Commit | Line | Data |
---|---|---|
9f36eaed MJ |
1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
2 | * | |
a90917c3 | 3 | * lttng-events.c |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
389d7070 MD |
10 | /* |
11 | * This page_alloc.h wrapper needs to be included before gfpflags.h because it | |
12 | * overrides a function with a define. | |
13 | */ | |
14 | #include "wrapper/page_alloc.h" | |
15 | ||
4e3c1b9b | 16 | #include <linux/module.h> |
c0e31d2e MD |
17 | #include <linux/mutex.h> |
18 | #include <linux/sched.h> | |
11b5a3c2 | 19 | #include <linux/slab.h> |
c099397a | 20 | #include <linux/jiffies.h> |
99dc9597 | 21 | #include <linux/utsname.h> |
abc0446a | 22 | #include <linux/err.h> |
7e6f9ef6 MD |
23 | #include <linux/seq_file.h> |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
241ae9a8 | 26 | #include <wrapper/file.h> |
3c997079 | 27 | #include <linux/jhash.h> |
8c6e7f13 | 28 | #include <linux/uaccess.h> |
a606b6e8 | 29 | #include <linux/vmalloc.h> |
41f229dc | 30 | #include <linux/uuid.h> |
3c997079 | 31 | |
241ae9a8 MD |
32 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */ |
33 | #include <wrapper/random.h> | |
34 | #include <wrapper/tracepoint.h> | |
35 | #include <wrapper/list.h> | |
cbc19040 | 36 | #include <wrapper/types.h> |
241ae9a8 MD |
37 | #include <lttng-kernel-version.h> |
38 | #include <lttng-events.h> | |
39 | #include <lttng-tracer.h> | |
40 | #include <lttng-abi-old.h> | |
5214fa50 | 41 | #include <lttng-endian.h> |
4993071a | 42 | #include <lttng-string-utils.h> |
64af2437 MD |
43 | #include <wrapper/ringbuffer/backend.h> |
44 | #include <wrapper/ringbuffer/frontend.h> | |
4e3c1b9b | 45 | |
d83004aa JD |
46 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
47 | ||
4e3c1b9b | 48 | static LIST_HEAD(sessions); |
a90917c3 | 49 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
50 | /* |
51 | * Protect the sessions and metadata caches. | |
52 | */ | |
4e3c1b9b MD |
53 | static DEFINE_MUTEX(sessions_mutex); |
54 | static struct kmem_cache *event_cache; | |
55 | ||
3c997079 MD |
56 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
57 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
58 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
59 | ||
a90917c3 MD |
60 | static void _lttng_event_destroy(struct lttng_event *event); |
61 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
62 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 63 | static |
a90917c3 MD |
64 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
65 | struct lttng_channel *chan, | |
66 | struct lttng_event *event); | |
c099397a | 67 | static |
a90917c3 | 68 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
69 | static |
70 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf MD |
71 | static |
72 | int _lttng_field_statedump(struct lttng_session *session, | |
73 | const struct lttng_event_field *field, | |
74 | size_t nesting); | |
c099397a | 75 | |
c099397a | 76 | void synchronize_trace(void) |
abcca994 MD |
77 | { |
78 | synchronize_sched(); | |
b8590f40 MD |
79 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
80 | #ifdef CONFIG_PREEMPT_RT_FULL | |
81 | synchronize_rcu(); | |
82 | #endif | |
83 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
84 | #ifdef CONFIG_PREEMPT_RT |
85 | synchronize_rcu(); | |
86 | #endif | |
b8590f40 | 87 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
88 | } |
89 | ||
3c997079 MD |
90 | void lttng_lock_sessions(void) |
91 | { | |
92 | mutex_lock(&sessions_mutex); | |
93 | } | |
94 | ||
95 | void lttng_unlock_sessions(void) | |
96 | { | |
97 | mutex_unlock(&sessions_mutex); | |
98 | } | |
99 | ||
100 | /* | |
101 | * Called with sessions lock held. | |
102 | */ | |
103 | int lttng_session_active(void) | |
104 | { | |
105 | struct lttng_session *iter; | |
106 | ||
107 | list_for_each_entry(iter, &sessions, list) { | |
108 | if (iter->active) | |
109 | return 1; | |
110 | } | |
111 | return 0; | |
112 | } | |
113 | ||
a90917c3 | 114 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 115 | { |
a90917c3 | 116 | struct lttng_session *session; |
d83004aa | 117 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 118 | int i; |
4e3c1b9b MD |
119 | |
120 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 121 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 122 | if (!session) |
d83004aa | 123 | goto err; |
4e3c1b9b | 124 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 125 | INIT_LIST_HEAD(&session->events); |
d793d5e1 | 126 | uuid_le_gen(&session->uuid); |
d83004aa JD |
127 | |
128 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
129 | GFP_KERNEL); | |
130 | if (!metadata_cache) | |
131 | goto err_free_session; | |
0ca42eb7 | 132 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
133 | if (!metadata_cache->data) |
134 | goto err_free_cache; | |
135 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
136 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 137 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
138 | session->metadata_cache = metadata_cache; |
139 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
140 | memcpy(&metadata_cache->uuid, &session->uuid, |
141 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
142 | INIT_LIST_HEAD(&session->enablers_head); |
143 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
144 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b MD |
145 | list_add(&session->list, &sessions); |
146 | mutex_unlock(&sessions_mutex); | |
147 | return session; | |
d83004aa JD |
148 | |
149 | err_free_cache: | |
150 | kfree(metadata_cache); | |
151 | err_free_session: | |
48f5e0b5 | 152 | lttng_kvfree(session); |
d83004aa JD |
153 | err: |
154 | mutex_unlock(&sessions_mutex); | |
155 | return NULL; | |
156 | } | |
157 | ||
158 | void metadata_cache_destroy(struct kref *kref) | |
159 | { | |
160 | struct lttng_metadata_cache *cache = | |
161 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 162 | vfree(cache->data); |
d83004aa | 163 | kfree(cache); |
4e3c1b9b MD |
164 | } |
165 | ||
a90917c3 | 166 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 167 | { |
a90917c3 MD |
168 | struct lttng_channel *chan, *tmpchan; |
169 | struct lttng_event *event, *tmpevent; | |
d83004aa | 170 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 171 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 172 | int ret; |
4e3c1b9b MD |
173 | |
174 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 175 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
176 | list_for_each_entry(chan, &session->chan, list) { |
177 | ret = lttng_syscalls_unregister(chan); | |
178 | WARN_ON(ret); | |
179 | } | |
dda6a249 | 180 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 181 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
182 | WARN_ON(ret); |
183 | } | |
abcca994 | 184 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
185 | list_for_each_entry_safe(enabler, tmpenabler, |
186 | &session->enablers_head, node) | |
187 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 188 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 189 | _lttng_event_destroy(event); |
d83004aa JD |
190 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
191 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 192 | _lttng_channel_destroy(chan); |
d83004aa JD |
193 | } |
194 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
195 | _lttng_metadata_channel_hangup(metadata_stream); | |
e0130fab MD |
196 | if (session->pid_tracker) |
197 | lttng_pid_tracker_destroy(session->pid_tracker); | |
d83004aa | 198 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
199 | list_del(&session->list); |
200 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 201 | lttng_kvfree(session); |
4e3c1b9b MD |
202 | } |
203 | ||
601252cf MD |
204 | int lttng_session_statedump(struct lttng_session *session) |
205 | { | |
206 | int ret; | |
207 | ||
208 | mutex_lock(&sessions_mutex); | |
209 | ret = lttng_statedump_start(session); | |
210 | mutex_unlock(&sessions_mutex); | |
211 | return ret; | |
212 | } | |
213 | ||
a90917c3 | 214 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
215 | { |
216 | int ret = 0; | |
a90917c3 | 217 | struct lttng_channel *chan; |
c0e31d2e MD |
218 | |
219 | mutex_lock(&sessions_mutex); | |
220 | if (session->active) { | |
221 | ret = -EBUSY; | |
222 | goto end; | |
223 | } | |
c099397a | 224 | |
3c997079 MD |
225 | /* Set transient enabler state to "enabled" */ |
226 | session->tstate = 1; | |
227 | ||
4ef81e4a MD |
228 | /* We need to sync enablers with session before activation. */ |
229 | lttng_session_sync_enablers(session); | |
230 | ||
c099397a MD |
231 | /* |
232 | * Snapshot the number of events per channel to know the type of header | |
233 | * we need to use. | |
234 | */ | |
235 | list_for_each_entry(chan, &session->chan, list) { | |
236 | if (chan->header_type) | |
237 | continue; /* don't change it if session stop/restart */ | |
238 | if (chan->free_event_id < 31) | |
239 | chan->header_type = 1; /* compact */ | |
240 | else | |
241 | chan->header_type = 2; /* large */ | |
242 | } | |
243 | ||
64af2437 | 244 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
245 | list_for_each_entry(chan, &session->chan, list) { |
246 | if (chan->channel_type != METADATA_CHANNEL) | |
247 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
248 | } | |
64af2437 | 249 | |
a8f2d0c7 MJ |
250 | WRITE_ONCE(session->active, 1); |
251 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 252 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 253 | if (ret) { |
a8f2d0c7 | 254 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
255 | goto end; |
256 | } | |
257 | ret = lttng_statedump_start(session); | |
360f38ea | 258 | if (ret) |
a8f2d0c7 | 259 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
260 | end: |
261 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 262 | return ret; |
c0e31d2e MD |
263 | } |
264 | ||
a90917c3 | 265 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
266 | { |
267 | int ret = 0; | |
64af2437 | 268 | struct lttng_channel *chan; |
c0e31d2e MD |
269 | |
270 | mutex_lock(&sessions_mutex); | |
271 | if (!session->active) { | |
272 | ret = -EBUSY; | |
273 | goto end; | |
274 | } | |
a8f2d0c7 | 275 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
276 | |
277 | /* Set transient enabler state to "disabled" */ | |
278 | session->tstate = 0; | |
279 | lttng_session_sync_enablers(session); | |
64af2437 MD |
280 | |
281 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
282 | list_for_each_entry(chan, &session->chan, list) { |
283 | if (chan->channel_type != METADATA_CHANNEL) | |
284 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
285 | } | |
c0e31d2e MD |
286 | end: |
287 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 288 | return ret; |
c0e31d2e MD |
289 | } |
290 | ||
9616f0bf JD |
291 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
292 | { | |
293 | int ret = 0; | |
294 | struct lttng_channel *chan; | |
295 | struct lttng_event *event; | |
296 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
297 | struct lttng_metadata_stream *stream; | |
298 | ||
299 | mutex_lock(&sessions_mutex); | |
300 | if (!session->active) { | |
301 | ret = -EBUSY; | |
302 | goto end; | |
303 | } | |
304 | ||
305 | mutex_lock(&cache->lock); | |
306 | memset(cache->data, 0, cache->cache_alloc); | |
307 | cache->metadata_written = 0; | |
308 | cache->version++; | |
309 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
310 | stream->metadata_out = 0; | |
311 | stream->metadata_in = 0; | |
312 | } | |
313 | mutex_unlock(&cache->lock); | |
314 | ||
315 | session->metadata_dumped = 0; | |
316 | list_for_each_entry(chan, &session->chan, list) { | |
317 | chan->metadata_dumped = 0; | |
318 | } | |
319 | ||
320 | list_for_each_entry(event, &session->events, list) { | |
321 | event->metadata_dumped = 0; | |
322 | } | |
323 | ||
324 | ret = _lttng_session_metadata_statedump(session); | |
325 | ||
326 | end: | |
327 | mutex_unlock(&sessions_mutex); | |
328 | return ret; | |
329 | } | |
330 | ||
a90917c3 | 331 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 332 | { |
3c997079 | 333 | int ret = 0; |
e64957da | 334 | |
3c997079 MD |
335 | mutex_lock(&sessions_mutex); |
336 | if (channel->channel_type == METADATA_CHANNEL) { | |
337 | ret = -EPERM; | |
338 | goto end; | |
339 | } | |
340 | if (channel->enabled) { | |
341 | ret = -EEXIST; | |
342 | goto end; | |
343 | } | |
344 | /* Set transient enabler state to "enabled" */ | |
345 | channel->tstate = 1; | |
346 | lttng_session_sync_enablers(channel->session); | |
347 | /* Set atomically the state to "enabled" */ | |
a8f2d0c7 | 348 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
349 | end: |
350 | mutex_unlock(&sessions_mutex); | |
351 | return ret; | |
e64957da MD |
352 | } |
353 | ||
