 1649 | reserve_len = min_t(size_t, |
b3b8072b | 1650 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1651 | len); |
b3b8072b | 1652 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1653 | sizeof(char), -1); |
1654 | /* | |
1655 | * If reservation failed, return an error to the caller. | |
1656 | */ | |
b3b8072b | 1657 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1658 | if (ret != 0) { |
1659 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1660 | goto end; | |
1661 | } | |
b3b8072b | 1662 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1663 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1664 | reserve_len); |
b3b8072b | 1665 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1666 | stream->metadata_in += reserve_len; |
d83004aa JD |
1667 | ret = reserve_len; |
1668 | ||
1669 | end: | |
92d9f5e6 | 1670 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1671 | return ret; |
1672 | } | |
1673 | ||
1674 | /* | |
1675 | * Write the metadata to the metadata cache. | |
1676 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1677 | * The metadata cache lock protects us from concurrent read access from |
1678 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1679 | */ |
a90917c3 | 1680 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1681 | const char *fmt, ...) |
1682 | { | |
c099397a | 1683 | char *str; |
d83004aa | 1684 | size_t len; |
c099397a | 1685 | va_list ap; |
d83004aa | 1686 | struct lttng_metadata_stream *stream; |
c099397a | 1687 | |
a8f2d0c7 | 1688 | WARN_ON_ONCE(!READ_ONCE(session->active)); |
c099397a MD |
1689 | |
1690 | va_start(ap, fmt); | |
1691 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1692 | va_end(ap); | |
1693 | if (!str) | |
1694 | return -ENOMEM; | |
1695 | ||
1ec3f75a | 1696 | len = strlen(str); |
92d9f5e6 | 1697 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1698 | if (session->metadata_cache->metadata_written + len > |
1699 | session->metadata_cache->cache_alloc) { | |
1700 | char *tmp_cache_realloc; | |
1701 | unsigned int tmp_cache_alloc_size; | |
1702 | ||
1703 | tmp_cache_alloc_size = max_t(unsigned int, | |
1704 | session->metadata_cache->cache_alloc + len, | |
1705 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 1706 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1707 | if (!tmp_cache_realloc) |
1708 | goto err; | |
a606b6e8 ML |
1709 | if (session->metadata_cache->data) { |
1710 | memcpy(tmp_cache_realloc, | |
1711 | session->metadata_cache->data, | |
1712 | session->metadata_cache->cache_alloc); | |
1713 | vfree(session->metadata_cache->data); | |
1714 | } | |
1715 | ||
d83004aa JD |
1716 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1717 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1718 | } |
d83004aa JD |
1719 | memcpy(session->metadata_cache->data + |
1720 | session->metadata_cache->metadata_written, | |
1721 | str, len); | |
1722 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1723 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1724 | kfree(str); |
d83004aa JD |
1725 | |
1726 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1727 | wake_up_interruptible(&stream->read_wait); | |
1728 | ||
1729 | return 0; | |
1730 | ||
1731 | err: | |
92d9f5e6 | 1732 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1733 | kfree(str); |
1734 | return -ENOMEM; | |
c099397a MD |
1735 | } |
1736 | ||
f513b2bf MD |
1737 | static |
1738 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1739 | { | |
1740 | size_t i; | |
1741 | ||
1742 | for (i = 0; i < nesting; i++) { | |
1743 | int ret; | |
1744 | ||
1745 | ret = lttng_metadata_printf(session, " "); | |
1746 | if (ret) { | |
1747 | return ret; | |
1748 | } | |
1749 | } | |
1750 | return 0; | |
1751 | } | |
1752 | ||
ceabb767 MD |
1753 | static |
1754 | int lttng_field_name_statedump(struct lttng_session *session, | |
1755 | const struct lttng_event_field *field, | |
1756 | size_t nesting) | |
1757 | { | |
1758 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
1759 | } | |
1760 | ||
1761 | static | |
1762 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
1763 | const struct lttng_type *type, | |
1764 | size_t nesting) | |
1765 | { | |
1766 | int ret; | |
1767 | ||
1768 | WARN_ON_ONCE(type->atype != atype_integer); | |
1769 | ret = print_tabs(session, nesting); | |
1770 | if (ret) | |
1771 | return ret; | |
1772 | ret = lttng_metadata_printf(session, | |
1773 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
1774 | type->u.integer.size, | |
1775 | type->u.integer.alignment, | |
1776 | type->u.integer.signedness, | |
1777 | (type->u.integer.encoding == lttng_encode_none) | |
1778 | ? "none" | |
1779 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
1780 | ? "UTF8" | |
1781 | : "ASCII", | |
1782 | type->u.integer.base, | |
1783 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1784 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
1785 | #else | |
1786 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
1787 | #endif | |
1788 | ); | |
1789 | return ret; | |
1790 | } | |
1791 | ||
f513b2bf MD |
1792 | /* |
1793 | * Must be called with sessions_mutex held. | |
1794 | */ | |
1795 | static | |
1796 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1797 | const struct lttng_type *type, | |
1798 | size_t nesting) | |
1799 | { | |
1800 | int ret; | |
1801 | uint32_t i, nr_fields; | |
ceabb767 MD |
1802 | unsigned int alignment; |
1803 | ||
1804 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
1805 | |
1806 | ret = print_tabs(session, nesting); | |
1807 | if (ret) | |
1808 | return ret; | |
1809 | ret = lttng_metadata_printf(session, | |
1810 | "struct {\n"); | |
1811 | if (ret) | |
1812 | return ret; | |
ceabb767 | 1813 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
1814 | for (i = 0; i < nr_fields; i++) { |
1815 | const struct lttng_event_field *iter_field; | |
1816 | ||
ceabb767 | 1817 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
1818 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
