Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
3c997079 | 27 | #include <linux/jhash.h> |
8c6e7f13 | 28 | #include <linux/uaccess.h> |
41f229dc | 29 | #include <linux/uuid.h> |
c88f762e | 30 | #include <linux/dmi.h> |
c50bdba2 | 31 | #include <linux/vmalloc.h> |
3c997079 | 32 | |
241ae9a8 | 33 | #include <wrapper/random.h> |
241ae9a8 | 34 | #include <wrapper/list.h> |
cbc19040 | 35 | #include <wrapper/types.h> |
241ae9a8 MD |
36 | #include <lttng-kernel-version.h> |
37 | #include <lttng-events.h> | |
38 | #include <lttng-tracer.h> | |
39 | #include <lttng-abi-old.h> | |
5214fa50 | 40 | #include <lttng-endian.h> |
4993071a | 41 | #include <lttng-string-utils.h> |
0d260d3d | 42 | #include <lttng-tracepoint.h> |
64af2437 MD |
43 | #include <wrapper/ringbuffer/backend.h> |
44 | #include <wrapper/ringbuffer/frontend.h> | |
4e3c1b9b | 45 | |
d83004aa JD |
46 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
47 | ||
4e3c1b9b | 48 | static LIST_HEAD(sessions); |
a90917c3 | 49 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
50 | /* |
51 | * Protect the sessions and metadata caches. | |
52 | */ | |
4e3c1b9b MD |
53 | static DEFINE_MUTEX(sessions_mutex); |
54 | static struct kmem_cache *event_cache; | |
55 | ||
3c997079 MD |
56 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
57 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
58 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
59 | ||
a90917c3 MD |
60 | static void _lttng_event_destroy(struct lttng_event *event); |
61 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
62 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 63 | static |
a90917c3 MD |
64 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
65 | struct lttng_channel *chan, | |
66 | struct lttng_event *event); | |
c099397a | 67 | static |
a90917c3 | 68 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
69 | static |
70 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 71 | static |
ceabb767 MD |
72 | int _lttng_type_statedump(struct lttng_session *session, |
73 | const struct lttng_type *type, | |
74 | size_t nesting); | |
75 | static | |
f513b2bf MD |
76 | int _lttng_field_statedump(struct lttng_session *session, |
77 | const struct lttng_event_field *field, | |
78 | size_t nesting); | |
c099397a | 79 | |
c099397a | 80 | void synchronize_trace(void) |
abcca994 | 81 | { |
92da05ce MJ |
82 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
83 | synchronize_rcu(); | |
84 | #else | |
abcca994 | 85 | synchronize_sched(); |
92da05ce MJ |
86 | #endif |
87 | ||
b8590f40 MD |
88 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
89 | #ifdef CONFIG_PREEMPT_RT_FULL | |
90 | synchronize_rcu(); | |
91 | #endif | |
92 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
93 | #ifdef CONFIG_PREEMPT_RT |
94 | synchronize_rcu(); | |
95 | #endif | |
b8590f40 | 96 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
97 | } |
98 | ||
3c997079 MD |
99 | void lttng_lock_sessions(void) |
100 | { | |
101 | mutex_lock(&sessions_mutex); | |
102 | } | |
103 | ||
104 | void lttng_unlock_sessions(void) | |
105 | { | |
106 | mutex_unlock(&sessions_mutex); | |
107 | } | |
108 | ||
109 | /* | |
110 | * Called with sessions lock held. | |
111 | */ | |
112 | int lttng_session_active(void) | |
113 | { | |
114 | struct lttng_session *iter; | |
115 | ||
116 | list_for_each_entry(iter, &sessions, list) { | |
117 | if (iter->active) | |
118 | return 1; | |
119 | } | |
120 | return 0; | |
121 | } | |
122 | ||
a90917c3 | 123 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 124 | { |
a90917c3 | 125 | struct lttng_session *session; |
d83004aa | 126 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 127 | int i; |
4e3c1b9b MD |
128 | |
129 | mutex_lock(&sessions_mutex); | |
c50bdba2 MD |
130 | session = kvzalloc_node(sizeof(struct lttng_session), GFP_KERNEL, |
131 | NUMA_NO_NODE); | |
4e3c1b9b | 132 | if (!session) |
d83004aa | 133 | goto err; |
4e3c1b9b | 134 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 135 | INIT_LIST_HEAD(&session->events); |
496a7e97 | 136 | guid_gen(&session->uuid); |
d83004aa JD |
137 | |
138 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
139 | GFP_KERNEL); | |
140 | if (!metadata_cache) | |
141 | goto err_free_session; | |
0ca42eb7 | 142 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
143 | if (!metadata_cache->data) |
144 | goto err_free_cache; | |
145 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
146 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 147 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
148 | session->metadata_cache = metadata_cache; |
149 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
150 | memcpy(&metadata_cache->uuid, &session->uuid, |
151 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
152 | INIT_LIST_HEAD(&session->enablers_head); |
153 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
154 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 155 | list_add(&session->list, &sessions); |
d1f652f8 MD |
156 | session->pid_tracker.session = session; |
157 | session->pid_tracker.tracker_type = TRACKER_PID; | |
158 | session->vpid_tracker.session = session; | |
159 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
160 | session->uid_tracker.session = session; | |
161 | session->uid_tracker.tracker_type = TRACKER_UID; | |
162 | session->vuid_tracker.session = session; | |
163 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
164 | session->gid_tracker.session = session; | |
165 | session->gid_tracker.tracker_type = TRACKER_GID; | |
166 | session->vgid_tracker.session = session; | |
167 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
168 | mutex_unlock(&sessions_mutex); |
169 | return session; | |
d83004aa JD |
170 | |
171 | err_free_cache: | |
172 | kfree(metadata_cache); | |
173 | err_free_session: | |
c50bdba2 | 174 | kvfree(session); |
d83004aa JD |
175 | err: |
176 | mutex_unlock(&sessions_mutex); | |
177 | return NULL; | |
178 | } | |
179 | ||
180 | void metadata_cache_destroy(struct kref *kref) | |
181 | { | |
182 | struct lttng_metadata_cache *cache = | |
183 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 184 | vfree(cache->data); |
d83004aa | 185 | kfree(cache); |
4e3c1b9b MD |
186 | } |
187 | ||
a90917c3 | 188 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 189 | { |
a90917c3 MD |
190 | struct lttng_channel *chan, *tmpchan; |
191 | struct lttng_event *event, *tmpevent; | |
d83004aa | 192 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 193 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 194 | int ret; |
4e3c1b9b MD |
195 | |
196 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 197 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
198 | list_for_each_entry(chan, &session->chan, list) { |
199 | ret = lttng_syscalls_unregister(chan); | |
200 | WARN_ON(ret); | |
201 | } | |
dda6a249 | 202 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 203 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
204 | WARN_ON(ret); |
205 | } | |
abcca994 | 206 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
207 | list_for_each_entry_safe(enabler, tmpenabler, |
208 | &session->enablers_head, node) | |
209 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 210 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 211 | _lttng_event_destroy(event); |
d83004aa JD |
212 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
213 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 214 | _lttng_channel_destroy(chan); |
d83004aa JD |
215 | } |
216 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
217 | _lttng_metadata_channel_hangup(metadata_stream); | |
d1f652f8 MD |
218 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
219 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
220 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
221 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
222 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
223 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 224 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
225 | list_del(&session->list); |
226 | mutex_unlock(&sessions_mutex); | |
c50bdba2 | 227 | kvfree(session); |
4e3c1b9b MD |
228 | } |
229 | ||
601252cf MD |
230 | int lttng_session_statedump(struct lttng_session *session) |
231 | { | |
232 | int ret; | |
233 | ||
234 | mutex_lock(&sessions_mutex); | |
235 | ret = lttng_statedump_start(session); | |
236 | mutex_unlock(&sessions_mutex); | |
237 | return ret; | |
238 | } | |
239 | ||
a90917c3 | 240 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
241 | { |
242 | int ret = 0; | |
a90917c3 | 243 | struct lttng_channel *chan; |
c0e31d2e MD |
244 | |
245 | mutex_lock(&sessions_mutex); | |
246 | if (session->active) { | |
247 | ret = -EBUSY; | |
248 | goto end; | |
249 | } | |
c099397a | 250 | |
3c997079 MD |
251 | /* Set transient enabler state to "enabled" */ |
252 | session->tstate = 1; | |
253 | ||
4ef81e4a MD |
254 | /* We need to sync enablers with session before activation. */ |
255 | lttng_session_sync_enablers(session); | |
256 | ||
c099397a MD |
257 | /* |
258 | * Snapshot the number of events per channel to know the type of header | |
259 | * we need to use. | |
260 | */ | |
261 | list_for_each_entry(chan, &session->chan, list) { | |
262 | if (chan->header_type) | |
263 | continue; /* don't change it if session stop/restart */ | |
264 | if (chan->free_event_id < 31) | |
265 | chan->header_type = 1; /* compact */ | |
266 | else | |
267 | chan->header_type = 2; /* large */ | |
268 | } | |
269 | ||
64af2437 | 270 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
271 | list_for_each_entry(chan, &session->chan, list) { |
272 | if (chan->channel_type != METADATA_CHANNEL) | |
273 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
274 | } | |
64af2437 | 275 | |
a8f2d0c7 MJ |
276 | WRITE_ONCE(session->active, 1); |
277 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 278 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 279 | if (ret) { |
a8f2d0c7 | 280 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
281 | goto end; |
282 | } | |
283 | ret = lttng_statedump_start(session); | |
360f38ea | 284 | if (ret) |
a8f2d0c7 | 285 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
286 | end: |
287 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 288 | return ret; |
c0e31d2e MD |
289 | } |
290 | ||
a90917c3 | 291 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
292 | { |
293 | int ret = 0; | |
64af2437 | 294 | struct lttng_channel *chan; |
c0e31d2e MD |
295 | |
296 | mutex_lock(&sessions_mutex); | |
297 | if (!session->active) { | |
298 | ret = -EBUSY; | |
299 | goto end; | |
300 | } | |
a8f2d0c7 | 301 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
302 | |
303 | /* Set transient enabler state to "disabled" */ | |
304 | session->tstate = 0; | |
305 | lttng_session_sync_enablers(session); | |
64af2437 MD |
306 | |
307 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
308 | list_for_each_entry(chan, &session->chan, list) { |
309 | if (chan->channel_type != METADATA_CHANNEL) | |
310 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
311 | } | |
c0e31d2e MD |
312 | end: |
313 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 314 | return ret; |
c0e31d2e MD |
315 | } |
316 | ||
9616f0bf JD |
317 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
318 | { | |
319 | int ret = 0; | |
320 | struct lttng_channel *chan; | |
321 | struct lttng_event *event; | |
322 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
323 | struct lttng_metadata_stream *stream; | |
324 | ||
325 | mutex_lock(&sessions_mutex); | |
326 | if (!session->active) { | |
327 | ret = -EBUSY; | |
328 | goto end; | |
329 | } | |
330 | ||
331 | mutex_lock(&cache->lock); | |
332 | memset(cache->data, 0, cache->cache_alloc); | |
333 | cache->metadata_written = 0; | |
334 | cache->version++; | |
335 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
336 | stream->metadata_out = 0; | |
337 | stream->metadata_in = 0; | |
338 | } | |
339 | mutex_unlock(&cache->lock); | |
340 | ||
341 | session->metadata_dumped = 0; | |
342 | list_for_each_entry(chan, &session->chan, list) { | |
343 | chan->metadata_dumped = 0; | |
344 | } | |
345 | ||
346 | list_for_each_entry(event, &session->events, list) { | |
347 | event->metadata_dumped = 0; | |
348 | } | |
349 | ||
350 | ret = _lttng_session_metadata_statedump(session); | |
351 | ||
352 | end: | |
353 | mutex_unlock(&sessions_mutex); | |
354 | return ret; | |
355 | } | |
356 | ||
a90917c3 | 357 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 358 | { |
3c997079 | 359 | int ret = 0; |
e64957da | 360 | |
3c997079 MD |
361 | mutex_lock(&sessions_mutex); |
362 | if (channel->channel_type == METADATA_CHANNEL) { | |
363 | ret = -EPERM; | |
364 | goto end; | |
365 | } | |
366 | if (channel->enabled) { | |
367 | ret = -EEXIST; | |
368 | goto end; | |
369 | } | |
370 | /* Set transient enabler state to "enabled" */ | |
371 | channel->tstate = 1; | |
372 | lttng_session_sync_enablers(channel->session); | |
373 | /* Set atomically the state to "enabled" */ | |
a8f2d0c7 | 374 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
375 | end: |
376 | mutex_unlock(&sessions_mutex); | |
377 | return ret; | |
e64957da MD |
378 | } |
379 | ||
a90917c3 | 380 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 381 | { |
3c997079 | 382 | int ret = 0; |
