Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 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> |
c88f762e | 30 | #include <linux/dmi.h> |
3c997079 | 31 | |
a7008254 | 32 | #include <wrapper/uuid.h> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
34 | #include <wrapper/random.h> |
35 | #include <wrapper/tracepoint.h> | |
36 | #include <wrapper/list.h> | |
cbc19040 | 37 | #include <wrapper/types.h> |
2df37e95 MD |
38 | #include <lttng/kernel-version.h> |
39 | #include <lttng/events.h> | |
40 | #include <lttng/tracer.h> | |
41 | #include <lttng/abi-old.h> | |
42 | #include <lttng/endian.h> | |
43 | #include <lttng/string-utils.h> | |
24591303 MD |
44 | #include <ringbuffer/backend.h> |
45 | #include <ringbuffer/frontend.h> | |
3636085f | 46 | #include <wrapper/time.h> |
4e3c1b9b | 47 | |
d83004aa JD |
48 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
49 | ||
4e3c1b9b | 50 | static LIST_HEAD(sessions); |
a90917c3 | 51 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
52 | /* |
53 | * Protect the sessions and metadata caches. | |
54 | */ | |
4e3c1b9b MD |
55 | static DEFINE_MUTEX(sessions_mutex); |
56 | static struct kmem_cache *event_cache; | |
57 | ||
b2bc0bc8 FD |
58 | static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
59 | static void lttng_session_sync_event_enablers(struct lttng_session *session); | |
60 | static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler); | |
3c997079 | 61 | |
a90917c3 MD |
62 | static void _lttng_event_destroy(struct lttng_event *event); |
63 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
64 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 65 | static |
a90917c3 MD |
66 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
67 | struct lttng_channel *chan, | |
68 | struct lttng_event *event); | |
c099397a | 69 | static |
a90917c3 | 70 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
71 | static |
72 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 73 | static |
ceabb767 MD |
74 | int _lttng_type_statedump(struct lttng_session *session, |
75 | const struct lttng_type *type, | |
76 | size_t nesting); | |
77 | static | |
f513b2bf MD |
78 | int _lttng_field_statedump(struct lttng_session *session, |
79 | const struct lttng_event_field *field, | |
80 | size_t nesting); | |
c099397a | 81 | |
c099397a | 82 | void synchronize_trace(void) |
abcca994 | 83 | { |
92da05ce MJ |
84 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
85 | synchronize_rcu(); | |
86 | #else | |
abcca994 | 87 | synchronize_sched(); |
92da05ce MJ |
88 | #endif |
89 | ||
b8590f40 MD |
90 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
91 | #ifdef CONFIG_PREEMPT_RT_FULL | |
92 | synchronize_rcu(); | |
93 | #endif | |
94 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
95 | #ifdef CONFIG_PREEMPT_RT |
96 | synchronize_rcu(); | |
97 | #endif | |
b8590f40 | 98 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
99 | } |
100 | ||
3c997079 MD |
101 | void lttng_lock_sessions(void) |
102 | { | |
103 | mutex_lock(&sessions_mutex); | |
104 | } | |
105 | ||
106 | void lttng_unlock_sessions(void) | |
107 | { | |
108 | mutex_unlock(&sessions_mutex); | |
109 | } | |
110 | ||
111 | /* | |
112 | * Called with sessions lock held. | |
113 | */ | |
114 | int lttng_session_active(void) | |
115 | { | |
116 | struct lttng_session *iter; | |
117 | ||
118 | list_for_each_entry(iter, &sessions, list) { | |
119 | if (iter->active) | |
120 | return 1; | |
121 | } | |
122 | return 0; | |
123 | } | |
124 | ||
a90917c3 | 125 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 126 | { |
a90917c3 | 127 | struct lttng_session *session; |
d83004aa | 128 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 129 | int i; |
4e3c1b9b MD |
130 | |
131 | mutex_lock(&sessions_mutex); | |
48f5e0b5 | 132 | session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL); |
4e3c1b9b | 133 | if (!session) |
d83004aa | 134 | goto err; |
4e3c1b9b | 135 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 136 | INIT_LIST_HEAD(&session->events); |
a7008254 | 137 | lttng_guid_gen(&session->uuid); |
d83004aa JD |
138 | |
139 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
140 | GFP_KERNEL); | |
141 | if (!metadata_cache) | |
142 | goto err_free_session; | |
0ca42eb7 | 143 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
144 | if (!metadata_cache->data) |
145 | goto err_free_cache; | |
146 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
147 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 148 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
149 | session->metadata_cache = metadata_cache; |
150 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
151 | memcpy(&metadata_cache->uuid, &session->uuid, |
152 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
153 | INIT_LIST_HEAD(&session->enablers_head); |
154 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
155 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 156 | list_add(&session->list, &sessions); |
d1f652f8 MD |
157 | session->pid_tracker.session = session; |
158 | session->pid_tracker.tracker_type = TRACKER_PID; | |
159 | session->vpid_tracker.session = session; | |
160 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
161 | session->uid_tracker.session = session; | |
162 | session->uid_tracker.tracker_type = TRACKER_UID; | |
163 | session->vuid_tracker.session = session; | |
164 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
165 | session->gid_tracker.session = session; | |
166 | session->gid_tracker.tracker_type = TRACKER_GID; | |
167 | session->vgid_tracker.session = session; | |
168 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
169 | mutex_unlock(&sessions_mutex); |
170 | return session; | |
d83004aa JD |
171 | |
172 | err_free_cache: | |
173 | kfree(metadata_cache); | |
174 | err_free_session: | |
48f5e0b5 | 175 | lttng_kvfree(session); |
d83004aa JD |
176 | err: |
177 | mutex_unlock(&sessions_mutex); | |
178 | return NULL; | |
179 | } | |
180 | ||
181 | void metadata_cache_destroy(struct kref *kref) | |
182 | { | |
183 | struct lttng_metadata_cache *cache = | |
184 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 185 | vfree(cache->data); |
d83004aa | 186 | kfree(cache); |
4e3c1b9b MD |
187 | } |
188 | ||
a90917c3 | 189 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 190 | { |
a90917c3 MD |
191 | struct lttng_channel *chan, *tmpchan; |
192 | struct lttng_event *event, *tmpevent; | |
d83004aa | 193 | struct lttng_metadata_stream *metadata_stream; |
b2bc0bc8 | 194 | struct lttng_event_enabler *event_enabler, *tmp_event_enabler; |
dda6a249 | 195 | int ret; |
4e3c1b9b MD |
196 | |
197 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 198 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
199 | list_for_each_entry(chan, &session->chan, list) { |
200 | ret = lttng_syscalls_unregister(chan); | |
201 | WARN_ON(ret); | |
202 | } | |
dda6a249 | 203 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 204 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
205 | WARN_ON(ret); |
206 | } | |
abcca994 | 207 | synchronize_trace(); /* Wait for in-flight events to complete */ |
badfe9f5 MD |
208 | list_for_each_entry(chan, &session->chan, list) { |
209 | ret = lttng_syscalls_destroy(chan); | |
210 | WARN_ON(ret); | |
211 | } | |
b2bc0bc8 | 212 | list_for_each_entry_safe(event_enabler, tmp_event_enabler, |
3c997079 | 213 | &session->enablers_head, node) |
b2bc0bc8 | 214 | lttng_event_enabler_destroy(event_enabler); |
4e3c1b9b | 215 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 216 | _lttng_event_destroy(event); |
d83004aa JD |
217 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
218 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 219 | _lttng_channel_destroy(chan); |
d83004aa | 220 | } |
ab036a63 | 221 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
222 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) |
223 | _lttng_metadata_channel_hangup(metadata_stream); | |
ab036a63 | 224 | mutex_unlock(&session->metadata_cache->lock); |
d1f652f8 MD |
225 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
226 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
227 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
228 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
229 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
230 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 231 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
232 | list_del(&session->list); |
233 | mutex_unlock(&sessions_mutex); | |
48f5e0b5 | 234 | lttng_kvfree(session); |
4e3c1b9b MD |
235 | } |
236 | ||
601252cf MD |
237 | int lttng_session_statedump(struct lttng_session *session) |
238 | { | |
239 | int ret; | |
240 | ||
241 | mutex_lock(&sessions_mutex); | |
242 | ret = lttng_statedump_start(session); | |
243 | mutex_unlock(&sessions_mutex); | |
244 | return ret; | |
245 | } | |
246 | ||
a90917c3 | 247 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
248 | { |
249 | int ret = 0; | |
a90917c3 | 250 | struct lttng_channel *chan; |
c0e31d2e MD |
251 | |
252 | mutex_lock(&sessions_mutex); | |
253 | if (session->active) { | |
254 | ret = -EBUSY; | |
255 | goto end; | |
256 | } | |
c099397a | 257 | |
3c997079 MD |
258 | /* Set transient enabler state to "enabled" */ |
259 | session->tstate = 1; | |
260 | ||
4ef81e4a | 261 | /* We need to sync enablers with session before activation. */ |
b2bc0bc8 | 262 | lttng_session_sync_event_enablers(session); |
4ef81e4a | 263 | |
c099397a MD |
264 | /* |
265 | * Snapshot the number of events per channel to know the type of header | |
266 | * we need to use. | |
267 | */ | |
268 | list_for_each_entry(chan, &session->chan, list) { | |
269 | if (chan->header_type) | |
270 | continue; /* don't change it if session stop/restart */ | |
271 | if (chan->free_event_id < 31) | |
272 | chan->header_type = 1; /* compact */ | |
273 | else | |
274 | chan->header_type = 2; /* large */ | |
275 | } | |
276 | ||
64af2437 | 277 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
278 | list_for_each_entry(chan, &session->chan, list) { |
279 | if (chan->channel_type != METADATA_CHANNEL) | |
280 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
281 | } | |
64af2437 | 282 | |
a8f2d0c7 MJ |
283 | WRITE_ONCE(session->active, 1); |
284 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 285 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 286 | if (ret) { |
a8f2d0c7 | 287 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
288 | goto end; |
289 | } | |
290 | ret = lttng_statedump_start(session); | |
360f38ea | 291 | if (ret) |
a8f2d0c7 | 292 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
293 | end: |
294 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 295 | return ret; |
c0e31d2e MD |
296 | } |
297 | ||
a90917c3 | 298 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
299 | { |
300 | int ret = 0; | |
64af2437 | 301 | struct lttng_channel *chan; |
c0e31d2e MD |
302 | |
303 | mutex_lock(&sessions_mutex); | |
304 | if (!session->active) { | |
305 | ret = -EBUSY; | |
306 | goto end; | |
307 | } | |
a8f2d0c7 | 308 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
309 | |
310 | /* Set transient enabler state to "disabled" */ | |
311 | session->tstate = 0; | |
b2bc0bc8 | 312 | lttng_session_sync_event_enablers(session); |
64af2437 MD |
313 | |
314 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
315 | list_for_each_entry(chan, &session->chan, list) { |
316 | if (chan->channel_type != METADATA_CHANNEL) | |
317 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
318 | } | |
c0e31d2e MD |
319 | end: |
320 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 321 | return ret; |
c0e31d2e MD |
322 | } |
323 | ||
9616f0bf JD |
324 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
325 | { | |
326 | int ret = 0; | |
327 | struct lttng_channel *chan; | |
328 | struct lttng_event *event; | |
329 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
330 | struct lttng_metadata_stream *stream; | |
331 | ||
332 | mutex_lock(&sessions_mutex); | |
333 | if (!session->active) { | |
334 | ret = -EBUSY; | |
335 | goto end; | |
336 | } | |
337 | ||
338 | mutex_lock(&cache->lock); | |
339 | memset(cache->data, 0, cache->cache_alloc); | |
340 | cache->metadata_written = 0; | |
341 | cache->version++; | |
342 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
343 | stream->metadata_out = 0; | |
344 | stream->metadata_in = 0; | |
345 | } | |
346 | mutex_unlock(&cache->lock); | |
347 | ||
348 | session->metadata_dumped = 0; | |
349 | list_for_each_entry(chan, &session->chan, list) { | |
350 | chan->metadata_dumped = 0; | |
351 | } | |
352 | ||
353 | list_for_each_entry(event, &session->events, list) { | |
354 | event->metadata_dumped = 0; | |
355 | } | |
356 | ||
357 | ret = _lttng_session_metadata_statedump(session); | |
358 | ||
359 | end: | |
360 | mutex_unlock(&sessions_mutex); | |
361 | return ret; | |
362 | } | |
363 | ||
a90917c3 | 364 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 365 | { |
3c997079 | 366 | int ret = 0; |
e64957da | 367 | |
3c997079 MD |
368 | mutex_lock(&sessions_mutex); |
369 | if (channel->channel_type == METADATA_CHANNEL) { | |
370 | ret = -EPERM; | |
371 | goto end; | |
372 | } | |
373 | if (channel->enabled) { | |
374 | ret = -EEXIST; | |
375 | goto end; | |
376 | } | |
377 | /* Set transient enabler state to "enabled" */ | |
378 | channel->tstate = 1; | |
b2bc0bc8 | 379 | lttng_session_sync_event_enablers(channel->session); |
3c997079 | 380 | /* Set atomically the state to "enabled" */ |
a8f2d0c7 | 381 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
382 | end: |
383 | mutex_unlock(&sessions_mutex); | |
384 | return ret; | |
e64957da MD |
385 | } |
386 | ||
a90917c3 | 387 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 388 | { |
3c997079 | 389 | int ret = 0; |
e64957da | 390 | |
3c997079 MD |
391 | mutex_lock(&sessions_mutex); |
392 | if (channel->channel_type == METADATA_CHANNEL) { | |
393 | ret = -EPERM; | |
394 | goto end; | |
395 | } | |
396 | if (!channel->enabled) { | |
397 | ret = -EEXIST; | |
398 | goto end; | |
399 | } | |
400 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 401 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
402 | /* Set transient enabler state to "enabled" */ |
403 | channel->tstate = 0; | |
b2bc0bc8 | 404 | lttng_session_sync_event_enablers(channel->session); |
3c997079 MD |
405 | end: |
406 | mutex_unlock(&sessions_mutex); | |
407 | return ret; | |
e64957da MD |
408 | } |
409 | ||