1819 | if (ret) | |
1820 | return ret; | |
1821 | } | |
1822 | ret = print_tabs(session, nesting); | |
1823 | if (ret) | |
1824 | return ret; | |
ceabb767 MD |
1825 | alignment = type->u.struct_nestable.alignment; |
1826 | if (alignment) { | |
1827 | ret = lttng_metadata_printf(session, | |
1828 | "} align(%u)", | |
1829 | alignment); | |
1830 | } else { | |
1831 | ret = lttng_metadata_printf(session, | |
1832 | "}"); | |
1833 | } | |
f513b2bf MD |
1834 | return ret; |
1835 | } | |
1836 | ||
1837 | /* | |
1838 | * Must be called with sessions_mutex held. | |
1839 | */ | |
1840 | static | |
ceabb767 | 1841 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1842 | const struct lttng_event_field *field, |
1843 | size_t nesting) | |
1844 | { | |
1845 | int ret; | |
1846 | ||
1847 | ret = _lttng_struct_type_statedump(session, | |
1848 | &field->type, nesting); | |
1849 | if (ret) | |
1850 | return ret; | |
ceabb767 | 1851 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
1852 | } |
1853 | ||
65c85aa6 MD |
1854 | /* |
1855 | * Must be called with sessions_mutex held. | |
1856 | */ | |
1857 | static | |
1858 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1859 | const struct lttng_type *type, | |
1860 | size_t nesting) | |
1861 | { | |
1862 | int ret; | |
1863 | uint32_t i, nr_choices; | |
1864 | ||
ceabb767 MD |
1865 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
1866 | /* | |
1867 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
1868 | */ | |
1869 | if (type->u.variant_nestable.alignment != 0) | |
1870 | return -EINVAL; | |
65c85aa6 MD |
1871 | ret = print_tabs(session, nesting); |
1872 | if (ret) | |
1873 | return ret; | |
1874 | ret = lttng_metadata_printf(session, | |
1875 | "variant <_%s> {\n", | |
ceabb767 | 1876 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
1877 | if (ret) |
1878 | return ret; | |
ceabb767 | 1879 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
1880 | for (i = 0; i < nr_choices; i++) { |
1881 | const struct lttng_event_field *iter_field; | |
1882 | ||
ceabb767 | 1883 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
1884 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
1885 | if (ret) | |
1886 | return ret; | |
1887 | } | |
1888 | ret = print_tabs(session, nesting); | |
1889 | if (ret) | |
1890 | return ret; | |
1891 | ret = lttng_metadata_printf(session, | |
1892 | "}"); | |
1893 | return ret; | |
1894 | } | |
1895 | ||
1896 | /* | |
1897 | * Must be called with sessions_mutex held. | |
1898 | */ | |
1899 | static | |
ceabb767 | 1900 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
1901 | const struct lttng_event_field *field, |
1902 | size_t nesting) | |
1903 | { | |
1904 | int ret; | |
1905 | ||
1906 | ret = _lttng_variant_type_statedump(session, | |
1907 | &field->type, nesting); | |
1908 | if (ret) | |
1909 | return ret; | |
ceabb767 | 1910 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
1911 | } |
1912 | ||
f513b2bf MD |
1913 | /* |
1914 | * Must be called with sessions_mutex held. | |
1915 | */ | |
1916 | static | |
ceabb767 | 1917 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1918 | const struct lttng_event_field *field, |
1919 | size_t nesting) | |
1920 | { | |
1921 | int ret; | |
1922 | const struct lttng_type *elem_type; | |
1923 | ||
ceabb767 MD |
1924 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
1925 | ||
1926 | if (field->type.u.array_nestable.alignment) { | |
1927 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
1928 | if (ret) |
1929 | return ret; | |
ceabb767 MD |
1930 | ret = lttng_metadata_printf(session, |
1931 | "struct { } align(%u) _%s_padding;\n", | |
1932 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
1933 | field->name); | |
1934 | if (ret) | |
1935 | return ret; | |
1936 | } | |
1937 | /* | |
1938 | * Nested compound types: Only array of structures and variants are | |
1939 | * currently supported. | |
1940 | */ | |
1941 | elem_type = field->type.u.array_nestable.elem_type; | |
1942 | switch (elem_type->atype) { | |
1943 | case atype_integer: | |
1944 | case atype_struct_nestable: | |
1945 | case atype_variant_nestable: | |
1946 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
1947 | if (ret) |
1948 | return ret; | |
1949 | break; | |
ceabb767 | 1950 | |
f513b2bf MD |
1951 | default: |
1952 | return -EINVAL; | |
1953 | } | |
1954 | ret = lttng_metadata_printf(session, | |
1955 | " _%s[%u];\n", | |
1956 | field->name, | |
ceabb767 | 1957 | field->type.u.array_nestable.length); |
f513b2bf MD |
1958 | return ret; |
1959 | } | |
1960 | ||
1961 | /* | |
1962 | * Must be called with sessions_mutex held. | |
1963 | */ | |
1964 | static | |
ceabb767 | 1965 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1966 | const struct lttng_event_field *field, |
1967 | size_t nesting) | |
1968 | { | |
1969 | int ret; | |
1970 | const char *length_name; | |
1971 | const struct lttng_type *elem_type; | |
1972 | ||
ceabb767 | 1973 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 1974 | |
ceabb767 MD |
1975 | length_name = field->type.u.sequence_nestable.length_name; |
1976 | ||
1977 | if (field->type.u.sequence_nestable.alignment) { | |
1978 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
1979 | if (ret) |
1980 | return ret; | |
ceabb767 MD |
1981 | ret = lttng_metadata_printf(session, |
1982 | "struct { } align(%u) _%s_padding;\n", | |
1983 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
1984 | field->name); | |
1985 | if (ret) | |
1986 | return ret; | |
1987 | } | |
1988 | ||
1989 | /* | |
1990 | * Nested compound types: Only array of structures and variants are | |
1991 | * currently supported. | |
1992 | */ | |
1993 | elem_type = field->type.u.sequence_nestable.elem_type; | |
1994 | switch (elem_type->atype) { | |
1995 | case atype_integer: | |
1996 | case atype_struct_nestable: | |
1997 | case atype_variant_nestable: | |
1998 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
1999 | if (ret) |
2000 | return ret; | |
2001 | break; | |