e64957da | 383 | |
3c997079 MD |
384 | mutex_lock(&sessions_mutex); |
385 | if (channel->channel_type == METADATA_CHANNEL) { | |
386 | ret = -EPERM; | |
387 | goto end; | |
388 | } | |
389 | if (!channel->enabled) { | |
390 | ret = -EEXIST; | |
391 | goto end; | |
392 | } | |
393 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 394 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
395 | /* Set transient enabler state to "enabled" */ |
396 | channel->tstate = 0; | |
397 | lttng_session_sync_enablers(channel->session); | |
398 | end: | |
399 | mutex_unlock(&sessions_mutex); | |
400 | return ret; | |
e64957da MD |
401 | } |
402 | ||
a90917c3 | 403 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 404 | { |
3c997079 | 405 | int ret = 0; |
e64957da | 406 | |
3c997079 MD |
407 | mutex_lock(&sessions_mutex); |
408 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
409 | ret = -EPERM; | |
410 | goto end; | |
411 | } | |
412 | if (event->enabled) { | |
413 | ret = -EEXIST; | |
414 | goto end; | |
415 | } | |
a0493bef MD |
416 | switch (event->instrumentation) { |
417 | case LTTNG_KERNEL_TRACEPOINT: | |
418 | case LTTNG_KERNEL_SYSCALL: | |
419 | ret = -EINVAL; | |
420 | break; | |
421 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 422 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 423 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 424 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
425 | break; |
426 | case LTTNG_KERNEL_KRETPROBE: | |
427 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
428 | break; | |
e884017c | 429 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
430 | default: |
431 | WARN_ON_ONCE(1); | |
432 | ret = -EINVAL; | |
433 | } | |
3c997079 MD |
434 | end: |
435 | mutex_unlock(&sessions_mutex); | |
436 | return ret; | |
e64957da MD |
437 | } |
438 | ||
a90917c3 | 439 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 440 | { |
3c997079 | 441 | int ret = 0; |
e64957da | 442 | |
3c997079 MD |
443 | mutex_lock(&sessions_mutex); |
444 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
445 | ret = -EPERM; | |
446 | goto end; | |
447 | } | |
448 | if (!event->enabled) { | |
449 | ret = -EEXIST; | |
450 | goto end; | |
451 | } | |
a0493bef MD |
452 | switch (event->instrumentation) { |
453 | case LTTNG_KERNEL_TRACEPOINT: | |
454 | case LTTNG_KERNEL_SYSCALL: | |
455 | ret = -EINVAL; | |
456 | break; | |
457 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 458 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 459 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 460 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
461 | break; |
462 | case LTTNG_KERNEL_KRETPROBE: | |
463 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
464 | break; | |
e884017c | 465 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
466 | default: |
467 | WARN_ON_ONCE(1); | |
468 | ret = -EINVAL; | |
469 | } | |
3c997079 MD |
470 | end: |
471 | mutex_unlock(&sessions_mutex); | |
472 | return ret; | |
e64957da MD |
473 | } |
474 | ||
a90917c3 | 475 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 476 | { |
a90917c3 | 477 | struct lttng_transport *transport; |
f3d01b96 | 478 | |
a90917c3 | 479 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
480 | if (!strcmp(transport->name, name)) |
481 | return transport; | |
482 | } | |
483 | return NULL; | |
484 | } | |
485 | ||
a90917c3 | 486 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
487 | const char *transport_name, |
488 | void *buf_addr, | |
4e3c1b9b MD |
489 | size_t subbuf_size, size_t num_subbuf, |
490 | unsigned int switch_timer_interval, | |
d83004aa JD |
491 | unsigned int read_timer_interval, |
492 | enum channel_type channel_type) | |
4e3c1b9b | 493 | { |
a90917c3 MD |
494 | struct lttng_channel *chan; |
495 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
496 | |
497 | mutex_lock(&sessions_mutex); | |
d83004aa | 498 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 499 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 500 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
501 | if (!transport) { |
502 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
503 | transport_name); | |
c0e31d2e | 504 | goto notransport; |
f3d01b96 | 505 | } |
a33c9927 MD |
506 | if (!try_module_get(transport->owner)) { |
507 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
508 | goto notransport; | |
509 | } | |
a90917c3 | 510 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 511 | if (!chan) |
c0e31d2e | 512 | goto nomem; |
4e3c1b9b | 513 | chan->session = session; |
05d32c64 | 514 | chan->id = session->free_chan_id++; |
3b731ab1 | 515 | chan->ops = &transport->ops; |
125b4df4 MD |
516 | /* |
517 | * Note: the channel creation op already writes into the packet | |
518 | * headers. Therefore the "chan" information used as input | |
519 | * should be already accessible. | |
520 | */ | |
5f5ddf01 MD |
521 | chan->chan = transport->ops.channel_create(transport_name, |
522 | chan, buf_addr, subbuf_size, num_subbuf, | |
523 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
524 | if (!chan->chan) |
525 | goto create_error; | |
3c997079 | 526 | chan->tstate = 1; |
e64957da | 527 | chan->enabled = 1; |
a33c9927 | 528 | chan->transport = transport; |
d83004aa | 529 | chan->channel_type = channel_type; |
4e3c1b9b MD |
530 | list_add(&chan->list, &session->chan); |
531 | mutex_unlock(&sessions_mutex); | |
532 | return chan; | |
533 | ||
f3d01b96 MD |
534 | create_error: |
535 | kfree(chan); | |
c0e31d2e | 536 | nomem: |
a33c9927 MD |
537 | if (transport) |
538 | module_put(transport->owner); | |
c0e31d2e | 539 | notransport: |
e5382b6d | 540 | active: |
4e3c1b9b MD |
541 | mutex_unlock(&sessions_mutex); |
542 | return NULL; | |
543 | } | |
544 | ||
545 | /* | |
d83004aa JD |
546 | * Only used internally at session destruction for per-cpu channels, and |
547 | * when metadata channel is released. | |
548 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 549 | */ |
aa7c23a9 | 550 | static |
a90917c3 | 551 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 552 | { |
11b5a3c2 | 553 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 554 | module_put(chan->transport->owner); |
4e3c1b9b | 555 | list_del(&chan->list); |
8070f5c0 | 556 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
557 | kfree(chan); |
558 | } | |
559 | ||
d83004aa JD |
560 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
561 | { | |
562 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
563 | ||
564 | /* Protect the metadata cache with the sessions_mutex. */ | |
565 | mutex_lock(&sessions_mutex); | |
566 | _lttng_channel_destroy(chan); | |
567 | mutex_unlock(&sessions_mutex); | |
568 | } | |
569 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
570 | ||
571 | static | |
572 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
573 | { | |
574 | stream->finalized = 1; | |
575 | wake_up_interruptible(&stream->read_wait); | |
576 | } | |
577 | ||
e5382b6d MD |
578 | /* |
579 | * Supports event creation while tracing session is active. | |
3c997079 | 580 | * Needs to be called with sessions mutex held. |
e5382b6d | 581 | */ |
3c997079 MD |
582 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
583 | struct lttng_kernel_event *event_param, | |
584 | void *filter, | |
585 | const struct lttng_event_desc *event_desc, | |
586 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 587 | { |
3c997079 | 588 | struct lttng_session *session = chan->session; |
a90917c3 | 589 | struct lttng_event *event; |
3c997079 MD |
590 | const char *event_name; |
591 | struct hlist_head *head; | |
592 | size_t name_len; | |
593 | uint32_t hash; | |
3d084699 | 594 | int ret; |
4e3c1b9b | 595 | |
abc0446a | 596 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 597 | ret = -EMFILE; |
e5382b6d | 598 | goto full; |
abc0446a | 599 | } |
3c997079 MD |
600 | |
601 | switch (itype) { | |
602 | case LTTNG_KERNEL_TRACEPOINT: | |
603 | event_name = event_desc->name; | |
604 | break; | |
605 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 606 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 607 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 608 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 609 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
610 | event_name = event_param->name; |
611 | break; | |
e884017c | 612 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
613 | default: |
614 | WARN_ON_ONCE(1); | |
615 | ret = -EINVAL; | |
616 | goto type_error; | |
617 | } | |
618 | name_len = strlen(event_name); | |
619 | hash = jhash(event_name, name_len, 0); | |
620 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 621 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
622 | WARN_ON_ONCE(!event->desc); |
623 | if (!strncmp(event->desc->name, event_name, | |
624 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
625 | && chan == event->chan) { | |
626 | ret = -EEXIST; | |
627 | goto exist; | |
abc0446a MD |
628 | } |
629 | } | |
3c997079 | 630 | |
11b5a3c2 | 631 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 632 | if (!event) { |
4cf0bf51 | 633 | ret = -ENOMEM; |
4e3c1b9b | 634 | goto cache_error; |
abc0446a | 635 | } |
4e3c1b9b MD |
636 | event->chan = chan; |
637 | event->filter = filter; | |
e5382b6d | 638 | event->id = chan->free_event_id++; |
3c997079 MD |
639 | event->instrumentation = itype; |
640 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 641 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
642 | INIT_LIST_HEAD(&event->enablers_ref_head); |
643 | ||
644 | switch (itype) { | |
ab2277d6 | 645 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
646 | /* Event will be enabled by enabler sync. */ |
647 | event->enabled = 0; | |
648 | event->registered = 0; | |
649 | event->desc = lttng_event_get(event_name); | |
abc0446a | 650 | if (!event->desc) { |
4cf0bf51 | 651 | ret = -ENOENT; |
d3dbe23c | 652 | goto register_error; |
abc0446a | 653 | } |
3c997079 MD |
654 | /* Populate lttng_event structure before event registration. */ |
655 | smp_wmb(); | |
baf20995 | 656 | break; |
ab2277d6 | 657 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
658 | /* |
659 | * Needs to be explicitly enabled after creation, since | |
660 | * we may want to apply filters. | |
661 | */ | |
662 | event->enabled = 0; | |
3c997079 MD |
663 | event->registered = 1; |
664 | /* | |
665 | * Populate lttng_event structure before event | |
666 | * registration. | |
667 | */ | |
668 | smp_wmb(); | |
669 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
670 | event_param->u.kprobe.symbol_name, |
671 | event_param->u.kprobe.offset, | |
672 | event_param->u.kprobe.addr, | |
673 | event); | |
abc0446a | 674 | if (ret) { |
4cf0bf51 | 675 | ret = -EINVAL; |
d6d808f3 | 676 | goto register_error; |
abc0446a | 677 | } |
edeb3137 MD |
678 | ret = try_module_get(event->desc->owner); |
679 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 680 | break; |
7371f44c MD |
681 | case LTTNG_KERNEL_KRETPROBE: |
682 | { | |
a90917c3 | 683 | struct lttng_event *event_return; |
7371f44c MD |
684 | |
685 | /* kretprobe defines 2 events */ | |
a0493bef MD |
686 | /* |
687 | * Needs to be explicitly enabled after creation, since | |
688 | * we may want to apply filters. | |
689 | */ | |
690 | event->enabled = 0; | |
3c997079 | 691 | event->registered = 1; |
7371f44c MD |
692 | event_return = |
693 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 694 | if (!event_return) { |
4cf0bf51 | 695 | ret = -ENOMEM; |
7371f44c | 696 | goto register_error; |
abc0446a | 697 | } |
7371f44c MD |
698 | event_return->chan = chan; |
699 | event_return->filter = filter; | |
700 | event_return->id = chan->free_event_id++; | |
a0493bef | 701 | event_return->enabled = 0; |
3c997079 MD |
702 | event_return->registered = 1; |
703 | event_return->instrumentation = itype; | |
7371f44c | 704 | /* |
a90917c3 | 705 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
706 | */ |
707 | smp_wmb(); | |
3c997079 | 708 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
709 | event_param->u.kretprobe.symbol_name, |
710 | event_param->u.kretprobe.offset, | |
711 | event_param->u.kretprobe.addr, | |
712 | event, event_return); | |
713 | if (ret) { | |
714 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 715 | ret = -EINVAL; |
7371f44c MD |
716 | goto register_error; |
717 | } | |
718 | /* Take 2 refs on the module: one per event. */ | |
719 | ret = try_module_get(event->desc->owner); | |
720 | WARN_ON_ONCE(!ret); | |
721 | ret = try_module_get(event->desc->owner); | |
722 | WARN_ON_ONCE(!ret); | |
a90917c3 | 723 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 724 | event_return); |
abc0446a | 725 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
726 | if (ret) { |
727 | kmem_cache_free(event_cache, event_return); | |
728 | module_put(event->desc->owner); | |
729 | module_put(event->desc->owner); | |
730 | goto statedump_error; | |
731 | } | |
732 | list_add(&event_return->list, &chan->session->events); | |
733 | break; | |
734 | } | |
1ec65de1 | 735 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 736 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
737 | /* |
738 | * Needs to be explicitly enabled after creation, since | |
739 | * we may want to apply filters. | |
740 | */ | |
741 | event->enabled = 0; | |
3c997079 MD |
742 | event->registered = 0; |