a90917c3 | 354 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 355 | { |
3c997079 | 356 | int ret = 0; |
e64957da | 357 | |
3c997079 MD |
358 | mutex_lock(&sessions_mutex); |
359 | if (channel->channel_type == METADATA_CHANNEL) { | |
360 | ret = -EPERM; | |
361 | goto end; | |
362 | } | |
363 | if (!channel->enabled) { | |
364 | ret = -EEXIST; | |
365 | goto end; | |
366 | } | |
367 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 368 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
369 | /* Set transient enabler state to "enabled" */ |
370 | channel->tstate = 0; | |
371 | lttng_session_sync_enablers(channel->session); | |
372 | end: | |
373 | mutex_unlock(&sessions_mutex); | |
374 | return ret; | |
e64957da MD |
375 | } |
376 | ||
a90917c3 | 377 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 378 | { |
3c997079 | 379 | int ret = 0; |
e64957da | 380 | |
3c997079 MD |
381 | mutex_lock(&sessions_mutex); |
382 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
383 | ret = -EPERM; | |
384 | goto end; | |
385 | } | |
386 | if (event->enabled) { | |
387 | ret = -EEXIST; | |
388 | goto end; | |
389 | } | |
a0493bef MD |
390 | switch (event->instrumentation) { |
391 | case LTTNG_KERNEL_TRACEPOINT: | |
392 | case LTTNG_KERNEL_SYSCALL: | |
393 | ret = -EINVAL; | |
394 | break; | |
395 | case LTTNG_KERNEL_KPROBE: | |
396 | case LTTNG_KERNEL_FUNCTION: | |
149b9a9d | 397 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 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: | |
149b9a9d | 433 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 434 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 435 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
436 | break; |
437 | case LTTNG_KERNEL_KRETPROBE: | |
438 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
439 | break; | |
440 | default: | |
441 | WARN_ON_ONCE(1); | |
442 | ret = -EINVAL; | |
443 | } | |
3c997079 MD |
444 | end: |
445 | mutex_unlock(&sessions_mutex); | |
446 | return ret; | |
e64957da MD |
447 | } |
448 | ||
a90917c3 | 449 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 450 | { |
a90917c3 | 451 | struct lttng_transport *transport; |
f3d01b96 | 452 | |
a90917c3 | 453 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
454 | if (!strcmp(transport->name, name)) |
455 | return transport; | |
456 | } | |
457 | return NULL; | |
458 | } | |
459 | ||
a90917c3 | 460 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
461 | const char *transport_name, |
462 | void *buf_addr, | |
4e3c1b9b MD |
463 | size_t subbuf_size, size_t num_subbuf, |
464 | unsigned int switch_timer_interval, | |
d83004aa JD |
465 | unsigned int read_timer_interval, |
466 | enum channel_type channel_type) | |
4e3c1b9b | 467 | { |
a90917c3 MD |
468 | struct lttng_channel *chan; |
469 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
470 | |
471 | mutex_lock(&sessions_mutex); | |
d83004aa | 472 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 473 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 474 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
475 | if (!transport) { |
476 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
477 | transport_name); | |
c0e31d2e | 478 | goto notransport; |
f3d01b96 | 479 | } |
a33c9927 MD |
480 | if (!try_module_get(transport->owner)) { |
481 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
482 | goto notransport; | |
483 | } | |
a90917c3 | 484 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 485 | if (!chan) |
c0e31d2e | 486 | goto nomem; |
4e3c1b9b | 487 | chan->session = session; |
05d32c64 | 488 | chan->id = session->free_chan_id++; |
3b731ab1 | 489 | chan->ops = &transport->ops; |
125b4df4 MD |
490 | /* |
491 | * Note: the channel creation op already writes into the packet | |
492 | * headers. Therefore the "chan" information used as input | |
493 | * should be already accessible. | |
494 | */ | |
5f5ddf01 MD |
495 | chan->chan = transport->ops.channel_create(transport_name, |
496 | chan, buf_addr, subbuf_size, num_subbuf, | |
497 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
498 | if (!chan->chan) |
499 | goto create_error; | |
3c997079 | 500 | chan->tstate = 1; |
e64957da | 501 | chan->enabled = 1; |
a33c9927 | 502 | chan->transport = transport; |
d83004aa | 503 | chan->channel_type = channel_type; |
4e3c1b9b MD |
504 | list_add(&chan->list, &session->chan); |
505 | mutex_unlock(&sessions_mutex); | |
506 | return chan; | |
507 | ||
f3d01b96 MD |
508 | create_error: |
509 | kfree(chan); | |
c0e31d2e | 510 | nomem: |
a33c9927 MD |
511 | if (transport) |
512 | module_put(transport->owner); | |
c0e31d2e | 513 | notransport: |
e5382b6d | 514 | active: |
4e3c1b9b MD |
515 | mutex_unlock(&sessions_mutex); |
516 | return NULL; | |
517 | } | |
518 | ||
519 | /* | |
d83004aa JD |
520 | * Only used internally at session destruction for per-cpu channels, and |
521 | * when metadata channel is released. | |
522 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 523 | */ |
aa7c23a9 | 524 | static |
a90917c3 | 525 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 526 | { |
11b5a3c2 | 527 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 528 | module_put(chan->transport->owner); |
4e3c1b9b | 529 | list_del(&chan->list); |
8070f5c0 | 530 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
531 | kfree(chan); |
532 | } | |
533 | ||
d83004aa JD |
534 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
535 | { | |
536 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
537 | ||
538 | /* Protect the metadata cache with the sessions_mutex. */ | |
539 | mutex_lock(&sessions_mutex); | |
540 | _lttng_channel_destroy(chan); | |
541 | mutex_unlock(&sessions_mutex); | |
542 | } | |
543 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
544 | ||
545 | static | |
546 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
547 | { | |
548 | stream->finalized = 1; | |
549 | wake_up_interruptible(&stream->read_wait); | |
550 | } | |
551 | ||
e5382b6d MD |
552 | /* |
553 | * Supports event creation while tracing session is active. | |
3c997079 | 554 | * Needs to be called with sessions mutex held. |
e5382b6d | 555 | */ |
3c997079 MD |
556 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
557 | struct lttng_kernel_event *event_param, | |
558 | void *filter, | |
559 | const struct lttng_event_desc *event_desc, | |
560 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 561 | { |
3c997079 | 562 | struct lttng_session *session = chan->session; |
a90917c3 | 563 | struct lttng_event *event; |
3c997079 MD |
564 | const char *event_name; |
565 | struct hlist_head *head; | |
566 | size_t name_len; | |
567 | uint32_t hash; | |
3d084699 | 568 | int ret; |
4e3c1b9b | 569 | |
abc0446a | 570 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 571 | ret = -EMFILE; |
e5382b6d | 572 | goto full; |
abc0446a | 573 | } |
3c997079 MD |
574 | |
575 | switch (itype) { | |
576 | case LTTNG_KERNEL_TRACEPOINT: | |
577 | event_name = event_desc->name; | |
578 | break; | |
579 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 580 | case LTTNG_KERNEL_UPROBE: |
3c997079 MD |
581 | case LTTNG_KERNEL_KRETPROBE: |
582 | case LTTNG_KERNEL_FUNCTION: | |
583 | case LTTNG_KERNEL_NOOP: | |
33a39a3c | 584 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
585 | event_name = event_param->name; |
586 | break; | |
587 | default: | |
588 | WARN_ON_ONCE(1); | |
589 | ret = -EINVAL; | |
590 | goto type_error; | |
591 | } | |
592 | name_len = strlen(event_name); | |
593 | hash = jhash(event_name, name_len, 0); | |
594 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 595 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
596 | WARN_ON_ONCE(!event->desc); |
597 | if (!strncmp(event->desc->name, event_name, | |
598 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
599 | && chan == event->chan) { | |
600 | ret = -EEXIST; | |
601 | goto exist; | |
abc0446a MD |
602 | } |
603 | } | |
3c997079 | 604 | |
11b5a3c2 | 605 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 606 | if (!event) { |
4cf0bf51 | 607 | ret = -ENOMEM; |
4e3c1b9b | 608 | goto cache_error; |
abc0446a | 609 | } |
4e3c1b9b MD |
610 | event->chan = chan; |
611 | event->filter = filter; | |
e5382b6d | 612 | event->id = chan->free_event_id++; |
3c997079 MD |
613 | event->instrumentation = itype; |
614 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 615 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
616 | INIT_LIST_HEAD(&event->enablers_ref_head); |
617 | ||
618 | switch (itype) { | |
ab2277d6 | 619 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
620 | /* Event will be enabled by enabler sync. */ |
621 | event->enabled = 0; | |
622 | event->registered = 0; | |
623 | event->desc = lttng_event_get(event_name); | |
abc0446a | 624 | if (!event->desc) { |
4cf0bf51 | 625 | ret = -ENOENT; |
d3dbe23c | 626 | goto register_error; |
abc0446a | 627 | } |
3c997079 MD |
628 | /* Populate lttng_event structure before event registration. */ |
629 | smp_wmb(); | |
baf20995 | 630 | break; |
ab2277d6 | 631 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
632 | /* |
633 | * Needs to be explicitly enabled after creation, since | |
634 | * we may want to apply filters. | |
635 | */ | |
636 | event->enabled = 0; | |
3c997079 MD |
637 | event->registered = 1; |
638 | /* | |
639 | * Populate lttng_event structure before event | |
640 | * registration. | |
641 | */ | |
642 | smp_wmb(); | |
643 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
644 | event_param->u.kprobe.symbol_name, |
645 | event_param->u.kprobe.offset, | |
646 | event_param->u.kprobe.addr, | |
647 | event); | |
abc0446a | 648 | if (ret) { |
4cf0bf51 | 649 | ret = -EINVAL; |
d6d808f3 | 650 | goto register_error; |
abc0446a | 651 | } |
edeb3137 MD |
652 | ret = try_module_get(event->desc->owner); |
653 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 654 | break; |
7371f44c MD |
655 | case LTTNG_KERNEL_KRETPROBE: |
656 | { | |
a90917c3 | 657 | struct lttng_event *event_return; |
7371f44c MD |
658 | |
659 | /* kretprobe defines 2 events */ | |
a0493bef MD |
660 | /* |
661 | * Needs to be explicitly enabled after creation, since | |
662 | * we may want to apply filters. | |
663 | */ | |
664 | event->enabled = 0; | |
3c997079 | 665 | event->registered = 1; |
7371f44c MD |
666 | event_return = |
667 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 668 | if (!event_return) { |
4cf0bf51 | 669 | ret = -ENOMEM; |
7371f44c | 670 | goto register_error; |
abc0446a | 671 | } |
7371f44c MD |
672 | event_return->chan = chan; |
673 | event_return->filter = filter; | |
674 | event_return->id = chan->free_event_id++; | |
a0493bef | 675 | event_return->enabled = 0; |
3c997079 MD |
676 | event_return->registered = 1; |
677 | event_return->instrumentation = itype; | |
7371f44c | 678 | /* |
a90917c3 | 679 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
680 | */ |
681 | smp_wmb(); | |
3c997079 | 682 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
683 | event_param->u.kretprobe.symbol_name, |
684 | event_param->u.kretprobe.offset, | |
685 | event_param->u.kretprobe.addr, | |
686 | event, event_return); | |
687 | if (ret) { | |
688 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 689 | ret = -EINVAL; |
7371f44c MD |
690 | goto register_error; |
691 | } | |
692 | /* Take 2 refs on the module: one per event. */ | |
693 | ret = try_module_get(event->desc->owner); | |
694 | WARN_ON_ONCE(!ret); | |
695 | ret = try_module_get(event->desc->owner); | |
696 | WARN_ON_ONCE(!ret); | |
a90917c3 | 697 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 698 | event_return); |
abc0446a | 699 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
700 | if (ret) { |
701 | kmem_cache_free(event_cache, event_return); | |
702 | module_put(event->desc->owner); | |
703 | module_put(event->desc->owner); | |
704 | goto statedump_error; | |
705 | } | |
706 | list_add(&event_return->list, &chan->session->events); | |
707 | break; | |
708 | } | |
ab2277d6 | 709 | case LTTNG_KERNEL_FUNCTION: |
a0493bef MD |
710 | /* |
711 | * Needs to be explicitly enabled after creation, since | |
712 | * we may want to apply filters. | |
713 | */ | |
714 | event->enabled = 0; | |
3c997079 MD |
715 | event->registered = 1; |
716 | /* | |
717 | * Populate lttng_event structure before event | |
718 | * registration. | |
719 | */ | |
720 | smp_wmb(); | |
721 | ret = lttng_ftrace_register(event_name, | |
e0a7a7c4 MD |
722 | event_param->u.ftrace.symbol_name, |
723 | event); | |
abc0446a | 724 | if (ret) { |
e0a7a7c4 | 725 | goto register_error; |
abc0446a | 726 | } |
edeb3137 MD |
727 | ret = try_module_get(event->desc->owner); |
728 | WARN_ON_ONCE(!ret); | |
e0a7a7c4 | 729 | break; |
1ec65de1 | 730 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 731 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
732 | /* |
733 | * Needs to be explicitly enabled after creation, since | |