ceabb767 | 2002 | |
f513b2bf MD |
2003 | default: |
2004 | return -EINVAL; | |
2005 | } | |
2006 | ret = lttng_metadata_printf(session, | |
2007 | " _%s[ _%s ];\n", | |
2008 | field->name, | |
ceabb767 | 2009 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
2010 | return ret; |
2011 | } | |
2012 | ||
141ddf28 MD |
2013 | /* |
2014 | * Must be called with sessions_mutex held. | |
2015 | */ | |
2016 | static | |
ceabb767 MD |
2017 | int _lttng_enum_type_statedump(struct lttng_session *session, |
2018 | const struct lttng_type *type, | |
141ddf28 MD |
2019 | size_t nesting) |
2020 | { | |
2021 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 2022 | const struct lttng_type *container_type; |
141ddf28 MD |
2023 | int ret; |
2024 | unsigned int i, nr_entries; | |
2025 | ||
ceabb767 MD |
2026 | container_type = type->u.enum_nestable.container_type; |
2027 | if (container_type->atype != atype_integer) { | |
2028 | ret = -EINVAL; | |
2029 | goto end; | |
2030 | } | |
2031 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
2032 | nr_entries = enum_desc->nr_entries; |
2033 | ||
2034 | ret = print_tabs(session, nesting); | |
2035 | if (ret) | |
2036 | goto end; | |
ceabb767 MD |
2037 | ret = lttng_metadata_printf(session, "enum : "); |
2038 | if (ret) | |
2039 | goto end; | |
2040 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 2041 | if (ret) |
ceabb767 MD |
2042 | goto end; |
2043 | ret = lttng_metadata_printf(session, " {\n"); | |
2044 | if (ret) | |
2045 | goto end; | |
141ddf28 MD |
2046 | /* Dump all entries */ |
2047 | for (i = 0; i < nr_entries; i++) { | |
2048 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2049 | int j, len; | |
2050 | ||
2051 | ret = print_tabs(session, nesting + 1); | |
2052 | if (ret) | |
2053 | goto end; | |
2054 | ret = lttng_metadata_printf(session, | |
2055 | "\""); | |
2056 | if (ret) | |
2057 | goto end; | |
2058 | len = strlen(entry->string); | |
2059 | /* Escape the character '"' */ | |
2060 | for (j = 0; j < len; j++) { | |
2061 | char c = entry->string[j]; | |
2062 | ||
2063 | switch (c) { | |
2064 | case '"': | |
2065 | ret = lttng_metadata_printf(session, | |
2066 | "\\\""); | |
2067 | break; | |
2068 | case '\\': | |
2069 | ret = lttng_metadata_printf(session, | |
2070 | "\\\\"); | |
2071 | break; | |
2072 | default: | |
2073 | ret = lttng_metadata_printf(session, | |
2074 | "%c", c); | |
2075 | break; | |
2076 | } | |
2077 | if (ret) | |
2078 | goto end; | |
2079 | } | |
08ad1061 PP |
2080 | ret = lttng_metadata_printf(session, "\""); |
2081 | if (ret) | |
2082 | goto end; | |
2083 | ||
2084 | if (entry->options.is_auto) { | |
2085 | ret = lttng_metadata_printf(session, ",\n"); | |
2086 | if (ret) | |
2087 | goto end; | |
141ddf28 | 2088 | } else { |
7c559490 MD |
2089 | ret = lttng_metadata_printf(session, |
2090 | " = "); | |
2091 | if (ret) | |
2092 | goto end; | |
2093 | if (entry->start.signedness) | |
141ddf28 | 2094 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2095 | "%lld", (long long) entry->start.value); |
2096 | else | |
2097 | ret = lttng_metadata_printf(session, | |
2098 | "%llu", entry->start.value); | |
2099 | if (ret) | |
2100 | goto end; | |
2101 | if (entry->start.signedness == entry->end.signedness && | |
2102 | entry->start.value | |
2103 | == entry->end.value) { | |
141ddf28 | 2104 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2105 | ",\n"); |
2106 | } else { | |
2107 | if (entry->end.signedness) { | |
2108 | ret = lttng_metadata_printf(session, | |
2109 | " ... %lld,\n", | |
2110 | (long long) entry->end.value); | |
2111 | } else { | |
2112 | ret = lttng_metadata_printf(session, | |
2113 | " ... %llu,\n", | |
2114 | entry->end.value); | |
2115 | } | |
141ddf28 | 2116 | } |
7c559490 MD |
2117 | if (ret) |
2118 | goto end; | |
141ddf28 | 2119 | } |
141ddf28 MD |
2120 | } |
2121 | ret = print_tabs(session, nesting); | |
2122 | if (ret) | |
2123 | goto end; | |
ceabb767 | 2124 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
2125 | end: |
2126 | return ret; | |
2127 | } | |
2128 | ||
d83004aa JD |
2129 | /* |
2130 | * Must be called with sessions_mutex held. | |
2131 | */ | |
c099397a | 2132 | static |
ceabb767 MD |
2133 | int _lttng_enum_field_statedump(struct lttng_session *session, |
2134 | const struct lttng_event_field *field, | |
2135 | size_t nesting) | |
2136 | { | |
2137 | int ret; | |
2138 | ||
2139 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
2140 | if (ret) | |
2141 | return ret; | |
2142 | return lttng_field_name_statedump(session, field, nesting); | |
2143 | } | |
2144 | ||
2145 | static | |
2146 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
2147 | const struct lttng_event_field *field, | |
2148 | size_t nesting) | |
2149 | { | |
2150 | int ret; | |
2151 | ||
2152 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
2153 | if (ret) | |
2154 | return ret; | |
2155 | return lttng_field_name_statedump(session, field, nesting); | |
2156 | } | |
2157 | ||
2158 | static | |
2159 | int _lttng_string_type_statedump(struct lttng_session *session, | |
2160 | const struct lttng_type *type, | |
2161 | size_t nesting) | |
2162 | { | |
2163 | int ret; | |
2164 | ||
2165 | WARN_ON_ONCE(type->atype != atype_string); | |
2166 | /* Default encoding is UTF8 */ | |
2167 | ret = print_tabs(session, nesting); | |
2168 | if (ret) | |
2169 | return ret; | |
2170 | ret = lttng_metadata_printf(session, | |
2171 | "string%s", | |
2172 | type->u.string.encoding == lttng_encode_ASCII ? | |
2173 | " { encoding = ASCII; }" : ""); | |
2174 | return ret; | |
2175 | } | |
2176 | ||
2177 | static | |
2178 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
2179 | const struct lttng_event_field *field, |
2180 | size_t nesting) | |
ceabb767 MD |
2181 | { |
2182 | int ret; | |
2183 | ||
2184 | WARN_ON_ONCE(field->type.atype != atype_string); | |
2185 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
2186 | if (ret) | |
2187 | return ret; | |
2188 | return lttng_field_name_statedump(session, field, nesting); | |
