Commit | Line | Data |
---|---|---|
9f36eaed MJ |
1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
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> |
a606b6e8 | 29 | #include <linux/vmalloc.h> |
41f229dc | 30 | #include <linux/uuid.h> |
3c997079 | 31 | |
241ae9a8 MD |
32 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */ |
33 | #include <wrapper/random.h> | |
34 | #include <wrapper/tracepoint.h> | |
35 | #include <wrapper/list.h> | |
cbc19040 | 36 | #include <wrapper/types.h> |
241ae9a8 MD |
37 | #include <lttng-kernel-version.h> |
38 | #include <lttng-events.h> | |
39 | #include <lttng-tracer.h> | |
40 | #include <lttng-abi-old.h> | |
5214fa50 | 41 | #include <lttng-endian.h> |
4993071a | 42 | #include <lttng-string-utils.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 MD |
71 | static |
72 | int _lttng_field_statedump(struct lttng_session *session, | |
73 | const struct lttng_event_field *field, | |
74 | size_t nesting); | |
c099397a | 75 | |
c099397a | 76 | void synchronize_trace(void) |
abcca994 | 77 | { |
92da05ce MJ |
78 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
79 | synchronize_rcu(); | |
80 | #else | |
abcca994 | 81 | synchronize_sched(); |
92da05ce MJ |
82 | #endif |
83 | ||
b8590f40 MD |
84 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
85 | #ifdef CONFIG_PREEMPT_RT_FULL | |
86 | synchronize_rcu(); | |
87 | #endif | |
88 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
89 | #ifdef CONFIG_PREEMPT_RT |
90 | synchronize_rcu(); | |
91 | #endif | |
b8590f40 | 92 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
93 | } |
94 | ||
3c997079 MD |
95 | void lttng_lock_sessions(void) |
96 | { | |
97 | mutex_lock(&sessions_mutex); | |
98 | } | |
99 | ||
100 | void lttng_unlock_sessions(void) | |
101 | { | |
102 | mutex_unlock(&sessions_mutex); | |
103 | } | |
104 | ||
105 | /* | |
106 | * Called with sessions lock held. | |
107 | */ | |
108 | int lttng_session_active(void) | |
109 | { | |
110 | struct lttng_session *iter; | |
111 | ||
112 | list_for_each_entry(iter, &sessions, list) { | |
113 | if (iter->active) | |
114 | return 1; | |
115 | } | |
116 | return 0; | |
117 | } | |
118 | ||
a90917c3 | 119 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 120 | { |
a90917c3 | 121 | struct lttng_session *session; |
d83004aa | 122 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 123 | int i; |
4e3c1b9b MD |
124 | |
125 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 126 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 127 | if (!session) |
d83004aa | 128 | goto err; |
4e3c1b9b | 129 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 130 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 131 | uuid_le_gen(&session->uuid); |
d83004aa JD |
132 | |
133 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
134 | GFP_KERNEL); | |
135 | if (!metadata_cache) | |
136 | goto err_free_session; | |
0ca42eb7 | 137 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
138 | if (!metadata_cache->data) |
139 | goto err_free_cache; | |
140 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
141 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 142 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
143 | session->metadata_cache = metadata_cache; |
144 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
145 | memcpy(&metadata_cache->uuid, &session->uuid, |
146 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
147 | INIT_LIST_HEAD(&session->enablers_head); |
148 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
149 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
150 | list_add(&session->list, &sessions); |
151 | mutex_unlock(&sessions_mutex); | |
152 | return session; | |
d83004aa JD |
153 | |
154 | err_free_cache: | |
155 | kfree(metadata_cache); | |
156 | err_free_session: | |
48f5e0b5 | 157 | lttng_kvfree(session); |
d83004aa JD |
158 | err: |
159 | mutex_unlock(&sessions_mutex); | |
160 | return NULL; | |
161 | } | |
162 | ||
163 | void metadata_cache_destroy(struct kref *kref) | |
164 | { | |
165 | struct lttng_metadata_cache *cache = | |
166 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 167 | vfree(cache->data); |
d83004aa | 168 | kfree(cache); |
4e3c1b9b MD |
169 | } |
170 | ||
a90917c3 | 171 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 172 | { |
a90917c3 MD |
173 | struct lttng_channel *chan, *tmpchan; |
174 | struct lttng_event *event, *tmpevent; | |
d83004aa | 175 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 176 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 177 | int ret; |
4e3c1b9b MD |
178 | |
179 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 180 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
181 | list_for_each_entry(chan, &session->chan, list) { |
182 | ret = lttng_syscalls_unregister(chan); | |
183 | WARN_ON(ret); | |
184 | } | |
dda6a249 | 185 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 186 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
187 | WARN_ON(ret); |
188 | } | |
abcca994 | 189 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
190 | list_for_each_entry_safe(enabler, tmpenabler, |
191 | &session->enablers_head, node) | |
192 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 193 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 194 | _lttng_event_destroy(event); |
d83004aa JD |
195 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
196 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 197 | _lttng_channel_destroy(chan); |
d83004aa JD |
198 | } |
199 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
200 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
201 | if (session->pid_tracker) |
202 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 203 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
204 | list_del(&session->list); |
205 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 206 | lttng_kvfree(session); |
4e3c1b9b MD |
207 | } |
208 | ||
601252cf MD |
209 | int lttng_session_statedump(struct lttng_session *session) |
210 | { | |
211 | int ret; | |
212 | ||
213 | mutex_lock(&sessions_mutex); | |
214 | ret = lttng_statedump_start(session); | |
215 | mutex_unlock(&sessions_mutex); | |
216 | return ret; | |
217 | } | |
218 | ||
a90917c3 | 219 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
220 | { |
221 | int ret = 0; | |
a90917c3 | 222 | struct lttng_channel *chan; |
c0e31d2e MD |
223 | |
224 | mutex_lock(&sessions_mutex); | |
225 | if (session->active) { | |
226 | ret = -EBUSY; | |
227 | goto end; | |
228 | } | |
c099397a | 229 | |
3c997079 MD |
230 | /* Set transient enabler state to "enabled" */ |
231 | session->tstate = 1; | |
232 | ||
4ef81e4a MD |
233 | /* We need to sync enablers with session before activation. */ |
234 | lttng_session_sync_enablers(session); | |
235 | ||
c099397a MD |
236 | /* |
237 | * Snapshot the number of events per channel to know the type of header | |
238 | * we need to use. | |
239 | */ | |
240 | list_for_each_entry(chan, &session->chan, list) { | |
241 | if (chan->header_type) | |
242 | continue; /* don't change it if session stop/restart */ | |
243 | if (chan->free_event_id < 31) | |
244 | chan->header_type = 1; /* compact */ | |
245 | else | |
246 | chan->header_type = 2; /* large */ | |
247 | } | |
248 | ||
64af2437 | 249 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
250 | list_for_each_entry(chan, &session->chan, list) { |
251 | if (chan->channel_type != METADATA_CHANNEL) | |
252 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
253 | } | |
64af2437 | 254 | |
a8f2d0c7 MJ |
255 | WRITE_ONCE(session->active, 1); |
256 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 257 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 258 | if (ret) { |
a8f2d0c7 | 259 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
260 | goto end; |
261 | } | |
262 | ret = lttng_statedump_start(session); | |
360f38ea | 263 | if (ret) |
a8f2d0c7 | 264 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
265 | end: |
266 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 267 | return ret; |
c0e31d2e MD |
268 | } |
269 | ||
a90917c3 | 270 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
271 | { |
272 | int ret = 0; | |
64af2437 | 273 | struct lttng_channel *chan; |
c0e31d2e MD |
274 | |
275 | mutex_lock(&sessions_mutex); | |
276 | if (!session->active) { | |
277 | ret = -EBUSY; | |
278 | goto end; | |
279 | } | |
a8f2d0c7 | 280 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
281 | |
282 | /* Set transient enabler state to "disabled" */ | |
283 | session->tstate = 0; | |
284 | lttng_session_sync_enablers(session); | |
64af2437 MD |
285 | |
286 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
287 | list_for_each_entry(chan, &session->chan, list) { |
288 | if (chan->channel_type != METADATA_CHANNEL) | |
289 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
290 | } | |
c0e31d2e MD |
291 | end: |
292 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 293 | return ret; |
c0e31d2e MD |
294 | } |
295 | ||
9616f0bf JD |
296 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
297 | { | |
298 | int ret = 0; | |
299 | struct lttng_channel *chan; | |
300 | struct lttng_event *event; | |
301 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
302 | struct lttng_metadata_stream *stream; | |
303 | ||
304 | mutex_lock(&sessions_mutex); | |
305 | if (!session->active) { | |
306 | ret = -EBUSY; | |
307 | goto end; | |
308 | } | |
309 | ||
310 | mutex_lock(&cache->lock); | |
311 | memset(cache->data, 0, cache->cache_alloc); | |
312 | cache->metadata_written = 0; | |
313 | cache->version++; | |
314 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
315 | stream->metadata_out = 0; | |
316 | stream->metadata_in = 0; | |
317 | } | |
318 | mutex_unlock(&cache->lock); | |
319 | ||
320 | session->metadata_dumped = 0; | |
321 | list_for_each_entry(chan, &session->chan, list) { | |
322 | chan->metadata_dumped = 0; | |
323 | } | |
324 | ||
325 | list_for_each_entry(event, &session->events, list) { | |
326 | event->metadata_dumped = 0; | |
327 | } | |
328 | ||
329 | ret = _lttng_session_metadata_statedump(session); | |
330 | ||
331 | end: | |
332 | mutex_unlock(&sessions_mutex); | |
333 | return ret; | |
334 | } | |
335 | ||
a90917c3 | 336 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 337 | { |
3c997079 | 338 | int ret = 0; |
e64957da | 339 | |
3c997079 MD |
340 | mutex_lock(&sessions_mutex); |
341 | if (channel->channel_type == METADATA_CHANNEL) { | |
342 | ret = -EPERM; | |
343 | goto end; | |
344 | } | |
345 | if (channel->enabled) { | |
346 | ret = -EEXIST; | |
347 | goto end; | |
348 | } | |
349 | /* Set transient enabler state to "enabled" */ | |
350 | channel->tstate = 1; | |
351 | lttng_session_sync_enablers(channel->session); | |
352 | /* Set atomically the state to "enabled" */ | |
a8f2d0c7 | 353 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
354 | end: |
355 | mutex_unlock(&sessions_mutex); | |
356 | return ret; | |
e64957da MD |
357 | } |
358 | ||
a90917c3 | 359 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 360 | { |
3c997079 | 361 | int ret = 0; |
e64957da | 362 | |
3c997079 MD |
363 | mutex_lock(&sessions_mutex); |
364 | if (channel->channel_type == METADATA_CHANNEL) { | |
365 | ret = -EPERM; | |
366 | goto end; | |
367 | } | |
368 | if (!channel->enabled) { | |
369 | ret = -EEXIST; | |
370 | goto end; | |
371 | } | |
372 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 373 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
374 | /* Set transient enabler state to "enabled" */ |
375 | channel->tstate = 0; | |
376 | lttng_session_sync_enablers(channel->session); | |
377 | end: | |
378 | mutex_unlock(&sessions_mutex); | |
379 | return ret; | |
e64957da MD |
380 | } |
381 | ||
a90917c3 | 382 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 383 | { |
3c997079 | 384 | int ret = 0; |
e64957da | 385 | |
3c997079 MD |
386 | mutex_lock(&sessions_mutex); |
387 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
388 | ret = -EPERM; | |
389 | goto end; | |
390 | } | |
391 | if (event->enabled) { | |
392 | ret = -EEXIST; | |
393 | goto end; | |
394 | } | |
a0493bef MD |
395 | switch (event->instrumentation) { |
396 | case LTTNG_KERNEL_TRACEPOINT: | |
397 | case LTTNG_KERNEL_SYSCALL: | |
398 | ret = -EINVAL; | |
399 | break; | |
400 | case LTTNG_KERNEL_KPROBE: | |
401 | case LTTNG_KERNEL_FUNCTION: | |
149b9a9d | 402 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 403 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 404 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
