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