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 | ||
10 | #include <linux/module.h> | |
c0e31d2e MD |
11 | #include <linux/mutex.h> |
12 | #include <linux/sched.h> | |
11b5a3c2 | 13 | #include <linux/slab.h> |
c099397a | 14 | #include <linux/jiffies.h> |
99dc9597 | 15 | #include <linux/utsname.h> |
abc0446a | 16 | #include <linux/err.h> |
7e6f9ef6 MD |
17 | #include <linux/seq_file.h> |
18 | #include <linux/file.h> | |
19 | #include <linux/anon_inodes.h> | |
3c997079 | 20 | #include <linux/jhash.h> |
8c6e7f13 | 21 | #include <linux/uaccess.h> |
41f229dc | 22 | #include <linux/uuid.h> |
c88f762e | 23 | #include <linux/dmi.h> |
c50bdba2 | 24 | #include <linux/vmalloc.h> |
48ccd619 | 25 | #include <linux/limits.h> |
3c997079 | 26 | |
241ae9a8 | 27 | #include <wrapper/random.h> |
241ae9a8 MD |
28 | #include <lttng-kernel-version.h> |
29 | #include <lttng-events.h> | |
30 | #include <lttng-tracer.h> | |
31 | #include <lttng-abi-old.h> | |
5214fa50 | 32 | #include <lttng-endian.h> |
4993071a | 33 | #include <lttng-string-utils.h> |
0d260d3d | 34 | #include <lttng-tracepoint.h> |
64af2437 MD |
35 | #include <wrapper/ringbuffer/backend.h> |
36 | #include <wrapper/ringbuffer/frontend.h> | |
4e3c1b9b | 37 | |
d83004aa JD |
38 | #define METADATA_CACHE_DEFAULT_SIZE 4096 |
39 | ||
4e3c1b9b | 40 | static LIST_HEAD(sessions); |
a90917c3 | 41 | static LIST_HEAD(lttng_transport_list); |
d83004aa JD |
42 | /* |
43 | * Protect the sessions and metadata caches. | |
44 | */ | |
4e3c1b9b MD |
45 | static DEFINE_MUTEX(sessions_mutex); |
46 | static struct kmem_cache *event_cache; | |
47 | ||
3c997079 MD |
48 | static void lttng_session_lazy_sync_enablers(struct lttng_session *session); |
49 | static void lttng_session_sync_enablers(struct lttng_session *session); | |
50 | static void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
51 | ||
a90917c3 MD |
52 | static void _lttng_event_destroy(struct lttng_event *event); |
53 | static void _lttng_channel_destroy(struct lttng_channel *chan); | |
54 | static int _lttng_event_unregister(struct lttng_event *event); | |
c099397a | 55 | static |
a90917c3 MD |
56 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
57 | struct lttng_channel *chan, | |
58 | struct lttng_event *event); | |
c099397a | 59 | static |
a90917c3 | 60 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
d83004aa JD |
61 | static |
62 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream); | |
f513b2bf | 63 | static |
ceabb767 MD |
64 | int _lttng_type_statedump(struct lttng_session *session, |
65 | const struct lttng_type *type, | |
66 | size_t nesting); | |
67 | static | |
f513b2bf MD |
68 | int _lttng_field_statedump(struct lttng_session *session, |
69 | const struct lttng_event_field *field, | |
70 | size_t nesting); | |
c099397a | 71 | |
c099397a | 72 | void synchronize_trace(void) |
abcca994 | 73 | { |
92da05ce MJ |
74 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) |
75 | synchronize_rcu(); | |
76 | #else | |
abcca994 | 77 | synchronize_sched(); |
92da05ce MJ |
78 | #endif |
79 | ||
b8590f40 MD |
80 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) |
81 | #ifdef CONFIG_PREEMPT_RT_FULL | |
82 | synchronize_rcu(); | |
83 | #endif | |
84 | #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ | |
abcca994 MD |
85 | #ifdef CONFIG_PREEMPT_RT |
86 | synchronize_rcu(); | |
87 | #endif | |
b8590f40 | 88 | #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ |
abcca994 MD |
89 | } |
90 | ||
3c997079 MD |
91 | void lttng_lock_sessions(void) |
92 | { | |
93 | mutex_lock(&sessions_mutex); | |
94 | } | |
95 | ||
96 | void lttng_unlock_sessions(void) | |
97 | { | |
98 | mutex_unlock(&sessions_mutex); | |
99 | } | |
100 | ||
101 | /* | |
102 | * Called with sessions lock held. | |
103 | */ | |
104 | int lttng_session_active(void) | |
105 | { | |
106 | struct lttng_session *iter; | |
107 | ||
108 | list_for_each_entry(iter, &sessions, list) { | |
109 | if (iter->active) | |
110 | return 1; | |
111 | } | |
112 | return 0; | |
113 | } | |
114 | ||
a90917c3 | 115 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 116 | { |
a90917c3 | 117 | struct lttng_session *session; |
d83004aa | 118 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 119 | int i; |
4e3c1b9b MD |
120 | |
121 | mutex_lock(&sessions_mutex); | |
c50bdba2 MD |
122 | session = kvzalloc_node(sizeof(struct lttng_session), GFP_KERNEL, |
123 | NUMA_NO_NODE); | |
4e3c1b9b | 124 | if (!session) |
d83004aa | 125 | goto err; |
4e3c1b9b | 126 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 127 | INIT_LIST_HEAD(&session->events); |
496a7e97 | 128 | guid_gen(&session->uuid); |
d83004aa JD |
129 | |
130 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
131 | GFP_KERNEL); | |
132 | if (!metadata_cache) | |
133 | goto err_free_session; | |
0ca42eb7 | 134 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
135 | if (!metadata_cache->data) |
136 | goto err_free_cache; | |
137 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
138 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 139 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
140 | session->metadata_cache = metadata_cache; |
141 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
142 | memcpy(&metadata_cache->uuid, &session->uuid, |
143 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
144 | INIT_LIST_HEAD(&session->enablers_head); |
145 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
146 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 147 | list_add(&session->list, &sessions); |
d1f652f8 MD |
148 | session->pid_tracker.session = session; |
149 | session->pid_tracker.tracker_type = TRACKER_PID; | |
150 | session->vpid_tracker.session = session; | |
151 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
152 | session->uid_tracker.session = session; | |
153 | session->uid_tracker.tracker_type = TRACKER_UID; | |
154 | session->vuid_tracker.session = session; | |
155 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
156 | session->gid_tracker.session = session; | |
157 | session->gid_tracker.tracker_type = TRACKER_GID; | |
158 | session->vgid_tracker.session = session; | |
159 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
160 | mutex_unlock(&sessions_mutex); |
161 | return session; | |
d83004aa JD |
162 | |
163 | err_free_cache: | |
164 | kfree(metadata_cache); | |
165 | err_free_session: | |
c50bdba2 | 166 | kvfree(session); |
d83004aa JD |
167 | err: |
168 | mutex_unlock(&sessions_mutex); | |
169 | return NULL; | |
170 | } | |
171 | ||
172 | void metadata_cache_destroy(struct kref *kref) | |
173 | { | |
174 | struct lttng_metadata_cache *cache = | |
175 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 176 | vfree(cache->data); |
d83004aa | 177 | kfree(cache); |
4e3c1b9b MD |
178 | } |
179 | ||
a90917c3 | 180 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 181 | { |
a90917c3 MD |
182 | struct lttng_channel *chan, *tmpchan; |
183 | struct lttng_event *event, *tmpevent; | |
d83004aa | 184 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 185 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 186 | int ret; |
4e3c1b9b MD |
187 | |
188 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 189 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
190 | list_for_each_entry(chan, &session->chan, list) { |
191 | ret = lttng_syscalls_unregister(chan); | |
192 | WARN_ON(ret); | |
193 | } | |
dda6a249 | 194 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 195 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
196 | WARN_ON(ret); |
197 | } | |
abcca994 | 198 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
199 | list_for_each_entry_safe(enabler, tmpenabler, |
200 | &session->enablers_head, node) | |
201 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 202 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 203 | _lttng_event_destroy(event); |
d83004aa JD |
204 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
205 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 206 | _lttng_channel_destroy(chan); |
d83004aa JD |
207 | } |
208 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
209 | _lttng_metadata_channel_hangup(metadata_stream); | |
d1f652f8 MD |
210 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
211 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
212 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
213 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
214 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
215 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 216 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
217 | list_del(&session->list); |
218 | mutex_unlock(&sessions_mutex); | |
c50bdba2 | 219 | kvfree(session); |
4e3c1b9b MD |
220 | } |
221 | ||
601252cf MD |
222 | int lttng_session_statedump(struct lttng_session *session) |
223 | { | |
224 | int ret; | |
225 | ||
226 | mutex_lock(&sessions_mutex); | |
227 | ret = lttng_statedump_start(session); | |
228 | mutex_unlock(&sessions_mutex); | |
229 | return ret; | |
230 | } | |
231 | ||
a90917c3 | 232 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
233 | { |
234 | int ret = 0; | |
a90917c3 | 235 | struct lttng_channel *chan; |
c0e31d2e MD |
236 | |
237 | mutex_lock(&sessions_mutex); | |
238 | if (session->active) { | |
239 | ret = -EBUSY; | |
240 | goto end; | |
241 | } | |
c099397a | 242 | |
3c997079 MD |
243 | /* Set transient enabler state to "enabled" */ |
244 | session->tstate = 1; | |
245 | ||
4ef81e4a MD |
246 | /* We need to sync enablers with session before activation. */ |
247 | lttng_session_sync_enablers(session); | |
248 | ||
c099397a MD |
249 | /* |
250 | * Snapshot the number of events per channel to know the type of header | |
251 | * we need to use. | |
252 | */ | |
253 | list_for_each_entry(chan, &session->chan, list) { | |
254 | if (chan->header_type) | |
255 | continue; /* don't change it if session stop/restart */ | |
256 | if (chan->free_event_id < 31) | |
257 | chan->header_type = 1; /* compact */ | |
258 | else | |
259 | chan->header_type = 2; /* large */ | |
260 | } | |
261 | ||
64af2437 | 262 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
263 | list_for_each_entry(chan, &session->chan, list) { |
264 | if (chan->channel_type != METADATA_CHANNEL) | |
265 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
266 | } | |
64af2437 | 267 | |
a8f2d0c7 MJ |
268 | WRITE_ONCE(session->active, 1); |
269 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 270 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 271 | if (ret) { |
a8f2d0c7 | 272 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
273 | goto end; |
274 | } | |
275 | ret = lttng_statedump_start(session); | |
360f38ea | 276 | if (ret) |
a8f2d0c7 | 277 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
278 | end: |
279 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 280 | return ret; |
c0e31d2e MD |
281 | } |
282 | ||
a90917c3 | 283 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
284 | { |
285 | int ret = 0; | |
64af2437 | 286 | struct lttng_channel *chan; |
c0e31d2e MD |
287 | |
288 | mutex_lock(&sessions_mutex); | |
289 | if (!session->active) { | |
290 | ret = -EBUSY; | |
291 | goto end; | |
292 | } | |
a8f2d0c7 | 293 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
294 | |
295 | /* Set transient enabler state to "disabled" */ | |
296 | session->tstate = 0; | |
297 | lttng_session_sync_enablers(session); | |
64af2437 MD |
298 | |
299 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
300 | list_for_each_entry(chan, &session->chan, list) { |
301 | if (chan->channel_type != METADATA_CHANNEL) | |
302 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
303 | } | |
c0e31d2e MD |
304 | end: |
305 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 306 | return ret; |
c0e31d2e MD |
307 | } |
308 | ||
9616f0bf JD |
309 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
310 | { | |
311 | int ret = 0; | |
312 | struct lttng_channel *chan; | |
313 | struct lttng_event *event; | |
314 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
315 | struct lttng_metadata_stream *stream; | |
316 | ||
317 | mutex_lock(&sessions_mutex); | |
318 | if (!session->active) { | |
319 | ret = -EBUSY; | |
320 | goto end; | |
321 | } | |
322 | ||
323 | mutex_lock(&cache->lock); | |
324 | memset(cache->data, 0, cache->cache_alloc); | |
325 | cache->metadata_written = 0; | |
326 | cache->version++; | |
327 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
328 | stream->metadata_out = 0; | |
329 | stream->metadata_in = 0; | |
330 | } | |
331 | mutex_unlock(&cache->lock); | |
332 | ||
333 | session->metadata_dumped = 0; | |
334 | list_for_each_entry(chan, &session->chan, list) { | |
335 | chan->metadata_dumped = 0; | |
336 | } | |
337 | ||
338 | list_for_each_entry(event, &session->events, list) { | |
339 | event->metadata_dumped = 0; | |
340 | } | |
341 | ||
342 | ret = _lttng_session_metadata_statedump(session); | |
343 | ||
344 | end: | |
345 | mutex_unlock(&sessions_mutex); | |
346 | return ret; | |
347 | } | |
348 | ||
a90917c3 | 349 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 350 | { |
3c997079 | 351 | int ret = 0; |
e64957da | 352 | |
3c997079 MD |
353 | mutex_lock(&sessions_mutex); |
354 | if (channel->channel_type == METADATA_CHANNEL) { | |
355 | ret = -EPERM; | |
356 | goto end; | |
357 | } | |
358 | if (channel->enabled) { | |
359 | ret = -EEXIST; | |
360 | goto end; | |