405 | break; |
406 | case LTTNG_KERNEL_KRETPROBE: | |
407 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
408 | break; | |
409 | default: | |
410 | WARN_ON_ONCE(1); | |
411 | ret = -EINVAL; | |
412 | } | |
3c997079 MD |
413 | end: |
414 | mutex_unlock(&sessions_mutex); | |
415 | return ret; | |
e64957da MD |
416 | } |
417 | ||
a90917c3 | 418 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 419 | { |
3c997079 | 420 | int ret = 0; |
e64957da | 421 | |
3c997079 MD |
422 | mutex_lock(&sessions_mutex); |
423 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
424 | ret = -EPERM; | |
425 | goto end; | |
426 | } | |
427 | if (!event->enabled) { | |
428 | ret = -EEXIST; | |
429 | goto end; | |
430 | } | |
a0493bef MD |
431 | switch (event->instrumentation) { |
432 | case LTTNG_KERNEL_TRACEPOINT: | |
433 | case LTTNG_KERNEL_SYSCALL: | |
434 | ret = -EINVAL; | |
435 | break; | |
436 | case LTTNG_KERNEL_KPROBE: | |
437 | case LTTNG_KERNEL_FUNCTION: | |
149b9a9d | 438 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 439 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 440 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
441 | break; |
442 | case LTTNG_KERNEL_KRETPROBE: | |
443 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
444 | break; | |
445 | default: | |
446 | WARN_ON_ONCE(1); | |
447 | ret = -EINVAL; | |
448 | } | |
3c997079 MD |
449 | end: |
450 | mutex_unlock(&sessions_mutex); | |
451 | return ret; | |
e64957da MD |
452 | } |
453 | ||
a90917c3 | 454 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 455 | { |
a90917c3 | 456 | struct lttng_transport *transport; |
f3d01b96 | 457 | |
a90917c3 | 458 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
459 | if (!strcmp(transport->name, name)) |
460 | return transport; | |
461 | } | |
462 | return NULL; | |
463 | } | |
464 | ||
a90917c3 | 465 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
466 | const char *transport_name, |
467 | void *buf_addr, | |
4e3c1b9b MD |
468 | size_t subbuf_size, size_t num_subbuf, |
469 | unsigned int switch_timer_interval, | |
d83004aa JD |
470 | unsigned int read_timer_interval, |
471 | enum channel_type channel_type) | |
4e3c1b9b | 472 | { |
a90917c3 MD |
473 | struct lttng_channel *chan; |
474 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
475 | |
476 | mutex_lock(&sessions_mutex); | |
d83004aa | 477 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 478 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 479 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
480 | if (!transport) { |
481 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
482 | transport_name); | |
c0e31d2e | 483 | goto notransport; |
f3d01b96 | 484 | } |
a33c9927 MD |
485 | if (!try_module_get(transport->owner)) { |
486 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
487 | goto notransport; | |
488 | } | |
a90917c3 | 489 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 490 | if (!chan) |
c0e31d2e | 491 | goto nomem; |
4e3c1b9b | 492 | chan->session = session; |
05d32c64 | 493 | chan->id = session->free_chan_id++; |
3b731ab1 | 494 | chan->ops = &transport->ops; |
125b4df4 MD |
495 | /* |
496 | * Note: the channel creation op already writes into the packet | |
497 | * headers. Therefore the "chan" information used as input | |
498 | * should be already accessible. | |
499 | */ | |
5f5ddf01 MD |
500 | chan->chan = transport->ops.channel_create(transport_name, |
501 | chan, buf_addr, subbuf_size, num_subbuf, | |
502 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
503 | if (!chan->chan) |
504 | goto create_error; | |
3c997079 | 505 | chan->tstate = 1; |
e64957da | 506 | chan->enabled = 1; |
a33c9927 | 507 | chan->transport = transport; |
d83004aa | 508 | chan->channel_type = channel_type; |
4e3c1b9b MD |
509 | list_add(&chan->list, &session->chan); |
510 | mutex_unlock(&sessions_mutex); | |
511 | return chan; | |
512 | ||
f3d01b96 MD |
513 | create_error: |
514 | kfree(chan); | |
c0e31d2e | 515 | nomem: |
a33c9927 MD |
516 | if (transport) |
517 | module_put(transport->owner); | |
c0e31d2e | 518 | notransport: |
e5382b6d | 519 | active: |
4e3c1b9b MD |
520 | mutex_unlock(&sessions_mutex); |
521 | return NULL; | |
522 | } | |
523 | ||
524 | /* | |
d83004aa JD |
525 | * Only used internally at session destruction for per-cpu channels, and |
526 | * when metadata channel is released. | |
527 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 528 | */ |
aa7c23a9 | 529 | static |
a90917c3 | 530 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 531 | { |
11b5a3c2 | 532 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 533 | module_put(chan->transport->owner); |
4e3c1b9b | 534 | list_del(&chan->list); |
8070f5c0 | 535 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
536 | kfree(chan); |
537 | } | |
538 | ||
d83004aa JD |
539 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
540 | { | |
541 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
542 | ||
543 | /* Protect the metadata cache with the sessions_mutex. */ | |
544 | mutex_lock(&sessions_mutex); | |
545 | _lttng_channel_destroy(chan); | |
546 | mutex_unlock(&sessions_mutex); | |
547 | } | |
548 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
549 | ||
550 | static | |
551 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
552 | { | |
553 | stream->finalized = 1; | |
554 | wake_up_interruptible(&stream->read_wait); | |
555 | } | |
556 | ||
e5382b6d MD |
557 | /* |
558 | * Supports event creation while tracing session is active. | |
3c997079 | 559 | * Needs to be called with sessions mutex held. |
e5382b6d | 560 | */ |
3c997079 MD |
561 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
562 | struct lttng_kernel_event *event_param, | |
563 | void *filter, | |
564 | const struct lttng_event_desc *event_desc, | |
565 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 566 | { |
3c997079 | 567 | struct lttng_session *session = chan->session; |
a90917c3 | 568 | struct lttng_event *event; |
3c997079 MD |
569 | const char *event_name; |
570 | struct hlist_head *head; | |
571 | size_t name_len; | |
572 | uint32_t hash; | |
3d084699 | 573 | int ret; |
4e3c1b9b | 574 | |
abc0446a | 575 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 576 | ret = -EMFILE; |
e5382b6d | 577 | goto full; |
abc0446a | 578 | } |
3c997079 MD |
579 | |
580 | switch (itype) { | |
581 | case LTTNG_KERNEL_TRACEPOINT: | |
582 | event_name = event_desc->name; | |
583 | break; | |
584 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 585 | case LTTNG_KERNEL_UPROBE: |
3c997079 MD |
586 | case LTTNG_KERNEL_KRETPROBE: |
587 | case LTTNG_KERNEL_FUNCTION: | |
588 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 589 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
590 | event_name = event_param->name; |
591 | break; | |
592 | default: | |
593 | WARN_ON_ONCE(1); | |
594 | ret = -EINVAL; | |
595 | goto type_error; | |
596 | } | |
597 | name_len = strlen(event_name); | |
598 | hash = jhash(event_name, name_len, 0); | |
599 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 600 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
601 | WARN_ON_ONCE(!event->desc); |
602 | if (!strncmp(event->desc->name, event_name, | |
603 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
604 | && chan == event->chan) { | |
605 | ret = -EEXIST; | |
606 | goto exist; | |
abc0446a MD |
607 | } |
608 | } | |
3c997079 | 609 | |
11b5a3c2 | 610 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 611 | if (!event) { |
4cf0bf51 | 612 | ret = -ENOMEM; |
4e3c1b9b | 613 | goto cache_error; |
abc0446a | 614 | } |
4e3c1b9b MD |
615 | event->chan = chan; |
616 | event->filter = filter; | |
e5382b6d | 617 | event->id = chan->free_event_id++; |
3c997079 MD |
618 | event->instrumentation = itype; |
619 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 620 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
621 | INIT_LIST_HEAD(&event->enablers_ref_head); |
622 | ||
623 | switch (itype) { | |
ab2277d6 | 624 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
625 | /* Event will be enabled by enabler sync. */ |
626 | event->enabled = 0; | |
627 | event->registered = 0; | |
628 | event->desc = lttng_event_get(event_name); | |
abc0446a | 629 | if (!event->desc) { |
4cf0bf51 | 630 | ret = -ENOENT; |
d3dbe23c | 631 | goto register_error; |
abc0446a | 632 | } |
3c997079 MD |
633 | /* Populate lttng_event structure before event registration. */ |
634 | smp_wmb(); | |
baf20995 | 635 | break; |
ab2277d6 | 636 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
637 | /* |
638 | * Needs to be explicitly enabled after creation, since | |
639 | * we may want to apply filters. | |
640 | */ | |
641 | event->enabled = 0; | |
3c997079 MD |
642 | event->registered = 1; |
643 | /* | |
644 | * Populate lttng_event structure before event | |
645 | * registration. | |
646 | */ | |
647 | smp_wmb(); | |
648 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
649 | event_param->u.kprobe.symbol_name, |
650 | event_param->u.kprobe.offset, | |
651 | event_param->u.kprobe.addr, | |
652 | event); | |
abc0446a | 653 | if (ret) { |
4cf0bf51 | 654 | ret = -EINVAL; |
d6d808f3 | 655 | goto register_error; |
abc0446a | 656 | } |
edeb3137 MD |
657 | ret = try_module_get(event->desc->owner); |
658 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 659 | break; |
7371f44c MD |
660 | case LTTNG_KERNEL_KRETPROBE: |
661 | { | |
a90917c3 | 662 | struct lttng_event *event_return; |
7371f44c MD |
663 | |
664 | /* kretprobe defines 2 events */ | |
a0493bef MD |
665 | /* |
666 | * Needs to be explicitly enabled after creation, since | |
667 | * we may want to apply filters. | |
668 | */ | |
669 | event->enabled = 0; | |
3c997079 | 670 | event->registered = 1; |
7371f44c MD |
671 | event_return = |
672 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 673 | if (!event_return) { |
4cf0bf51 | 674 | ret = -ENOMEM; |
7371f44c | 675 | goto register_error; |
abc0446a | 676 | } |
7371f44c MD |
677 | event_return->chan = chan; |
678 | event_return->filter = filter; | |
679 | event_return->id = chan->free_event_id++; | |
a0493bef | 680 | event_return->enabled = 0; |
3c997079 MD |
681 | event_return->registered = 1; |
682 | event_return->instrumentation = itype; | |
7371f44c | 683 | /* |
a90917c3 | 684 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
685 | */ |
686 | smp_wmb(); | |
3c997079 | 687 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
688 | event_param->u.kretprobe.symbol_name, |
689 | event_param->u.kretprobe.offset, | |
690 | event_param->u.kretprobe.addr, | |
691 | event, event_return); | |
692 | if (ret) { | |
693 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 694 | ret = -EINVAL; |
7371f44c MD |
695 | goto register_error; |
696 | } | |
697 | /* Take 2 refs on the module: one per event. */ | |
698 | ret = try_module_get(event->desc->owner); | |
699 | WARN_ON_ONCE(!ret); | |
700 | ret = try_module_get(event->desc->owner); | |
701 | WARN_ON_ONCE(!ret); | |
a90917c3 | 702 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 703 | event_return); |
abc0446a | 704 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
705 | if (ret) { |
706 | kmem_cache_free(event_cache, event_return); | |
707 | module_put(event->desc->owner); | |
708 | module_put(event->desc->owner); | |
709 | goto statedump_error; | |
710 | } | |
711 | list_add(&event_return->list, &chan->session->events); | |
712 | break; | |
713 | } | |
ab2277d6 | 714 | case LTTNG_KERNEL_FUNCTION: |
a0493bef MD |
715 | /* |
716 | * Needs to be explicitly enabled after creation, since | |
717 | * we may want to apply filters. | |
718 | */ | |
719 | event->enabled = 0; | |
3c997079 MD |
720 | event->registered = 1; |
721 | /* | |
722 | * Populate lttng_event structure before event | |
723 | * registration. | |
724 | */ | |
725 | smp_wmb(); | |
726 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
727 | event_param->u.ftrace.symbol_name, |
728 | event); | |
abc0446a | 729 | if (ret) { |
e0a7a7c4 | 730 | goto register_error; |
abc0446a | 731 | } |
edeb3137 MD |
732 | ret = try_module_get(event->desc->owner); |
733 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 734 | break; |
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; | |
baf20995 MD |
771 | default: |
772 | WARN_ON_ONCE(1); | |
4cf0bf51 | 773 | ret = -EINVAL; |
df07930b | 774 | goto register_error; |
baf20995 | 775 | } |
a90917c3 | 776 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