734 | * we may want to apply filters. | |
735 | */ | |
736 | event->enabled = 0; | |
3c997079 MD |
737 | event->registered = 0; |
738 | event->desc = event_desc; | |
abc0446a | 739 | if (!event->desc) { |
4cf0bf51 | 740 | ret = -EINVAL; |
259b6cb3 | 741 | goto register_error; |
abc0446a | 742 | } |
1ec65de1 | 743 | break; |
149b9a9d | 744 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
745 | /* |
746 | * Needs to be explicitly enabled after creation, since | |
747 | * we may want to apply filters. | |
748 | */ | |
749 | event->enabled = 0; | |
750 | event->registered = 1; | |
3aed4dca | 751 | |
a344f64b FD |
752 | /* |
753 | * Populate lttng_event structure before event | |
754 | * registration. | |
755 | */ | |
756 | smp_wmb(); | |
149b9a9d YB |
757 | |
758 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 759 | event_param->u.uprobe.fd, |
149b9a9d YB |
760 | event); |
761 | if (ret) | |
762 | goto register_error; | |
763 | ret = try_module_get(event->desc->owner); | |
764 | WARN_ON_ONCE(!ret); | |
765 | break; | |
baf20995 MD |
766 | default: |
767 | WARN_ON_ONCE(1); | |
4cf0bf51 | 768 | ret = -EINVAL; |
df07930b | 769 | goto register_error; |
baf20995 | 770 | } |
a90917c3 | 771 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
772 | WARN_ON_ONCE(ret > 0); |
773 | if (ret) { | |
c099397a | 774 | goto statedump_error; |
abc0446a | 775 | } |
3c997079 | 776 | hlist_add_head(&event->hlist, head); |
dda6a249 | 777 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
778 | return event; |
779 | ||
c099397a | 780 | statedump_error: |
259b6cb3 | 781 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 782 | register_error: |
11b5a3c2 | 783 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
784 | cache_error: |
785 | exist: | |
3c997079 | 786 | type_error: |
e5382b6d | 787 | full: |
4cf0bf51 | 788 | return ERR_PTR(ret); |
4e3c1b9b MD |
789 | } |
790 | ||
3c997079 MD |
791 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
792 | struct lttng_kernel_event *event_param, | |
793 | void *filter, | |
794 | const struct lttng_event_desc *event_desc, | |
795 | enum lttng_kernel_instrumentation itype) | |
796 | { | |
797 | struct lttng_event *event; | |
798 | ||
799 | mutex_lock(&sessions_mutex); | |
800 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
801 | itype); | |
802 | mutex_unlock(&sessions_mutex); | |
803 | return event; | |
804 | } | |
805 | ||
806 | /* Only used for tracepoints for now. */ | |
807 | static | |
808 | void register_event(struct lttng_event *event) | |
809 | { | |
810 | const struct lttng_event_desc *desc; | |
f127e61e | 811 | int ret = -EINVAL; |
3c997079 | 812 | |
3c997079 MD |
813 | if (event->registered) |
814 | return; | |
4ecb5ad5 | 815 | |
3c997079 | 816 | desc = event->desc; |
4ecb5ad5 MD |
817 | switch (event->instrumentation) { |
818 | case LTTNG_KERNEL_TRACEPOINT: | |
819 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
820 | desc->probe_callback, | |
821 | event); | |
822 | break; | |
823 | case LTTNG_KERNEL_SYSCALL: | |
824 | ret = lttng_syscall_filter_enable(event->chan, | |
825 | desc->name); | |
826 | break; | |
827 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 828 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 MD |
829 | case LTTNG_KERNEL_KRETPROBE: |
830 | case LTTNG_KERNEL_FUNCTION: | |
831 | case LTTNG_KERNEL_NOOP: | |
832 | ret = 0; | |
833 | break; | |
834 | default: | |
835 | WARN_ON_ONCE(1); | |
836 | } | |
3c997079 MD |
837 | if (!ret) |
838 | event->registered = 1; | |
839 | } | |
840 | ||
4e3c1b9b MD |
841 | /* |
842 | * Only used internally at session destruction. | |
843 | */ | |
a90917c3 | 844 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 845 | { |
4ecb5ad5 | 846 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
847 | int ret = -EINVAL; |
848 | ||
3c997079 MD |
849 | if (!event->registered) |
850 | return 0; | |
851 | ||
4ecb5ad5 | 852 | desc = event->desc; |
38d024ae | 853 | switch (event->instrumentation) { |
ab2277d6 | 854 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 855 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 856 | event->desc->probe_callback, |
11b5a3c2 | 857 | event); |
baf20995 | 858 | break; |
ab2277d6 | 859 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 860 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
861 | ret = 0; |
862 | break; | |
7371f44c MD |
863 | case LTTNG_KERNEL_KRETPROBE: |
864 | lttng_kretprobes_unregister(event); | |
865 | ret = 0; | |
866 | break; | |
ab2277d6 | 867 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
868 | lttng_ftrace_unregister(event); |
869 | ret = 0; | |
870 | break; | |
33a39a3c | 871 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
872 | ret = lttng_syscall_filter_disable(event->chan, |
873 | desc->name); | |
874 | break; | |
875 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
876 | ret = 0; |
877 | break; | |
149b9a9d YB |
878 | case LTTNG_KERNEL_UPROBE: |
879 | lttng_uprobes_unregister(event); | |
880 | ret = 0; | |
881 | break; | |
baf20995 MD |
882 | default: |
883 | WARN_ON_ONCE(1); | |
884 | } | |
3c997079 MD |
885 | if (!ret) |
886 | event->registered = 0; | |
dda6a249 MD |
887 | return ret; |
888 | } | |
889 | ||
890 | /* | |
891 | * Only used internally at session destruction. | |
892 | */ | |
be066e6c | 893 | static |
a90917c3 | 894 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 895 | { |
edeb3137 MD |
896 | switch (event->instrumentation) { |
897 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 898 | lttng_event_put(event->desc); |
edeb3137 MD |
899 | break; |
900 | case LTTNG_KERNEL_KPROBE: | |
901 | module_put(event->desc->owner); | |
902 | lttng_kprobes_destroy_private(event); | |
903 | break; | |
7371f44c MD |
904 | case LTTNG_KERNEL_KRETPROBE: |
905 | module_put(event->desc->owner); | |
906 | lttng_kretprobes_destroy_private(event); | |
907 | break; | |
edeb3137 MD |
908 | case LTTNG_KERNEL_FUNCTION: |
909 | module_put(event->desc->owner); | |
910 | lttng_ftrace_destroy_private(event); | |
911 | break; | |
259b6cb3 | 912 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 913 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 914 | break; |
149b9a9d YB |
915 | case LTTNG_KERNEL_UPROBE: |
916 | module_put(event->desc->owner); | |
917 | lttng_uprobes_destroy_private(event); | |
918 | break; | |
edeb3137 MD |
919 | default: |
920 | WARN_ON_ONCE(1); | |
921 | } | |
dda6a249 | 922 | list_del(&event->list); |
8070f5c0 | 923 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 924 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
925 | } |
926 | ||
e0130fab MD |
927 | int lttng_session_track_pid(struct lttng_session *session, int pid) |
928 | { | |
929 | int ret; | |
930 | ||
931 | if (pid < -1) | |
932 | return -EINVAL; | |
933 | mutex_lock(&sessions_mutex); | |
934 | if (pid == -1) { | |
935 | /* track all pids: destroy tracker. */ | |
936 | if (session->pid_tracker) { | |
937 | struct lttng_pid_tracker *lpf; | |
938 | ||
939 | lpf = session->pid_tracker; | |
940 | rcu_assign_pointer(session->pid_tracker, NULL); | |
941 | synchronize_trace(); | |
942 | lttng_pid_tracker_destroy(lpf); | |
943 | } | |
944 | ret = 0; | |
945 | } else { | |
946 | if (!session->pid_tracker) { | |
947 | struct lttng_pid_tracker *lpf; | |
948 | ||
949 | lpf = lttng_pid_tracker_create(); | |
950 | if (!lpf) { | |
951 | ret = -ENOMEM; | |
952 | goto unlock; | |
953 | } | |
954 | ret = lttng_pid_tracker_add(lpf, pid); | |
955 | rcu_assign_pointer(session->pid_tracker, lpf); | |
956 | } else { | |
957 | ret = lttng_pid_tracker_add(session->pid_tracker, pid); | |
958 | } | |
959 | } | |
960 | unlock: | |
961 | mutex_unlock(&sessions_mutex); | |
962 | return ret; | |
963 | } | |
964 | ||
965 | int lttng_session_untrack_pid(struct lttng_session *session, int pid) | |
966 | { | |
967 | int ret; | |
968 | ||
969 | if (pid < -1) | |
970 | return -EINVAL; | |
971 | mutex_lock(&sessions_mutex); | |
972 | if (pid == -1) { | |
973 | /* untrack all pids: replace by empty tracker. */ | |
974 | struct lttng_pid_tracker *old_lpf = session->pid_tracker; | |
975 | struct lttng_pid_tracker *lpf; | |
976 | ||
977 | lpf = lttng_pid_tracker_create(); | |
978 | if (!lpf) { | |
979 | ret = -ENOMEM; | |
980 | goto unlock; | |
981 | } | |
982 | rcu_assign_pointer(session->pid_tracker, lpf); | |
983 | synchronize_trace(); | |
984 | if (old_lpf) | |
985 | lttng_pid_tracker_destroy(old_lpf); | |
986 | ret = 0; | |
987 | } else { | |
988 | if (!session->pid_tracker) { | |
989 | ret = -ENOENT; | |
990 | goto unlock; | |
991 | } | |
992 | ret = lttng_pid_tracker_del(session->pid_tracker, pid); | |
993 | } | |
994 | unlock: | |
995 | mutex_unlock(&sessions_mutex); | |
996 | return ret; | |
997 | } | |
998 | ||
7e6f9ef6 MD |
999 | static |
1000 | void *pid_list_start(struct seq_file *m, loff_t *pos) | |
1001 | { | |
1002 | struct lttng_session *session = m->private; | |
1003 | struct lttng_pid_tracker *lpf; | |
1004 | struct lttng_pid_hash_node *e; | |
1005 | int iter = 0, i; | |
1006 | ||
1007 | mutex_lock(&sessions_mutex); | |
1008 | lpf = session->pid_tracker; | |
1009 | if (lpf) { | |
1010 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1011 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1012 | ||
f934e302 | 1013 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1014 | if (iter++ >= *pos) |
1015 | return e; | |
1016 | } | |
1017 | } | |
1018 | } else { | |
1019 | /* PID tracker disabled. */ | |
1020 | if (iter >= *pos && iter == 0) { | |
1021 | return session; /* empty tracker */ | |
1022 | } | |
1023 | iter++; | |
1024 | } | |
1025 | /* End of list */ | |
1026 | return NULL; | |
1027 | } | |
1028 | ||
1029 | /* Called with sessions_mutex held. */ | |
1030 | static | |
1031 | void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1032 | { | |
1033 | struct lttng_session *session = m->private; | |
1034 | struct lttng_pid_tracker *lpf; | |
1035 | struct lttng_pid_hash_node *e; | |
1036 | int iter = 0, i; | |
1037 | ||
1038 | (*ppos)++; | |
1039 | lpf = session->pid_tracker; | |
1040 | if (lpf) { | |
1041 | for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) { | |
1042 | struct hlist_head *head = &lpf->pid_hash[i]; | |
1043 | ||
f934e302 | 1044 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1045 | if (iter++ >= *ppos) |
1046 | return e; | |
1047 | } | |
1048 | } | |
1049 | } else { | |
1050 | /* PID tracker disabled. */ | |
1051 | if (iter >= *ppos && iter == 0) | |
1052 | return session; /* empty tracker */ | |
1053 | iter++; | |
1054 | } | |
1055 | ||
1056 | /* End of list */ | |
1057 | return NULL; | |
1058 | } | |
1059 | ||
1060 | static | |
1061 | void pid_list_stop(struct seq_file *m, void *p) | |
1062 | { | |
1063 | mutex_unlock(&sessions_mutex); | |
1064 | } | |
1065 | ||
1066 | static | |
1067 | int pid_list_show(struct seq_file *m, void *p) | |
1068 | { | |
1069 | int pid; | |
1070 | ||
1071 | if (p == m->private) { | |
1072 | /* Tracker disabled. */ | |
1073 | pid = -1; | |
1074 | } else { | |
1075 | const struct lttng_pid_hash_node *e = p; | |
1076 | ||
1077 | pid = lttng_pid_tracker_get_node_pid(e); | |
1078 | } | |
1079 | seq_printf(m, "process { pid = %d; };\n", pid); | |
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | static | |
1084 | const struct seq_operations lttng_tracker_pids_list_seq_ops = { | |
1085 | .start = pid_list_start, | |
1086 | .next = pid_list_next, | |
1087 | .stop = pid_list_stop, | |
1088 | .show = pid_list_show, | |
1089 | }; | |
1090 | ||
1091 | static | |
1092 | int lttng_tracker_pids_list_open(struct inode *inode, struct file *file) | |
1093 | { | |
1094 | return seq_open(file, <tng_tracker_pids_list_seq_ops); | |
1095 | } | |
1096 | ||
1097 | static | |
1098 | int lttng_tracker_pids_list_release(struct inode *inode, struct file *file) | |
1099 | { | |
1100 | struct seq_file *m = file->private_data; | |
1101 | struct lttng_session *session = m->private; | |
1102 | int ret; | |
1103 | ||
1104 | WARN_ON_ONCE(!session); | |
1105 | ret = seq_release(inode, file); | |
1106 | if (!ret && session) | |
1107 | fput(session->file); | |
1108 | return ret; | |
1109 | } | |
1110 | ||
1111 | const struct file_operations lttng_tracker_pids_list_fops = { | |
1112 | .owner = THIS_MODULE, | |
1113 | .open = lttng_tracker_pids_list_open, | |
1114 | .read = seq_read, | |
1115 | .llseek = seq_lseek, | |
1116 | .release = lttng_tracker_pids_list_release, | |
1117 | }; | |
1118 | ||
1119 | int lttng_session_list_tracker_pids(struct lttng_session *session) | |
1120 | { | |
1121 | struct file *tracker_pids_list_file; | |
1122 | struct seq_file *m; | |
1123 | int file_fd, ret; | |
1124 | ||
1125 | file_fd = lttng_get_unused_fd(); | |
1126 | if (file_fd < 0) { | |
1127 | ret = file_fd; | |
1128 | goto fd_error; | |
1129 | } | |
1130 | ||
1131 | tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]", | |