361 | } | |
362 | /* Set transient enabler state to "enabled" */ | |
363 | channel->tstate = 1; | |
364 | lttng_session_sync_enablers(channel->session); | |
365 | /* Set atomically the state to "enabled" */ | |
a8f2d0c7 | 366 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
367 | end: |
368 | mutex_unlock(&sessions_mutex); | |
369 | return ret; | |
e64957da MD |
370 | } |
371 | ||
a90917c3 | 372 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 373 | { |
3c997079 | 374 | int ret = 0; |
e64957da | 375 | |
3c997079 MD |
376 | mutex_lock(&sessions_mutex); |
377 | if (channel->channel_type == METADATA_CHANNEL) { | |
378 | ret = -EPERM; | |
379 | goto end; | |
380 | } | |
381 | if (!channel->enabled) { | |
382 | ret = -EEXIST; | |
383 | goto end; | |
384 | } | |
385 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 386 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
387 | /* Set transient enabler state to "enabled" */ |
388 | channel->tstate = 0; | |
389 | lttng_session_sync_enablers(channel->session); | |
390 | end: | |
391 | mutex_unlock(&sessions_mutex); | |
392 | return ret; | |
e64957da MD |
393 | } |
394 | ||
a90917c3 | 395 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 396 | { |
3c997079 | 397 | int ret = 0; |
e64957da | 398 | |
3c997079 MD |
399 | mutex_lock(&sessions_mutex); |
400 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
401 | ret = -EPERM; | |
402 | goto end; | |
403 | } | |
404 | if (event->enabled) { | |
405 | ret = -EEXIST; | |
406 | goto end; | |
407 | } | |
a0493bef MD |
408 | switch (event->instrumentation) { |
409 | case LTTNG_KERNEL_TRACEPOINT: | |
410 | case LTTNG_KERNEL_SYSCALL: | |
411 | ret = -EINVAL; | |
412 | break; | |
413 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 414 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 415 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 416 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
417 | break; |
418 | case LTTNG_KERNEL_KRETPROBE: | |
419 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
420 | break; | |
e884017c | 421 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
422 | default: |
423 | WARN_ON_ONCE(1); | |
424 | ret = -EINVAL; | |
425 | } | |
3c997079 MD |
426 | end: |
427 | mutex_unlock(&sessions_mutex); | |
428 | return ret; | |
e64957da MD |
429 | } |
430 | ||
a90917c3 | 431 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 432 | { |
3c997079 | 433 | int ret = 0; |
e64957da | 434 | |
3c997079 MD |
435 | mutex_lock(&sessions_mutex); |
436 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
437 | ret = -EPERM; | |
438 | goto end; | |
439 | } | |
440 | if (!event->enabled) { | |
441 | ret = -EEXIST; | |
442 | goto end; | |
443 | } | |
a0493bef MD |
444 | switch (event->instrumentation) { |
445 | case LTTNG_KERNEL_TRACEPOINT: | |
446 | case LTTNG_KERNEL_SYSCALL: | |
447 | ret = -EINVAL; | |
448 | break; | |
449 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 450 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 451 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 452 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
453 | break; |
454 | case LTTNG_KERNEL_KRETPROBE: | |
455 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
456 | break; | |
e884017c | 457 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
458 | default: |
459 | WARN_ON_ONCE(1); | |
460 | ret = -EINVAL; | |
461 | } | |
3c997079 MD |
462 | end: |
463 | mutex_unlock(&sessions_mutex); | |
464 | return ret; | |
e64957da MD |
465 | } |
466 | ||
a90917c3 | 467 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 468 | { |
a90917c3 | 469 | struct lttng_transport *transport; |
f3d01b96 | 470 | |
a90917c3 | 471 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
472 | if (!strcmp(transport->name, name)) |
473 | return transport; | |
474 | } | |
475 | return NULL; | |
476 | } | |
477 | ||
a90917c3 | 478 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
479 | const char *transport_name, |
480 | void *buf_addr, | |
4e3c1b9b MD |
481 | size_t subbuf_size, size_t num_subbuf, |
482 | unsigned int switch_timer_interval, | |
d83004aa JD |
483 | unsigned int read_timer_interval, |
484 | enum channel_type channel_type) | |
4e3c1b9b | 485 | { |
a90917c3 MD |
486 | struct lttng_channel *chan; |
487 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
488 | |
489 | mutex_lock(&sessions_mutex); | |
d83004aa | 490 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 491 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 492 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
493 | if (!transport) { |
494 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
495 | transport_name); | |
c0e31d2e | 496 | goto notransport; |
f3d01b96 | 497 | } |
a33c9927 MD |
498 | if (!try_module_get(transport->owner)) { |
499 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
500 | goto notransport; | |
501 | } | |
a90917c3 | 502 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 503 | if (!chan) |
c0e31d2e | 504 | goto nomem; |
4e3c1b9b | 505 | chan->session = session; |
05d32c64 | 506 | chan->id = session->free_chan_id++; |
3b731ab1 | 507 | chan->ops = &transport->ops; |
125b4df4 MD |
508 | /* |
509 | * Note: the channel creation op already writes into the packet | |
510 | * headers. Therefore the "chan" information used as input | |
511 | * should be already accessible. | |
512 | */ | |
5f5ddf01 MD |
513 | chan->chan = transport->ops.channel_create(transport_name, |
514 | chan, buf_addr, subbuf_size, num_subbuf, | |
515 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
516 | if (!chan->chan) |
517 | goto create_error; | |
3c997079 | 518 | chan->tstate = 1; |
e64957da | 519 | chan->enabled = 1; |
a33c9927 | 520 | chan->transport = transport; |
d83004aa | 521 | chan->channel_type = channel_type; |
4e3c1b9b MD |
522 | list_add(&chan->list, &session->chan); |
523 | mutex_unlock(&sessions_mutex); | |
524 | return chan; | |
525 | ||
f3d01b96 MD |
526 | create_error: |
527 | kfree(chan); | |
c0e31d2e | 528 | nomem: |
a33c9927 MD |
529 | if (transport) |
530 | module_put(transport->owner); | |
c0e31d2e | 531 | notransport: |
e5382b6d | 532 | active: |
4e3c1b9b MD |
533 | mutex_unlock(&sessions_mutex); |
534 | return NULL; | |
535 | } | |
536 | ||
537 | /* | |
d83004aa JD |
538 | * Only used internally at session destruction for per-cpu channels, and |
539 | * when metadata channel is released. | |
540 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 541 | */ |
aa7c23a9 | 542 | static |
a90917c3 | 543 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 544 | { |
11b5a3c2 | 545 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 546 | module_put(chan->transport->owner); |
4e3c1b9b | 547 | list_del(&chan->list); |
8070f5c0 | 548 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
549 | kfree(chan); |
550 | } | |
551 | ||
d83004aa JD |
552 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
553 | { | |
554 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
555 | ||
556 | /* Protect the metadata cache with the sessions_mutex. */ | |
557 | mutex_lock(&sessions_mutex); | |
558 | _lttng_channel_destroy(chan); | |
559 | mutex_unlock(&sessions_mutex); | |
560 | } | |
561 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
562 | ||
563 | static | |
564 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
565 | { | |
566 | stream->finalized = 1; | |
567 | wake_up_interruptible(&stream->read_wait); | |
568 | } | |
569 | ||
e5382b6d MD |
570 | /* |
571 | * Supports event creation while tracing session is active. | |
3c997079 | 572 | * Needs to be called with sessions mutex held. |
e5382b6d | 573 | */ |
3c997079 MD |
574 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
575 | struct lttng_kernel_event *event_param, | |
576 | void *filter, | |
577 | const struct lttng_event_desc *event_desc, | |
578 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 579 | { |
3c997079 | 580 | struct lttng_session *session = chan->session; |
a90917c3 | 581 | struct lttng_event *event; |
3c997079 MD |
582 | const char *event_name; |
583 | struct hlist_head *head; | |
584 | size_t name_len; | |
585 | uint32_t hash; | |
3d084699 | 586 | int ret; |
4e3c1b9b | 587 | |
abc0446a | 588 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 589 | ret = -EMFILE; |
e5382b6d | 590 | goto full; |
abc0446a | 591 | } |
3c997079 MD |
592 | |
593 | switch (itype) { | |
594 | case LTTNG_KERNEL_TRACEPOINT: | |
595 | event_name = event_desc->name; | |
596 | break; | |
597 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 598 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 599 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 600 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 601 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
602 | event_name = event_param->name; |
603 | break; | |
e884017c | 604 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
605 | default: |
606 | WARN_ON_ONCE(1); | |
607 | ret = -EINVAL; | |
608 | goto type_error; | |
609 | } | |
610 | name_len = strlen(event_name); | |
611 | hash = jhash(event_name, name_len, 0); | |
612 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
3bc8535a | 613 | hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
614 | WARN_ON_ONCE(!event->desc); |
615 | if (!strncmp(event->desc->name, event_name, | |
616 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
617 | && chan == event->chan) { | |
618 | ret = -EEXIST; | |
619 | goto exist; | |
abc0446a MD |
620 | } |
621 | } | |
3c997079 | 622 | |
11b5a3c2 | 623 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 624 | if (!event) { |
4cf0bf51 | 625 | ret = -ENOMEM; |
4e3c1b9b | 626 | goto cache_error; |
abc0446a | 627 | } |
4e3c1b9b MD |
628 | event->chan = chan; |
629 | event->filter = filter; | |
e5382b6d | 630 | event->id = chan->free_event_id++; |
3c997079 MD |
631 | event->instrumentation = itype; |
632 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 633 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
634 | INIT_LIST_HEAD(&event->enablers_ref_head); |
635 | ||
636 | switch (itype) { | |
ab2277d6 | 637 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
638 | /* Event will be enabled by enabler sync. */ |
639 | event->enabled = 0; | |
640 | event->registered = 0; | |
641 | event->desc = lttng_event_get(event_name); | |
abc0446a | 642 | if (!event->desc) { |
4cf0bf51 | 643 | ret = -ENOENT; |
d3dbe23c | 644 | goto register_error; |
abc0446a | 645 | } |
3c997079 MD |
646 | /* Populate lttng_event structure before event registration. */ |
647 | smp_wmb(); | |
baf20995 | 648 | break; |
ab2277d6 | 649 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
650 | /* |
651 | * Needs to be explicitly enabled after creation, since | |
652 | * we may want to apply filters. | |
653 | */ | |
654 | event->enabled = 0; | |
3c997079 MD |
655 | event->registered = 1; |
656 | /* | |
657 | * Populate lttng_event structure before event | |
658 | * registration. | |
659 | */ | |
660 | smp_wmb(); | |
661 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
662 | event_param->u.kprobe.symbol_name, |
663 | event_param->u.kprobe.offset, | |
664 | event_param->u.kprobe.addr, | |
665 | event); | |
abc0446a | 666 | if (ret) { |
4cf0bf51 | 667 | ret = -EINVAL; |
d6d808f3 | 668 | goto register_error; |
abc0446a | 669 | } |
edeb3137 MD |
670 | ret = try_module_get(event->desc->owner); |
671 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 672 | break; |
7371f44c MD |
673 | case LTTNG_KERNEL_KRETPROBE: |
674 | { | |
a90917c3 | 675 | struct lttng_event *event_return; |
7371f44c MD |
676 | |
677 | /* kretprobe defines 2 events */ | |
a0493bef MD |
678 | /* |
679 | * Needs to be explicitly enabled after creation, since | |
680 | * we may want to apply filters. | |
681 | */ | |
682 | event->enabled = 0; | |
3c997079 | 683 | event->registered = 1; |
7371f44c MD |
684 | event_return = |
685 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 686 | if (!event_return) { |
4cf0bf51 | 687 | ret = -ENOMEM; |
7371f44c | 688 | goto register_error; |
abc0446a | 689 | } |
7371f44c MD |
690 | event_return->chan = chan; |
691 | event_return->filter = filter; | |
692 | event_return->id = chan->free_event_id++; | |
a0493bef | 693 | event_return->enabled = 0; |
3c997079 MD |
694 | event_return->registered = 1; |
695 | event_return->instrumentation = itype; | |
7371f44c | 696 | /* |
a90917c3 | 697 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
698 | */ |
699 | smp_wmb(); | |
3c997079 | 700 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
701 | event_param->u.kretprobe.symbol_name, |
702 | event_param->u.kretprobe.offset, | |
703 | event_param->u.kretprobe.addr, | |
704 | event, event_return); | |
705 | if (ret) { | |
706 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 707 | ret = -EINVAL; |
7371f44c MD |
708 | goto register_error; |
709 | } | |
710 | /* Take 2 refs on the module: one per event. */ | |
711 | ret = try_module_get(event->desc->owner); | |
712 | WARN_ON_ONCE(!ret); | |
713 | ret = try_module_get(event->desc->owner); | |
714 | WARN_ON_ONCE(!ret); | |
a90917c3 | 715 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 716 | event_return); |
abc0446a | 717 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
718 | if (ret) { |
719 | kmem_cache_free(event_cache, event_return); | |
720 | module_put(event->desc->owner); | |
721 | module_put(event->desc->owner); | |
