Commit | Line | Data |
---|---|---|
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 | |
84bbd9ea | 27 | #include <linux/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> |
5760f3f4 MD |
35 | #include <include/ringbuffer/backend.h> |
36 | #include <include/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 | 74 | synchronize_rcu(); |
abcca994 MD |
75 | } |
76 | ||
3c997079 MD |
77 | void lttng_lock_sessions(void) |
78 | { | |
79 | mutex_lock(&sessions_mutex); | |
80 | } | |
81 | ||
82 | void lttng_unlock_sessions(void) | |
83 | { | |
84 | mutex_unlock(&sessions_mutex); | |
85 | } | |
86 | ||
87 | /* | |
88 | * Called with sessions lock held. | |
89 | */ | |
90 | int lttng_session_active(void) | |
91 | { | |
92 | struct lttng_session *iter; | |
93 | ||
94 | list_for_each_entry(iter, &sessions, list) { | |
95 | if (iter->active) | |
96 | return 1; | |
97 | } | |
98 | return 0; | |
99 | } | |
100 | ||
a90917c3 | 101 | struct lttng_session *lttng_session_create(void) |
4e3c1b9b | 102 | { |
a90917c3 | 103 | struct lttng_session *session; |
d83004aa | 104 | struct lttng_metadata_cache *metadata_cache; |
3c997079 | 105 | int i; |
4e3c1b9b MD |
106 | |
107 | mutex_lock(&sessions_mutex); | |
c50bdba2 MD |
108 | session = kvzalloc_node(sizeof(struct lttng_session), GFP_KERNEL, |
109 | NUMA_NO_NODE); | |
4e3c1b9b | 110 | if (!session) |
d83004aa | 111 | goto err; |
4e3c1b9b | 112 | INIT_LIST_HEAD(&session->chan); |
f3d01b96 | 113 | INIT_LIST_HEAD(&session->events); |
496a7e97 | 114 | guid_gen(&session->uuid); |
d83004aa JD |
115 | |
116 | metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), | |
117 | GFP_KERNEL); | |
118 | if (!metadata_cache) | |
119 | goto err_free_session; | |
0ca42eb7 | 120 | metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE); |
d83004aa JD |
121 | if (!metadata_cache->data) |
122 | goto err_free_cache; | |
123 | metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE; | |
124 | kref_init(&metadata_cache->refcount); | |
92d9f5e6 | 125 | mutex_init(&metadata_cache->lock); |
d83004aa JD |
126 | session->metadata_cache = metadata_cache; |
127 | INIT_LIST_HEAD(&metadata_cache->metadata_stream); | |
a36580d5 MD |
128 | memcpy(&metadata_cache->uuid, &session->uuid, |
129 | sizeof(metadata_cache->uuid)); | |
3c997079 MD |
130 | INIT_LIST_HEAD(&session->enablers_head); |
131 | for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++) | |
132 | INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
4e3c1b9b | 133 | list_add(&session->list, &sessions); |
d1f652f8 MD |
134 | session->pid_tracker.session = session; |
135 | session->pid_tracker.tracker_type = TRACKER_PID; | |
136 | session->vpid_tracker.session = session; | |
137 | session->vpid_tracker.tracker_type = TRACKER_VPID; | |
138 | session->uid_tracker.session = session; | |
139 | session->uid_tracker.tracker_type = TRACKER_UID; | |
140 | session->vuid_tracker.session = session; | |
141 | session->vuid_tracker.tracker_type = TRACKER_VUID; | |
142 | session->gid_tracker.session = session; | |
143 | session->gid_tracker.tracker_type = TRACKER_GID; | |
144 | session->vgid_tracker.session = session; | |
145 | session->vgid_tracker.tracker_type = TRACKER_VGID; | |
4e3c1b9b MD |
146 | mutex_unlock(&sessions_mutex); |
147 | return session; | |
d83004aa JD |
148 | |