743 | event->desc = event_desc; | |
abc0446a | 744 | if (!event->desc) { |
4cf0bf51 | 745 | ret = -EINVAL; |
259b6cb3 | 746 | goto register_error; |
abc0446a | 747 | } |
1ec65de1 | 748 | break; |
149b9a9d | 749 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
750 | /* |
751 | * Needs to be explicitly enabled after creation, since | |
752 | * we may want to apply filters. | |
753 | */ | |
754 | event->enabled = 0; | |
755 | event->registered = 1; | |
3aed4dca | 756 | |
a344f64b FD |
757 | /* |
758 | * Populate lttng_event structure before event | |
759 | * registration. | |
760 | */ | |
761 | smp_wmb(); | |
149b9a9d YB |
762 | |
763 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 764 | event_param->u.uprobe.fd, |
149b9a9d YB |
765 | event); |
766 | if (ret) | |
767 | goto register_error; | |
768 | ret = try_module_get(event->desc->owner); | |
769 | WARN_ON_ONCE(!ret); | |
770 | break; | |
e884017c | 771 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
772 | default: |
773 | WARN_ON_ONCE(1); | |
4cf0bf51 | 774 | ret = -EINVAL; |
df07930b | 775 | goto register_error; |
baf20995 | 776 | } |
a90917c3 | 777 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
778 | WARN_ON_ONCE(ret > 0); |
779 | if (ret) { | |
c099397a | 780 | goto statedump_error; |
abc0446a | 781 | } |
3c997079 | 782 | hlist_add_head(&event->hlist, head); |
dda6a249 | 783 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
784 | return event; |
785 | ||
c099397a | 786 | statedump_error: |
259b6cb3 | 787 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 788 | register_error: |
11b5a3c2 | 789 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
790 | cache_error: |
791 | exist: | |
3c997079 | 792 | type_error: |
e5382b6d | 793 | full: |
4cf0bf51 | 794 | return ERR_PTR(ret); |
4e3c1b9b MD |
795 | } |
796 | ||
3c997079 MD |
797 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
798 | struct lttng_kernel_event *event_param, | |
799 | void *filter, | |
800 | const struct lttng_event_desc *event_desc, | |
801 | enum lttng_kernel_instrumentation itype) | |
802 | { | |
803 | struct lttng_event *event; | |
804 | ||
805 | mutex_lock(&sessions_mutex); | |
806 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
807 | itype); | |
808 | mutex_unlock(&sessions_mutex); | |
809 | return event; | |
810 | } | |
811 | ||
812 | /* Only used for tracepoints for now. */ | |
813 | static | |
814 | void register_event(struct lttng_event *event) | |
815 | { | |
816 | const struct lttng_event_desc *desc; | |
f127e61e | 817 | int ret = -EINVAL; |
3c997079 | 818 | |
3c997079 MD |
819 | if (event->registered) |
820 | return; | |
4ecb5ad5 | 821 | |
3c997079 | 822 | desc = event->desc; |
4ecb5ad5 MD |
823 | switch (event->instrumentation) { |
824 | case LTTNG_KERNEL_TRACEPOINT: | |
0d260d3d MD |
825 | ret = lttng_tracepoint_probe_register(desc->kname, |
826 | desc->probe_callback, | |
827 | event); | |
4ecb5ad5 MD |
828 | break; |
829 | case LTTNG_KERNEL_SYSCALL: | |
830 | ret = lttng_syscall_filter_enable(event->chan, | |
831 | desc->name); | |
832 | break; | |
833 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 834 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 835 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
836 | case LTTNG_KERNEL_NOOP: |
837 | ret = 0; | |
838 | break; | |
e884017c | 839 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
840 | default: |
841 | WARN_ON_ONCE(1); | |
842 | } | |
3c997079 MD |
843 | if (!ret) |
844 | event->registered = 1; | |
845 | } | |
846 | ||
4e3c1b9b MD |
847 | /* |
848 | * Only used internally at session destruction. | |
849 | */ | |
a90917c3 | 850 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 851 | { |
4ecb5ad5 | 852 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
853 | int ret = -EINVAL; |
854 | ||
3c997079 MD |
855 | if (!event->registered) |
856 | return 0; | |
857 | ||
4ecb5ad5 | 858 | desc = event->desc; |
38d024ae | 859 | switch (event->instrumentation) { |
ab2277d6 | 860 | case LTTNG_KERNEL_TRACEPOINT: |
0d260d3d | 861 | ret = lttng_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 862 | event->desc->probe_callback, |
11b5a3c2 | 863 | event); |
baf20995 | 864 | break; |
ab2277d6 | 865 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 866 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
867 | ret = 0; |
868 | break; | |
7371f44c MD |
869 | case LTTNG_KERNEL_KRETPROBE: |
870 | lttng_kretprobes_unregister(event); | |
871 | ret = 0; | |
872 | break; | |
33a39a3c | 873 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
874 | ret = lttng_syscall_filter_disable(event->chan, |
875 | desc->name); | |
876 | break; | |
877 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
878 | ret = 0; |
879 | break; | |
149b9a9d YB |
880 | case LTTNG_KERNEL_UPROBE: |
881 | lttng_uprobes_unregister(event); | |
882 | ret = 0; | |
883 | break; | |
e884017c | 884 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
885 | default: |
886 | WARN_ON_ONCE(1); | |
887 | } | |
3c997079 MD |
888 | if (!ret) |
889 | event->registered = 0; | |
dda6a249 MD |
890 | return ret; |
891 | } | |
892 | ||
893 | /* | |
894 | * Only used internally at session destruction. | |
895 | */ | |
be066e6c | 896 | static |
a90917c3 | 897 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 898 | { |
edeb3137 MD |
899 | switch (event->instrumentation) { |
900 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 901 | lttng_event_put(event->desc); |
edeb3137 MD |
902 | break; |
903 | case LTTNG_KERNEL_KPROBE: | |
904 | module_put(event->desc->owner); | |
905 | lttng_kprobes_destroy_private(event); | |
906 | break; | |
7371f44c MD |
907 | case LTTNG_KERNEL_KRETPROBE: |
908 | module_put(event->desc->owner); | |
909 | lttng_kretprobes_destroy_private(event); | |
910 | break; | |
259b6cb3 | 911 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 912 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 913 | break; |
149b9a9d YB |
914 | case LTTNG_KERNEL_UPROBE: |
915 | module_put(event->desc->owner); | |
916 | lttng_uprobes_destroy_private(event); | |
917 | break; | |
e884017c | 918 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
919 | default: |
920 | WARN_ON_ONCE(1); | |
921 | } | |
dda6a249 | 922 | list_del(&event->list); |
8070f5c0 | 923 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 924 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
925 | } |
926 | ||
d1f652f8 MD |
927 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
928 | enum tracker_type tracker_type) | |
e0130fab | 929 | { |
d1f652f8 MD |
930 | switch (tracker_type) { |
931 | case TRACKER_PID: | |
932 | return &session->pid_tracker; | |
933 | case TRACKER_VPID: | |
934 | return &session->vpid_tracker; | |
935 | case TRACKER_UID: | |
936 | return &session->uid_tracker; | |
937 | case TRACKER_VUID: | |
938 | return &session->vuid_tracker; | |
939 | case TRACKER_GID: | |
940 | return &session->gid_tracker; | |
941 | case TRACKER_VGID: | |
942 | return &session->vgid_tracker; | |
943 | default: | |
944 | WARN_ON_ONCE(1); | |
945 | return NULL; | |
946 | } | |
947 | } | |
948 | ||
949 | int lttng_session_track_id(struct lttng_session *session, | |
950 | enum tracker_type tracker_type, int id) | |
951 | { | |
952 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
953 | int ret; |
954 | ||
d1f652f8 MD |
955 | tracker = get_tracker(session, tracker_type); |
956 | if (!tracker) | |
957 | return -EINVAL; | |
958 | if (id < -1) | |
e0130fab MD |
959 | return -EINVAL; |
960 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
961 | if (id == -1) { |
962 | /* track all ids: destroy tracker. */ | |
963 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
964 | ret = 0; |
965 | } else { | |
d1f652f8 | 966 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 967 | } |
e0130fab MD |
968 | mutex_unlock(&sessions_mutex); |
969 | return ret; | |
970 | } | |
971 | ||
d1f652f8 MD |
972 | int lttng_session_untrack_id(struct lttng_session *session, |
973 | enum tracker_type tracker_type, int id) | |
e0130fab | 974 | { |
d1f652f8 | 975 | struct lttng_id_tracker *tracker; |
e0130fab MD |
976 | int ret; |
977 | ||
d1f652f8 MD |
978 | tracker = get_tracker(session, tracker_type); |
979 | if (!tracker) | |
980 | return -EINVAL; | |
981 | if (id < -1) | |
e0130fab MD |
982 | return -EINVAL; |
983 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
984 | if (id == -1) { |
985 | /* untrack all ids: replace by empty tracker. */ | |
986 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 987 | } else { |
d1f652f8 | 988 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 989 | } |
e0130fab MD |
990 | mutex_unlock(&sessions_mutex); |
991 | return ret; | |
992 | } | |
993 | ||
7e6f9ef6 | 994 | static |
d1f652f8 | 995 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 996 | { |
d1f652f8 MD |
997 | struct lttng_id_tracker *id_tracker = m->private; |
998 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
999 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1000 | int iter = 0, i; |
1001 | ||
1002 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1003 | if (id_tracker_p) { |
1004 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1005 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1006 | |
f934e302 | 1007 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1008 | if (iter++ >= *pos) |
1009 | return e; | |
1010 | } | |
1011 | } | |
1012 | } else { | |
d1f652f8 | 1013 | /* ID tracker disabled. */ |
7e6f9ef6 | 1014 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1015 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1016 | } |
1017 | iter++; | |
1018 | } | |
1019 | /* End of list */ | |
1020 | return NULL; | |
1021 | } | |
1022 | ||
1023 | /* Called with sessions_mutex held. */ | |
1024 | static | |
d1f652f8 | 1025 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1026 | { |
d1f652f8 MD |
1027 | struct lttng_id_tracker *id_tracker = m->private; |
1028 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1029 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1030 | int iter = 0, i; |
1031 | ||
1032 | (*ppos)++; | |
d1f652f8 MD |
1033 | if (id_tracker_p) { |
1034 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1035 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1036 | |
f934e302 | 1037 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1038 | if (iter++ >= *ppos) |
1039 | return e; | |
1040 | } | |
1041 | } | |
1042 | } else { | |
d1f652f8 | 1043 | /* ID tracker disabled. */ |
7e6f9ef6 | 1044 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1045 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1046 | iter++; |
1047 | } | |
1048 | ||
1049 | /* End of list */ | |
1050 | return NULL; | |
1051 | } | |
1052 | ||
1053 | static | |
d1f652f8 | 1054 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1055 | { |
1056 | mutex_unlock(&sessions_mutex); | |
1057 | } | |
1058 | ||
1059 | static | |
d1f652f8 | 1060 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1061 | { |
d1f652f8 MD |
1062 | struct lttng_id_tracker *id_tracker = m->private; |
1063 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1064 | int id; | |
7e6f9ef6 | 1065 | |
d1f652f8 | 1066 | if (p == id_tracker_p) { |
7e6f9ef6 | 1067 | /* Tracker disabled. */ |
d1f652f8 | 1068 | id = -1; |
7e6f9ef6 | 1069 | } else { |
d1f652f8 | 1070 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1071 | |
d1f652f8 MD |
1072 | id = lttng_id_tracker_get_node_id(e); |
1073 | } | |
1074 | switch (id_tracker->tracker_type) { | |
1075 | case TRACKER_PID: | |
1076 | seq_printf(m, "process { pid = %d; };\n", id); | |
1077 | break; | |
1078 | case TRACKER_VPID: | |
1079 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1080 | break; | |
1081 | case TRACKER_UID: | |
1082 | seq_printf(m, "user { uid = %d; };\n", id); | |
1083 | break; | |
1084 | case TRACKER_VUID: | |
1085 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1086 | break; | |
1087 | case TRACKER_GID: | |
1088 | seq_printf(m, "group { gid = %d; };\n", id); | |
1089 | break; | |
1090 | case TRACKER_VGID: | |
1091 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1092 | break; | |
1093 | default: | |
1094 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1095 | } |
7e6f9ef6 MD |
1096 | return 0; |
1097 | } | |
1098 | ||
1099 | static | |
d1f652f8 MD |
1100 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1101 | .start = id_list_start, | |
1102 | .next = id_list_next, | |
1103 | .stop = id_list_stop, | |
1104 | .show = id_list_show, | |
7e6f9ef6 MD |
1105 | }; |
1106 | ||
1107 | static | |
d1f652f8 | 1108 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1109 | { |
d1f652f8 | 1110 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1111 | } |
1112 | ||
1113 | static | |
d1f652f8 | 1114 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1115 | { |
1116 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1117 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1118 | int ret; |
1119 | ||
d1f652f8 | 1120 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1121 | ret = seq_release(inode, file); |
d1f652f8 MD |
1122 | if (!ret) |
1123 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1124 | return ret; |
1125 | } | |
1126 | ||
d1f652f8 | 1127 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1128 | .owner = THIS_MODULE, |
d1f652f8 | 1129 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1130 | .read = seq_read, |