1132 | <tng_tracker_pids_list_fops, | |
1133 | NULL, O_RDWR); | |
1134 | if (IS_ERR(tracker_pids_list_file)) { | |
1135 | ret = PTR_ERR(tracker_pids_list_file); | |
1136 | goto file_error; | |
1137 | } | |
9c1f4643 MD |
1138 | if (atomic_long_add_unless(&session->file->f_count, |
1139 | 1, INT_MAX) == INT_MAX) { | |
1140 | goto refcount_error; | |
1141 | } | |
7e6f9ef6 MD |
1142 | ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file); |
1143 | if (ret < 0) | |
1144 | goto open_error; | |
1145 | m = tracker_pids_list_file->private_data; | |
1146 | m->private = session; | |
1147 | fd_install(file_fd, tracker_pids_list_file); | |
7e6f9ef6 MD |
1148 | |
1149 | return file_fd; | |
1150 | ||
1151 | open_error: | |
9c1f4643 MD |
1152 | atomic_long_dec(&session->file->f_count); |
1153 | refcount_error: | |
7e6f9ef6 MD |
1154 | fput(tracker_pids_list_file); |
1155 | file_error: | |
1156 | put_unused_fd(file_fd); | |
1157 | fd_error: | |
1158 | return ret; | |
1159 | } | |
1160 | ||
3c997079 MD |
1161 | /* |
1162 | * Enabler management. | |
1163 | */ | |
1164 | static | |
4993071a PP |
1165 | int lttng_match_enabler_star_glob(const char *desc_name, |
1166 | const char *pattern) | |
3c997079 | 1167 | { |
cbc19040 MD |
1168 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1169 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1170 | return 0; |
1171 | return 1; | |
1172 | } | |
1173 | ||
1174 | static | |
4ecb5ad5 MD |
1175 | int lttng_match_enabler_name(const char *desc_name, |
1176 | const char *name) | |
3c997079 | 1177 | { |
4ecb5ad5 | 1178 | if (strcmp(desc_name, name)) |
3c997079 MD |
1179 | return 0; |
1180 | return 1; | |
1181 | } | |
1182 | ||
1183 | static | |
1184 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1185 | struct lttng_enabler *enabler) | |
1186 | { | |
4ecb5ad5 MD |
1187 | const char *desc_name, *enabler_name; |
1188 | ||
1189 | enabler_name = enabler->event_param.name; | |
1190 | switch (enabler->event_param.instrumentation) { | |
1191 | case LTTNG_KERNEL_TRACEPOINT: | |
1192 | desc_name = desc->name; | |
1193 | break; | |
1194 | case LTTNG_KERNEL_SYSCALL: | |
1195 | desc_name = desc->name; | |
1196 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1197 | desc_name += strlen("compat_"); | |
1198 | if (!strncmp(desc_name, "syscall_exit_", | |
1199 | strlen("syscall_exit_"))) { | |
1200 | desc_name += strlen("syscall_exit_"); | |
1201 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1202 | strlen("syscall_entry_"))) { | |
1203 | desc_name += strlen("syscall_entry_"); | |
1204 | } else { | |
1205 | WARN_ON_ONCE(1); | |
1206 | return -EINVAL; | |
1207 | } | |
1208 | break; | |
1209 | default: | |
1210 | WARN_ON_ONCE(1); | |
1211 | return -EINVAL; | |
1212 | } | |
3c997079 | 1213 | switch (enabler->type) { |
4993071a PP |
1214 | case LTTNG_ENABLER_STAR_GLOB: |
1215 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
3c997079 | 1216 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1217 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1218 | default: |
1219 | return -EINVAL; | |
1220 | } | |
1221 | } | |
1222 | ||
1223 | static | |
1224 | int lttng_event_match_enabler(struct lttng_event *event, | |
1225 | struct lttng_enabler *enabler) | |
1226 | { | |
33a39a3c MD |
1227 | if (enabler->event_param.instrumentation != event->instrumentation) |
1228 | return 0; | |
3c997079 MD |
1229 | if (lttng_desc_match_enabler(event->desc, enabler) |
1230 | && event->chan == enabler->chan) | |
1231 | return 1; | |
1232 | else | |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | static | |
1237 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1238 | struct lttng_enabler *enabler) | |
1239 | { | |
1240 | struct lttng_enabler_ref *enabler_ref; | |
1241 | ||
1242 | list_for_each_entry(enabler_ref, | |
1243 | &event->enablers_ref_head, node) { | |
1244 | if (enabler_ref->ref == enabler) | |
1245 | return enabler_ref; | |
1246 | } | |
1247 | return NULL; | |
1248 | } | |
1249 | ||
3c997079 | 1250 | static |
33a39a3c | 1251 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1252 | { |
1253 | struct lttng_session *session = enabler->chan->session; | |
1254 | struct lttng_probe_desc *probe_desc; | |
1255 | const struct lttng_event_desc *desc; | |
1256 | int i; | |
1257 | struct list_head *probe_list; | |
1258 | ||
1259 | probe_list = lttng_get_probe_list_head(); | |
1260 | /* | |
1261 | * For each probe event, if we find that a probe event matches | |
1262 | * our enabler, create an associated lttng_event if not | |
1263 | * already present. | |
1264 | */ | |
1265 | list_for_each_entry(probe_desc, probe_list, head) { | |
1266 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1267 | int found = 0; | |
1268 | struct hlist_head *head; | |
1269 | const char *event_name; | |
1270 | size_t name_len; | |
1271 | uint32_t hash; | |
1272 | struct lttng_event *event; | |
1273 | ||
1274 | desc = probe_desc->event_desc[i]; | |
1275 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1276 | continue; | |
1277 | event_name = desc->name; | |
1278 | name_len = strlen(event_name); | |
1279 | ||
1280 | /* | |
1281 | * Check if already created. | |
1282 | */ | |
1283 | hash = jhash(event_name, name_len, 0); | |
1284 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1285 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1286 | if (event->desc == desc |
1287 | && event->chan == enabler->chan) | |
1288 | found = 1; | |
1289 | } | |
1290 | if (found) | |
1291 | continue; | |
1292 | ||
1293 | /* | |
1294 | * We need to create an event for this | |
1295 | * event probe. | |
1296 | */ | |
1297 | event = _lttng_event_create(enabler->chan, | |
1298 | NULL, NULL, desc, | |
1299 | LTTNG_KERNEL_TRACEPOINT); | |
1300 | if (!event) { | |
1301 | printk(KERN_INFO "Unable to create event %s\n", | |
1302 | probe_desc->event_desc[i]->name); | |
1303 | } | |
1304 | } | |
1305 | } | |
1306 | } | |
1307 | ||
33a39a3c MD |
1308 | static |
1309 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1310 | { | |
1311 | int ret; | |
1312 | ||
1313 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1314 | WARN_ON_ONCE(ret); | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * Create struct lttng_event if it is missing and present in the list of | |
1319 | * tracepoint probes. | |
1320 | * Should be called with sessions mutex held. | |
1321 | */ | |
1322 | static | |
1323 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1324 | { | |
1325 | switch (enabler->event_param.instrumentation) { | |
1326 | case LTTNG_KERNEL_TRACEPOINT: | |
1327 | lttng_create_tracepoint_if_missing(enabler); | |
1328 | break; | |
1329 | case LTTNG_KERNEL_SYSCALL: | |
1330 | lttng_create_syscall_if_missing(enabler); | |
1331 | break; | |
1332 | default: | |
1333 | WARN_ON_ONCE(1); | |
1334 | break; | |
1335 | } | |
1336 | } | |
1337 | ||
3c997079 MD |
1338 | /* |
1339 | * Create events associated with an enabler (if not already present), | |
1340 | * and add backward reference from the event to the enabler. | |
1341 | * Should be called with sessions mutex held. | |
1342 | */ | |
1343 | static | |
1344 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1345 | { | |
1346 | struct lttng_session *session = enabler->chan->session; | |
1347 | struct lttng_event *event; | |
1348 | ||
1349 | /* First ensure that probe events are created for this enabler. */ | |
1350 | lttng_create_event_if_missing(enabler); | |
1351 | ||
1352 | /* For each event matching enabler in session event list. */ | |
1353 | list_for_each_entry(event, &session->events, list) { | |
1354 | struct lttng_enabler_ref *enabler_ref; | |
1355 | ||
1356 | if (!lttng_event_match_enabler(event, enabler)) | |
1357 | continue; | |
1358 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1359 | if (!enabler_ref) { | |
1360 | /* | |
1361 | * If no backward ref, create it. | |
1362 | * Add backward ref from event to enabler. | |
1363 | */ | |
1364 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1365 | if (!enabler_ref) | |
1366 | return -ENOMEM; | |
1367 | enabler_ref->ref = enabler; | |
1368 | list_add(&enabler_ref->node, | |
1369 | &event->enablers_ref_head); | |
1370 | } | |
1371 | ||
f127e61e MD |
1372 | /* |
1373 | * Link filter bytecodes if not linked yet. | |
1374 | */ | |
1375 | lttng_enabler_event_link_bytecode(event, enabler); | |
1376 | ||
3c997079 MD |
1377 | /* TODO: merge event context. */ |
1378 | } | |
1379 | return 0; | |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | * Called at module load: connect the probe on all enablers matching | |
1384 | * this event. | |
1385 | * Called with sessions lock held. | |
1386 | */ | |
1387 | int lttng_fix_pending_events(void) | |
1388 | { | |
1389 | struct lttng_session *session; | |
1390 | ||
1391 | list_for_each_entry(session, &sessions, list) | |
1392 | lttng_session_lazy_sync_enablers(session); | |
1393 | return 0; | |
1394 | } | |
1395 | ||
1396 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1397 | struct lttng_kernel_event *event_param, | |
1398 | struct lttng_channel *chan) | |
1399 | { | |
1400 | struct lttng_enabler *enabler; | |
1401 | ||
1402 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1403 | if (!enabler) | |
1404 | return NULL; | |
1405 | enabler->type = type; | |
07dfc1d0 | 1406 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1407 | memcpy(&enabler->event_param, event_param, |
1408 | sizeof(enabler->event_param)); | |
1409 | enabler->chan = chan; | |
1410 | /* ctx left NULL */ | |
4fd19d8a | 1411 | enabler->enabled = 0; |
3c997079 MD |
1412 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1413 | mutex_lock(&sessions_mutex); | |
1414 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1415 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1416 | mutex_unlock(&sessions_mutex); | |
1417 | return enabler; | |
1418 | } | |
1419 | ||
1420 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1421 | { | |
1422 | mutex_lock(&sessions_mutex); | |
1423 | enabler->enabled = 1; | |
1424 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1425 | mutex_unlock(&sessions_mutex); | |
1426 | return 0; | |
1427 | } | |
1428 | ||
1429 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1430 | { | |
1431 | mutex_lock(&sessions_mutex); | |
1432 | enabler->enabled = 0; | |
1433 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1434 | mutex_unlock(&sessions_mutex); | |
1435 | return 0; | |
1436 | } | |
1437 | ||
07dfc1d0 MD |
1438 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1439 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1440 | { | |
1441 | struct lttng_filter_bytecode_node *bytecode_node; | |
1442 | uint32_t bytecode_len; | |
1443 | int ret; | |
1444 | ||
1445 | ret = get_user(bytecode_len, &bytecode->len); | |
1446 | if (ret) | |
1447 | return ret; | |
1448 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1449 | GFP_KERNEL); | |
1450 | if (!bytecode_node) | |
1451 | return -ENOMEM; | |
1452 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1453 | sizeof(*bytecode) + bytecode_len); | |
1454 | if (ret) | |
1455 | goto error_free; | |
1456 | bytecode_node->enabler = enabler; | |
1457 | /* Enforce length based on allocated size */ | |
1458 | bytecode_node->bc.len = bytecode_len; | |
1459 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1460 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1461 | return 0; | |
1462 | ||
1463 | error_free: | |
1464 | kfree(bytecode_node); | |
1465 | return ret; | |
1466 | } | |
1467 | ||
3aed4dca FD |
1468 | int lttng_event_add_callsite(struct lttng_event *event, |
1469 | struct lttng_kernel_event_callsite __user *callsite) | |
1470 | { | |
1471 | ||
1472 | switch (event->instrumentation) { | |
1473 | case LTTNG_KERNEL_UPROBE: | |
1474 | return lttng_uprobes_add_callsite(event, callsite); | |
1475 | default: | |
1476 | return -EINVAL; | |
1477 | } | |
1478 | } | |
1479 | ||
3c997079 MD |
1480 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1481 | struct lttng_kernel_context *context_param) | |
1482 | { | |
1483 | return -ENOSYS; | |
1484 | } | |
1485 | ||
1486 | static | |
1487 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1488 | { | |
07dfc1d0 MD |
1489 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1490 | ||
1491 | /* Destroy filter bytecode */ | |
1492 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1493 | &enabler->filter_bytecode_head, node) { | |
1494 | kfree(filter_node); | |
1495 | } | |
1496 | ||
3c997079 MD |
1497 | /* Destroy contexts */ |
1498 | lttng_destroy_context(enabler->ctx); | |
1499 | ||
1500 | list_del(&enabler->node); | |
1501 | kfree(enabler); | |
1502 | } | |
1503 | ||
1504 | /* | |
1505 | * lttng_session_sync_enablers should be called just before starting a | |
1506 | * session. | |
1507 | * Should be called with sessions mutex held. | |
1508 | */ | |
1509 | static | |
1510 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1511 | { | |