149 | err_free_cache: | |
150 | kfree(metadata_cache); | |
151 | err_free_session: | |
c50bdba2 | 152 | kvfree(session); |
d83004aa JD |
153 | err: |
154 | mutex_unlock(&sessions_mutex); | |
155 | return NULL; | |
156 | } | |
157 | ||
158 | void metadata_cache_destroy(struct kref *kref) | |
159 | { | |
160 | struct lttng_metadata_cache *cache = | |
161 | container_of(kref, struct lttng_metadata_cache, refcount); | |
a606b6e8 | 162 | vfree(cache->data); |
d83004aa | 163 | kfree(cache); |
4e3c1b9b MD |
164 | } |
165 | ||
a90917c3 | 166 | void lttng_session_destroy(struct lttng_session *session) |
4e3c1b9b | 167 | { |
a90917c3 MD |
168 | struct lttng_channel *chan, *tmpchan; |
169 | struct lttng_event *event, *tmpevent; | |
d83004aa | 170 | struct lttng_metadata_stream *metadata_stream; |
3c997079 | 171 | struct lttng_enabler *enabler, *tmpenabler; |
dda6a249 | 172 | int ret; |
4e3c1b9b MD |
173 | |
174 | mutex_lock(&sessions_mutex); | |
a8f2d0c7 | 175 | WRITE_ONCE(session->active, 0); |
1ec65de1 MD |
176 | list_for_each_entry(chan, &session->chan, list) { |
177 | ret = lttng_syscalls_unregister(chan); | |
178 | WARN_ON(ret); | |
179 | } | |
dda6a249 | 180 | list_for_each_entry(event, &session->events, list) { |
a90917c3 | 181 | ret = _lttng_event_unregister(event); |
dda6a249 MD |
182 | WARN_ON(ret); |
183 | } | |
abcca994 | 184 | synchronize_trace(); /* Wait for in-flight events to complete */ |
3c997079 MD |
185 | list_for_each_entry_safe(enabler, tmpenabler, |
186 | &session->enablers_head, node) | |
187 | lttng_enabler_destroy(enabler); | |
4e3c1b9b | 188 | list_for_each_entry_safe(event, tmpevent, &session->events, list) |
a90917c3 | 189 | _lttng_event_destroy(event); |
d83004aa JD |
190 | list_for_each_entry_safe(chan, tmpchan, &session->chan, list) { |
191 | BUG_ON(chan->channel_type == METADATA_CHANNEL); | |
a90917c3 | 192 | _lttng_channel_destroy(chan); |
d83004aa JD |
193 | } |
194 | list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) | |
195 | _lttng_metadata_channel_hangup(metadata_stream); | |
d1f652f8 MD |
196 | lttng_id_tracker_destroy(&session->pid_tracker, false); |
197 | lttng_id_tracker_destroy(&session->vpid_tracker, false); | |
198 | lttng_id_tracker_destroy(&session->uid_tracker, false); | |
199 | lttng_id_tracker_destroy(&session->vuid_tracker, false); | |
200 | lttng_id_tracker_destroy(&session->gid_tracker, false); | |
201 | lttng_id_tracker_destroy(&session->vgid_tracker, false); | |
d83004aa | 202 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
4e3c1b9b MD |
203 | list_del(&session->list); |
204 | mutex_unlock(&sessions_mutex); | |
c50bdba2 | 205 | kvfree(session); |
4e3c1b9b MD |
206 | } |
207 | ||
601252cf MD |
208 | int lttng_session_statedump(struct lttng_session *session) |
209 | { | |
210 | int ret; | |
211 | ||
212 | mutex_lock(&sessions_mutex); | |
213 | ret = lttng_statedump_start(session); | |
214 | mutex_unlock(&sessions_mutex); | |
215 | return ret; | |
216 | } | |
217 | ||
a90917c3 | 218 | int lttng_session_enable(struct lttng_session *session) |
c0e31d2e MD |
219 | { |
220 | int ret = 0; | |
a90917c3 | 221 | struct lttng_channel *chan; |
c0e31d2e MD |
222 | |
223 | mutex_lock(&sessions_mutex); | |
224 | if (session->active) { | |
225 | ret = -EBUSY; | |
226 | goto end; | |
227 | } | |
c099397a | 228 | |