1131 | .llseek = seq_lseek, | |
d1f652f8 | 1132 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1133 | }; |
1134 | ||
d1f652f8 MD |
1135 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1136 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1137 | { |
d1f652f8 | 1138 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1139 | struct seq_file *m; |
1140 | int file_fd, ret; | |
1141 | ||
1142 | file_fd = lttng_get_unused_fd(); | |
1143 | if (file_fd < 0) { | |
1144 | ret = file_fd; | |
1145 | goto fd_error; | |
1146 | } | |
1147 | ||
d1f652f8 MD |
1148 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1149 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1150 | NULL, O_RDWR); |
d1f652f8 MD |
1151 | if (IS_ERR(tracker_ids_list_file)) { |
1152 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1153 | goto file_error; |
1154 | } | |
98d7281c MJ |
1155 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1156 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1157 | goto refcount_error; |
1158 | } | |
d1f652f8 | 1159 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1160 | if (ret < 0) |
1161 | goto open_error; | |
d1f652f8 MD |
1162 | m = tracker_ids_list_file->private_data; |
1163 | ||
1164 | m->private = get_tracker(session, tracker_type); | |
1165 | BUG_ON(!m->private); | |
1166 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1167 | |
1168 | return file_fd; | |
1169 | ||
1170 | open_error: | |
9c1f4643 MD |
1171 | atomic_long_dec(&session->file->f_count); |
1172 | refcount_error: | |
d1f652f8 | 1173 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1174 | file_error: |
1175 | put_unused_fd(file_fd); | |
1176 | fd_error: | |
1177 | return ret; | |
1178 | } | |
1179 | ||
3c997079 MD |
1180 | /* |
1181 | * Enabler management. | |
1182 | */ | |
1183 | static | |
4993071a PP |
1184 | int lttng_match_enabler_star_glob(const char *desc_name, |
1185 | const char *pattern) | |
3c997079 | 1186 | { |
cbc19040 MD |
1187 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1188 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1189 | return 0; |
1190 | return 1; | |
1191 | } | |
1192 | ||
1193 | static | |
4ecb5ad5 MD |
1194 | int lttng_match_enabler_name(const char *desc_name, |
1195 | const char *name) | |
3c997079 | 1196 | { |
4ecb5ad5 | 1197 | if (strcmp(desc_name, name)) |
3c997079 MD |
1198 | return 0; |
1199 | return 1; | |
1200 | } | |
1201 | ||
1202 | static | |
1203 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1204 | struct lttng_enabler *enabler) | |
1205 | { | |
4ecb5ad5 MD |
1206 | const char *desc_name, *enabler_name; |
1207 | ||
1208 | enabler_name = enabler->event_param.name; | |
1209 | switch (enabler->event_param.instrumentation) { | |
1210 | case LTTNG_KERNEL_TRACEPOINT: | |
1211 | desc_name = desc->name; | |
1212 | break; | |
1213 | case LTTNG_KERNEL_SYSCALL: | |
1214 | desc_name = desc->name; | |
1215 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1216 | desc_name += strlen("compat_"); | |
1217 | if (!strncmp(desc_name, "syscall_exit_", | |
1218 | strlen("syscall_exit_"))) { | |
1219 | desc_name += strlen("syscall_exit_"); | |
1220 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1221 | strlen("syscall_entry_"))) { | |
1222 | desc_name += strlen("syscall_entry_"); | |
1223 | } else { | |
1224 | WARN_ON_ONCE(1); | |
1225 | return -EINVAL; | |
1226 | } | |
1227 | break; | |
1228 | default: | |
1229 | WARN_ON_ONCE(1); | |
1230 | return -EINVAL; | |
1231 | } | |
3c997079 | 1232 | switch (enabler->type) { |
4993071a PP |
1233 | case LTTNG_ENABLER_STAR_GLOB: |
1234 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
3c997079 | 1235 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1236 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1237 | default: |
1238 | return -EINVAL; | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | static | |
1243 | int lttng_event_match_enabler(struct lttng_event *event, | |
1244 | struct lttng_enabler *enabler) | |
1245 | { | |
33a39a3c MD |
1246 | if (enabler->event_param.instrumentation != event->instrumentation) |
1247 | return 0; | |
3c997079 MD |
1248 | if (lttng_desc_match_enabler(event->desc, enabler) |
1249 | && event->chan == enabler->chan) | |
1250 | return 1; | |
1251 | else | |
1252 | return 0; | |
1253 | } | |
1254 | ||
1255 | static | |
1256 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1257 | struct lttng_enabler *enabler) | |
1258 | { | |
1259 | struct lttng_enabler_ref *enabler_ref; | |
1260 | ||
1261 | list_for_each_entry(enabler_ref, | |
1262 | &event->enablers_ref_head, node) { | |
1263 | if (enabler_ref->ref == enabler) | |
1264 | return enabler_ref; | |
1265 | } | |
1266 | return NULL; | |
1267 | } | |
1268 | ||
3c997079 | 1269 | static |
33a39a3c | 1270 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1271 | { |
1272 | struct lttng_session *session = enabler->chan->session; | |
1273 | struct lttng_probe_desc *probe_desc; | |
1274 | const struct lttng_event_desc *desc; | |
1275 | int i; | |
1276 | struct list_head *probe_list; | |
1277 | ||
1278 | probe_list = lttng_get_probe_list_head(); | |
1279 | /* | |
1280 | * For each probe event, if we find that a probe event matches | |
1281 | * our enabler, create an associated lttng_event if not | |
1282 | * already present. | |
1283 | */ | |
1284 | list_for_each_entry(probe_desc, probe_list, head) { | |
1285 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1286 | int found = 0; | |
1287 | struct hlist_head *head; | |
1288 | const char *event_name; | |
1289 | size_t name_len; | |
1290 | uint32_t hash; | |
1291 | struct lttng_event *event; | |
1292 | ||
1293 | desc = probe_desc->event_desc[i]; | |
1294 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1295 | continue; | |
1296 | event_name = desc->name; | |
1297 | name_len = strlen(event_name); | |
1298 | ||
1299 | /* | |
1300 | * Check if already created. | |
1301 | */ | |
1302 | hash = jhash(event_name, name_len, 0); | |
1303 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1304 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1305 | if (event->desc == desc |
1306 | && event->chan == enabler->chan) | |
1307 | found = 1; | |
1308 | } | |
1309 | if (found) | |
1310 | continue; | |
1311 | ||
1312 | /* | |
1313 | * We need to create an event for this | |
1314 | * event probe. | |
1315 | */ | |
1316 | event = _lttng_event_create(enabler->chan, | |
1317 | NULL, NULL, desc, | |
1318 | LTTNG_KERNEL_TRACEPOINT); | |
1319 | if (!event) { | |
1320 | printk(KERN_INFO "Unable to create event %s\n", | |
1321 | probe_desc->event_desc[i]->name); | |
1322 | } | |
1323 | } | |
1324 | } | |
1325 | } | |
1326 | ||
33a39a3c MD |
1327 | static |
1328 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1329 | { | |
1330 | int ret; | |
1331 | ||
1332 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1333 | WARN_ON_ONCE(ret); | |
1334 | } | |
1335 | ||
1336 | /* | |
1337 | * Create struct lttng_event if it is missing and present in the list of | |
1338 | * tracepoint probes. | |
1339 | * Should be called with sessions mutex held. | |
1340 | */ | |
1341 | static | |
1342 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1343 | { | |
1344 | switch (enabler->event_param.instrumentation) { | |
1345 | case LTTNG_KERNEL_TRACEPOINT: | |
1346 | lttng_create_tracepoint_if_missing(enabler); | |
1347 | break; | |
1348 | case LTTNG_KERNEL_SYSCALL: | |
1349 | lttng_create_syscall_if_missing(enabler); | |
1350 | break; | |
1351 | default: | |
1352 | WARN_ON_ONCE(1); | |
1353 | break; | |
1354 | } | |
1355 | } | |
1356 | ||
3c997079 MD |
1357 | /* |
1358 | * Create events associated with an enabler (if not already present), | |
1359 | * and add backward reference from the event to the enabler. | |
1360 | * Should be called with sessions mutex held. | |
1361 | */ | |
1362 | static | |
1363 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1364 | { | |
1365 | struct lttng_session *session = enabler->chan->session; | |
1366 | struct lttng_event *event; | |
1367 | ||
1368 | /* First ensure that probe events are created for this enabler. */ | |
1369 | lttng_create_event_if_missing(enabler); | |
1370 | ||
1371 | /* For each event matching enabler in session event list. */ | |
1372 | list_for_each_entry(event, &session->events, list) { | |
1373 | struct lttng_enabler_ref *enabler_ref; | |
1374 | ||
1375 | if (!lttng_event_match_enabler(event, enabler)) | |
1376 | continue; | |
1377 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1378 | if (!enabler_ref) { | |
1379 | /* | |
1380 | * If no backward ref, create it. | |
1381 | * Add backward ref from event to enabler. | |
1382 | */ | |
1383 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1384 | if (!enabler_ref) | |
1385 | return -ENOMEM; | |
1386 | enabler_ref->ref = enabler; | |
1387 | list_add(&enabler_ref->node, | |
1388 | &event->enablers_ref_head); | |
1389 | } | |
1390 | ||
f127e61e MD |
1391 | /* |
1392 | * Link filter bytecodes if not linked yet. | |
1393 | */ | |
1394 | lttng_enabler_event_link_bytecode(event, enabler); | |
1395 | ||
3c997079 MD |
1396 | /* TODO: merge event context. */ |
1397 | } | |
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | /* | |
1402 | * Called at module load: connect the probe on all enablers matching | |
1403 | * this event. | |
1404 | * Called with sessions lock held. | |
1405 | */ | |
1406 | int lttng_fix_pending_events(void) | |
1407 | { | |
1408 | struct lttng_session *session; | |
1409 | ||
1410 | list_for_each_entry(session, &sessions, list) | |
1411 | lttng_session_lazy_sync_enablers(session); | |
1412 | return 0; | |
1413 | } | |
1414 | ||
1415 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1416 | struct lttng_kernel_event *event_param, | |
1417 | struct lttng_channel *chan) | |
1418 | { | |
1419 | struct lttng_enabler *enabler; | |
1420 | ||
1421 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1422 | if (!enabler) | |
1423 | return NULL; | |
1424 | enabler->type = type; | |
07dfc1d0 | 1425 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1426 | memcpy(&enabler->event_param, event_param, |
1427 | sizeof(enabler->event_param)); | |
1428 | enabler->chan = chan; | |
1429 | /* ctx left NULL */ | |
4fd19d8a | 1430 | enabler->enabled = 0; |
3c997079 MD |
1431 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1432 | mutex_lock(&sessions_mutex); | |
1433 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1434 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1435 | mutex_unlock(&sessions_mutex); | |
1436 | return enabler; | |
1437 | } | |
1438 | ||
1439 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1440 | { | |
1441 | mutex_lock(&sessions_mutex); | |
1442 | enabler->enabled = 1; | |
1443 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1444 | mutex_unlock(&sessions_mutex); | |
1445 | return 0; | |
1446 | } | |
1447 | ||
1448 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1449 | { | |
1450 | mutex_lock(&sessions_mutex); | |
1451 | enabler->enabled = 0; | |
1452 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1453 | mutex_unlock(&sessions_mutex); | |
1454 | return 0; | |
1455 | } | |
1456 | ||
07dfc1d0 MD |
1457 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1458 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1459 | { | |
1460 | struct lttng_filter_bytecode_node *bytecode_node; | |
1461 | uint32_t bytecode_len; | |
1462 | int ret; | |
1463 | ||
1464 | ret = get_user(bytecode_len, &bytecode->len); | |
1465 | if (ret) | |
1466 | return ret; | |
1467 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1468 | GFP_KERNEL); | |
1469 | if (!bytecode_node) | |
1470 | return -ENOMEM; | |
1471 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1472 | sizeof(*bytecode) + bytecode_len); | |
1473 | if (ret) | |
1474 | goto error_free; | |
1475 | bytecode_node->enabler = enabler; | |
1476 | /* Enforce length based on allocated size */ | |
1477 | bytecode_node->bc.len = bytecode_len; | |
1478 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1479 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1480 | return 0; | |
1481 | ||
1482 | error_free: | |
1483 | kfree(bytecode_node); | |
1484 | return ret; | |
1485 | } | |
1486 | ||
3aed4dca FD |
1487 | int lttng_event_add_callsite(struct lttng_event *event, |
1488 | struct lttng_kernel_event_callsite __user *callsite) | |
1489 | { | |
1490 | ||
1491 | switch (event->instrumentation) { | |
1492 | case LTTNG_KERNEL_UPROBE: | |
1493 | return lttng_uprobes_add_callsite(event, callsite); | |
1494 | default: | |
1495 | return -EINVAL; | |
1496 | } | |
1497 | } | |
1498 | ||
3c997079 MD |
1499 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1500 | struct lttng_kernel_context *context_param) | |
1501 | { | |
1502 | return -ENOSYS; | |
1503 | } | |
1504 | ||
1505 | static | |
1506 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1507 | { | |
07dfc1d0 MD |
1508 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1509 | ||
1510 | /* Destroy filter bytecode */ | |
1511 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1512 | &enabler->filter_bytecode_head, node) { | |
1513 | kfree(filter_node); | |
1514 | } | |
1515 | ||
3c997079 MD |
1516 | /* Destroy contexts */ |
1517 | lttng_destroy_context(enabler->ctx); | |
1518 | ||
1519 | list_del(&enabler->node); | |
1520 | kfree(enabler); | |
1521 | } | |
1522 | ||
1523 | /* | |