777 | WARN_ON_ONCE(ret > 0); |
778 | if (ret) { | |
c099397a | 779 | goto statedump_error; |
abc0446a | 780 | } |
3c997079 | 781 | hlist_add_head(&event->hlist, head); |
dda6a249 | 782 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
783 | return event; |
784 | ||
c099397a | 785 | statedump_error: |
259b6cb3 | 786 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 787 | register_error: |
11b5a3c2 | 788 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
789 | cache_error: |
790 | exist: | |
3c997079 | 791 | type_error: |
e5382b6d | 792 | full: |
4cf0bf51 | 793 | return ERR_PTR(ret); |
4e3c1b9b MD |
794 | } |
795 | ||
3c997079 MD |
796 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
797 | struct lttng_kernel_event *event_param, | |
798 | void *filter, | |
799 | const struct lttng_event_desc *event_desc, | |
800 | enum lttng_kernel_instrumentation itype) | |
801 | { | |
802 | struct lttng_event *event; | |
803 | ||
804 | mutex_lock(&sessions_mutex); | |
805 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
806 | itype); | |
807 | mutex_unlock(&sessions_mutex); | |
808 | return event; | |
809 | } | |
810 | ||
811 | /* Only used for tracepoints for now. */ | |
812 | static | |
813 | void register_event(struct lttng_event *event) | |
814 | { | |
815 | const struct lttng_event_desc *desc; | |
f127e61e | 816 | int ret = -EINVAL; |
3c997079 | 817 | |
3c997079 MD |
818 | if (event->registered) |
819 | return; | |
4ecb5ad5 | 820 | |
3c997079 | 821 | desc = event->desc; |
4ecb5ad5 MD |
822 | switch (event->instrumentation) { |
823 | case LTTNG_KERNEL_TRACEPOINT: | |
824 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
825 | desc->probe_callback, | |
826 | event); | |
827 | break; | |
828 | case LTTNG_KERNEL_SYSCALL: | |
829 | ret = lttng_syscall_filter_enable(event->chan, | |
830 | desc->name); | |
831 | break; | |
832 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 833 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 MD |
834 | case LTTNG_KERNEL_KRETPROBE: |
835 | case LTTNG_KERNEL_FUNCTION: | |
836 | case LTTNG_KERNEL_NOOP: | |
837 | ret = 0; | |
838 | break; | |
839 | default: | |
840 | WARN_ON_ONCE(1); | |
841 | } | |
3c997079 MD |
842 | if (!ret) |
843 | event->registered = 1; | |
844 | } | |
845 | ||
4e3c1b9b MD |
846 | /* |
847 | * Only used internally at session destruction. | |
848 | */ | |
a90917c3 | 849 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 850 | { |
4ecb5ad5 | 851 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
852 | int ret = -EINVAL; |
853 | ||
3c997079 MD |
854 | if (!event->registered) |
855 | return 0; | |
856 | ||
4ecb5ad5 | 857 | desc = event->desc; |
38d024ae | 858 | switch (event->instrumentation) { |
ab2277d6 | 859 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 860 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 861 | event->desc->probe_callback, |
11b5a3c2 | 862 | event); |
baf20995 | 863 | break; |
ab2277d6 | 864 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 865 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
866 | ret = 0; |
867 | break; | |
7371f44c MD |
868 | case LTTNG_KERNEL_KRETPROBE: |
869 | lttng_kretprobes_unregister(event); | |
870 | ret = 0; | |
871 | break; | |
ab2277d6 | 872 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
873 | lttng_ftrace_unregister(event); |
874 | ret = 0; | |
875 | break; | |
33a39a3c | 876 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
877 | ret = lttng_syscall_filter_disable(event->chan, |
878 | desc->name); | |
879 | break; | |
880 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
881 | ret = 0; |
882 | break; | |
149b9a9d YB |
883 | case LTTNG_KERNEL_UPROBE: |
884 | lttng_uprobes_unregister(event); | |
885 | ret = 0; | |
886 | break; | |
baf20995 MD |
887 | default: |
888 | WARN_ON_ONCE(1); | |
889 | } | |
3c997079 MD |
890 | if (!ret) |
891 | event->registered = 0; | |
dda6a249 MD |
892 | return ret; |
893 | } | |
894 | ||
895 | /* | |
896 | * Only used internally at session destruction. | |
897 | */ | |
be066e6c | 898 | static |
a90917c3 | 899 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 900 | { |
edeb3137 MD |
901 | switch (event->instrumentation) { |
902 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 903 | lttng_event_put(event->desc); |
edeb3137 MD |
904 | break; |
905 | case LTTNG_KERNEL_KPROBE: | |
906 | module_put(event->desc->owner); | |
907 | lttng_kprobes_destroy_private(event); | |
908 | break; | |
7371f44c MD |
909 | case LTTNG_KERNEL_KRETPROBE: |
910 | module_put(event->desc->owner); | |
911 | lttng_kretprobes_destroy_private(event); | |
912 | break; | |
edeb3137 MD |
913 | case LTTNG_KERNEL_FUNCTION: |
914 | module_put(event->desc->owner); | |
915 | lttng_ftrace_destroy_private(event); | |
916 | break; | |
259b6cb3 | 917 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 918 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 919 | break; |
149b9a9d YB |
920 | case LTTNG_KERNEL_UPROBE: |
921 | module_put(event->desc->owner); | |
922 | lttng_uprobes_destroy_private(event); | |
923 | break; | |
edeb3137 MD |
924 | default: |
925 | WARN_ON_ONCE(1); | |
926 | } | |
dda6a249 | 927 | list_del(&event->list); |
8070f5c0 | 928 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 929 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
930 | } |
931 | ||
e0130fab MD |
932 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
933 | { | |
934 | int ret; | |
935 | ||
936 | if (pid < -1) | |
937 | return -EINVAL; | |
938 | mutex_lock(&sessions_mutex); | |
939 | if (pid == -1) { | |
940 | /* track all pids: destroy tracker. */ | |
941 | if (session->pid_tracker) { | |
942 | struct lttng_pid_tracker *lpf; | |
943 | ||
944 | lpf = session->pid_tracker; | |
945 | rcu_assign_pointer(session->pid_tracker, NULL); | |
946 | synchronize_trace(); | |
947 | lttng_pid_tracker_destroy(lpf); | |
948 | } | |
949 | ret = 0; | |
950 | } else { | |
951 | if (!session->pid_tracker) { | |
952 | struct lttng_pid_tracker *lpf; | |
953 | ||
954 | lpf = lttng_pid_tracker_create(); | |
955 | if (!lpf) { | |
956 | ret = -ENOMEM; | |
957 | goto unlock; | |
958 | } | |
959 | ret = lttng_pid_tracker_add(lpf, pid); | |
960 | rcu_assign_pointer(session->pid_tracker, lpf); | |
961 | } else { | |
962 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
963 | } | |
964 | } | |
965 | unlock: | |
966 | mutex_unlock(&sessions_mutex); | |
967 | return ret; | |
968 | } | |
969 | ||
970 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
971 | { | |
972 | int ret; | |
973 | ||
974 | if (pid < -1) | |
975 | return -EINVAL; | |
976 | mutex_lock(&sessions_mutex); | |
977 | if (pid == -1) { | |
978 | /* untrack all pids: replace by empty tracker. */ | |
979 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
980 | struct lttng_pid_tracker *lpf; | |
981 | ||
982 | lpf = lttng_pid_tracker_create(); | |
983 | if (!lpf) { | |
984 | ret = -ENOMEM; | |
985 | goto unlock; | |
986 | } | |
987 | rcu_assign_pointer(session->pid_tracker, lpf); | |
988 | synchronize_trace(); | |
989 | if (old_lpf) | |
990 | lttng_pid_tracker_destroy(old_lpf); | |
991 | ret = 0; | |
992 | } else { | |
993 | if (!session->pid_tracker) { | |
994 | ret = -ENOENT; | |
995 | goto unlock; | |
996 | } | |
997 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
998 | } | |
999 | unlock: | |
1000 | mutex_unlock(&sessions_mutex); | |
1001 | return ret; | |
1002 | } | |
1003 | ||
7e6f9ef6 MD |
1004 | static |
1005 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
1006 | { | |
1007 | struct lttng_session *session = m->private; | |
1008 | struct lttng_pid_tracker *lpf; | |
1009 | struct lttng_pid_hash_node *e; | |
1010 | int iter = 0, i; | |
1011 | ||
1012 | mutex_lock(&sessions_mutex); | |
1013 | lpf = session->pid_tracker; | |
1014 | if (lpf) { | |
1015 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1016 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1017 | ||
f934e302 | 1018 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1019 | if (iter++ >= *pos) |
1020 | return e; | |
1021 | } | |
1022 | } | |
1023 | } else { | |
1024 | /* PID tracker disabled. */ | |
1025 | if (iter >= *pos && iter == 0) { | |
1026 | return session; /* empty tracker */ | |
1027 | } | |
1028 | iter++; | |
1029 | } | |
1030 | /* End of list */ | |
1031 | return NULL; | |
1032 | } | |
1033 | ||
1034 | /* Called with sessions_mutex held. */ | |
1035 | static | |
1036 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1037 | { | |
1038 | struct lttng_session *session = m->private; | |
1039 | struct lttng_pid_tracker *lpf; | |
1040 | struct lttng_pid_hash_node *e; | |
1041 | int iter = 0, i; | |
1042 | ||
1043 | (*ppos)++; | |
1044 | lpf = session->pid_tracker; | |
1045 | if (lpf) { | |
1046 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1047 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1048 | ||
f934e302 | 1049 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1050 | if (iter++ >= *ppos) |
1051 | return e; | |
1052 | } | |
1053 | } | |
1054 | } else { | |
1055 | /* PID tracker disabled. */ | |
1056 | if (iter >= *ppos && iter == 0) | |
1057 | return session; /* empty tracker */ | |
1058 | iter++; | |
1059 | } | |
1060 | ||
1061 | /* End of list */ | |
1062 | return NULL; | |
1063 | } | |
1064 | ||
1065 | static | |
1066 | void pid_list_stop(struct seq_file *m, void *p) | |
1067 | { | |
1068 | mutex_unlock(&sessions_mutex); | |
1069 | } | |
1070 | ||
1071 | static | |
1072 | int pid_list_show(struct seq_file *m, void *p) | |
1073 | { | |
1074 | int pid; | |
1075 | ||
1076 | if (p == m->private) { | |
1077 | /* Tracker disabled. */ | |
1078 | pid = -1; | |
1079 | } else { | |
1080 | const struct lttng_pid_hash_node *e = p; | |
1081 | ||
1082 | pid = lttng_pid_tracker_get_node_pid(e); | |
1083 | } | |
1084 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1085 | return 0; | |
1086 | } | |
1087 | ||
1088 | static | |
1089 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1090 | .start = pid_list_start, | |
1091 | .next = pid_list_next, | |
1092 | .stop = pid_list_stop, | |
1093 | .show = pid_list_show, | |
1094 | }; | |
1095 | ||
1096 | static | |
1097 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1098 | { | |
1099 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1100 | } | |
1101 | ||
1102 | static | |
1103 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1104 | { | |
1105 | struct seq_file *m = file->private_data; | |
1106 | struct lttng_session *session = m->private; | |
1107 | int ret; | |
1108 | ||
1109 | WARN_ON_ONCE(!session); | |
1110 | ret = seq_release(inode, file); | |
1111 | if (!ret && session) | |
1112 | fput(session->file); | |
1113 | return ret; | |
1114 | } | |
1115 | ||
1116 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1117 | .owner = THIS_MODULE, | |
1118 | .open = lttng_tracker_pids_list_open, | |
1119 | .read = seq_read, | |
1120 | .llseek = seq_lseek, | |
1121 | .release = lttng_tracker_pids_list_release, | |
1122 | }; | |
1123 | ||
1124 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1125 | { | |
1126 | struct file *tracker_pids_list_file; | |
1127 | struct seq_file *m; | |
1128 | int file_fd, ret; | |
1129 | ||
1130 | file_fd = lttng_get_unused_fd(); | |
1131 | if (file_fd < 0) { | |
1132 | ret = file_fd; | |
1133 | goto fd_error; | |
1134 | } | |
1135 | ||
1136 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1137 | <tng_tracker_pids_list_fops, | |
1138 | NULL, O_RDWR); | |
1139 | if (IS_ERR(tracker_pids_list_file)) { | |
1140 | ret = PTR_ERR(tracker_pids_list_file); | |
1141 | goto file_error; | |
1142 | } | |
98d7281c MJ |
1143 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1144 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1145 | goto refcount_error; |
1146 | } | |
7e6f9ef6 MD |
1147 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1148 | if (ret < 0) | |
1149 | goto open_error; | |
1150 | m = tracker_pids_list_file->private_data; | |
1151 | m->private = session; | |
1152 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1153 | |
1154 | return file_fd; | |
1155 | ||
1156 | open_error: | |
9c1f4643 MD |
1157 | atomic_long_dec(&session->file->f_count); |
1158 | refcount_error: | |
7e6f9ef6 MD |
1159 | fput(tracker_pids_list_file); |
1160 | file_error: | |
1161 | put_unused_fd(file_fd); | |
1162 | fd_error: | |
1163 | return ret; | |
1164 | } | |
1165 | ||
3c997079 MD |
1166 | /* |
1167 | * Enabler management. | |
1168 | */ | |
1169 | static | |
4993071a PP |