1512 | struct lttng_enabler *enabler; | |
1513 | struct lttng_event *event; | |
1514 | ||
1515 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1516 | lttng_enabler_ref_events(enabler); | |
1517 | /* | |
1518 | * For each event, if at least one of its enablers is enabled, | |
1519 | * and its channel and session transient states are enabled, we | |
1520 | * enable the event, else we disable it. | |
1521 | */ | |
1522 | list_for_each_entry(event, &session->events, list) { | |
1523 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1524 | struct lttng_bytecode_runtime *runtime; |
1525 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1526 | |
4ecb5ad5 MD |
1527 | switch (event->instrumentation) { |
1528 | case LTTNG_KERNEL_TRACEPOINT: | |
1529 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1530 | /* Enable events */ |
1531 | list_for_each_entry(enabler_ref, | |
1532 | &event->enablers_ref_head, node) { | |
1533 | if (enabler_ref->ref->enabled) { | |
1534 | enabled = 1; | |
1535 | break; | |
1536 | } | |
1537 | } | |
4ecb5ad5 MD |
1538 | break; |
1539 | default: | |
3c997079 MD |
1540 | /* Not handled with lazy sync. */ |
1541 | continue; | |
1542 | } | |
1543 | /* | |
1544 | * Enabled state is based on union of enablers, with | |
1545 | * intesection of session and channel transient enable | |
1546 | * states. | |
1547 | */ | |
1548 | enabled = enabled && session->tstate && event->chan->tstate; | |
1549 | ||
a8f2d0c7 | 1550 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1551 | /* |
1552 | * Sync tracepoint registration with event enabled | |
1553 | * state. | |
1554 | */ | |
1555 | if (enabled) { | |
1556 | register_event(event); | |
1557 | } else { | |
1558 | _lttng_event_unregister(event); | |
1559 | } | |
07dfc1d0 MD |
1560 | |
1561 | /* Check if has enablers without bytecode enabled */ | |
1562 | list_for_each_entry(enabler_ref, | |
1563 | &event->enablers_ref_head, node) { | |
1564 | if (enabler_ref->ref->enabled | |
1565 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1566 | has_enablers_without_bytecode = 1; | |
1567 | break; | |
1568 | } | |
1569 | } | |
1570 | event->has_enablers_without_bytecode = | |
1571 | has_enablers_without_bytecode; | |
1572 | ||
1573 | /* Enable filters */ | |
1574 | list_for_each_entry(runtime, | |
f127e61e | 1575 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1576 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1577 | } |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * Apply enablers to session events, adding events to session if need | |
1582 | * be. It is required after each modification applied to an active | |
1583 | * session, and right before session "start". | |
1584 | * "lazy" sync means we only sync if required. | |
1585 | * Should be called with sessions mutex held. | |
1586 | */ | |
1587 | static | |
1588 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1589 | { | |
1590 | /* We can skip if session is not active */ | |
1591 | if (!session->active) | |
1592 | return; | |
1593 | lttng_session_sync_enablers(session); | |
1594 | } | |
1595 | ||
1ec3f75a | 1596 | /* |
d83004aa JD |
1597 | * Serialize at most one packet worth of metadata into a metadata |
1598 | * channel. | |
92d9f5e6 MD |
1599 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1600 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1601 | * allows us to do racy operations such as looking for remaining space left in | |
1602 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1603 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1604 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1605 | * Returns the number of bytes written in the channel, 0 if no data |
1606 | * was written and a negative value on error. | |
1ec3f75a | 1607 | */ |
b3b8072b MD |
1608 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1609 | struct channel *chan) | |
d83004aa JD |
1610 | { |
1611 | struct lib_ring_buffer_ctx ctx; | |
1612 | int ret = 0; | |
1613 | size_t len, reserve_len; | |
1614 | ||
f613e3e6 | 1615 | /* |
92d9f5e6 MD |
1616 | * Ensure we support mutiple get_next / put sequences followed by |
1617 | * put_next. The metadata cache lock protects reading the metadata | |
1618 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1619 | * "flush" operations on the buffer invoked by different processes. | |
1620 | * Moreover, since the metadata cache memory can be reallocated, we | |
1621 | * need to have exclusive access against updates even though we only | |
1622 | * read it. | |
f613e3e6 | 1623 | */ |
92d9f5e6 | 1624 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1625 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1626 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1627 | goto end; |
f613e3e6 | 1628 | |
9616f0bf JD |
1629 | /* Metadata regenerated, change the version. */ |
1630 | if (stream->metadata_cache->version != stream->version) | |
1631 | stream->version = stream->metadata_cache->version; | |
1632 | ||
d83004aa | 1633 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1634 | stream->metadata_in; |
9de2c215 | 1635 | if (!len) |
de23d59d | 1636 | goto end; |
d83004aa | 1637 | reserve_len = min_t(size_t, |
b3b8072b | 1638 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1639 | len); |
b3b8072b | 1640 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1641 | sizeof(char), -1); |
1642 | /* | |
1643 | * If reservation failed, return an error to the caller. | |
1644 | */ | |
b3b8072b | 1645 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1646 | if (ret != 0) { |
1647 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1648 | goto end; | |
1649 | } | |
b3b8072b | 1650 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1651 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1652 | reserve_len); |
b3b8072b | 1653 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1654 | stream->metadata_in += reserve_len; |
d83004aa JD |
1655 | ret = reserve_len; |
1656 | ||
1657 | end: | |
92d9f5e6 | 1658 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1659 | return ret; |
1660 | } | |
1661 | ||
1662 | /* | |
1663 | * Write the metadata to the metadata cache. | |
1664 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1665 | * The metadata cache lock protects us from concurrent read access from |
1666 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1667 | */ |
a90917c3 | 1668 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1669 | const char *fmt, ...) |
1670 | { | |
c099397a | 1671 | char *str; |
d83004aa | 1672 | size_t len; |
c099397a | 1673 | va_list ap; |
d83004aa | 1674 | struct lttng_metadata_stream *stream; |
c099397a | 1675 | |
a8f2d0c7 | 1676 | WARN_ON_ONCE(!READ_ONCE(session->active)); |
c099397a MD |
1677 | |
1678 | va_start(ap, fmt); | |
1679 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1680 | va_end(ap); | |
1681 | if (!str) | |
1682 | return -ENOMEM; | |
1683 | ||
1ec3f75a | 1684 | len = strlen(str); |
92d9f5e6 | 1685 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1686 | if (session->metadata_cache->metadata_written + len > |
1687 | session->metadata_cache->cache_alloc) { | |
1688 | char *tmp_cache_realloc; | |
1689 | unsigned int tmp_cache_alloc_size; | |
1690 | ||
1691 | tmp_cache_alloc_size = max_t(unsigned int, | |
1692 | session->metadata_cache->cache_alloc + len, | |
1693 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 1694 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1695 | if (!tmp_cache_realloc) |
1696 | goto err; | |
a606b6e8 ML |
1697 | if (session->metadata_cache->data) { |
1698 | memcpy(tmp_cache_realloc, | |
1699 | session->metadata_cache->data, | |
1700 | session->metadata_cache->cache_alloc); | |
1701 | vfree(session->metadata_cache->data); | |
1702 | } | |
1703 | ||
d83004aa JD |
1704 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1705 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1706 | } |
d83004aa JD |
1707 | memcpy(session->metadata_cache->data + |
1708 | session->metadata_cache->metadata_written, | |
1709 | str, len); | |
1710 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1711 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1712 | kfree(str); |
d83004aa JD |
1713 | |
1714 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1715 | wake_up_interruptible(&stream->read_wait); | |
1716 | ||
1717 | return 0; | |
1718 | ||
1719 | err: | |
92d9f5e6 | 1720 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1721 | kfree(str); |
1722 | return -ENOMEM; | |
c099397a MD |
1723 | } |
1724 | ||
f513b2bf MD |
1725 | static |
1726 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1727 | { | |
1728 | size_t i; | |
1729 | ||
1730 | for (i = 0; i < nesting; i++) { | |
1731 | int ret; | |
1732 | ||
1733 | ret = lttng_metadata_printf(session, " "); | |
1734 | if (ret) { | |
1735 | return ret; | |
1736 | } | |
1737 | } | |
1738 | return 0; | |
1739 | } | |
1740 | ||
1741 | /* | |
1742 | * Must be called with sessions_mutex held. | |
1743 | */ | |
1744 | static | |
1745 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1746 | const struct lttng_type *type, | |
1747 | size_t nesting) | |
1748 | { | |
1749 | int ret; | |
1750 | uint32_t i, nr_fields; | |
1751 | ||
1752 | ret = print_tabs(session, nesting); | |
1753 | if (ret) | |
1754 | return ret; | |
1755 | ret = lttng_metadata_printf(session, | |
1756 | "struct {\n"); | |
1757 | if (ret) | |
1758 | return ret; | |
1759 | nr_fields = type->u._struct.nr_fields; | |
1760 | for (i = 0; i < nr_fields; i++) { | |
1761 | const struct lttng_event_field *iter_field; | |
1762 | ||
1763 | iter_field = &type->u._struct.fields[i]; | |
1764 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1765 | if (ret) | |
1766 | return ret; | |
1767 | } | |
1768 | ret = print_tabs(session, nesting); | |
1769 | if (ret) | |
1770 | return ret; | |
1771 | ret = lttng_metadata_printf(session, | |
1772 | "}"); | |
1773 | return ret; | |
1774 | } | |
1775 | ||
1776 | /* | |
1777 | * Must be called with sessions_mutex held. | |
1778 | */ | |
1779 | static | |
1780 | int _lttng_struct_statedump(struct lttng_session *session, | |
1781 | const struct lttng_event_field *field, | |
1782 | size_t nesting) | |
1783 | { | |
1784 | int ret; | |
1785 | ||
1786 | ret = _lttng_struct_type_statedump(session, | |
1787 | &field->type, nesting); | |
1788 | if (ret) | |
1789 | return ret; | |
1790 | ret = lttng_metadata_printf(session, | |
1791 | "_%s;\n", | |
1792 | field->name); | |
1793 | return ret; | |
1794 | } | |
1795 | ||
65c85aa6 MD |
1796 | /* |
1797 | * Must be called with sessions_mutex held. | |
1798 | */ | |
1799 | static | |
1800 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1801 | const struct lttng_type *type, | |
1802 | size_t nesting) | |
1803 | { | |
1804 | int ret; | |
1805 | uint32_t i, nr_choices; | |
1806 | ||
1807 | ret = print_tabs(session, nesting); | |
1808 | if (ret) | |
1809 | return ret; | |
1810 | ret = lttng_metadata_printf(session, | |
1811 | "variant <_%s> {\n", | |
1812 | type->u.variant.tag_name); | |
1813 | if (ret) | |
1814 | return ret; | |
1815 | nr_choices = type->u.variant.nr_choices; | |
1816 | for (i = 0; i < nr_choices; i++) { | |
1817 | const struct lttng_event_field *iter_field; | |
1818 | ||
1819 | iter_field = &type->u.variant.choices[i]; | |
1820 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); | |
1821 | if (ret) | |
1822 | return ret; | |
1823 | } | |
1824 | ret = print_tabs(session, nesting); | |
1825 | if (ret) | |
1826 | return ret; | |
1827 | ret = lttng_metadata_printf(session, | |
1828 | "}"); | |
1829 | return ret; | |
1830 | } | |
1831 | ||
1832 | /* | |
1833 | * Must be called with sessions_mutex held. | |
1834 | */ | |
1835 | static | |
1836 | int _lttng_variant_statedump(struct lttng_session *session, | |
1837 | const struct lttng_event_field *field, | |
1838 | size_t nesting) | |
1839 | { | |
1840 | int ret; | |
1841 | ||
1842 | ret = _lttng_variant_type_statedump(session, | |
1843 | &field->type, nesting); | |
1844 | if (ret) | |
1845 | return ret; | |
1846 | ret = lttng_metadata_printf(session, | |
1847 | "_%s;\n", | |
1848 | field->name); | |
1849 | return ret; | |
1850 | } | |
1851 | ||
f513b2bf MD |
1852 | /* |
1853 | * Must be called with sessions_mutex held. | |
1854 | */ | |
1855 | static | |
1856 | int _lttng_array_compound_statedump(struct lttng_session *session, | |
1857 | const struct lttng_event_field *field, | |
1858 | size_t nesting) | |
1859 | { | |
1860 | int ret; | |
1861 | const struct lttng_type *elem_type; | |
1862 | ||
65c85aa6 | 1863 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1864 | elem_type = field->type.u.array_compound.elem_type; |
1865 | switch (elem_type->atype) { | |
1866 | case atype_struct: | |
1867 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1868 | if (ret) | |
1869 | return ret; | |
1870 | break; | |
65c85aa6 MD |