1524 | * lttng_session_sync_enablers should be called just before starting a | |
1525 | * session. | |
1526 | * Should be called with sessions mutex held. | |
1527 | */ | |
1528 | static | |
1529 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1530 | { | |
1531 | struct lttng_enabler *enabler; | |
1532 | struct lttng_event *event; | |
1533 | ||
1534 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1535 | lttng_enabler_ref_events(enabler); | |
1536 | /* | |
1537 | * For each event, if at least one of its enablers is enabled, | |
1538 | * and its channel and session transient states are enabled, we | |
1539 | * enable the event, else we disable it. | |
1540 | */ | |
1541 | list_for_each_entry(event, &session->events, list) { | |
1542 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1543 | struct lttng_bytecode_runtime *runtime; |
1544 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1545 | |
4ecb5ad5 MD |
1546 | switch (event->instrumentation) { |
1547 | case LTTNG_KERNEL_TRACEPOINT: | |
1548 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1549 | /* Enable events */ |
1550 | list_for_each_entry(enabler_ref, | |
1551 | &event->enablers_ref_head, node) { | |
1552 | if (enabler_ref->ref->enabled) { | |
1553 | enabled = 1; | |
1554 | break; | |
1555 | } | |
1556 | } | |
4ecb5ad5 MD |
1557 | break; |
1558 | default: | |
3c997079 MD |
1559 | /* Not handled with lazy sync. */ |
1560 | continue; | |
1561 | } | |
1562 | /* | |
1563 | * Enabled state is based on union of enablers, with | |
1564 | * intesection of session and channel transient enable | |
1565 | * states. | |
1566 | */ | |
1567 | enabled = enabled && session->tstate && event->chan->tstate; | |
1568 | ||
a8f2d0c7 | 1569 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1570 | /* |
1571 | * Sync tracepoint registration with event enabled | |
1572 | * state. | |
1573 | */ | |
1574 | if (enabled) { | |
1575 | register_event(event); | |
1576 | } else { | |
1577 | _lttng_event_unregister(event); | |
1578 | } | |
07dfc1d0 MD |
1579 | |
1580 | /* Check if has enablers without bytecode enabled */ | |
1581 | list_for_each_entry(enabler_ref, | |
1582 | &event->enablers_ref_head, node) { | |
1583 | if (enabler_ref->ref->enabled | |
1584 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1585 | has_enablers_without_bytecode = 1; | |
1586 | break; | |
1587 | } | |
1588 | } | |
1589 | event->has_enablers_without_bytecode = | |
1590 | has_enablers_without_bytecode; | |
1591 | ||
1592 | /* Enable filters */ | |
1593 | list_for_each_entry(runtime, | |
f127e61e | 1594 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1595 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1596 | } |
1597 | } | |
1598 | ||
1599 | /* | |
1600 | * Apply enablers to session events, adding events to session if need | |
1601 | * be. It is required after each modification applied to an active | |
1602 | * session, and right before session "start". | |
1603 | * "lazy" sync means we only sync if required. | |
1604 | * Should be called with sessions mutex held. | |
1605 | */ | |
1606 | static | |
1607 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1608 | { | |
1609 | /* We can skip if session is not active */ | |
1610 | if (!session->active) | |
1611 | return; | |
1612 | lttng_session_sync_enablers(session); | |
1613 | } | |
1614 | ||
1ec3f75a | 1615 | /* |
d83004aa JD |
1616 | * Serialize at most one packet worth of metadata into a metadata |
1617 | * channel. | |
92d9f5e6 MD |
1618 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1619 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1620 | * allows us to do racy operations such as looking for remaining space left in | |
1621 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1622 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1623 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1624 | * Returns the number of bytes written in the channel, 0 if no data |
1625 | * was written and a negative value on error. | |
1ec3f75a | 1626 | */ |
b3b8072b MD |
1627 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1628 | struct channel *chan) | |
d83004aa JD |
1629 | { |
1630 | struct lib_ring_buffer_ctx ctx; | |
1631 | int ret = 0; | |
1632 | size_t len, reserve_len; | |
1633 | ||
f613e3e6 | 1634 | /* |
92d9f5e6 MD |
1635 | * Ensure we support mutiple get_next / put sequences followed by |
1636 | * put_next. The metadata cache lock protects reading the metadata | |
1637 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1638 | * "flush" operations on the buffer invoked by different processes. | |
1639 | * Moreover, since the metadata cache memory can be reallocated, we | |
1640 | * need to have exclusive access against updates even though we only | |
1641 | * read it. | |
f613e3e6 | 1642 | */ |
92d9f5e6 | 1643 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1644 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1645 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1646 | goto end; |
f613e3e6 | 1647 | |
9616f0bf JD |
1648 | /* Metadata regenerated, change the version. */ |
1649 | if (stream->metadata_cache->version != stream->version) | |
1650 | stream->version = stream->metadata_cache->version; | |
1651 | ||
d83004aa | 1652 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1653 | stream->metadata_in; |
9de2c215 | 1654 | if (!len) |
de23d59d | 1655 | goto end; |
d83004aa | 1656 | reserve_len = min_t(size_t, |
b3b8072b | 1657 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1658 | len); |
b3b8072b | 1659 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1660 | sizeof(char), -1); |
1661 | /* | |
1662 | * If reservation failed, return an error to the caller. | |
1663 | */ | |
b3b8072b | 1664 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1665 | if (ret != 0) { |
1666 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1667 | goto end; | |
1668 | } | |
b3b8072b | 1669 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1670 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1671 | reserve_len); |
b3b8072b | 1672 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1673 | stream->metadata_in += reserve_len; |
d83004aa JD |
1674 | ret = reserve_len; |
1675 | ||
1676 | end: | |
92d9f5e6 | 1677 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1678 | return ret; |
1679 | } | |
1680 | ||
1681 | /* | |
1682 | * Write the metadata to the metadata cache. | |
1683 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1684 | * The metadata cache lock protects us from concurrent read access from |
1685 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1686 | */ |
a90917c3 | 1687 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1688 | const char *fmt, ...) |
1689 | { | |
c099397a | 1690 | char *str; |
d83004aa | 1691 | size_t len; |
c099397a | 1692 | va_list ap; |
d83004aa | 1693 | struct lttng_metadata_stream *stream; |
c099397a | 1694 | |
a8f2d0c7 | 1695 | WARN_ON_ONCE(!READ_ONCE(session->active)); |
c099397a MD |
1696 | |
1697 | va_start(ap, fmt); | |
1698 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1699 | va_end(ap); | |
1700 | if (!str) | |
1701 | return -ENOMEM; | |
1702 | ||
1ec3f75a | 1703 | len = strlen(str); |
92d9f5e6 | 1704 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1705 | if (session->metadata_cache->metadata_written + len > |
1706 | session->metadata_cache->cache_alloc) { | |
1707 | char *tmp_cache_realloc; | |
1708 | unsigned int tmp_cache_alloc_size; | |
1709 | ||
1710 | tmp_cache_alloc_size = max_t(unsigned int, | |
1711 | session->metadata_cache->cache_alloc + len, | |
1712 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 1713 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1714 | if (!tmp_cache_realloc) |
1715 | goto err; | |
a606b6e8 ML |
1716 | if (session->metadata_cache->data) { |
1717 | memcpy(tmp_cache_realloc, | |
1718 | session->metadata_cache->data, | |
1719 | session->metadata_cache->cache_alloc); | |
1720 | vfree(session->metadata_cache->data); | |
1721 | } | |
1722 | ||
d83004aa JD |
1723 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1724 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1725 | } |
d83004aa JD |
1726 | memcpy(session->metadata_cache->data + |
1727 | session->metadata_cache->metadata_written, | |
1728 | str, len); | |
1729 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1730 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1731 | kfree(str); |
d83004aa JD |
1732 | |
1733 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1734 | wake_up_interruptible(&stream->read_wait); | |
1735 | ||
1736 | return 0; | |
1737 | ||
1738 | err: | |
92d9f5e6 | 1739 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1740 | kfree(str); |
1741 | return -ENOMEM; | |
c099397a MD |
1742 | } |
1743 | ||
f513b2bf MD |
1744 | static |
1745 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1746 | { | |
1747 | size_t i; | |
1748 | ||
1749 | for (i = 0; i < nesting; i++) { | |
1750 | int ret; | |
1751 | ||
1752 | ret = lttng_metadata_printf(session, " "); | |
1753 | if (ret) { | |
1754 | return ret; | |
1755 | } | |
1756 | } | |
1757 | return 0; | |
1758 | } | |
1759 | ||
ceabb767 MD |
1760 | static |
1761 | int lttng_field_name_statedump(struct lttng_session *session, | |
1762 | const struct lttng_event_field *field, | |
1763 | size_t nesting) | |
1764 | { | |
1765 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
1766 | } | |
1767 | ||
1768 | static | |
1769 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
1770 | const struct lttng_type *type, | |
1771 | size_t nesting) | |
1772 | { | |
1773 | int ret; | |
1774 | ||
1775 | WARN_ON_ONCE(type->atype != atype_integer); | |
1776 | ret = print_tabs(session, nesting); | |
1777 | if (ret) | |
1778 | return ret; | |
1779 | ret = lttng_metadata_printf(session, | |
1780 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
1781 | type->u.integer.size, | |
1782 | type->u.integer.alignment, | |
1783 | type->u.integer.signedness, | |
1784 | (type->u.integer.encoding == lttng_encode_none) | |
1785 | ? "none" | |
1786 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
1787 | ? "UTF8" | |
1788 | : "ASCII", | |
1789 | type->u.integer.base, | |
1790 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1791 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
1792 | #else | |
1793 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
1794 | #endif | |
1795 | ); | |
1796 | return ret; | |
1797 | } | |
1798 | ||
f513b2bf MD |
1799 | /* |
1800 | * Must be called with sessions_mutex held. | |
1801 | */ | |
1802 | static | |
1803 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1804 | const struct lttng_type *type, | |
1805 | size_t nesting) | |
1806 | { | |
1807 | int ret; | |
1808 | uint32_t i, nr_fields; | |
ceabb767 MD |
1809 | unsigned int alignment; |
1810 | ||
1811 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
1812 | |
1813 | ret = print_tabs(session, nesting); | |
1814 | if (ret) | |
1815 | return ret; | |
1816 | ret = lttng_metadata_printf(session, | |
1817 | "struct {\n"); | |
1818 | if (ret) | |
1819 | return ret; | |
ceabb767 | 1820 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
1821 | for (i = 0; i < nr_fields; i++) { |
1822 | const struct lttng_event_field *iter_field; | |
1823 | ||
ceabb767 | 1824 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
1825 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
1826 | if (ret) | |
1827 | return ret; | |
1828 | } | |
1829 | ret = print_tabs(session, nesting); | |
1830 | if (ret) | |
1831 | return ret; | |
ceabb767 MD |
1832 | alignment = type->u.struct_nestable.alignment; |
1833 | if (alignment) { | |
1834 | ret = lttng_metadata_printf(session, | |
1835 | "} align(%u)", | |
1836 | alignment); | |
1837 | } else { | |
1838 | ret = lttng_metadata_printf(session, | |
1839 | "}"); | |
1840 | } | |
f513b2bf MD |
1841 | return ret; |
1842 | } | |
1843 | ||
1844 | /* | |
1845 | * Must be called with sessions_mutex held. | |
1846 | */ | |
1847 | static | |
ceabb767 | 1848 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1849 | const struct lttng_event_field *field, |
1850 | size_t nesting) | |
1851 | { | |
1852 | int ret; | |
1853 | ||
1854 | ret = _lttng_struct_type_statedump(session, | |
1855 | &field->type, nesting); | |
1856 | if (ret) | |
1857 | return ret; | |
ceabb767 | 1858 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
1859 | } |
1860 | ||
65c85aa6 MD |
1861 | /* |
1862 | * Must be called with sessions_mutex held. | |
1863 | */ | |
1864 | static | |
1865 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1866 | const struct lttng_type *type, | |
1867 | size_t nesting) | |
1868 | { | |
1869 | int ret; | |
1870 | uint32_t i, nr_choices; | |
1871 | ||
ceabb767 MD |
1872 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
1873 | /* | |
1874 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
1875 | */ | |
1876 | if (type->u.variant_nestable.alignment != 0) | |
1877 | return -EINVAL; | |
65c85aa6 MD |
1878 | ret = print_tabs(session, nesting); |
1879 | if (ret) | |
1880 | return ret; | |
1881 | ret = lttng_metadata_printf(session, | |
1882 | "variant <_%s> {\n", | |
ceabb767 | 1883 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
1884 | if (ret) |
1885 | return ret; | |
ceabb767 | 1886 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
1887 | for (i = 0; i < nr_choices; i++) { |