1170 | int lttng_match_enabler_star_glob(const char *desc_name, |
1171 | const char *pattern) | |
3c997079 | 1172 | { |
cbc19040 MD |
1173 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1174 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1175 | return 0; |
1176 | return 1; | |
1177 | } | |
1178 | ||
1179 | static | |
4ecb5ad5 MD |
1180 | int lttng_match_enabler_name(const char *desc_name, |
1181 | const char *name) | |
3c997079 | 1182 | { |
4ecb5ad5 | 1183 | if (strcmp(desc_name, name)) |
3c997079 MD |
1184 | return 0; |
1185 | return 1; | |
1186 | } | |
1187 | ||
1188 | static | |
1189 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1190 | struct lttng_enabler *enabler) | |
1191 | { | |
4ecb5ad5 MD |
1192 | const char *desc_name, *enabler_name; |
1193 | ||
1194 | enabler_name = enabler->event_param.name; | |
1195 | switch (enabler->event_param.instrumentation) { | |
1196 | case LTTNG_KERNEL_TRACEPOINT: | |
1197 | desc_name = desc->name; | |
1198 | break; | |
1199 | case LTTNG_KERNEL_SYSCALL: | |
1200 | desc_name = desc->name; | |
1201 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1202 | desc_name += strlen("compat_"); | |
1203 | if (!strncmp(desc_name, "syscall_exit_", | |
1204 | strlen("syscall_exit_"))) { | |
1205 | desc_name += strlen("syscall_exit_"); | |
1206 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1207 | strlen("syscall_entry_"))) { | |
1208 | desc_name += strlen("syscall_entry_"); | |
1209 | } else { | |
1210 | WARN_ON_ONCE(1); | |
1211 | return -EINVAL; | |
1212 | } | |
1213 | break; | |
1214 | default: | |
1215 | WARN_ON_ONCE(1); | |
1216 | return -EINVAL; | |
1217 | } | |
3c997079 | 1218 | switch (enabler->type) { |
4993071a PP |
1219 | case LTTNG_ENABLER_STAR_GLOB: |
1220 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
3c997079 | 1221 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1222 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1223 | default: |
1224 | return -EINVAL; | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | static | |
1229 | int lttng_event_match_enabler(struct lttng_event *event, | |
1230 | struct lttng_enabler *enabler) | |
1231 | { | |
33a39a3c MD |
1232 | if (enabler->event_param.instrumentation != event->instrumentation) |
1233 | return 0; | |
3c997079 MD |
1234 | if (lttng_desc_match_enabler(event->desc, enabler) |
1235 | && event->chan == enabler->chan) | |
1236 | return 1; | |
1237 | else | |
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | static | |
1242 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1243 | struct lttng_enabler *enabler) | |
1244 | { | |
1245 | struct lttng_enabler_ref *enabler_ref; | |
1246 | ||
1247 | list_for_each_entry(enabler_ref, | |
1248 | &event->enablers_ref_head, node) { | |
1249 | if (enabler_ref->ref == enabler) | |
1250 | return enabler_ref; | |
1251 | } | |
1252 | return NULL; | |
1253 | } | |
1254 | ||
3c997079 | 1255 | static |
33a39a3c | 1256 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1257 | { |
1258 | struct lttng_session *session = enabler->chan->session; | |
1259 | struct lttng_probe_desc *probe_desc; | |
1260 | const struct lttng_event_desc *desc; | |
1261 | int i; | |
1262 | struct list_head *probe_list; | |
1263 | ||
1264 | probe_list = lttng_get_probe_list_head(); | |
1265 | /* | |
1266 | * For each probe event, if we find that a probe event matches | |
1267 | * our enabler, create an associated lttng_event if not | |
1268 | * already present. | |
1269 | */ | |
1270 | list_for_each_entry(probe_desc, probe_list, head) { | |
1271 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1272 | int found = 0; | |
1273 | struct hlist_head *head; | |
1274 | const char *event_name; | |
1275 | size_t name_len; | |
1276 | uint32_t hash; | |
1277 | struct lttng_event *event; | |
1278 | ||
1279 | desc = probe_desc->event_desc[i]; | |
1280 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1281 | continue; | |
1282 | event_name = desc->name; | |
1283 | name_len = strlen(event_name); | |
1284 | ||
1285 | /* | |
1286 | * Check if already created. | |
1287 | */ | |
1288 | hash = jhash(event_name, name_len, 0); | |
1289 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1290 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1291 | if (event->desc == desc |
1292 | && event->chan == enabler->chan) | |
1293 | found = 1; | |
1294 | } | |
1295 | if (found) | |
1296 | continue; | |
1297 | ||
1298 | /* | |
1299 | * We need to create an event for this | |
1300 | * event probe. | |
1301 | */ | |
1302 | event = _lttng_event_create(enabler->chan, | |
1303 | NULL, NULL, desc, | |
1304 | LTTNG_KERNEL_TRACEPOINT); | |
1305 | if (!event) { | |
1306 | printk(KERN_INFO "Unable to create event %s\n", | |
1307 | probe_desc->event_desc[i]->name); | |
1308 | } | |
1309 | } | |
1310 | } | |
1311 | } | |
1312 | ||
33a39a3c MD |
1313 | static |
1314 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1315 | { | |
1316 | int ret; | |
1317 | ||
1318 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1319 | WARN_ON_ONCE(ret); | |
1320 | } | |
1321 | ||
1322 | /* | |
1323 | * Create struct lttng_event if it is missing and present in the list of | |
1324 | * tracepoint probes. | |
1325 | * Should be called with sessions mutex held. | |
1326 | */ | |
1327 | static | |
1328 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1329 | { | |
1330 | switch (enabler->event_param.instrumentation) { | |
1331 | case LTTNG_KERNEL_TRACEPOINT: | |
1332 | lttng_create_tracepoint_if_missing(enabler); | |
1333 | break; | |
1334 | case LTTNG_KERNEL_SYSCALL: | |
1335 | lttng_create_syscall_if_missing(enabler); | |
1336 | break; | |
1337 | default: | |
1338 | WARN_ON_ONCE(1); | |
1339 | break; | |
1340 | } | |
1341 | } | |
1342 | ||
3c997079 MD |
1343 | /* |
1344 | * Create events associated with an enabler (if not already present), | |
1345 | * and add backward reference from the event to the enabler. | |
1346 | * Should be called with sessions mutex held. | |
1347 | */ | |
1348 | static | |
1349 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1350 | { | |
1351 | struct lttng_session *session = enabler->chan->session; | |
1352 | struct lttng_event *event; | |
1353 | ||
1354 | /* First ensure that probe events are created for this enabler. */ | |
1355 | lttng_create_event_if_missing(enabler); | |
1356 | ||
1357 | /* For each event matching enabler in session event list. */ | |
1358 | list_for_each_entry(event, &session->events, list) { | |
1359 | struct lttng_enabler_ref *enabler_ref; | |
1360 | ||
1361 | if (!lttng_event_match_enabler(event, enabler)) | |
1362 | continue; | |
1363 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1364 | if (!enabler_ref) { | |
1365 | /* | |
1366 | * If no backward ref, create it. | |
1367 | * Add backward ref from event to enabler. | |
1368 | */ | |
1369 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1370 | if (!enabler_ref) | |
1371 | return -ENOMEM; | |
1372 | enabler_ref->ref = enabler; | |
1373 | list_add(&enabler_ref->node, | |
1374 | &event->enablers_ref_head); | |
1375 | } | |
1376 | ||
f127e61e MD |
1377 | /* |
1378 | * Link filter bytecodes if not linked yet. | |
1379 | */ | |
1380 | lttng_enabler_event_link_bytecode(event, enabler); | |
1381 | ||
3c997079 MD |
1382 | /* TODO: merge event context. */ |
1383 | } | |
1384 | return 0; | |
1385 | } | |
1386 | ||
1387 | /* | |
1388 | * Called at module load: connect the probe on all enablers matching | |
1389 | * this event. | |
1390 | * Called with sessions lock held. | |
1391 | */ | |
1392 | int lttng_fix_pending_events(void) | |
1393 | { | |
1394 | struct lttng_session *session; | |
1395 | ||
1396 | list_for_each_entry(session, &sessions, list) | |
1397 | lttng_session_lazy_sync_enablers(session); | |
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1402 | struct lttng_kernel_event *event_param, | |
1403 | struct lttng_channel *chan) | |
1404 | { | |
1405 | struct lttng_enabler *enabler; | |
1406 | ||
1407 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1408 | if (!enabler) | |
1409 | return NULL; | |
1410 | enabler->type = type; | |
07dfc1d0 | 1411 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1412 | memcpy(&enabler->event_param, event_param, |
1413 | sizeof(enabler->event_param)); | |
1414 | enabler->chan = chan; | |
1415 | /* ctx left NULL */ | |
4fd19d8a | 1416 | enabler->enabled = 0; |
3c997079 MD |
1417 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1418 | mutex_lock(&sessions_mutex); | |
1419 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1420 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1421 | mutex_unlock(&sessions_mutex); | |
1422 | return enabler; | |
1423 | } | |
1424 | ||
1425 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1426 | { | |
1427 | mutex_lock(&sessions_mutex); | |
1428 | enabler->enabled = 1; | |
1429 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1430 | mutex_unlock(&sessions_mutex); | |
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1435 | { | |
1436 | mutex_lock(&sessions_mutex); | |
1437 | enabler->enabled = 0; | |
1438 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1439 | mutex_unlock(&sessions_mutex); | |
1440 | return 0; | |
1441 | } | |
1442 | ||
07dfc1d0 MD |
1443 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1444 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1445 | { | |
1446 | struct lttng_filter_bytecode_node *bytecode_node; | |
1447 | uint32_t bytecode_len; | |
1448 | int ret; | |
1449 | ||
1450 | ret = get_user(bytecode_len, &bytecode->len); | |
1451 | if (ret) | |
1452 | return ret; | |
1453 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1454 | GFP_KERNEL); | |
1455 | if (!bytecode_node) | |
1456 | return -ENOMEM; | |
1457 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1458 | sizeof(*bytecode) + bytecode_len); | |
1459 | if (ret) | |
1460 | goto error_free; | |
1461 | bytecode_node->enabler = enabler; | |
1462 | /* Enforce length based on allocated size */ | |
1463 | bytecode_node->bc.len = bytecode_len; | |
1464 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1465 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1466 | return 0; | |
1467 | ||
1468 | error_free: | |
1469 | kfree(bytecode_node); | |
1470 | return ret; | |
1471 | } | |
1472 | ||
3aed4dca FD |
1473 | int lttng_event_add_callsite(struct lttng_event *event, |
1474 | struct lttng_kernel_event_callsite __user *callsite) | |
1475 | { | |
1476 | ||
1477 | switch (event->instrumentation) { | |
1478 | case LTTNG_KERNEL_UPROBE: | |
1479 | return lttng_uprobes_add_callsite(event, callsite); | |
1480 | default: | |
1481 | return -EINVAL; | |
1482 | } | |
1483 | } | |
1484 | ||
3c997079 MD |
1485 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1486 | struct lttng_kernel_context *context_param) | |
1487 | { | |
1488 | return -ENOSYS; | |
1489 | } | |
1490 | ||
1491 | static | |
1492 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1493 | { | |
07dfc1d0 MD |
1494 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1495 | ||
1496 | /* Destroy filter bytecode */ | |
1497 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1498 | &enabler->filter_bytecode_head, node) { | |
1499 | kfree(filter_node); | |
1500 | } | |
1501 | ||
3c997079 MD |
1502 | /* Destroy contexts */ |
1503 | lttng_destroy_context(enabler->ctx); | |
1504 | ||
1505 | list_del(&enabler->node); | |
1506 | kfree(enabler); | |
1507 | } | |
1508 | ||
1509 | /* | |
1510 | * lttng_session_sync_enablers should be called just before starting a | |
1511 | * session. | |
1512 | * Should be called with sessions mutex held. | |
1513 | */ | |
1514 | static | |
1515 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1516 | { | |
1517 | struct lttng_enabler *enabler; | |
1518 | struct lttng_event *event; | |
1519 | ||
1520 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1521 | lttng_enabler_ref_events(enabler); | |
1522 | /* | |
1523 | * For each event, if at least one of its enablers is enabled, | |
1524 | * and its channel and session transient states are enabled, we | |
1525 | * enable the event, else we disable it. | |
1526 | */ | |
1527 | list_for_each_entry(event, &session->events, list) { | |
1528 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1529 | struct lttng_bytecode_runtime *runtime; |
1530 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1531 | |
4ecb5ad5 MD |
1532 | switch (event->instrumentation) { |
1533 | case LTTNG_KERNEL_TRACEPOINT: | |
1534 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1535 | /* Enable events */ |