2189 | } | |
2190 | ||
2191 | /* | |
2192 | * Must be called with sessions_mutex held. | |
2193 | */ | |
2194 | static | |
2195 | int _lttng_type_statedump(struct lttng_session *session, | |
2196 | const struct lttng_type *type, | |
2197 | size_t nesting) | |
c099397a | 2198 | { |
c099397a | 2199 | int ret = 0; |
c099397a | 2200 | |
ceabb767 | 2201 | switch (type->atype) { |
8070f5c0 | 2202 | case atype_integer: |
ceabb767 | 2203 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 2204 | break; |
ceabb767 MD |
2205 | case atype_enum_nestable: |
2206 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 2207 | break; |
ceabb767 MD |
2208 | case atype_string: |
2209 | ret = _lttng_string_type_statedump(session, type, nesting); | |
2210 | break; | |
2211 | case atype_struct_nestable: | |
2212 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 2213 | break; |
ceabb767 MD |
2214 | case atype_variant_nestable: |
2215 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
2216 | break; | |
2217 | ||
2218 | /* Nested arrays and sequences are not supported yet. */ | |
2219 | case atype_array_nestable: | |
2220 | case atype_sequence_nestable: | |
2221 | default: | |
2222 | WARN_ON_ONCE(1); | |
2223 | return -EINVAL; | |
8070f5c0 | 2224 | } |
ceabb767 MD |
2225 | return ret; |
2226 | } | |
8070f5c0 | 2227 | |
ceabb767 MD |
2228 | /* |
2229 | * Must be called with sessions_mutex held. | |
2230 | */ | |
2231 | static | |
2232 | int _lttng_field_statedump(struct lttng_session *session, | |
2233 | const struct lttng_event_field *field, | |
2234 | size_t nesting) | |
2235 | { | |
2236 | int ret = 0; | |
27d2368e | 2237 | |
ceabb767 MD |
2238 | switch (field->type.atype) { |
2239 | case atype_integer: | |
2240 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
2241 | break; | |
2242 | case atype_enum_nestable: | |
2243 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 2244 | break; |
8070f5c0 | 2245 | case atype_string: |
ceabb767 | 2246 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 2247 | break; |
ceabb767 MD |
2248 | case atype_struct_nestable: |
2249 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 2250 | break; |
ceabb767 MD |
2251 | case atype_array_nestable: |
2252 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 2253 | break; |
ceabb767 MD |
2254 | case atype_sequence_nestable: |
2255 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 2256 | break; |
ceabb767 MD |
2257 | case atype_variant_nestable: |
2258 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 2259 | break; |
f513b2bf | 2260 | |
8070f5c0 MD |
2261 | default: |
2262 | WARN_ON_ONCE(1); | |
2263 | return -EINVAL; | |
2264 | } | |
2265 | return ret; | |
2266 | } | |
2267 | ||
2268 | static | |
a90917c3 | 2269 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2270 | struct lttng_ctx *ctx) |
2271 | { | |
2272 | int ret = 0; | |
2273 | int i; | |
2274 | ||
2275 | if (!ctx) | |
2276 | return 0; | |
2277 | for (i = 0; i < ctx->nr_fields; i++) { | |
2278 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2279 | ||
f513b2bf | 2280 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2281 | if (ret) |
2282 | return ret; | |
2283 | } | |
2284 | return ret; | |
2285 | } | |
2286 | ||
2287 | static | |
a90917c3 MD |
2288 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2289 | struct lttng_event *event) | |
8070f5c0 MD |
2290 | { |
2291 | const struct lttng_event_desc *desc = event->desc; | |
2292 | int ret = 0; | |
2293 | int i; | |
2294 | ||
2295 | for (i = 0; i < desc->nr_fields; i++) { | |
2296 | const struct lttng_event_field *field = &desc->fields[i]; | |
2297 | ||
f513b2bf | 2298 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2299 | if (ret) |
2300 | return ret; | |
c099397a MD |
2301 | } |
2302 | return ret; | |
2303 | } | |
2304 | ||
d83004aa JD |
2305 | /* |
2306 | * Must be called with sessions_mutex held. | |
2307 | */ | |
c099397a | 2308 | static |
a90917c3 MD |
2309 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2310 | struct lttng_channel *chan, | |
2311 | struct lttng_event *event) | |
c099397a MD |
2312 | { |
2313 | int ret = 0; | |
2314 | ||
a8f2d0c7 | 2315 | if (event->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2316 | return 0; |
d83004aa | 2317 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2318 | return 0; |
2319 | ||
2320 | ret = lttng_metadata_printf(session, | |
2321 | "event {\n" | |
ae734547 | 2322 | " name = \"%s\";\n" |
c099397a | 2323 | " id = %u;\n" |
b9074a1b | 2324 | " stream_id = %u;\n", |
c099397a MD |
2325 | event->desc->name, |
2326 | event->id, | |
2327 | event->chan->id); | |
2328 | if (ret) | |
2329 | goto end; | |
2330 | ||
b9074a1b MD |
2331 | if (event->ctx) { |
2332 | ret = lttng_metadata_printf(session, | |
2333 | " context := struct {\n"); | |
2334 | if (ret) | |
2335 | goto end; | |
2336 | } | |
a90917c3 | 2337 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2338 | if (ret) |
2339 | goto end; | |
b9074a1b MD |
2340 | if (event->ctx) { |
2341 | ret = lttng_metadata_printf(session, | |
2342 | " };\n"); | |
2343 | if (ret) | |
2344 | goto end; | |
2345 | } | |
8070f5c0 MD |
2346 | |
2347 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2348 | " fields := struct {\n" |
2349 | ); | |
2350 | if (ret) | |
2351 | goto end; | |
2352 | ||
a90917c3 | 2353 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2354 | if (ret) |
2355 | goto end; | |
2356 | ||
2357 | /* | |
2358 | * LTTng space reservation can only reserve multiples of the | |
2359 | * byte size. | |
2360 | */ | |
2361 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2362 | " };\n" |
2363 | "};\n\n"); | |
c099397a MD |
2364 | if (ret) |
2365 | goto end; | |
2366 | ||
c099397a MD |
2367 | event->metadata_dumped = 1; |
2368 | end: | |
2369 | return ret; | |
2370 | ||
2371 | } | |
2372 | ||
d83004aa JD |
2373 | /* |
2374 | * Must be called with sessions_mutex held. | |
2375 | */ | |
c099397a | 2376 | static |
a90917c3 MD |