a90917c3 | 410 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 411 | { |
3c997079 | 412 | int ret = 0; |
e64957da | 413 | |
3c997079 MD |
414 | mutex_lock(&sessions_mutex); |
415 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
416 | ret = -EPERM; | |
417 | goto end; | |
418 | } | |
419 | if (event->enabled) { | |
420 | ret = -EEXIST; | |
421 | goto end; | |
422 | } | |
a0493bef MD |
423 | switch (event->instrumentation) { |
424 | case LTTNG_KERNEL_TRACEPOINT: | |
425 | case LTTNG_KERNEL_SYSCALL: | |
426 | ret = -EINVAL; | |
427 | break; | |
428 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 429 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 430 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 431 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
432 | break; |
433 | case LTTNG_KERNEL_KRETPROBE: | |
434 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
435 | break; | |
e884017c | 436 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
437 | default: |
438 | WARN_ON_ONCE(1); | |
439 | ret = -EINVAL; | |
440 | } | |
3c997079 MD |
441 | end: |
442 | mutex_unlock(&sessions_mutex); | |
443 | return ret; | |
e64957da MD |
444 | } |
445 | ||
a90917c3 | 446 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 447 | { |
3c997079 | 448 | int ret = 0; |
e64957da | 449 | |
3c997079 MD |
450 | mutex_lock(&sessions_mutex); |
451 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
452 | ret = -EPERM; | |
453 | goto end; | |
454 | } | |
455 | if (!event->enabled) { | |
456 | ret = -EEXIST; | |
457 | goto end; | |
458 | } | |
a0493bef MD |
459 | switch (event->instrumentation) { |
460 | case LTTNG_KERNEL_TRACEPOINT: | |
461 | case LTTNG_KERNEL_SYSCALL: | |
462 | ret = -EINVAL; | |
463 | break; | |
464 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 465 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 466 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 467 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
468 | break; |
469 | case LTTNG_KERNEL_KRETPROBE: | |
470 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
471 | break; | |
e884017c | 472 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
473 | default: |
474 | WARN_ON_ONCE(1); | |
475 | ret = -EINVAL; | |
476 | } | |
3c997079 MD |
477 | end: |
478 | mutex_unlock(&sessions_mutex); | |
479 | return ret; | |
e64957da MD |
480 | } |
481 | ||
a90917c3 | 482 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 483 | { |
a90917c3 | 484 | struct lttng_transport *transport; |
f3d01b96 | 485 | |
a90917c3 | 486 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
487 | if (!strcmp(transport->name, name)) |
488 | return transport; | |
489 | } | |
490 | return NULL; | |
491 | } | |
492 | ||
a90917c3 | 493 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
494 | const char *transport_name, |
495 | void *buf_addr, | |
4e3c1b9b MD |
496 | size_t subbuf_size, size_t num_subbuf, |
497 | unsigned int switch_timer_interval, | |
d83004aa JD |
498 | unsigned int read_timer_interval, |
499 | enum channel_type channel_type) | |
4e3c1b9b | 500 | { |
a90917c3 MD |
501 | struct lttng_channel *chan; |
502 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
503 | |
504 | mutex_lock(&sessions_mutex); | |
d83004aa | 505 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 506 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 507 | transport = lttng_transport_find(transport_name); |
f3d01b96 | 508 | if (!transport) { |
5a15f70c | 509 | printk(KERN_WARNING "LTTng: transport %s not found\n", |
f3d01b96 | 510 | transport_name); |
c0e31d2e | 511 | goto notransport; |
f3d01b96 | 512 | } |
a33c9927 | 513 | if (!try_module_get(transport->owner)) { |
5a15f70c | 514 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
a33c9927 MD |
515 | goto notransport; |
516 | } | |
a90917c3 | 517 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 518 | if (!chan) |
c0e31d2e | 519 | goto nomem; |
4e3c1b9b | 520 | chan->session = session; |
05d32c64 | 521 | chan->id = session->free_chan_id++; |
3b731ab1 | 522 | chan->ops = &transport->ops; |
125b4df4 MD |
523 | /* |
524 | * Note: the channel creation op already writes into the packet | |
525 | * headers. Therefore the "chan" information used as input | |
526 | * should be already accessible. | |
527 | */ | |
5f5ddf01 MD |
528 | chan->chan = transport->ops.channel_create(transport_name, |
529 | chan, buf_addr, subbuf_size, num_subbuf, | |
530 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
531 | if (!chan->chan) |
532 | goto create_error; | |
3c997079 | 533 | chan->tstate = 1; |
e64957da | 534 | chan->enabled = 1; |
a33c9927 | 535 | chan->transport = transport; |
d83004aa | 536 | chan->channel_type = channel_type; |
4e3c1b9b MD |
537 | list_add(&chan->list, &session->chan); |
538 | mutex_unlock(&sessions_mutex); | |
539 | return chan; | |
540 | ||
f3d01b96 MD |
541 | create_error: |
542 | kfree(chan); | |
c0e31d2e | 543 | nomem: |
a33c9927 MD |
544 | if (transport) |
545 | module_put(transport->owner); | |
c0e31d2e | 546 | notransport: |
e5382b6d | 547 | active: |
4e3c1b9b MD |
548 | mutex_unlock(&sessions_mutex); |
549 | return NULL; | |
550 | } | |
551 | ||
552 | /* | |
d83004aa JD |
553 | * Only used internally at session destruction for per-cpu channels, and |
554 | * when metadata channel is released. | |
555 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 556 | */ |
aa7c23a9 | 557 | static |
a90917c3 | 558 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 559 | { |
11b5a3c2 | 560 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 561 | module_put(chan->transport->owner); |
4e3c1b9b | 562 | list_del(&chan->list); |
8070f5c0 | 563 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
564 | kfree(chan); |
565 | } | |
566 | ||
d83004aa JD |
567 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
568 | { | |
569 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
570 | ||
571 | /* Protect the metadata cache with the sessions_mutex. */ | |
572 | mutex_lock(&sessions_mutex); | |
573 | _lttng_channel_destroy(chan); | |
574 | mutex_unlock(&sessions_mutex); | |
575 | } | |
576 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
577 | ||
578 | static | |
579 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
580 | { | |
581 | stream->finalized = 1; | |
582 | wake_up_interruptible(&stream->read_wait); | |
583 | } | |
584 | ||
e5382b6d MD |
585 | /* |
586 | * Supports event creation while tracing session is active. | |
3c997079 | 587 | * Needs to be called with sessions mutex held. |
e5382b6d | 588 | */ |
3c997079 MD |
589 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
590 | struct lttng_kernel_event *event_param, | |
591 | void *filter, | |
592 | const struct lttng_event_desc *event_desc, | |
593 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 594 | { |
3c997079 | 595 | struct lttng_session *session = chan->session; |
a90917c3 | 596 | struct lttng_event *event; |
3c997079 MD |
597 | const char *event_name; |
598 | struct hlist_head *head; | |
599 | size_t name_len; | |
600 | uint32_t hash; | |
3d084699 | 601 | int ret; |
4e3c1b9b | 602 | |
abc0446a | 603 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 604 | ret = -EMFILE; |
e5382b6d | 605 | goto full; |
abc0446a | 606 | } |
3c997079 MD |
607 | |
608 | switch (itype) { | |
609 | case LTTNG_KERNEL_TRACEPOINT: | |
610 | event_name = event_desc->name; | |
611 | break; | |
612 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 613 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 614 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 615 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 616 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
617 | event_name = event_param->name; |
618 | break; | |
e884017c | 619 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
620 | default: |
621 | WARN_ON_ONCE(1); | |
622 | ret = -EINVAL; | |
623 | goto type_error; | |
624 | } | |
625 | name_len = strlen(event_name); | |
626 | hash = jhash(event_name, name_len, 0); | |
627 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 628 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
629 | WARN_ON_ONCE(!event->desc); |
630 | if (!strncmp(event->desc->name, event_name, | |
631 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
632 | && chan == event->chan) { | |
633 | ret = -EEXIST; | |
634 | goto exist; | |
abc0446a MD |
635 | } |
636 | } | |
3c997079 | 637 | |
11b5a3c2 | 638 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 639 | if (!event) { |
4cf0bf51 | 640 | ret = -ENOMEM; |
4e3c1b9b | 641 | goto cache_error; |
abc0446a | 642 | } |
4e3c1b9b MD |
643 | event->chan = chan; |
644 | event->filter = filter; | |
e5382b6d | 645 | event->id = chan->free_event_id++; |
3c997079 MD |
646 | event->instrumentation = itype; |
647 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 648 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
649 | INIT_LIST_HEAD(&event->enablers_ref_head); |
650 | ||
651 | switch (itype) { | |
ab2277d6 | 652 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
653 | /* Event will be enabled by enabler sync. */ |
654 | event->enabled = 0; | |
655 | event->registered = 0; | |
656 | event->desc = lttng_event_get(event_name); | |
abc0446a | 657 | if (!event->desc) { |
4cf0bf51 | 658 | ret = -ENOENT; |
d3dbe23c | 659 | goto register_error; |
abc0446a | 660 | } |
3c997079 MD |
661 | /* Populate lttng_event structure before event registration. */ |
662 | smp_wmb(); | |
baf20995 | 663 | break; |
ab2277d6 | 664 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
665 | /* |
666 | * Needs to be explicitly enabled after creation, since | |
667 | * we may want to apply filters. | |
668 | */ | |
669 | event->enabled = 0; | |
3c997079 MD |
670 | event->registered = 1; |
671 | /* | |
672 | * Populate lttng_event structure before event | |
673 | * registration. | |
674 | */ | |
675 | smp_wmb(); | |
676 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
677 | event_param->u.kprobe.symbol_name, |
678 | event_param->u.kprobe.offset, | |
679 | event_param->u.kprobe.addr, | |
680 | event); | |
abc0446a | 681 | if (ret) { |
4cf0bf51 | 682 | ret = -EINVAL; |
d6d808f3 | 683 | goto register_error; |
abc0446a | 684 | } |
edeb3137 MD |
685 | ret = try_module_get(event->desc->owner); |
686 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 687 | break; |
7371f44c MD |
688 | case LTTNG_KERNEL_KRETPROBE: |
689 | { | |
a90917c3 | 690 | struct lttng_event *event_return; |
7371f44c MD |
691 | |
692 | /* kretprobe defines 2 events */ | |
a0493bef MD |
693 | /* |
694 | * Needs to be explicitly enabled after creation, since | |
695 | * we may want to apply filters. | |
696 | */ | |
697 | event->enabled = 0; | |
3c997079 | 698 | event->registered = 1; |
7371f44c MD |
699 | event_return = |
700 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 701 | if (!event_return) { |
4cf0bf51 | 702 | ret = -ENOMEM; |
7371f44c | 703 | goto register_error; |
abc0446a | 704 | } |
7371f44c MD |
705 | event_return->chan = chan; |
706 | event_return->filter = filter; | |
707 | event_return->id = chan->free_event_id++; | |
a0493bef | 708 | event_return->enabled = 0; |
3c997079 MD |
709 | event_return->registered = 1; |
710 | event_return->instrumentation = itype; | |
7371f44c | 711 | /* |
a90917c3 | 712 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
713 | */ |
714 | smp_wmb(); | |
3c997079 | 715 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
716 | event_param->u.kretprobe.symbol_name, |
717 | event_param->u.kretprobe.offset, | |
718 | event_param->u.kretprobe.addr, | |
719 | event, event_return); | |
720 | if (ret) { | |
721 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 722 | ret = -EINVAL; |
7371f44c MD |
723 | goto register_error; |
724 | } | |
725 | /* Take 2 refs on the module: one per event. */ | |
726 | ret = try_module_get(event->desc->owner); | |
727 | WARN_ON_ONCE(!ret); | |
728 | ret = try_module_get(event->desc->owner); | |
729 | WARN_ON_ONCE(!ret); | |
a90917c3 | 730 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 731 | event_return); |
abc0446a | 732 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
733 | if (ret) { |
734 | kmem_cache_free(event_cache, event_return); | |
735 | module_put(event->desc->owner); | |
736 | module_put(event->desc->owner); | |
737 | goto statedump_error; | |
738 | } | |
739 | list_add(&event_return->list, &chan->session->events); | |
740 | break; | |
741 | } | |
1ec65de1 | 742 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 743 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
744 | /* |
745 | * Needs to be explicitly enabled after creation, since | |
746 | * we may want to apply filters. | |
747 | */ | |
748 | event->enabled = 0; | |
3c997079 MD |
749 | event->registered = 0; |
750 | event->desc = event_desc; | |
badfe9f5 MD |
751 | switch (event_param->u.syscall.entryexit) { |
752 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
753 | ret = -EINVAL; | |
754 | goto register_error; | |
755 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
756 | event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; | |
757 | break; | |
758 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
759 | event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; | |
760 | break; | |
761 | } | |
762 | switch (event_param->u.syscall.abi) { | |
763 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
764 | ret = -EINVAL; | |
765 | goto register_error; | |
766 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
767 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; | |
768 | break; | |
769 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
770 | event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; | |
771 | break; | |
772 | } | |
abc0446a | 773 | if (!event->desc) { |
4cf0bf51 | 774 | ret = -EINVAL; |
259b6cb3 | 775 | goto register_error; |
abc0446a | 776 | } |
1ec65de1 | 777 | break; |
149b9a9d | 778 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
779 | /* |
780 | * Needs to be explicitly enabled after creation, since | |
781 | * we may want to apply filters. | |
782 | */ | |
783 | event->enabled = 0; | |
784 | event->registered = 1; | |
3aed4dca | 785 | |
a344f64b FD |
786 | /* |
787 | * Populate lttng_event structure before event | |
788 | * registration. | |
789 | */ | |
790 | smp_wmb(); | |
149b9a9d YB |
791 | |
792 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 793 | event_param->u.uprobe.fd, |
149b9a9d YB |
794 | event); |
795 | if (ret) | |
796 | goto register_error; | |
797 | ret = try_module_get(event->desc->owner); | |