1888 | const struct lttng_event_field *iter_field; | |
1889 | ||
ceabb767 | 1890 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
1891 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
1892 | if (ret) | |
1893 | return ret; | |
1894 | } | |
1895 | ret = print_tabs(session, nesting); | |
1896 | if (ret) | |
1897 | return ret; | |
1898 | ret = lttng_metadata_printf(session, | |
1899 | "}"); | |
1900 | return ret; | |
1901 | } | |
1902 | ||
1903 | /* | |
1904 | * Must be called with sessions_mutex held. | |
1905 | */ | |
1906 | static | |
ceabb767 | 1907 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
1908 | const struct lttng_event_field *field, |
1909 | size_t nesting) | |
1910 | { | |
1911 | int ret; | |
1912 | ||
1913 | ret = _lttng_variant_type_statedump(session, | |
1914 | &field->type, nesting); | |
1915 | if (ret) | |
1916 | return ret; | |
ceabb767 | 1917 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
1918 | } |
1919 | ||
f513b2bf MD |
1920 | /* |
1921 | * Must be called with sessions_mutex held. | |
1922 | */ | |
1923 | static | |
ceabb767 | 1924 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1925 | const struct lttng_event_field *field, |
1926 | size_t nesting) | |
1927 | { | |
1928 | int ret; | |
1929 | const struct lttng_type *elem_type; | |
1930 | ||
ceabb767 MD |
1931 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
1932 | ||
1933 | if (field->type.u.array_nestable.alignment) { | |
1934 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
1935 | if (ret) |
1936 | return ret; | |
ceabb767 MD |
1937 | ret = lttng_metadata_printf(session, |
1938 | "struct { } align(%u) _%s_padding;\n", | |
1939 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
1940 | field->name); | |
1941 | if (ret) | |
1942 | return ret; | |
1943 | } | |
1944 | /* | |
1945 | * Nested compound types: Only array of structures and variants are | |
1946 | * currently supported. | |
1947 | */ | |
1948 | elem_type = field->type.u.array_nestable.elem_type; | |
1949 | switch (elem_type->atype) { | |
1950 | case atype_integer: | |
1951 | case atype_struct_nestable: | |
1952 | case atype_variant_nestable: | |
1953 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
1954 | if (ret) |
1955 | return ret; | |
1956 | break; | |
ceabb767 | 1957 | |
f513b2bf MD |
1958 | default: |
1959 | return -EINVAL; | |
1960 | } | |
1961 | ret = lttng_metadata_printf(session, | |
1962 | " _%s[%u];\n", | |
1963 | field->name, | |
ceabb767 | 1964 | field->type.u.array_nestable.length); |
f513b2bf MD |
1965 | return ret; |
1966 | } | |
1967 | ||
1968 | /* | |
1969 | * Must be called with sessions_mutex held. | |
1970 | */ | |
1971 | static | |
ceabb767 | 1972 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1973 | const struct lttng_event_field *field, |
1974 | size_t nesting) | |
1975 | { | |
1976 | int ret; | |
1977 | const char *length_name; | |
1978 | const struct lttng_type *elem_type; | |
1979 | ||
ceabb767 | 1980 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 1981 | |
ceabb767 MD |
1982 | length_name = field->type.u.sequence_nestable.length_name; |
1983 | ||
1984 | if (field->type.u.sequence_nestable.alignment) { | |
1985 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
1986 | if (ret) |
1987 | return ret; | |
ceabb767 MD |
1988 | ret = lttng_metadata_printf(session, |
1989 | "struct { } align(%u) _%s_padding;\n", | |
1990 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
1991 | field->name); | |
1992 | if (ret) | |
1993 | return ret; | |
1994 | } | |
1995 | ||
1996 | /* | |
1997 | * Nested compound types: Only array of structures and variants are | |
1998 | * currently supported. | |
1999 | */ | |
2000 | elem_type = field->type.u.sequence_nestable.elem_type; | |
2001 | switch (elem_type->atype) { | |
2002 | case atype_integer: | |
2003 | case atype_struct_nestable: | |
2004 | case atype_variant_nestable: | |
2005 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2006 | if (ret) |
2007 | return ret; | |
2008 | break; | |
ceabb767 | 2009 | |
f513b2bf MD |
2010 | default: |
2011 | return -EINVAL; | |
2012 | } | |
2013 | ret = lttng_metadata_printf(session, | |
2014 | " _%s[ _%s ];\n", | |
2015 | field->name, | |
ceabb767 | 2016 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
2017 | return ret; |
2018 | } | |
2019 | ||
141ddf28 MD |
2020 | /* |
2021 | * Must be called with sessions_mutex held. | |
2022 | */ | |
2023 | static | |
ceabb767 MD |
2024 | int _lttng_enum_type_statedump(struct lttng_session *session, |
2025 | const struct lttng_type *type, | |
141ddf28 MD |
2026 | size_t nesting) |
2027 | { | |
2028 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 2029 | const struct lttng_type *container_type; |
141ddf28 MD |
2030 | int ret; |
2031 | unsigned int i, nr_entries; | |
2032 | ||
ceabb767 MD |
2033 | container_type = type->u.enum_nestable.container_type; |
2034 | if (container_type->atype != atype_integer) { | |
2035 | ret = -EINVAL; | |
2036 | goto end; | |
2037 | } | |
2038 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
2039 | nr_entries = enum_desc->nr_entries; |
2040 | ||
2041 | ret = print_tabs(session, nesting); | |
2042 | if (ret) | |
2043 | goto end; | |
ceabb767 MD |
2044 | ret = lttng_metadata_printf(session, "enum : "); |
2045 | if (ret) | |
2046 | goto end; | |
2047 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 2048 | if (ret) |
ceabb767 MD |
2049 | goto end; |
2050 | ret = lttng_metadata_printf(session, " {\n"); | |
2051 | if (ret) | |
2052 | goto end; | |
141ddf28 MD |
2053 | /* Dump all entries */ |
2054 | for (i = 0; i < nr_entries; i++) { | |
2055 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2056 | int j, len; | |
2057 | ||
2058 | ret = print_tabs(session, nesting + 1); | |
2059 | if (ret) | |
2060 | goto end; | |
2061 | ret = lttng_metadata_printf(session, | |
2062 | "\""); | |
2063 | if (ret) | |
2064 | goto end; | |
2065 | len = strlen(entry->string); | |
2066 | /* Escape the character '"' */ | |
2067 | for (j = 0; j < len; j++) { | |
2068 | char c = entry->string[j]; | |
2069 | ||
2070 | switch (c) { | |
2071 | case '"': | |
2072 | ret = lttng_metadata_printf(session, | |
2073 | "\\\""); | |
2074 | break; | |
2075 | case '\\': | |
2076 | ret = lttng_metadata_printf(session, | |
2077 | "\\\\"); | |
2078 | break; | |
2079 | default: | |
2080 | ret = lttng_metadata_printf(session, | |
2081 | "%c", c); | |
2082 | break; | |
2083 | } | |
2084 | if (ret) | |
2085 | goto end; | |
2086 | } | |
08ad1061 PP |
2087 | ret = lttng_metadata_printf(session, "\""); |
2088 | if (ret) | |
2089 | goto end; | |
2090 | ||
2091 | if (entry->options.is_auto) { | |
2092 | ret = lttng_metadata_printf(session, ",\n"); | |
2093 | if (ret) | |
2094 | goto end; | |
141ddf28 | 2095 | } else { |
7c559490 MD |
2096 | ret = lttng_metadata_printf(session, |
2097 | " = "); | |
2098 | if (ret) | |
2099 | goto end; | |
2100 | if (entry->start.signedness) | |
141ddf28 | 2101 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2102 | "%lld", (long long) entry->start.value); |
2103 | else | |
2104 | ret = lttng_metadata_printf(session, | |
2105 | "%llu", entry->start.value); | |
2106 | if (ret) | |
2107 | goto end; | |
2108 | if (entry->start.signedness == entry->end.signedness && | |
2109 | entry->start.value | |
2110 | == entry->end.value) { | |
141ddf28 | 2111 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2112 | ",\n"); |
2113 | } else { | |
2114 | if (entry->end.signedness) { | |
2115 | ret = lttng_metadata_printf(session, | |
2116 | " ... %lld,\n", | |
2117 | (long long) entry->end.value); | |
2118 | } else { | |
2119 | ret = lttng_metadata_printf(session, | |
2120 | " ... %llu,\n", | |
2121 | entry->end.value); | |
2122 | } | |
141ddf28 | 2123 | } |
7c559490 MD |
2124 | if (ret) |
2125 | goto end; | |
141ddf28 | 2126 | } |
141ddf28 MD |
2127 | } |
2128 | ret = print_tabs(session, nesting); | |
2129 | if (ret) | |
2130 | goto end; | |
ceabb767 | 2131 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
2132 | end: |
2133 | return ret; | |
2134 | } | |
2135 | ||
d83004aa JD |
2136 | /* |
2137 | * Must be called with sessions_mutex held. | |
2138 | */ | |
c099397a | 2139 | static |
ceabb767 MD |
2140 | int _lttng_enum_field_statedump(struct lttng_session *session, |
2141 | const struct lttng_event_field *field, | |
2142 | size_t nesting) | |
2143 | { | |
2144 | int ret; | |
2145 | ||
2146 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
2147 | if (ret) | |
2148 | return ret; | |
2149 | return lttng_field_name_statedump(session, field, nesting); | |
2150 | } | |
2151 | ||
2152 | static | |
2153 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
2154 | const struct lttng_event_field *field, | |
2155 | size_t nesting) | |
2156 | { | |
2157 | int ret; | |
2158 | ||
2159 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
2160 | if (ret) | |
2161 | return ret; | |
2162 | return lttng_field_name_statedump(session, field, nesting); | |
2163 | } | |
2164 | ||
2165 | static | |
2166 | int _lttng_string_type_statedump(struct lttng_session *session, | |
2167 | const struct lttng_type *type, | |
2168 | size_t nesting) | |
2169 | { | |
2170 | int ret; | |
2171 | ||
2172 | WARN_ON_ONCE(type->atype != atype_string); | |
2173 | /* Default encoding is UTF8 */ | |
2174 | ret = print_tabs(session, nesting); | |
2175 | if (ret) | |
2176 | return ret; | |
2177 | ret = lttng_metadata_printf(session, | |
2178 | "string%s", | |
2179 | type->u.string.encoding == lttng_encode_ASCII ? | |
2180 | " { encoding = ASCII; }" : ""); | |
2181 | return ret; | |
2182 | } | |
2183 | ||
2184 | static | |
2185 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
2186 | const struct lttng_event_field *field, |
2187 | size_t nesting) | |
ceabb767 MD |
2188 | { |
2189 | int ret; | |
2190 | ||
2191 | WARN_ON_ONCE(field->type.atype != atype_string); | |
2192 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
2193 | if (ret) | |
2194 | return ret; | |
2195 | return lttng_field_name_statedump(session, field, nesting); | |
2196 | } | |
2197 | ||
2198 | /* | |
2199 | * Must be called with sessions_mutex held. | |
2200 | */ | |
2201 | static | |
2202 | int _lttng_type_statedump(struct lttng_session *session, | |
2203 | const struct lttng_type *type, | |
2204 | size_t nesting) | |
c099397a | 2205 | { |
c099397a | 2206 | int ret = 0; |
c099397a | 2207 | |
ceabb767 | 2208 | switch (type->atype) { |
8070f5c0 | 2209 | case atype_integer: |
ceabb767 | 2210 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 2211 | break; |
ceabb767 MD |
2212 | case atype_enum_nestable: |
2213 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 2214 | break; |
ceabb767 MD |
2215 | case atype_string: |
2216 | ret = _lttng_string_type_statedump(session, type, nesting); | |
2217 | break; | |
2218 | case atype_struct_nestable: | |
2219 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 2220 | break; |
ceabb767 MD |
2221 | case atype_variant_nestable: |
2222 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
2223 | break; | |
2224 | ||
2225 | /* Nested arrays and sequences are not supported yet. */ | |
2226 | case atype_array_nestable: | |
2227 | case atype_sequence_nestable: | |
2228 | default: | |
2229 | WARN_ON_ONCE(1); | |
2230 | return -EINVAL; | |
8070f5c0 | 2231 | } |
ceabb767 MD |
2232 | return ret; |
2233 | } | |
8070f5c0 | 2234 | |
ceabb767 MD |
2235 | /* |
2236 | * Must be called with sessions_mutex held. | |
2237 | */ | |
2238 | static | |
2239 | int _lttng_field_statedump(struct lttng_session *session, | |
2240 | const struct lttng_event_field *field, | |
2241 | size_t nesting) | |
2242 | { | |
2243 | int ret = 0; | |
27d2368e | 2244 | |
ceabb767 MD |
2245 | switch (field->type.atype) { |
2246 | case atype_integer: | |
2247 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
2248 | break; | |
2249 | case atype_enum_nestable: | |
2250 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 2251 | break; |
8070f5c0 | 2252 | case atype_string: |
ceabb767 | 2253 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 2254 | break; |
ceabb767 MD |
2255 | case atype_struct_nestable: |
2256 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 2257 | break; |
ceabb767 MD |
2258 | case atype_array_nestable: |
2259 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 2260 | break; |
ceabb767 MD |
2261 | case atype_sequence_nestable: |
2262 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 2263 | break; |
ceabb767 MD |
2264 | case atype_variant_nestable: |
2265 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 2266 | break; |
f513b2bf | 2267 | |
8070f5c0 MD |
2268 | default: |
2269 | WARN_ON_ONCE(1); | |
2270 | return -EINVAL; | |
2271 | } | |
2272 | return ret; | |
2273 | } | |
2274 | ||
2275 | static | |
a90917c3 | 2276 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2277 | struct lttng_ctx *ctx) |
2278 | { | |
2279 | int ret = 0; | |
2280 | int i; | |
2281 | ||
2282 | if (!ctx) | |
2283 | return 0; | |
2284 | for (i = 0; i < ctx->nr_fields; i++) { | |
2285 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2286 | ||
f513b2bf | 2287 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2288 | if (ret) |
2289 | return ret; | |
2290 | } | |
2291 | return ret; | |
2292 | } | |
2293 | ||
2294 | static | |
a90917c3 MD |
2295 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2296 | struct lttng_event *event) | |
8070f5c0 MD |
2297 | { |