2377 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2378 | struct lttng_channel *chan) | |
c099397a MD |
2379 | { |
2380 | int ret = 0; | |
2381 | ||
a8f2d0c7 | 2382 | if (chan->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2383 | return 0; |
d83004aa JD |
2384 | |
2385 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2386 | return 0; |
2387 | ||
2388 | WARN_ON_ONCE(!chan->header_type); | |
2389 | ret = lttng_metadata_printf(session, | |
2390 | "stream {\n" | |
2391 | " id = %u;\n" | |
9115fbdc | 2392 | " event.header := %s;\n" |
b9074a1b | 2393 | " packet.context := struct packet_context;\n", |
c099397a MD |
2394 | chan->id, |
2395 | chan->header_type == 1 ? "struct event_header_compact" : | |
2396 | "struct event_header_large"); | |
2397 | if (ret) | |
2398 | goto end; | |
2399 | ||
b9074a1b MD |
2400 | if (chan->ctx) { |
2401 | ret = lttng_metadata_printf(session, | |
2402 | " event.context := struct {\n"); | |
2403 | if (ret) | |
2404 | goto end; | |
2405 | } | |
a90917c3 | 2406 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2407 | if (ret) |
2408 | goto end; | |
b9074a1b MD |
2409 | if (chan->ctx) { |
2410 | ret = lttng_metadata_printf(session, | |
2411 | " };\n"); | |
2412 | if (ret) | |
2413 | goto end; | |
2414 | } | |
8070f5c0 MD |
2415 | |
2416 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2417 | "};\n\n"); |
8070f5c0 | 2418 | |
c099397a MD |
2419 | chan->metadata_dumped = 1; |
2420 | end: | |
2421 | return ret; | |
2422 | } | |
2423 | ||
d83004aa JD |
2424 | /* |
2425 | * Must be called with sessions_mutex held. | |
2426 | */ | |
9115fbdc | 2427 | static |
a90917c3 | 2428 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2429 | { |
2430 | return lttng_metadata_printf(session, | |
2431 | "struct packet_context {\n" | |
a3ccff4f MD |
2432 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2433 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2434 | " uint64_t content_size;\n" |
2435 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2436 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2437 | " unsigned long events_discarded;\n" |
9115fbdc | 2438 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2439 | "};\n\n" |
9115fbdc MD |
2440 | ); |
2441 | } | |
2442 | ||
2443 | /* | |
2444 | * Compact header: | |
2445 | * id: range: 0 - 30. | |
2446 | * id 31 is reserved to indicate an extended header. | |
2447 | * | |
2448 | * Large header: | |
2449 | * id: range: 0 - 65534. | |
2450 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2451 | * |
2452 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2453 | */ |
2454 | static | |
a90917c3 | 2455 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2456 | { |
2457 | return lttng_metadata_printf(session, | |
2458 | "struct event_header_compact {\n" | |
2459 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2460 | " variant <id> {\n" | |
2461 | " struct {\n" | |
a3ccff4f | 2462 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2463 | " } compact;\n" |
2464 | " struct {\n" | |
2465 | " uint32_t id;\n" | |
a3ccff4f | 2466 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2467 | " } extended;\n" |
2468 | " } v;\n" | |
2469 | "} align(%u);\n" | |
2470 | "\n" | |
2471 | "struct event_header_large {\n" | |
2472 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2473 | " variant <id> {\n" | |
2474 | " struct {\n" | |
a3ccff4f | 2475 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2476 | " } compact;\n" |
2477 | " struct {\n" | |
2478 | " uint32_t id;\n" | |
a3ccff4f | 2479 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2480 | " } extended;\n" |
2481 | " } v;\n" | |
2482 | "} align(%u);\n\n", | |
a90917c3 MD |
2483 | lttng_alignof(uint32_t) * CHAR_BIT, |
2484 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2485 | ); |
2486 | } | |
2487 | ||
a3ccff4f MD |
2488 | /* |
2489 | * Approximation of NTP time of day to clock monotonic correlation, | |
2490 | * taken at start of trace. | |
2491 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2492 | * in future versions. | |
5283350b MD |
2493 | * This function may return a negative offset. It may happen if the |
2494 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
2495 | * |
2496 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
2497 | * y2038 compliant. | |
a3ccff4f MD |
2498 | */ |
2499 | static | |
8967b2a3 | 2500 | int64_t measure_clock_offset(void) |
a3ccff4f | 2501 | { |
dcb93448 | 2502 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2503 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2504 | int64_t offset; |
a3ccff4f | 2505 | unsigned long flags; |
3636085f | 2506 | struct timespec64 rts = { 0, 0 }; |
a3ccff4f MD |
2507 | |
2508 | /* Disable interrupts to increase correlation precision. */ | |
2509 | local_irq_save(flags); | |
2510 | monotonic[0] = trace_clock_read64(); | |
3636085f | 2511 | ktime_get_real_ts64(&rts); |
a3ccff4f MD |
2512 | monotonic[1] = trace_clock_read64(); |
2513 | local_irq_restore(flags); | |
2514 | ||
dcb93448 | 2515 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2516 | realtime = (uint64_t) rts.tv_sec * tcf; |
2517 | if (tcf == NSEC_PER_SEC) { | |
2518 | realtime += rts.tv_nsec; | |
2519 | } else { | |
2520 | uint64_t n = rts.tv_nsec * tcf; | |
2521 | ||
2522 | do_div(n, NSEC_PER_SEC); | |
2523 | realtime += n; | |
2524 | } | |
dcb93448 | 2525 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2526 | return offset; |
2527 | } | |
2528 | ||
3eb95be4 JR |
2529 | static |
2530 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
2531 | { | |
0f3eaad4 | 2532 | int ret = 0; |
3eb95be4 JR |
2533 | size_t i; |
2534 | char cur; | |
2535 | ||
2536 | i = 0; | |
2537 | cur = string[i]; | |
2538 | while (cur != '\0') { | |
2539 | switch (cur) { | |
2540 | case '\n': | |
2541 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
2542 | break; | |
2543 | case '\\': | |
2544 | case '"': | |
2545 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
2546 | if (ret) | |
2547 | goto error; | |
2548 | /* We still print the current char */ | |