798 | WARN_ON_ONCE(!ret); | |
799 | break; | |
e884017c | 800 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
801 | default: |
802 | WARN_ON_ONCE(1); | |
4cf0bf51 | 803 | ret = -EINVAL; |
df07930b | 804 | goto register_error; |
baf20995 | 805 | } |
a90917c3 | 806 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
807 | WARN_ON_ONCE(ret > 0); |
808 | if (ret) { | |
c099397a | 809 | goto statedump_error; |
abc0446a | 810 | } |
3c997079 | 811 | hlist_add_head(&event->hlist, head); |
dda6a249 | 812 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
813 | return event; |
814 | ||
c099397a | 815 | statedump_error: |
259b6cb3 | 816 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 817 | register_error: |
11b5a3c2 | 818 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
819 | cache_error: |
820 | exist: | |
3c997079 | 821 | type_error: |
e5382b6d | 822 | full: |
4cf0bf51 | 823 | return ERR_PTR(ret); |
4e3c1b9b MD |
824 | } |
825 | ||
3c997079 MD |
826 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
827 | struct lttng_kernel_event *event_param, | |
828 | void *filter, | |
829 | const struct lttng_event_desc *event_desc, | |
830 | enum lttng_kernel_instrumentation itype) | |
831 | { | |
832 | struct lttng_event *event; | |
833 | ||
834 | mutex_lock(&sessions_mutex); | |
835 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
836 | itype); | |
837 | mutex_unlock(&sessions_mutex); | |
838 | return event; | |
839 | } | |
840 | ||
841 | /* Only used for tracepoints for now. */ | |
842 | static | |
843 | void register_event(struct lttng_event *event) | |
844 | { | |
845 | const struct lttng_event_desc *desc; | |
f127e61e | 846 | int ret = -EINVAL; |
3c997079 | 847 | |
3c997079 MD |
848 | if (event->registered) |
849 | return; | |
4ecb5ad5 | 850 | |
3c997079 | 851 | desc = event->desc; |
4ecb5ad5 MD |
852 | switch (event->instrumentation) { |
853 | case LTTNG_KERNEL_TRACEPOINT: | |
854 | ret = lttng_wrapper_tracepoint_probe_register(desc->kname, | |
855 | desc->probe_callback, | |
856 | event); | |
857 | break; | |
858 | case LTTNG_KERNEL_SYSCALL: | |
badfe9f5 | 859 | ret = lttng_syscall_filter_enable(event->chan, event); |
4ecb5ad5 MD |
860 | break; |
861 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 862 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 863 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
864 | case LTTNG_KERNEL_NOOP: |
865 | ret = 0; | |
866 | break; | |
e884017c | 867 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
868 | default: |
869 | WARN_ON_ONCE(1); | |
870 | } | |
3c997079 MD |
871 | if (!ret) |
872 | event->registered = 1; | |
873 | } | |
874 | ||
4e3c1b9b MD |
875 | /* |
876 | * Only used internally at session destruction. | |
877 | */ | |
a90917c3 | 878 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 879 | { |
4ecb5ad5 | 880 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
881 | int ret = -EINVAL; |
882 | ||
3c997079 MD |
883 | if (!event->registered) |
884 | return 0; | |
885 | ||
4ecb5ad5 | 886 | desc = event->desc; |
38d024ae | 887 | switch (event->instrumentation) { |
ab2277d6 | 888 | case LTTNG_KERNEL_TRACEPOINT: |
20591cf7 | 889 | ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 890 | event->desc->probe_callback, |
11b5a3c2 | 891 | event); |
baf20995 | 892 | break; |
ab2277d6 | 893 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 894 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
895 | ret = 0; |
896 | break; | |
7371f44c MD |
897 | case LTTNG_KERNEL_KRETPROBE: |
898 | lttng_kretprobes_unregister(event); | |
899 | ret = 0; | |
900 | break; | |
33a39a3c | 901 | case LTTNG_KERNEL_SYSCALL: |
badfe9f5 | 902 | ret = lttng_syscall_filter_disable(event->chan, event); |
4ecb5ad5 MD |
903 | break; |
904 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
905 | ret = 0; |
906 | break; | |
149b9a9d YB |
907 | case LTTNG_KERNEL_UPROBE: |
908 | lttng_uprobes_unregister(event); | |
909 | ret = 0; | |
910 | break; | |
e884017c | 911 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
912 | default: |
913 | WARN_ON_ONCE(1); | |
914 | } | |
3c997079 MD |
915 | if (!ret) |
916 | event->registered = 0; | |
dda6a249 MD |
917 | return ret; |
918 | } | |
919 | ||
920 | /* | |
921 | * Only used internally at session destruction. | |
922 | */ | |
be066e6c | 923 | static |
a90917c3 | 924 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 925 | { |
edeb3137 MD |
926 | switch (event->instrumentation) { |
927 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 928 | lttng_event_put(event->desc); |
edeb3137 MD |
929 | break; |
930 | case LTTNG_KERNEL_KPROBE: | |
931 | module_put(event->desc->owner); | |
932 | lttng_kprobes_destroy_private(event); | |
933 | break; | |
7371f44c MD |
934 | case LTTNG_KERNEL_KRETPROBE: |
935 | module_put(event->desc->owner); | |
936 | lttng_kretprobes_destroy_private(event); | |
937 | break; | |
259b6cb3 | 938 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 939 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 940 | break; |
149b9a9d YB |
941 | case LTTNG_KERNEL_UPROBE: |
942 | module_put(event->desc->owner); | |
943 | lttng_uprobes_destroy_private(event); | |
944 | break; | |
e884017c | 945 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
946 | default: |
947 | WARN_ON_ONCE(1); | |
948 | } | |
dda6a249 | 949 | list_del(&event->list); |
8070f5c0 | 950 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 951 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
952 | } |
953 | ||
d1f652f8 MD |
954 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
955 | enum tracker_type tracker_type) | |
e0130fab | 956 | { |
d1f652f8 MD |
957 | switch (tracker_type) { |
958 | case TRACKER_PID: | |
959 | return &session->pid_tracker; | |
960 | case TRACKER_VPID: | |
961 | return &session->vpid_tracker; | |
962 | case TRACKER_UID: | |
963 | return &session->uid_tracker; | |
964 | case TRACKER_VUID: | |
965 | return &session->vuid_tracker; | |
966 | case TRACKER_GID: | |
967 | return &session->gid_tracker; | |
968 | case TRACKER_VGID: | |
969 | return &session->vgid_tracker; | |
970 | default: | |
971 | WARN_ON_ONCE(1); | |
972 | return NULL; | |
973 | } | |
974 | } | |
975 | ||
976 | int lttng_session_track_id(struct lttng_session *session, | |
977 | enum tracker_type tracker_type, int id) | |
978 | { | |
979 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
980 | int ret; |
981 | ||
d1f652f8 MD |
982 | tracker = get_tracker(session, tracker_type); |
983 | if (!tracker) | |
984 | return -EINVAL; | |
985 | if (id < -1) | |
e0130fab MD |
986 | return -EINVAL; |
987 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
988 | if (id == -1) { |
989 | /* track all ids: destroy tracker. */ | |
990 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
991 | ret = 0; |
992 | } else { | |
d1f652f8 | 993 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 994 | } |
e0130fab MD |
995 | mutex_unlock(&sessions_mutex); |
996 | return ret; | |
997 | } | |
998 | ||
d1f652f8 MD |
999 | int lttng_session_untrack_id(struct lttng_session *session, |
1000 | enum tracker_type tracker_type, int id) | |
e0130fab | 1001 | { |
d1f652f8 | 1002 | struct lttng_id_tracker *tracker; |
e0130fab MD |
1003 | int ret; |
1004 | ||
d1f652f8 MD |
1005 | tracker = get_tracker(session, tracker_type); |
1006 | if (!tracker) | |
1007 | return -EINVAL; | |
1008 | if (id < -1) | |
e0130fab MD |
1009 | return -EINVAL; |
1010 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1011 | if (id == -1) { |
1012 | /* untrack all ids: replace by empty tracker. */ | |
1013 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 1014 | } else { |
d1f652f8 | 1015 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 1016 | } |
e0130fab MD |
1017 | mutex_unlock(&sessions_mutex); |
1018 | return ret; | |
1019 | } | |
1020 | ||
7e6f9ef6 | 1021 | static |
d1f652f8 | 1022 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 1023 | { |
d1f652f8 MD |
1024 | struct lttng_id_tracker *id_tracker = m->private; |
1025 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1026 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1027 | int iter = 0, i; |
1028 | ||
1029 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
1030 | if (id_tracker_p) { |
1031 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1032 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1033 | |
f934e302 | 1034 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1035 | if (iter++ >= *pos) |
1036 | return e; | |
1037 | } | |
1038 | } | |
1039 | } else { | |
d1f652f8 | 1040 | /* ID tracker disabled. */ |
7e6f9ef6 | 1041 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1042 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1043 | } |
1044 | iter++; | |
1045 | } | |
1046 | /* End of list */ | |
1047 | return NULL; | |
1048 | } | |
1049 | ||
1050 | /* Called with sessions_mutex held. */ | |
1051 | static | |
d1f652f8 | 1052 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1053 | { |
d1f652f8 MD |
1054 | struct lttng_id_tracker *id_tracker = m->private; |
1055 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1056 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1057 | int iter = 0, i; |
1058 | ||
1059 | (*ppos)++; | |
d1f652f8 MD |
1060 | if (id_tracker_p) { |
1061 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1062 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1063 | |
f934e302 | 1064 | lttng_hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1065 | if (iter++ >= *ppos) |
1066 | return e; | |
1067 | } | |
1068 | } | |
1069 | } else { | |
d1f652f8 | 1070 | /* ID tracker disabled. */ |
7e6f9ef6 | 1071 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1072 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1073 | iter++; |
1074 | } | |
1075 | ||
1076 | /* End of list */ | |
1077 | return NULL; | |
1078 | } | |
1079 | ||
1080 | static | |
d1f652f8 | 1081 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1082 | { |
1083 | mutex_unlock(&sessions_mutex); | |
1084 | } | |
1085 | ||
1086 | static | |
d1f652f8 | 1087 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1088 | { |
d1f652f8 MD |
1089 | struct lttng_id_tracker *id_tracker = m->private; |
1090 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1091 | int id; | |
7e6f9ef6 | 1092 | |
d1f652f8 | 1093 | if (p == id_tracker_p) { |
7e6f9ef6 | 1094 | /* Tracker disabled. */ |
d1f652f8 | 1095 | id = -1; |
7e6f9ef6 | 1096 | } else { |
d1f652f8 | 1097 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1098 | |
d1f652f8 MD |
1099 | id = lttng_id_tracker_get_node_id(e); |
1100 | } | |
1101 | switch (id_tracker->tracker_type) { | |
1102 | case TRACKER_PID: | |
1103 | seq_printf(m, "process { pid = %d; };\n", id); | |
1104 | break; | |
1105 | case TRACKER_VPID: | |
1106 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1107 | break; | |
1108 | case TRACKER_UID: | |
1109 | seq_printf(m, "user { uid = %d; };\n", id); | |
1110 | break; | |
1111 | case TRACKER_VUID: | |
1112 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1113 | break; | |
1114 | case TRACKER_GID: | |
1115 | seq_printf(m, "group { gid = %d; };\n", id); | |
1116 | break; | |
1117 | case TRACKER_VGID: | |
1118 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1119 | break; | |
1120 | default: | |
1121 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1122 | } |
7e6f9ef6 MD |
1123 | return 0; |
1124 | } | |
1125 | ||
1126 | static | |
d1f652f8 MD |
1127 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1128 | .start = id_list_start, | |
1129 | .next = id_list_next, | |
1130 | .stop = id_list_stop, | |
1131 | .show = id_list_show, | |
7e6f9ef6 MD |
1132 | }; |
1133 | ||
1134 | static | |
d1f652f8 | 1135 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1136 | { |
d1f652f8 | 1137 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1138 | } |
1139 | ||
1140 | static | |
d1f652f8 | 1141 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1142 | { |
1143 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1144 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1145 | int ret; |
1146 | ||
d1f652f8 | 1147 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1148 | ret = seq_release(inode, file); |
d1f652f8 MD |
1149 | if (!ret) |
1150 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1151 | return ret; |
1152 | } | |
1153 | ||
d1f652f8 | 1154 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1155 | .owner = THIS_MODULE, |
d1f652f8 | 1156 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1157 | .read = seq_read, |
1158 | .llseek = seq_lseek, | |
d1f652f8 | 1159 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1160 | }; |
1161 | ||
d1f652f8 MD |
1162 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1163 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1164 | { |
d1f652f8 | 1165 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1166 | struct seq_file *m; |
1167 | int file_fd, ret; | |
1168 | ||
1169 | file_fd = lttng_get_unused_fd(); | |
1170 | if (file_fd < 0) { | |
1171 | ret = file_fd; | |
1172 | goto fd_error; | |
1173 | } | |
1174 | ||
d1f652f8 MD |
1175 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1176 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1177 | NULL, O_RDWR); |
d1f652f8 MD |
1178 | if (IS_ERR(tracker_ids_list_file)) { |
1179 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1180 | goto file_error; |
1181 | } | |
98d7281c MJ |
1182 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1183 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1184 | goto refcount_error; |
1185 | } | |
d1f652f8 | 1186 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1187 | if (ret < 0) |
1188 | goto open_error; | |
d1f652f8 MD |
1189 | m = tracker_ids_list_file->private_data; |
1190 | ||
1191 | m->private = get_tracker(session, tracker_type); | |
1192 | BUG_ON(!m->private); | |
1193 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1194 | |
1195 | return file_fd; | |
1196 | ||
1197 | open_error: | |
9c1f4643 MD |
1198 | atomic_long_dec(&session->file->f_count); |
1199 | refcount_error: | |
d1f652f8 | 1200 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1201 | file_error: |
1202 | put_unused_fd(file_fd); | |
1203 | fd_error: | |
1204 | return ret; | |
1205 | } | |
1206 | ||
3c997079 MD |
1207 | /* |
1208 | * Enabler management. | |
1209 | */ | |
1210 | static | |
4993071a PP |
1211 | int lttng_match_enabler_star_glob(const char *desc_name, |
1212 | const char *pattern) | |
3c997079 | 1213 | { |
cbc19040 MD |
1214 | if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX, |