1536 | list_for_each_entry(enabler_ref, | |
1537 | &event->enablers_ref_head, node) { | |
1538 | if (enabler_ref->ref->enabled) { | |
1539 | enabled = 1; | |
1540 | break; | |
1541 | } | |
1542 | } | |
4ecb5ad5 MD |
1543 | break; |
1544 | default: | |
3c997079 MD |
1545 | /* Not handled with lazy sync. */ |
1546 | continue; | |
1547 | } | |
1548 | /* | |
1549 | * Enabled state is based on union of enablers, with | |
1550 | * intesection of session and channel transient enable | |
1551 | * states. | |
1552 | */ | |
1553 | enabled = enabled && session->tstate && event->chan->tstate; | |
1554 | ||
a8f2d0c7 | 1555 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1556 | /* |
1557 | * Sync tracepoint registration with event enabled | |
1558 | * state. | |
1559 | */ | |
1560 | if (enabled) { | |
1561 | register_event(event); | |
1562 | } else { | |
1563 | _lttng_event_unregister(event); | |
1564 | } | |
07dfc1d0 MD |
1565 | |
1566 | /* Check if has enablers without bytecode enabled */ | |
1567 | list_for_each_entry(enabler_ref, | |
1568 | &event->enablers_ref_head, node) { | |
1569 | if (enabler_ref->ref->enabled | |
1570 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1571 | has_enablers_without_bytecode = 1; | |
1572 | break; | |
1573 | } | |
1574 | } | |
1575 | event->has_enablers_without_bytecode = | |
1576 | has_enablers_without_bytecode; | |
1577 | ||
1578 | /* Enable filters */ | |
1579 | list_for_each_entry(runtime, | |
f127e61e | 1580 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1581 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1582 | } |
1583 | } | |
1584 | ||
1585 | /* | |
1586 | * Apply enablers to session events, adding events to session if need | |
1587 | * be. It is required after each modification applied to an active | |
1588 | * session, and right before session "start". | |
1589 | * "lazy" sync means we only sync if required. | |
1590 | * Should be called with sessions mutex held. | |
1591 | */ | |
1592 | static | |
1593 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1594 | { | |
1595 | /* We can skip if session is not active */ | |
1596 | if (!session->active) | |
1597 | return; | |
1598 | lttng_session_sync_enablers(session); | |
1599 | } | |
1600 | ||
1ec3f75a | 1601 | /* |
d83004aa JD |
1602 | * Serialize at most one packet worth of metadata into a metadata |
1603 | * channel. | |
92d9f5e6 MD |
1604 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1605 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1606 | * allows us to do racy operations such as looking for remaining space left in | |
1607 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1608 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1609 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1610 | * Returns the number of bytes written in the channel, 0 if no data |
1611 | * was written and a negative value on error. | |
1ec3f75a | 1612 | */ |
b3b8072b MD |
1613 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1614 | struct channel *chan) | |
d83004aa JD |
1615 | { |
1616 | struct lib_ring_buffer_ctx ctx; | |
1617 | int ret = 0; | |
1618 | size_t len, reserve_len; | |
1619 | ||
f613e3e6 | 1620 | /* |
92d9f5e6 MD |
1621 | * Ensure we support mutiple get_next / put sequences followed by |
1622 | * put_next. The metadata cache lock protects reading the metadata | |
1623 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1624 | * "flush" operations on the buffer invoked by different processes. | |
1625 | * Moreover, since the metadata cache memory can be reallocated, we | |
1626 | * need to have exclusive access against updates even though we only | |
1627 | * read it. | |
f613e3e6 | 1628 | */ |
92d9f5e6 | 1629 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1630 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1631 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1632 | goto end; |
f613e3e6 | 1633 | |
9616f0bf JD |
1634 | /* Metadata regenerated, change the version. */ |
1635 | if (stream->metadata_cache->version != stream->version) | |
1636 | stream->version = stream->metadata_cache->version; | |
1637 | ||
d83004aa | 1638 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1639 | stream->metadata_in; |
9de2c215 | 1640 | if (!len) |
de23d59d | 1641 | goto end; |
d83004aa | 1642 | reserve_len = min_t(size_t, |
b3b8072b | 1643 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1644 | len); |
b3b8072b | 1645 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1646 | sizeof(char), -1); |
1647 | /* | |
1648 | * If reservation failed, return an error to the caller. | |
1649 | */ | |
b3b8072b | 1650 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1651 | if (ret != 0) { |
1652 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1653 | goto end; | |
1654 | } | |
b3b8072b | 1655 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1656 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1657 | reserve_len); |
b3b8072b | 1658 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1659 | stream->metadata_in += reserve_len; |
d83004aa JD |
1660 | ret = reserve_len; |
1661 | ||
1662 | end: | |
92d9f5e6 | 1663 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1664 | return ret; |
1665 | } | |
1666 | ||
1667 | /* | |
1668 | * Write the metadata to the metadata cache. | |
1669 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1670 | * The metadata cache lock protects us from concurrent read access from |
1671 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1672 | */ |
a90917c3 | 1673 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1674 | const char *fmt, ...) |
1675 | { | |
c099397a | 1676 | char *str; |
d83004aa | 1677 | size_t len; |
c099397a | 1678 | va_list ap; |
d83004aa | 1679 | struct lttng_metadata_stream *stream; |
c099397a | 1680 | |
a8f2d0c7 | 1681 | WARN_ON_ONCE(!READ_ONCE(session->active)); |
c099397a MD |
1682 | |
1683 | va_start(ap, fmt); | |
1684 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1685 | va_end(ap); | |
1686 | if (!str) | |
1687 | return -ENOMEM; | |
1688 | ||
1ec3f75a | 1689 | len = strlen(str); |
92d9f5e6 | 1690 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1691 | if (session->metadata_cache->metadata_written + len > |
1692 | session->metadata_cache->cache_alloc) { | |
1693 | char *tmp_cache_realloc; | |
1694 | unsigned int tmp_cache_alloc_size; | |
1695 | ||
1696 | tmp_cache_alloc_size = max_t(unsigned int, | |
1697 | session->metadata_cache->cache_alloc + len, | |
1698 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 1699 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1700 | if (!tmp_cache_realloc) |
1701 | goto err; | |
a606b6e8 ML |
1702 | if (session->metadata_cache->data) { |
1703 | memcpy(tmp_cache_realloc, | |
1704 | session->metadata_cache->data, | |
1705 | session->metadata_cache->cache_alloc); | |
1706 | vfree(session->metadata_cache->data); | |
1707 | } | |
1708 | ||
d83004aa JD |
1709 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1710 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1711 | } |
d83004aa JD |
1712 | memcpy(session->metadata_cache->data + |
1713 | session->metadata_cache->metadata_written, | |
1714 | str, len); | |
1715 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1716 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1717 | kfree(str); |
d83004aa JD |
1718 | |
1719 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1720 | wake_up_interruptible(&stream->read_wait); | |
1721 | ||
1722 | return 0; | |
1723 | ||
1724 | err: | |
92d9f5e6 | 1725 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1726 | kfree(str); |
1727 | return -ENOMEM; | |
c099397a MD |
1728 | } |
1729 | ||
f513b2bf MD |
1730 | static |
1731 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1732 | { | |
1733 | size_t i; | |
1734 | ||
1735 | for (i = 0; i < nesting; i++) { | |
1736 | int ret; | |
1737 | ||
1738 | ret = lttng_metadata_printf(session, " "); | |
1739 | if (ret) { | |
1740 | return ret; | |
1741 | } | |
1742 | } | |
1743 | return 0; | |
1744 | } | |
1745 | ||
1746 | /* | |
1747 | * Must be called with sessions_mutex held. | |
1748 | */ | |
1749 | static | |
1750 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1751 | const struct lttng_type *type, | |
1752 | size_t nesting) | |
1753 | { | |
1754 | int ret; | |
1755 | uint32_t i, nr_fields; | |
1756 | ||
1757 | ret = print_tabs(session, nesting); | |
1758 | if (ret) | |
1759 | return ret; | |
1760 | ret = lttng_metadata_printf(session, | |
1761 | "struct {\n"); | |
1762 | if (ret) | |
1763 | return ret; | |
1764 | nr_fields = type->u._struct.nr_fields; | |
1765 | for (i = 0; i < nr_fields; i++) { | |
1766 | const struct lttng_event_field *iter_field; | |
1767 | ||
1768 | iter_field = &type->u._struct.fields[i]; | |
1769 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1770 | if (ret) | |
1771 | return ret; | |
1772 | } | |
1773 | ret = print_tabs(session, nesting); | |
1774 | if (ret) | |
1775 | return ret; | |
1776 | ret = lttng_metadata_printf(session, | |
1777 | "}"); | |
1778 | return ret; | |
1779 | } | |
1780 | ||
1781 | /* | |
1782 | * Must be called with sessions_mutex held. | |
1783 | */ | |
1784 | static | |
1785 | int _lttng_struct_statedump(struct lttng_session *session, | |
1786 | const struct lttng_event_field *field, | |
1787 | size_t nesting) | |
1788 | { | |
1789 | int ret; | |
1790 | ||
1791 | ret = _lttng_struct_type_statedump(session, | |
1792 | &field->type, nesting); | |
1793 | if (ret) | |
1794 | return ret; | |
1795 | ret = lttng_metadata_printf(session, | |
1796 | "_%s;\n", | |
1797 | field->name); | |
1798 | return ret; | |
1799 | } | |
1800 | ||
65c85aa6 MD |
1801 | /* |
1802 | * Must be called with sessions_mutex held. | |
1803 | */ | |
1804 | static | |
1805 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1806 | const struct lttng_type *type, | |
1807 | size_t nesting) | |
1808 | { | |
1809 | int ret; | |
1810 | uint32_t i, nr_choices; | |
1811 | ||
1812 | ret = print_tabs(session, nesting); | |
1813 | if (ret) | |
1814 | return ret; | |
1815 | ret = lttng_metadata_printf(session, | |
1816 | "variant <_%s> {\n", | |
1817 | type->u.variant.tag_name); | |
1818 | if (ret) | |
1819 | return ret; | |
1820 | nr_choices = type->u.variant.nr_choices; | |
1821 | for (i = 0; i < nr_choices; i++) { | |
1822 | const struct lttng_event_field *iter_field; | |
1823 | ||
1824 | iter_field = &type->u.variant.choices[i]; | |
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; | |
1832 | ret = lttng_metadata_printf(session, | |
1833 | "}"); | |
1834 | return ret; | |
1835 | } | |
1836 | ||
1837 | /* | |
1838 | * Must be called with sessions_mutex held. | |
1839 | */ | |
1840 | static | |
1841 | int _lttng_variant_statedump(struct lttng_session *session, | |
1842 | const struct lttng_event_field *field, | |
1843 | size_t nesting) | |
1844 | { | |
1845 | int ret; | |
1846 | ||
1847 | ret = _lttng_variant_type_statedump(session, | |
1848 | &field->type, nesting); | |
1849 | if (ret) | |
1850 | return ret; | |
1851 | ret = lttng_metadata_printf(session, | |
1852 | "_%s;\n", | |
1853 | field->name); | |
1854 | return ret; | |
1855 | } | |
1856 | ||
f513b2bf MD |
1857 | /* |
1858 | * Must be called with sessions_mutex held. | |
1859 | */ | |
1860 | static | |
1861 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
1862 | const struct lttng_event_field *field, | |
1863 | size_t nesting) | |
1864 | { | |
1865 | int ret; | |
1866 | const struct lttng_type *elem_type; | |
1867 | ||
65c85aa6 | 1868 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1869 | elem_type = field->type.u.array_compound.elem_type; |
1870 | switch (elem_type->atype) { | |
1871 | case atype_struct: | |
1872 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1873 | if (ret) | |
1874 | return ret; | |
1875 | break; | |
65c85aa6 MD |
1876 | case atype_variant: |
1877 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1878 | if (ret) | |
1879 | return ret; | |
1880 | break; | |
f513b2bf MD |
1881 | default: |
1882 | return -EINVAL; | |
1883 | } | |
1884 | ret = lttng_metadata_printf(session, | |
1885 | " _%s[%u];\n", | |
1886 | field->name, | |
1887 | field->type.u.array_compound.length); | |
1888 | return ret; | |
1889 | } | |
1890 | ||
1891 | /* | |
1892 | * Must be called with sessions_mutex held. | |
1893 | */ | |
1894 | static | |
1895 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
1896 | const struct lttng_event_field *field, | |
1897 | size_t nesting) | |
1898 | { | |
1899 | int ret; | |
1900 | const char *length_name; | |