2549 | /* Fallthrough */ | |
2550 | default: | |
2551 | ret = lttng_metadata_printf(session, "%c", cur); | |
2552 | break; | |
2553 | } | |
2554 | ||
2555 | if (ret) | |
2556 | goto error; | |
2557 | ||
2558 | cur = string[++i]; | |
2559 | } | |
2560 | error: | |
2561 | return ret; | |
2562 | } | |
2563 | ||
2564 | static | |
1c88f269 JR |
2565 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
2566 | const char *field_value) | |
3eb95be4 JR |
2567 | { |
2568 | int ret; | |
2569 | ||
1c88f269 | 2570 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
2571 | if (ret) |
2572 | goto error; | |
2573 | ||
1c88f269 | 2574 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
2575 | if (ret) |
2576 | goto error; | |
2577 | ||
2578 | ret = lttng_metadata_printf(session, "\";\n"); | |
2579 | ||
2580 | error: | |
2581 | return ret; | |
2582 | } | |
2583 | ||
c099397a MD |
2584 | /* |
2585 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2586 | * Must be called with sessions_mutex held. |
c099397a MD |
2587 | */ |
2588 | static | |
a90917c3 | 2589 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2590 | { |
30bdb6e4 | 2591 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2592 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 2593 | const char *product_uuid; |
a90917c3 MD |
2594 | struct lttng_channel *chan; |
2595 | struct lttng_event *event; | |
c099397a MD |
2596 | int ret = 0; |
2597 | ||
a8f2d0c7 | 2598 | if (!READ_ONCE(session->active)) |
c099397a MD |
2599 | return 0; |
2600 | if (session->metadata_dumped) | |
2601 | goto skip_session; | |
c099397a | 2602 | |
d793d5e1 | 2603 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2604 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2605 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2606 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2607 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2608 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2609 | |
2610 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2611 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2612 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2613 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2614 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2615 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2616 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2617 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2618 | "\n" |
2619 | "trace {\n" | |
2620 | " major = %u;\n" | |
2621 | " minor = %u;\n" | |
30bdb6e4 | 2622 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2623 | " byte_order = %s;\n" |
2624 | " packet.header := struct {\n" | |
2625 | " uint32_t magic;\n" | |
1ec3f75a | 2626 | " uint8_t uuid[16];\n" |
d793d5e1 | 2627 | " uint32_t stream_id;\n" |
5594698f | 2628 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2629 | " };\n" |
d793d5e1 | 2630 | "};\n\n", |
a90917c3 MD |
2631 | lttng_alignof(uint8_t) * CHAR_BIT, |
2632 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2633 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2634 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2635 | sizeof(unsigned long) * CHAR_BIT, |
2636 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2637 | CTF_SPEC_MAJOR, |
2638 | CTF_SPEC_MINOR, | |
d793d5e1 | 2639 | uuid_s, |
5214fa50 | 2640 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2641 | "be" |
2642 | #else | |
2643 | "le" | |
2644 | #endif | |
2645 | ); | |
2646 | if (ret) | |
2647 | goto end; | |
2648 | ||
99dc9597 MD |
2649 | ret = lttng_metadata_printf(session, |
2650 | "env {\n" | |
a6058143 | 2651 | " hostname = \"%s\";\n" |
c6c9e10f | 2652 | " domain = \"kernel\";\n" |
99dc9597 | 2653 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2654 | " kernel_release = \"%s\";\n" |
2655 | " kernel_version = \"%s\";\n" | |
2656 | " tracer_name = \"lttng-modules\";\n" | |
2657 | " tracer_major = %d;\n" | |
2658 | " tracer_minor = %d;\n" | |
2659 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 2660 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 2661 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2662 | utsname()->sysname, |
2663 | utsname()->release, | |
c6c9e10f MD |
2664 | utsname()->version, |
2665 | LTTNG_MODULES_MAJOR_VERSION, | |
2666 | LTTNG_MODULES_MINOR_VERSION, | |
2667 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2668 | ); |
2669 | if (ret) | |
2670 | goto end; | |
2671 | ||
1c88f269 JR |
2672 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
2673 | if (ret) | |
2674 | goto end; | |
2675 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
2676 | session->creation_time); | |
3eb95be4 JR |
2677 | if (ret) |
2678 | goto end; | |
2679 | ||
c88f762e GB |
2680 | /* Add the product UUID to the 'env' section */ |
2681 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
2682 | if (product_uuid) { | |
2683 | ret = lttng_metadata_printf(session, | |
2684 | " product_uuid = \"%s\";\n", | |
2685 | product_uuid | |
2686 | ); | |
2687 | if (ret) | |
2688 | goto end; | |
2689 | } | |
2690 | ||
2691 | /* Close the 'env' section */ | |
3eb95be4 JR |
2692 | ret = lttng_metadata_printf(session, "};\n\n"); |
2693 | if (ret) | |
2694 | goto end; | |
2695 | ||
a3ccff4f MD |
2696 | ret = lttng_metadata_printf(session, |
2697 | "clock {\n" | |
2754583e MD |
2698 | " name = \"%s\";\n", |
2699 | trace_clock_name() | |
a82c63f1 MD |
2700 | ); |
2701 | if (ret) | |
2702 | goto end; | |
2703 | ||
2704 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2705 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2706 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2707 | clock_uuid_s |
2708 | ); | |
2709 | if (ret) | |
2710 | goto end; | |
2711 | } | |
2712 | ||
2713 | ret = lttng_metadata_printf(session, | |
2754583e | 2714 | " description = \"%s\";\n" |
a3ccff4f MD |
2715 | " freq = %llu; /* Frequency, in Hz */\n" |
2716 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2717 | " offset = %lld;\n" |