1215 | desc_name, LTTNG_SIZE_MAX)) | |
3c997079 MD |
1216 | return 0; |
1217 | return 1; | |
1218 | } | |
1219 | ||
1220 | static | |
4ecb5ad5 MD |
1221 | int lttng_match_enabler_name(const char *desc_name, |
1222 | const char *name) | |
3c997079 | 1223 | { |
4ecb5ad5 | 1224 | if (strcmp(desc_name, name)) |
3c997079 MD |
1225 | return 0; |
1226 | return 1; | |
1227 | } | |
1228 | ||
1229 | static | |
1230 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1231 | struct lttng_enabler *enabler) | |
1232 | { | |
4ecb5ad5 | 1233 | const char *desc_name, *enabler_name; |
badfe9f5 | 1234 | bool compat = false, entry = false; |
4ecb5ad5 MD |
1235 | |
1236 | enabler_name = enabler->event_param.name; | |
1237 | switch (enabler->event_param.instrumentation) { | |
1238 | case LTTNG_KERNEL_TRACEPOINT: | |
1239 | desc_name = desc->name; | |
3b861b22 FD |
1240 | switch (enabler->format_type) { |
1241 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1242 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1243 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1244 | return lttng_match_enabler_name(desc_name, enabler_name); |
1245 | default: | |
1246 | return -EINVAL; | |
1247 | } | |
4ecb5ad5 MD |
1248 | break; |
1249 | case LTTNG_KERNEL_SYSCALL: | |
1250 | desc_name = desc->name; | |
badfe9f5 | 1251 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) { |
4ecb5ad5 | 1252 | desc_name += strlen("compat_"); |
badfe9f5 MD |
1253 | compat = true; |
1254 | } | |
4ecb5ad5 MD |
1255 | if (!strncmp(desc_name, "syscall_exit_", |
1256 | strlen("syscall_exit_"))) { | |
1257 | desc_name += strlen("syscall_exit_"); | |
1258 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1259 | strlen("syscall_entry_"))) { | |
1260 | desc_name += strlen("syscall_entry_"); | |
badfe9f5 | 1261 | entry = true; |
4ecb5ad5 MD |
1262 | } else { |
1263 | WARN_ON_ONCE(1); | |
1264 | return -EINVAL; | |
1265 | } | |
badfe9f5 MD |
1266 | switch (enabler->event_param.u.syscall.entryexit) { |
1267 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1268 | break; | |
1269 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
1270 | if (!entry) | |
1271 | return 0; | |
1272 | break; | |
1273 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
1274 | if (entry) | |
1275 | return 0; | |
1276 | break; | |
1277 | default: | |
1278 | return -EINVAL; | |
1279 | } | |
1280 | switch (enabler->event_param.u.syscall.abi) { | |
1281 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1282 | break; | |
1283 | case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: | |
1284 | if (compat) | |
1285 | return 0; | |
1286 | break; | |
1287 | case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: | |
1288 | if (!compat) | |
1289 | return 0; | |
1290 | break; | |
1291 | default: | |
1292 | return -EINVAL; | |
1293 | } | |
1294 | switch (enabler->event_param.u.syscall.match) { | |
1295 | case LTTNG_SYSCALL_MATCH_NAME: | |
3b861b22 FD |
1296 | switch (enabler->format_type) { |
1297 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
badfe9f5 | 1298 | return lttng_match_enabler_star_glob(desc_name, enabler_name); |
3b861b22 | 1299 | case LTTNG_ENABLER_FORMAT_NAME: |
badfe9f5 MD |
1300 | return lttng_match_enabler_name(desc_name, enabler_name); |
1301 | default: | |
1302 | return -EINVAL; | |
1303 | } | |
1304 | break; | |
1305 | case LTTNG_SYSCALL_MATCH_NR: | |
1306 | return -EINVAL; /* Not implemented. */ | |
1307 | default: | |
1308 | return -EINVAL; | |
1309 | } | |
4ecb5ad5 MD |
1310 | break; |
1311 | default: | |
1312 | WARN_ON_ONCE(1); | |
1313 | return -EINVAL; | |
1314 | } | |
3c997079 MD |
1315 | } |
1316 | ||
1317 | static | |
b2bc0bc8 FD |
1318 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
1319 | struct lttng_event *event) | |
3c997079 | 1320 | { |
b2bc0bc8 FD |
1321 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler( |
1322 | event_enabler); | |
1323 | ||
1324 | if (base_enabler->event_param.instrumentation != event->instrumentation) | |
33a39a3c | 1325 | return 0; |
b2bc0bc8 FD |
1326 | if (lttng_desc_match_enabler(event->desc, base_enabler) |
1327 | && event->chan == event_enabler->chan) | |
3c997079 MD |
1328 | return 1; |
1329 | else | |
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | static | |
b2bc0bc8 FD |
1334 | struct lttng_enabler_ref *lttng_enabler_ref( |
1335 | struct list_head *enablers_ref_list, | |
3c997079 MD |
1336 | struct lttng_enabler *enabler) |
1337 | { | |
1338 | struct lttng_enabler_ref *enabler_ref; | |
1339 | ||
b2bc0bc8 | 1340 | list_for_each_entry(enabler_ref, enablers_ref_list, node) { |
3c997079 MD |
1341 | if (enabler_ref->ref == enabler) |
1342 | return enabler_ref; | |
1343 | } | |
1344 | return NULL; | |
1345 | } | |
1346 | ||
3c997079 | 1347 | static |
b2bc0bc8 | 1348 | void lttng_create_tracepoint_if_missing(struct lttng_event_enabler *event_enabler) |
3c997079 | 1349 | { |
b2bc0bc8 | 1350 | struct lttng_session *session = event_enabler->chan->session; |
3c997079 MD |
1351 | struct lttng_probe_desc *probe_desc; |
1352 | const struct lttng_event_desc *desc; | |
1353 | int i; | |
1354 | struct list_head *probe_list; | |
1355 | ||
1356 | probe_list = lttng_get_probe_list_head(); | |
1357 | /* | |
1358 | * For each probe event, if we find that a probe event matches | |
1359 | * our enabler, create an associated lttng_event if not | |
1360 | * already present. | |
1361 | */ | |
1362 | list_for_each_entry(probe_desc, probe_list, head) { | |
1363 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1364 | int found = 0; | |
1365 | struct hlist_head *head; | |
1366 | const char *event_name; | |
1367 | size_t name_len; | |
1368 | uint32_t hash; | |
1369 | struct lttng_event *event; | |
1370 | ||
1371 | desc = probe_desc->event_desc[i]; | |
b2bc0bc8 FD |
1372 | if (!lttng_desc_match_enabler(desc, |
1373 | lttng_event_enabler_as_enabler(event_enabler))) | |
3c997079 MD |
1374 | continue; |
1375 | event_name = desc->name; | |
1376 | name_len = strlen(event_name); | |
1377 | ||
1378 | /* | |
1379 | * Check if already created. | |
1380 | */ | |
1381 | hash = jhash(event_name, name_len, 0); | |
1382 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
d216ecae | 1383 | lttng_hlist_for_each_entry(event, head, hlist) { |
3c997079 | 1384 | if (event->desc == desc |
b2bc0bc8 | 1385 | && event->chan == event_enabler->chan) |
3c997079 MD |
1386 | found = 1; |
1387 | } | |
1388 | if (found) | |
1389 | continue; | |
1390 | ||
1391 | /* | |
1392 | * We need to create an event for this | |
1393 | * event probe. | |
1394 | */ | |
b2bc0bc8 | 1395 | event = _lttng_event_create(event_enabler->chan, |
3c997079 MD |
1396 | NULL, NULL, desc, |
1397 | LTTNG_KERNEL_TRACEPOINT); | |
1398 | if (!event) { | |
5a15f70c | 1399 | printk(KERN_INFO "LTTng: Unable to create event %s\n", |
3c997079 MD |
1400 | probe_desc->event_desc[i]->name); |
1401 | } | |
1402 | } | |
1403 | } | |
1404 | } | |
1405 | ||
33a39a3c | 1406 | static |
b2bc0bc8 | 1407 | void lttng_create_syscall_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c MD |
1408 | { |
1409 | int ret; | |
1410 | ||
b2bc0bc8 | 1411 | ret = lttng_syscalls_register(event_enabler->chan, NULL); |
33a39a3c MD |
1412 | WARN_ON_ONCE(ret); |
1413 | } | |
1414 | ||
1415 | /* | |
1416 | * Create struct lttng_event if it is missing and present in the list of | |
1417 | * tracepoint probes. | |
1418 | * Should be called with sessions mutex held. | |
1419 | */ | |
1420 | static | |
b2bc0bc8 | 1421 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
33a39a3c | 1422 | { |
b2bc0bc8 | 1423 | switch (event_enabler->base.event_param.instrumentation) { |
33a39a3c | 1424 | case LTTNG_KERNEL_TRACEPOINT: |
b2bc0bc8 | 1425 | lttng_create_tracepoint_if_missing(event_enabler); |
33a39a3c MD |
1426 | break; |
1427 | case LTTNG_KERNEL_SYSCALL: | |
b2bc0bc8 | 1428 | lttng_create_syscall_if_missing(event_enabler); |
33a39a3c MD |
1429 | break; |
1430 | default: | |
1431 | WARN_ON_ONCE(1); | |
1432 | break; | |
1433 | } | |
1434 | } | |
1435 | ||
3c997079 | 1436 | /* |
b2bc0bc8 | 1437 | * Create events associated with an event_enabler (if not already present), |
3c997079 MD |
1438 | * and add backward reference from the event to the enabler. |
1439 | * Should be called with sessions mutex held. | |
1440 | */ | |
1441 | static | |
b2bc0bc8 | 1442 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
3c997079 | 1443 | { |
b2bc0bc8 FD |
1444 | struct lttng_channel *chan = event_enabler->chan; |
1445 | struct lttng_session *session = event_enabler->chan->session; | |
1446 | struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler); | |
3c997079 MD |
1447 | struct lttng_event *event; |
1448 | ||
b2bc0bc8 FD |
1449 | if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && |
1450 | base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && | |
1451 | base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && | |
1452 | base_enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME && | |
1453 | !strcmp(base_enabler->event_param.name, "*")) { | |
1454 | if (base_enabler->enabled) | |
badfe9f5 MD |
1455 | WRITE_ONCE(chan->syscall_all, 1); |
1456 | else | |
1457 | WRITE_ONCE(chan->syscall_all, 0); | |
1458 | } | |
1459 | ||
3c997079 | 1460 | /* First ensure that probe events are created for this enabler. */ |
b2bc0bc8 | 1461 | lttng_create_event_if_missing(event_enabler); |
3c997079 | 1462 | |
b2bc0bc8 | 1463 | /* For each event matching event_enabler in session event list. */ |
3c997079 MD |
1464 | list_for_each_entry(event, &session->events, list) { |
1465 | struct lttng_enabler_ref *enabler_ref; | |
1466 | ||
b2bc0bc8 | 1467 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
3c997079 | 1468 | continue; |
b2bc0bc8 FD |
1469 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1470 | lttng_event_enabler_as_enabler(event_enabler)); | |
3c997079 MD |
1471 | if (!enabler_ref) { |
1472 | /* | |
1473 | * If no backward ref, create it. | |
b2bc0bc8 | 1474 | * Add backward ref from event to event_enabler. |
3c997079 MD |
1475 | */ |
1476 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1477 | if (!enabler_ref) | |
1478 | return -ENOMEM; | |
b2bc0bc8 | 1479 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
3c997079 MD |
1480 | list_add(&enabler_ref->node, |
1481 | &event->enablers_ref_head); | |
1482 | } | |
1483 | ||
f127e61e MD |
1484 | /* |
1485 | * Link filter bytecodes if not linked yet. | |
1486 | */ | |
b2bc0bc8 | 1487 | lttng_event_enabler_link_bytecode(event, event_enabler); |
f127e61e | 1488 | |
3c997079 MD |
1489 | /* TODO: merge event context. */ |
1490 | } | |
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | /* | |
1495 | * Called at module load: connect the probe on all enablers matching | |
1496 | * this event. | |
1497 | * Called with sessions lock held. | |
1498 | */ | |
1499 | int lttng_fix_pending_events(void) | |
1500 | { | |
1501 | struct lttng_session *session; | |
1502 | ||
1503 | list_for_each_entry(session, &sessions, list) | |
b2bc0bc8 | 1504 | lttng_session_lazy_sync_event_enablers(session); |
3c997079 MD |
1505 | return 0; |
1506 | } | |
1507 | ||
b2bc0bc8 FD |
1508 | struct lttng_event_enabler *lttng_event_enabler_create( |
1509 | enum lttng_enabler_format_type format_type, | |
3c997079 MD |
1510 | struct lttng_kernel_event *event_param, |
1511 | struct lttng_channel *chan) | |
1512 | { | |
b2bc0bc8 | 1513 | struct lttng_event_enabler *event_enabler; |
3c997079 | 1514 | |
b2bc0bc8 FD |
1515 | event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL); |
1516 | if (!event_enabler) | |
3c997079 | 1517 | return NULL; |
b2bc0bc8 FD |
1518 | event_enabler->base.format_type = format_type; |
1519 | INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1520 | memcpy(&event_enabler->base.event_param, event_param, | |
1521 | sizeof(event_enabler->base.event_param)); | |
1522 | event_enabler->chan = chan; | |
3c997079 | 1523 | /* ctx left NULL */ |
b2bc0bc8 FD |
1524 | event_enabler->base.enabled = 0; |
1525 | event_enabler->base.evtype = LTTNG_TYPE_ENABLER; | |
3c997079 | 1526 | mutex_lock(&sessions_mutex); |
b2bc0bc8 FD |
1527 | list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); |
1528 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 | 1529 | mutex_unlock(&sessions_mutex); |
b2bc0bc8 | 1530 | return event_enabler; |
3c997079 MD |
1531 | } |
1532 | ||
b2bc0bc8 | 1533 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
1534 | { |
1535 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
1536 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1537 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
1538 | mutex_unlock(&sessions_mutex); |
1539 | return 0; | |
1540 | } | |
1541 | ||
b2bc0bc8 | 1542 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
3c997079 MD |
1543 | { |
1544 | mutex_lock(&sessions_mutex); | |
b2bc0bc8 FD |
1545 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1546 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
3c997079 MD |
1547 | mutex_unlock(&sessions_mutex); |
1548 | return 0; | |
1549 | } | |
1550 | ||
b2bc0bc8 | 1551 | static |
07dfc1d0 MD |
1552 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1553 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1554 | { | |
1555 | struct lttng_filter_bytecode_node *bytecode_node; | |
1556 | uint32_t bytecode_len; | |
1557 | int ret; | |
1558 | ||
1559 | ret = get_user(bytecode_len, &bytecode->len); | |
1560 | if (ret) | |
1561 | return ret; | |
1562 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1563 | GFP_KERNEL); | |
1564 | if (!bytecode_node) | |
1565 | return -ENOMEM; | |
1566 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1567 | sizeof(*bytecode) + bytecode_len); | |
1568 | if (ret) | |
1569 | goto error_free; | |
b2bc0bc8 | 1570 | |
07dfc1d0 MD |
1571 | bytecode_node->enabler = enabler; |
1572 | /* Enforce length based on allocated size */ | |
1573 | bytecode_node->bc.len = bytecode_len; | |
1574 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
b2bc0bc8 | 1575 | |
07dfc1d0 MD |
1576 | return 0; |
1577 | ||
1578 | error_free: | |
1579 | kfree(bytecode_node); | |
1580 | return ret; | |
1581 | } | |
1582 | ||
b2bc0bc8 FD |
1583 | int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler *event_enabler, |
1584 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1585 | { | |
1586 | int ret; | |
1587 | ret = lttng_enabler_attach_bytecode( | |
1588 | lttng_event_enabler_as_enabler(event_enabler), bytecode); | |
1589 | if (ret) | |
1590 | goto error; | |
1591 | ||