722 | goto statedump_error; | |
723 | } | |
724 | list_add(&event_return->list, &chan->session->events); | |
725 | break; | |
726 | } | |
1ec65de1 | 727 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 728 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
729 | /* |
730 | * Needs to be explicitly enabled after creation, since | |
731 | * we may want to apply filters. | |
732 | */ | |
733 | event->enabled = 0; | |
3c997079 MD |
734 | event->registered = 0; |
735 | event->desc = event_desc; | |
abc0446a | 736 | if (!event->desc) { |
4cf0bf51 | 737 | ret = -EINVAL; |
259b6cb3 | 738 | goto register_error; |
abc0446a | 739 | } |
1ec65de1 | 740 | break; |
149b9a9d | 741 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
742 | /* |
743 | * Needs to be explicitly enabled after creation, since | |
744 | * we may want to apply filters. | |
745 | */ | |
746 | event->enabled = 0; | |
747 | event->registered = 1; | |
3aed4dca | 748 | |
a344f64b FD |
749 | /* |
750 | * Populate lttng_event structure before event | |
751 | * registration. | |
752 | */ | |
753 | smp_wmb(); | |
149b9a9d YB |
754 | |
755 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 756 | event_param->u.uprobe.fd, |
149b9a9d YB |
757 | event); |
758 | if (ret) | |
759 | goto register_error; | |
760 | ret = try_module_get(event->desc->owner); | |
761 | WARN_ON_ONCE(!ret); | |
762 | break; | |
e884017c | 763 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
764 | default: |
765 | WARN_ON_ONCE(1); | |
4cf0bf51 | 766 | ret = -EINVAL; |
df07930b | 767 | goto register_error; |
baf20995 | 768 | } |
a90917c3 | 769 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
770 | WARN_ON_ONCE(ret > 0); |
771 | if (ret) { | |
c099397a | 772 | goto statedump_error; |
abc0446a | 773 | } |
3c997079 | 774 | hlist_add_head(&event->hlist, head); |
dda6a249 | 775 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
776 | return event; |
777 | ||
c099397a | 778 | statedump_error: |
259b6cb3 | 779 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 780 | register_error: |
11b5a3c2 | 781 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
782 | cache_error: |
783 | exist: | |
3c997079 | 784 | type_error: |
e5382b6d | 785 | full: |
4cf0bf51 | 786 | return ERR_PTR(ret); |
4e3c1b9b MD |
787 | } |
788 | ||
3c997079 MD |
789 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
790 | struct lttng_kernel_event *event_param, | |
791 | void *filter, | |
792 | const struct lttng_event_desc *event_desc, | |
793 | enum lttng_kernel_instrumentation itype) | |
794 | { | |
795 | struct lttng_event *event; | |
796 | ||
797 | mutex_lock(&sessions_mutex); | |
798 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
799 | itype); | |
800 | mutex_unlock(&sessions_mutex); | |
801 | return event; | |
802 | } | |
803 | ||
804 | /* Only used for tracepoints for now. */ | |
805 | static | |
806 | void register_event(struct lttng_event *event) | |
807 | { | |
808 | const struct lttng_event_desc *desc; | |
f127e61e | 809 | int ret = -EINVAL; |
3c997079 | 810 | |
3c997079 MD |
811 | if (event->registered) |
812 | return; | |
4ecb5ad5 | 813 | |
3c997079 | 814 | desc = event->desc; |
4ecb5ad5 MD |
815 | switch (event->instrumentation) { |
816 | case LTTNG_KERNEL_TRACEPOINT: | |
0d260d3d MD |
817 | ret = lttng_tracepoint_probe_register(desc->kname, |
818 | desc->probe_callback, | |
819 | event); | |
4ecb5ad5 MD |
820 | break; |
821 | case LTTNG_KERNEL_SYSCALL: | |
822 | ret = lttng_syscall_filter_enable(event->chan, | |
823 | desc->name); | |
824 | break; | |
825 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 826 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 827 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
828 | case LTTNG_KERNEL_NOOP: |
829 | ret = 0; | |
830 | break; | |
e884017c | 831 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
832 | default: |
833 | WARN_ON_ONCE(1); | |
834 | } | |
3c997079 MD |
835 | if (!ret) |
836 | event->registered = 1; | |
837 | } | |
838 | ||
4e3c1b9b MD |
839 | /* |
840 | * Only used internally at session destruction. | |
841 | */ | |
a90917c3 | 842 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 843 | { |
4ecb5ad5 | 844 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
845 | int ret = -EINVAL; |
846 | ||
3c997079 MD |
847 | if (!event->registered) |
848 | return 0; | |
849 | ||
4ecb5ad5 | 850 | desc = event->desc; |
38d024ae | 851 | switch (event->instrumentation) { |
ab2277d6 | 852 | case LTTNG_KERNEL_TRACEPOINT: |
0d260d3d | 853 | ret = lttng_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 854 | event->desc->probe_callback, |
11b5a3c2 | 855 | event); |
baf20995 | 856 | break; |
ab2277d6 | 857 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 858 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
859 | ret = 0; |
860 | break; | |
7371f44c MD |
861 | case LTTNG_KERNEL_KRETPROBE: |
862 | lttng_kretprobes_unregister(event); | |
863 | ret = 0; | |
864 | break; | |
33a39a3c | 865 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
866 | ret = lttng_syscall_filter_disable(event->chan, |
867 | desc->name); | |
868 | break; | |
869 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
870 | ret = 0; |
871 | break; | |
149b9a9d YB |
872 | case LTTNG_KERNEL_UPROBE: |
873 | lttng_uprobes_unregister(event); | |
874 | ret = 0; | |
875 | break; | |
e884017c | 876 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
877 | default: |
878 | WARN_ON_ONCE(1); | |
879 | } | |
3c997079 MD |
880 | if (!ret) |
881 | event->registered = 0; | |
dda6a249 MD |
882 | return ret; |
883 | } | |
884 | ||
885 | /* | |
886 | * Only used internally at session destruction. | |
887 | */ | |
be066e6c | 888 | static |
a90917c3 | 889 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 890 | { |
edeb3137 MD |
891 | switch (event->instrumentation) { |
892 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 893 | lttng_event_put(event->desc); |
edeb3137 MD |
894 | break; |
895 | case LTTNG_KERNEL_KPROBE: | |
896 | module_put(event->desc->owner); | |
897 | lttng_kprobes_destroy_private(event); | |
898 | break; | |
7371f44c MD |
899 | case LTTNG_KERNEL_KRETPROBE: |
900 | module_put(event->desc->owner); | |
901 | lttng_kretprobes_destroy_private(event); | |
902 | break; | |
259b6cb3 | 903 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 904 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 905 | break; |
149b9a9d YB |
906 | case LTTNG_KERNEL_UPROBE: |
907 | module_put(event->desc->owner); | |
908 | lttng_uprobes_destroy_private(event); | |
909 | break; | |
e884017c | 910 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
911 | default: |
912 | WARN_ON_ONCE(1); | |
913 | } | |
dda6a249 | 914 | list_del(&event->list); |
8070f5c0 | 915 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 916 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
917 | } |
918 | ||
d1f652f8 MD |
919 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
920 | enum tracker_type tracker_type) | |
e0130fab | 921 | { |
d1f652f8 MD |
922 | switch (tracker_type) { |
923 | case TRACKER_PID: | |
924 | return &session->pid_tracker; | |
925 | case TRACKER_VPID: | |
926 | return &session->vpid_tracker; | |
927 | case TRACKER_UID: | |
928 | return &session->uid_tracker; | |
929 | case TRACKER_VUID: | |
930 | return &session->vuid_tracker; | |
931 | case TRACKER_GID: | |
932 | return &session->gid_tracker; | |
933 | case TRACKER_VGID: | |
934 | return &session->vgid_tracker; | |
935 | default: | |
936 | WARN_ON_ONCE(1); | |
937 | return NULL; | |
938 | } | |
939 | } | |
940 | ||
941 | int lttng_session_track_id(struct lttng_session *session, | |
942 | enum tracker_type tracker_type, int id) | |
943 | { | |
944 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
945 | int ret; |
946 | ||
d1f652f8 MD |
947 | tracker = get_tracker(session, tracker_type); |
948 | if (!tracker) | |
949 | return -EINVAL; | |
950 | if (id < -1) | |
e0130fab MD |
951 | return -EINVAL; |
952 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
953 | if (id == -1) { |
954 | /* track all ids: destroy tracker. */ | |
955 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
956 | ret = 0; |
957 | } else { | |
d1f652f8 | 958 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 959 | } |
e0130fab MD |
960 | mutex_unlock(&sessions_mutex); |
961 | return ret; | |
962 | } | |
963 | ||
d1f652f8 MD |
964 | int lttng_session_untrack_id(struct lttng_session *session, |
965 | enum tracker_type tracker_type, int id) | |
e0130fab | 966 | { |
d1f652f8 | 967 | struct lttng_id_tracker *tracker; |
e0130fab MD |
968 | int ret; |
969 | ||
d1f652f8 MD |
970 | tracker = get_tracker(session, tracker_type); |
971 | if (!tracker) | |
972 | return -EINVAL; | |
973 | if (id < -1) | |
e0130fab MD |
974 | return -EINVAL; |
975 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
976 | if (id == -1) { |
977 | /* untrack all ids: replace by empty tracker. */ | |
978 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 979 | } else { |
d1f652f8 | 980 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 981 | } |
e0130fab MD |
982 | mutex_unlock(&sessions_mutex); |
983 | return ret; | |
984 | } | |
985 | ||
7e6f9ef6 | 986 | static |
d1f652f8 | 987 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 988 | { |
d1f652f8 MD |
989 | struct lttng_id_tracker *id_tracker = m->private; |
990 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
991 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
992 | int iter = 0, i; |
993 | ||
994 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
995 | if (id_tracker_p) { |
996 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
997 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 998 | |
3bc8535a | 999 | hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1000 | if (iter++ >= *pos) |
1001 | return e; | |
1002 | } | |
1003 | } | |
1004 | } else { | |
d1f652f8 | 1005 | /* ID tracker disabled. */ |
7e6f9ef6 | 1006 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 1007 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
1008 | } |
1009 | iter++; | |
1010 | } | |
1011 | /* End of list */ | |
1012 | return NULL; | |
1013 | } | |
1014 | ||
1015 | /* Called with sessions_mutex held. */ | |
1016 | static | |
d1f652f8 | 1017 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1018 | { |
d1f652f8 MD |
1019 | struct lttng_id_tracker *id_tracker = m->private; |
1020 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1021 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1022 | int iter = 0, i; |
1023 | ||
1024 | (*ppos)++; | |
d1f652f8 MD |
1025 | if (id_tracker_p) { |
1026 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1027 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1028 | |
3bc8535a | 1029 | hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1030 | if (iter++ >= *ppos) |
1031 | return e; | |
1032 | } | |
1033 | } | |
1034 | } else { | |
d1f652f8 | 1035 | /* ID tracker disabled. */ |
7e6f9ef6 | 1036 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1037 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1038 | iter++; |
1039 | } | |
1040 | ||
1041 | /* End of list */ | |
1042 | return NULL; | |
1043 | } | |
1044 | ||
1045 | static | |
d1f652f8 | 1046 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1047 | { |
1048 | mutex_unlock(&sessions_mutex); | |
1049 | } | |
1050 | ||
1051 | static | |
d1f652f8 | 1052 | int id_list_show(struct seq_file *m, void *p) |
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 | int id; | |
7e6f9ef6 | 1057 | |
d1f652f8 | 1058 | if (p == id_tracker_p) { |
7e6f9ef6 | 1059 | /* Tracker disabled. */ |
d1f652f8 | 1060 | id = -1; |
7e6f9ef6 | 1061 | } else { |
d1f652f8 | 1062 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1063 | |
d1f652f8 MD |
1064 | id = lttng_id_tracker_get_node_id(e); |
1065 | } | |
1066 | switch (id_tracker->tracker_type) { | |
1067 | case TRACKER_PID: | |
1068 | seq_printf(m, "process { pid = %d; };\n", id); | |
1069 | break; | |
1070 | case TRACKER_VPID: | |
1071 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1072 | break; | |
1073 | case TRACKER_UID: | |
1074 | seq_printf(m, "user { uid = %d; };\n", id); | |
1075 | break; | |
1076 | case TRACKER_VUID: | |
1077 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1078 | break; | |
1079 | case TRACKER_GID: | |
1080 | seq_printf(m, "group { gid = %d; };\n", id); | |
1081 | break; | |
1082 | case TRACKER_VGID: | |
1083 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1084 | break; | |
1085 | default: | |
1086 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1087 | } |
7e6f9ef6 MD |
1088 | return 0; |
1089 | } | |
1090 | ||
1091 | static | |
d1f652f8 MD |
1092 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1093 | .start = id_list_start, | |
1094 | .next = id_list_next, | |
1095 | .stop = id_list_stop, | |
1096 | .show = id_list_show, | |
7e6f9ef6 MD |
1097 | }; |
1098 | ||
1099 | static | |
d1f652f8 | 1100 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1101 | { |
d1f652f8 | 1102 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1103 | } |
1104 | ||
1105 | static | |
d1f652f8 | 1106 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1107 | { |
1108 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1109 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1110 | int ret; |
1111 | ||
d1f652f8 | 1112 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1113 | ret = seq_release(inode, file); |
