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> |
3c997079 | 30 | |
241ae9a8 MD |
31 | #include <wrapper/uuid.h> |
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> |
241ae9a8 | 43 | #include <wrapper/vzalloc.h> |
64af2437 MD |
44 | #include <wrapper/ringbuffer/backend.h> |
45 | #include <wrapper/ringbuffer/frontend.h> | |
4e3c1b9b | 46 | |
d83004aa JD |
47 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
48 | ||
4e3c1b9b | 49 | static LIST_HEAD(sessions); |
a90917c3 | 50 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
51 | /* |
52 | * Protect the sessions and metadata caches. | |
53 | */ | |
4e3c1b9b MD |
54 | static DEFINE_MUTEX(sessions_mutex); |
55 | static struct kmem_cache *event_cache; | |
56 | ||
3c997079 MD |
57 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
58 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
59 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
60 | ||
a90917c3 MD |
61 | static void _lttng_event_destroy(struct lttng_event *event); |
62 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
63 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 64 | static |
a90917c3 MD |
65 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
66 | struct lttng_channel *chan, | |
67 | struct lttng_event *event); | |
c099397a | 68 | static |
a90917c3 | 69 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
70 | static |
71 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf MD |
72 | static |
73 | int _lttng_field_statedump(struct lttng_session *session, | |
74 | const struct lttng_event_field *field, | |
75 | size_t nesting); | |
c099397a | 76 | |
c099397a | 77 | void synchronize_trace(void) |
abcca994 | 78 | { |
f4a8ec4d MJ |
79 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
80 | synchronize_rcu(); | |
81 | #else | |
abcca994 | 82 | synchronize_sched(); |
f4a8ec4d MJ |
83 | #endif |
84 | ||
b8590f40 MD |
85 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
86 | #ifdef CONFIG_PREEMPT_RT_FULL | |
87 | synchronize_rcu(); | |
88 | #endif | |
89 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
90 | #ifdef CONFIG_PREEMPT_RT |
91 | synchronize_rcu(); | |
92 | #endif | |
b8590f40 | 93 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
94 | } |
95 | ||
3c997079 MD |
96 | void lttng_lock_sessions(void) |
97 | { | |
98 | mutex_lock(&sessions_mutex); | |
99 | } | |
100 | ||
101 | void lttng_unlock_sessions(void) | |
102 | { | |
103 | mutex_unlock(&sessions_mutex); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Called with sessions lock held. | |
108 | */ | |
109 | int lttng_session_active(void) | |
110 | { | |
111 | struct lttng_session *iter; | |
112 | ||
113 | list_for_each_entry(iter, &sessions, list) { | |
114 | if (iter->active) | |
115 | return 1; | |
116 | } | |
117 | return 0; | |
118 | } | |
119 | ||
a90917c3 | 120 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 121 | { |
a90917c3 | 122 | struct lttng_session *session; |
d83004aa | 123 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 124 | int i; |
4e3c1b9b MD |
125 | |
126 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 127 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 128 | if (!session) |
d83004aa | 129 | goto err; |
4e3c1b9b | 130 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 131 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 132 | uuid_le_gen(&session->uuid); |
d83004aa JD |
133 | |
134 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
135 | GFP_KERNEL); | |
136 | if (!metadata_cache) | |
137 | goto err_free_session; | |
f6da044f | 138 | metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
139 | if (!metadata_cache->data) |
140 | goto err_free_cache; | |
141 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
142 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 143 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
144 | session->metadata_cache = metadata_cache; |
145 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
146 | memcpy(&metadata_cache->uuid, &session->uuid, |
147 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
148 | INIT_LIST_HEAD(&session->enablers_head); |
149 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
150 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
151 | list_add(&session->list, &sessions); |
152 | mutex_unlock(&sessions_mutex); | |
153 | return session; | |
d83004aa JD |
154 | |
155 | err_free_cache: | |
156 | kfree(metadata_cache); | |
157 | err_free_session: | |
48f5e0b5 | 158 | lttng_kvfree(session); |
d83004aa JD |
159 | err: |
160 | mutex_unlock(&sessions_mutex); | |
161 | return NULL; | |
162 | } | |
163 | ||
164 | void metadata_cache_destroy(struct kref *kref) | |
165 | { | |
166 | struct lttng_metadata_cache *cache = | |
167 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 168 | vfree(cache->data); |
d83004aa | 169 | kfree(cache); |
4e3c1b9b MD |
170 | } |
171 | ||
a90917c3 | 172 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 173 | { |
a90917c3 MD |
174 | struct lttng_channel *chan, *tmpchan; |
175 | struct lttng_event *event, *tmpevent; | |
d83004aa | 176 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 177 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 178 | int ret; |
4e3c1b9b MD |
179 | |
180 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 181 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
182 | list_for_each_entry(chan, &session->chan, list) { |
183 | ret = lttng_syscalls_unregister(chan); | |
184 | WARN_ON(ret); | |
185 | } | |
dda6a249 | 186 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 187 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
188 | WARN_ON(ret); |
189 | } | |
abcca994 | 190 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
191 | list_for_each_entry_safe(enabler, tmpenabler, |
192 | &session->enablers_head, node) | |
193 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 194 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 195 | _lttng_event_destroy(event); |
d83004aa JD |
196 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
197 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 198 | _lttng_channel_destroy(chan); |
d83004aa JD |
199 | } |
200 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
201 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
202 | if (session->pid_tracker) |
203 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 204 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
205 | list_del(&session->list); |
206 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 207 | lttng_kvfree(session); |
4e3c1b9b MD |
208 | } |
209 | ||
601252cf MD |
210 | int lttng_session_statedump(struct lttng_session *session) |
211 | { | |
212 | int ret; | |
213 | ||
214 | mutex_lock(&sessions_mutex); | |
215 | ret = lttng_statedump_start(session); | |
216 | mutex_unlock(&sessions_mutex); | |
217 | return ret; | |
218 | } | |
219 | ||
a90917c3 | 220 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
221 | { |
222 | int ret = 0; | |
a90917c3 | 223 | struct lttng_channel *chan; |
c0e31d2e MD |
224 | |
225 | mutex_lock(&sessions_mutex); | |
226 | if (session->active) { | |
227 | ret = -EBUSY; | |
228 | goto end; | |
229 | } | |
c099397a | 230 | |
3c997079 MD |
231 | /* Set transient enabler state to "enabled" */ |
232 | session->tstate = 1; | |
233 | ||
c099397a MD |
234 | /* |
235 | * Snapshot the number of events per channel to know the type of header | |
236 | * we need to use. | |
237 | */ | |
238 | list_for_each_entry(chan, &session->chan, list) { | |
239 | if (chan->header_type) | |
240 | continue; /* don't change it if session stop/restart */ | |
241 | if (chan->free_event_id < 31) | |
242 | chan->header_type = 1; /* compact */ | |
243 | else | |
244 | chan->header_type = 2; /* large */ | |
245 | } | |
246 | ||
3c997079 MD |
247 | /* We need to sync enablers with session before activation. */ |
248 | lttng_session_sync_enablers(session); | |
249 | ||
64af2437 | 250 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
251 | list_for_each_entry(chan, &session->chan, list) { |
252 | if (chan->channel_type != METADATA_CHANNEL) | |
253 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
254 | } | |
64af2437 | 255 | |
a8f2d0c7 MJ |
256 | WRITE_ONCE(session->active, 1); |
257 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 258 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 259 | if (ret) { |
a8f2d0c7 | 260 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
261 | goto end; |
262 | } | |
263 | ret = lttng_statedump_start(session); | |
360f38ea | 264 | if (ret) |
a8f2d0c7 | 265 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
266 | end: |
267 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 268 | return ret; |
c0e31d2e MD |
269 | } |
270 | ||
a90917c3 | 271 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
272 | { |
273 | int ret = 0; | |
64af2437 | 274 | struct lttng_channel *chan; |
c0e31d2e MD |
275 | |
276 | mutex_lock(&sessions_mutex); | |
277 | if (!session->active) { | |
278 | ret = -EBUSY; | |
279 | goto end; | |
280 | } | |
a8f2d0c7 | 281 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
282 | |
283 | /* Set transient enabler state to "disabled" */ | |
284 | session->tstate = 0; | |
285 | lttng_session_sync_enablers(session); | |
64af2437 MD |
286 | |
287 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
288 | list_for_each_entry(chan, &session->chan, list) { |
289 | if (chan->channel_type != METADATA_CHANNEL) | |
290 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
291 | } | |
c0e31d2e MD |
292 | end: |
293 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 294 | return ret; |
c0e31d2e MD |
295 | } |
296 | ||
9616f0bf JD |
297 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
298 | { | |
299 | int ret = 0; | |
300 | struct lttng_channel *chan; | |
301 | struct lttng_event *event; | |
302 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
303 | struct lttng_metadata_stream *stream; | |
304 | ||
305 | mutex_lock(&sessions_mutex); | |
306 | if (!session->active) { | |
307 | ret = -EBUSY; | |
308 | goto end; | |
309 | } | |
310 | ||
311 | mutex_lock(&cache->lock); | |
312 | memset(cache->data, 0, cache->cache_alloc); | |
313 | cache->metadata_written = 0; | |
314 | cache->version++; | |
315 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
316 | stream->metadata_out = 0; | |
317 | stream->metadata_in = 0; | |
318 | } | |
319 | mutex_unlock(&cache->lock); | |
320 | ||
321 | session->metadata_dumped = 0; | |
322 | list_for_each_entry(chan, &session->chan, list) { | |
323 | chan->metadata_dumped = 0; | |
324 | } | |
325 | ||
326 | list_for_each_entry(event, &session->events, list) { | |
327 | event->metadata_dumped = 0; | |
328 | } | |
329 | ||
330 | ret = _lttng_session_metadata_statedump(session); | |
331 | ||
332 | end: | |
333 | mutex_unlock(&sessions_mutex); | |
334 | return ret; | |
335 | } | |
336 | ||
a90917c3 | 337 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 338 | { |
3c997079 | 339 | int ret = 0; |
e64957da | 340 | |
3c997079 MD |
341 | mutex_lock(&sessions_mutex); |
342 | if (channel->channel_type == METADATA_CHANNEL) { | |
343 | ret = -EPERM; | |
344 | goto end; | |
345 | } | |
346 | if (channel->enabled) { | |
347 | ret = -EEXIST; | |
348 | goto end; | |
349 | } | |
350 | /* Set transient enabler state to "enabled" */ | |
351 | channel->tstate = 1; | |
352 | lttng_session_sync_enablers(channel->session); | |
353 | /* Set atomically the state to "enabled" */ | |
a8f2d0c7 | 354 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
355 | end: |
356 | mutex_unlock(&sessions_mutex); | |
357 | return ret; | |
e64957da MD |
358 | } |
359 | ||
a90917c3 | 360 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 361 | { |
3c997079 | 362 | int ret = 0; |
e64957da | 363 | |
3c997079 MD |
364 | mutex_lock(&sessions_mutex); |
365 | if (channel->channel_type == METADATA_CHANNEL) { | |
366 | ret = -EPERM; | |
367 | goto end; | |
368 | } | |
369 | if (!channel->enabled) { | |
370 | ret = -EEXIST; | |
371 | goto end; | |
372 | } | |
373 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 374 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
375 | /* Set transient enabler state to "enabled" */ |
376 | channel->tstate = 0; | |
377 | lttng_session_sync_enablers(channel->session); | |
378 | end: | |
379 | mutex_unlock(&sessions_mutex); | |
380 | return ret; | |
e64957da MD |
381 | } |
382 | ||
a90917c3 | 383 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 384 | { |
3c997079 | 385 | int ret = 0; |
e64957da | 386 | |
3c997079 MD |
387 | mutex_lock(&sessions_mutex); |
388 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
389 | ret = -EPERM; | |
390 | goto end; | |
391 | } | |
392 | if (event->enabled) { | |
393 | ret = -EEXIST; | |
394 | goto end; | |
395 | } | |
a0493bef MD |
396 | switch (event->instrumentation) { |
397 | case LTTNG_KERNEL_TRACEPOINT: | |
398 | case LTTNG_KERNEL_SYSCALL: | |
399 | ret = -EINVAL; | |
400 | break; | |
401 | case LTTNG_KERNEL_KPROBE: | |