1592 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1593 | return 0; | |
1594 | ||
1595 | error: | |
1596 | return ret; | |
1597 | } | |
1598 | ||
3aed4dca FD |
1599 | int lttng_event_add_callsite(struct lttng_event *event, |
1600 | struct lttng_kernel_event_callsite __user *callsite) | |
1601 | { | |
1602 | ||
1603 | switch (event->instrumentation) { | |
1604 | case LTTNG_KERNEL_UPROBE: | |
1605 | return lttng_uprobes_add_callsite(event, callsite); | |
1606 | default: | |
1607 | return -EINVAL; | |
1608 | } | |
1609 | } | |
1610 | ||
b2bc0bc8 | 1611 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler, |
3c997079 MD |
1612 | struct lttng_kernel_context *context_param) |
1613 | { | |
1614 | return -ENOSYS; | |
1615 | } | |
1616 | ||
1617 | static | |
1618 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1619 | { | |
07dfc1d0 MD |
1620 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1621 | ||
1622 | /* Destroy filter bytecode */ | |
1623 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1624 | &enabler->filter_bytecode_head, node) { | |
1625 | kfree(filter_node); | |
1626 | } | |
b2bc0bc8 FD |
1627 | } |
1628 | ||
1629 | static | |
1630 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) | |
1631 | { | |
1632 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); | |
07dfc1d0 | 1633 | |
3c997079 | 1634 | /* Destroy contexts */ |
b2bc0bc8 | 1635 | lttng_destroy_context(event_enabler->ctx); |
3c997079 | 1636 | |
b2bc0bc8 FD |
1637 | list_del(&event_enabler->node); |
1638 | kfree(event_enabler); | |
3c997079 MD |
1639 | } |
1640 | ||
1641 | /* | |
b2bc0bc8 | 1642 | * lttng_session_sync_event_enablers should be called just before starting a |
3c997079 MD |
1643 | * session. |
1644 | * Should be called with sessions mutex held. | |
1645 | */ | |
1646 | static | |
b2bc0bc8 | 1647 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
3c997079 | 1648 | { |
b2bc0bc8 | 1649 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
1650 | struct lttng_event *event; |
1651 | ||
b2bc0bc8 FD |
1652 | list_for_each_entry(event_enabler, &session->enablers_head, node) |
1653 | lttng_event_enabler_ref_events(event_enabler); | |
3c997079 MD |
1654 | /* |
1655 | * For each event, if at least one of its enablers is enabled, | |
1656 | * and its channel and session transient states are enabled, we | |
1657 | * enable the event, else we disable it. | |
1658 | */ | |
1659 | list_for_each_entry(event, &session->events, list) { | |
1660 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1661 | struct lttng_bytecode_runtime *runtime; |
1662 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1663 | |
4ecb5ad5 MD |
1664 | switch (event->instrumentation) { |
1665 | case LTTNG_KERNEL_TRACEPOINT: | |
1666 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1667 | /* Enable events */ |
1668 | list_for_each_entry(enabler_ref, | |
1669 | &event->enablers_ref_head, node) { | |
1670 | if (enabler_ref->ref->enabled) { | |
1671 | enabled = 1; | |
1672 | break; | |
1673 | } | |
1674 | } | |
4ecb5ad5 MD |
1675 | break; |
1676 | default: | |
3c997079 MD |
1677 | /* Not handled with lazy sync. */ |
1678 | continue; | |
1679 | } | |
1680 | /* | |
1681 | * Enabled state is based on union of enablers, with | |
1682 | * intesection of session and channel transient enable | |
1683 | * states. | |
1684 | */ | |
1685 | enabled = enabled && session->tstate && event->chan->tstate; | |
1686 | ||
a8f2d0c7 | 1687 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1688 | /* |
1689 | * Sync tracepoint registration with event enabled | |
1690 | * state. | |
1691 | */ | |
1692 | if (enabled) { | |
1693 | register_event(event); | |
1694 | } else { | |
1695 | _lttng_event_unregister(event); | |
1696 | } | |
07dfc1d0 MD |
1697 | |
1698 | /* Check if has enablers without bytecode enabled */ | |
1699 | list_for_each_entry(enabler_ref, | |
1700 | &event->enablers_ref_head, node) { | |
1701 | if (enabler_ref->ref->enabled | |
1702 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1703 | has_enablers_without_bytecode = 1; | |
1704 | break; | |
1705 | } | |
1706 | } | |
1707 | event->has_enablers_without_bytecode = | |
1708 | has_enablers_without_bytecode; | |
1709 | ||
1710 | /* Enable filters */ | |
1711 | list_for_each_entry(runtime, | |
f127e61e | 1712 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1713 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1714 | } |
1715 | } | |
1716 | ||
1717 | /* | |
1718 | * Apply enablers to session events, adding events to session if need | |
1719 | * be. It is required after each modification applied to an active | |
1720 | * session, and right before session "start". | |
1721 | * "lazy" sync means we only sync if required. | |
1722 | * Should be called with sessions mutex held. | |
1723 | */ | |
1724 | static | |
b2bc0bc8 | 1725 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
3c997079 MD |
1726 | { |
1727 | /* We can skip if session is not active */ | |
1728 | if (!session->active) | |
1729 | return; | |
b2bc0bc8 | 1730 | lttng_session_sync_event_enablers(session); |
3c997079 MD |
1731 | } |
1732 | ||
1ec3f75a | 1733 | /* |
d83004aa JD |
1734 | * Serialize at most one packet worth of metadata into a metadata |
1735 | * channel. | |
92d9f5e6 MD |
1736 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1737 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1738 | * allows us to do racy operations such as looking for remaining space left in | |
1739 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1740 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1741 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1742 | * Returns the number of bytes written in the channel, 0 if no data |
1743 | * was written and a negative value on error. | |
1ec3f75a | 1744 | */ |
b3b8072b | 1745 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
8b97fd42 | 1746 | struct channel *chan, bool *coherent) |
d83004aa JD |
1747 | { |
1748 | struct lib_ring_buffer_ctx ctx; | |
1749 | int ret = 0; | |
1750 | size_t len, reserve_len; | |
1751 | ||
f613e3e6 | 1752 | /* |
92d9f5e6 MD |
1753 | * Ensure we support mutiple get_next / put sequences followed by |
1754 | * put_next. The metadata cache lock protects reading the metadata | |
1755 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1756 | * "flush" operations on the buffer invoked by different processes. | |
1757 | * Moreover, since the metadata cache memory can be reallocated, we | |
1758 | * need to have exclusive access against updates even though we only | |
1759 | * read it. | |
f613e3e6 | 1760 | */ |
92d9f5e6 | 1761 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1762 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1763 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1764 | goto end; |
f613e3e6 | 1765 | |
9616f0bf JD |
1766 | /* Metadata regenerated, change the version. */ |
1767 | if (stream->metadata_cache->version != stream->version) | |
1768 | stream->version = stream->metadata_cache->version; | |
1769 | ||
d83004aa | 1770 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1771 | stream->metadata_in; |
9de2c215 | 1772 | if (!len) |
de23d59d | 1773 | goto end; |
d83004aa | 1774 | reserve_len = min_t(size_t, |
b3b8072b | 1775 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1776 | len); |
b3b8072b | 1777 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1778 | sizeof(char), -1); |
1779 | /* | |
1780 | * If reservation failed, return an error to the caller. | |
1781 | */ | |
b3b8072b | 1782 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1783 | if (ret != 0) { |
1784 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
8b97fd42 | 1785 | stream->coherent = false; |
d83004aa JD |
1786 | goto end; |
1787 | } | |
b3b8072b | 1788 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1789 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1790 | reserve_len); |
b3b8072b | 1791 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1792 | stream->metadata_in += reserve_len; |
3e75e2a7 | 1793 | if (reserve_len < len) |
8b97fd42 MD |
1794 | stream->coherent = false; |
1795 | else | |
1796 | stream->coherent = true; | |
d83004aa JD |
1797 | ret = reserve_len; |
1798 | ||
1799 | end: | |
8b97fd42 MD |
1800 | if (coherent) |
1801 | *coherent = stream->coherent; | |
92d9f5e6 | 1802 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1803 | return ret; |
1804 | } | |
1805 | ||
8b97fd42 MD |
1806 | static |
1807 | void lttng_metadata_begin(struct lttng_session *session) | |
1808 | { | |
3e75e2a7 MD |
1809 | if (atomic_inc_return(&session->metadata_cache->producing) == 1) |
1810 | mutex_lock(&session->metadata_cache->lock); | |
8b97fd42 MD |
1811 | } |
1812 | ||
1813 | static | |
1814 | void lttng_metadata_end(struct lttng_session *session) | |
1815 | { | |
3e75e2a7 MD |
1816 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
1817 | if (atomic_dec_return(&session->metadata_cache->producing) == 0) { | |
1818 | struct lttng_metadata_stream *stream; | |
1819 | ||
3e75e2a7 MD |
1820 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) |
1821 | wake_up_interruptible(&stream->read_wait); | |
92143b2c | 1822 | mutex_unlock(&session->metadata_cache->lock); |
3e75e2a7 | 1823 | } |
8b97fd42 MD |
1824 | } |
1825 | ||
d83004aa JD |
1826 | /* |
1827 | * Write the metadata to the metadata cache. | |
1828 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1829 | * The metadata cache lock protects us from concurrent read access from |
1830 | * thread outputting metadata content to ring buffer. | |
8b97fd42 MD |
1831 | * The content of the printf is printed as a single atomic metadata |
1832 | * transaction. | |
d83004aa | 1833 | */ |
a90917c3 | 1834 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1835 | const char *fmt, ...) |
1836 | { | |
c099397a | 1837 | char *str; |
d83004aa | 1838 | size_t len; |
c099397a MD |
1839 | va_list ap; |
1840 | ||
585e5dcc | 1841 | WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); |
c099397a MD |
1842 | |
1843 | va_start(ap, fmt); | |
1844 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1845 | va_end(ap); | |
1846 | if (!str) | |
1847 | return -ENOMEM; | |
1848 | ||
1ec3f75a | 1849 | len = strlen(str); |
3e75e2a7 | 1850 | WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); |
d83004aa JD |
1851 | if (session->metadata_cache->metadata_written + len > |
1852 | session->metadata_cache->cache_alloc) { | |
1853 | char *tmp_cache_realloc; | |
1854 | unsigned int tmp_cache_alloc_size; | |
1855 | ||
1856 | tmp_cache_alloc_size = max_t(unsigned int, | |
1857 | session->metadata_cache->cache_alloc + len, | |
1858 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 1859 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1860 | if (!tmp_cache_realloc) |
1861 | goto err; | |
a606b6e8 ML |
1862 | if (session->metadata_cache->data) { |
1863 | memcpy(tmp_cache_realloc, | |
1864 | session->metadata_cache->data, | |
1865 | session->metadata_cache->cache_alloc); | |
1866 | vfree(session->metadata_cache->data); | |
1867 | } | |
1868 | ||
d83004aa JD |
1869 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1870 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1871 | } |
d83004aa JD |
1872 | memcpy(session->metadata_cache->data + |
1873 | session->metadata_cache->metadata_written, | |
1874 | str, len); | |
1875 | session->metadata_cache->metadata_written += len; | |
c099397a | 1876 | kfree(str); |
d83004aa | 1877 | |
d83004aa JD |
1878 | return 0; |
1879 | ||
1880 | err: | |
1881 | kfree(str); | |
1882 | return -ENOMEM; | |
c099397a MD |
1883 | } |
1884 | ||
f513b2bf MD |
1885 | static |
1886 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1887 | { | |
1888 | size_t i; | |
1889 | ||
1890 | for (i = 0; i < nesting; i++) { | |
1891 | int ret; | |
1892 | ||
1893 | ret = lttng_metadata_printf(session, " "); | |
1894 | if (ret) { | |
1895 | return ret; | |
1896 | } | |
1897 | } | |
1898 | return 0; | |
1899 | } | |
1900 | ||
ceabb767 MD |
1901 | static |
1902 | int lttng_field_name_statedump(struct lttng_session *session, | |
1903 | const struct lttng_event_field *field, | |
1904 | size_t nesting) | |
1905 | { | |
1906 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
1907 | } | |
1908 | ||
1909 | static | |
1910 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
1911 | const struct lttng_type *type, | |
1912 | size_t nesting) | |
1913 | { | |
1914 | int ret; | |
1915 | ||
1916 | WARN_ON_ONCE(type->atype != atype_integer); | |
1917 | ret = print_tabs(session, nesting); | |
1918 | if (ret) | |
1919 | return ret; | |
1920 | ret = lttng_metadata_printf(session, | |
1921 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
1922 | type->u.integer.size, | |
1923 | type->u.integer.alignment, | |
1924 | type->u.integer.signedness, | |
1925 | (type->u.integer.encoding == lttng_encode_none) | |
1926 | ? "none" | |
1927 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
1928 | ? "UTF8" | |
1929 | : "ASCII", | |
1930 | type->u.integer.base, | |
1931 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1932 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
1933 | #else | |
1934 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
1935 | #endif | |
1936 | ); | |
1937 | return ret; | |
1938 | } | |
1939 | ||
f513b2bf MD |
1940 | /* |
1941 | * Must be called with sessions_mutex held. | |
1942 | */ | |
1943 | static | |
1944 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1945 | const struct lttng_type *type, | |
1946 | size_t nesting) | |
1947 | { | |
1948 | int ret; | |
1949 | uint32_t i, nr_fields; | |
ceabb767 MD |
1950 | unsigned int alignment; |
1951 | ||
1952 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
1953 | |
1954 | ret = print_tabs(session, nesting); | |
1955 | if (ret) | |
1956 | return ret; | |
1957 | ret = lttng_metadata_printf(session, | |
1958 | "struct {\n"); | |
1959 | if (ret) | |
1960 | return ret; | |
ceabb767 | 1961 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
1962 | for (i = 0; i < nr_fields; i++) { |
1963 | const struct lttng_event_field *iter_field; | |
1964 | ||
ceabb767 | 1965 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
1966 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
1967 | if (ret) | |
1968 | return ret; | |
1969 | } | |
1970 | ret = print_tabs(session, nesting); | |
1971 | if (ret) | |
1972 | return ret; | |
ceabb767 MD |
1973 | alignment = type->u.struct_nestable.alignment; |
1974 | if (alignment) { | |
1975 | ret = lttng_metadata_printf(session, | |
1976 | "} align(%u)", | |
1977 | alignment); | |
1978 | } else { | |