3c997079 MD |
229 | /* Set transient enabler state to "enabled" */ |
230 | session->tstate = 1; | |
231 | ||
4ef81e4a MD |
232 | /* We need to sync enablers with session before activation. */ |
233 | lttng_session_sync_enablers(session); | |
234 | ||
c099397a MD |
235 | /* |
236 | * Snapshot the number of events per channel to know the type of header | |
237 | * we need to use. | |
238 | */ | |
239 | list_for_each_entry(chan, &session->chan, list) { | |
240 | if (chan->header_type) | |
241 | continue; /* don't change it if session stop/restart */ | |
242 | if (chan->free_event_id < 31) | |
243 | chan->header_type = 1; /* compact */ | |
244 | else | |
245 | chan->header_type = 2; /* large */ | |
246 | } | |
247 | ||
64af2437 | 248 | /* Clear each stream's quiescent state. */ |
09b93db9 MD |
249 | list_for_each_entry(chan, &session->chan, list) { |
250 | if (chan->channel_type != METADATA_CHANNEL) | |
251 | lib_ring_buffer_clear_quiescent_channel(chan->chan); | |
252 | } | |
64af2437 | 253 | |
a8f2d0c7 MJ |
254 | WRITE_ONCE(session->active, 1); |
255 | WRITE_ONCE(session->been_active, 1); | |
a90917c3 | 256 | ret = _lttng_session_metadata_statedump(session); |
c337ddc2 | 257 | if (ret) { |
a8f2d0c7 | 258 | WRITE_ONCE(session->active, 0); |
c337ddc2 MD |
259 | goto end; |
260 | } | |
261 | ret = lttng_statedump_start(session); | |
360f38ea | 262 | if (ret) |
a8f2d0c7 | 263 | WRITE_ONCE(session->active, 0); |
c0e31d2e MD |
264 | end: |
265 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 266 | return ret; |
c0e31d2e MD |
267 | } |
268 | ||
a90917c3 | 269 | int lttng_session_disable(struct lttng_session *session) |
c0e31d2e MD |
270 | { |
271 | int ret = 0; | |
64af2437 | 272 | struct lttng_channel *chan; |
c0e31d2e MD |
273 | |
274 | mutex_lock(&sessions_mutex); | |
275 | if (!session->active) { | |
276 | ret = -EBUSY; | |
277 | goto end; | |
278 | } | |
a8f2d0c7 | 279 | WRITE_ONCE(session->active, 0); |
3c997079 MD |
280 | |
281 | /* Set transient enabler state to "disabled" */ | |
282 | session->tstate = 0; | |
283 | lttng_session_sync_enablers(session); | |
64af2437 MD |
284 | |
285 | /* Set each stream's quiescent state. */ | |
09b93db9 MD |
286 | list_for_each_entry(chan, &session->chan, list) { |
287 | if (chan->channel_type != METADATA_CHANNEL) | |
288 | lib_ring_buffer_set_quiescent_channel(chan->chan); | |
289 | } | |
c0e31d2e MD |
290 | end: |
291 | mutex_unlock(&sessions_mutex); | |
11b5a3c2 | 292 | return ret; |
c0e31d2e MD |
293 | } |
294 | ||
9616f0bf JD |
295 | int lttng_session_metadata_regenerate(struct lttng_session *session) |
296 | { | |
297 | int ret = 0; | |
298 | struct lttng_channel *chan; | |
299 | struct lttng_event *event; | |
300 | struct lttng_metadata_cache *cache = session->metadata_cache; | |
301 | struct lttng_metadata_stream *stream; | |
302 | ||
303 | mutex_lock(&sessions_mutex); | |
304 | if (!session->active) { | |
305 | ret = -EBUSY; | |
306 | goto end; | |
307 | } | |
308 | ||
309 | mutex_lock(&cache->lock); | |
310 | memset(cache->data, 0, cache->cache_alloc); | |
311 | cache->metadata_written = 0; | |
312 | cache->version++; | |
313 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) { | |
314 | stream->metadata_out = 0; | |
315 | stream->metadata_in = 0; | |
316 | } | |
317 | mutex_unlock(&cache->lock); | |