402 | case LTTNG_KERNEL_FUNCTION: | |
149b9a9d | 403 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 404 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 405 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
406 | break; |
407 | case LTTNG_KERNEL_KRETPROBE: | |
408 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
409 | break; | |
410 | default: | |
411 | WARN_ON_ONCE(1); | |
412 | ret = -EINVAL; | |
413 | } | |
3c997079 MD |
414 | end: |
415 | mutex_unlock(&sessions_mutex); | |
416 | return ret; | |
e64957da MD |
417 | } |
418 | ||
a90917c3 | 419 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 420 | { |
3c997079 | 421 | int ret = 0; |
e64957da | 422 | |
3c997079 MD |
423 | mutex_lock(&sessions_mutex); |
424 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
425 | ret = -EPERM; | |
426 | goto end; | |
427 | } | |
428 | if (!event->enabled) { | |
429 | ret = -EEXIST; | |
430 | goto end; | |
431 | } | |
a0493bef MD |
432 | switch (event->instrumentation) { |
433 | case LTTNG_KERNEL_TRACEPOINT: | |
434 | case LTTNG_KERNEL_SYSCALL: | |
435 | ret = -EINVAL; | |
436 | break; | |
437 | case LTTNG_KERNEL_KPROBE: | |
438 | case LTTNG_KERNEL_FUNCTION: | |
149b9a9d | 439 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 440 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 441 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
442 | break; |
443 | case LTTNG_KERNEL_KRETPROBE: | |
444 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
445 | break; | |
446 | default: | |
447 | WARN_ON_ONCE(1); | |
448 | ret = -EINVAL; | |
449 | } | |
3c997079 MD |
450 | end: |
451 | mutex_unlock(&sessions_mutex); | |
452 | return ret; | |
e64957da MD |
453 | } |
454 | ||
a90917c3 | 455 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 456 | { |
a90917c3 | 457 | struct lttng_transport *transport; |
f3d01b96 | 458 | |
a90917c3 | 459 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
460 | if (!strcmp(transport->name, name)) |
461 | return transport; | |
462 | } | |
463 | return NULL; | |
464 | } | |
465 | ||
a90917c3 | 466 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
467 | const char *transport_name, |
468 | void *buf_addr, | |
4e3c1b9b MD |
469 | size_t subbuf_size, size_t num_subbuf, |
470 | unsigned int switch_timer_interval, | |
d83004aa JD |
471 | unsigned int read_timer_interval, |
472 | enum channel_type channel_type) | |
4e3c1b9b | 473 | { |
a90917c3 MD |
474 | struct lttng_channel *chan; |
475 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
476 | |
477 | mutex_lock(&sessions_mutex); | |
d83004aa | 478 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 479 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 480 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
481 | if (!transport) { |
482 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
483 | transport_name); | |
c0e31d2e | 484 | goto notransport; |
f3d01b96 | 485 | } |
a33c9927 MD |
486 | if (!try_module_get(transport->owner)) { |
487 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
488 | goto notransport; | |
489 | } | |
a90917c3 | 490 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 491 | if (!chan) |
c0e31d2e | 492 | goto nomem; |
4e3c1b9b | 493 | chan->session = session; |
05d32c64 | 494 | chan->id = session->free_chan_id++; |
3b731ab1 | 495 | chan->ops = &transport->ops; |
125b4df4 MD |
496 | /* |
497 | * Note: the channel creation op already writes into the packet | |
498 | * headers. Therefore the "chan" information used as input | |
499 | * should be already accessible. | |
500 | */ | |
5f5ddf01 MD |
501 | chan->chan = transport->ops.channel_create(transport_name, |
502 | chan, buf_addr, subbuf_size, num_subbuf, | |
503 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
504 | if (!chan->chan) |
505 | goto create_error; | |
3c997079 | 506 | chan->tstate = 1; |
e64957da | 507 | chan->enabled = 1; |
a33c9927 | 508 | chan->transport = transport; |
d83004aa | 509 | chan->channel_type = channel_type; |
4e3c1b9b MD |
510 | list_add(&chan->list, &session->chan); |
511 | mutex_unlock(&sessions_mutex); | |
512 | return chan; | |
513 | ||
f3d01b96 MD |
514 | create_error: |
515 | kfree(chan); | |
c0e31d2e | 516 | nomem: |
a33c9927 MD |
517 | if (transport) |
518 | module_put(transport->owner); | |
c0e31d2e | 519 | notransport: |
e5382b6d | 520 | active: |
4e3c1b9b MD |
521 | mutex_unlock(&sessions_mutex); |
522 | return NULL; | |
523 | } | |
524 | ||
525 | /* | |
d83004aa JD |
526 | * Only used internally at session destruction for per-cpu channels, and |
527 | * when metadata channel is released. | |
528 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 529 | */ |
aa7c23a9 | 530 | static |
a90917c3 | 531 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 532 | { |
11b5a3c2 | 533 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 534 | module_put(chan->transport->owner); |
4e3c1b9b | 535 | list_del(&chan->list); |
8070f5c0 | 536 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
537 | kfree(chan); |
538 | } | |
539 | ||
d83004aa JD |
540 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
541 | { | |
542 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
543 | ||
544 | /* Protect the metadata cache with the sessions_mutex. */ | |
545 | mutex_lock(&sessions_mutex); | |
546 | _lttng_channel_destroy(chan); | |
547 | mutex_unlock(&sessions_mutex); | |
548 | } | |
549 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
550 | ||
551 | static | |
552 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
553 | { | |
554 | stream->finalized = 1; | |
555 | wake_up_interruptible(&stream->read_wait); | |
556 | } | |
557 | ||
e5382b6d MD |
558 | /* |
559 | * Supports event creation while tracing session is active. | |
3c997079 | 560 | * Needs to be called with sessions mutex held. |
e5382b6d | 561 | */ |
3c997079 MD |
562 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
563 | struct lttng_kernel_event *event_param, | |
564 | void *filter, | |
565 | const struct lttng_event_desc *event_desc, | |
566 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 567 | { |
3c997079 | 568 | struct lttng_session *session = chan->session; |
a90917c3 | 569 | struct lttng_event *event; |
3c997079 MD |
570 | const char *event_name; |
571 | struct hlist_head *head; | |
572 | size_t name_len; | |
573 | uint32_t hash; | |
3d084699 | 574 | int ret; |
4e3c1b9b | 575 | |
abc0446a | 576 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 577 | ret = -EMFILE; |
e5382b6d | 578 | goto full; |
abc0446a | 579 | } |
3c997079 MD |
580 | |
581 | switch (itype) { | |
582 | case LTTNG_KERNEL_TRACEPOINT: | |
583 | event_name = event_desc->name; | |
584 | break; | |
585 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 586 | case LTTNG_KERNEL_UPROBE: |
3c997079 MD |
587 | case LTTNG_KERNEL_KRETPROBE: |
588 | case LTTNG_KERNEL_FUNCTION: | |
589 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 590 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
591 | event_name = event_param->name; |
592 | break; | |
593 | default: | |
594 | WARN_ON_ONCE(1); | |
595 | ret = -EINVAL; | |
596 | goto type_error; | |
597 | } | |
598 | name_len = strlen(event_name); | |
599 | hash = jhash(event_name, name_len, 0); | |
600 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 601 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
602 | WARN_ON_ONCE(!event->desc); |
603 | if (!strncmp(event->desc->name, event_name, | |
604 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
605 | && chan == event->chan) { | |
606 | ret = -EEXIST; | |
607 | goto exist; | |
abc0446a MD |
608 | } |
609 | } | |
3c997079 | 610 | |
11b5a3c2 | 611 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 612 | if (!event) { |
4cf0bf51 | 613 | ret = -ENOMEM; |
4e3c1b9b | 614 | goto cache_error; |
abc0446a | 615 | } |
4e3c1b9b MD |
616 | event->chan = chan; |
617 | event->filter = filter; | |
e5382b6d | 618 | event->id = chan->free_event_id++; |
3c997079 MD |
619 | event->instrumentation = itype; |
620 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 621 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
622 | INIT_LIST_HEAD(&event->enablers_ref_head); |
623 | ||
624 | switch (itype) { | |
ab2277d6 | 625 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
626 | /* Event will be enabled by enabler sync. */ |
627 | event->enabled = 0; | |
628 | event->registered = 0; | |
629 | event->desc = lttng_event_get(event_name); | |
abc0446a | 630 | if (!event->desc) { |
4cf0bf51 | 631 | ret = -ENOENT; |
d3dbe23c | 632 | goto register_error; |
abc0446a | 633 | } |
3c997079 MD |
634 | /* Populate lttng_event structure before event registration. */ |
635 | smp_wmb(); | |
baf20995 | 636 | break; |
ab2277d6 | 637 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
638 | /* |
639 | * Needs to be explicitly enabled after creation, since | |
640 | * we may want to apply filters. | |
641 | */ | |
642 | event->enabled = 0; | |
3c997079 MD |
643 | event->registered = 1; |
644 | /* | |
645 | * Populate lttng_event structure before event | |
646 | * registration. | |
647 | */ | |
648 | smp_wmb(); | |
649 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
650 | event_param->u.kprobe.symbol_name, |
651 | event_param->u.kprobe.offset, | |
652 | event_param->u.kprobe.addr, | |
653 | event); | |
abc0446a | 654 | if (ret) { |
4cf0bf51 | 655 | ret = -EINVAL; |
d6d808f3 | 656 | goto register_error; |
abc0446a | 657 | } |
edeb3137 MD |
658 | ret = try_module_get(event->desc->owner); |
659 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 660 | break; |
7371f44c MD |
661 | case LTTNG_KERNEL_KRETPROBE: |
662 | { | |
a90917c3 | 663 | struct lttng_event *event_return; |
7371f44c MD |
664 | |
665 | /* kretprobe defines 2 events */ | |
a0493bef MD |
666 | /* |
667 | * Needs to be explicitly enabled after creation, since | |
668 | * we may want to apply filters. | |
669 | */ | |
670 | event->enabled = 0; | |
3c997079 | 671 | event->registered = 1; |
7371f44c MD |
672 | event_return = |
673 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 674 | if (!event_return) { |
4cf0bf51 | 675 | ret = -ENOMEM; |
7371f44c | 676 | goto register_error; |
abc0446a | 677 | } |
7371f44c MD |
678 | event_return->chan = chan; |
679 | event_return->filter = filter; | |
680 | event_return->id = chan->free_event_id++; | |
a0493bef | 681 | event_return->enabled = 0; |
3c997079 MD |
682 | event_return->registered = 1; |
683 | event_return->instrumentation = itype; | |
7371f44c | 684 | /* |
a90917c3 | 685 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
686 | */ |
687 | smp_wmb(); | |
3c997079 | 688 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
689 | event_param->u.kretprobe.symbol_name, |
690 | event_param->u.kretprobe.offset, | |
691 | event_param->u.kretprobe.addr, | |
692 | event, event_return); | |
693 | if (ret) { | |
694 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 695 | ret = -EINVAL; |
7371f44c MD |
696 | goto register_error; |
697 | } | |
698 | /* Take 2 refs on the module: one per event. */ | |
699 | ret = try_module_get(event->desc->owner); | |
700 | WARN_ON_ONCE(!ret); | |
701 | ret = try_module_get(event->desc->owner); | |
702 | WARN_ON_ONCE(!ret); | |
a90917c3 | 703 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 704 | event_return); |
abc0446a | 705 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
706 | if (ret) { |
707 | kmem_cache_free(event_cache, event_return); | |
708 | module_put(event->desc->owner); | |
709 | module_put(event->desc->owner); | |
710 | goto statedump_error; | |
711 | } | |
712 | list_add(&event_return->list, &chan->session->events); | |
713 | break; | |
714 | } | |
ab2277d6 | 715 | case LTTNG_KERNEL_FUNCTION: |
a0493bef MD |
716 | /* |
717 | * Needs to be explicitly enabled after creation, since | |
718 | * we may want to apply filters. | |
719 | */ | |
720 | event->enabled = 0; | |
3c997079 MD |
721 | event->registered = 1; |
722 | /* | |
723 | * Populate lttng_event structure before event | |
724 | * registration. | |
725 | */ | |
726 | smp_wmb(); | |
727 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
728 | event_param->u.ftrace.symbol_name, |
729 | event); | |
abc0446a | 730 | if (ret) { |
e0a7a7c4 | 731 | goto register_error; |
abc0446a | 732 | } |
edeb3137 MD |
733 | ret = try_module_get(event->desc->owner); |
734 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 735 | break; |
1ec65de1 | 736 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 737 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
738 | /* |
739 | * Needs to be explicitly enabled after creation, since | |
740 | * we may want to apply filters. | |
741 | */ | |
742 | event->enabled = 0; | |
3c997079 MD |
743 | event->registered = 0; |
744 | event->desc = event_desc; | |
abc0446a | 745 | if (!event->desc) { |
4cf0bf51 | 746 | ret = -EINVAL; |
259b6cb3 | 747 | goto register_error; |
abc0446a | 748 | } |
1ec65de1 | 749 | break; |
149b9a9d | 750 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