1979 | ret = lttng_metadata_printf(session, | |
1980 | "}"); | |
1981 | } | |
f513b2bf MD |
1982 | return ret; |
1983 | } | |
1984 | ||
1985 | /* | |
1986 | * Must be called with sessions_mutex held. | |
1987 | */ | |
1988 | static | |
ceabb767 | 1989 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1990 | const struct lttng_event_field *field, |
1991 | size_t nesting) | |
1992 | { | |
1993 | int ret; | |
1994 | ||
1995 | ret = _lttng_struct_type_statedump(session, | |
1996 | &field->type, nesting); | |
1997 | if (ret) | |
1998 | return ret; | |
ceabb767 | 1999 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
2000 | } |
2001 | ||
65c85aa6 MD |
2002 | /* |
2003 | * Must be called with sessions_mutex held. | |
2004 | */ | |
2005 | static | |
2006 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
2007 | const struct lttng_type *type, | |
2008 | size_t nesting) | |
2009 | { | |
2010 | int ret; | |
2011 | uint32_t i, nr_choices; | |
2012 | ||
ceabb767 MD |
2013 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
2014 | /* | |
2015 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
2016 | */ | |
2017 | if (type->u.variant_nestable.alignment != 0) | |
2018 | return -EINVAL; | |
65c85aa6 MD |
2019 | ret = print_tabs(session, nesting); |
2020 | if (ret) | |
2021 | return ret; | |
2022 | ret = lttng_metadata_printf(session, | |
2023 | "variant <_%s> {\n", | |
ceabb767 | 2024 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
2025 | if (ret) |
2026 | return ret; | |
ceabb767 | 2027 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
2028 | for (i = 0; i < nr_choices; i++) { |
2029 | const struct lttng_event_field *iter_field; | |
2030 | ||
ceabb767 | 2031 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
2032 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
2033 | if (ret) | |
2034 | return ret; | |
2035 | } | |
2036 | ret = print_tabs(session, nesting); | |
2037 | if (ret) | |
2038 | return ret; | |
2039 | ret = lttng_metadata_printf(session, | |
2040 | "}"); | |
2041 | return ret; | |
2042 | } | |
2043 | ||
2044 | /* | |
2045 | * Must be called with sessions_mutex held. | |
2046 | */ | |
2047 | static | |
ceabb767 | 2048 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
2049 | const struct lttng_event_field *field, |
2050 | size_t nesting) | |
2051 | { | |
2052 | int ret; | |
2053 | ||
2054 | ret = _lttng_variant_type_statedump(session, | |
2055 | &field->type, nesting); | |
2056 | if (ret) | |
2057 | return ret; | |
ceabb767 | 2058 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
2059 | } |
2060 | ||
f513b2bf MD |
2061 | /* |
2062 | * Must be called with sessions_mutex held. | |
2063 | */ | |
2064 | static | |
ceabb767 | 2065 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2066 | const struct lttng_event_field *field, |
2067 | size_t nesting) | |
2068 | { | |
2069 | int ret; | |
2070 | const struct lttng_type *elem_type; | |
2071 | ||
ceabb767 MD |
2072 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
2073 | ||
2074 | if (field->type.u.array_nestable.alignment) { | |
2075 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2076 | if (ret) |
2077 | return ret; | |
ceabb767 MD |
2078 | ret = lttng_metadata_printf(session, |
2079 | "struct { } align(%u) _%s_padding;\n", | |
2080 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
2081 | field->name); | |
2082 | if (ret) | |
2083 | return ret; | |
2084 | } | |
2085 | /* | |
2086 | * Nested compound types: Only array of structures and variants are | |
2087 | * currently supported. | |
2088 | */ | |
2089 | elem_type = field->type.u.array_nestable.elem_type; | |
2090 | switch (elem_type->atype) { | |
2091 | case atype_integer: | |
2092 | case atype_struct_nestable: | |
2093 | case atype_variant_nestable: | |
2094 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2095 | if (ret) |
2096 | return ret; | |
2097 | break; | |
ceabb767 | 2098 | |
f513b2bf MD |
2099 | default: |
2100 | return -EINVAL; | |
2101 | } | |
2102 | ret = lttng_metadata_printf(session, | |
2103 | " _%s[%u];\n", | |
2104 | field->name, | |
ceabb767 | 2105 | field->type.u.array_nestable.length); |
f513b2bf MD |
2106 | return ret; |
2107 | } | |
2108 | ||
2109 | /* | |
2110 | * Must be called with sessions_mutex held. | |
2111 | */ | |
2112 | static | |
ceabb767 | 2113 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
2114 | const struct lttng_event_field *field, |
2115 | size_t nesting) | |
2116 | { | |
2117 | int ret; | |
2118 | const char *length_name; | |
2119 | const struct lttng_type *elem_type; | |
2120 | ||
ceabb767 | 2121 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 2122 | |
ceabb767 MD |
2123 | length_name = field->type.u.sequence_nestable.length_name; |
2124 | ||
2125 | if (field->type.u.sequence_nestable.alignment) { | |
2126 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
2127 | if (ret) |
2128 | return ret; | |
ceabb767 MD |
2129 | ret = lttng_metadata_printf(session, |
2130 | "struct { } align(%u) _%s_padding;\n", | |
2131 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
2132 | field->name); | |
2133 | if (ret) | |
2134 | return ret; | |
2135 | } | |
2136 | ||
2137 | /* | |
2138 | * Nested compound types: Only array of structures and variants are | |
2139 | * currently supported. | |
2140 | */ | |
2141 | elem_type = field->type.u.sequence_nestable.elem_type; | |
2142 | switch (elem_type->atype) { | |
2143 | case atype_integer: | |
2144 | case atype_struct_nestable: | |
2145 | case atype_variant_nestable: | |
2146 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
2147 | if (ret) |
2148 | return ret; | |
2149 | break; | |
ceabb767 | 2150 | |
f513b2bf MD |
2151 | default: |
2152 | return -EINVAL; | |
2153 | } | |
2154 | ret = lttng_metadata_printf(session, | |
2155 | " _%s[ _%s ];\n", | |
2156 | field->name, | |
ceabb767 | 2157 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
2158 | return ret; |
2159 | } | |
2160 | ||
141ddf28 MD |
2161 | /* |
2162 | * Must be called with sessions_mutex held. | |
2163 | */ | |
2164 | static | |
ceabb767 MD |
2165 | int _lttng_enum_type_statedump(struct lttng_session *session, |
2166 | const struct lttng_type *type, | |
141ddf28 MD |
2167 | size_t nesting) |
2168 | { | |
2169 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 2170 | const struct lttng_type *container_type; |
141ddf28 MD |
2171 | int ret; |
2172 | unsigned int i, nr_entries; | |
2173 | ||
ceabb767 MD |
2174 | container_type = type->u.enum_nestable.container_type; |
2175 | if (container_type->atype != atype_integer) { | |
2176 | ret = -EINVAL; | |
2177 | goto end; | |
2178 | } | |
2179 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
2180 | nr_entries = enum_desc->nr_entries; |
2181 | ||
2182 | ret = print_tabs(session, nesting); | |
2183 | if (ret) | |
2184 | goto end; | |
ceabb767 MD |
2185 | ret = lttng_metadata_printf(session, "enum : "); |
2186 | if (ret) | |
2187 | goto end; | |
2188 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 2189 | if (ret) |
ceabb767 MD |
2190 | goto end; |
2191 | ret = lttng_metadata_printf(session, " {\n"); | |
2192 | if (ret) | |
2193 | goto end; | |
141ddf28 MD |
2194 | /* Dump all entries */ |
2195 | for (i = 0; i < nr_entries; i++) { | |
2196 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2197 | int j, len; | |
2198 | ||
2199 | ret = print_tabs(session, nesting + 1); | |
2200 | if (ret) | |
2201 | goto end; | |
2202 | ret = lttng_metadata_printf(session, | |
2203 | "\""); | |
2204 | if (ret) | |
2205 | goto end; | |
2206 | len = strlen(entry->string); | |
2207 | /* Escape the character '"' */ | |
2208 | for (j = 0; j < len; j++) { | |
2209 | char c = entry->string[j]; | |
2210 | ||
2211 | switch (c) { | |
2212 | case '"': | |
2213 | ret = lttng_metadata_printf(session, | |
2214 | "\\\""); | |
2215 | break; | |
2216 | case '\\': | |
2217 | ret = lttng_metadata_printf(session, | |
2218 | "\\\\"); | |
2219 | break; | |
2220 | default: | |
2221 | ret = lttng_metadata_printf(session, | |
2222 | "%c", c); | |
2223 | break; | |
2224 | } | |
2225 | if (ret) | |
2226 | goto end; | |
2227 | } | |
08ad1061 PP |
2228 | ret = lttng_metadata_printf(session, "\""); |
2229 | if (ret) | |
2230 | goto end; | |
2231 | ||
2232 | if (entry->options.is_auto) { | |
2233 | ret = lttng_metadata_printf(session, ",\n"); | |
2234 | if (ret) | |
2235 | goto end; | |
141ddf28 | 2236 | } else { |
7c559490 MD |
2237 | ret = lttng_metadata_printf(session, |
2238 | " = "); | |
2239 | if (ret) | |
2240 | goto end; | |
2241 | if (entry->start.signedness) | |
141ddf28 | 2242 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2243 | "%lld", (long long) entry->start.value); |
2244 | else | |
2245 | ret = lttng_metadata_printf(session, | |
2246 | "%llu", entry->start.value); | |
2247 | if (ret) | |
2248 | goto end; | |
2249 | if (entry->start.signedness == entry->end.signedness && | |
2250 | entry->start.value | |
2251 | == entry->end.value) { | |
141ddf28 | 2252 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2253 | ",\n"); |
2254 | } else { | |
2255 | if (entry->end.signedness) { | |
2256 | ret = lttng_metadata_printf(session, | |
2257 | " ... %lld,\n", | |
2258 | (long long) entry->end.value); | |
2259 | } else { | |
2260 | ret = lttng_metadata_printf(session, | |
2261 | " ... %llu,\n", | |
2262 | entry->end.value); | |
2263 | } | |
141ddf28 | 2264 | } |
7c559490 MD |
2265 | if (ret) |
2266 | goto end; | |
141ddf28 | 2267 | } |
141ddf28 MD |
2268 | } |
2269 | ret = print_tabs(session, nesting); | |
2270 | if (ret) | |
2271 | goto end; | |
ceabb767 | 2272 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
2273 | end: |
2274 | return ret; | |
2275 | } | |
2276 | ||
d83004aa JD |
2277 | /* |
2278 | * Must be called with sessions_mutex held. | |
2279 | */ | |
c099397a | 2280 | static |
ceabb767 MD |
2281 | int _lttng_enum_field_statedump(struct lttng_session *session, |
2282 | const struct lttng_event_field *field, | |
2283 | size_t nesting) | |
2284 | { | |
2285 | int ret; | |
2286 | ||
2287 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
2288 | if (ret) | |
2289 | return ret; | |
2290 | return lttng_field_name_statedump(session, field, nesting); | |
2291 | } | |
2292 | ||
2293 | static | |
2294 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
2295 | const struct lttng_event_field *field, | |
2296 | size_t nesting) | |
2297 | { | |
2298 | int ret; | |
2299 | ||
2300 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
2301 | if (ret) | |
2302 | return ret; | |
2303 | return lttng_field_name_statedump(session, field, nesting); | |
2304 | } | |
2305 | ||
2306 | static | |
2307 | int _lttng_string_type_statedump(struct lttng_session *session, | |
2308 | const struct lttng_type *type, | |
2309 | size_t nesting) | |
2310 | { | |
2311 | int ret; | |
2312 | ||
2313 | WARN_ON_ONCE(type->atype != atype_string); | |
2314 | /* Default encoding is UTF8 */ | |
2315 | ret = print_tabs(session, nesting); | |
2316 | if (ret) | |
2317 | return ret; | |
2318 | ret = lttng_metadata_printf(session, | |
2319 | "string%s", | |
2320 | type->u.string.encoding == lttng_encode_ASCII ? | |
2321 | " { encoding = ASCII; }" : ""); | |
2322 | return ret; | |
2323 | } | |
2324 | ||
2325 | static | |
2326 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
2327 | const struct lttng_event_field *field, |
2328 | size_t nesting) | |
ceabb767 MD |
2329 | { |
2330 | int ret; | |
2331 | ||
2332 | WARN_ON_ONCE(field->type.atype != atype_string); | |
2333 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
2334 | if (ret) | |
2335 | return ret; | |
2336 | return lttng_field_name_statedump(session, field, nesting); | |
2337 | } | |
2338 | ||
2339 | /* | |
2340 | * Must be called with sessions_mutex held. | |
2341 | */ | |
2342 | static | |
2343 | int _lttng_type_statedump(struct lttng_session *session, | |
2344 | const struct lttng_type *type, | |
2345 | size_t nesting) | |
c099397a | 2346 | { |
c099397a | 2347 | int ret = 0; |
c099397a | 2348 | |
ceabb767 | 2349 | switch (type->atype) { |
8070f5c0 | 2350 | case atype_integer: |
ceabb767 | 2351 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 2352 | break; |
ceabb767 MD |
2353 | case atype_enum_nestable: |
2354 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 2355 | break; |
ceabb767 MD |
2356 | case atype_string: |
2357 | ret = _lttng_string_type_statedump(session, type, nesting); | |
2358 | break; | |
2359 | case atype_struct_nestable: | |
2360 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 2361 | break; |
ceabb767 MD |
2362 | case atype_variant_nestable: |
2363 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
2364 | break; | |
2365 | ||
2366 | /* Nested arrays and sequences are not supported yet. */ | |
2367 | case atype_array_nestable: | |
2368 | case atype_sequence_nestable: | |
2369 | default: | |
2370 | WARN_ON_ONCE(1); | |
2371 | return -EINVAL; | |
8070f5c0 | 2372 | } |
ceabb767 MD |
2373 | return ret; |
2374 | } | |
8070f5c0 | 2375 | |
ceabb767 MD |
2376 | /* |
2377 | * Must be called with sessions_mutex held. | |
2378 | */ | |
2379 | static | |
2380 | int _lttng_field_statedump(struct lttng_session *session, | |
2381 | const struct lttng_event_field *field, | |
2382 | size_t nesting) | |
2383 | { | |
2384 | int ret = 0; | |
27d2368e | 2385 | |
ceabb767 MD |
2386 | switch (field->type.atype) { |
2387 | case atype_integer: | |
2388 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
2389 | break; | |
2390 | case atype_enum_nestable: | |
2391 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 2392 | break; |
8070f5c0 | 2393 | case atype_string: |
ceabb767 | 2394 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 2395 | break; |
ceabb767 MD |
2396 | case atype_struct_nestable: |
2397 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 2398 | break; |
ceabb767 MD |
2399 | case atype_array_nestable: |
2400 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 2401 | break; |
ceabb767 MD |
2402 | case atype_sequence_nestable: |
2403 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 2404 | break; |
ceabb767 MD |
2405 | case atype_variant_nestable: |
2406 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 2407 | break; |
f513b2bf | 2408 | |
8070f5c0 MD |
2409 | default: |
2410 | WARN_ON_ONCE(1); | |
2411 | return -EINVAL; | |
2412 | } | |
2413 | return ret; | |
2414 | } | |
2415 | ||
2416 | static | |
a90917c3 | 2417 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2418 | struct lttng_ctx *ctx) |
2419 | { | |
2420 | int ret = 0; | |
2421 | int i; | |
2422 | ||
2423 | if (!ctx) | |
2424 | return 0; | |