2298 | const struct lttng_event_desc *desc = event->desc; | |
2299 | int ret = 0; | |
2300 | int i; | |
2301 | ||
2302 | for (i = 0; i < desc->nr_fields; i++) { | |
2303 | const struct lttng_event_field *field = &desc->fields[i]; | |
2304 | ||
f513b2bf | 2305 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2306 | if (ret) |
2307 | return ret; | |
c099397a MD |
2308 | } |
2309 | return ret; | |
2310 | } | |
2311 | ||
d83004aa JD |
2312 | /* |
2313 | * Must be called with sessions_mutex held. | |
2314 | */ | |
c099397a | 2315 | static |
a90917c3 MD |
2316 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2317 | struct lttng_channel *chan, | |
2318 | struct lttng_event *event) | |
c099397a MD |
2319 | { |
2320 | int ret = 0; | |
2321 | ||
a8f2d0c7 | 2322 | if (event->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2323 | return 0; |
d83004aa | 2324 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2325 | return 0; |
2326 | ||
2327 | ret = lttng_metadata_printf(session, | |
2328 | "event {\n" | |
ae734547 | 2329 | " name = \"%s\";\n" |
c099397a | 2330 | " id = %u;\n" |
b9074a1b | 2331 | " stream_id = %u;\n", |
c099397a MD |
2332 | event->desc->name, |
2333 | event->id, | |
2334 | event->chan->id); | |
2335 | if (ret) | |
2336 | goto end; | |
2337 | ||
b9074a1b MD |
2338 | if (event->ctx) { |
2339 | ret = lttng_metadata_printf(session, | |
2340 | " context := struct {\n"); | |
2341 | if (ret) | |
2342 | goto end; | |
2343 | } | |
a90917c3 | 2344 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2345 | if (ret) |
2346 | goto end; | |
b9074a1b MD |
2347 | if (event->ctx) { |
2348 | ret = lttng_metadata_printf(session, | |
2349 | " };\n"); | |
2350 | if (ret) | |
2351 | goto end; | |
2352 | } | |
8070f5c0 MD |
2353 | |
2354 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2355 | " fields := struct {\n" |
2356 | ); | |
2357 | if (ret) | |
2358 | goto end; | |
2359 | ||
a90917c3 | 2360 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2361 | if (ret) |
2362 | goto end; | |
2363 | ||
2364 | /* | |
2365 | * LTTng space reservation can only reserve multiples of the | |
2366 | * byte size. | |
2367 | */ | |
2368 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2369 | " };\n" |
2370 | "};\n\n"); | |
c099397a MD |
2371 | if (ret) |
2372 | goto end; | |
2373 | ||
c099397a MD |
2374 | event->metadata_dumped = 1; |
2375 | end: | |
2376 | return ret; | |
2377 | ||
2378 | } | |
2379 | ||
d83004aa JD |
2380 | /* |
2381 | * Must be called with sessions_mutex held. | |
2382 | */ | |
c099397a | 2383 | static |
a90917c3 MD |
2384 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2385 | struct lttng_channel *chan) | |
c099397a MD |
2386 | { |
2387 | int ret = 0; | |
2388 | ||
a8f2d0c7 | 2389 | if (chan->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2390 | return 0; |
d83004aa JD |
2391 | |
2392 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2393 | return 0; |
2394 | ||
2395 | WARN_ON_ONCE(!chan->header_type); | |
2396 | ret = lttng_metadata_printf(session, | |
2397 | "stream {\n" | |
2398 | " id = %u;\n" | |
9115fbdc | 2399 | " event.header := %s;\n" |
b9074a1b | 2400 | " packet.context := struct packet_context;\n", |
c099397a MD |
2401 | chan->id, |
2402 | chan->header_type == 1 ? "struct event_header_compact" : | |
2403 | "struct event_header_large"); | |
2404 | if (ret) | |
2405 | goto end; | |
2406 | ||
b9074a1b MD |
2407 | if (chan->ctx) { |
2408 | ret = lttng_metadata_printf(session, | |
2409 | " event.context := struct {\n"); | |
2410 | if (ret) | |
2411 | goto end; | |
2412 | } | |
a90917c3 | 2413 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2414 | if (ret) |
2415 | goto end; | |
b9074a1b MD |
2416 | if (chan->ctx) { |
2417 | ret = lttng_metadata_printf(session, | |
2418 | " };\n"); | |
2419 | if (ret) | |
2420 | goto end; | |
2421 | } | |
8070f5c0 MD |
2422 | |
2423 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2424 | "};\n\n"); |
8070f5c0 | 2425 | |
c099397a MD |
2426 | chan->metadata_dumped = 1; |
2427 | end: | |
2428 | return ret; | |
2429 | } | |
2430 | ||
d83004aa JD |
2431 | /* |
2432 | * Must be called with sessions_mutex held. | |
2433 | */ | |
9115fbdc | 2434 | static |
a90917c3 | 2435 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2436 | { |
2437 | return lttng_metadata_printf(session, | |
2438 | "struct packet_context {\n" | |
a3ccff4f MD |
2439 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2440 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2441 | " uint64_t content_size;\n" |
2442 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2443 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2444 | " unsigned long events_discarded;\n" |
9115fbdc | 2445 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2446 | "};\n\n" |
9115fbdc MD |
2447 | ); |
2448 | } | |
2449 | ||
2450 | /* | |
2451 | * Compact header: | |
2452 | * id: range: 0 - 30. | |
2453 | * id 31 is reserved to indicate an extended header. | |
2454 | * | |
2455 | * Large header: | |
2456 | * id: range: 0 - 65534. | |
2457 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2458 | * |
2459 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2460 | */ |
2461 | static | |
a90917c3 | 2462 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2463 | { |
2464 | return lttng_metadata_printf(session, | |
2465 | "struct event_header_compact {\n" | |
2466 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2467 | " variant <id> {\n" | |
2468 | " struct {\n" | |
a3ccff4f | 2469 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2470 | " } compact;\n" |
2471 | " struct {\n" | |
2472 | " uint32_t id;\n" | |
a3ccff4f | 2473 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2474 | " } extended;\n" |
2475 | " } v;\n" | |
2476 | "} align(%u);\n" | |
2477 | "\n" | |
2478 | "struct event_header_large {\n" | |
2479 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2480 | " variant <id> {\n" | |
2481 | " struct {\n" | |
a3ccff4f | 2482 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2483 | " } compact;\n" |
2484 | " struct {\n" | |
2485 | " uint32_t id;\n" | |
a3ccff4f | 2486 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2487 | " } extended;\n" |
2488 | " } v;\n" | |
2489 | "} align(%u);\n\n", | |
a90917c3 MD |
2490 | lttng_alignof(uint32_t) * CHAR_BIT, |
2491 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2492 | ); |
2493 | } | |
2494 | ||
a3ccff4f MD |
2495 | /* |
2496 | * Approximation of NTP time of day to clock monotonic correlation, | |
2497 | * taken at start of trace. | |
2498 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2499 | * in future versions. | |
5283350b MD |
2500 | * This function may return a negative offset. It may happen if the |
2501 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
2502 | * |
2503 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
2504 | * y2038 compliant. | |
a3ccff4f MD |
2505 | */ |
2506 | static | |
8967b2a3 | 2507 | int64_t measure_clock_offset(void) |
a3ccff4f | 2508 | { |
dcb93448 | 2509 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2510 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2511 | int64_t offset; |
a3ccff4f | 2512 | unsigned long flags; |
3636085f | 2513 | struct timespec64 rts = { 0, 0 }; |
a3ccff4f MD |
2514 | |
2515 | /* Disable interrupts to increase correlation precision. */ | |
2516 | local_irq_save(flags); | |
2517 | monotonic[0] = trace_clock_read64(); | |
3636085f | 2518 | ktime_get_real_ts64(&rts); |
a3ccff4f MD |
2519 | monotonic[1] = trace_clock_read64(); |
2520 | local_irq_restore(flags); | |
2521 | ||
dcb93448 | 2522 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2523 | realtime = (uint64_t) rts.tv_sec * tcf; |
2524 | if (tcf == NSEC_PER_SEC) { | |
2525 | realtime += rts.tv_nsec; | |
2526 | } else { | |
2527 | uint64_t n = rts.tv_nsec * tcf; | |
2528 | ||
2529 | do_div(n, NSEC_PER_SEC); | |
2530 | realtime += n; | |
2531 | } | |
dcb93448 | 2532 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2533 | return offset; |
2534 | } | |
2535 | ||
3eb95be4 JR |
2536 | static |
2537 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
2538 | { | |
0f3eaad4 | 2539 | int ret = 0; |
3eb95be4 JR |
2540 | size_t i; |
2541 | char cur; | |
2542 | ||
2543 | i = 0; | |
2544 | cur = string[i]; | |
2545 | while (cur != '\0') { | |
2546 | switch (cur) { | |
2547 | case '\n': | |
2548 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
2549 | break; | |
2550 | case '\\': | |
2551 | case '"': | |
2552 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
2553 | if (ret) | |
2554 | goto error; | |
2555 | /* We still print the current char */ | |
2556 | /* Fallthrough */ | |
2557 | default: | |
2558 | ret = lttng_metadata_printf(session, "%c", cur); | |
2559 | break; | |
2560 | } | |
2561 | ||
2562 | if (ret) | |
2563 | goto error; | |
2564 | ||
2565 | cur = string[++i]; | |
2566 | } | |
2567 | error: | |
2568 | return ret; | |
2569 | } | |
2570 | ||
2571 | static | |
1c88f269 JR |
2572 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
2573 | const char *field_value) | |
3eb95be4 JR |
2574 | { |
2575 | int ret; | |
2576 | ||
1c88f269 | 2577 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
2578 | if (ret) |
2579 | goto error; | |
2580 | ||
1c88f269 | 2581 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
2582 | if (ret) |
2583 | goto error; | |
2584 | ||
2585 | ret = lttng_metadata_printf(session, "\";\n"); | |
2586 | ||
2587 | error: | |
2588 | return ret; | |
2589 | } | |
2590 | ||
c099397a MD |
2591 | /* |
2592 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2593 | * Must be called with sessions_mutex held. |
c099397a MD |
2594 | */ |
2595 | static | |
a90917c3 | 2596 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2597 | { |
30bdb6e4 | 2598 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2599 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 2600 | const char *product_uuid; |
a90917c3 MD |
2601 | struct lttng_channel *chan; |
2602 | struct lttng_event *event; | |
c099397a MD |
2603 | int ret = 0; |
2604 | ||
a8f2d0c7 | 2605 | if (!READ_ONCE(session->active)) |
c099397a MD |
2606 | return 0; |
2607 | if (session->metadata_dumped) | |
2608 | goto skip_session; | |
c099397a | 2609 | |
d793d5e1 | 2610 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2611 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2612 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2613 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2614 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2615 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2616 | |
2617 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2618 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2619 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2620 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2621 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2622 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2623 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2624 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2625 | "\n" |
2626 | "trace {\n" | |
2627 | " major = %u;\n" | |
2628 | " minor = %u;\n" | |
30bdb6e4 | 2629 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2630 | " byte_order = %s;\n" |
2631 | " packet.header := struct {\n" | |
2632 | " uint32_t magic;\n" | |
1ec3f75a | 2633 | " uint8_t uuid[16];\n" |
d793d5e1 | 2634 | " uint32_t stream_id;\n" |
5594698f | 2635 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2636 | " };\n" |
d793d5e1 | 2637 | "};\n\n", |
a90917c3 MD |
2638 | lttng_alignof(uint8_t) * CHAR_BIT, |
2639 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2640 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2641 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2642 | sizeof(unsigned long) * CHAR_BIT, |
2643 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2644 | CTF_SPEC_MAJOR, |
2645 | CTF_SPEC_MINOR, | |
d793d5e1 | 2646 | uuid_s, |
5214fa50 | 2647 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2648 | "be" |
2649 | #else | |
2650 | "le" | |
2651 | #endif | |
2652 | ); | |
2653 | if (ret) | |
2654 | goto end; | |
2655 | ||
99dc9597 MD |
2656 | ret = lttng_metadata_printf(session, |
2657 | "env {\n" | |
a6058143 | 2658 | " hostname = \"%s\";\n" |
c6c9e10f | 2659 | " domain = \"kernel\";\n" |
99dc9597 | 2660 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2661 | " kernel_release = \"%s\";\n" |
2662 | " kernel_version = \"%s\";\n" | |
2663 | " tracer_name = \"lttng-modules\";\n" | |
2664 | " tracer_major = %d;\n" | |
2665 | " tracer_minor = %d;\n" | |
2666 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 2667 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 2668 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2669 | utsname()->sysname, |
2670 | utsname()->release, | |
c6c9e10f MD |
2671 | utsname()->version, |
2672 | LTTNG_MODULES_MAJOR_VERSION, | |
2673 | LTTNG_MODULES_MINOR_VERSION, | |
2674 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2675 | ); |
2676 | if (ret) | |
2677 | goto end; | |
2678 | ||
1c88f269 JR |
2679 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
2680 | if (ret) | |
2681 | goto end; | |
2682 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
2683 | session->creation_time); | |
3eb95be4 JR |
2684 | if (ret) |
2685 | goto end; | |
2686 | ||
c88f762e GB |
2687 | /* Add the product UUID to the 'env' section */ |