751 | /* |
752 | * Needs to be explicitly enabled after creation, since | |
753 | * we may want to apply filters. | |
754 | */ | |
755 | event->enabled = 0; | |
756 | event->registered = 1; | |
3aed4dca | 757 | |
a344f64b FD |
758 | /* |
759 | * Populate lttng_event structure before event | |
760 | * registration. | |
761 | */ | |
762 | smp_wmb(); | |
149b9a9d YB |
763 | |
764 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 765 | event_param->u.uprobe.fd, |
149b9a9d YB |
766 | event); |
767 | if (ret) | |
768 | goto register_error; | |
769 | ret = try_module_get(event->desc->owner); | |
770 | WARN_ON_ONCE(!ret); | |
771 | break; | |
baf20995 MD |
772 | default: |
773 | WARN_ON_ONCE(1); | |
4cf0bf51 | 774 | ret = -EINVAL; |
df07930b | 775 | goto register_error; |
baf20995 | 776 | } |
a90917c3 | 777 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
778 | WARN_ON_ONCE(ret > 0); |
779 | if (ret) { | |
c099397a | 780 | goto statedump_error; |
abc0446a | 781 | } |
3c997079 | 782 | hlist_add_head(&event->hlist, head); |
dda6a249 | 783 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
784 | return event; |
785 | ||
c099397a | 786 | statedump_error: |
259b6cb3 | 787 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 788 | register_error: |
11b5a3c2 | 789 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
790 | cache_error: |
791 | exist: | |
3c997079 | 792 | type_error: |
e5382b6d | 793 | full: |
4cf0bf51 | 794 | return ERR_PTR(ret); |
4e3c1b9b MD |
795 | } |
796 | ||
3c997079 MD |
797 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
798 | struct lttng_kernel_event *event_param, | |
799 | void *filter, | |
800 | const struct lttng_event_desc *event_desc, | |
801 | enum lttng_kernel_instrumentation itype) | |
802 | { | |
803 | struct lttng_event *event; | |
804 | ||
805 | mutex_lock(&sessions_mutex); | |
806 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
807 | itype); | |
808 | mutex_unlock(&sessions_mutex); | |
809 | return event; | |
810 | } | |
811 | ||
812 | /* Only used for tracepoints for now. */ | |
813 | static | |
814 | void register_event(struct lttng_event *event) | |
815 | { | |
816 | const struct lttng_event_desc *desc; | |
f127e61e | 817 | int ret = -EINVAL; |
3c997079 | 818 | |
3c997079 MD |
819 | if (event->registered) |
820 | return; | |
4ecb5ad5 | 821 | |
3c997079 | 822 | desc = event->desc; |
4ecb5ad5 MD |
823 | switch (event->instrumentation) { |
824 | case LTTNG_KERNEL_TRACEPOINT: | |
825 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
826 | desc->probe_callback, | |
827 | event); | |
828 | break; | |
829 | case LTTNG_KERNEL_SYSCALL: | |
830 | ret = lttng_syscall_filter_enable(event->chan, | |
831 | desc->name); | |
832 | break; | |
833 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 834 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 MD |
835 | case LTTNG_KERNEL_KRETPROBE: |
836 | case LTTNG_KERNEL_FUNCTION: | |
837 | case LTTNG_KERNEL_NOOP: | |
838 | ret = 0; | |
839 | break; | |
840 | default: | |
841 | WARN_ON_ONCE(1); | |
842 | } | |
3c997079 MD |
843 | if (!ret) |
844 | event->registered = 1; | |
845 | } | |
846 | ||
4e3c1b9b MD |
847 | /* |
848 | * Only used internally at session destruction. | |
849 | */ | |
a90917c3 | 850 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 851 | { |
4ecb5ad5 | 852 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
853 | int ret = -EINVAL; |
854 | ||
3c997079 MD |
855 | if (!event->registered) |
856 | return 0; | |
857 | ||
4ecb5ad5 | 858 | desc = event->desc; |
38d024ae | 859 | switch (event->instrumentation) { |
ab2277d6 | 860 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 861 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 862 | event->desc->probe_callback, |
11b5a3c2 | 863 | event); |
baf20995 | 864 | break; |
ab2277d6 | 865 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 866 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
867 | ret = 0; |
868 | break; | |
7371f44c MD |
869 | case LTTNG_KERNEL_KRETPROBE: |
870 | lttng_kretprobes_unregister(event); | |
871 | ret = 0; | |
872 | break; | |
ab2277d6 | 873 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
874 | lttng_ftrace_unregister(event); |
875 | ret = 0; | |
876 | break; | |
33a39a3c | 877 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
878 | ret = lttng_syscall_filter_disable(event->chan, |
879 | desc->name); | |
880 | break; | |
881 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
882 | ret = 0; |
883 | break; | |
149b9a9d YB |
884 | case LTTNG_KERNEL_UPROBE: |
885 | lttng_uprobes_unregister(event); | |
886 | ret = 0; | |
887 | break; | |
baf20995 MD |
888 | default: |
889 | WARN_ON_ONCE(1); | |
890 | } | |
3c997079 MD |
891 | if (!ret) |
892 | event->registered = 0; | |
dda6a249 MD |
893 | return ret; |
894 | } | |
895 | ||
896 | /* | |
897 | * Only used internally at session destruction. | |
898 | */ | |
be066e6c | 899 | static |
a90917c3 | 900 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 901 | { |
edeb3137 MD |
902 | switch (event->instrumentation) { |
903 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 904 | lttng_event_put(event->desc); |
edeb3137 MD |
905 | break; |
906 | case LTTNG_KERNEL_KPROBE: | |
907 | module_put(event->desc->owner); | |
908 | lttng_kprobes_destroy_private(event); | |
909 | break; | |
7371f44c MD |
910 | case LTTNG_KERNEL_KRETPROBE: |
911 | module_put(event->desc->owner); | |
912 | lttng_kretprobes_destroy_private(event); | |
913 | break; | |
edeb3137 MD |
914 | case LTTNG_KERNEL_FUNCTION: |
915 | module_put(event->desc->owner); | |
916 | lttng_ftrace_destroy_private(event); | |
917 | break; | |
259b6cb3 | 918 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 919 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 920 | break; |
149b9a9d YB |
921 | case LTTNG_KERNEL_UPROBE: |
922 | module_put(event->desc->owner); | |
923 | lttng_uprobes_destroy_private(event); | |
924 | break; | |
edeb3137 MD |
925 | default: |
926 | WARN_ON_ONCE(1); | |
927 | } | |
dda6a249 | 928 | list_del(&event->list); |
8070f5c0 | 929 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 930 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
931 | } |
932 | ||
e0130fab MD |
933 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
934 | { | |
935 | int ret; | |
936 | ||
937 | if (pid < -1) | |
938 | return -EINVAL; | |
939 | mutex_lock(&sessions_mutex); | |
940 | if (pid == -1) { | |
941 | /* track all pids: destroy tracker. */ | |
942 | if (session->pid_tracker) { | |
943 | struct lttng_pid_tracker *lpf; | |
944 | ||
945 | lpf = session->pid_tracker; | |
946 | rcu_assign_pointer(session->pid_tracker, NULL); | |
947 | synchronize_trace(); | |
948 | lttng_pid_tracker_destroy(lpf); | |
949 | } | |
950 | ret = 0; | |
951 | } else { | |
952 | if (!session->pid_tracker) { | |
953 | struct lttng_pid_tracker *lpf; | |
954 | ||
955 | lpf = lttng_pid_tracker_create(); | |
956 | if (!lpf) { | |
957 | ret = -ENOMEM; | |
958 | goto unlock; | |
959 | } | |
960 | ret = lttng_pid_tracker_add(lpf, pid); | |
961 | rcu_assign_pointer(session->pid_tracker, lpf); | |
962 | } else { | |
963 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
964 | } | |
965 | } | |
966 | unlock: | |
967 | mutex_unlock(&sessions_mutex); | |
968 | return ret; | |
969 | } | |
970 | ||
971 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
972 | { | |
973 | int ret; | |
974 | ||
975 | if (pid < -1) | |
976 | return -EINVAL; | |
977 | mutex_lock(&sessions_mutex); | |
978 | if (pid == -1) { | |
979 | /* untrack all pids: replace by empty tracker. */ | |
980 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
981 | struct lttng_pid_tracker *lpf; | |
982 | ||
983 | lpf = lttng_pid_tracker_create(); | |
984 | if (!lpf) { | |
985 | ret = -ENOMEM; | |
986 | goto unlock; | |
987 | } | |
988 | rcu_assign_pointer(session->pid_tracker, lpf); | |
989 | synchronize_trace(); | |
990 | if (old_lpf) | |
991 | lttng_pid_tracker_destroy(old_lpf); | |
992 | ret = 0; | |
993 | } else { | |
994 | if (!session->pid_tracker) { | |
995 | ret = -ENOENT; | |
996 | goto unlock; | |
997 | } | |
998 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
999 | } | |
1000 | unlock: | |
1001 | mutex_unlock(&sessions_mutex); | |
1002 | return ret; | |
1003 | } | |
1004 | ||
7e6f9ef6 MD |
1005 | static |
1006 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
1007 | { | |
1008 | struct lttng_session *session = m->private; | |
1009 | struct lttng_pid_tracker *lpf; | |
1010 | struct lttng_pid_hash_node *e; | |
1011 | int iter = 0, i; | |
1012 | ||
1013 | mutex_lock(&sessions_mutex); | |
1014 | lpf = session->pid_tracker; | |
1015 | if (lpf) { | |
1016 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1017 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1018 | ||
f934e302 | 1019 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1020 | if (iter++ >= *pos) |
1021 | return e; | |
1022 | } | |
1023 | } | |
1024 | } else { | |
1025 | /* PID tracker disabled. */ | |
1026 | if (iter >= *pos && iter == 0) { | |
1027 | return session; /* empty tracker */ | |
1028 | } | |
1029 | iter++; | |
1030 | } | |
1031 | /* End of list */ | |
1032 | return NULL; | |
1033 | } | |
1034 | ||
1035 | /* Called with sessions_mutex held. */ | |
1036 | static | |
1037 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1038 | { | |
1039 | struct lttng_session *session = m->private; | |
1040 | struct lttng_pid_tracker *lpf; | |
1041 | struct lttng_pid_hash_node *e; | |
1042 | int iter = 0, i; | |
1043 | ||
1044 | (*ppos)++; | |
1045 | lpf = session->pid_tracker; | |
1046 | if (lpf) { | |
1047 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1048 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1049 | ||
f934e302 | 1050 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1051 | if (iter++ >= *ppos) |
1052 | return e; | |
1053 | } | |
1054 | } | |
1055 | } else { | |
1056 | /* PID tracker disabled. */ | |
1057 | if (iter >= *ppos && iter == 0) | |
1058 | return session; /* empty tracker */ | |
1059 | iter++; | |
1060 | } | |
1061 | ||
1062 | /* End of list */ | |
1063 | return NULL; | |
1064 | } | |
1065 | ||
1066 | static | |
1067 | void pid_list_stop(struct seq_file *m, void *p) | |
1068 | { | |
1069 | mutex_unlock(&sessions_mutex); | |
1070 | } | |
1071 | ||
1072 | static | |
1073 | int pid_list_show(struct seq_file *m, void *p) | |
1074 | { | |
1075 | int pid; | |
1076 | ||
1077 | if (p == m->private) { | |
1078 | /* Tracker disabled. */ | |
1079 | pid = -1; | |
1080 | } else { | |
1081 | const struct lttng_pid_hash_node *e = p; | |
1082 | ||
1083 | pid = lttng_pid_tracker_get_node_pid(e); | |
1084 | } | |
1085 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1086 | return 0; | |
1087 | } | |
1088 | ||
1089 | static | |
1090 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1091 | .start = pid_list_start, | |
1092 | .next = pid_list_next, | |
1093 | .stop = pid_list_stop, | |
1094 | .show = pid_list_show, | |
1095 | }; | |
1096 | ||
1097 | static | |
1098 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1099 | { | |
1100 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1101 | } | |
1102 | ||
1103 | static | |
1104 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1105 | { | |
1106 | struct seq_file *m = file->private_data; | |
1107 | struct lttng_session *session = m->private; | |
1108 | int ret; | |
1109 | ||
1110 | WARN_ON_ONCE(!session); | |
1111 | ret = seq_release(inode, file); | |
1112 | if (!ret && session) | |
1113 | fput(session->file); | |
1114 | return ret; | |
1115 | } | |
1116 | ||
1117 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1118 | .owner = THIS_MODULE, | |
1119 | .open = lttng_tracker_pids_list_open, | |
1120 | .read = seq_read, | |
1121 | .llseek = seq_lseek, | |
1122 | .release = lttng_tracker_pids_list_release, | |
1123 | }; | |
1124 | ||
1125 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1126 | { | |
1127 | struct file *tracker_pids_list_file; | |
1128 | struct seq_file *m; | |
1129 | int file_fd, ret; | |
1130 | ||
1131 | file_fd = lttng_get_unused_fd(); | |
1132 | if (file_fd < 0) { | |
1133 | ret = file_fd; | |
1134 | goto fd_error; | |
1135 | } | |
1136 | ||
1137 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1138 | <tng_tracker_pids_list_fops, | |
1139 | NULL, O_RDWR); | |
1140 | if (IS_ERR(tracker_pids_list_file)) { | |
1141 | ret = PTR_ERR(tracker_pids_list_file); | |
1142 | goto file_error; | |
1143 | } | |
5ad19305 MJ |
1144 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1145 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1146 | goto refcount_error; |
1147 | } | |
7e6f9ef6 MD |
1148 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1149 | if (ret < 0) | |
1150 | goto open_error; | |
1151 | m = tracker_pids_list_file->private_data; | |
1152 | m->private = session; | |
1153 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1154 | |
1155 | return file_fd; | |
1156 | ||
1157 | open_error: | |
9c1f4643 MD |