2425 | for (i = 0; i < ctx->nr_fields; i++) { | |
2426 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2427 | ||
f513b2bf | 2428 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2429 | if (ret) |
2430 | return ret; | |
2431 | } | |
2432 | return ret; | |
2433 | } | |
2434 | ||
2435 | static | |
a90917c3 MD |
2436 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2437 | struct lttng_event *event) | |
8070f5c0 MD |
2438 | { |
2439 | const struct lttng_event_desc *desc = event->desc; | |
2440 | int ret = 0; | |
2441 | int i; | |
2442 | ||
2443 | for (i = 0; i < desc->nr_fields; i++) { | |
2444 | const struct lttng_event_field *field = &desc->fields[i]; | |
2445 | ||
f513b2bf | 2446 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2447 | if (ret) |
2448 | return ret; | |
c099397a MD |
2449 | } |
2450 | return ret; | |
2451 | } | |
2452 | ||
d83004aa JD |
2453 | /* |
2454 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
2455 | * The entire event metadata is printed as a single atomic metadata |
2456 | * transaction. | |
d83004aa | 2457 | */ |
c099397a | 2458 | static |
a90917c3 MD |
2459 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2460 | struct lttng_channel *chan, | |
2461 | struct lttng_event *event) | |
c099397a MD |
2462 | { |
2463 | int ret = 0; | |
2464 | ||
585e5dcc | 2465 | if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 2466 | return 0; |
d83004aa | 2467 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2468 | return 0; |
2469 | ||
8b97fd42 MD |
2470 | lttng_metadata_begin(session); |
2471 | ||
c099397a MD |
2472 | ret = lttng_metadata_printf(session, |
2473 | "event {\n" | |
ae734547 | 2474 | " name = \"%s\";\n" |
c099397a | 2475 | " id = %u;\n" |
b9074a1b | 2476 | " stream_id = %u;\n", |
c099397a MD |
2477 | event->desc->name, |
2478 | event->id, | |
2479 | event->chan->id); | |
2480 | if (ret) | |
2481 | goto end; | |
2482 | ||
b9074a1b MD |
2483 | if (event->ctx) { |
2484 | ret = lttng_metadata_printf(session, | |
2485 | " context := struct {\n"); | |
2486 | if (ret) | |
2487 | goto end; | |
2488 | } | |
a90917c3 | 2489 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2490 | if (ret) |
2491 | goto end; | |
b9074a1b MD |
2492 | if (event->ctx) { |
2493 | ret = lttng_metadata_printf(session, | |
2494 | " };\n"); | |
2495 | if (ret) | |
2496 | goto end; | |
2497 | } | |
8070f5c0 MD |
2498 | |
2499 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2500 | " fields := struct {\n" |
2501 | ); | |
2502 | if (ret) | |
2503 | goto end; | |
2504 | ||
a90917c3 | 2505 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2506 | if (ret) |
2507 | goto end; | |
2508 | ||
2509 | /* | |
2510 | * LTTng space reservation can only reserve multiples of the | |
2511 | * byte size. | |
2512 | */ | |
2513 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2514 | " };\n" |
2515 | "};\n\n"); | |
c099397a MD |
2516 | if (ret) |
2517 | goto end; | |
2518 | ||
c099397a MD |
2519 | event->metadata_dumped = 1; |
2520 | end: | |
8b97fd42 | 2521 | lttng_metadata_end(session); |
c099397a MD |
2522 | return ret; |
2523 | ||
2524 | } | |
2525 | ||
d83004aa JD |
2526 | /* |
2527 | * Must be called with sessions_mutex held. | |
8b97fd42 MD |
2528 | * The entire channel metadata is printed as a single atomic metadata |
2529 | * transaction. | |
d83004aa | 2530 | */ |
c099397a | 2531 | static |
a90917c3 MD |
2532 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2533 | struct lttng_channel *chan) | |
c099397a MD |
2534 | { |
2535 | int ret = 0; | |
2536 | ||
585e5dcc | 2537 | if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) |
c099397a | 2538 | return 0; |
d83004aa JD |
2539 | |
2540 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2541 | return 0; |
2542 | ||
8b97fd42 MD |
2543 | lttng_metadata_begin(session); |
2544 | ||
c099397a MD |
2545 | WARN_ON_ONCE(!chan->header_type); |
2546 | ret = lttng_metadata_printf(session, | |
2547 | "stream {\n" | |
2548 | " id = %u;\n" | |
9115fbdc | 2549 | " event.header := %s;\n" |
b9074a1b | 2550 | " packet.context := struct packet_context;\n", |
c099397a MD |
2551 | chan->id, |
2552 | chan->header_type == 1 ? "struct event_header_compact" : | |
2553 | "struct event_header_large"); | |
2554 | if (ret) | |
2555 | goto end; | |
2556 | ||
b9074a1b MD |
2557 | if (chan->ctx) { |
2558 | ret = lttng_metadata_printf(session, | |
2559 | " event.context := struct {\n"); | |
2560 | if (ret) | |
2561 | goto end; | |
2562 | } | |
a90917c3 | 2563 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2564 | if (ret) |
2565 | goto end; | |
b9074a1b MD |
2566 | if (chan->ctx) { |
2567 | ret = lttng_metadata_printf(session, | |
2568 | " };\n"); | |
2569 | if (ret) | |
2570 | goto end; | |
2571 | } | |
8070f5c0 MD |
2572 | |
2573 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2574 | "};\n\n"); |
8070f5c0 | 2575 | |
c099397a MD |
2576 | chan->metadata_dumped = 1; |
2577 | end: | |
8b97fd42 | 2578 | lttng_metadata_end(session); |
c099397a MD |
2579 | return ret; |
2580 | } | |
2581 | ||
d83004aa JD |
2582 | /* |
2583 | * Must be called with sessions_mutex held. | |
2584 | */ | |
9115fbdc | 2585 | static |
a90917c3 | 2586 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2587 | { |
2588 | return lttng_metadata_printf(session, | |
2589 | "struct packet_context {\n" | |
a3ccff4f MD |
2590 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2591 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2592 | " uint64_t content_size;\n" |
2593 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2594 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2595 | " unsigned long events_discarded;\n" |
9115fbdc | 2596 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2597 | "};\n\n" |
9115fbdc MD |
2598 | ); |
2599 | } | |
2600 | ||
2601 | /* | |
2602 | * Compact header: | |
2603 | * id: range: 0 - 30. | |
2604 | * id 31 is reserved to indicate an extended header. | |
2605 | * | |
2606 | * Large header: | |
2607 | * id: range: 0 - 65534. | |
2608 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2609 | * |
2610 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2611 | */ |
2612 | static | |
a90917c3 | 2613 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2614 | { |
2615 | return lttng_metadata_printf(session, | |
2616 | "struct event_header_compact {\n" | |
2617 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2618 | " variant <id> {\n" | |
2619 | " struct {\n" | |
a3ccff4f | 2620 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2621 | " } compact;\n" |
2622 | " struct {\n" | |
2623 | " uint32_t id;\n" | |
a3ccff4f | 2624 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2625 | " } extended;\n" |
2626 | " } v;\n" | |
2627 | "} align(%u);\n" | |
2628 | "\n" | |
2629 | "struct event_header_large {\n" | |
2630 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2631 | " variant <id> {\n" | |
2632 | " struct {\n" | |
a3ccff4f | 2633 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2634 | " } compact;\n" |
2635 | " struct {\n" | |
2636 | " uint32_t id;\n" | |
a3ccff4f | 2637 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2638 | " } extended;\n" |
2639 | " } v;\n" | |
2640 | "} align(%u);\n\n", | |
a90917c3 MD |
2641 | lttng_alignof(uint32_t) * CHAR_BIT, |
2642 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2643 | ); |
2644 | } | |
2645 | ||
a3ccff4f MD |
2646 | /* |
2647 | * Approximation of NTP time of day to clock monotonic correlation, | |
2648 | * taken at start of trace. | |
2649 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2650 | * in future versions. | |
5283350b MD |
2651 | * This function may return a negative offset. It may happen if the |
2652 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
2653 | * |
2654 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
2655 | * y2038 compliant. | |
a3ccff4f MD |
2656 | */ |
2657 | static | |
8967b2a3 | 2658 | int64_t measure_clock_offset(void) |
a3ccff4f | 2659 | { |
dcb93448 | 2660 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2661 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2662 | int64_t offset; |
a3ccff4f | 2663 | unsigned long flags; |
3636085f MJ |
2664 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2665 | struct timespec64 rts = { 0, 0 }; | |
2666 | #else | |
2667 | struct timespec rts = { 0, 0 }; | |
2668 | #endif | |
a3ccff4f MD |
2669 | |
2670 | /* Disable interrupts to increase correlation precision. */ | |
2671 | local_irq_save(flags); | |
2672 | monotonic[0] = trace_clock_read64(); | |
3636085f MJ |
2673 | #ifdef LTTNG_KERNEL_HAS_TIMESPEC64 |
2674 | ktime_get_real_ts64(&rts); | |
2675 | #else | |
216b6baa | 2676 | getnstimeofday(&rts); |
3636085f | 2677 | #endif |
a3ccff4f MD |
2678 | monotonic[1] = trace_clock_read64(); |
2679 | local_irq_restore(flags); | |
2680 | ||
dcb93448 | 2681 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2682 | realtime = (uint64_t) rts.tv_sec * tcf; |
2683 | if (tcf == NSEC_PER_SEC) { | |
2684 | realtime += rts.tv_nsec; | |
2685 | } else { | |
2686 | uint64_t n = rts.tv_nsec * tcf; | |
2687 | ||
2688 | do_div(n, NSEC_PER_SEC); | |
2689 | realtime += n; | |
2690 | } | |
dcb93448 | 2691 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2692 | return offset; |
2693 | } | |
2694 | ||
3eb95be4 JR |
2695 | static |
2696 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
2697 | { | |
0f3eaad4 | 2698 | int ret = 0; |
3eb95be4 JR |
2699 | size_t i; |
2700 | char cur; | |
2701 | ||
2702 | i = 0; | |
2703 | cur = string[i]; | |
2704 | while (cur != '\0') { | |
2705 | switch (cur) { | |
2706 | case '\n': | |
2707 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
2708 | break; | |
2709 | case '\\': | |
2710 | case '"': | |
2711 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
2712 | if (ret) | |
2713 | goto error; | |
2714 | /* We still print the current char */ | |
2715 | /* Fallthrough */ | |
2716 | default: | |
2717 | ret = lttng_metadata_printf(session, "%c", cur); | |
2718 | break; | |
2719 | } | |
2720 | ||
2721 | if (ret) | |
2722 | goto error; | |
2723 | ||
2724 | cur = string[++i]; | |
2725 | } | |
2726 | error: | |
2727 | return ret; | |
2728 | } | |
2729 | ||
2730 | static | |
1c88f269 JR |
2731 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
2732 | const char *field_value) | |
3eb95be4 JR |
2733 | { |
2734 | int ret; | |
2735 | ||
1c88f269 | 2736 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
2737 | if (ret) |
2738 | goto error; | |
2739 | ||
1c88f269 | 2740 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
2741 | if (ret) |
2742 | goto error; | |
2743 | ||
2744 | ret = lttng_metadata_printf(session, "\";\n"); | |
2745 | ||
2746 | error: | |
2747 | return ret; | |
2748 | } | |
2749 | ||
c099397a MD |
2750 | /* |
2751 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2752 | * Must be called with sessions_mutex held. |
c099397a MD |
2753 | */ |
2754 | static | |
a90917c3 | 2755 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2756 | { |
30bdb6e4 | 2757 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2758 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 2759 | const char *product_uuid; |
a90917c3 MD |
2760 | struct lttng_channel *chan; |
2761 | struct lttng_event *event; | |
c099397a MD |
2762 | int ret = 0; |
2763 | ||
585e5dcc | 2764 | if (!LTTNG_READ_ONCE(session->active)) |
c099397a | 2765 | return 0; |
8b97fd42 MD |
2766 | |
2767 | lttng_metadata_begin(session); | |
2768 | ||
c099397a MD |
2769 | if (session->metadata_dumped) |
2770 | goto skip_session; | |
c099397a | 2771 | |
d793d5e1 | 2772 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2773 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2774 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2775 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2776 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2777 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2778 | |
2779 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2780 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2781 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2782 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2783 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2784 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2785 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2786 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2787 | "\n" |
2788 | "trace {\n" | |
2789 | " major = %u;\n" | |
2790 | " minor = %u;\n" | |
30bdb6e4 | 2791 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2792 | " byte_order = %s;\n" |
2793 | " packet.header := struct {\n" | |
2794 | " uint32_t magic;\n" | |
1ec3f75a | 2795 | " uint8_t uuid[16];\n" |
d793d5e1 | 2796 | " uint32_t stream_id;\n" |
5594698f | 2797 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2798 | " };\n" |
d793d5e1 | 2799 | "};\n\n", |
a90917c3 MD |
2800 | lttng_alignof(uint8_t) * CHAR_BIT, |
2801 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2802 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2803 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2804 | sizeof(unsigned long) * CHAR_BIT, |
2805 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2806 | CTF_SPEC_MAJOR, |
2807 | CTF_SPEC_MINOR, | |
d793d5e1 | 2808 | uuid_s, |
5214fa50 | 2809 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2810 | "be" |
2811 | #else | |
2812 | "le" | |
2813 | #endif | |
2814 | ); | |
2815 | if (ret) | |
2816 | goto end; | |
2817 | ||
99dc9597 MD |
2818 | ret = lttng_metadata_printf(session, |
2819 | "env {\n" | |
a6058143 | 2820 | " hostname = \"%s\";\n" |
c6c9e10f | 2821 | " domain = \"kernel\";\n" |
99dc9597 | 2822 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2823 | " kernel_release = \"%s\";\n" |
2824 | " kernel_version = \"%s\";\n" | |
2825 | " tracer_name = \"lttng-modules\";\n" | |
2826 | " tracer_major = %d;\n" | |
2827 | " tracer_minor = %d;\n" | |
2828 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 2829 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 2830 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2831 | utsname()->sysname, |
2832 | utsname()->release, | |
c6c9e10f MD |
2833 | utsname()->version, |
2834 | LTTNG_MODULES_MAJOR_VERSION, | |
2835 | LTTNG_MODULES_MINOR_VERSION, | |
2836 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2837 | ); |
2838 | if (ret) | |
2839 | goto end; | |
2840 | ||
1c88f269 JR |
2841 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
2842 | if (ret) | |
2843 | goto end; | |
2844 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
