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