1158 | atomic_long_dec(&session->file->f_count); |
1159 | refcount_error: | |
7e6f9ef6 MD |
1160 | fput(tracker_pids_list_file); |
1161 | file_error: | |
1162 | put_unused_fd(file_fd); | |
1163 | fd_error: | |
1164 | return ret; | |
1165 | } | |
1166 | ||
3c997079 MD |
1167 | /* |
1168 | * Enabler management. | |
1169 | */ | |
1170 | static | |
4993071a PP |
1171 | int lttng_match_enabler_star_glob(const char *desc_name, |
1172 | const char *pattern) | |
3c997079 | 1173 | { |
cbc19040 MD |
1174 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1175 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1176 | return 0; |
1177 | return 1; | |
1178 | } | |
1179 | ||
1180 | static | |
4ecb5ad5 MD |
1181 | int lttng_match_enabler_name(const char *desc_name, |
1182 | const char *name) | |
3c997079 | 1183 | { |
4ecb5ad5 | 1184 | if (strcmp(desc_name, name)) |
3c997079 MD |
1185 | return 0; |
1186 | return 1; | |
1187 | } | |
1188 | ||
1189 | static | |
1190 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1191 | struct lttng_enabler *enabler) | |
1192 | { | |
4ecb5ad5 MD |
1193 | const char *desc_name, *enabler_name; |
1194 | ||
1195 | enabler_name = enabler->event_param.name; | |
1196 | switch (enabler->event_param.instrumentation) { | |
1197 | case LTTNG_KERNEL_TRACEPOINT: | |
1198 | desc_name = desc->name; | |
1199 | break; | |
1200 | case LTTNG_KERNEL_SYSCALL: | |
1201 | desc_name = desc->name; | |
1202 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1203 | desc_name += strlen("compat_"); | |
1204 | if (!strncmp(desc_name, "syscall_exit_", | |
1205 | strlen("syscall_exit_"))) { | |
1206 | desc_name += strlen("syscall_exit_"); | |
1207 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1208 | strlen("syscall_entry_"))) { | |
1209 | desc_name += strlen("syscall_entry_"); | |
1210 | } else { | |
1211 | WARN_ON_ONCE(1); | |
1212 | return -EINVAL; | |
1213 | } | |
1214 | break; | |
1215 | default: | |
1216 | WARN_ON_ONCE(1); | |
1217 | return -EINVAL; | |
1218 | } | |
3c997079 | 1219 | switch (enabler->type) { |
4993071a PP |
1220 | case LTTNG_ENABLER_STAR_GLOB: |
1221 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
3c997079 | 1222 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1223 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1224 | default: |
1225 | return -EINVAL; | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | static | |
1230 | int lttng_event_match_enabler(struct lttng_event *event, | |
1231 | struct lttng_enabler *enabler) | |
1232 | { | |
33a39a3c MD |
1233 | if (enabler->event_param.instrumentation != event->instrumentation) |
1234 | return 0; | |
3c997079 MD |
1235 | if (lttng_desc_match_enabler(event->desc, enabler) |
1236 | && event->chan == enabler->chan) | |
1237 | return 1; | |
1238 | else | |
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | static | |
1243 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1244 | struct lttng_enabler *enabler) | |
1245 | { | |
1246 | struct lttng_enabler_ref *enabler_ref; | |
1247 | ||
1248 | list_for_each_entry(enabler_ref, | |
1249 | &event->enablers_ref_head, node) { | |
1250 | if (enabler_ref->ref == enabler) | |
1251 | return enabler_ref; | |
1252 | } | |
1253 | return NULL; | |
1254 | } | |
1255 | ||
3c997079 | 1256 | static |
33a39a3c | 1257 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1258 | { |
1259 | struct lttng_session *session = enabler->chan->session; | |
1260 | struct lttng_probe_desc *probe_desc; | |
1261 | const struct lttng_event_desc *desc; | |
1262 | int i; | |
1263 | struct list_head *probe_list; | |
1264 | ||
1265 | probe_list = lttng_get_probe_list_head(); | |
1266 | /* | |
1267 | * For each probe event, if we find that a probe event matches | |
1268 | * our enabler, create an associated lttng_event if not | |
1269 | * already present. | |
1270 | */ | |
1271 | list_for_each_entry(probe_desc, probe_list, head) { | |
1272 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1273 | int found = 0; | |
1274 | struct hlist_head *head; | |
1275 | const char *event_name; | |
1276 | size_t name_len; | |
1277 | uint32_t hash; | |
1278 | struct lttng_event *event; | |
1279 | ||
1280 | desc = probe_desc->event_desc[i]; | |
1281 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1282 | continue; | |
1283 | event_name = desc->name; | |
1284 | name_len = strlen(event_name); | |
1285 | ||
1286 | /* | |
1287 | * Check if already created. | |
1288 | */ | |
1289 | hash = jhash(event_name, name_len, 0); | |
1290 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1291 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1292 | if (event->desc == desc |
1293 | && event->chan == enabler->chan) | |
1294 | found = 1; | |
1295 | } | |
1296 | if (found) | |
1297 | continue; | |
1298 | ||
1299 | /* | |
1300 | * We need to create an event for this | |
1301 | * event probe. | |
1302 | */ | |
1303 | event = _lttng_event_create(enabler->chan, | |
1304 | NULL, NULL, desc, | |
1305 | LTTNG_KERNEL_TRACEPOINT); | |
1306 | if (!event) { | |
1307 | printk(KERN_INFO "Unable to create event %s\n", | |
1308 | probe_desc->event_desc[i]->name); | |
1309 | } | |
1310 | } | |
1311 | } | |
1312 | } | |
1313 | ||
33a39a3c MD |
1314 | static |
1315 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1316 | { | |
1317 | int ret; | |
1318 | ||
1319 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1320 | WARN_ON_ONCE(ret); | |
1321 | } | |
1322 | ||
1323 | /* | |
1324 | * Create struct lttng_event if it is missing and present in the list of | |
1325 | * tracepoint probes. | |
1326 | * Should be called with sessions mutex held. | |
1327 | */ | |
1328 | static | |
1329 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1330 | { | |
1331 | switch (enabler->event_param.instrumentation) { | |
1332 | case LTTNG_KERNEL_TRACEPOINT: | |
1333 | lttng_create_tracepoint_if_missing(enabler); | |
1334 | break; | |
1335 | case LTTNG_KERNEL_SYSCALL: | |
1336 | lttng_create_syscall_if_missing(enabler); | |
1337 | break; | |
1338 | default: | |
1339 | WARN_ON_ONCE(1); | |
1340 | break; | |
1341 | } | |
1342 | } | |
1343 | ||
3c997079 MD |
1344 | /* |
1345 | * Create events associated with an enabler (if not already present), | |
1346 | * and add backward reference from the event to the enabler. | |
1347 | * Should be called with sessions mutex held. | |
1348 | */ | |
1349 | static | |
1350 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1351 | { | |
1352 | struct lttng_session *session = enabler->chan->session; | |
1353 | struct lttng_event *event; | |
1354 | ||
1355 | /* First ensure that probe events are created for this enabler. */ | |
1356 | lttng_create_event_if_missing(enabler); | |
1357 | ||
1358 | /* For each event matching enabler in session event list. */ | |
1359 | list_for_each_entry(event, &session->events, list) { | |
1360 | struct lttng_enabler_ref *enabler_ref; | |
1361 | ||
1362 | if (!lttng_event_match_enabler(event, enabler)) | |
1363 | continue; | |
1364 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1365 | if (!enabler_ref) { | |
1366 | /* | |
1367 | * If no backward ref, create it. | |
1368 | * Add backward ref from event to enabler. | |
1369 | */ | |
1370 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1371 | if (!enabler_ref) | |
1372 | return -ENOMEM; | |
1373 | enabler_ref->ref = enabler; | |
1374 | list_add(&enabler_ref->node, | |
1375 | &event->enablers_ref_head); | |
1376 | } | |
1377 | ||
f127e61e MD |
1378 | /* |
1379 | * Link filter bytecodes if not linked yet. | |
1380 | */ | |
1381 | lttng_enabler_event_link_bytecode(event, enabler); | |
1382 | ||
3c997079 MD |
1383 | /* TODO: merge event context. */ |
1384 | } | |
1385 | return 0; | |
1386 | } | |
1387 | ||
1388 | /* | |
1389 | * Called at module load: connect the probe on all enablers matching | |
1390 | * this event. | |
1391 | * Called with sessions lock held. | |
1392 | */ | |
1393 | int lttng_fix_pending_events(void) | |
1394 | { | |
1395 | struct lttng_session *session; | |
1396 | ||
1397 | list_for_each_entry(session, &sessions, list) | |
1398 | lttng_session_lazy_sync_enablers(session); | |
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1403 | struct lttng_kernel_event *event_param, | |
1404 | struct lttng_channel *chan) | |
1405 | { | |
1406 | struct lttng_enabler *enabler; | |
1407 | ||
1408 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1409 | if (!enabler) | |
1410 | return NULL; | |
1411 | enabler->type = type; | |
07dfc1d0 | 1412 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1413 | memcpy(&enabler->event_param, event_param, |
1414 | sizeof(enabler->event_param)); | |
1415 | enabler->chan = chan; | |
1416 | /* ctx left NULL */ | |
4fd19d8a | 1417 | enabler->enabled = 0; |
3c997079 MD |
1418 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1419 | mutex_lock(&sessions_mutex); | |
1420 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1421 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1422 | mutex_unlock(&sessions_mutex); | |
1423 | return enabler; | |
1424 | } | |
1425 | ||
1426 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1427 | { | |
1428 | mutex_lock(&sessions_mutex); | |
1429 | enabler->enabled = 1; | |
1430 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1431 | mutex_unlock(&sessions_mutex); | |
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1436 | { | |
1437 | mutex_lock(&sessions_mutex); | |
1438 | enabler->enabled = 0; | |
1439 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1440 | mutex_unlock(&sessions_mutex); | |
1441 | return 0; | |
1442 | } | |
1443 | ||
07dfc1d0 MD |
1444 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1445 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1446 | { | |
1447 | struct lttng_filter_bytecode_node *bytecode_node; | |
1448 | uint32_t bytecode_len; | |
1449 | int ret; | |
1450 | ||
1451 | ret = get_user(bytecode_len, &bytecode->len); | |
1452 | if (ret) | |
1453 | return ret; | |
1454 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1455 | GFP_KERNEL); | |
1456 | if (!bytecode_node) | |
1457 | return -ENOMEM; | |
1458 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1459 | sizeof(*bytecode) + bytecode_len); | |
1460 | if (ret) | |
1461 | goto error_free; | |
1462 | bytecode_node->enabler = enabler; | |
1463 | /* Enforce length based on allocated size */ | |
1464 | bytecode_node->bc.len = bytecode_len; | |
1465 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1466 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1467 | return 0; | |
1468 | ||
1469 | error_free: | |
1470 | kfree(bytecode_node); | |
1471 | return ret; | |
1472 | } | |
1473 | ||
3aed4dca FD |
1474 | int lttng_event_add_callsite(struct lttng_event *event, |
1475 | struct lttng_kernel_event_callsite __user *callsite) | |
1476 | { | |
1477 | ||
1478 | switch (event->instrumentation) { | |
1479 | case LTTNG_KERNEL_UPROBE: | |
1480 | return lttng_uprobes_add_callsite(event, callsite); | |
1481 | default: | |
1482 | return -EINVAL; | |
1483 | } | |
1484 | } | |
1485 | ||
3c997079 MD |
1486 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1487 | struct lttng_kernel_context *context_param) | |
1488 | { | |
1489 | return -ENOSYS; | |
1490 | } | |
1491 | ||
1492 | static | |
1493 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1494 | { | |
07dfc1d0 MD |
1495 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1496 | ||
1497 | /* Destroy filter bytecode */ | |
1498 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1499 | &enabler->filter_bytecode_head, node) { | |
1500 | kfree(filter_node); | |
1501 | } | |
1502 | ||
3c997079 MD |
1503 | /* Destroy contexts */ |
1504 | lttng_destroy_context(enabler->ctx); | |
1505 | ||
1506 | list_del(&enabler->node); | |
1507 | kfree(enabler); | |
1508 | } | |
1509 | ||
1510 | /* | |
1511 | * lttng_session_sync_enablers should be called just before starting a | |
1512 | * session. | |
1513 | * Should be called with sessions mutex held. | |
1514 | */ | |
1515 | static | |
1516 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1517 | { | |
1518 | struct lttng_enabler *enabler; | |
1519 | struct lttng_event *event; | |
1520 | ||
1521 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1522 | lttng_enabler_ref_events(enabler); | |
1523 | /* | |
1524 | * For each event, if at least one of its enablers is enabled, | |
1525 | * and its channel and session transient states are enabled, we | |
1526 | * enable the event, else we disable it. | |
1527 | */ | |
1528 | list_for_each_entry(event, &session->events, list) { | |
1529 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1530 | struct lttng_bytecode_runtime *runtime; |
1531 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1532 | |
4ecb5ad5 MD |
1533 | switch (event->instrumentation) { |
1534 | case LTTNG_KERNEL_TRACEPOINT: | |
1535 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1536 | /* Enable events */ |
1537 | list_for_each_entry(enabler_ref, | |
1538 | &event->enablers_ref_head, node) { | |
1539 | if (enabler_ref->ref->enabled) { | |