1871 | case atype_variant: |
1872 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1873 | if (ret) | |
1874 | return ret; | |
1875 | break; | |
f513b2bf MD |
1876 | default: |
1877 | return -EINVAL; | |
1878 | } | |
1879 | ret = lttng_metadata_printf(session, | |
1880 | " _%s[%u];\n", | |
1881 | field->name, | |
1882 | field->type.u.array_compound.length); | |
1883 | return ret; | |
1884 | } | |
1885 | ||
1886 | /* | |
1887 | * Must be called with sessions_mutex held. | |
1888 | */ | |
1889 | static | |
1890 | int _lttng_sequence_compound_statedump(struct lttng_session *session, | |
1891 | const struct lttng_event_field *field, | |
1892 | size_t nesting) | |
1893 | { | |
1894 | int ret; | |
1895 | const char *length_name; | |
1896 | const struct lttng_type *elem_type; | |
1897 | ||
1898 | length_name = field->type.u.sequence_compound.length_name; | |
1899 | ||
65c85aa6 | 1900 | /* Only array of structures and variants are currently supported. */ |
f513b2bf MD |
1901 | elem_type = field->type.u.sequence_compound.elem_type; |
1902 | switch (elem_type->atype) { | |
1903 | case atype_struct: | |
1904 | ret = _lttng_struct_type_statedump(session, elem_type, nesting); | |
1905 | if (ret) | |
1906 | return ret; | |
1907 | break; | |
65c85aa6 MD |
1908 | case atype_variant: |
1909 | ret = _lttng_variant_type_statedump(session, elem_type, nesting); | |
1910 | if (ret) | |
1911 | return ret; | |
1912 | break; | |
f513b2bf MD |
1913 | default: |
1914 | return -EINVAL; | |
1915 | } | |
1916 | ret = lttng_metadata_printf(session, | |
1917 | " _%s[ _%s ];\n", | |
1918 | field->name, | |
1919 | length_name); | |
1920 | return ret; | |
1921 | } | |
1922 | ||
141ddf28 MD |
1923 | /* |
1924 | * Must be called with sessions_mutex held. | |
1925 | */ | |
1926 | static | |
1927 | int _lttng_enum_statedump(struct lttng_session *session, | |
1928 | const struct lttng_event_field *field, | |
1929 | size_t nesting) | |
1930 | { | |
1931 | const struct lttng_enum_desc *enum_desc; | |
1932 | const struct lttng_integer_type *container_type; | |
1933 | int ret; | |
1934 | unsigned int i, nr_entries; | |
1935 | ||
1936 | enum_desc = field->type.u.basic.enumeration.desc; | |
1937 | container_type = &field->type.u.basic.enumeration.container_type; | |
1938 | nr_entries = enum_desc->nr_entries; | |
1939 | ||
1940 | ret = print_tabs(session, nesting); | |
1941 | if (ret) | |
1942 | goto end; | |
1943 | ret = lttng_metadata_printf(session, | |
578e68ec | 1944 | "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n", |
141ddf28 MD |
1945 | container_type->size, |
1946 | container_type->alignment, | |
1947 | container_type->signedness, | |
1948 | (container_type->encoding == lttng_encode_none) | |
1949 | ? "none" | |
1950 | : (container_type->encoding == lttng_encode_UTF8) | |
1951 | ? "UTF8" | |
1952 | : "ASCII", | |
578e68ec GB |
1953 | container_type->base, |
1954 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1955 | container_type->reverse_byte_order ? " byte_order = le;" : "" | |
1956 | #else | |
1957 | container_type->reverse_byte_order ? " byte_order = be;" : "" | |
1958 | #endif | |
1959 | ); | |
141ddf28 MD |
1960 | if (ret) |
1961 | goto end; | |
1962 | /* Dump all entries */ | |
1963 | for (i = 0; i < nr_entries; i++) { | |
1964 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
1965 | int j, len; | |
1966 | ||
1967 | ret = print_tabs(session, nesting + 1); | |
1968 | if (ret) | |
1969 | goto end; | |
1970 | ret = lttng_metadata_printf(session, | |
1971 | "\""); | |
1972 | if (ret) | |
1973 | goto end; | |
1974 | len = strlen(entry->string); | |
1975 | /* Escape the character '"' */ | |
1976 | for (j = 0; j < len; j++) { | |
1977 | char c = entry->string[j]; | |
1978 | ||
1979 | switch (c) { | |
1980 | case '"': | |
1981 | ret = lttng_metadata_printf(session, | |
1982 | "\\\""); | |
1983 | break; | |
1984 | case '\\': | |
1985 | ret = lttng_metadata_printf(session, | |
1986 | "\\\\"); | |
1987 | break; | |
1988 | default: | |
1989 | ret = lttng_metadata_printf(session, | |
1990 | "%c", c); | |
1991 | break; | |
1992 | } | |
1993 | if (ret) | |
1994 | goto end; | |
1995 | } | |
08ad1061 PP |
1996 | ret = lttng_metadata_printf(session, "\""); |
1997 | if (ret) | |
1998 | goto end; | |
1999 | ||
2000 | if (entry->options.is_auto) { | |
2001 | ret = lttng_metadata_printf(session, ",\n"); | |
2002 | if (ret) | |
2003 | goto end; | |
141ddf28 | 2004 | } else { |
7c559490 MD |
2005 | ret = lttng_metadata_printf(session, |
2006 | " = "); | |
2007 | if (ret) | |
2008 | goto end; | |
2009 | if (entry->start.signedness) | |
141ddf28 | 2010 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2011 | "%lld", (long long) entry->start.value); |
2012 | else | |
2013 | ret = lttng_metadata_printf(session, | |
2014 | "%llu", entry->start.value); | |
2015 | if (ret) | |
2016 | goto end; | |
2017 | if (entry->start.signedness == entry->end.signedness && | |
2018 | entry->start.value | |
2019 | == entry->end.value) { | |
141ddf28 | 2020 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2021 | ",\n"); |
2022 | } else { | |
2023 | if (entry->end.signedness) { | |
2024 | ret = lttng_metadata_printf(session, | |
2025 | " ... %lld,\n", | |
2026 | (long long) entry->end.value); | |
2027 | } else { | |
2028 | ret = lttng_metadata_printf(session, | |
2029 | " ... %llu,\n", | |
2030 | entry->end.value); | |
2031 | } | |
141ddf28 | 2032 | } |
7c559490 MD |
2033 | if (ret) |
2034 | goto end; | |
141ddf28 | 2035 | } |
141ddf28 MD |
2036 | } |
2037 | ret = print_tabs(session, nesting); | |
2038 | if (ret) | |
2039 | goto end; | |
2040 | ret = lttng_metadata_printf(session, "} _%s;\n", | |
2041 | field->name); | |
2042 | end: | |
2043 | return ret; | |
2044 | } | |
2045 | ||
d83004aa JD |
2046 | /* |
2047 | * Must be called with sessions_mutex held. | |
2048 | */ | |
c099397a | 2049 | static |
a90917c3 | 2050 | int _lttng_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2051 | const struct lttng_event_field *field, |
2052 | size_t nesting) | |
c099397a | 2053 | { |
c099397a | 2054 | int ret = 0; |
c099397a | 2055 | |
8070f5c0 MD |
2056 | switch (field->type.atype) { |
2057 | case atype_integer: | |
f513b2bf MD |
2058 | ret = print_tabs(session, nesting); |
2059 | if (ret) | |
2060 | return ret; | |
8070f5c0 | 2061 | ret = lttng_metadata_printf(session, |
f513b2bf | 2062 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8070f5c0 MD |
2063 | field->type.u.basic.integer.size, |
2064 | field->type.u.basic.integer.alignment, | |
2065 | field->type.u.basic.integer.signedness, | |
2066 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
2067 | ? "none" | |
2068 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
2069 | ? "UTF8" | |
2070 | : "ASCII", | |
2071 | field->type.u.basic.integer.base, | |
5214fa50 | 2072 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2073 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
c099397a | 2074 | #else |
8070f5c0 | 2075 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
c099397a | 2076 | #endif |
8070f5c0 MD |
2077 | field->name); |
2078 | break; | |
2079 | case atype_enum: | |
141ddf28 | 2080 | ret = _lttng_enum_statedump(session, field, nesting); |
8070f5c0 MD |
2081 | break; |
2082 | case atype_array: | |
3834b99f | 2083 | case atype_array_bitfield: |
8070f5c0 MD |
2084 | { |
2085 | const struct lttng_basic_type *elem_type; | |
2086 | ||
2087 | elem_type = &field->type.u.array.elem_type; | |
43803cf2 | 2088 | if (field->type.u.array.elem_alignment) { |
f513b2bf MD |
2089 | ret = print_tabs(session, nesting); |
2090 | if (ret) | |
2091 | return ret; | |
43803cf2 | 2092 | ret = lttng_metadata_printf(session, |
f513b2bf | 2093 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2094 | field->type.u.array.elem_alignment * CHAR_BIT, |
2095 | field->name); | |
2096 | if (ret) | |
2097 | return ret; | |
2098 | } | |
f513b2bf MD |
2099 | ret = print_tabs(session, nesting); |
2100 | if (ret) | |
2101 | return ret; | |
8070f5c0 | 2102 | ret = lttng_metadata_printf(session, |
f513b2bf | 2103 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8070f5c0 MD |
2104 | elem_type->u.basic.integer.size, |
2105 | elem_type->u.basic.integer.alignment, | |
2106 | elem_type->u.basic.integer.signedness, | |
2107 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2108 | ? "none" | |
2109 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
2110 | ? "UTF8" | |
2111 | : "ASCII", | |
2112 | elem_type->u.basic.integer.base, | |
5214fa50 | 2113 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2114 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2115 | #else |
8070f5c0 | 2116 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2117 | #endif |
8070f5c0 MD |
2118 | field->name, field->type.u.array.length); |
2119 | break; | |
2120 | } | |
2121 | case atype_sequence: | |
3834b99f | 2122 | case atype_sequence_bitfield: |
8070f5c0 MD |
2123 | { |
2124 | const struct lttng_basic_type *elem_type; | |
2125 | const struct lttng_basic_type *length_type; | |
2126 | ||
2127 | elem_type = &field->type.u.sequence.elem_type; | |
2128 | length_type = &field->type.u.sequence.length_type; | |
f513b2bf MD |
2129 | ret = print_tabs(session, nesting); |
2130 | if (ret) | |
2131 | return ret; | |
8070f5c0 | 2132 | ret = lttng_metadata_printf(session, |
f513b2bf | 2133 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", |
8070f5c0 | 2134 | length_type->u.basic.integer.size, |
32257272 | 2135 | (unsigned int) length_type->u.basic.integer.alignment, |
8070f5c0 MD |
2136 | length_type->u.basic.integer.signedness, |
2137 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
2138 | ? "none" | |
0635cdd4 | 2139 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2140 | ? "UTF8" |
0635cdd4 | 2141 | : "ASCII"), |
8070f5c0 | 2142 | length_type->u.basic.integer.base, |
5214fa50 | 2143 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2144 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
e0a7a7c4 | 2145 | #else |
0635cdd4 | 2146 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
e0a7a7c4 | 2147 | #endif |
27d2368e MD |
2148 | field->name); |
2149 | if (ret) | |
2150 | return ret; | |
2151 | ||
43803cf2 | 2152 | if (field->type.u.sequence.elem_alignment) { |
f513b2bf MD |
2153 | ret = print_tabs(session, nesting); |
2154 | if (ret) | |
2155 | return ret; | |
43803cf2 | 2156 | ret = lttng_metadata_printf(session, |
f513b2bf | 2157 | "struct { } align(%u) _%s_padding;\n", |
43803cf2 MD |
2158 | field->type.u.sequence.elem_alignment * CHAR_BIT, |
2159 | field->name); | |
2160 | if (ret) | |
2161 | return ret; | |
2162 | } | |
f513b2bf MD |
2163 | ret = print_tabs(session, nesting); |
2164 | if (ret) | |
2165 | return ret; | |
27d2368e | 2166 | ret = lttng_metadata_printf(session, |
f513b2bf | 2167 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8070f5c0 | 2168 | elem_type->u.basic.integer.size, |
32257272 | 2169 | (unsigned int) elem_type->u.basic.integer.alignment, |
8070f5c0 MD |
2170 | elem_type->u.basic.integer.signedness, |
2171 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
2172 | ? "none" | |
0635cdd4 | 2173 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) |
8070f5c0 | 2174 | ? "UTF8" |
0635cdd4 | 2175 | : "ASCII"), |
8070f5c0 | 2176 | elem_type->u.basic.integer.base, |
5214fa50 | 2177 | #if __BYTE_ORDER == __BIG_ENDIAN |
8070f5c0 | 2178 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
8fa75f34 | 2179 | #else |
8070f5c0 | 2180 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", |
8fa75f34 | 2181 | #endif |
8070f5c0 | 2182 | field->name, |
27d2368e | 2183 | field->name); |
8070f5c0 MD |
2184 | break; |
2185 | } | |
c099397a | 2186 | |
8070f5c0 MD |
2187 | case atype_string: |
2188 | /* Default encoding is UTF8 */ | |
f513b2bf MD |
2189 | ret = print_tabs(session, nesting); |
2190 | if (ret) | |
2191 | return ret; | |
8070f5c0 | 2192 | ret = lttng_metadata_printf(session, |
f513b2bf | 2193 | "string%s _%s;\n", |
8070f5c0 MD |
2194 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
2195 | " { encoding = ASCII; }" : "", | |
2196 | field->name); | |
2197 | break; | |
f513b2bf MD |
2198 | case atype_struct: |
2199 | ret = _lttng_struct_statedump(session, field, nesting); | |
2200 | break; | |
2201 | case atype_array_compound: | |
2202 | ret = _lttng_array_compound_statedump(session, field, nesting); | |
2203 | break; | |
2204 | case atype_sequence_compound: | |
2205 | ret = _lttng_sequence_compound_statedump(session, field, nesting); | |
2206 | break; | |
65c85aa6 MD |
2207 | case atype_variant: |
2208 | ret = _lttng_variant_statedump(session, field, nesting); | |
2209 | break; | |
f513b2bf | 2210 | |
8070f5c0 MD |
2211 | default: |
2212 | WARN_ON_ONCE(1); | |
2213 | return -EINVAL; | |
2214 | } | |
2215 | return ret; | |
2216 | } | |
2217 | ||
2218 | static | |
a90917c3 | 2219 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2220 | struct lttng_ctx *ctx) |