d1f652f8 MD |
1114 | if (!ret) |
1115 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1116 | return ret; |
1117 | } | |
1118 | ||
d1f652f8 | 1119 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1120 | .owner = THIS_MODULE, |
d1f652f8 | 1121 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1122 | .read = seq_read, |
1123 | .llseek = seq_lseek, | |
d1f652f8 | 1124 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1125 | }; |
1126 | ||
d1f652f8 MD |
1127 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1128 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1129 | { |
d1f652f8 | 1130 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1131 | struct seq_file *m; |
1132 | int file_fd, ret; | |
1133 | ||
34522739 | 1134 | file_fd = get_unused_fd_flags(0); |
7e6f9ef6 MD |
1135 | if (file_fd < 0) { |
1136 | ret = file_fd; | |
1137 | goto fd_error; | |
1138 | } | |
1139 | ||
d1f652f8 MD |
1140 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1141 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1142 | NULL, O_RDWR); |
d1f652f8 MD |
1143 | if (IS_ERR(tracker_ids_list_file)) { |
1144 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1145 | goto file_error; |
1146 | } | |
98d7281c MJ |
1147 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1148 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1149 | goto refcount_error; |
1150 | } | |
d1f652f8 | 1151 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1152 | if (ret < 0) |
1153 | goto open_error; | |
d1f652f8 MD |
1154 | m = tracker_ids_list_file->private_data; |
1155 | ||
1156 | m->private = get_tracker(session, tracker_type); | |
1157 | BUG_ON(!m->private); | |
1158 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1159 | |
1160 | return file_fd; | |
1161 | ||
1162 | open_error: | |
9c1f4643 MD |
1163 | atomic_long_dec(&session->file->f_count); |
1164 | refcount_error: | |
d1f652f8 | 1165 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1166 | file_error: |
1167 | put_unused_fd(file_fd); | |
1168 | fd_error: | |
1169 | return ret; | |
1170 | } | |
1171 | ||
3c997079 MD |
1172 | /* |
1173 | * Enabler management. | |
1174 | */ | |
1175 | static | |
4993071a PP |
1176 | int lttng_match_enabler_star_glob(const char *desc_name, |
1177 | const char *pattern) | |
3c997079 | 1178 | { |
48ccd619 MD |
1179 | if (!strutils_star_glob_match(pattern, SIZE_MAX, |
1180 | desc_name, SIZE_MAX)) | |
3c997079 MD |
1181 | return 0; |
1182 | return 1; | |
1183 | } | |
1184 | ||
1185 | static | |
4ecb5ad5 MD |
1186 | int lttng_match_enabler_name(const char *desc_name, |
1187 | const char *name) | |
3c997079 | 1188 | { |
4ecb5ad5 | 1189 | if (strcmp(desc_name, name)) |
3c997079 MD |
1190 | return 0; |
1191 | return 1; | |
1192 | } | |
1193 | ||
1194 | static | |
1195 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1196 | struct lttng_enabler *enabler) | |
1197 | { | |
4ecb5ad5 MD |
1198 | const char *desc_name, *enabler_name; |
1199 | ||
1200 | enabler_name = enabler->event_param.name; | |
1201 | switch (enabler->event_param.instrumentation) { | |
1202 | case LTTNG_KERNEL_TRACEPOINT: | |
1203 | desc_name = desc->name; | |
1204 | break; | |
1205 | case LTTNG_KERNEL_SYSCALL: | |
1206 | desc_name = desc->name; | |
1207 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1208 | desc_name += strlen("compat_"); | |
1209 | if (!strncmp(desc_name, "syscall_exit_", | |
1210 | strlen("syscall_exit_"))) { | |
1211 | desc_name += strlen("syscall_exit_"); | |
1212 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1213 | strlen("syscall_entry_"))) { | |
1214 | desc_name += strlen("syscall_entry_"); | |
1215 | } else { | |
1216 | WARN_ON_ONCE(1); | |
1217 | return -EINVAL; | |
1218 | } | |
1219 | break; | |
1220 | default: | |
1221 | WARN_ON_ONCE(1); | |
1222 | return -EINVAL; | |
1223 | } | |
3c997079 | 1224 | switch (enabler->type) { |
4993071a PP |
1225 | case LTTNG_ENABLER_STAR_GLOB: |
1226 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
3c997079 | 1227 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1228 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1229 | default: |
1230 | return -EINVAL; | |
1231 | } | |
1232 | } | |
1233 | ||
1234 | static | |
1235 | int lttng_event_match_enabler(struct lttng_event *event, | |
1236 | struct lttng_enabler *enabler) | |
1237 | { | |
33a39a3c MD |
1238 | if (enabler->event_param.instrumentation != event->instrumentation) |
1239 | return 0; | |
3c997079 MD |
1240 | if (lttng_desc_match_enabler(event->desc, enabler) |
1241 | && event->chan == enabler->chan) | |
1242 | return 1; | |
1243 | else | |
1244 | return 0; | |
1245 | } | |
1246 | ||
1247 | static | |
1248 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1249 | struct lttng_enabler *enabler) | |
1250 | { | |
1251 | struct lttng_enabler_ref *enabler_ref; | |
1252 | ||
1253 | list_for_each_entry(enabler_ref, | |
1254 | &event->enablers_ref_head, node) { | |
1255 | if (enabler_ref->ref == enabler) | |
1256 | return enabler_ref; | |
1257 | } | |
1258 | return NULL; | |
1259 | } | |
1260 | ||
3c997079 | 1261 | static |
33a39a3c | 1262 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1263 | { |
1264 | struct lttng_session *session = enabler->chan->session; | |
1265 | struct lttng_probe_desc *probe_desc; | |
1266 | const struct lttng_event_desc *desc; | |
1267 | int i; | |
1268 | struct list_head *probe_list; | |
1269 | ||
1270 | probe_list = lttng_get_probe_list_head(); | |
1271 | /* | |
1272 | * For each probe event, if we find that a probe event matches | |
1273 | * our enabler, create an associated lttng_event if not | |
1274 | * already present. | |
1275 | */ | |
1276 | list_for_each_entry(probe_desc, probe_list, head) { | |
1277 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1278 | int found = 0; | |
1279 | struct hlist_head *head; | |
1280 | const char *event_name; | |
1281 | size_t name_len; | |
1282 | uint32_t hash; | |
1283 | struct lttng_event *event; | |
1284 | ||
1285 | desc = probe_desc->event_desc[i]; | |
1286 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1287 | continue; | |
1288 | event_name = desc->name; | |
1289 | name_len = strlen(event_name); | |
1290 | ||
1291 | /* | |
1292 | * Check if already created. | |
1293 | */ | |
1294 | hash = jhash(event_name, name_len, 0); | |
1295 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
3bc8535a | 1296 | hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1297 | if (event->desc == desc |
1298 | && event->chan == enabler->chan) | |
1299 | found = 1; | |
1300 | } | |
1301 | if (found) | |
1302 | continue; | |
1303 | ||
1304 | /* | |
1305 | * We need to create an event for this | |
1306 | * event probe. | |
1307 | */ | |
1308 | event = _lttng_event_create(enabler->chan, | |
1309 | NULL, NULL, desc, | |
1310 | LTTNG_KERNEL_TRACEPOINT); | |
1311 | if (!event) { | |
1312 | printk(KERN_INFO "Unable to create event %s\n", | |
1313 | probe_desc->event_desc[i]->name); | |
1314 | } | |
1315 | } | |
1316 | } | |
1317 | } | |
1318 | ||
33a39a3c MD |
1319 | static |
1320 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1321 | { | |
1322 | int ret; | |
1323 | ||
1324 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1325 | WARN_ON_ONCE(ret); | |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * Create struct lttng_event if it is missing and present in the list of | |
1330 | * tracepoint probes. | |
1331 | * Should be called with sessions mutex held. | |
1332 | */ | |
1333 | static | |
1334 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1335 | { | |
1336 | switch (enabler->event_param.instrumentation) { | |
1337 | case LTTNG_KERNEL_TRACEPOINT: | |
1338 | lttng_create_tracepoint_if_missing(enabler); | |
1339 | break; | |
1340 | case LTTNG_KERNEL_SYSCALL: | |
1341 | lttng_create_syscall_if_missing(enabler); | |
1342 | break; | |
1343 | default: | |
1344 | WARN_ON_ONCE(1); | |
1345 | break; | |
1346 | } | |
1347 | } | |
1348 | ||
3c997079 MD |
1349 | /* |
1350 | * Create events associated with an enabler (if not already present), | |
1351 | * and add backward reference from the event to the enabler. | |
1352 | * Should be called with sessions mutex held. | |
1353 | */ | |
1354 | static | |
1355 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1356 | { | |
1357 | struct lttng_session *session = enabler->chan->session; | |
1358 | struct lttng_event *event; | |
1359 | ||
1360 | /* First ensure that probe events are created for this enabler. */ | |
1361 | lttng_create_event_if_missing(enabler); | |
1362 | ||
1363 | /* For each event matching enabler in session event list. */ | |
1364 | list_for_each_entry(event, &session->events, list) { | |
1365 | struct lttng_enabler_ref *enabler_ref; | |
1366 | ||
1367 | if (!lttng_event_match_enabler(event, enabler)) | |
1368 | continue; | |
1369 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1370 | if (!enabler_ref) { | |
1371 | /* | |
1372 | * If no backward ref, create it. | |
1373 | * Add backward ref from event to enabler. | |
1374 | */ | |
1375 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1376 | if (!enabler_ref) | |
1377 | return -ENOMEM; | |
1378 | enabler_ref->ref = enabler; | |
1379 | list_add(&enabler_ref->node, | |
1380 | &event->enablers_ref_head); | |
1381 | } | |
1382 | ||
f127e61e MD |
1383 | /* |
1384 | * Link filter bytecodes if not linked yet. | |
1385 | */ | |
1386 | lttng_enabler_event_link_bytecode(event, enabler); | |
1387 | ||
3c997079 MD |
1388 | /* TODO: merge event context. */ |
1389 | } | |
1390 | return 0; | |
1391 | } | |
1392 | ||
1393 | /* | |
1394 | * Called at module load: connect the probe on all enablers matching | |
1395 | * this event. | |
1396 | * Called with sessions lock held. | |
1397 | */ | |
1398 | int lttng_fix_pending_events(void) | |
1399 | { | |
1400 | struct lttng_session *session; | |
1401 | ||
1402 | list_for_each_entry(session, &sessions, list) | |
1403 | lttng_session_lazy_sync_enablers(session); | |
1404 | return 0; | |
1405 | } | |
1406 | ||
1407 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1408 | struct lttng_kernel_event *event_param, | |
1409 | struct lttng_channel *chan) | |
1410 | { | |
1411 | struct lttng_enabler *enabler; | |
1412 | ||
1413 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1414 | if (!enabler) | |
1415 | return NULL; | |
1416 | enabler->type = type; | |
07dfc1d0 | 1417 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1418 | memcpy(&enabler->event_param, event_param, |
1419 | sizeof(enabler->event_param)); | |
1420 | enabler->chan = chan; | |
1421 | /* ctx left NULL */ | |
4fd19d8a | 1422 | enabler->enabled = 0; |
3c997079 MD |
1423 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1424 | mutex_lock(&sessions_mutex); | |
1425 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1426 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1427 | mutex_unlock(&sessions_mutex); | |
1428 | return enabler; | |
1429 | } | |
1430 | ||
1431 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1432 | { | |
1433 | mutex_lock(&sessions_mutex); | |
1434 | enabler->enabled = 1; | |
1435 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1436 | mutex_unlock(&sessions_mutex); | |
1437 | return 0; | |
1438 | } | |
1439 | ||
1440 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1441 | { | |
1442 | mutex_lock(&sessions_mutex); | |
1443 | enabler->enabled = 0; | |
1444 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1445 | mutex_unlock(&sessions_mutex); | |
1446 | return 0; | |
1447 | } | |
1448 | ||
07dfc1d0 MD |
1449 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1450 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1451 | { | |
1452 | struct lttng_filter_bytecode_node *bytecode_node; | |
1453 | uint32_t bytecode_len; | |
1454 | int ret; | |
1455 | ||
1456 | ret = get_user(bytecode_len, &bytecode->len); | |
1457 | if (ret) | |
1458 | return ret; | |
1459 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1460 | GFP_KERNEL); | |
1461 | if (!bytecode_node) | |
1462 | return -ENOMEM; | |
1463 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1464 | sizeof(*bytecode) + bytecode_len); | |
1465 | if (ret) | |
1466 | goto error_free; | |
1467 | bytecode_node->enabler = enabler; | |
1468 | /* Enforce length based on allocated size */ | |
1469 | bytecode_node->bc.len = bytecode_len; | |
1470 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1471 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1472 | return 0; | |
1473 | ||
1474 | error_free: | |
1475 | kfree(bytecode_node); | |
1476 | return ret; | |
1477 | } | |
1478 | ||
3aed4dca FD |
1479 | int lttng_event_add_callsite(struct lttng_event *event, |
1480 | struct lttng_kernel_event_callsite __user *callsite) | |
1481 | { | |
1482 | ||
1483 | switch (event->instrumentation) { | |
1484 | case LTTNG_KERNEL_UPROBE: | |
1485 | return lttng_uprobes_add_callsite(event, callsite); | |
1486 | default: | |
1487 | return -EINVAL; | |
1488 | } | |
1489 | } | |
1490 | ||
3c997079 MD |
1491 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1492 | struct lttng_kernel_context *context_param) | |
1493 | { | |
1494 | return -ENOSYS; | |
1495 | } | |
1496 | ||
1497 | static | |
1498 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1499 | { | |
07dfc1d0 MD |
1500 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1501 | ||
1502 | /* Destroy filter bytecode */ | |
1503 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1504 | &enabler->filter_bytecode_head, node) { | |