1901 | const struct lttng_type *elem_type; | |
1902 | ||
1903 | length_name = field->type.u.sequence_compound.length_name; | |
1904 | ||
65c85aa6 | 1905 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1906 | elem_type = field->type.u.sequence_compound.elem_type; |
1907 | switch (elem_type->atype) { | |
1908 | case atype_struct: | |
1909 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1910 | if (ret) | |
1911 | return ret; | |
1912 | break; | |
65c85aa6 MD |
1913 | case atype_variant: |
1914 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1915 | if (ret) | |
1916 | return ret; | |
1917 | break; | |
f513b2bf MD |
1918 | default: |
1919 | return -EINVAL; | |
1920 | } | |
1921 | ret = lttng_metadata_printf(session, | |
1922 | " _%s[ _%s ];\n", | |
1923 | field->name, | |
1924 | length_name); | |
1925 | return ret; | |
1926 | } | |
1927 | ||
141ddf28 MD |
1928 | /* |
1929 | * Must be called with sessions_mutex held. | |
1930 | */ | |
1931 | static | |
1932 | int _lttng_enum_statedump(struct lttng_session *session, | |
1933 | const struct lttng_event_field *field, | |
1934 | size_t nesting) | |
1935 | { | |
1936 | const struct lttng_enum_desc *enum_desc; | |
1937 | const struct lttng_integer_type *container_type; | |
1938 | int ret; | |
1939 | unsigned int i, nr_entries; | |
1940 | ||
1941 | enum_desc = field->type.u.basic.enumeration.desc; | |
1942 | container_type = &field->type.u.basic.enumeration.container_type; | |
1943 | nr_entries = enum_desc->nr_entries; | |
1944 | ||
1945 | ret = print_tabs(session, nesting); | |
1946 | if (ret) | |
1947 | goto end; | |
1948 | ret = lttng_metadata_printf(session, | |
578e68ec | 1949 | "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n", |
141ddf28 MD |
1950 | container_type->size, |
1951 | container_type->alignment, | |
1952 | container_type->signedness, | |
1953 | (container_type->encoding == lttng_encode_none) | |
1954 | ? "none" | |
1955 | : (container_type->encoding == lttng_encode_UTF8) | |
1956 | ? "UTF8" | |
1957 | : "ASCII", | |
578e68ec GB |
1958 | container_type->base, |
1959 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1960 | container_type->reverse_byte_order ? " byte_order = le;" : "" | |
1961 | #else | |
1962 | container_type->reverse_byte_order ? " byte_order = be;" : "" | |
1963 | #endif | |
1964 | ); | |
141ddf28 MD |
1965 | if (ret) |
1966 | goto end; | |
1967 | /* Dump all entries */ | |
1968 | for (i = 0; i < nr_entries; i++) { | |
1969 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
1970 | int j, len; | |
1971 | ||
1972 | ret = print_tabs(session, nesting + 1); | |
1973 | if (ret) | |
1974 | goto end; | |
1975 | ret = lttng_metadata_printf(session, | |
1976 | "\""); | |
1977 | if (ret) | |
1978 | goto end; | |
1979 | len = strlen(entry->string); | |
1980 | /* Escape the character '"' */ | |
1981 | for (j = 0; j < len; j++) { | |
1982 | char c = entry->string[j]; | |
1983 | ||
1984 | switch (c) { | |
1985 | case '"': | |
1986 | ret = lttng_metadata_printf(session, | |
1987 | "\\\""); | |
1988 | break; | |
1989 | case '\\': | |
1990 | ret = lttng_metadata_printf(session, | |
1991 | "\\\\"); | |
1992 | break; | |
1993 | default: | |
1994 | ret = lttng_metadata_printf(session, | |
1995 | "%c", c); | |
1996 | break; | |
1997 | } | |
1998 | if (ret) | |
1999 | goto end; | |
2000 | } | |
08ad1061 PP |
2001 | ret = lttng_metadata_printf(session, "\""); |
2002 | if (ret) | |
2003 | goto end; | |
2004 | ||
2005 | if (entry->options.is_auto) { | |
2006 | ret = lttng_metadata_printf(session, ",\n"); | |
2007 | if (ret) | |
2008 | goto end; | |
141ddf28 | 2009 | } else { |
7c559490 MD |
2010 | ret = lttng_metadata_printf(session, |
2011 | " = "); | |
2012 | if (ret) | |
2013 | goto end; | |
2014 | if (entry->start.signedness) | |
141ddf28 | 2015 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2016 | "%lld", (long long) entry->start.value); |
2017 | else | |
2018 | ret = lttng_metadata_printf(session, | |
2019 | "%llu", entry->start.value); | |
2020 | if (ret) | |
2021 | goto end; | |
2022 | if (entry->start.signedness == entry->end.signedness && | |
2023 | entry->start.value | |
2024 | == entry->end.value) { | |
141ddf28 | 2025 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2026 | ",\n"); |
2027 | } else { | |
2028 | if (entry->end.signedness) { | |
2029 | ret = lttng_metadata_printf(session, | |
2030 | " ... %lld,\n", | |
2031 | (long long) entry->end.value); | |
2032 | } else { | |
2033 | ret = lttng_metadata_printf(session, | |
2034 | " ... %llu,\n", | |
2035 | entry->end.value); | |
2036 | } | |
141ddf28 | 2037 | } |
7c559490 MD |
2038 | if (ret) |
2039 | goto end; | |
141ddf28 | 2040 | } |
141ddf28 MD |
2041 | } |
2042 | ret = print_tabs(session, nesting); | |
2043 | if (ret) | |
2044 | goto end; | |
2045 | ret = lttng_metadata_printf(session, "} _%s;\n", | |
2046 | field->name); | |
2047 | end: | |
2048 | return ret; | |
2049 | } | |
2050 | ||
d83004aa JD |
2051 | /* |
2052 | * Must be called with sessions_mutex held. | |
2053 | */ | |
c099397a | 2054 | static |
a90917c3 | 2055 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2056 | const struct lttng_event_field *field, |
2057 | size_t nesting) | |
c099397a | 2058 | { |
c099397a | 2059 | int ret = 0; |
c099397a | 2060 | |
8070f5c0 MD |
2061 | switch (field->type.atype) { |
2062 | case atype_integer: | |
f513b2bf MD |
2063 | ret = print_tabs(session, nesting); |
2064 | if (ret) | |
2065 | return ret; | |
8070f5c0 | 2066 | ret = lttng_metadata_printf(session, |
f513b2bf | 2067 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
2068 | field->type.u.basic.integer.size, |
2069 | field->type.u.basic.integer.alignment, | |
2070 | field->type.u.basic.integer.signedness, | |
2071 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
2072 | ? "none" | |
2073 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
2074 | ? "UTF8" | |
2075 | : "ASCII", | |
2076 | field->type.u.basic.integer.base, | |
5214fa50 | 2077 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2078 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 2079 | #else |
8070f5c0 | 2080 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 2081 | #endif |
8070f5c0 MD |
2082 | field->name); |
2083 | break; | |
2084 | case atype_enum: | |
141ddf28 | 2085 | ret = _lttng_enum_statedump(session, field, nesting); |
8070f5c0 MD |
2086 | break; |
2087 | case atype_array: | |
3834b99f | 2088 | case atype_array_bitfield: |
8070f5c0 MD |
2089 | { |
2090 | const struct lttng_basic_type *elem_type; | |
2091 | ||
2092 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 2093 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
2094 | ret = print_tabs(session, nesting); |
2095 | if (ret) | |
2096 | return ret; | |
43803cf2 | 2097 | ret = lttng_metadata_printf(session, |
f513b2bf | 2098 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2099 | field->type.u.array.elem_alignment * CHAR_BIT, |
2100 | field->name); | |
2101 | if (ret) | |
2102 | return ret; | |
2103 | } | |
f513b2bf MD |
2104 | ret = print_tabs(session, nesting); |
2105 | if (ret) | |
2106 | return ret; | |
8070f5c0 | 2107 | ret = lttng_metadata_printf(session, |
f513b2bf | 2108 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
2109 | elem_type->u.basic.integer.size, |
2110 | elem_type->u.basic.integer.alignment, | |
2111 | elem_type->u.basic.integer.signedness, | |
2112 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2113 | ? "none" | |
2114 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
2115 | ? "UTF8" | |
2116 | : "ASCII", | |
2117 | elem_type->u.basic.integer.base, | |
5214fa50 | 2118 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2119 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2120 | #else |
8070f5c0 | 2121 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2122 | #endif |
8070f5c0 MD |
2123 | field->name, field->type.u.array.length); |
2124 | break; | |
2125 | } | |
2126 | case atype_sequence: | |
3834b99f | 2127 | case atype_sequence_bitfield: |
8070f5c0 MD |
2128 | { |
2129 | const struct lttng_basic_type *elem_type; | |
2130 | const struct lttng_basic_type *length_type; | |
2131 | ||
2132 | elem_type = &field->type.u.sequence.elem_type; | |
2133 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
2134 | ret = print_tabs(session, nesting); |
2135 | if (ret) | |
2136 | return ret; | |
8070f5c0 | 2137 | ret = lttng_metadata_printf(session, |
f513b2bf | 2138 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 2139 | length_type->u.basic.integer.size, |
32257272 | 2140 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
2141 | length_type->u.basic.integer.signedness, |
2142 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
2143 | ? "none" | |
0635cdd4 | 2144 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2145 | ? "UTF8" |
0635cdd4 | 2146 | : "ASCII"), |
8070f5c0 | 2147 | length_type->u.basic.integer.base, |
5214fa50 | 2148 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2149 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 2150 | #else |
0635cdd4 | 2151 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 2152 | #endif |
27d2368e MD |
2153 | field->name); |
2154 | if (ret) | |
2155 | return ret; | |
2156 | ||
43803cf2 | 2157 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
2158 | ret = print_tabs(session, nesting); |
2159 | if (ret) | |
2160 | return ret; | |
43803cf2 | 2161 | ret = lttng_metadata_printf(session, |
f513b2bf | 2162 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2163 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
2164 | field->name); | |
2165 | if (ret) | |
2166 | return ret; | |
2167 | } | |
f513b2bf MD |
2168 | ret = print_tabs(session, nesting); |
2169 | if (ret) | |
2170 | return ret; | |
27d2368e | 2171 | ret = lttng_metadata_printf(session, |
f513b2bf | 2172 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 2173 | elem_type->u.basic.integer.size, |
32257272 | 2174 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
2175 | elem_type->u.basic.integer.signedness, |
2176 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2177 | ? "none" | |
0635cdd4 | 2178 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2179 | ? "UTF8" |
0635cdd4 | 2180 | : "ASCII"), |
8070f5c0 | 2181 | elem_type->u.basic.integer.base, |
5214fa50 | 2182 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2183 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2184 | #else |
8070f5c0 | 2185 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2186 | #endif |
8070f5c0 | 2187 | field->name, |
27d2368e | 2188 | field->name); |
8070f5c0 MD |
2189 | break; |
2190 | } | |
c099397a | 2191 | |
8070f5c0 MD |
2192 | case atype_string: |
2193 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2194 | ret = print_tabs(session, nesting); |
2195 | if (ret) | |
2196 | return ret; | |
8070f5c0 | 2197 | ret = lttng_metadata_printf(session, |
f513b2bf | 2198 | "string%s _%s;\n", |
8070f5c0 MD |
2199 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2200 | " { encoding = ASCII; }" : "", | |
2201 | field->name); | |
2202 | break; | |
f513b2bf MD |
2203 | case atype_struct: |
2204 | ret = _lttng_struct_statedump(session, field, nesting); | |
2205 | break; | |
2206 | case atype_array_compound: | |
2207 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2208 | break; | |
2209 | case atype_sequence_compound: | |
2210 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2211 | break; | |
65c85aa6 MD |
2212 | case atype_variant: |
2213 | ret = _lttng_variant_statedump(session, field, nesting); | |
2214 | break; | |
f513b2bf | 2215 | |
8070f5c0 MD |
2216 | default: |
2217 | WARN_ON_ONCE(1); | |
2218 | return -EINVAL; | |
2219 | } | |
2220 | return ret; | |
2221 | } | |
2222 | ||
2223 | static | |
a90917c3 | 2224 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2225 | struct lttng_ctx *ctx) |
2226 | { | |
2227 | int ret = 0; | |
2228 | int i; | |
2229 | ||
2230 | if (!ctx) | |
2231 | return 0; | |
2232 | for (i = 0; i < ctx->nr_fields; i++) { | |
2233 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2234 | ||
f513b2bf | 2235 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2236 | if (ret) |
2237 | return ret; | |
2238 | } | |
2239 | return ret; | |
2240 | } | |
2241 | ||
2242 | static | |
a90917c3 MD |
2243 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2244 | struct lttng_event *event) | |
8070f5c0 MD |
2245 | { |
2246 | const struct lttng_event_desc *desc = event->desc; | |
2247 | int ret = 0; | |
2248 | int i; | |
2249 | ||