2221 | { | |
2222 | int ret = 0; | |
2223 | int i; | |
2224 | ||
2225 | if (!ctx) | |
2226 | return 0; | |
2227 | for (i = 0; i < ctx->nr_fields; i++) { | |
2228 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2229 | ||
f513b2bf | 2230 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2231 | if (ret) |
2232 | return ret; | |
2233 | } | |
2234 | return ret; | |
2235 | } | |
2236 | ||
2237 | static | |
a90917c3 MD |
2238 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2239 | struct lttng_event *event) | |
8070f5c0 MD |
2240 | { |
2241 | const struct lttng_event_desc *desc = event->desc; | |
2242 | int ret = 0; | |
2243 | int i; | |
2244 | ||
2245 | for (i = 0; i < desc->nr_fields; i++) { | |
2246 | const struct lttng_event_field *field = &desc->fields[i]; | |
2247 | ||
f513b2bf | 2248 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2249 | if (ret) |
2250 | return ret; | |
c099397a MD |
2251 | } |
2252 | return ret; | |
2253 | } | |
2254 | ||
d83004aa JD |
2255 | /* |
2256 | * Must be called with sessions_mutex held. | |
2257 | */ | |
c099397a | 2258 | static |
a90917c3 MD |
2259 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2260 | struct lttng_channel *chan, | |
2261 | struct lttng_event *event) | |
c099397a MD |
2262 | { |
2263 | int ret = 0; | |
2264 | ||
a8f2d0c7 | 2265 | if (event->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2266 | return 0; |
d83004aa | 2267 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2268 | return 0; |
2269 | ||
2270 | ret = lttng_metadata_printf(session, | |
2271 | "event {\n" | |
ae734547 | 2272 | " name = \"%s\";\n" |
c099397a | 2273 | " id = %u;\n" |
b9074a1b | 2274 | " stream_id = %u;\n", |
c099397a MD |
2275 | event->desc->name, |
2276 | event->id, | |
2277 | event->chan->id); | |
2278 | if (ret) | |
2279 | goto end; | |
2280 | ||
b9074a1b MD |
2281 | if (event->ctx) { |
2282 | ret = lttng_metadata_printf(session, | |
2283 | " context := struct {\n"); | |
2284 | if (ret) | |
2285 | goto end; | |
2286 | } | |
a90917c3 | 2287 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2288 | if (ret) |
2289 | goto end; | |
b9074a1b MD |
2290 | if (event->ctx) { |
2291 | ret = lttng_metadata_printf(session, | |
2292 | " };\n"); | |
2293 | if (ret) | |
2294 | goto end; | |
2295 | } | |
8070f5c0 MD |
2296 | |
2297 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2298 | " fields := struct {\n" |
2299 | ); | |
2300 | if (ret) | |
2301 | goto end; | |
2302 | ||
a90917c3 | 2303 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2304 | if (ret) |
2305 | goto end; | |
2306 | ||
2307 | /* | |
2308 | * LTTng space reservation can only reserve multiples of the | |
2309 | * byte size. | |
2310 | */ | |
2311 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2312 | " };\n" |
2313 | "};\n\n"); | |
c099397a MD |
2314 | if (ret) |
2315 | goto end; | |
2316 | ||
c099397a MD |
2317 | event->metadata_dumped = 1; |
2318 | end: | |
2319 | return ret; | |
2320 | ||
2321 | } | |
2322 | ||
d83004aa JD |
2323 | /* |
2324 | * Must be called with sessions_mutex held. | |
2325 | */ | |
c099397a | 2326 | static |
a90917c3 MD |
2327 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2328 | struct lttng_channel *chan) | |
c099397a MD |
2329 | { |
2330 | int ret = 0; | |
2331 | ||
a8f2d0c7 | 2332 | if (chan->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2333 | return 0; |
d83004aa JD |
2334 | |
2335 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2336 | return 0; |
2337 | ||
2338 | WARN_ON_ONCE(!chan->header_type); | |
2339 | ret = lttng_metadata_printf(session, | |
2340 | "stream {\n" | |
2341 | " id = %u;\n" | |
9115fbdc | 2342 | " event.header := %s;\n" |
b9074a1b | 2343 | " packet.context := struct packet_context;\n", |
c099397a MD |
2344 | chan->id, |
2345 | chan->header_type == 1 ? "struct event_header_compact" : | |
2346 | "struct event_header_large"); | |
2347 | if (ret) | |
2348 | goto end; | |
2349 | ||
b9074a1b MD |
2350 | if (chan->ctx) { |
2351 | ret = lttng_metadata_printf(session, | |
2352 | " event.context := struct {\n"); | |
2353 | if (ret) | |
2354 | goto end; | |
2355 | } | |
a90917c3 | 2356 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2357 | if (ret) |
2358 | goto end; | |
b9074a1b MD |
2359 | if (chan->ctx) { |
2360 | ret = lttng_metadata_printf(session, | |
2361 | " };\n"); | |
2362 | if (ret) | |
2363 | goto end; | |
2364 | } | |
8070f5c0 MD |
2365 | |
2366 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2367 | "};\n\n"); |
8070f5c0 | 2368 | |
c099397a MD |
2369 | chan->metadata_dumped = 1; |
2370 | end: | |
2371 | return ret; | |
2372 | } | |
2373 | ||
d83004aa JD |
2374 | /* |
2375 | * Must be called with sessions_mutex held. | |
2376 | */ | |
9115fbdc | 2377 | static |
a90917c3 | 2378 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2379 | { |
2380 | return lttng_metadata_printf(session, | |
2381 | "struct packet_context {\n" | |
a3ccff4f MD |
2382 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2383 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2384 | " uint64_t content_size;\n" |
2385 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2386 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2387 | " unsigned long events_discarded;\n" |
9115fbdc | 2388 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2389 | "};\n\n" |
9115fbdc MD |
2390 | ); |
2391 | } | |
2392 | ||
2393 | /* | |
2394 | * Compact header: | |
2395 | * id: range: 0 - 30. | |
2396 | * id 31 is reserved to indicate an extended header. | |
2397 | * | |
2398 | * Large header: | |
2399 | * id: range: 0 - 65534. | |
2400 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2401 | * |
2402 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2403 | */ |
2404 | static | |
a90917c3 | 2405 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2406 | { |
2407 | return lttng_metadata_printf(session, | |
2408 | "struct event_header_compact {\n" | |
2409 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2410 | " variant <id> {\n" | |
2411 | " struct {\n" | |
a3ccff4f | 2412 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2413 | " } compact;\n" |
2414 | " struct {\n" | |
2415 | " uint32_t id;\n" | |
a3ccff4f | 2416 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2417 | " } extended;\n" |
2418 | " } v;\n" | |
2419 | "} align(%u);\n" | |
2420 | "\n" | |
2421 | "struct event_header_large {\n" | |
2422 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2423 | " variant <id> {\n" | |
2424 | " struct {\n" | |
a3ccff4f | 2425 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2426 | " } compact;\n" |
2427 | " struct {\n" | |
2428 | " uint32_t id;\n" | |
a3ccff4f | 2429 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2430 | " } extended;\n" |
2431 | " } v;\n" | |
2432 | "} align(%u);\n\n", | |
a90917c3 MD |
2433 | lttng_alignof(uint32_t) * CHAR_BIT, |
2434 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2435 | ); |
2436 | } | |
2437 | ||
a3ccff4f MD |
2438 | /* |
2439 | * Approximation of NTP time of day to clock monotonic correlation, | |
2440 | * taken at start of trace. | |
2441 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2442 | * in future versions. | |
5283350b MD |
2443 | * This function may return a negative offset. It may happen if the |
2444 | * system sets the REALTIME clock to 0 after boot. | |
a3ccff4f MD |
2445 | */ |
2446 | static | |
8967b2a3 | 2447 | int64_t measure_clock_offset(void) |
a3ccff4f | 2448 | { |
dcb93448 | 2449 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2450 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2451 | int64_t offset; |
a3ccff4f MD |
2452 | struct timespec rts = { 0, 0 }; |
2453 | unsigned long flags; | |
2454 | ||
2455 | /* Disable interrupts to increase correlation precision. */ | |
2456 | local_irq_save(flags); | |
2457 | monotonic[0] = trace_clock_read64(); | |
216b6baa | 2458 | getnstimeofday(&rts); |
a3ccff4f MD |
2459 | monotonic[1] = trace_clock_read64(); |
2460 | local_irq_restore(flags); | |
2461 | ||
dcb93448 | 2462 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2463 | realtime = (uint64_t) rts.tv_sec * tcf; |
2464 | if (tcf == NSEC_PER_SEC) { | |
2465 | realtime += rts.tv_nsec; | |
2466 | } else { | |
2467 | uint64_t n = rts.tv_nsec * tcf; | |
2468 | ||
2469 | do_div(n, NSEC_PER_SEC); | |
2470 | realtime += n; | |
2471 | } | |
dcb93448 | 2472 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2473 | return offset; |
2474 | } | |
2475 | ||
c099397a MD |
2476 | /* |
2477 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2478 | * Must be called with sessions_mutex held. |
c099397a MD |
2479 | */ |
2480 | static | |
a90917c3 | 2481 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2482 | { |
30bdb6e4 | 2483 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2484 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
a90917c3 MD |
2485 | struct lttng_channel *chan; |
2486 | struct lttng_event *event; | |
c099397a MD |
2487 | int ret = 0; |
2488 | ||
a8f2d0c7 | 2489 | if (!READ_ONCE(session->active)) |
c099397a MD |
2490 | return 0; |
2491 | if (session->metadata_dumped) | |
2492 | goto skip_session; | |
c099397a | 2493 | |
d793d5e1 | 2494 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2495 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2496 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2497 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2498 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2499 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2500 | |
2501 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2502 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2503 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2504 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2505 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2506 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2507 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2508 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2509 | "\n" |
2510 | "trace {\n" | |
2511 | " major = %u;\n" | |
2512 | " minor = %u;\n" | |
30bdb6e4 | 2513 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2514 | " byte_order = %s;\n" |
2515 | " packet.header := struct {\n" | |
2516 | " uint32_t magic;\n" | |
1ec3f75a | 2517 | " uint8_t uuid[16];\n" |
d793d5e1 | 2518 | " uint32_t stream_id;\n" |
5594698f | 2519 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2520 | " };\n" |
d793d5e1 | 2521 | "};\n\n", |
a90917c3 MD |
2522 | lttng_alignof(uint8_t) * CHAR_BIT, |
2523 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2524 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2525 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2526 | sizeof(unsigned long) * CHAR_BIT, |
2527 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2528 | CTF_SPEC_MAJOR, |
2529 | CTF_SPEC_MINOR, | |
d793d5e1 | 2530 | uuid_s, |
5214fa50 | 2531 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2532 | "be" |
2533 | #else | |
2534 | "le" | |
2535 | #endif | |
2536 | ); | |
2537 | if (ret) | |
2538 | goto end; | |
2539 | ||
99dc9597 MD |
2540 | ret = lttng_metadata_printf(session, |
2541 | "env {\n" | |
a6058143 | 2542 | " hostname = \"%s\";\n" |
c6c9e10f | 2543 | " domain = \"kernel\";\n" |
99dc9597 | 2544 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2545 | " kernel_release = \"%s\";\n" |
2546 | " kernel_version = \"%s\";\n" | |
2547 | " tracer_name = \"lttng-modules\";\n" | |
2548 | " tracer_major = %d;\n" | |
2549 | " tracer_minor = %d;\n" | |
2550 | " tracer_patchlevel = %d;\n" | |
99dc9597 | 2551 | "};\n\n", |
3d0d43db | 2552 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2553 | utsname()->sysname, |
2554 | utsname()->release, | |
c6c9e10f MD |
2555 | utsname()->version, |
2556 | LTTNG_MODULES_MAJOR_VERSION, | |
2557 | LTTNG_MODULES_MINOR_VERSION, | |
2558 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2559 | ); |
2560 | if (ret) | |
2561 | goto end; | |
2562 | ||
a3ccff4f MD |
2563 | ret = lttng_metadata_printf(session, |
2564 | "clock {\n" | |
2754583e MD |
2565 | " name = \"%s\";\n", |
2566 | trace_clock_name() | |
a82c63f1 MD |
2567 | ); |
2568 | if (ret) | |
2569 | goto end; | |
2570 | ||
2571 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2572 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2573 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2574 | clock_uuid_s |
2575 | ); | |
2576 | if (ret) | |
2577 | goto end; | |
2578 | } | |
2579 | ||
2580 | ret = lttng_metadata_printf(session, | |
2754583e | 2581 | " description = \"%s\";\n" |
a3ccff4f MD |
2582 | " freq = %llu; /* Frequency, in Hz */\n" |
2583 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2584 | " offset = %lld;\n" |
a3ccff4f | 2585 | "};\n\n", |
2754583e | 2586 | trace_clock_description(), |
a3ccff4f | 2587 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2588 | (long long) measure_clock_offset() |