1505 | kfree(filter_node); | |
1506 | } | |
1507 | ||
3c997079 MD |
1508 | /* Destroy contexts */ |
1509 | lttng_destroy_context(enabler->ctx); | |
1510 | ||
1511 | list_del(&enabler->node); | |
1512 | kfree(enabler); | |
1513 | } | |
1514 | ||
1515 | /* | |
1516 | * lttng_session_sync_enablers should be called just before starting a | |
1517 | * session. | |
1518 | * Should be called with sessions mutex held. | |
1519 | */ | |
1520 | static | |
1521 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1522 | { | |
1523 | struct lttng_enabler *enabler; | |
1524 | struct lttng_event *event; | |
1525 | ||
1526 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1527 | lttng_enabler_ref_events(enabler); | |
1528 | /* | |
1529 | * For each event, if at least one of its enablers is enabled, | |
1530 | * and its channel and session transient states are enabled, we | |
1531 | * enable the event, else we disable it. | |
1532 | */ | |
1533 | list_for_each_entry(event, &session->events, list) { | |
1534 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1535 | struct lttng_bytecode_runtime *runtime; |
1536 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1537 | |
4ecb5ad5 MD |
1538 | switch (event->instrumentation) { |
1539 | case LTTNG_KERNEL_TRACEPOINT: | |
1540 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1541 | /* Enable events */ |
1542 | list_for_each_entry(enabler_ref, | |
1543 | &event->enablers_ref_head, node) { | |
1544 | if (enabler_ref->ref->enabled) { | |
1545 | enabled = 1; | |
1546 | break; | |
1547 | } | |
1548 | } | |
4ecb5ad5 MD |
1549 | break; |
1550 | default: | |
3c997079 MD |
1551 | /* Not handled with lazy sync. */ |
1552 | continue; | |
1553 | } | |
1554 | /* | |
1555 | * Enabled state is based on union of enablers, with | |
1556 | * intesection of session and channel transient enable | |
1557 | * states. | |
1558 | */ | |
1559 | enabled = enabled && session->tstate && event->chan->tstate; | |
1560 | ||
a8f2d0c7 | 1561 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1562 | /* |
1563 | * Sync tracepoint registration with event enabled | |
1564 | * state. | |
1565 | */ | |
1566 | if (enabled) { | |
1567 | register_event(event); | |
1568 | } else { | |
1569 | _lttng_event_unregister(event); | |
1570 | } | |
07dfc1d0 MD |
1571 | |
1572 | /* Check if has enablers without bytecode enabled */ | |
1573 | list_for_each_entry(enabler_ref, | |
1574 | &event->enablers_ref_head, node) { | |
1575 | if (enabler_ref->ref->enabled | |
1576 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1577 | has_enablers_without_bytecode = 1; | |
1578 | break; | |
1579 | } | |
1580 | } | |
1581 | event->has_enablers_without_bytecode = | |
1582 | has_enablers_without_bytecode; | |
1583 | ||
1584 | /* Enable filters */ | |
1585 | list_for_each_entry(runtime, | |
f127e61e | 1586 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1587 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1588 | } |
1589 | } | |
1590 | ||
1591 | /* | |
1592 | * Apply enablers to session events, adding events to session if need | |
1593 | * be. It is required after each modification applied to an active | |
1594 | * session, and right before session "start". | |
1595 | * "lazy" sync means we only sync if required. | |
1596 | * Should be called with sessions mutex held. | |
1597 | */ | |
1598 | static | |
1599 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1600 | { | |
1601 | /* We can skip if session is not active */ | |
1602 | if (!session->active) | |
1603 | return; | |
1604 | lttng_session_sync_enablers(session); | |
1605 | } | |
1606 | ||
1ec3f75a | 1607 | /* |
d83004aa JD |
1608 | * Serialize at most one packet worth of metadata into a metadata |
1609 | * channel. | |
92d9f5e6 MD |
1610 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1611 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1612 | * allows us to do racy operations such as looking for remaining space left in | |
1613 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1614 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1615 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1616 | * Returns the number of bytes written in the channel, 0 if no data |
1617 | * was written and a negative value on error. | |
1ec3f75a | 1618 | */ |
b3b8072b MD |
1619 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1620 | struct channel *chan) | |
d83004aa JD |
1621 | { |
1622 | struct lib_ring_buffer_ctx ctx; | |
1623 | int ret = 0; | |
1624 | size_t len, reserve_len; | |
1625 | ||
f613e3e6 | 1626 | /* |
92d9f5e6 MD |
1627 | * Ensure we support mutiple get_next / put sequences followed by |
1628 | * put_next. The metadata cache lock protects reading the metadata | |
1629 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1630 | * "flush" operations on the buffer invoked by different processes. | |
1631 | * Moreover, since the metadata cache memory can be reallocated, we | |
1632 | * need to have exclusive access against updates even though we only | |
1633 | * read it. | |
f613e3e6 | 1634 | */ |
92d9f5e6 | 1635 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1636 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1637 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1638 | goto end; |
f613e3e6 | 1639 | |
9616f0bf JD |
1640 | /* Metadata regenerated, change the version. */ |
1641 | if (stream->metadata_cache->version != stream->version) | |
1642 | stream->version = stream->metadata_cache->version; | |
1643 | ||
d83004aa | 1644 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1645 | stream->metadata_in; |
9de2c215 | 1646 | if (!len) |
de23d59d | 1647 | goto end; |
d83004aa | 1648 | reserve_len = min_t(size_t, |
b3b8072b | 1649 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1650 | len); |
b3b8072b | 1651 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1652 | sizeof(char), -1); |
1653 | /* | |
1654 | * If reservation failed, return an error to the caller. | |
1655 | */ | |
b3b8072b | 1656 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1657 | if (ret != 0) { |
1658 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1659 | goto end; | |
1660 | } | |
b3b8072b | 1661 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1662 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1663 | reserve_len); |
b3b8072b | 1664 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1665 | stream->metadata_in += reserve_len; |
d83004aa JD |
1666 | ret = reserve_len; |
1667 | ||
1668 | end: | |
92d9f5e6 | 1669 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1670 | return ret; |
1671 | } | |
1672 | ||
1673 | /* | |
1674 | * Write the metadata to the metadata cache. | |
1675 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1676 | * The metadata cache lock protects us from concurrent read access from |
1677 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1678 | */ |
a90917c3 | 1679 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1680 | const char *fmt, ...) |
1681 | { | |
c099397a | 1682 | char *str; |
d83004aa | 1683 | size_t len; |
c099397a | 1684 | va_list ap; |
d83004aa | 1685 | struct lttng_metadata_stream *stream; |
c099397a | 1686 | |
a8f2d0c7 | 1687 | WARN_ON_ONCE(!READ_ONCE(session->active)); |
c099397a MD |
1688 | |
1689 | va_start(ap, fmt); | |
1690 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1691 | va_end(ap); | |
1692 | if (!str) | |
1693 | return -ENOMEM; | |
1694 | ||
1ec3f75a | 1695 | len = strlen(str); |
92d9f5e6 | 1696 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1697 | if (session->metadata_cache->metadata_written + len > |
1698 | session->metadata_cache->cache_alloc) { | |
1699 | char *tmp_cache_realloc; | |
1700 | unsigned int tmp_cache_alloc_size; | |
1701 | ||
1702 | tmp_cache_alloc_size = max_t(unsigned int, | |
1703 | session->metadata_cache->cache_alloc + len, | |
1704 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 1705 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1706 | if (!tmp_cache_realloc) |
1707 | goto err; | |
a606b6e8 ML |
1708 | if (session->metadata_cache->data) { |
1709 | memcpy(tmp_cache_realloc, | |
1710 | session->metadata_cache->data, | |
1711 | session->metadata_cache->cache_alloc); | |
1712 | vfree(session->metadata_cache->data); | |
1713 | } | |
1714 | ||
d83004aa JD |
1715 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1716 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1717 | } |
d83004aa JD |
1718 | memcpy(session->metadata_cache->data + |
1719 | session->metadata_cache->metadata_written, | |
1720 | str, len); | |
1721 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1722 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1723 | kfree(str); |
d83004aa JD |
1724 | |
1725 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1726 | wake_up_interruptible(&stream->read_wait); | |
1727 | ||
1728 | return 0; | |
1729 | ||
1730 | err: | |
92d9f5e6 | 1731 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1732 | kfree(str); |
1733 | return -ENOMEM; | |
c099397a MD |
1734 | } |
1735 | ||
f513b2bf MD |
1736 | static |
1737 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1738 | { | |
1739 | size_t i; | |
1740 | ||
1741 | for (i = 0; i < nesting; i++) { | |
1742 | int ret; | |
1743 | ||
1744 | ret = lttng_metadata_printf(session, " "); | |
1745 | if (ret) { | |
1746 | return ret; | |
1747 | } | |
1748 | } | |
1749 | return 0; | |
1750 | } | |
1751 | ||
ceabb767 MD |
1752 | static |
1753 | int lttng_field_name_statedump(struct lttng_session *session, | |
1754 | const struct lttng_event_field *field, | |
1755 | size_t nesting) | |
1756 | { | |
1757 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
1758 | } | |
1759 | ||
1760 | static | |
1761 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
1762 | const struct lttng_type *type, | |
1763 | size_t nesting) | |
1764 | { | |
1765 | int ret; | |
1766 | ||
1767 | WARN_ON_ONCE(type->atype != atype_integer); | |
1768 | ret = print_tabs(session, nesting); | |
1769 | if (ret) | |
1770 | return ret; | |
1771 | ret = lttng_metadata_printf(session, | |
1772 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
1773 | type->u.integer.size, | |
1774 | type->u.integer.alignment, | |
1775 | type->u.integer.signedness, | |
1776 | (type->u.integer.encoding == lttng_encode_none) | |
1777 | ? "none" | |
1778 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
1779 | ? "UTF8" | |
1780 | : "ASCII", | |
1781 | type->u.integer.base, | |
1782 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1783 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
1784 | #else | |
1785 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
1786 | #endif | |
1787 | ); | |
1788 | return ret; | |
1789 | } | |
1790 | ||
f513b2bf MD |
1791 | /* |
1792 | * Must be called with sessions_mutex held. | |
1793 | */ | |
1794 | static | |
1795 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1796 | const struct lttng_type *type, | |
1797 | size_t nesting) | |
1798 | { | |
1799 | int ret; | |
1800 | uint32_t i, nr_fields; | |
ceabb767 MD |
1801 | unsigned int alignment; |
1802 | ||
1803 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
1804 | |
1805 | ret = print_tabs(session, nesting); | |
1806 | if (ret) | |
1807 | return ret; | |
1808 | ret = lttng_metadata_printf(session, | |
1809 | "struct {\n"); | |
1810 | if (ret) | |
1811 | return ret; | |
ceabb767 | 1812 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
1813 | for (i = 0; i < nr_fields; i++) { |
1814 | const struct lttng_event_field *iter_field; | |
1815 | ||
ceabb767 | 1816 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
1817 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
1818 | if (ret) | |
1819 | return ret; | |
1820 | } | |
1821 | ret = print_tabs(session, nesting); | |
1822 | if (ret) | |
1823 | return ret; | |
ceabb767 MD |
1824 | alignment = type->u.struct_nestable.alignment; |
1825 | if (alignment) { | |
1826 | ret = lttng_metadata_printf(session, | |
1827 | "} align(%u)", | |
1828 | alignment); | |
1829 | } else { | |
1830 | ret = lttng_metadata_printf(session, | |
1831 | "}"); | |
1832 | } | |
f513b2bf MD |
1833 | return ret; |
1834 | } | |
1835 | ||
1836 | /* | |
1837 | * Must be called with sessions_mutex held. | |
1838 | */ | |
1839 | static | |
ceabb767 | 1840 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1841 | const struct lttng_event_field *field, |
1842 | size_t nesting) | |
1843 | { | |
1844 | int ret; | |
1845 | ||
1846 | ret = _lttng_struct_type_statedump(session, | |
1847 | &field->type, nesting); | |
1848 | if (ret) | |
1849 | return ret; | |
ceabb767 | 1850 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
1851 | } |
1852 | ||
65c85aa6 MD |
1853 | /* |
1854 | * Must be called with sessions_mutex held. | |
1855 | */ | |
1856 | static | |
1857 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1858 | const struct lttng_type *type, | |
1859 | size_t nesting) | |
1860 | { | |
1861 | int ret; | |
1862 | uint32_t i, nr_choices; | |
1863 | ||
ceabb767 MD |
1864 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
1865 | /* | |
1866 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
1867 | */ | |
1868 | if (type->u.variant_nestable.alignment != 0) | |
1869 | return -EINVAL; | |
65c85aa6 MD |
1870 | ret = print_tabs(session, nesting); |
1871 | if (ret) | |
1872 | return ret; | |
1873 | ret = lttng_metadata_printf(session, | |