2845 | session->creation_time); | |
3eb95be4 JR |
2846 | if (ret) |
2847 | goto end; | |
2848 | ||
c88f762e GB |
2849 | /* Add the product UUID to the 'env' section */ |
2850 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
2851 | if (product_uuid) { | |
2852 | ret = lttng_metadata_printf(session, | |
2853 | " product_uuid = \"%s\";\n", | |
2854 | product_uuid | |
2855 | ); | |
2856 | if (ret) | |
2857 | goto end; | |
2858 | } | |
2859 | ||
2860 | /* Close the 'env' section */ | |
3eb95be4 JR |
2861 | ret = lttng_metadata_printf(session, "};\n\n"); |
2862 | if (ret) | |
2863 | goto end; | |
2864 | ||
a3ccff4f MD |
2865 | ret = lttng_metadata_printf(session, |
2866 | "clock {\n" | |
2754583e MD |
2867 | " name = \"%s\";\n", |
2868 | trace_clock_name() | |
a82c63f1 MD |
2869 | ); |
2870 | if (ret) | |
2871 | goto end; | |
2872 | ||
2873 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2874 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2875 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2876 | clock_uuid_s |
2877 | ); | |
2878 | if (ret) | |
2879 | goto end; | |
2880 | } | |
2881 | ||
2882 | ret = lttng_metadata_printf(session, | |
2754583e | 2883 | " description = \"%s\";\n" |
a3ccff4f MD |
2884 | " freq = %llu; /* Frequency, in Hz */\n" |
2885 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2886 | " offset = %lld;\n" |
a3ccff4f | 2887 | "};\n\n", |
2754583e | 2888 | trace_clock_description(), |
a3ccff4f | 2889 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2890 | (long long) measure_clock_offset() |
a3ccff4f MD |
2891 | ); |
2892 | if (ret) | |
2893 | goto end; | |
2894 | ||
2895 | ret = lttng_metadata_printf(session, | |
2896 | "typealias integer {\n" | |
2897 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2898 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2899 | "} := uint27_clock_monotonic_t;\n" |
2900 | "\n" | |
2901 | "typealias integer {\n" | |
2902 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2903 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2904 | "} := uint32_clock_monotonic_t;\n" |
2905 | "\n" | |
2906 | "typealias integer {\n" | |
2907 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2908 | " map = clock.%s.value;\n" |
a3ccff4f | 2909 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2910 | trace_clock_name(), |
a3ccff4f | 2911 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2912 | trace_clock_name(), |
2913 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2914 | trace_clock_name() | |
a3ccff4f MD |
2915 | ); |
2916 | if (ret) | |
2917 | goto end; | |
2918 | ||
a90917c3 | 2919 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2920 | if (ret) |
2921 | goto end; | |
2922 | ||
a90917c3 | 2923 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2924 | if (ret) |
2925 | goto end; | |
2926 | ||
c099397a MD |
2927 | skip_session: |
2928 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2929 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2930 | if (ret) |
2931 | goto end; | |
2932 | } | |
2933 | ||
2934 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2935 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2936 | if (ret) |
2937 | goto end; | |
2938 | } | |
2939 | session->metadata_dumped = 1; | |
2940 | end: | |
8b97fd42 | 2941 | lttng_metadata_end(session); |
c099397a MD |
2942 | return ret; |
2943 | } | |
2944 | ||
c0e31d2e | 2945 | /** |
a90917c3 | 2946 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2947 | * @transport: transport structure |
2948 | * | |
2949 | * Registers a transport which can be used as output to extract the data out of | |
2950 | * LTTng. The module calling this registration function must ensure that no | |
2951 | * trap-inducing code will be executed by the transport functions. E.g. | |
263b6c88 | 2952 | * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory |
c0e31d2e | 2953 | * is made visible to the transport function. This registration acts as a |
263b6c88 | 2954 | * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory |
c0e31d2e MD |
2955 | * after its registration must it synchronize the TLBs. |
2956 | */ | |
a90917c3 | 2957 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e MD |
2958 | { |
2959 | /* | |
2960 | * Make sure no page fault can be triggered by the module about to be | |
2961 | * registered. We deal with this here so we don't have to call | |
263b6c88 | 2962 | * vmalloc_sync_mappings() in each module's init. |
c0e31d2e | 2963 | */ |
263b6c88 | 2964 | wrapper_vmalloc_sync_mappings(); |
c0e31d2e MD |
2965 | |
2966 | mutex_lock(&sessions_mutex); | |
a90917c3 | 2967 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2968 | mutex_unlock(&sessions_mutex); |
2969 | } | |
a90917c3 | 2970 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2971 | |
2972 | /** | |
a90917c3 | 2973 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2974 | * @transport: transport structure |
2975 | */ | |
a90917c3 | 2976 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2977 | { |
2978 | mutex_lock(&sessions_mutex); | |
2979 | list_del(&transport->node); | |
2980 | mutex_unlock(&sessions_mutex); | |
2981 | } | |
a90917c3 | 2982 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2983 | |
894ce5dc | 2984 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2985 | |
2986 | enum cpuhp_state lttng_hp_prepare; | |
2987 | enum cpuhp_state lttng_hp_online; | |
2988 | ||
2989 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2990 | { | |
2991 | struct lttng_cpuhp_node *lttng_node; | |
2992 | ||
2993 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2994 | switch (lttng_node->component) { | |
2995 | case LTTNG_RING_BUFFER_FRONTEND: | |
2996 | return 0; | |
2997 | case LTTNG_RING_BUFFER_BACKEND: | |
2998 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2999 | case LTTNG_RING_BUFFER_ITER: | |
3000 | return 0; | |
3001 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3002 | return 0; | |
3003 | default: | |
3004 | return -EINVAL; | |
3005 | } | |
3006 | } | |
3007 | ||
3008 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
3009 | { | |
3010 | struct lttng_cpuhp_node *lttng_node; | |
3011 | ||
3012 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3013 | switch (lttng_node->component) { | |
3014 | case LTTNG_RING_BUFFER_FRONTEND: | |
3015 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
3016 | case LTTNG_RING_BUFFER_BACKEND: | |
3017 | return 0; | |
3018 | case LTTNG_RING_BUFFER_ITER: | |
3019 | return 0; | |
3020 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3021 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
3022 | default: | |
3023 | return -EINVAL; | |
3024 | } | |
3025 | } | |
3026 | ||
3027 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
3028 | { | |
3029 | struct lttng_cpuhp_node *lttng_node; | |
3030 | ||
3031 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3032 | switch (lttng_node->component) { | |
3033 | case LTTNG_RING_BUFFER_FRONTEND: | |
3034 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
3035 | case LTTNG_RING_BUFFER_BACKEND: | |
3036 | return 0; | |
3037 | case LTTNG_RING_BUFFER_ITER: | |
3038 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
3039 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3040 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
3041 | default: | |
3042 | return -EINVAL; | |
3043 | } | |
3044 | } | |
3045 | ||
3046 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
3047 | { | |
3048 | struct lttng_cpuhp_node *lttng_node; | |
3049 | ||
3050 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
3051 | switch (lttng_node->component) { | |
3052 | case LTTNG_RING_BUFFER_FRONTEND: | |
3053 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
3054 | case LTTNG_RING_BUFFER_BACKEND: | |
3055 | return 0; | |
3056 | case LTTNG_RING_BUFFER_ITER: | |
3057 | return 0; | |
3058 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
3059 | return 0; | |
3060 | default: | |
3061 | return -EINVAL; | |
3062 | } | |
3063 | } | |
3064 | ||
3065 | static int __init lttng_init_cpu_hotplug(void) | |
3066 | { | |
3067 | int ret; | |
3068 | ||
3069 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
3070 | lttng_hotplug_prepare, | |
3071 | lttng_hotplug_dead); | |
3072 | if (ret < 0) { | |
3073 | return ret; | |
3074 | } | |
3075 | lttng_hp_prepare = ret; | |
3076 | lttng_rb_set_hp_prepare(ret); | |
3077 | ||
3078 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
3079 | lttng_hotplug_online, | |
3080 | lttng_hotplug_offline); | |
3081 | if (ret < 0) { | |
3082 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3083 | lttng_hp_prepare = 0; | |
3084 | return ret; | |
3085 | } | |
3086 | lttng_hp_online = ret; | |
3087 | lttng_rb_set_hp_online(ret); | |
3088 | ||
3089 | return 0; | |
3090 | } | |
3091 | ||
3092 | static void __exit lttng_exit_cpu_hotplug(void) | |
3093 | { | |
3094 | lttng_rb_set_hp_online(0); | |
3095 | cpuhp_remove_multi_state(lttng_hp_online); | |
3096 | lttng_rb_set_hp_prepare(0); | |
3097 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
3098 | } | |
3099 | ||
1ee63d8d | 3100 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3101 | static int lttng_init_cpu_hotplug(void) |
3102 | { | |
3103 | return 0; | |
3104 | } | |
3105 | static void lttng_exit_cpu_hotplug(void) | |
3106 | { | |
3107 | } | |
1ee63d8d | 3108 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
3109 | |
3110 | ||
a90917c3 | 3111 | static int __init lttng_events_init(void) |
4e3c1b9b | 3112 | { |
1c25284c MD |
3113 | int ret; |
3114 | ||
453b2495 JD |
3115 | ret = wrapper_lttng_fixup_sig(THIS_MODULE); |
3116 | if (ret) | |
3117 | return ret; | |
389d7070 | 3118 | ret = wrapper_get_pfnblock_flags_mask_init(); |
36561775 MD |
3119 | if (ret) |
3120 | return ret; | |
3121 | ret = wrapper_get_pageblock_flags_mask_init(); | |
114667d5 MD |
3122 | if (ret) |
3123 | return ret; | |
3124 | ret = lttng_probes_init(); | |
389d7070 MD |
3125 | if (ret) |
3126 | return ret; | |
07dfc1d0 | 3127 | ret = lttng_context_init(); |
20591cf7 MD |
3128 | if (ret) |
3129 | return ret; | |
07dfc1d0 MD |
3130 | ret = lttng_tracepoint_init(); |
3131 | if (ret) | |
3132 | goto error_tp; | |
a90917c3 | 3133 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
3134 | if (!event_cache) { |
3135 | ret = -ENOMEM; | |
3136 | goto error_kmem; | |
3137 | } | |
80996790 | 3138 | ret = lttng_abi_init(); |
02119ee5 MD |
3139 | if (ret) |
3140 | goto error_abi; | |
0c956676 MD |
3141 | ret = lttng_logger_init(); |
3142 | if (ret) | |
3143 | goto error_logger; | |
1e367326 MD |
3144 | ret = lttng_init_cpu_hotplug(); |
3145 | if (ret) | |
3146 | goto error_hotplug; | |
101215b7 | 3147 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3148 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3149 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3150 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3151 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3152 | LTTNG_VERSION_NAME, |
3153 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3154 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3155 | #else | |
3156 | "", | |
3157 | #endif | |
3158 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3159 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3160 | #else | |
3161 | ""); | |
3162 | #endif | |
4e3c1b9b | 3163 | return 0; |
0c956676 | 3164 | |
1e367326 MD |
3165 | error_hotplug: |
3166 | lttng_logger_exit(); | |
0c956676 MD |
3167 | error_logger: |
3168 | lttng_abi_exit(); | |
02119ee5 | 3169 | error_abi: |
1c25284c | 3170 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
3171 | error_kmem: |
3172 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
3173 | error_tp: |
3174 | lttng_context_exit(); | |
101215b7 | 3175 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3176 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3177 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3178 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3179 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3180 | LTTNG_VERSION_NAME, |
3181 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3182 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3183 | #else | |
3184 | "", | |
3185 | #endif | |
3186 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3187 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3188 | #else | |
3189 | ""); | |
3190 | #endif | |
1c25284c | 3191 | return ret; |
4e3c1b9b MD |
3192 | } |
3193 | ||
a90917c3 | 3194 | module_init(lttng_events_init); |
11b5a3c2 | 3195 | |
a90917c3 | 3196 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 3197 | { |
a90917c3 | 3198 | struct lttng_session *session, *tmpsession; |
92e94819 | 3199 | |
1e367326 | 3200 | lttng_exit_cpu_hotplug(); |
0c956676 | 3201 | lttng_logger_exit(); |
80996790 | 3202 | lttng_abi_exit(); |
92e94819 | 3203 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 3204 | lttng_session_destroy(session); |
11b5a3c2 | 3205 | kmem_cache_destroy(event_cache); |
20591cf7 | 3206 | lttng_tracepoint_exit(); |
07dfc1d0 | 3207 | lttng_context_exit(); |
101215b7 | 3208 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3209 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3210 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3211 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3212 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3213 | LTTNG_VERSION_NAME, |
3214 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3215 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3216 | #else | |
3217 | "", | |
3218 | #endif | |
3219 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3220 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3221 | #else | |
3222 | ""); | |
3223 | #endif | |
4e3c1b9b | 3224 | } |
92e94819 | 3225 | |
a90917c3 | 3226 | module_exit(lttng_events_exit); |
11b5a3c2 | 3227 | |
7ca11e77 | 3228 | #include <generated/patches.h> |
101215b7 MJ |
3229 | #ifdef LTTNG_EXTRA_VERSION_GIT |
3230 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3231 | #endif | |
3232 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3233 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3234 | #endif | |
92e94819 MD |
3235 | MODULE_LICENSE("GPL and additional rights"); |
3236 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3237 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3238 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3239 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3240 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3241 | LTTNG_MODULES_EXTRAVERSION); |