2250 | for (i = 0; i < desc->nr_fields; i++) { | |
2251 | const struct lttng_event_field *field = &desc->fields[i]; | |
2252 | ||
f513b2bf | 2253 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2254 | if (ret) |
2255 | return ret; | |
c099397a MD |
2256 | } |
2257 | return ret; | |
2258 | } | |
2259 | ||
d83004aa JD |
2260 | /* |
2261 | * Must be called with sessions_mutex held. | |
2262 | */ | |
c099397a | 2263 | static |
a90917c3 MD |
2264 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2265 | struct lttng_channel *chan, | |
2266 | struct lttng_event *event) | |
c099397a MD |
2267 | { |
2268 | int ret = 0; | |
2269 | ||
a8f2d0c7 | 2270 | if (event->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2271 | return 0; |
d83004aa | 2272 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2273 | return 0; |
2274 | ||
2275 | ret = lttng_metadata_printf(session, | |
2276 | "event {\n" | |
ae734547 | 2277 | " name = \"%s\";\n" |
c099397a | 2278 | " id = %u;\n" |
b9074a1b | 2279 | " stream_id = %u;\n", |
c099397a MD |
2280 | event->desc->name, |
2281 | event->id, | |
2282 | event->chan->id); | |
2283 | if (ret) | |
2284 | goto end; | |
2285 | ||
b9074a1b MD |
2286 | if (event->ctx) { |
2287 | ret = lttng_metadata_printf(session, | |
2288 | " context := struct {\n"); | |
2289 | if (ret) | |
2290 | goto end; | |
2291 | } | |
a90917c3 | 2292 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2293 | if (ret) |
2294 | goto end; | |
b9074a1b MD |
2295 | if (event->ctx) { |
2296 | ret = lttng_metadata_printf(session, | |
2297 | " };\n"); | |
2298 | if (ret) | |
2299 | goto end; | |
2300 | } | |
8070f5c0 MD |
2301 | |
2302 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2303 | " fields := struct {\n" |
2304 | ); | |
2305 | if (ret) | |
2306 | goto end; | |
2307 | ||
a90917c3 | 2308 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2309 | if (ret) |
2310 | goto end; | |
2311 | ||
2312 | /* | |
2313 | * LTTng space reservation can only reserve multiples of the | |
2314 | * byte size. | |
2315 | */ | |
2316 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2317 | " };\n" |
2318 | "};\n\n"); | |
c099397a MD |
2319 | if (ret) |
2320 | goto end; | |
2321 | ||
c099397a MD |
2322 | event->metadata_dumped = 1; |
2323 | end: | |
2324 | return ret; | |
2325 | ||
2326 | } | |
2327 | ||
d83004aa JD |
2328 | /* |
2329 | * Must be called with sessions_mutex held. | |
2330 | */ | |
c099397a | 2331 | static |
a90917c3 MD |
2332 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2333 | struct lttng_channel *chan) | |
c099397a MD |
2334 | { |
2335 | int ret = 0; | |
2336 | ||
a8f2d0c7 | 2337 | if (chan->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2338 | return 0; |
d83004aa JD |
2339 | |
2340 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2341 | return 0; |
2342 | ||
2343 | WARN_ON_ONCE(!chan->header_type); | |
2344 | ret = lttng_metadata_printf(session, | |
2345 | "stream {\n" | |
2346 | " id = %u;\n" | |
9115fbdc | 2347 | " event.header := %s;\n" |
b9074a1b | 2348 | " packet.context := struct packet_context;\n", |
c099397a MD |
2349 | chan->id, |
2350 | chan->header_type == 1 ? "struct event_header_compact" : | |
2351 | "struct event_header_large"); | |
2352 | if (ret) | |
2353 | goto end; | |
2354 | ||
b9074a1b MD |
2355 | if (chan->ctx) { |
2356 | ret = lttng_metadata_printf(session, | |
2357 | " event.context := struct {\n"); | |
2358 | if (ret) | |
2359 | goto end; | |
2360 | } | |
a90917c3 | 2361 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2362 | if (ret) |
2363 | goto end; | |
b9074a1b MD |
2364 | if (chan->ctx) { |
2365 | ret = lttng_metadata_printf(session, | |
2366 | " };\n"); | |
2367 | if (ret) | |
2368 | goto end; | |
2369 | } | |
8070f5c0 MD |
2370 | |
2371 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2372 | "};\n\n"); |
8070f5c0 | 2373 | |
c099397a MD |
2374 | chan->metadata_dumped = 1; |
2375 | end: | |
2376 | return ret; | |
2377 | } | |
2378 | ||
d83004aa JD |
2379 | /* |
2380 | * Must be called with sessions_mutex held. | |
2381 | */ | |
9115fbdc | 2382 | static |
a90917c3 | 2383 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2384 | { |
2385 | return lttng_metadata_printf(session, | |
2386 | "struct packet_context {\n" | |
a3ccff4f MD |
2387 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2388 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2389 | " uint64_t content_size;\n" |
2390 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2391 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2392 | " unsigned long events_discarded;\n" |
9115fbdc | 2393 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2394 | "};\n\n" |
9115fbdc MD |
2395 | ); |
2396 | } | |
2397 | ||
2398 | /* | |
2399 | * Compact header: | |
2400 | * id: range: 0 - 30. | |
2401 | * id 31 is reserved to indicate an extended header. | |
2402 | * | |
2403 | * Large header: | |
2404 | * id: range: 0 - 65534. | |
2405 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2406 | * |
2407 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2408 | */ |
2409 | static | |
a90917c3 | 2410 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2411 | { |
2412 | return lttng_metadata_printf(session, | |
2413 | "struct event_header_compact {\n" | |
2414 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2415 | " variant <id> {\n" | |
2416 | " struct {\n" | |
a3ccff4f | 2417 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2418 | " } compact;\n" |
2419 | " struct {\n" | |
2420 | " uint32_t id;\n" | |
a3ccff4f | 2421 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2422 | " } extended;\n" |
2423 | " } v;\n" | |
2424 | "} align(%u);\n" | |
2425 | "\n" | |
2426 | "struct event_header_large {\n" | |
2427 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2428 | " variant <id> {\n" | |
2429 | " struct {\n" | |
a3ccff4f | 2430 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2431 | " } compact;\n" |
2432 | " struct {\n" | |
2433 | " uint32_t id;\n" | |
a3ccff4f | 2434 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2435 | " } extended;\n" |
2436 | " } v;\n" | |
2437 | "} align(%u);\n\n", | |
a90917c3 MD |
2438 | lttng_alignof(uint32_t) * CHAR_BIT, |
2439 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2440 | ); |
2441 | } | |
2442 | ||
a3ccff4f MD |
2443 | /* |
2444 | * Approximation of NTP time of day to clock monotonic correlation, | |
2445 | * taken at start of trace. | |
2446 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2447 | * in future versions. | |
5283350b MD |
2448 | * This function may return a negative offset. It may happen if the |
2449 | * system sets the REALTIME clock to 0 after boot. | |
a3ccff4f MD |
2450 | */ |
2451 | static | |
8967b2a3 | 2452 | int64_t measure_clock_offset(void) |
a3ccff4f | 2453 | { |
dcb93448 | 2454 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2455 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2456 | int64_t offset; |
a3ccff4f MD |
2457 | struct timespec rts = { 0, 0 }; |
2458 | unsigned long flags; | |
2459 | ||
2460 | /* Disable interrupts to increase correlation precision. */ | |
2461 | local_irq_save(flags); | |
2462 | monotonic[0] = trace_clock_read64(); | |
216b6baa | 2463 | getnstimeofday(&rts); |
a3ccff4f MD |
2464 | monotonic[1] = trace_clock_read64(); |
2465 | local_irq_restore(flags); | |
2466 | ||
dcb93448 | 2467 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2468 | realtime = (uint64_t) rts.tv_sec * tcf; |
2469 | if (tcf == NSEC_PER_SEC) { | |
2470 | realtime += rts.tv_nsec; | |
2471 | } else { | |
2472 | uint64_t n = rts.tv_nsec * tcf; | |
2473 | ||
2474 | do_div(n, NSEC_PER_SEC); | |
2475 | realtime += n; | |
2476 | } | |
dcb93448 | 2477 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2478 | return offset; |
2479 | } | |
2480 | ||
c099397a MD |
2481 | /* |
2482 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2483 | * Must be called with sessions_mutex held. |
c099397a MD |
2484 | */ |
2485 | static | |
a90917c3 | 2486 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2487 | { |
30bdb6e4 | 2488 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2489 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2490 | struct lttng_channel *chan; |
2491 | struct lttng_event *event; | |
c099397a MD |
2492 | int ret = 0; |
2493 | ||
a8f2d0c7 | 2494 | if (!READ_ONCE(session->active)) |
c099397a MD |
2495 | return 0; |
2496 | if (session->metadata_dumped) | |
2497 | goto skip_session; | |
c099397a | 2498 | |
d793d5e1 | 2499 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2500 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2501 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2502 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2503 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2504 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2505 | |
2506 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2507 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2508 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2509 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2510 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2511 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2512 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2513 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2514 | "\n" |
2515 | "trace {\n" | |
2516 | " major = %u;\n" | |
2517 | " minor = %u;\n" | |
30bdb6e4 | 2518 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2519 | " byte_order = %s;\n" |
2520 | " packet.header := struct {\n" | |
2521 | " uint32_t magic;\n" | |
1ec3f75a | 2522 | " uint8_t uuid[16];\n" |
d793d5e1 | 2523 | " uint32_t stream_id;\n" |
5594698f | 2524 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2525 | " };\n" |
d793d5e1 | 2526 | "};\n\n", |
a90917c3 MD |
2527 | lttng_alignof(uint8_t) * CHAR_BIT, |
2528 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2529 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2530 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2531 | sizeof(unsigned long) * CHAR_BIT, |
2532 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2533 | CTF_SPEC_MAJOR, |
2534 | CTF_SPEC_MINOR, | |
d793d5e1 | 2535 | uuid_s, |
5214fa50 | 2536 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2537 | "be" |
2538 | #else | |
2539 | "le" | |
2540 | #endif | |
2541 | ); | |
2542 | if (ret) | |
2543 | goto end; | |
2544 | ||
99dc9597 MD |
2545 | ret = lttng_metadata_printf(session, |
2546 | "env {\n" | |
a6058143 | 2547 | " hostname = \"%s\";\n" |
c6c9e10f | 2548 | " domain = \"kernel\";\n" |
99dc9597 | 2549 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2550 | " kernel_release = \"%s\";\n" |
2551 | " kernel_version = \"%s\";\n" | |
2552 | " tracer_name = \"lttng-modules\";\n" | |
2553 | " tracer_major = %d;\n" | |
2554 | " tracer_minor = %d;\n" | |
2555 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2556 | "};\n\n", |
3d0d43db | 2557 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2558 | utsname()->sysname, |
2559 | utsname()->release, | |
c6c9e10f MD |
2560 | utsname()->version, |
2561 | LTTNG_MODULES_MAJOR_VERSION, | |
2562 | LTTNG_MODULES_MINOR_VERSION, | |
2563 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2564 | ); |
2565 | if (ret) | |
2566 | goto end; | |
2567 | ||
a3ccff4f MD |
2568 | ret = lttng_metadata_printf(session, |
2569 | "clock {\n" | |
2754583e MD |
2570 | " name = \"%s\";\n", |
2571 | trace_clock_name() | |
a82c63f1 MD |
2572 | ); |
2573 | if (ret) | |
2574 | goto end; | |
2575 | ||
2576 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2577 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2578 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2579 | clock_uuid_s |
2580 | ); | |
2581 | if (ret) | |
2582 | goto end; | |
2583 | } | |
2584 | ||
2585 | ret = lttng_metadata_printf(session, | |
2754583e | 2586 | " description = \"%s\";\n" |
a3ccff4f MD |
2587 | " freq = %llu; /* Frequency, in Hz */\n" |
2588 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2589 | " offset = %lld;\n" |
a3ccff4f | 2590 | "};\n\n", |
2754583e | 2591 | trace_clock_description(), |
a3ccff4f | 2592 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2593 | (long long) measure_clock_offset() |
a3ccff4f MD |
2594 | ); |
2595 | if (ret) | |
2596 | goto end; | |
2597 | ||
2598 | ret = lttng_metadata_printf(session, | |
2599 | "typealias integer {\n" | |
2600 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2601 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2602 | "} := uint27_clock_monotonic_t;\n" |