1540 | enabled = 1; | |
1541 | break; | |
1542 | } | |
1543 | } | |
4ecb5ad5 MD |
1544 | break; |
1545 | default: | |
3c997079 MD |
1546 | /* Not handled with lazy sync. */ |
1547 | continue; | |
1548 | } | |
1549 | /* | |
1550 | * Enabled state is based on union of enablers, with | |
1551 | * intesection of session and channel transient enable | |
1552 | * states. | |
1553 | */ | |
1554 | enabled = enabled && session->tstate && event->chan->tstate; | |
1555 | ||
a8f2d0c7 | 1556 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1557 | /* |
1558 | * Sync tracepoint registration with event enabled | |
1559 | * state. | |
1560 | */ | |
1561 | if (enabled) { | |
1562 | register_event(event); | |
1563 | } else { | |
1564 | _lttng_event_unregister(event); | |
1565 | } | |
07dfc1d0 MD |
1566 | |
1567 | /* Check if has enablers without bytecode enabled */ | |
1568 | list_for_each_entry(enabler_ref, | |
1569 | &event->enablers_ref_head, node) { | |
1570 | if (enabler_ref->ref->enabled | |
1571 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1572 | has_enablers_without_bytecode = 1; | |
1573 | break; | |
1574 | } | |
1575 | } | |
1576 | event->has_enablers_without_bytecode = | |
1577 | has_enablers_without_bytecode; | |
1578 | ||
1579 | /* Enable filters */ | |
1580 | list_for_each_entry(runtime, | |
f127e61e | 1581 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1582 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1583 | } |
1584 | } | |
1585 | ||
1586 | /* | |
1587 | * Apply enablers to session events, adding events to session if need | |
1588 | * be. It is required after each modification applied to an active | |
1589 | * session, and right before session "start". | |
1590 | * "lazy" sync means we only sync if required. | |
1591 | * Should be called with sessions mutex held. | |
1592 | */ | |
1593 | static | |
1594 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1595 | { | |
1596 | /* We can skip if session is not active */ | |
1597 | if (!session->active) | |
1598 | return; | |
1599 | lttng_session_sync_enablers(session); | |
1600 | } | |
1601 | ||
1ec3f75a | 1602 | /* |
d83004aa JD |
1603 | * Serialize at most one packet worth of metadata into a metadata |
1604 | * channel. | |
92d9f5e6 MD |
1605 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1606 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1607 | * allows us to do racy operations such as looking for remaining space left in | |
1608 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1609 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1610 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1611 | * Returns the number of bytes written in the channel, 0 if no data |
1612 | * was written and a negative value on error. | |
1ec3f75a | 1613 | */ |
b3b8072b MD |
1614 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1615 | struct channel *chan) | |
d83004aa JD |
1616 | { |
1617 | struct lib_ring_buffer_ctx ctx; | |
1618 | int ret = 0; | |
1619 | size_t len, reserve_len; | |
1620 | ||
f613e3e6 | 1621 | /* |
92d9f5e6 MD |
1622 | * Ensure we support mutiple get_next / put sequences followed by |
1623 | * put_next. The metadata cache lock protects reading the metadata | |
1624 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1625 | * "flush" operations on the buffer invoked by different processes. | |
1626 | * Moreover, since the metadata cache memory can be reallocated, we | |
1627 | * need to have exclusive access against updates even though we only | |
1628 | * read it. | |
f613e3e6 | 1629 | */ |
92d9f5e6 | 1630 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1631 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1632 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1633 | goto end; |
f613e3e6 | 1634 | |
9616f0bf JD |
1635 | /* Metadata regenerated, change the version. */ |
1636 | if (stream->metadata_cache->version != stream->version) | |
1637 | stream->version = stream->metadata_cache->version; | |
1638 | ||
d83004aa | 1639 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1640 | stream->metadata_in; |
9de2c215 | 1641 | if (!len) |
de23d59d | 1642 | goto end; |
d83004aa | 1643 | reserve_len = min_t(size_t, |
b3b8072b | 1644 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1645 | len); |
b3b8072b | 1646 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1647 | sizeof(char), -1); |
1648 | /* | |
1649 | * If reservation failed, return an error to the caller. | |
1650 | */ | |
b3b8072b | 1651 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1652 | if (ret != 0) { |
1653 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1654 | goto end; | |
1655 | } | |
b3b8072b | 1656 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1657 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1658 | reserve_len); |
b3b8072b | 1659 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1660 | stream->metadata_in += reserve_len; |
d83004aa JD |
1661 | ret = reserve_len; |
1662 | ||
1663 | end: | |
92d9f5e6 | 1664 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1665 | return ret; |
1666 | } | |
1667 | ||
1668 | /* | |
1669 | * Write the metadata to the metadata cache. | |
1670 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1671 | * The metadata cache lock protects us from concurrent read access from |
1672 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1673 | */ |
a90917c3 | 1674 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1675 | const char *fmt, ...) |
1676 | { | |
c099397a | 1677 | char *str; |
d83004aa | 1678 | size_t len; |
c099397a | 1679 | va_list ap; |
d83004aa | 1680 | struct lttng_metadata_stream *stream; |
c099397a | 1681 | |
a8f2d0c7 | 1682 | WARN_ON_ONCE(!READ_ONCE(session->active)); |
c099397a MD |
1683 | |
1684 | va_start(ap, fmt); | |
1685 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1686 | va_end(ap); | |
1687 | if (!str) | |
1688 | return -ENOMEM; | |
1689 | ||
1ec3f75a | 1690 | len = strlen(str); |
92d9f5e6 | 1691 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1692 | if (session->metadata_cache->metadata_written + len > |
1693 | session->metadata_cache->cache_alloc) { | |
1694 | char *tmp_cache_realloc; | |
1695 | unsigned int tmp_cache_alloc_size; | |
1696 | ||
1697 | tmp_cache_alloc_size = max_t(unsigned int, | |
1698 | session->metadata_cache->cache_alloc + len, | |
1699 | session->metadata_cache->cache_alloc << 1); | |
f6da044f | 1700 | tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1701 | if (!tmp_cache_realloc) |
1702 | goto err; | |
a606b6e8 ML |
1703 | if (session->metadata_cache->data) { |
1704 | memcpy(tmp_cache_realloc, | |
1705 | session->metadata_cache->data, | |
1706 | session->metadata_cache->cache_alloc); | |
1707 | vfree(session->metadata_cache->data); | |
1708 | } | |
1709 | ||
d83004aa JD |
1710 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1711 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1712 | } |
d83004aa JD |
1713 | memcpy(session->metadata_cache->data + |
1714 | session->metadata_cache->metadata_written, | |
1715 | str, len); | |
1716 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1717 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1718 | kfree(str); |
d83004aa JD |
1719 | |
1720 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1721 | wake_up_interruptible(&stream->read_wait); | |
1722 | ||
1723 | return 0; | |
1724 | ||
1725 | err: | |
92d9f5e6 | 1726 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1727 | kfree(str); |
1728 | return -ENOMEM; | |
c099397a MD |
1729 | } |
1730 | ||
f513b2bf MD |
1731 | static |
1732 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1733 | { | |
1734 | size_t i; | |
1735 | ||
1736 | for (i = 0; i < nesting; i++) { | |
1737 | int ret; | |
1738 | ||
1739 | ret = lttng_metadata_printf(session, " "); | |
1740 | if (ret) { | |
1741 | return ret; | |
1742 | } | |
1743 | } | |
1744 | return 0; | |
1745 | } | |
1746 | ||
1747 | /* | |
1748 | * Must be called with sessions_mutex held. | |
1749 | */ | |
1750 | static | |
1751 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1752 | const struct lttng_type *type, | |
1753 | size_t nesting) | |
1754 | { | |
1755 | int ret; | |
1756 | uint32_t i, nr_fields; | |
1757 | ||
1758 | ret = print_tabs(session, nesting); | |
1759 | if (ret) | |
1760 | return ret; | |
1761 | ret = lttng_metadata_printf(session, | |
1762 | "struct {\n"); | |
1763 | if (ret) | |
1764 | return ret; | |
1765 | nr_fields = type->u._struct.nr_fields; | |
1766 | for (i = 0; i < nr_fields; i++) { | |
1767 | const struct lttng_event_field *iter_field; | |
1768 | ||
1769 | iter_field = &type->u._struct.fields[i]; | |
1770 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1771 | if (ret) | |
1772 | return ret; | |
1773 | } | |
1774 | ret = print_tabs(session, nesting); | |
1775 | if (ret) | |
1776 | return ret; | |
1777 | ret = lttng_metadata_printf(session, | |
1778 | "}"); | |
1779 | return ret; | |
1780 | } | |
1781 | ||
1782 | /* | |
1783 | * Must be called with sessions_mutex held. | |
1784 | */ | |
1785 | static | |
1786 | int _lttng_struct_statedump(struct lttng_session *session, | |
1787 | const struct lttng_event_field *field, | |
1788 | size_t nesting) | |
1789 | { | |
1790 | int ret; | |
1791 | ||
1792 | ret = _lttng_struct_type_statedump(session, | |
1793 | &field->type, nesting); | |
1794 | if (ret) | |
1795 | return ret; | |
1796 | ret = lttng_metadata_printf(session, | |
1797 | "_%s;\n", | |
1798 | field->name); | |
1799 | return ret; | |
1800 | } | |
1801 | ||
65c85aa6 MD |
1802 | /* |
1803 | * Must be called with sessions_mutex held. | |
1804 | */ | |
1805 | static | |
1806 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1807 | const struct lttng_type *type, | |
1808 | size_t nesting) | |
1809 | { | |
1810 | int ret; | |
1811 | uint32_t i, nr_choices; | |
1812 | ||
1813 | ret = print_tabs(session, nesting); | |
1814 | if (ret) | |
1815 | return ret; | |
1816 | ret = lttng_metadata_printf(session, | |
1817 | "variant <_%s> {\n", | |
1818 | type->u.variant.tag_name); | |
1819 | if (ret) | |
1820 | return ret; | |
1821 | nr_choices = type->u.variant.nr_choices; | |
1822 | for (i = 0; i < nr_choices; i++) { | |
1823 | const struct lttng_event_field *iter_field; | |
1824 | ||
1825 | iter_field = &type->u.variant.choices[i]; | |
1826 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1827 | if (ret) | |
1828 | return ret; | |
1829 | } | |
1830 | ret = print_tabs(session, nesting); | |
1831 | if (ret) | |
1832 | return ret; | |
1833 | ret = lttng_metadata_printf(session, | |
1834 | "}"); | |
1835 | return ret; | |
1836 | } | |
1837 | ||
1838 | /* | |
1839 | * Must be called with sessions_mutex held. | |
1840 | */ | |
1841 | static | |
1842 | int _lttng_variant_statedump(struct lttng_session *session, | |
1843 | const struct lttng_event_field *field, | |
1844 | size_t nesting) | |
1845 | { | |
1846 | int ret; | |
1847 | ||
1848 | ret = _lttng_variant_type_statedump(session, | |
1849 | &field->type, nesting); | |
1850 | if (ret) | |
1851 | return ret; | |
1852 | ret = lttng_metadata_printf(session, | |
1853 | "_%s;\n", | |
1854 | field->name); | |
1855 | return ret; | |
1856 | } | |
1857 | ||
f513b2bf MD |
1858 | /* |
1859 | * Must be called with sessions_mutex held. | |
1860 | */ | |
1861 | static | |
1862 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
1863 | const struct lttng_event_field *field, | |
1864 | size_t nesting) | |
1865 | { | |
1866 | int ret; | |
1867 | const struct lttng_type *elem_type; | |
1868 | ||
65c85aa6 | 1869 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1870 | elem_type = field->type.u.array_compound.elem_type; |
1871 | switch (elem_type->atype) { | |
1872 | case atype_struct: | |
1873 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1874 | if (ret) | |
1875 | return ret; | |
1876 | break; | |
65c85aa6 MD |
1877 | case atype_variant: |
1878 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1879 | if (ret) | |
1880 | return ret; | |
1881 | break; | |
f513b2bf MD |
1882 | default: |
1883 | return -EINVAL; | |
1884 | } | |
1885 | ret = lttng_metadata_printf(session, | |
1886 | " _%s[%u];\n", | |
1887 | field->name, | |
1888 | field->type.u.array_compound.length); | |
1889 | return ret; | |
1890 | } | |
1891 | ||
1892 | /* | |
1893 | * Must be called with sessions_mutex held. | |
1894 | */ | |
1895 | static | |
1896 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
1897 | const struct lttng_event_field *field, | |
1898 | size_t nesting) | |
1899 | { | |
1900 | int ret; | |
1901 | const char *length_name; | |
1902 | const struct lttng_type *elem_type; | |
1903 | ||
1904 | length_name = field->type.u.sequence_compound.length_name; | |
1905 | ||
65c85aa6 | 1906 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1907 | elem_type = field->type.u.sequence_compound.elem_type; |
1908 | switch (elem_type->atype) { | |
1909 | case atype_struct: | |
1910 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1911 | if (ret) | |