1874 | "variant <_%s> {\n", | |
ceabb767 | 1875 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
1876 | if (ret) |
1877 | return ret; | |
ceabb767 | 1878 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
1879 | for (i = 0; i < nr_choices; i++) { |
1880 | const struct lttng_event_field *iter_field; | |
1881 | ||
ceabb767 | 1882 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
1883 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
1884 | if (ret) | |
1885 | return ret; | |
1886 | } | |
1887 | ret = print_tabs(session, nesting); | |
1888 | if (ret) | |
1889 | return ret; | |
1890 | ret = lttng_metadata_printf(session, | |
1891 | "}"); | |
1892 | return ret; | |
1893 | } | |
1894 | ||
1895 | /* | |
1896 | * Must be called with sessions_mutex held. | |
1897 | */ | |
1898 | static | |
ceabb767 | 1899 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
1900 | const struct lttng_event_field *field, |
1901 | size_t nesting) | |
1902 | { | |
1903 | int ret; | |
1904 | ||
1905 | ret = _lttng_variant_type_statedump(session, | |
1906 | &field->type, nesting); | |
1907 | if (ret) | |
1908 | return ret; | |
ceabb767 | 1909 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
1910 | } |
1911 | ||
f513b2bf MD |
1912 | /* |
1913 | * Must be called with sessions_mutex held. | |
1914 | */ | |
1915 | static | |
ceabb767 | 1916 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1917 | const struct lttng_event_field *field, |
1918 | size_t nesting) | |
1919 | { | |
1920 | int ret; | |
1921 | const struct lttng_type *elem_type; | |
1922 | ||
ceabb767 MD |
1923 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
1924 | ||
1925 | if (field->type.u.array_nestable.alignment) { | |
1926 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
1927 | if (ret) |
1928 | return ret; | |
ceabb767 MD |
1929 | ret = lttng_metadata_printf(session, |
1930 | "struct { } align(%u) _%s_padding;\n", | |
1931 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
1932 | field->name); | |
1933 | if (ret) | |
1934 | return ret; | |
1935 | } | |
1936 | /* | |
1937 | * Nested compound types: Only array of structures and variants are | |
1938 | * currently supported. | |
1939 | */ | |
1940 | elem_type = field->type.u.array_nestable.elem_type; | |
1941 | switch (elem_type->atype) { | |
1942 | case atype_integer: | |
1943 | case atype_struct_nestable: | |
1944 | case atype_variant_nestable: | |
1945 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
1946 | if (ret) |
1947 | return ret; | |
1948 | break; | |
ceabb767 | 1949 | |
f513b2bf MD |
1950 | default: |
1951 | return -EINVAL; | |
1952 | } | |
1953 | ret = lttng_metadata_printf(session, | |
1954 | " _%s[%u];\n", | |
1955 | field->name, | |
ceabb767 | 1956 | field->type.u.array_nestable.length); |
f513b2bf MD |
1957 | return ret; |
1958 | } | |
1959 | ||
1960 | /* | |
1961 | * Must be called with sessions_mutex held. | |
1962 | */ | |
1963 | static | |
ceabb767 | 1964 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1965 | const struct lttng_event_field *field, |
1966 | size_t nesting) | |
1967 | { | |
1968 | int ret; | |
1969 | const char *length_name; | |
1970 | const struct lttng_type *elem_type; | |
1971 | ||
ceabb767 | 1972 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 1973 | |
ceabb767 MD |
1974 | length_name = field->type.u.sequence_nestable.length_name; |
1975 | ||
1976 | if (field->type.u.sequence_nestable.alignment) { | |
1977 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
1978 | if (ret) |
1979 | return ret; | |
ceabb767 MD |
1980 | ret = lttng_metadata_printf(session, |
1981 | "struct { } align(%u) _%s_padding;\n", | |
1982 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
1983 | field->name); | |
1984 | if (ret) | |
1985 | return ret; | |
1986 | } | |
1987 | ||
1988 | /* | |
1989 | * Nested compound types: Only array of structures and variants are | |
1990 | * currently supported. | |
1991 | */ | |
1992 | elem_type = field->type.u.sequence_nestable.elem_type; | |
1993 | switch (elem_type->atype) { | |
1994 | case atype_integer: | |
1995 | case atype_struct_nestable: | |
1996 | case atype_variant_nestable: | |
1997 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
1998 | if (ret) |
1999 | return ret; | |
2000 | break; | |
ceabb767 | 2001 | |
f513b2bf MD |
2002 | default: |
2003 | return -EINVAL; | |
2004 | } | |
2005 | ret = lttng_metadata_printf(session, | |
2006 | " _%s[ _%s ];\n", | |
2007 | field->name, | |
ceabb767 | 2008 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
2009 | return ret; |
2010 | } | |
2011 | ||
141ddf28 MD |
2012 | /* |
2013 | * Must be called with sessions_mutex held. | |
2014 | */ | |
2015 | static | |
ceabb767 MD |
2016 | int _lttng_enum_type_statedump(struct lttng_session *session, |
2017 | const struct lttng_type *type, | |
141ddf28 MD |
2018 | size_t nesting) |
2019 | { | |
2020 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 2021 | const struct lttng_type *container_type; |
141ddf28 MD |
2022 | int ret; |
2023 | unsigned int i, nr_entries; | |
2024 | ||
ceabb767 MD |
2025 | container_type = type->u.enum_nestable.container_type; |
2026 | if (container_type->atype != atype_integer) { | |
2027 | ret = -EINVAL; | |
2028 | goto end; | |
2029 | } | |
2030 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
2031 | nr_entries = enum_desc->nr_entries; |
2032 | ||
2033 | ret = print_tabs(session, nesting); | |
2034 | if (ret) | |
2035 | goto end; | |
ceabb767 MD |
2036 | ret = lttng_metadata_printf(session, "enum : "); |
2037 | if (ret) | |
2038 | goto end; | |
2039 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 2040 | if (ret) |
ceabb767 MD |
2041 | goto end; |
2042 | ret = lttng_metadata_printf(session, " {\n"); | |
2043 | if (ret) | |
2044 | goto end; | |
141ddf28 MD |
2045 | /* Dump all entries */ |
2046 | for (i = 0; i < nr_entries; i++) { | |
2047 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2048 | int j, len; | |
2049 | ||
2050 | ret = print_tabs(session, nesting + 1); | |
2051 | if (ret) | |
2052 | goto end; | |
2053 | ret = lttng_metadata_printf(session, | |
2054 | "\""); | |
2055 | if (ret) | |
2056 | goto end; | |
2057 | len = strlen(entry->string); | |
2058 | /* Escape the character '"' */ | |
2059 | for (j = 0; j < len; j++) { | |
2060 | char c = entry->string[j]; | |
2061 | ||
2062 | switch (c) { | |
2063 | case '"': | |
2064 | ret = lttng_metadata_printf(session, | |
2065 | "\\\""); | |
2066 | break; | |
2067 | case '\\': | |
2068 | ret = lttng_metadata_printf(session, | |
2069 | "\\\\"); | |
2070 | break; | |
2071 | default: | |
2072 | ret = lttng_metadata_printf(session, | |
2073 | "%c", c); | |
2074 | break; | |
2075 | } | |
2076 | if (ret) | |
2077 | goto end; | |
2078 | } | |
08ad1061 PP |
2079 | ret = lttng_metadata_printf(session, "\""); |
2080 | if (ret) | |
2081 | goto end; | |
2082 | ||
2083 | if (entry->options.is_auto) { | |
2084 | ret = lttng_metadata_printf(session, ",\n"); | |
2085 | if (ret) | |
2086 | goto end; | |
141ddf28 | 2087 | } else { |
7c559490 MD |
2088 | ret = lttng_metadata_printf(session, |
2089 | " = "); | |
2090 | if (ret) | |
2091 | goto end; | |
2092 | if (entry->start.signedness) | |
141ddf28 | 2093 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2094 | "%lld", (long long) entry->start.value); |
2095 | else | |
2096 | ret = lttng_metadata_printf(session, | |
2097 | "%llu", entry->start.value); | |
2098 | if (ret) | |
2099 | goto end; | |
2100 | if (entry->start.signedness == entry->end.signedness && | |
2101 | entry->start.value | |
2102 | == entry->end.value) { | |
141ddf28 | 2103 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2104 | ",\n"); |
2105 | } else { | |
2106 | if (entry->end.signedness) { | |
2107 | ret = lttng_metadata_printf(session, | |
2108 | " ... %lld,\n", | |
2109 | (long long) entry->end.value); | |
2110 | } else { | |
2111 | ret = lttng_metadata_printf(session, | |
2112 | " ... %llu,\n", | |
2113 | entry->end.value); | |
2114 | } | |
141ddf28 | 2115 | } |
7c559490 MD |
2116 | if (ret) |
2117 | goto end; | |
141ddf28 | 2118 | } |
141ddf28 MD |
2119 | } |
2120 | ret = print_tabs(session, nesting); | |
2121 | if (ret) | |
2122 | goto end; | |
ceabb767 | 2123 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
2124 | end: |
2125 | return ret; | |
2126 | } | |
2127 | ||
d83004aa JD |
2128 | /* |
2129 | * Must be called with sessions_mutex held. | |
2130 | */ | |
c099397a | 2131 | static |
ceabb767 MD |
2132 | int _lttng_enum_field_statedump(struct lttng_session *session, |
2133 | const struct lttng_event_field *field, | |
2134 | size_t nesting) | |
2135 | { | |
2136 | int ret; | |
2137 | ||
2138 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
2139 | if (ret) | |
2140 | return ret; | |
2141 | return lttng_field_name_statedump(session, field, nesting); | |
2142 | } | |
2143 | ||
2144 | static | |
2145 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
2146 | const struct lttng_event_field *field, | |
2147 | size_t nesting) | |
2148 | { | |
2149 | int ret; | |
2150 | ||
2151 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
2152 | if (ret) | |
2153 | return ret; | |
2154 | return lttng_field_name_statedump(session, field, nesting); | |
2155 | } | |
2156 | ||
2157 | static | |
2158 | int _lttng_string_type_statedump(struct lttng_session *session, | |
2159 | const struct lttng_type *type, | |
2160 | size_t nesting) | |
2161 | { | |
2162 | int ret; | |
2163 | ||
2164 | WARN_ON_ONCE(type->atype != atype_string); | |
2165 | /* Default encoding is UTF8 */ | |
2166 | ret = print_tabs(session, nesting); | |
2167 | if (ret) | |
2168 | return ret; | |
2169 | ret = lttng_metadata_printf(session, | |
2170 | "string%s", | |
2171 | type->u.string.encoding == lttng_encode_ASCII ? | |
2172 | " { encoding = ASCII; }" : ""); | |
2173 | return ret; | |
2174 | } | |
2175 | ||
2176 | static | |
2177 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
2178 | const struct lttng_event_field *field, |
2179 | size_t nesting) | |
ceabb767 MD |
2180 | { |
2181 | int ret; | |
2182 | ||
2183 | WARN_ON_ONCE(field->type.atype != atype_string); | |
2184 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
2185 | if (ret) | |
2186 | return ret; | |
2187 | return lttng_field_name_statedump(session, field, nesting); | |
2188 | } | |
2189 | ||
2190 | /* | |
2191 | * Must be called with sessions_mutex held. | |
2192 | */ | |
2193 | static | |
2194 | int _lttng_type_statedump(struct lttng_session *session, | |
2195 | const struct lttng_type *type, | |
2196 | size_t nesting) | |
c099397a | 2197 | { |
c099397a | 2198 | int ret = 0; |
c099397a | 2199 | |
ceabb767 | 2200 | switch (type->atype) { |
8070f5c0 | 2201 | case atype_integer: |
ceabb767 | 2202 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 2203 | break; |
ceabb767 MD |
2204 | case atype_enum_nestable: |
2205 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 2206 | break; |
ceabb767 MD |
2207 | case atype_string: |
2208 | ret = _lttng_string_type_statedump(session, type, nesting); | |
2209 | break; | |
2210 | case atype_struct_nestable: | |
2211 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 2212 | break; |
ceabb767 MD |
2213 | case atype_variant_nestable: |
2214 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
2215 | break; | |
2216 | ||
2217 | /* Nested arrays and sequences are not supported yet. */ | |
2218 | case atype_array_nestable: | |
2219 | case atype_sequence_nestable: | |
2220 | default: | |
2221 | WARN_ON_ONCE(1); | |
2222 | return -EINVAL; | |
8070f5c0 | 2223 | } |
ceabb767 MD |
2224 | return ret; |
2225 | } | |
8070f5c0 | 2226 | |
ceabb767 MD |
2227 | /* |
2228 | * Must be called with sessions_mutex held. | |
2229 | */ | |
2230 | static | |
2231 | int _lttng_field_statedump(struct lttng_session *session, | |
2232 | const struct lttng_event_field *field, | |
2233 | size_t nesting) | |
2234 | { | |
2235 | int ret = 0; | |
27d2368e | 2236 | |
ceabb767 MD |
2237 | switch (field->type.atype) { |
2238 | case atype_integer: | |
2239 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
2240 | break; | |
2241 | case atype_enum_nestable: | |
2242 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 2243 | break; |
8070f5c0 | 2244 | case atype_string: |
ceabb767 | 2245 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 2246 | break; |
ceabb767 MD |
2247 | case atype_struct_nestable: |
2248 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 2249 | break; |
ceabb767 MD |
2250 | case atype_array_nestable: |
2251 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 2252 | break; |
ceabb767 MD |
2253 | case atype_sequence_nestable: |
2254 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 2255 | break; |
ceabb767 MD |
2256 | case atype_variant_nestable: |
2257 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 2258 | break; |
f513b2bf | 2259 | |
8070f5c0 MD |
2260 | default: |
2261 | WARN_ON_ONCE(1); | |
2262 | return -EINVAL; | |
2263 | } | |
2264 | return ret; | |
2265 | } | |
2266 | ||
2267 | static | |
a90917c3 | 2268 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2269 | struct lttng_ctx *ctx) |
2270 | { | |
2271 | int ret = 0; | |
2272 | int i; | |
2273 | ||
2274 | if (!ctx) | |
2275 | return 0; | |
2276 | for (i = 0; i < ctx->nr_fields; i++) { | |
2277 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2278 | ||
f513b2bf | 2279 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2280 | if (ret) |
2281 | return ret; | |