a3ccff4f | 2718 | "};\n\n", |
2754583e | 2719 | trace_clock_description(), |
a3ccff4f | 2720 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2721 | (long long) measure_clock_offset() |
a3ccff4f MD |
2722 | ); |
2723 | if (ret) | |
2724 | goto end; | |
2725 | ||
2726 | ret = lttng_metadata_printf(session, | |
2727 | "typealias integer {\n" | |
2728 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2729 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2730 | "} := uint27_clock_monotonic_t;\n" |
2731 | "\n" | |
2732 | "typealias integer {\n" | |
2733 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2734 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2735 | "} := uint32_clock_monotonic_t;\n" |
2736 | "\n" | |
2737 | "typealias integer {\n" | |
2738 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2739 | " map = clock.%s.value;\n" |
a3ccff4f | 2740 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2741 | trace_clock_name(), |
a3ccff4f | 2742 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2743 | trace_clock_name(), |
2744 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2745 | trace_clock_name() | |
a3ccff4f MD |
2746 | ); |
2747 | if (ret) | |
2748 | goto end; | |
2749 | ||
a90917c3 | 2750 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2751 | if (ret) |
2752 | goto end; | |
2753 | ||
a90917c3 | 2754 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2755 | if (ret) |
2756 | goto end; | |
2757 | ||
c099397a MD |
2758 | skip_session: |
2759 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2760 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2761 | if (ret) |
2762 | goto end; | |
2763 | } | |
2764 | ||
2765 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2766 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2767 | if (ret) |
2768 | goto end; | |
2769 | } | |
2770 | session->metadata_dumped = 1; | |
2771 | end: | |
2772 | return ret; | |
2773 | } | |
2774 | ||
c0e31d2e | 2775 | /** |
a90917c3 | 2776 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2777 | * @transport: transport structure |
2778 | * | |
2779 | * Registers a transport which can be used as output to extract the data out of | |
c50bdba2 | 2780 | * LTTng. |
c0e31d2e | 2781 | */ |
a90917c3 | 2782 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e | 2783 | { |
c0e31d2e | 2784 | mutex_lock(&sessions_mutex); |
a90917c3 | 2785 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2786 | mutex_unlock(&sessions_mutex); |
2787 | } | |
a90917c3 | 2788 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2789 | |
2790 | /** | |
a90917c3 | 2791 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2792 | * @transport: transport structure |
2793 | */ | |
a90917c3 | 2794 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2795 | { |
2796 | mutex_lock(&sessions_mutex); | |
2797 | list_del(&transport->node); | |
2798 | mutex_unlock(&sessions_mutex); | |
2799 | } | |
a90917c3 | 2800 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2801 | |
894ce5dc | 2802 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2803 | |
2804 | enum cpuhp_state lttng_hp_prepare; | |
2805 | enum cpuhp_state lttng_hp_online; | |
2806 | ||
2807 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2808 | { | |
2809 | struct lttng_cpuhp_node *lttng_node; | |
2810 | ||
2811 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2812 | switch (lttng_node->component) { | |
2813 | case LTTNG_RING_BUFFER_FRONTEND: | |
2814 | return 0; | |
2815 | case LTTNG_RING_BUFFER_BACKEND: | |
2816 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2817 | case LTTNG_RING_BUFFER_ITER: | |
2818 | return 0; | |
2819 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2820 | return 0; | |
2821 | default: | |
2822 | return -EINVAL; | |
2823 | } | |
2824 | } | |
2825 | ||
2826 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2827 | { | |
2828 | struct lttng_cpuhp_node *lttng_node; | |
2829 | ||
2830 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2831 | switch (lttng_node->component) { | |
2832 | case LTTNG_RING_BUFFER_FRONTEND: | |
2833 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2834 | case LTTNG_RING_BUFFER_BACKEND: | |
2835 | return 0; | |
2836 | case LTTNG_RING_BUFFER_ITER: | |
2837 | return 0; | |
2838 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2839 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2840 | default: | |
2841 | return -EINVAL; | |
2842 | } | |
2843 | } | |
2844 | ||
2845 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2846 | { | |
2847 | struct lttng_cpuhp_node *lttng_node; | |
2848 | ||
2849 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2850 | switch (lttng_node->component) { | |
2851 | case LTTNG_RING_BUFFER_FRONTEND: | |
2852 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2853 | case LTTNG_RING_BUFFER_BACKEND: | |
2854 | return 0; | |
2855 | case LTTNG_RING_BUFFER_ITER: | |
2856 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2857 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2858 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2859 | default: | |
2860 | return -EINVAL; | |
2861 | } | |
2862 | } | |
2863 | ||
2864 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2865 | { | |
2866 | struct lttng_cpuhp_node *lttng_node; | |
2867 | ||
2868 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2869 | switch (lttng_node->component) { | |
2870 | case LTTNG_RING_BUFFER_FRONTEND: | |
2871 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2872 | case LTTNG_RING_BUFFER_BACKEND: | |
2873 | return 0; | |
2874 | case LTTNG_RING_BUFFER_ITER: | |
2875 | return 0; | |
2876 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2877 | return 0; | |
2878 | default: | |
2879 | return -EINVAL; | |
2880 | } | |
2881 | } | |
2882 | ||
2883 | static int __init lttng_init_cpu_hotplug(void) | |
2884 | { | |
2885 | int ret; | |
2886 | ||
2887 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2888 | lttng_hotplug_prepare, | |
2889 | lttng_hotplug_dead); | |