318 | ||
319 | session->metadata_dumped = 0; | |
320 | list_for_each_entry(chan, &session->chan, list) { | |
321 | chan->metadata_dumped = 0; | |
322 | } | |
323 | ||
324 | list_for_each_entry(event, &session->events, list) { | |
325 | event->metadata_dumped = 0; | |
326 | } | |
327 | ||
328 | ret = _lttng_session_metadata_statedump(session); | |
329 | ||
330 | end: | |
331 | mutex_unlock(&sessions_mutex); | |
332 | return ret; | |
333 | } | |
334 | ||
a90917c3 | 335 | int lttng_channel_enable(struct lttng_channel *channel) |
e64957da | 336 | { |
3c997079 | 337 | int ret = 0; |
e64957da | 338 | |
3c997079 MD |
339 | mutex_lock(&sessions_mutex); |
340 | if (channel->channel_type == METADATA_CHANNEL) { | |
341 | ret = -EPERM; | |
342 | goto end; | |
343 | } | |
344 | if (channel->enabled) { | |
345 | ret = -EEXIST; | |
346 | goto end; | |
347 | } | |
348 | /* Set transient enabler state to "enabled" */ | |
349 | channel->tstate = 1; | |
350 | lttng_session_sync_enablers(channel->session); | |
351 | /* Set atomically the state to "enabled" */ | |
a8f2d0c7 | 352 | WRITE_ONCE(channel->enabled, 1); |
3c997079 MD |
353 | end: |
354 | mutex_unlock(&sessions_mutex); | |
355 | return ret; | |
e64957da MD |
356 | } |
357 | ||
a90917c3 | 358 | int lttng_channel_disable(struct lttng_channel *channel) |
e64957da | 359 | { |
3c997079 | 360 | int ret = 0; |
e64957da | 361 | |
3c997079 MD |
362 | mutex_lock(&sessions_mutex); |
363 | if (channel->channel_type == METADATA_CHANNEL) { | |
364 | ret = -EPERM; | |
365 | goto end; | |
366 | } | |
367 | if (!channel->enabled) { | |
368 | ret = -EEXIST; | |
369 | goto end; | |
370 | } | |
371 | /* Set atomically the state to "disabled" */ | |
a8f2d0c7 | 372 | WRITE_ONCE(channel->enabled, 0); |
3c997079 MD |
373 | /* Set transient enabler state to "enabled" */ |
374 | channel->tstate = 0; | |
375 | lttng_session_sync_enablers(channel->session); | |
376 | end: | |
377 | mutex_unlock(&sessions_mutex); | |
378 | return ret; | |
e64957da MD |
379 | } |
380 | ||
a90917c3 | 381 | int lttng_event_enable(struct lttng_event *event) |
e64957da | 382 | { |
3c997079 | 383 | int ret = 0; |
e64957da | 384 | |
3c997079 MD |
385 | mutex_lock(&sessions_mutex); |
386 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
387 | ret = -EPERM; | |
388 | goto end; | |
389 | } | |
390 | if (event->enabled) { | |
391 | ret = -EEXIST; | |
392 | goto end; | |
393 | } | |
a0493bef MD |
394 | switch (event->instrumentation) { |
395 | case LTTNG_KERNEL_TRACEPOINT: | |
396 | case LTTNG_KERNEL_SYSCALL: | |
397 | ret = -EINVAL; | |
398 | break; | |
399 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 400 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 401 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 402 | WRITE_ONCE(event->enabled, 1); |
a0493bef MD |
403 | break; |
404 | case LTTNG_KERNEL_KRETPROBE: | |
405 | ret = lttng_kretprobes_event_enable_state(event, 1); | |
406 | break; | |
e884017c | 407 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
408 | default: |
409 | WARN_ON_ONCE(1); | |
410 | ret = -EINVAL; | |
411 | } | |
3c997079 MD |
412 | end: |
413 | mutex_unlock(&sessions_mutex); | |
414 | return ret; | |
e64957da MD |
415 | } |
416 | ||
a90917c3 | 417 | int lttng_event_disable(struct lttng_event *event) |
e64957da | 418 | { |