1912 | return ret; | |
1913 | break; | |
65c85aa6 MD |
1914 | case atype_variant: |
1915 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1916 | if (ret) | |
1917 | return ret; | |
1918 | break; | |
f513b2bf MD |
1919 | default: |
1920 | return -EINVAL; | |
1921 | } | |
1922 | ret = lttng_metadata_printf(session, | |
1923 | " _%s[ _%s ];\n", | |
1924 | field->name, | |
1925 | length_name); | |
1926 | return ret; | |
1927 | } | |
1928 | ||
141ddf28 MD |
1929 | /* |
1930 | * Must be called with sessions_mutex held. | |
1931 | */ | |
1932 | static | |
1933 | int _lttng_enum_statedump(struct lttng_session *session, | |
1934 | const struct lttng_event_field *field, | |
1935 | size_t nesting) | |
1936 | { | |
1937 | const struct lttng_enum_desc *enum_desc; | |
1938 | const struct lttng_integer_type *container_type; | |
1939 | int ret; | |
1940 | unsigned int i, nr_entries; | |
1941 | ||
1942 | enum_desc = field->type.u.basic.enumeration.desc; | |
1943 | container_type = &field->type.u.basic.enumeration.container_type; | |
1944 | nr_entries = enum_desc->nr_entries; | |
1945 | ||
1946 | ret = print_tabs(session, nesting); | |
1947 | if (ret) | |
1948 | goto end; | |
1949 | ret = lttng_metadata_printf(session, | |
578e68ec | 1950 | "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n", |
141ddf28 MD |
1951 | container_type->size, |
1952 | container_type->alignment, | |
1953 | container_type->signedness, | |
1954 | (container_type->encoding == lttng_encode_none) | |
1955 | ? "none" | |
1956 | : (container_type->encoding == lttng_encode_UTF8) | |
1957 | ? "UTF8" | |
1958 | : "ASCII", | |
578e68ec GB |
1959 | container_type->base, |
1960 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1961 | container_type->reverse_byte_order ? " byte_order = le;" : "" | |
1962 | #else | |
1963 | container_type->reverse_byte_order ? " byte_order = be;" : "" | |
1964 | #endif | |
1965 | ); | |
141ddf28 MD |
1966 | if (ret) |
1967 | goto end; | |
1968 | /* Dump all entries */ | |
1969 | for (i = 0; i < nr_entries; i++) { | |
1970 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
1971 | int j, len; | |
1972 | ||
1973 | ret = print_tabs(session, nesting + 1); | |
1974 | if (ret) | |
1975 | goto end; | |
1976 | ret = lttng_metadata_printf(session, | |
1977 | "\""); | |
1978 | if (ret) | |
1979 | goto end; | |
1980 | len = strlen(entry->string); | |
1981 | /* Escape the character '"' */ | |
1982 | for (j = 0; j < len; j++) { | |
1983 | char c = entry->string[j]; | |
1984 | ||
1985 | switch (c) { | |
1986 | case '"': | |
1987 | ret = lttng_metadata_printf(session, | |
1988 | "\\\""); | |
1989 | break; | |
1990 | case '\\': | |
1991 | ret = lttng_metadata_printf(session, | |
1992 | "\\\\"); | |
1993 | break; | |
1994 | default: | |
1995 | ret = lttng_metadata_printf(session, | |
1996 | "%c", c); | |
1997 | break; | |
1998 | } | |
1999 | if (ret) | |
2000 | goto end; | |
2001 | } | |
08ad1061 PP |
2002 | ret = lttng_metadata_printf(session, "\""); |
2003 | if (ret) | |
2004 | goto end; | |
2005 | ||
2006 | if (entry->options.is_auto) { | |
2007 | ret = lttng_metadata_printf(session, ",\n"); | |
2008 | if (ret) | |
2009 | goto end; | |
141ddf28 | 2010 | } else { |
7c559490 MD |
2011 | ret = lttng_metadata_printf(session, |
2012 | " = "); | |
2013 | if (ret) | |
2014 | goto end; | |
2015 | if (entry->start.signedness) | |
141ddf28 | 2016 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2017 | "%lld", (long long) entry->start.value); |
2018 | else | |
2019 | ret = lttng_metadata_printf(session, | |
2020 | "%llu", entry->start.value); | |
2021 | if (ret) | |
2022 | goto end; | |
2023 | if (entry->start.signedness == entry->end.signedness && | |
2024 | entry->start.value | |
2025 | == entry->end.value) { | |
141ddf28 | 2026 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2027 | ",\n"); |
2028 | } else { | |
2029 | if (entry->end.signedness) { | |
2030 | ret = lttng_metadata_printf(session, | |
2031 | " ... %lld,\n", | |
2032 | (long long) entry->end.value); | |
2033 | } else { | |
2034 | ret = lttng_metadata_printf(session, | |
2035 | " ... %llu,\n", | |
2036 | entry->end.value); | |
2037 | } | |
141ddf28 | 2038 | } |
7c559490 MD |
2039 | if (ret) |
2040 | goto end; | |
141ddf28 | 2041 | } |
141ddf28 MD |
2042 | } |
2043 | ret = print_tabs(session, nesting); | |
2044 | if (ret) | |
2045 | goto end; | |
2046 | ret = lttng_metadata_printf(session, "} _%s;\n", | |
2047 | field->name); | |
2048 | end: | |
2049 | return ret; | |
2050 | } | |
2051 | ||
d83004aa JD |
2052 | /* |
2053 | * Must be called with sessions_mutex held. | |
2054 | */ | |
c099397a | 2055 | static |
a90917c3 | 2056 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2057 | const struct lttng_event_field *field, |
2058 | size_t nesting) | |
c099397a | 2059 | { |
c099397a | 2060 | int ret = 0; |
c099397a | 2061 | |
8070f5c0 MD |
2062 | switch (field->type.atype) { |
2063 | case atype_integer: | |
f513b2bf MD |
2064 | ret = print_tabs(session, nesting); |
2065 | if (ret) | |
2066 | return ret; | |
8070f5c0 | 2067 | ret = lttng_metadata_printf(session, |
f513b2bf | 2068 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
2069 | field->type.u.basic.integer.size, |
2070 | field->type.u.basic.integer.alignment, | |
2071 | field->type.u.basic.integer.signedness, | |
2072 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
2073 | ? "none" | |
2074 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
2075 | ? "UTF8" | |
2076 | : "ASCII", | |
2077 | field->type.u.basic.integer.base, | |
5214fa50 | 2078 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2079 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 2080 | #else |
8070f5c0 | 2081 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 2082 | #endif |
8070f5c0 MD |
2083 | field->name); |
2084 | break; | |
2085 | case atype_enum: | |
141ddf28 | 2086 | ret = _lttng_enum_statedump(session, field, nesting); |
8070f5c0 MD |
2087 | break; |
2088 | case atype_array: | |
3834b99f | 2089 | case atype_array_bitfield: |
8070f5c0 MD |
2090 | { |
2091 | const struct lttng_basic_type *elem_type; | |
2092 | ||
2093 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 2094 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
2095 | ret = print_tabs(session, nesting); |
2096 | if (ret) | |
2097 | return ret; | |
43803cf2 | 2098 | ret = lttng_metadata_printf(session, |
f513b2bf | 2099 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2100 | field->type.u.array.elem_alignment * CHAR_BIT, |
2101 | field->name); | |
2102 | if (ret) | |
2103 | return ret; | |
2104 | } | |
f513b2bf MD |
2105 | ret = print_tabs(session, nesting); |
2106 | if (ret) | |
2107 | return ret; | |
8070f5c0 | 2108 | ret = lttng_metadata_printf(session, |
f513b2bf | 2109 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
2110 | elem_type->u.basic.integer.size, |
2111 | elem_type->u.basic.integer.alignment, | |
2112 | elem_type->u.basic.integer.signedness, | |
2113 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2114 | ? "none" | |
2115 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
2116 | ? "UTF8" | |
2117 | : "ASCII", | |
2118 | elem_type->u.basic.integer.base, | |
5214fa50 | 2119 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2120 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2121 | #else |
8070f5c0 | 2122 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2123 | #endif |
8070f5c0 MD |
2124 | field->name, field->type.u.array.length); |
2125 | break; | |
2126 | } | |
2127 | case atype_sequence: | |
3834b99f | 2128 | case atype_sequence_bitfield: |
8070f5c0 MD |
2129 | { |
2130 | const struct lttng_basic_type *elem_type; | |
2131 | const struct lttng_basic_type *length_type; | |
2132 | ||
2133 | elem_type = &field->type.u.sequence.elem_type; | |
2134 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
2135 | ret = print_tabs(session, nesting); |
2136 | if (ret) | |
2137 | return ret; | |
8070f5c0 | 2138 | ret = lttng_metadata_printf(session, |
f513b2bf | 2139 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 2140 | length_type->u.basic.integer.size, |
32257272 | 2141 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
2142 | length_type->u.basic.integer.signedness, |
2143 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
2144 | ? "none" | |
0635cdd4 | 2145 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2146 | ? "UTF8" |
0635cdd4 | 2147 | : "ASCII"), |
8070f5c0 | 2148 | length_type->u.basic.integer.base, |
5214fa50 | 2149 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2150 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 2151 | #else |
0635cdd4 | 2152 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 2153 | #endif |
27d2368e MD |
2154 | field->name); |
2155 | if (ret) | |
2156 | return ret; | |
2157 | ||
43803cf2 | 2158 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
2159 | ret = print_tabs(session, nesting); |
2160 | if (ret) | |
2161 | return ret; | |
43803cf2 | 2162 | ret = lttng_metadata_printf(session, |
f513b2bf | 2163 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2164 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
2165 | field->name); | |
2166 | if (ret) | |
2167 | return ret; | |
2168 | } | |
f513b2bf MD |
2169 | ret = print_tabs(session, nesting); |
2170 | if (ret) | |
2171 | return ret; | |
27d2368e | 2172 | ret = lttng_metadata_printf(session, |
f513b2bf | 2173 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 2174 | elem_type->u.basic.integer.size, |
32257272 | 2175 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
2176 | elem_type->u.basic.integer.signedness, |
2177 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2178 | ? "none" | |
0635cdd4 | 2179 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2180 | ? "UTF8" |
0635cdd4 | 2181 | : "ASCII"), |
8070f5c0 | 2182 | elem_type->u.basic.integer.base, |
5214fa50 | 2183 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2184 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2185 | #else |
8070f5c0 | 2186 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2187 | #endif |
8070f5c0 | 2188 | field->name, |
27d2368e | 2189 | field->name); |
8070f5c0 MD |
2190 | break; |
2191 | } | |
c099397a | 2192 | |
8070f5c0 MD |
2193 | case atype_string: |
2194 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2195 | ret = print_tabs(session, nesting); |
2196 | if (ret) | |
2197 | return ret; | |
8070f5c0 | 2198 | ret = lttng_metadata_printf(session, |
f513b2bf | 2199 | "string%s _%s;\n", |
8070f5c0 MD |
2200 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2201 | " { encoding = ASCII; }" : "", | |
2202 | field->name); | |
2203 | break; | |
f513b2bf MD |
2204 | case atype_struct: |
2205 | ret = _lttng_struct_statedump(session, field, nesting); | |
2206 | break; | |
2207 | case atype_array_compound: | |
2208 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2209 | break; | |
2210 | case atype_sequence_compound: | |
2211 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2212 | break; | |
65c85aa6 MD |
2213 | case atype_variant: |
2214 | ret = _lttng_variant_statedump(session, field, nesting); | |
2215 | break; | |
f513b2bf | 2216 | |
8070f5c0 MD |
2217 | default: |
2218 | WARN_ON_ONCE(1); | |
2219 | return -EINVAL; | |
2220 | } | |
2221 | return ret; | |
2222 | } | |
2223 | ||
2224 | static | |
a90917c3 | 2225 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2226 | struct lttng_ctx *ctx) |
2227 | { | |
2228 | int ret = 0; | |
2229 | int i; | |
2230 | ||
2231 | if (!ctx) | |
2232 | return 0; | |
2233 | for (i = 0; i < ctx->nr_fields; i++) { | |
2234 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2235 | ||
f513b2bf | 2236 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2237 | if (ret) |
2238 | return ret; | |
2239 | } | |
2240 | return ret; | |
2241 | } | |
2242 | ||
2243 | static | |
a90917c3 MD |
2244 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2245 | struct lttng_event *event) | |
8070f5c0 MD |
2246 | { |
2247 | const struct lttng_event_desc *desc = event->desc; | |
2248 | int ret = 0; | |
2249 | int i; | |
2250 | ||
2251 | for (i = 0; i < desc->nr_fields; i++) { | |
2252 | const struct lttng_event_field *field = &desc->fields[i]; | |
2253 | ||
f513b2bf | 2254 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2255 | if (ret) |
2256 | return ret; | |
c099397a MD |
2257 | } |
2258 | return ret; | |
2259 | } | |
2260 | ||
d83004aa JD |
2261 | /* |
2262 | * Must be called with sessions_mutex held. | |
2263 | */ | |
c099397a | 2264 | static |
a90917c3 MD |
2265 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2266 | struct lttng_channel *chan, | |
2267 | struct lttng_event *event) | |
c099397a MD |
2268 | { |
2269 | int ret = 0; | |
2270 | ||
a8f2d0c7 | 2271 | if (event->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2272 | return 0; |
d83004aa | 2273 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2274 | return 0; |
2275 | ||
2276 | ret = lttng_metadata_printf(session, | |
2277 | "event {\n" | |
ae734547 | 2278 | " name = \"%s\";\n" |