2890 | if (ret < 0) { | |
2891 | return ret; | |
2892 | } | |
2893 | lttng_hp_prepare = ret; | |
2894 | lttng_rb_set_hp_prepare(ret); | |
2895 | ||
2896 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2897 | lttng_hotplug_online, | |
2898 | lttng_hotplug_offline); | |
2899 | if (ret < 0) { | |
2900 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2901 | lttng_hp_prepare = 0; | |
2902 | return ret; | |
2903 | } | |
2904 | lttng_hp_online = ret; | |
2905 | lttng_rb_set_hp_online(ret); | |
2906 | ||
2907 | return 0; | |
2908 | } | |
2909 | ||
2910 | static void __exit lttng_exit_cpu_hotplug(void) | |
2911 | { | |
2912 | lttng_rb_set_hp_online(0); | |
2913 | cpuhp_remove_multi_state(lttng_hp_online); | |
2914 | lttng_rb_set_hp_prepare(0); | |
2915 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2916 | } | |
2917 | ||
1ee63d8d | 2918 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2919 | static int lttng_init_cpu_hotplug(void) |
2920 | { | |
2921 | return 0; | |
2922 | } | |
2923 | static void lttng_exit_cpu_hotplug(void) | |
2924 | { | |
2925 | } | |
1ee63d8d | 2926 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2927 | |
2928 | ||
a90917c3 | 2929 | static int __init lttng_events_init(void) |
4e3c1b9b | 2930 | { |
1c25284c MD |
2931 | int ret; |
2932 | ||
114667d5 | 2933 | ret = lttng_probes_init(); |
389d7070 MD |
2934 | if (ret) |
2935 | return ret; | |
07dfc1d0 | 2936 | ret = lttng_context_init(); |
20591cf7 MD |
2937 | if (ret) |
2938 | return ret; | |
07dfc1d0 MD |
2939 | ret = lttng_tracepoint_init(); |
2940 | if (ret) | |
2941 | goto error_tp; | |
a90917c3 | 2942 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2943 | if (!event_cache) { |
2944 | ret = -ENOMEM; | |
2945 | goto error_kmem; | |
2946 | } | |
80996790 | 2947 | ret = lttng_abi_init(); |
02119ee5 MD |
2948 | if (ret) |
2949 | goto error_abi; | |
0c956676 MD |
2950 | ret = lttng_logger_init(); |
2951 | if (ret) | |
2952 | goto error_logger; | |
1e367326 MD |
2953 | ret = lttng_init_cpu_hotplug(); |
2954 | if (ret) | |
2955 | goto error_hotplug; | |
101215b7 | 2956 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2957 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2958 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2959 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2960 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2961 | LTTNG_VERSION_NAME, |
2962 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2963 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2964 | #else | |
2965 | "", | |
2966 | #endif | |
2967 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2968 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2969 | #else | |
2970 | ""); | |
2971 | #endif | |
4e3c1b9b | 2972 | return 0; |
0c956676 | 2973 | |
1e367326 MD |
2974 | error_hotplug: |
2975 | lttng_logger_exit(); | |
0c956676 MD |
2976 | error_logger: |
2977 | lttng_abi_exit(); | |
02119ee5 | 2978 | error_abi: |
1c25284c | 2979 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2980 | error_kmem: |
2981 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2982 | error_tp: |
2983 | lttng_context_exit(); | |
101215b7 | 2984 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2985 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2986 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2987 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2988 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2989 | LTTNG_VERSION_NAME, |
2990 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2991 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2992 | #else | |
2993 | "", | |
2994 | #endif | |
2995 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2996 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2997 | #else | |
2998 | ""); | |
2999 | #endif | |
1c25284c | 3000 | return ret; |
4e3c1b9b MD |
3001 | } |
3002 | ||
a90917c3 | 3003 | module_init(lttng_events_init); |
11b5a3c2 | 3004 | |
a90917c3 | 3005 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 3006 | { |
a90917c3 | 3007 | struct lttng_session *session, *tmpsession; |
92e94819 | 3008 | |
1e367326 | 3009 | lttng_exit_cpu_hotplug(); |
0c956676 | 3010 | lttng_logger_exit(); |
80996790 | 3011 | lttng_abi_exit(); |
92e94819 | 3012 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 3013 | lttng_session_destroy(session); |
11b5a3c2 | 3014 | kmem_cache_destroy(event_cache); |
20591cf7 | 3015 | lttng_tracepoint_exit(); |
07dfc1d0 | 3016 | lttng_context_exit(); |
101215b7 | 3017 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3018 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3019 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3020 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3021 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3022 | LTTNG_VERSION_NAME, |
3023 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3024 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3025 | #else | |
3026 | "", | |
3027 | #endif | |
3028 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3029 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3030 | #else | |
3031 | ""); | |
3032 | #endif | |
4e3c1b9b | 3033 | } |
92e94819 | 3034 | |
a90917c3 | 3035 | module_exit(lttng_events_exit); |
11b5a3c2 | 3036 | |
101215b7 MJ |
3037 | #include "extra_version/patches.i" |
3038 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3039 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3040 | #endif | |
3041 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3042 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3043 | #endif | |
92e94819 MD |
3044 | MODULE_LICENSE("GPL and additional rights"); |
3045 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3046 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3047 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3048 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3049 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3050 | LTTNG_MODULES_EXTRAVERSION); |