a3ccff4f MD |
2589 | ); |
2590 | if (ret) | |
2591 | goto end; | |
2592 | ||
2593 | ret = lttng_metadata_printf(session, | |
2594 | "typealias integer {\n" | |
2595 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2596 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2597 | "} := uint27_clock_monotonic_t;\n" |
2598 | "\n" | |
2599 | "typealias integer {\n" | |
2600 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2601 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2602 | "} := uint32_clock_monotonic_t;\n" |
2603 | "\n" | |
2604 | "typealias integer {\n" | |
2605 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2606 | " map = clock.%s.value;\n" |
a3ccff4f | 2607 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2608 | trace_clock_name(), |
a3ccff4f | 2609 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2610 | trace_clock_name(), |
2611 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2612 | trace_clock_name() | |
a3ccff4f MD |
2613 | ); |
2614 | if (ret) | |
2615 | goto end; | |
2616 | ||
a90917c3 | 2617 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2618 | if (ret) |
2619 | goto end; | |
2620 | ||
a90917c3 | 2621 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2622 | if (ret) |
2623 | goto end; | |
2624 | ||
c099397a MD |
2625 | skip_session: |
2626 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2627 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2628 | if (ret) |
2629 | goto end; | |
2630 | } | |
2631 | ||
2632 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2633 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2634 | if (ret) |
2635 | goto end; | |
2636 | } | |
2637 | session->metadata_dumped = 1; | |
2638 | end: | |
2639 | return ret; | |
2640 | } | |
2641 | ||
c0e31d2e | 2642 | /** |
a90917c3 | 2643 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2644 | * @transport: transport structure |
2645 | * | |
2646 | * Registers a transport which can be used as output to extract the data out of | |
2647 | * LTTng. The module calling this registration function must ensure that no | |
2648 | * trap-inducing code will be executed by the transport functions. E.g. | |
2649 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
2650 | * is made visible to the transport function. This registration acts as a | |
2651 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
2652 | * after its registration must it synchronize the TLBs. | |
2653 | */ | |
a90917c3 | 2654 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2655 | { |
2656 | /* | |
2657 | * Make sure no page fault can be triggered by the module about to be | |
2658 | * registered. We deal with this here so we don't have to call | |
2659 | * vmalloc_sync_all() in each module's init. | |
2660 | */ | |
6d2a620c | 2661 | wrapper_vmalloc_sync_all(); |
c0e31d2e MD |
2662 | |
2663 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2664 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2665 | mutex_unlock(&sessions_mutex); |
2666 | } | |
a90917c3 | 2667 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2668 | |
2669 | /** | |
a90917c3 | 2670 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2671 | * @transport: transport structure |
2672 | */ | |
a90917c3 | 2673 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2674 | { |
2675 | mutex_lock(&sessions_mutex); | |
2676 | list_del(&transport->node); | |
2677 | mutex_unlock(&sessions_mutex); | |
2678 | } | |
a90917c3 | 2679 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2680 | |
894ce5dc | 2681 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2682 | |
2683 | enum cpuhp_state lttng_hp_prepare; | |
2684 | enum cpuhp_state lttng_hp_online; | |
2685 | ||
2686 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2687 | { | |
2688 | struct lttng_cpuhp_node *lttng_node; | |
2689 | ||
2690 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2691 | switch (lttng_node->component) { | |
2692 | case LTTNG_RING_BUFFER_FRONTEND: | |
2693 | return 0; | |
2694 | case LTTNG_RING_BUFFER_BACKEND: | |
2695 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2696 | case LTTNG_RING_BUFFER_ITER: | |
2697 | return 0; | |
2698 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2699 | return 0; | |
2700 | default: | |
2701 | return -EINVAL; | |
2702 | } | |
2703 | } | |
2704 | ||
2705 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2706 | { | |
2707 | struct lttng_cpuhp_node *lttng_node; | |
2708 | ||
2709 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2710 | switch (lttng_node->component) { | |
2711 | case LTTNG_RING_BUFFER_FRONTEND: | |
2712 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2713 | case LTTNG_RING_BUFFER_BACKEND: | |
2714 | return 0; | |
2715 | case LTTNG_RING_BUFFER_ITER: | |
2716 | return 0; | |
2717 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2718 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2719 | default: | |
2720 | return -EINVAL; | |
2721 | } | |
2722 | } | |
2723 | ||
2724 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2725 | { | |
2726 | struct lttng_cpuhp_node *lttng_node; | |
2727 | ||
2728 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2729 | switch (lttng_node->component) { | |
2730 | case LTTNG_RING_BUFFER_FRONTEND: | |
2731 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2732 | case LTTNG_RING_BUFFER_BACKEND: | |
2733 | return 0; | |
2734 | case LTTNG_RING_BUFFER_ITER: | |
2735 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2736 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2737 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2738 | default: | |
2739 | return -EINVAL; | |
2740 | } | |
2741 | } | |
2742 | ||
2743 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2744 | { | |
2745 | struct lttng_cpuhp_node *lttng_node; | |
2746 | ||
2747 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2748 | switch (lttng_node->component) { | |
2749 | case LTTNG_RING_BUFFER_FRONTEND: | |
2750 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2751 | case LTTNG_RING_BUFFER_BACKEND: | |
2752 | return 0; | |
2753 | case LTTNG_RING_BUFFER_ITER: | |
2754 | return 0; | |
2755 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2756 | return 0; | |
2757 | default: | |
2758 | return -EINVAL; | |
2759 | } | |
2760 | } | |
2761 | ||
2762 | static int __init lttng_init_cpu_hotplug(void) | |
2763 | { | |
2764 | int ret; | |
2765 | ||
2766 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2767 | lttng_hotplug_prepare, | |
2768 | lttng_hotplug_dead); | |
2769 | if (ret < 0) { | |
2770 | return ret; | |
2771 | } | |
2772 | lttng_hp_prepare = ret; | |
2773 | lttng_rb_set_hp_prepare(ret); | |
2774 | ||
2775 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2776 | lttng_hotplug_online, | |
2777 | lttng_hotplug_offline); | |
2778 | if (ret < 0) { | |
2779 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2780 | lttng_hp_prepare = 0; | |
2781 | return ret; | |
2782 | } | |
2783 | lttng_hp_online = ret; | |
2784 | lttng_rb_set_hp_online(ret); | |
2785 | ||
2786 | return 0; | |
2787 | } | |
2788 | ||
2789 | static void __exit lttng_exit_cpu_hotplug(void) | |
2790 | { | |
2791 | lttng_rb_set_hp_online(0); | |
2792 | cpuhp_remove_multi_state(lttng_hp_online); | |
2793 | lttng_rb_set_hp_prepare(0); | |
2794 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2795 | } | |
2796 | ||
1ee63d8d | 2797 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2798 | static int lttng_init_cpu_hotplug(void) |
2799 | { | |
2800 | return 0; | |
2801 | } | |
2802 | static void lttng_exit_cpu_hotplug(void) | |
2803 | { | |
2804 | } | |
1ee63d8d | 2805 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2806 | |
2807 | ||
a90917c3 | 2808 | static int __init lttng_events_init(void) |
4e3c1b9b | 2809 | { |
1c25284c MD |
2810 | int ret; |
2811 | ||
453b2495 JD |
2812 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
2813 | if (ret) | |
2814 | return ret; | |
389d7070 | 2815 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
2816 | if (ret) |
2817 | return ret; | |
2818 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
2819 | if (ret) |
2820 | return ret; | |
2821 | ret = lttng_probes_init(); | |
389d7070 MD |
2822 | if (ret) |
2823 | return ret; | |
07dfc1d0 | 2824 | ret = lttng_context_init(); |
20591cf7 MD |
2825 | if (ret) |
2826 | return ret; | |
07dfc1d0 MD |
2827 | ret = lttng_tracepoint_init(); |
2828 | if (ret) | |
2829 | goto error_tp; | |
a90917c3 | 2830 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2831 | if (!event_cache) { |
2832 | ret = -ENOMEM; | |
2833 | goto error_kmem; | |
2834 | } | |
80996790 | 2835 | ret = lttng_abi_init(); |
02119ee5 MD |
2836 | if (ret) |
2837 | goto error_abi; | |
0c956676 MD |
2838 | ret = lttng_logger_init(); |
2839 | if (ret) | |
2840 | goto error_logger; | |
1e367326 MD |
2841 | ret = lttng_init_cpu_hotplug(); |
2842 | if (ret) | |
2843 | goto error_hotplug; | |
101215b7 | 2844 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2845 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2846 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2847 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2848 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2849 | LTTNG_VERSION_NAME, |
2850 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2851 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2852 | #else | |
2853 | "", | |
2854 | #endif | |
2855 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2856 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2857 | #else | |
2858 | ""); | |
2859 | #endif | |
4e3c1b9b | 2860 | return 0; |
0c956676 | 2861 | |
1e367326 MD |
2862 | error_hotplug: |
2863 | lttng_logger_exit(); | |
0c956676 MD |
2864 | error_logger: |
2865 | lttng_abi_exit(); | |
02119ee5 | 2866 | error_abi: |
1c25284c | 2867 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2868 | error_kmem: |
2869 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2870 | error_tp: |
2871 | lttng_context_exit(); | |
101215b7 | 2872 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2873 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2874 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2875 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2876 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2877 | LTTNG_VERSION_NAME, |
2878 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2879 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2880 | #else | |
2881 | "", | |
2882 | #endif | |
2883 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2884 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2885 | #else | |
2886 | ""); | |
2887 | #endif | |
1c25284c | 2888 | return ret; |
4e3c1b9b MD |
2889 | } |
2890 | ||
a90917c3 | 2891 | module_init(lttng_events_init); |
11b5a3c2 | 2892 | |
a90917c3 | 2893 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2894 | { |
a90917c3 | 2895 | struct lttng_session *session, *tmpsession; |
92e94819 | 2896 | |
1e367326 | 2897 | lttng_exit_cpu_hotplug(); |
0c956676 | 2898 | lttng_logger_exit(); |
80996790 | 2899 | lttng_abi_exit(); |
92e94819 | 2900 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2901 | lttng_session_destroy(session); |
11b5a3c2 | 2902 | kmem_cache_destroy(event_cache); |
20591cf7 | 2903 | lttng_tracepoint_exit(); |
07dfc1d0 | 2904 | lttng_context_exit(); |
101215b7 | 2905 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2906 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2907 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2908 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2909 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2910 | LTTNG_VERSION_NAME, |
2911 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2912 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2913 | #else | |
2914 | "", | |
2915 | #endif | |
2916 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2917 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2918 | #else | |
2919 | ""); | |
2920 | #endif | |
4e3c1b9b | 2921 | } |
92e94819 | 2922 | |
a90917c3 | 2923 | module_exit(lttng_events_exit); |
11b5a3c2 | 2924 | |
101215b7 MJ |
2925 | #include "extra_version/patches.i" |
2926 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2927 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
2928 | #endif | |
2929 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2930 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
2931 | #endif | |
92e94819 MD |
2932 | MODULE_LICENSE("GPL and additional rights"); |
2933 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 2934 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
2935 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
2936 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
2937 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
2938 | LTTNG_MODULES_EXTRAVERSION); |