2603 | "\n" | |
2604 | "typealias integer {\n" | |
2605 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2606 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2607 | "} := uint32_clock_monotonic_t;\n" |
2608 | "\n" | |
2609 | "typealias integer {\n" | |
2610 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2611 | " map = clock.%s.value;\n" |
a3ccff4f | 2612 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2613 | trace_clock_name(), |
a3ccff4f | 2614 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2615 | trace_clock_name(), |
2616 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2617 | trace_clock_name() | |
a3ccff4f MD |
2618 | ); |
2619 | if (ret) | |
2620 | goto end; | |
2621 | ||
a90917c3 | 2622 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2623 | if (ret) |
2624 | goto end; | |
2625 | ||
a90917c3 | 2626 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2627 | if (ret) |
2628 | goto end; | |
2629 | ||
c099397a MD |
2630 | skip_session: |
2631 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2632 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2633 | if (ret) |
2634 | goto end; | |
2635 | } | |
2636 | ||
2637 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2638 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2639 | if (ret) |
2640 | goto end; | |
2641 | } | |
2642 | session->metadata_dumped = 1; | |
2643 | end: | |
2644 | return ret; | |
2645 | } | |
2646 | ||
c0e31d2e | 2647 | /** |
a90917c3 | 2648 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2649 | * @transport: transport structure |
2650 | * | |
2651 | * Registers a transport which can be used as output to extract the data out of | |
2652 | * LTTng. The module calling this registration function must ensure that no | |
2653 | * trap-inducing code will be executed by the transport functions. E.g. | |
2654 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2655 | * is made visible to the transport function. This registration acts as a | |
2656 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2657 | * after its registration must it synchronize the TLBs. | |
2658 | */ | |
a90917c3 | 2659 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2660 | { |
2661 | /* | |
2662 | * Make sure no page fault can be triggered by the module about to be | |
2663 | * registered. We deal with this here so we don't have to call | |
2664 | * vmalloc_sync_all() in each module's init. | |
2665 | */ | |
6d2a620c | 2666 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2667 | |
2668 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2669 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2670 | mutex_unlock(&sessions_mutex); |
2671 | } | |
a90917c3 | 2672 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2673 | |
2674 | /** | |
a90917c3 | 2675 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2676 | * @transport: transport structure |
2677 | */ | |
a90917c3 | 2678 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2679 | { |
2680 | mutex_lock(&sessions_mutex); | |
2681 | list_del(&transport->node); | |
2682 | mutex_unlock(&sessions_mutex); | |
2683 | } | |
a90917c3 | 2684 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2685 | |
894ce5dc | 2686 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2687 | |
2688 | enum cpuhp_state lttng_hp_prepare; | |
2689 | enum cpuhp_state lttng_hp_online; | |
2690 | ||
2691 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2692 | { | |
2693 | struct lttng_cpuhp_node *lttng_node; | |
2694 | ||
2695 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2696 | switch (lttng_node->component) { | |
2697 | case LTTNG_RING_BUFFER_FRONTEND: | |
2698 | return 0; | |
2699 | case LTTNG_RING_BUFFER_BACKEND: | |
2700 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2701 | case LTTNG_RING_BUFFER_ITER: | |
2702 | return 0; | |
2703 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2704 | return 0; | |
2705 | default: | |
2706 | return -EINVAL; | |
2707 | } | |
2708 | } | |
2709 | ||
2710 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2711 | { | |
2712 | struct lttng_cpuhp_node *lttng_node; | |
2713 | ||
2714 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2715 | switch (lttng_node->component) { | |
2716 | case LTTNG_RING_BUFFER_FRONTEND: | |
2717 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2718 | case LTTNG_RING_BUFFER_BACKEND: | |
2719 | return 0; | |
2720 | case LTTNG_RING_BUFFER_ITER: | |
2721 | return 0; | |
2722 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2723 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2724 | default: | |
2725 | return -EINVAL; | |
2726 | } | |
2727 | } | |
2728 | ||
2729 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2730 | { | |
2731 | struct lttng_cpuhp_node *lttng_node; | |
2732 | ||
2733 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2734 | switch (lttng_node->component) { | |
2735 | case LTTNG_RING_BUFFER_FRONTEND: | |
2736 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2737 | case LTTNG_RING_BUFFER_BACKEND: | |
2738 | return 0; | |
2739 | case LTTNG_RING_BUFFER_ITER: | |
2740 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2741 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2742 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2743 | default: | |
2744 | return -EINVAL; | |
2745 | } | |
2746 | } | |
2747 | ||
2748 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2749 | { | |
2750 | struct lttng_cpuhp_node *lttng_node; | |
2751 | ||
2752 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2753 | switch (lttng_node->component) { | |
2754 | case LTTNG_RING_BUFFER_FRONTEND: | |
2755 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2756 | case LTTNG_RING_BUFFER_BACKEND: | |
2757 | return 0; | |
2758 | case LTTNG_RING_BUFFER_ITER: | |
2759 | return 0; | |
2760 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2761 | return 0; | |
2762 | default: | |
2763 | return -EINVAL; | |
2764 | } | |
2765 | } | |
2766 | ||
2767 | static int __init lttng_init_cpu_hotplug(void) | |
2768 | { | |
2769 | int ret; | |
2770 | ||
2771 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2772 | lttng_hotplug_prepare, | |
2773 | lttng_hotplug_dead); | |
2774 | if (ret < 0) { | |
2775 | return ret; | |
2776 | } | |
2777 | lttng_hp_prepare = ret; | |
2778 | lttng_rb_set_hp_prepare(ret); | |
2779 | ||
2780 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2781 | lttng_hotplug_online, | |
2782 | lttng_hotplug_offline); | |
2783 | if (ret < 0) { | |
2784 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2785 | lttng_hp_prepare = 0; | |
2786 | return ret; | |
2787 | } | |
2788 | lttng_hp_online = ret; | |
2789 | lttng_rb_set_hp_online(ret); | |
2790 | ||
2791 | return 0; | |
2792 | } | |
2793 | ||
2794 | static void __exit lttng_exit_cpu_hotplug(void) | |
2795 | { | |
2796 | lttng_rb_set_hp_online(0); | |
2797 | cpuhp_remove_multi_state(lttng_hp_online); | |
2798 | lttng_rb_set_hp_prepare(0); | |
2799 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2800 | } | |
2801 | ||
1ee63d8d | 2802 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2803 | static int lttng_init_cpu_hotplug(void) |
2804 | { | |
2805 | return 0; | |
2806 | } | |
2807 | static void lttng_exit_cpu_hotplug(void) | |
2808 | { | |
2809 | } | |
1ee63d8d | 2810 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2811 | |
2812 | ||
a90917c3 | 2813 | static int __init lttng_events_init(void) |
4e3c1b9b | 2814 | { |
1c25284c MD |
2815 | int ret; |
2816 | ||
453b2495 JD |
2817 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2818 | if (ret) | |
2819 | return ret; | |
389d7070 | 2820 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2821 | if (ret) |
2822 | return ret; | |
2823 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
2824 | if (ret) |
2825 | return ret; | |
2826 | ret = lttng_probes_init(); | |
389d7070 MD |
2827 | if (ret) |
2828 | return ret; | |
07dfc1d0 | 2829 | ret = lttng_context_init(); |
20591cf7 MD |
2830 | if (ret) |
2831 | return ret; | |
07dfc1d0 MD |
2832 | ret = lttng_tracepoint_init(); |
2833 | if (ret) | |
2834 | goto error_tp; | |
a90917c3 | 2835 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2836 | if (!event_cache) { |
2837 | ret = -ENOMEM; | |
2838 | goto error_kmem; | |
2839 | } | |
80996790 | 2840 | ret = lttng_abi_init(); |
02119ee5 MD |
2841 | if (ret) |
2842 | goto error_abi; | |
0c956676 MD |
2843 | ret = lttng_logger_init(); |
2844 | if (ret) | |
2845 | goto error_logger; | |
1e367326 MD |
2846 | ret = lttng_init_cpu_hotplug(); |
2847 | if (ret) | |
2848 | goto error_hotplug; | |
101215b7 | 2849 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2850 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2851 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2852 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2853 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2854 | LTTNG_VERSION_NAME, |
2855 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2856 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2857 | #else | |
2858 | "", | |
2859 | #endif | |
2860 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2861 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2862 | #else | |
2863 | ""); | |
2864 | #endif | |
4e3c1b9b | 2865 | return 0; |
0c956676 | 2866 | |
1e367326 MD |
2867 | error_hotplug: |
2868 | lttng_logger_exit(); | |
0c956676 MD |
2869 | error_logger: |
2870 | lttng_abi_exit(); | |
02119ee5 | 2871 | error_abi: |
1c25284c | 2872 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2873 | error_kmem: |
2874 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2875 | error_tp: |
2876 | lttng_context_exit(); | |
101215b7 | 2877 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2878 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2879 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2880 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2881 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2882 | LTTNG_VERSION_NAME, |
2883 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2884 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2885 | #else | |
2886 | "", | |
2887 | #endif | |
2888 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2889 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2890 | #else | |
2891 | ""); | |
2892 | #endif | |
1c25284c | 2893 | return ret; |
4e3c1b9b MD |
2894 | } |
2895 | ||
a90917c3 | 2896 | module_init(lttng_events_init); |
11b5a3c2 | 2897 | |
a90917c3 | 2898 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2899 | { |
a90917c3 | 2900 | struct lttng_session *session, *tmpsession; |
92e94819 | 2901 | |
1e367326 | 2902 | lttng_exit_cpu_hotplug(); |
0c956676 | 2903 | lttng_logger_exit(); |
80996790 | 2904 | lttng_abi_exit(); |
92e94819 | 2905 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2906 | lttng_session_destroy(session); |
11b5a3c2 | 2907 | kmem_cache_destroy(event_cache); |
20591cf7 | 2908 | lttng_tracepoint_exit(); |
07dfc1d0 | 2909 | lttng_context_exit(); |
101215b7 | 2910 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2911 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2912 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2913 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2914 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2915 | LTTNG_VERSION_NAME, |
2916 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2917 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2918 | #else | |
2919 | "", | |
2920 | #endif | |
2921 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2922 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2923 | #else | |
2924 | ""); | |
2925 | #endif | |
4e3c1b9b | 2926 | } |
92e94819 | 2927 | |
a90917c3 | 2928 | module_exit(lttng_events_exit); |
11b5a3c2 | 2929 | |
101215b7 MJ |
2930 | #include "extra_version/patches.i" |
2931 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2932 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
2933 | #endif | |
2934 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2935 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
2936 | #endif | |
92e94819 MD |
2937 | MODULE_LICENSE("GPL and additional rights"); |
2938 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 2939 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
2940 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2941 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2942 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2943 | LTTNG_MODULES_EXTRAVERSION); |