2282 | } | |
2283 | return ret; | |
2284 | } | |
2285 | ||
2286 | static | |
a90917c3 MD |
2287 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2288 | struct lttng_event *event) | |
8070f5c0 MD |
2289 | { |
2290 | const struct lttng_event_desc *desc = event->desc; | |
2291 | int ret = 0; | |
2292 | int i; | |
2293 | ||
2294 | for (i = 0; i < desc->nr_fields; i++) { | |
2295 | const struct lttng_event_field *field = &desc->fields[i]; | |
2296 | ||
f513b2bf | 2297 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2298 | if (ret) |
2299 | return ret; | |
c099397a MD |
2300 | } |
2301 | return ret; | |
2302 | } | |
2303 | ||
d83004aa JD |
2304 | /* |
2305 | * Must be called with sessions_mutex held. | |
2306 | */ | |
c099397a | 2307 | static |
a90917c3 MD |
2308 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2309 | struct lttng_channel *chan, | |
2310 | struct lttng_event *event) | |
c099397a MD |
2311 | { |
2312 | int ret = 0; | |
2313 | ||
a8f2d0c7 | 2314 | if (event->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2315 | return 0; |
d83004aa | 2316 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2317 | return 0; |
2318 | ||
2319 | ret = lttng_metadata_printf(session, | |
2320 | "event {\n" | |
ae734547 | 2321 | " name = \"%s\";\n" |
c099397a | 2322 | " id = %u;\n" |
b9074a1b | 2323 | " stream_id = %u;\n", |
c099397a MD |
2324 | event->desc->name, |
2325 | event->id, | |
2326 | event->chan->id); | |
2327 | if (ret) | |
2328 | goto end; | |
2329 | ||
b9074a1b MD |
2330 | if (event->ctx) { |
2331 | ret = lttng_metadata_printf(session, | |
2332 | " context := struct {\n"); | |
2333 | if (ret) | |
2334 | goto end; | |
2335 | } | |
a90917c3 | 2336 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2337 | if (ret) |
2338 | goto end; | |
b9074a1b MD |
2339 | if (event->ctx) { |
2340 | ret = lttng_metadata_printf(session, | |
2341 | " };\n"); | |
2342 | if (ret) | |
2343 | goto end; | |
2344 | } | |
8070f5c0 MD |
2345 | |
2346 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2347 | " fields := struct {\n" |
2348 | ); | |
2349 | if (ret) | |
2350 | goto end; | |
2351 | ||
a90917c3 | 2352 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2353 | if (ret) |
2354 | goto end; | |
2355 | ||
2356 | /* | |
2357 | * LTTng space reservation can only reserve multiples of the | |
2358 | * byte size. | |
2359 | */ | |
2360 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2361 | " };\n" |
2362 | "};\n\n"); | |
c099397a MD |
2363 | if (ret) |
2364 | goto end; | |
2365 | ||
c099397a MD |
2366 | event->metadata_dumped = 1; |
2367 | end: | |
2368 | return ret; | |
2369 | ||
2370 | } | |
2371 | ||
d83004aa JD |
2372 | /* |
2373 | * Must be called with sessions_mutex held. | |
2374 | */ | |
c099397a | 2375 | static |
a90917c3 MD |
2376 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2377 | struct lttng_channel *chan) | |
c099397a MD |
2378 | { |
2379 | int ret = 0; | |
2380 | ||
a8f2d0c7 | 2381 | if (chan->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2382 | return 0; |
d83004aa JD |
2383 | |
2384 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2385 | return 0; |
2386 | ||
2387 | WARN_ON_ONCE(!chan->header_type); | |
2388 | ret = lttng_metadata_printf(session, | |
2389 | "stream {\n" | |
2390 | " id = %u;\n" | |
9115fbdc | 2391 | " event.header := %s;\n" |
b9074a1b | 2392 | " packet.context := struct packet_context;\n", |
c099397a MD |
2393 | chan->id, |
2394 | chan->header_type == 1 ? "struct event_header_compact" : | |
2395 | "struct event_header_large"); | |
2396 | if (ret) | |
2397 | goto end; | |
2398 | ||
b9074a1b MD |
2399 | if (chan->ctx) { |
2400 | ret = lttng_metadata_printf(session, | |
2401 | " event.context := struct {\n"); | |
2402 | if (ret) | |
2403 | goto end; | |
2404 | } | |
a90917c3 | 2405 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2406 | if (ret) |
2407 | goto end; | |
b9074a1b MD |
2408 | if (chan->ctx) { |
2409 | ret = lttng_metadata_printf(session, | |
2410 | " };\n"); | |
2411 | if (ret) | |
2412 | goto end; | |
2413 | } | |
8070f5c0 MD |
2414 | |
2415 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2416 | "};\n\n"); |
8070f5c0 | 2417 | |
c099397a MD |
2418 | chan->metadata_dumped = 1; |
2419 | end: | |
2420 | return ret; | |
2421 | } | |
2422 | ||
d83004aa JD |
2423 | /* |
2424 | * Must be called with sessions_mutex held. | |
2425 | */ | |
9115fbdc | 2426 | static |
a90917c3 | 2427 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2428 | { |
2429 | return lttng_metadata_printf(session, | |
2430 | "struct packet_context {\n" | |
a3ccff4f MD |
2431 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2432 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2433 | " uint64_t content_size;\n" |
2434 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2435 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2436 | " unsigned long events_discarded;\n" |
9115fbdc | 2437 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2438 | "};\n\n" |
9115fbdc MD |
2439 | ); |
2440 | } | |
2441 | ||
2442 | /* | |
2443 | * Compact header: | |
2444 | * id: range: 0 - 30. | |
2445 | * id 31 is reserved to indicate an extended header. | |
2446 | * | |
2447 | * Large header: | |
2448 | * id: range: 0 - 65534. | |
2449 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2450 | * |
2451 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2452 | */ |
2453 | static | |
a90917c3 | 2454 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2455 | { |
2456 | return lttng_metadata_printf(session, | |
2457 | "struct event_header_compact {\n" | |
2458 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2459 | " variant <id> {\n" | |
2460 | " struct {\n" | |
a3ccff4f | 2461 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2462 | " } compact;\n" |
2463 | " struct {\n" | |
2464 | " uint32_t id;\n" | |
a3ccff4f | 2465 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2466 | " } extended;\n" |
2467 | " } v;\n" | |
2468 | "} align(%u);\n" | |
2469 | "\n" | |
2470 | "struct event_header_large {\n" | |
2471 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2472 | " variant <id> {\n" | |
2473 | " struct {\n" | |
a3ccff4f | 2474 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2475 | " } compact;\n" |
2476 | " struct {\n" | |
2477 | " uint32_t id;\n" | |
a3ccff4f | 2478 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2479 | " } extended;\n" |
2480 | " } v;\n" | |
2481 | "} align(%u);\n\n", | |
a90917c3 MD |
2482 | lttng_alignof(uint32_t) * CHAR_BIT, |
2483 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2484 | ); |
2485 | } | |
2486 | ||
a3ccff4f MD |
2487 | /* |
2488 | * Approximation of NTP time of day to clock monotonic correlation, | |
2489 | * taken at start of trace. | |
2490 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2491 | * in future versions. | |
5283350b MD |
2492 | * This function may return a negative offset. It may happen if the |
2493 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
2494 | * |
2495 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
2496 | * y2038 compliant. | |
a3ccff4f MD |
2497 | */ |
2498 | static | |
8967b2a3 | 2499 | int64_t measure_clock_offset(void) |
a3ccff4f | 2500 | { |
dcb93448 | 2501 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2502 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2503 | int64_t offset; |
a3ccff4f | 2504 | unsigned long flags; |
3636085f | 2505 | struct timespec64 rts = { 0, 0 }; |
a3ccff4f MD |
2506 | |
2507 | /* Disable interrupts to increase correlation precision. */ | |
2508 | local_irq_save(flags); | |
2509 | monotonic[0] = trace_clock_read64(); | |
3636085f | 2510 | ktime_get_real_ts64(&rts); |
a3ccff4f MD |
2511 | monotonic[1] = trace_clock_read64(); |
2512 | local_irq_restore(flags); | |
2513 | ||
dcb93448 | 2514 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2515 | realtime = (uint64_t) rts.tv_sec * tcf; |
2516 | if (tcf == NSEC_PER_SEC) { | |
2517 | realtime += rts.tv_nsec; | |
2518 | } else { | |
2519 | uint64_t n = rts.tv_nsec * tcf; | |
2520 | ||
2521 | do_div(n, NSEC_PER_SEC); | |
2522 | realtime += n; | |
2523 | } | |
dcb93448 | 2524 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2525 | return offset; |
2526 | } | |
2527 | ||
3eb95be4 JR |
2528 | static |
2529 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
2530 | { | |
0f3eaad4 | 2531 | int ret = 0; |
3eb95be4 JR |
2532 | size_t i; |
2533 | char cur; | |
2534 | ||
2535 | i = 0; | |
2536 | cur = string[i]; | |
2537 | while (cur != '\0') { | |
2538 | switch (cur) { | |
2539 | case '\n': | |
2540 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
2541 | break; | |
2542 | case '\\': | |
2543 | case '"': | |
2544 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
2545 | if (ret) | |
2546 | goto error; | |
2547 | /* We still print the current char */ | |
2548 | /* Fallthrough */ | |
2549 | default: | |
2550 | ret = lttng_metadata_printf(session, "%c", cur); | |
2551 | break; | |
2552 | } | |
2553 | ||
2554 | if (ret) | |
2555 | goto error; | |
2556 | ||
2557 | cur = string[++i]; | |
2558 | } | |
2559 | error: | |
2560 | return ret; | |
2561 | } | |
2562 | ||
2563 | static | |
1c88f269 JR |
2564 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
2565 | const char *field_value) | |
3eb95be4 JR |
2566 | { |
2567 | int ret; | |
2568 | ||
1c88f269 | 2569 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
2570 | if (ret) |
2571 | goto error; | |
2572 | ||
1c88f269 | 2573 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
2574 | if (ret) |
2575 | goto error; | |
2576 | ||
2577 | ret = lttng_metadata_printf(session, "\";\n"); | |
2578 | ||
2579 | error: | |
2580 | return ret; | |
2581 | } | |
2582 | ||
c099397a MD |
2583 | /* |
2584 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2585 | * Must be called with sessions_mutex held. |
c099397a MD |
2586 | */ |
2587 | static | |
a90917c3 | 2588 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2589 | { |
30bdb6e4 | 2590 | unsigned char *uuid_c = session->uuid.b; |
a82c63f1 | 2591 | unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; |
c88f762e | 2592 | const char *product_uuid; |
a90917c3 MD |
2593 | struct lttng_channel *chan; |
2594 | struct lttng_event *event; | |
c099397a MD |
2595 | int ret = 0; |
2596 | ||
a8f2d0c7 | 2597 | if (!READ_ONCE(session->active)) |
c099397a MD |
2598 | return 0; |
2599 | if (session->metadata_dumped) | |
2600 | goto skip_session; | |
c099397a | 2601 | |
d793d5e1 | 2602 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2603 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2604 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2605 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2606 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2607 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2608 | |
2609 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2610 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2611 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2612 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2613 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2614 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2615 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2616 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2617 | "\n" |
2618 | "trace {\n" | |
2619 | " major = %u;\n" | |
2620 | " minor = %u;\n" | |
30bdb6e4 | 2621 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2622 | " byte_order = %s;\n" |
2623 | " packet.header := struct {\n" | |
2624 | " uint32_t magic;\n" | |
1ec3f75a | 2625 | " uint8_t uuid[16];\n" |
d793d5e1 | 2626 | " uint32_t stream_id;\n" |
5594698f | 2627 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2628 | " };\n" |
d793d5e1 | 2629 | "};\n\n", |
a90917c3 MD |
2630 | lttng_alignof(uint8_t) * CHAR_BIT, |
2631 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2632 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2633 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2634 | sizeof(unsigned long) * CHAR_BIT, |
2635 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2636 | CTF_SPEC_MAJOR, |
2637 | CTF_SPEC_MINOR, | |
d793d5e1 | 2638 | uuid_s, |
5214fa50 | 2639 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2640 | "be" |
2641 | #else | |
2642 | "le" | |
2643 | #endif | |
2644 | ); | |
2645 | if (ret) | |
2646 | goto end; | |
2647 | ||
99dc9597 MD |
2648 | ret = lttng_metadata_printf(session, |
2649 | "env {\n" | |
a6058143 | 2650 | " hostname = \"%s\";\n" |
c6c9e10f | 2651 | " domain = \"kernel\";\n" |
99dc9597 | 2652 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2653 | " kernel_release = \"%s\";\n" |
2654 | " kernel_version = \"%s\";\n" | |
2655 | " tracer_name = \"lttng-modules\";\n" | |
2656 | " tracer_major = %d;\n" | |
2657 | " tracer_minor = %d;\n" | |
2658 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 2659 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 2660 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2661 | utsname()->sysname, |
2662 | utsname()->release, | |
c6c9e10f MD |
2663 | utsname()->version, |
2664 | LTTNG_MODULES_MAJOR_VERSION, | |
2665 | LTTNG_MODULES_MINOR_VERSION, | |
2666 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2667 | ); |
2668 | if (ret) | |
2669 | goto end; | |
2670 | ||
1c88f269 JR |
2671 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
2672 | if (ret) | |
2673 | goto end; | |