c099397a | 2279 | " id = %u;\n" |
b9074a1b | 2280 | " stream_id = %u;\n", |
c099397a MD |
2281 | event->desc->name, |
2282 | event->id, | |
2283 | event->chan->id); | |
2284 | if (ret) | |
2285 | goto end; | |
2286 | ||
b9074a1b MD |
2287 | if (event->ctx) { |
2288 | ret = lttng_metadata_printf(session, | |
2289 | " context := struct {\n"); | |
2290 | if (ret) | |
2291 | goto end; | |
2292 | } | |
a90917c3 | 2293 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2294 | if (ret) |
2295 | goto end; | |
b9074a1b MD |
2296 | if (event->ctx) { |
2297 | ret = lttng_metadata_printf(session, | |
2298 | " };\n"); | |
2299 | if (ret) | |
2300 | goto end; | |
2301 | } | |
8070f5c0 MD |
2302 | |
2303 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2304 | " fields := struct {\n" |
2305 | ); | |
2306 | if (ret) | |
2307 | goto end; | |
2308 | ||
a90917c3 | 2309 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2310 | if (ret) |
2311 | goto end; | |
2312 | ||
2313 | /* | |
2314 | * LTTng space reservation can only reserve multiples of the | |
2315 | * byte size. | |
2316 | */ | |
2317 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2318 | " };\n" |
2319 | "};\n\n"); | |
c099397a MD |
2320 | if (ret) |
2321 | goto end; | |
2322 | ||
c099397a MD |
2323 | event->metadata_dumped = 1; |
2324 | end: | |
2325 | return ret; | |
2326 | ||
2327 | } | |
2328 | ||
d83004aa JD |
2329 | /* |
2330 | * Must be called with sessions_mutex held. | |
2331 | */ | |
c099397a | 2332 | static |
a90917c3 MD |
2333 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2334 | struct lttng_channel *chan) | |
c099397a MD |
2335 | { |
2336 | int ret = 0; | |
2337 | ||
a8f2d0c7 | 2338 | if (chan->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2339 | return 0; |
d83004aa JD |
2340 | |
2341 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2342 | return 0; |
2343 | ||
2344 | WARN_ON_ONCE(!chan->header_type); | |
2345 | ret = lttng_metadata_printf(session, | |
2346 | "stream {\n" | |
2347 | " id = %u;\n" | |
9115fbdc | 2348 | " event.header := %s;\n" |
b9074a1b | 2349 | " packet.context := struct packet_context;\n", |
c099397a MD |
2350 | chan->id, |
2351 | chan->header_type == 1 ? "struct event_header_compact" : | |
2352 | "struct event_header_large"); | |
2353 | if (ret) | |
2354 | goto end; | |
2355 | ||
b9074a1b MD |
2356 | if (chan->ctx) { |
2357 | ret = lttng_metadata_printf(session, | |
2358 | " event.context := struct {\n"); | |
2359 | if (ret) | |
2360 | goto end; | |
2361 | } | |
a90917c3 | 2362 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2363 | if (ret) |
2364 | goto end; | |
b9074a1b MD |
2365 | if (chan->ctx) { |
2366 | ret = lttng_metadata_printf(session, | |
2367 | " };\n"); | |
2368 | if (ret) | |
2369 | goto end; | |
2370 | } | |
8070f5c0 MD |
2371 | |
2372 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2373 | "};\n\n"); |
8070f5c0 | 2374 | |
c099397a MD |
2375 | chan->metadata_dumped = 1; |
2376 | end: | |
2377 | return ret; | |
2378 | } | |
2379 | ||
d83004aa JD |
2380 | /* |
2381 | * Must be called with sessions_mutex held. | |
2382 | */ | |
9115fbdc | 2383 | static |
a90917c3 | 2384 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2385 | { |
2386 | return lttng_metadata_printf(session, | |
2387 | "struct packet_context {\n" | |
a3ccff4f MD |
2388 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2389 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2390 | " uint64_t content_size;\n" |
2391 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2392 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2393 | " unsigned long events_discarded;\n" |
9115fbdc | 2394 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2395 | "};\n\n" |
9115fbdc MD |
2396 | ); |
2397 | } | |
2398 | ||
2399 | /* | |
2400 | * Compact header: | |
2401 | * id: range: 0 - 30. | |
2402 | * id 31 is reserved to indicate an extended header. | |
2403 | * | |
2404 | * Large header: | |
2405 | * id: range: 0 - 65534. | |
2406 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2407 | * |
2408 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2409 | */ |
2410 | static | |
a90917c3 | 2411 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2412 | { |
2413 | return lttng_metadata_printf(session, | |
2414 | "struct event_header_compact {\n" | |
2415 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2416 | " variant <id> {\n" | |
2417 | " struct {\n" | |
a3ccff4f | 2418 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2419 | " } compact;\n" |
2420 | " struct {\n" | |
2421 | " uint32_t id;\n" | |
a3ccff4f | 2422 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2423 | " } extended;\n" |
2424 | " } v;\n" | |
2425 | "} align(%u);\n" | |
2426 | "\n" | |
2427 | "struct event_header_large {\n" | |
2428 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2429 | " variant <id> {\n" | |
2430 | " struct {\n" | |
a3ccff4f | 2431 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2432 | " } compact;\n" |
2433 | " struct {\n" | |
2434 | " uint32_t id;\n" | |
a3ccff4f | 2435 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2436 | " } extended;\n" |
2437 | " } v;\n" | |
2438 | "} align(%u);\n\n", | |
a90917c3 MD |
2439 | lttng_alignof(uint32_t) * CHAR_BIT, |
2440 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2441 | ); |
2442 | } | |
2443 | ||
a3ccff4f MD |
2444 | /* |
2445 | * Approximation of NTP time of day to clock monotonic correlation, | |
2446 | * taken at start of trace. | |
2447 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2448 | * in future versions. | |
5283350b MD |
2449 | * This function may return a negative offset. It may happen if the |
2450 | * system sets the REALTIME clock to 0 after boot. | |
a3ccff4f MD |
2451 | */ |
2452 | static | |
8967b2a3 | 2453 | int64_t measure_clock_offset(void) |
a3ccff4f | 2454 | { |
dcb93448 | 2455 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2456 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2457 | int64_t offset; |
a3ccff4f MD |
2458 | struct timespec rts = { 0, 0 }; |
2459 | unsigned long flags; | |
2460 | ||
2461 | /* Disable interrupts to increase correlation precision. */ | |
2462 | local_irq_save(flags); | |
2463 | monotonic[0] = trace_clock_read64(); | |
216b6baa | 2464 | getnstimeofday(&rts); |
a3ccff4f MD |
2465 | monotonic[1] = trace_clock_read64(); |
2466 | local_irq_restore(flags); | |
2467 | ||
dcb93448 | 2468 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2469 | realtime = (uint64_t) rts.tv_sec * tcf; |
2470 | if (tcf == NSEC_PER_SEC) { | |
2471 | realtime += rts.tv_nsec; | |
2472 | } else { | |
2473 | uint64_t n = rts.tv_nsec * tcf; | |
2474 | ||
2475 | do_div(n, NSEC_PER_SEC); | |
2476 | realtime += n; | |
2477 | } | |
dcb93448 | 2478 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2479 | return offset; |
2480 | } | |
2481 | ||
deba832d JR |
2482 | static |
2483 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
2484 | { | |
2485 | int ret; | |
2486 | size_t i; | |
2487 | char cur; | |
2488 | ||
2489 | i = 0; | |
2490 | cur = string[i]; | |
2491 | while (cur != '\0') { | |
2492 | switch (cur) { | |
2493 | case '\n': | |
2494 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
2495 | break; | |
2496 | case '\\': | |
2497 | case '"': | |
2498 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
2499 | if (ret) | |
2500 | goto error; | |
2501 | /* We still print the current char */ | |
2502 | /* Fallthrough */ | |
2503 | default: | |
2504 | ret = lttng_metadata_printf(session, "%c", cur); | |
2505 | break; | |
2506 | } | |
2507 | ||
2508 | if (ret) | |
2509 | goto error; | |
2510 | ||
2511 | cur = string[++i]; | |
2512 | } | |
2513 | error: | |
2514 | return ret; | |
2515 | } | |
2516 | ||
2517 | static | |
a9550ab5 JR |
2518 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
2519 | const char *field_value) | |
deba832d JR |
2520 | { |
2521 | int ret; | |
2522 | ||
a9550ab5 | 2523 | ret = lttng_metadata_printf(session, " %s = \"", field); |
deba832d JR |
2524 | if (ret) |
2525 | goto error; | |
2526 | ||
a9550ab5 | 2527 | ret = print_escaped_ctf_string(session, field_value); |
deba832d JR |
2528 | if (ret) |
2529 | goto error; | |
2530 | ||
2531 | ret = lttng_metadata_printf(session, "\";\n"); | |
2532 | ||
2533 | error: | |
2534 | return ret; | |
2535 | } | |
2536 | ||
c099397a MD |
2537 | /* |
2538 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2539 | * Must be called with sessions_mutex held. |
c099397a MD |
2540 | */ |
2541 | static | |
a90917c3 | 2542 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2543 | { |
30bdb6e4 | 2544 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2545 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2546 | struct lttng_channel *chan; |
2547 | struct lttng_event *event; | |
c099397a MD |
2548 | int ret = 0; |
2549 | ||
a8f2d0c7 | 2550 | if (!READ_ONCE(session->active)) |
c099397a MD |
2551 | return 0; |
2552 | if (session->metadata_dumped) | |
2553 | goto skip_session; | |
c099397a | 2554 | |
d793d5e1 | 2555 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2556 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2557 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2558 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2559 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2560 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2561 | |
2562 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2563 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2564 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2565 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2566 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2567 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2568 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2569 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2570 | "\n" |
2571 | "trace {\n" | |
2572 | " major = %u;\n" | |
2573 | " minor = %u;\n" | |
30bdb6e4 | 2574 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2575 | " byte_order = %s;\n" |
2576 | " packet.header := struct {\n" | |
2577 | " uint32_t magic;\n" | |
1ec3f75a | 2578 | " uint8_t uuid[16];\n" |
d793d5e1 | 2579 | " uint32_t stream_id;\n" |
5594698f | 2580 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2581 | " };\n" |
d793d5e1 | 2582 | "};\n\n", |
a90917c3 MD |
2583 | lttng_alignof(uint8_t) * CHAR_BIT, |
2584 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2585 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2586 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2587 | sizeof(unsigned long) * CHAR_BIT, |
2588 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2589 | CTF_SPEC_MAJOR, |
2590 | CTF_SPEC_MINOR, | |
d793d5e1 | 2591 | uuid_s, |
5214fa50 | 2592 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2593 | "be" |
2594 | #else | |
2595 | "le" | |
2596 | #endif | |
2597 | ); | |
2598 | if (ret) | |
2599 | goto end; | |
2600 | ||
99dc9597 MD |
2601 | ret = lttng_metadata_printf(session, |
2602 | "env {\n" | |
a6058143 | 2603 | " hostname = \"%s\";\n" |
c6c9e10f | 2604 | " domain = \"kernel\";\n" |
99dc9597 | 2605 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2606 | " kernel_release = \"%s\";\n" |
2607 | " kernel_version = \"%s\";\n" | |
2608 | " tracer_name = \"lttng-modules\";\n" | |
2609 | " tracer_major = %d;\n" | |
2610 | " tracer_minor = %d;\n" | |
2611 | " tracer_patchlevel = %d;\n" | |
deba832d | 2612 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 2613 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2614 | utsname()->sysname, |
2615 | utsname()->release, | |
c6c9e10f MD |
2616 | utsname()->version, |
2617 | LTTNG_MODULES_MAJOR_VERSION, | |
2618 | LTTNG_MODULES_MINOR_VERSION, | |
2619 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2620 | ); |
2621 | if (ret) | |
2622 | goto end; | |
2623 | ||
a9550ab5 JR |
2624 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
2625 | if (ret) | |
2626 | goto end; | |
2627 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
2628 | session->creation_time); | |
deba832d JR |
2629 | if (ret) |
2630 | goto end; | |
2631 | ||
2632 | /* Close env */ | |
2633 | ret = lttng_metadata_printf(session, "};\n\n"); | |
2634 | if (ret) | |
2635 | goto end; | |
2636 | ||
a3ccff4f MD |
2637 | ret = lttng_metadata_printf(session, |
2638 | "clock {\n" | |
2754583e MD |
2639 | " name = \"%s\";\n", |
2640 | trace_clock_name() | |
a82c63f1 MD |
2641 | ); |
2642 | if (ret) | |
2643 | goto end; | |
2644 | ||
2645 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2646 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2647 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2648 | clock_uuid_s |
2649 | ); | |
2650 | if (ret) | |
2651 | goto end; | |
2652 | } | |
2653 | ||
2654 | ret = lttng_metadata_printf(session, | |
2754583e | 2655 | " description = \"%s\";\n" |
a3ccff4f MD |
2656 | " freq = %llu; /* Frequency, in Hz */\n" |
2657 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2658 | " offset = %lld;\n" |