2688 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
2689 | if (product_uuid) { | |
2690 | ret = lttng_metadata_printf(session, | |
2691 | " product_uuid = \"%s\";\n", | |
2692 | product_uuid | |
2693 | ); | |
2694 | if (ret) | |
2695 | goto end; | |
2696 | } | |
2697 | ||
2698 | /* Close the 'env' section */ | |
3eb95be4 JR |
2699 | ret = lttng_metadata_printf(session, "};\n\n"); |
2700 | if (ret) | |
2701 | goto end; | |
2702 | ||
a3ccff4f MD |
2703 | ret = lttng_metadata_printf(session, |
2704 | "clock {\n" | |
2754583e MD |
2705 | " name = \"%s\";\n", |
2706 | trace_clock_name() | |
a82c63f1 MD |
2707 | ); |
2708 | if (ret) | |
2709 | goto end; | |
2710 | ||
2711 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2712 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2713 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2714 | clock_uuid_s |
2715 | ); | |
2716 | if (ret) | |
2717 | goto end; | |
2718 | } | |
2719 | ||
2720 | ret = lttng_metadata_printf(session, | |
2754583e | 2721 | " description = \"%s\";\n" |
a3ccff4f MD |
2722 | " freq = %llu; /* Frequency, in Hz */\n" |
2723 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2724 | " offset = %lld;\n" |
a3ccff4f | 2725 | "};\n\n", |
2754583e | 2726 | trace_clock_description(), |
a3ccff4f | 2727 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2728 | (long long) measure_clock_offset() |
a3ccff4f MD |
2729 | ); |
2730 | if (ret) | |
2731 | goto end; | |
2732 | ||
2733 | ret = lttng_metadata_printf(session, | |
2734 | "typealias integer {\n" | |
2735 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2736 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2737 | "} := uint27_clock_monotonic_t;\n" |
2738 | "\n" | |
2739 | "typealias integer {\n" | |
2740 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2741 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2742 | "} := uint32_clock_monotonic_t;\n" |
2743 | "\n" | |
2744 | "typealias integer {\n" | |
2745 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2746 | " map = clock.%s.value;\n" |
a3ccff4f | 2747 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2748 | trace_clock_name(), |
a3ccff4f | 2749 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2750 | trace_clock_name(), |
2751 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2752 | trace_clock_name() | |
a3ccff4f MD |
2753 | ); |
2754 | if (ret) | |
2755 | goto end; | |
2756 | ||
a90917c3 | 2757 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2758 | if (ret) |
2759 | goto end; | |
2760 | ||
a90917c3 | 2761 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2762 | if (ret) |
2763 | goto end; | |
2764 | ||
c099397a MD |
2765 | skip_session: |
2766 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2767 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2768 | if (ret) |
2769 | goto end; | |
2770 | } | |
2771 | ||
2772 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2773 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2774 | if (ret) |
2775 | goto end; | |
2776 | } | |
2777 | session->metadata_dumped = 1; | |
2778 | end: | |
2779 | return ret; | |
2780 | } | |
2781 | ||
c0e31d2e | 2782 | /** |
a90917c3 | 2783 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2784 | * @transport: transport structure |
2785 | * | |
2786 | * Registers a transport which can be used as output to extract the data out of | |
c50bdba2 | 2787 | * LTTng. |
c0e31d2e | 2788 | */ |
a90917c3 | 2789 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e | 2790 | { |
c0e31d2e | 2791 | mutex_lock(&sessions_mutex); |
a90917c3 | 2792 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2793 | mutex_unlock(&sessions_mutex); |
2794 | } | |
a90917c3 | 2795 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2796 | |
2797 | /** | |
a90917c3 | 2798 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2799 | * @transport: transport structure |
2800 | */ | |
a90917c3 | 2801 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2802 | { |
2803 | mutex_lock(&sessions_mutex); | |
2804 | list_del(&transport->node); | |
2805 | mutex_unlock(&sessions_mutex); | |
2806 | } | |
a90917c3 | 2807 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2808 | |
894ce5dc | 2809 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2810 | |
2811 | enum cpuhp_state lttng_hp_prepare; | |
2812 | enum cpuhp_state lttng_hp_online; | |
2813 | ||
2814 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2815 | { | |
2816 | struct lttng_cpuhp_node *lttng_node; | |
2817 | ||
2818 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2819 | switch (lttng_node->component) { | |
2820 | case LTTNG_RING_BUFFER_FRONTEND: | |
2821 | return 0; | |
2822 | case LTTNG_RING_BUFFER_BACKEND: | |
2823 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2824 | case LTTNG_RING_BUFFER_ITER: | |
2825 | return 0; | |
2826 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2827 | return 0; | |
2828 | default: | |
2829 | return -EINVAL; | |
2830 | } | |
2831 | } | |
2832 | ||
2833 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2834 | { | |
2835 | struct lttng_cpuhp_node *lttng_node; | |
2836 | ||
2837 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2838 | switch (lttng_node->component) { | |
2839 | case LTTNG_RING_BUFFER_FRONTEND: | |
2840 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2841 | case LTTNG_RING_BUFFER_BACKEND: | |
2842 | return 0; | |
2843 | case LTTNG_RING_BUFFER_ITER: | |
2844 | return 0; | |
2845 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2846 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2847 | default: | |
2848 | return -EINVAL; | |
2849 | } | |
2850 | } | |
2851 | ||
2852 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2853 | { | |
2854 | struct lttng_cpuhp_node *lttng_node; | |
2855 | ||
2856 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2857 | switch (lttng_node->component) { | |
2858 | case LTTNG_RING_BUFFER_FRONTEND: | |
2859 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2860 | case LTTNG_RING_BUFFER_BACKEND: | |
2861 | return 0; | |
2862 | case LTTNG_RING_BUFFER_ITER: | |
2863 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2864 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2865 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2866 | default: | |
2867 | return -EINVAL; | |
2868 | } | |
2869 | } | |
2870 | ||
2871 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2872 | { | |
2873 | struct lttng_cpuhp_node *lttng_node; | |
2874 | ||
2875 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2876 | switch (lttng_node->component) { | |
2877 | case LTTNG_RING_BUFFER_FRONTEND: | |
2878 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2879 | case LTTNG_RING_BUFFER_BACKEND: | |
2880 | return 0; | |
2881 | case LTTNG_RING_BUFFER_ITER: | |
2882 | return 0; | |
2883 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2884 | return 0; | |
2885 | default: | |
2886 | return -EINVAL; | |
2887 | } | |
2888 | } | |
2889 | ||
2890 | static int __init lttng_init_cpu_hotplug(void) | |
2891 | { | |
2892 | int ret; | |
2893 | ||
2894 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2895 | lttng_hotplug_prepare, | |
2896 | lttng_hotplug_dead); | |
2897 | if (ret < 0) { | |
2898 | return ret; | |
2899 | } | |
2900 | lttng_hp_prepare = ret; | |
2901 | lttng_rb_set_hp_prepare(ret); | |
2902 | ||
2903 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2904 | lttng_hotplug_online, | |
2905 | lttng_hotplug_offline); | |
2906 | if (ret < 0) { | |
2907 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2908 | lttng_hp_prepare = 0; | |
2909 | return ret; | |
2910 | } | |
2911 | lttng_hp_online = ret; | |
2912 | lttng_rb_set_hp_online(ret); | |
2913 | ||
2914 | return 0; | |
2915 | } | |
2916 | ||
2917 | static void __exit lttng_exit_cpu_hotplug(void) | |
2918 | { | |
2919 | lttng_rb_set_hp_online(0); | |
2920 | cpuhp_remove_multi_state(lttng_hp_online); | |
2921 | lttng_rb_set_hp_prepare(0); | |
2922 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2923 | } | |
2924 | ||
1ee63d8d | 2925 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2926 | static int lttng_init_cpu_hotplug(void) |
2927 | { | |
2928 | return 0; | |
2929 | } | |
2930 | static void lttng_exit_cpu_hotplug(void) | |
2931 | { | |
2932 | } | |
1ee63d8d | 2933 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2934 | |
2935 | ||
a90917c3 | 2936 | static int __init lttng_events_init(void) |
4e3c1b9b | 2937 | { |
1c25284c MD |
2938 | int ret; |
2939 | ||
389d7070 | 2940 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2941 | if (ret) |
2942 | return ret; | |
2943 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
2944 | if (ret) |
2945 | return ret; | |
2946 | ret = lttng_probes_init(); | |
389d7070 MD |
2947 | if (ret) |
2948 | return ret; | |
07dfc1d0 | 2949 | ret = lttng_context_init(); |
20591cf7 MD |
2950 | if (ret) |
2951 | return ret; | |
07dfc1d0 MD |
2952 | ret = lttng_tracepoint_init(); |
2953 | if (ret) | |
2954 | goto error_tp; | |
a90917c3 | 2955 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2956 | if (!event_cache) { |
2957 | ret = -ENOMEM; | |
2958 | goto error_kmem; | |
2959 | } | |
80996790 | 2960 | ret = lttng_abi_init(); |
02119ee5 MD |
2961 | if (ret) |
2962 | goto error_abi; | |
0c956676 MD |
2963 | ret = lttng_logger_init(); |
2964 | if (ret) | |
2965 | goto error_logger; | |
1e367326 MD |
2966 | ret = lttng_init_cpu_hotplug(); |
2967 | if (ret) | |
2968 | goto error_hotplug; | |
101215b7 | 2969 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2970 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2971 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2972 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2973 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2974 | LTTNG_VERSION_NAME, |
2975 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2976 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2977 | #else | |
2978 | "", | |
2979 | #endif | |
2980 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2981 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2982 | #else | |
2983 | ""); | |
2984 | #endif | |
4e3c1b9b | 2985 | return 0; |
0c956676 | 2986 | |
1e367326 MD |
2987 | error_hotplug: |
2988 | lttng_logger_exit(); | |
0c956676 MD |
2989 | error_logger: |
2990 | lttng_abi_exit(); | |
02119ee5 | 2991 | error_abi: |
1c25284c | 2992 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2993 | error_kmem: |
2994 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2995 | error_tp: |
2996 | lttng_context_exit(); | |
101215b7 | 2997 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2998 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2999 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3000 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3001 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3002 | LTTNG_VERSION_NAME, |
3003 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3004 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3005 | #else | |
3006 | "", | |
3007 | #endif | |
3008 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3009 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3010 | #else | |
3011 | ""); | |
3012 | #endif | |
1c25284c | 3013 | return ret; |
4e3c1b9b MD |
3014 | } |
3015 | ||
a90917c3 | 3016 | module_init(lttng_events_init); |
11b5a3c2 | 3017 | |
a90917c3 | 3018 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 3019 | { |
a90917c3 | 3020 | struct lttng_session *session, *tmpsession; |
92e94819 | 3021 | |
1e367326 | 3022 | lttng_exit_cpu_hotplug(); |
0c956676 | 3023 | lttng_logger_exit(); |
80996790 | 3024 | lttng_abi_exit(); |
92e94819 | 3025 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 3026 | lttng_session_destroy(session); |
11b5a3c2 | 3027 | kmem_cache_destroy(event_cache); |
20591cf7 | 3028 | lttng_tracepoint_exit(); |
07dfc1d0 | 3029 | lttng_context_exit(); |
101215b7 | 3030 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3031 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3032 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3033 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3034 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3035 | LTTNG_VERSION_NAME, |
3036 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3037 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3038 | #else | |
3039 | "", | |
3040 | #endif | |
3041 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3042 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3043 | #else | |
3044 | ""); | |
3045 | #endif | |
4e3c1b9b | 3046 | } |
92e94819 | 3047 | |
a90917c3 | 3048 | module_exit(lttng_events_exit); |
11b5a3c2 | 3049 | |
101215b7 MJ |
3050 | #include "extra_version/patches.i" |
3051 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3052 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3053 | #endif | |
3054 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3055 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3056 | #endif | |
92e94819 MD |
3057 | MODULE_LICENSE("GPL and additional rights"); |
3058 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3059 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3060 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3061 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3062 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3063 | LTTNG_MODULES_EXTRAVERSION); |