2674 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
2675 | session->creation_time); | |
3eb95be4 JR |
2676 | if (ret) |
2677 | goto end; | |
2678 | ||
c88f762e GB |
2679 | /* Add the product UUID to the 'env' section */ |
2680 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
2681 | if (product_uuid) { | |
2682 | ret = lttng_metadata_printf(session, | |
2683 | " product_uuid = \"%s\";\n", | |
2684 | product_uuid | |
2685 | ); | |
2686 | if (ret) | |
2687 | goto end; | |
2688 | } | |
2689 | ||
2690 | /* Close the 'env' section */ | |
3eb95be4 JR |
2691 | ret = lttng_metadata_printf(session, "};\n\n"); |
2692 | if (ret) | |
2693 | goto end; | |
2694 | ||
a3ccff4f MD |
2695 | ret = lttng_metadata_printf(session, |
2696 | "clock {\n" | |
2754583e MD |
2697 | " name = \"%s\";\n", |
2698 | trace_clock_name() | |
a82c63f1 MD |
2699 | ); |
2700 | if (ret) | |
2701 | goto end; | |
2702 | ||
2703 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2704 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2705 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2706 | clock_uuid_s |
2707 | ); | |
2708 | if (ret) | |
2709 | goto end; | |
2710 | } | |
2711 | ||
2712 | ret = lttng_metadata_printf(session, | |
2754583e | 2713 | " description = \"%s\";\n" |
a3ccff4f MD |
2714 | " freq = %llu; /* Frequency, in Hz */\n" |
2715 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2716 | " offset = %lld;\n" |
a3ccff4f | 2717 | "};\n\n", |
2754583e | 2718 | trace_clock_description(), |
a3ccff4f | 2719 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2720 | (long long) measure_clock_offset() |
a3ccff4f MD |
2721 | ); |
2722 | if (ret) | |
2723 | goto end; | |
2724 | ||
2725 | ret = lttng_metadata_printf(session, | |
2726 | "typealias integer {\n" | |
2727 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2728 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2729 | "} := uint27_clock_monotonic_t;\n" |
2730 | "\n" | |
2731 | "typealias integer {\n" | |
2732 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2733 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2734 | "} := uint32_clock_monotonic_t;\n" |
2735 | "\n" | |
2736 | "typealias integer {\n" | |
2737 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2738 | " map = clock.%s.value;\n" |
a3ccff4f | 2739 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2740 | trace_clock_name(), |
a3ccff4f | 2741 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2742 | trace_clock_name(), |
2743 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2744 | trace_clock_name() | |
a3ccff4f MD |
2745 | ); |
2746 | if (ret) | |
2747 | goto end; | |
2748 | ||
a90917c3 | 2749 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2750 | if (ret) |
2751 | goto end; | |
2752 | ||
a90917c3 | 2753 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2754 | if (ret) |
2755 | goto end; | |
2756 | ||
c099397a MD |
2757 | skip_session: |
2758 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2759 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2760 | if (ret) |
2761 | goto end; | |
2762 | } | |
2763 | ||
2764 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2765 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2766 | if (ret) |
2767 | goto end; | |
2768 | } | |
2769 | session->metadata_dumped = 1; | |
2770 | end: | |
2771 | return ret; | |
2772 | } | |
2773 | ||
c0e31d2e | 2774 | /** |
a90917c3 | 2775 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2776 | * @transport: transport structure |
2777 | * | |
2778 | * Registers a transport which can be used as output to extract the data out of | |
c50bdba2 | 2779 | * LTTng. |
c0e31d2e | 2780 | */ |
a90917c3 | 2781 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e | 2782 | { |
c0e31d2e | 2783 | mutex_lock(&sessions_mutex); |
a90917c3 | 2784 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2785 | mutex_unlock(&sessions_mutex); |
2786 | } | |
a90917c3 | 2787 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2788 | |
2789 | /** | |
a90917c3 | 2790 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2791 | * @transport: transport structure |
2792 | */ | |
a90917c3 | 2793 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2794 | { |
2795 | mutex_lock(&sessions_mutex); | |
2796 | list_del(&transport->node); | |
2797 | mutex_unlock(&sessions_mutex); | |
2798 | } | |
a90917c3 | 2799 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2800 | |
894ce5dc | 2801 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) |
1e367326 MD |
2802 | |
2803 | enum cpuhp_state lttng_hp_prepare; | |
2804 | enum cpuhp_state lttng_hp_online; | |
2805 | ||
2806 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2807 | { | |
2808 | struct lttng_cpuhp_node *lttng_node; | |
2809 | ||
2810 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2811 | switch (lttng_node->component) { | |
2812 | case LTTNG_RING_BUFFER_FRONTEND: | |
2813 | return 0; | |
2814 | case LTTNG_RING_BUFFER_BACKEND: | |
2815 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2816 | case LTTNG_RING_BUFFER_ITER: | |
2817 | return 0; | |
2818 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2819 | return 0; | |
2820 | default: | |
2821 | return -EINVAL; | |
2822 | } | |
2823 | } | |
2824 | ||
2825 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2826 | { | |
2827 | struct lttng_cpuhp_node *lttng_node; | |
2828 | ||
2829 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2830 | switch (lttng_node->component) { | |
2831 | case LTTNG_RING_BUFFER_FRONTEND: | |
2832 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2833 | case LTTNG_RING_BUFFER_BACKEND: | |
2834 | return 0; | |
2835 | case LTTNG_RING_BUFFER_ITER: | |
2836 | return 0; | |
2837 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2838 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2839 | default: | |
2840 | return -EINVAL; | |
2841 | } | |
2842 | } | |
2843 | ||
2844 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2845 | { | |
2846 | struct lttng_cpuhp_node *lttng_node; | |
2847 | ||
2848 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2849 | switch (lttng_node->component) { | |
2850 | case LTTNG_RING_BUFFER_FRONTEND: | |
2851 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2852 | case LTTNG_RING_BUFFER_BACKEND: | |
2853 | return 0; | |
2854 | case LTTNG_RING_BUFFER_ITER: | |
2855 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2856 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2857 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2858 | default: | |
2859 | return -EINVAL; | |
2860 | } | |
2861 | } | |
2862 | ||
2863 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2864 | { | |
2865 | struct lttng_cpuhp_node *lttng_node; | |
2866 | ||
2867 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2868 | switch (lttng_node->component) { | |
2869 | case LTTNG_RING_BUFFER_FRONTEND: | |
2870 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2871 | case LTTNG_RING_BUFFER_BACKEND: | |
2872 | return 0; | |
2873 | case LTTNG_RING_BUFFER_ITER: | |
2874 | return 0; | |
2875 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2876 | return 0; | |
2877 | default: | |
2878 | return -EINVAL; | |
2879 | } | |
2880 | } | |
2881 | ||
2882 | static int __init lttng_init_cpu_hotplug(void) | |
2883 | { | |
2884 | int ret; | |
2885 | ||
2886 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2887 | lttng_hotplug_prepare, | |
2888 | lttng_hotplug_dead); | |
2889 | if (ret < 0) { | |
2890 | return ret; | |
2891 | } | |
2892 | lttng_hp_prepare = ret; | |
2893 | lttng_rb_set_hp_prepare(ret); | |
2894 | ||
2895 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2896 | lttng_hotplug_online, | |
2897 | lttng_hotplug_offline); | |
2898 | if (ret < 0) { | |
2899 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2900 | lttng_hp_prepare = 0; | |
2901 | return ret; | |
2902 | } | |
2903 | lttng_hp_online = ret; | |
2904 | lttng_rb_set_hp_online(ret); | |
2905 | ||
2906 | return 0; | |
2907 | } | |
2908 | ||
2909 | static void __exit lttng_exit_cpu_hotplug(void) | |
2910 | { | |
2911 | lttng_rb_set_hp_online(0); | |
2912 | cpuhp_remove_multi_state(lttng_hp_online); | |
2913 | lttng_rb_set_hp_prepare(0); | |
2914 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2915 | } | |
2916 | ||
1ee63d8d | 2917 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2918 | static int lttng_init_cpu_hotplug(void) |
2919 | { | |
2920 | return 0; | |
2921 | } | |
2922 | static void lttng_exit_cpu_hotplug(void) | |
2923 | { | |
2924 | } | |
1ee63d8d | 2925 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ |
1e367326 MD |
2926 | |
2927 | ||
a90917c3 | 2928 | static int __init lttng_events_init(void) |
4e3c1b9b | 2929 | { |
1c25284c MD |
2930 | int ret; |
2931 | ||
114667d5 | 2932 | ret = lttng_probes_init(); |
389d7070 MD |
2933 | if (ret) |
2934 | return ret; | |
07dfc1d0 | 2935 | ret = lttng_context_init(); |
20591cf7 MD |
2936 | if (ret) |
2937 | return ret; | |
07dfc1d0 MD |
2938 | ret = lttng_tracepoint_init(); |
2939 | if (ret) | |
2940 | goto error_tp; | |
a90917c3 | 2941 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2942 | if (!event_cache) { |
2943 | ret = -ENOMEM; | |
2944 | goto error_kmem; | |
2945 | } | |
80996790 | 2946 | ret = lttng_abi_init(); |
02119ee5 MD |
2947 | if (ret) |
2948 | goto error_abi; | |
0c956676 MD |
2949 | ret = lttng_logger_init(); |
2950 | if (ret) | |
2951 | goto error_logger; | |
1e367326 MD |
2952 | ret = lttng_init_cpu_hotplug(); |
2953 | if (ret) | |
2954 | goto error_hotplug; | |
101215b7 | 2955 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2956 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2957 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2958 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2959 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2960 | LTTNG_VERSION_NAME, |
2961 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2962 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2963 | #else | |
2964 | "", | |
2965 | #endif | |
2966 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2967 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2968 | #else | |
2969 | ""); | |
2970 | #endif | |
4e3c1b9b | 2971 | return 0; |
0c956676 | 2972 | |
1e367326 MD |
2973 | error_hotplug: |
2974 | lttng_logger_exit(); | |
0c956676 MD |
2975 | error_logger: |
2976 | lttng_abi_exit(); | |
02119ee5 | 2977 | error_abi: |
1c25284c | 2978 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2979 | error_kmem: |
2980 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2981 | error_tp: |
2982 | lttng_context_exit(); | |
101215b7 | 2983 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2984 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2985 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2986 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2987 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2988 | LTTNG_VERSION_NAME, |
2989 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2990 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2991 | #else | |
2992 | "", | |
2993 | #endif | |
2994 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2995 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2996 | #else | |
2997 | ""); | |
2998 | #endif | |
1c25284c | 2999 | return ret; |
4e3c1b9b MD |
3000 | } |
3001 | ||
a90917c3 | 3002 | module_init(lttng_events_init); |
11b5a3c2 | 3003 | |
a90917c3 | 3004 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 3005 | { |
a90917c3 | 3006 | struct lttng_session *session, *tmpsession; |
92e94819 | 3007 | |
1e367326 | 3008 | lttng_exit_cpu_hotplug(); |
0c956676 | 3009 | lttng_logger_exit(); |
80996790 | 3010 | lttng_abi_exit(); |
92e94819 | 3011 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 3012 | lttng_session_destroy(session); |
11b5a3c2 | 3013 | kmem_cache_destroy(event_cache); |
20591cf7 | 3014 | lttng_tracepoint_exit(); |
07dfc1d0 | 3015 | lttng_context_exit(); |
101215b7 | 3016 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
3017 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
3018 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
3019 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
3020 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
3021 | LTTNG_VERSION_NAME, |
3022 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3023 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
3024 | #else | |
3025 | "", | |
3026 | #endif | |
3027 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3028 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3029 | #else | |
3030 | ""); | |
3031 | #endif | |
4e3c1b9b | 3032 | } |
92e94819 | 3033 | |
a90917c3 | 3034 | module_exit(lttng_events_exit); |
11b5a3c2 | 3035 | |
101215b7 MJ |
3036 | #include "extra_version/patches.i" |
3037 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3038 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3039 | #endif | |
3040 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3041 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3042 | #endif | |
92e94819 MD |
3043 | MODULE_LICENSE("GPL and additional rights"); |
3044 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3045 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3046 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3047 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3048 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3049 | LTTNG_MODULES_EXTRAVERSION); |