a3ccff4f | 2659 | "};\n\n", |
2754583e | 2660 | trace_clock_description(), |
a3ccff4f | 2661 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2662 | (long long) measure_clock_offset() |
a3ccff4f MD |
2663 | ); |
2664 | if (ret) | |
2665 | goto end; | |
2666 | ||
2667 | ret = lttng_metadata_printf(session, | |
2668 | "typealias integer {\n" | |
2669 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2670 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2671 | "} := uint27_clock_monotonic_t;\n" |
2672 | "\n" | |
2673 | "typealias integer {\n" | |
2674 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2675 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2676 | "} := uint32_clock_monotonic_t;\n" |
2677 | "\n" | |
2678 | "typealias integer {\n" | |
2679 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2680 | " map = clock.%s.value;\n" |
a3ccff4f | 2681 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2682 | trace_clock_name(), |
a3ccff4f | 2683 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2684 | trace_clock_name(), |
2685 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2686 | trace_clock_name() | |
a3ccff4f MD |
2687 | ); |
2688 | if (ret) | |
2689 | goto end; | |
2690 | ||
a90917c3 | 2691 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2692 | if (ret) |
2693 | goto end; | |
2694 | ||
a90917c3 | 2695 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2696 | if (ret) |
2697 | goto end; | |
2698 | ||
c099397a MD |
2699 | skip_session: |
2700 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2701 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2702 | if (ret) |
2703 | goto end; | |
2704 | } | |
2705 | ||
2706 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2707 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2708 | if (ret) |
2709 | goto end; | |
2710 | } | |
2711 | session->metadata_dumped = 1; | |
2712 | end: | |
2713 | return ret; | |
2714 | } | |
2715 | ||
c0e31d2e | 2716 | /** |
a90917c3 | 2717 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2718 | * @transport: transport structure |
2719 | * | |
2720 | * Registers a transport which can be used as output to extract the data out of | |
2721 | * LTTng. The module calling this registration function must ensure that no | |
2722 | * trap-inducing code will be executed by the transport functions. E.g. | |
2723 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2724 | * is made visible to the transport function. This registration acts as a | |
2725 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2726 | * after its registration must it synchronize the TLBs. | |
2727 | */ | |
a90917c3 | 2728 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2729 | { |
2730 | /* | |
2731 | * Make sure no page fault can be triggered by the module about to be | |
2732 | * registered. We deal with this here so we don't have to call | |
2733 | * vmalloc_sync_all() in each module's init. | |
2734 | */ | |
6d2a620c | 2735 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2736 | |
2737 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2738 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2739 | mutex_unlock(&sessions_mutex); |
2740 | } | |
a90917c3 | 2741 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2742 | |
2743 | /** | |
a90917c3 | 2744 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2745 | * @transport: transport structure |
2746 | */ | |
a90917c3 | 2747 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2748 | { |
2749 | mutex_lock(&sessions_mutex); | |
2750 | list_del(&transport->node); | |
2751 | mutex_unlock(&sessions_mutex); | |
2752 | } | |
a90917c3 | 2753 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2754 | |
894ce5dc | 2755 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2756 | |
2757 | enum cpuhp_state lttng_hp_prepare; | |
2758 | enum cpuhp_state lttng_hp_online; | |
2759 | ||
2760 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2761 | { | |
2762 | struct lttng_cpuhp_node *lttng_node; | |
2763 | ||
2764 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2765 | switch (lttng_node->component) { | |
2766 | case LTTNG_RING_BUFFER_FRONTEND: | |
2767 | return 0; | |
2768 | case LTTNG_RING_BUFFER_BACKEND: | |
2769 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2770 | case LTTNG_RING_BUFFER_ITER: | |
2771 | return 0; | |
2772 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2773 | return 0; | |
2774 | default: | |
2775 | return -EINVAL; | |
2776 | } | |
2777 | } | |
2778 | ||
2779 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2780 | { | |
2781 | struct lttng_cpuhp_node *lttng_node; | |
2782 | ||
2783 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2784 | switch (lttng_node->component) { | |
2785 | case LTTNG_RING_BUFFER_FRONTEND: | |
2786 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2787 | case LTTNG_RING_BUFFER_BACKEND: | |
2788 | return 0; | |
2789 | case LTTNG_RING_BUFFER_ITER: | |
2790 | return 0; | |
2791 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2792 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2793 | default: | |
2794 | return -EINVAL; | |
2795 | } | |
2796 | } | |
2797 | ||
2798 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2799 | { | |
2800 | struct lttng_cpuhp_node *lttng_node; | |
2801 | ||
2802 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2803 | switch (lttng_node->component) { | |
2804 | case LTTNG_RING_BUFFER_FRONTEND: | |
2805 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2806 | case LTTNG_RING_BUFFER_BACKEND: | |
2807 | return 0; | |
2808 | case LTTNG_RING_BUFFER_ITER: | |
2809 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2810 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2811 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2812 | default: | |
2813 | return -EINVAL; | |
2814 | } | |
2815 | } | |
2816 | ||
2817 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2818 | { | |
2819 | struct lttng_cpuhp_node *lttng_node; | |
2820 | ||
2821 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2822 | switch (lttng_node->component) { | |
2823 | case LTTNG_RING_BUFFER_FRONTEND: | |
2824 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2825 | case LTTNG_RING_BUFFER_BACKEND: | |
2826 | return 0; | |
2827 | case LTTNG_RING_BUFFER_ITER: | |
2828 | return 0; | |
2829 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2830 | return 0; | |
2831 | default: | |
2832 | return -EINVAL; | |
2833 | } | |
2834 | } | |
2835 | ||
2836 | static int __init lttng_init_cpu_hotplug(void) | |
2837 | { | |
2838 | int ret; | |
2839 | ||
2840 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2841 | lttng_hotplug_prepare, | |
2842 | lttng_hotplug_dead); | |
2843 | if (ret < 0) { | |
2844 | return ret; | |
2845 | } | |
2846 | lttng_hp_prepare = ret; | |
2847 | lttng_rb_set_hp_prepare(ret); | |
2848 | ||
2849 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2850 | lttng_hotplug_online, | |
2851 | lttng_hotplug_offline); | |
2852 | if (ret < 0) { | |
2853 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2854 | lttng_hp_prepare = 0; | |
2855 | return ret; | |
2856 | } | |
2857 | lttng_hp_online = ret; | |
2858 | lttng_rb_set_hp_online(ret); | |
2859 | ||
2860 | return 0; | |
2861 | } | |
2862 | ||
2863 | static void __exit lttng_exit_cpu_hotplug(void) | |
2864 | { | |
2865 | lttng_rb_set_hp_online(0); | |
2866 | cpuhp_remove_multi_state(lttng_hp_online); | |
2867 | lttng_rb_set_hp_prepare(0); | |
2868 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2869 | } | |
2870 | ||
1ee63d8d | 2871 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2872 | static int lttng_init_cpu_hotplug(void) |
2873 | { | |
2874 | return 0; | |
2875 | } | |
2876 | static void lttng_exit_cpu_hotplug(void) | |
2877 | { | |
2878 | } | |
1ee63d8d | 2879 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2880 | |
2881 | ||
a90917c3 | 2882 | static int __init lttng_events_init(void) |
4e3c1b9b | 2883 | { |
1c25284c MD |
2884 | int ret; |
2885 | ||
453b2495 JD |
2886 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2887 | if (ret) | |
2888 | return ret; | |
389d7070 | 2889 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2890 | if (ret) |
2891 | return ret; | |
2892 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
2893 | if (ret) |
2894 | return ret; | |
2895 | ret = lttng_probes_init(); | |
389d7070 MD |
2896 | if (ret) |
2897 | return ret; | |
07dfc1d0 | 2898 | ret = lttng_context_init(); |
20591cf7 MD |
2899 | if (ret) |
2900 | return ret; | |
07dfc1d0 MD |
2901 | ret = lttng_tracepoint_init(); |
2902 | if (ret) | |
2903 | goto error_tp; | |
a90917c3 | 2904 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2905 | if (!event_cache) { |
2906 | ret = -ENOMEM; | |
2907 | goto error_kmem; | |
2908 | } | |
80996790 | 2909 | ret = lttng_abi_init(); |
02119ee5 MD |
2910 | if (ret) |
2911 | goto error_abi; | |
0c956676 MD |
2912 | ret = lttng_logger_init(); |
2913 | if (ret) | |
2914 | goto error_logger; | |
1e367326 MD |
2915 | ret = lttng_init_cpu_hotplug(); |
2916 | if (ret) | |
2917 | goto error_hotplug; | |
101215b7 | 2918 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2919 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2920 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2921 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2922 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2923 | LTTNG_VERSION_NAME, |
2924 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2925 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2926 | #else | |
2927 | "", | |
2928 | #endif | |
2929 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2930 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2931 | #else | |
2932 | ""); | |
2933 | #endif | |
4e3c1b9b | 2934 | return 0; |
0c956676 | 2935 | |
1e367326 MD |
2936 | error_hotplug: |
2937 | lttng_logger_exit(); | |
0c956676 MD |
2938 | error_logger: |
2939 | lttng_abi_exit(); | |
02119ee5 | 2940 | error_abi: |
1c25284c | 2941 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2942 | error_kmem: |
2943 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2944 | error_tp: |
2945 | lttng_context_exit(); | |
101215b7 | 2946 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2947 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2948 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2949 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2950 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2951 | LTTNG_VERSION_NAME, |
2952 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2953 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2954 | #else | |
2955 | "", | |
2956 | #endif | |
2957 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2958 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2959 | #else | |
2960 | ""); | |
2961 | #endif | |
1c25284c | 2962 | return ret; |
4e3c1b9b MD |
2963 | } |
2964 | ||
a90917c3 | 2965 | module_init(lttng_events_init); |
11b5a3c2 | 2966 | |
a90917c3 | 2967 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2968 | { |
a90917c3 | 2969 | struct lttng_session *session, *tmpsession; |
92e94819 | 2970 | |
1e367326 | 2971 | lttng_exit_cpu_hotplug(); |
0c956676 | 2972 | lttng_logger_exit(); |
80996790 | 2973 | lttng_abi_exit(); |
92e94819 | 2974 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2975 | lttng_session_destroy(session); |
11b5a3c2 | 2976 | kmem_cache_destroy(event_cache); |
20591cf7 | 2977 | lttng_tracepoint_exit(); |
07dfc1d0 | 2978 | lttng_context_exit(); |
101215b7 | 2979 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2980 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2981 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2982 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2983 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2984 | LTTNG_VERSION_NAME, |
2985 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2986 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2987 | #else | |
2988 | "", | |
2989 | #endif | |
2990 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2991 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2992 | #else | |
2993 | ""); | |
2994 | #endif | |
4e3c1b9b | 2995 | } |
92e94819 | 2996 | |
a90917c3 | 2997 | module_exit(lttng_events_exit); |
11b5a3c2 | 2998 | |
101215b7 MJ |
2999 | #include "extra_version/patches.i" |
3000 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3001 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3002 | #endif | |
3003 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3004 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3005 | #endif | |
92e94819 MD |
3006 | MODULE_LICENSE("GPL and additional rights"); |
3007 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3008 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3009 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3010 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3011 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3012 | LTTNG_MODULES_EXTRAVERSION); |