3c997079 | 419 | int ret = 0; |
e64957da | 420 | |
3c997079 MD |
421 | mutex_lock(&sessions_mutex); |
422 | if (event->chan->channel_type == METADATA_CHANNEL) { | |
423 | ret = -EPERM; | |
424 | goto end; | |
425 | } | |
426 | if (!event->enabled) { | |
427 | ret = -EEXIST; | |
428 | goto end; | |
429 | } | |
a0493bef MD |
430 | switch (event->instrumentation) { |
431 | case LTTNG_KERNEL_TRACEPOINT: | |
432 | case LTTNG_KERNEL_SYSCALL: | |
433 | ret = -EINVAL; | |
434 | break; | |
435 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 436 | case LTTNG_KERNEL_UPROBE: |
a0493bef | 437 | case LTTNG_KERNEL_NOOP: |
a8f2d0c7 | 438 | WRITE_ONCE(event->enabled, 0); |
a0493bef MD |
439 | break; |
440 | case LTTNG_KERNEL_KRETPROBE: | |
441 | ret = lttng_kretprobes_event_enable_state(event, 0); | |
442 | break; | |
e884017c | 443 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
a0493bef MD |
444 | default: |
445 | WARN_ON_ONCE(1); | |
446 | ret = -EINVAL; | |
447 | } | |
3c997079 MD |
448 | end: |
449 | mutex_unlock(&sessions_mutex); | |
450 | return ret; | |
e64957da MD |
451 | } |
452 | ||
a90917c3 | 453 | static struct lttng_transport *lttng_transport_find(const char *name) |
f3d01b96 | 454 | { |
a90917c3 | 455 | struct lttng_transport *transport; |
f3d01b96 | 456 | |
a90917c3 | 457 | list_for_each_entry(transport, <tng_transport_list, node) { |
f3d01b96 MD |
458 | if (!strcmp(transport->name, name)) |
459 | return transport; | |
460 | } | |
461 | return NULL; | |
462 | } | |
463 | ||
a90917c3 | 464 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
5dbbdb43 MD |
465 | const char *transport_name, |
466 | void *buf_addr, | |
4e3c1b9b MD |
467 | size_t subbuf_size, size_t num_subbuf, |
468 | unsigned int switch_timer_interval, | |
d83004aa JD |
469 | unsigned int read_timer_interval, |
470 | enum channel_type channel_type) | |
4e3c1b9b | 471 | { |
a90917c3 MD |
472 | struct lttng_channel *chan; |
473 | struct lttng_transport *transport = NULL; | |
4e3c1b9b MD |
474 | |
475 | mutex_lock(&sessions_mutex); | |
d83004aa | 476 | if (session->been_active && channel_type != METADATA_CHANNEL) |
e5382b6d | 477 | goto active; /* Refuse to add channel to active session */ |
a90917c3 | 478 | transport = lttng_transport_find(transport_name); |
f3d01b96 MD |
479 | if (!transport) { |
480 | printk(KERN_WARNING "LTTng transport %s not found\n", | |
481 | transport_name); | |
c0e31d2e | 482 | goto notransport; |
f3d01b96 | 483 | } |
a33c9927 MD |
484 | if (!try_module_get(transport->owner)) { |
485 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
486 | goto notransport; | |
487 | } | |
a90917c3 | 488 | chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL); |
4e3c1b9b | 489 | if (!chan) |
c0e31d2e | 490 | goto nomem; |
4e3c1b9b | 491 | chan->session = session; |
05d32c64 | 492 | chan->id = session->free_chan_id++; |
3b731ab1 | 493 | chan->ops = &transport->ops; |
125b4df4 MD |
494 | /* |
495 | * Note: the channel creation op already writes into the packet | |
496 | * headers. Therefore the "chan" information used as input | |
497 | * should be already accessible. | |
498 | */ | |
5f5ddf01 MD |
499 | chan->chan = transport->ops.channel_create(transport_name, |
500 | chan, buf_addr, subbuf_size, num_subbuf, | |
501 | switch_timer_interval, read_timer_interval); | |
f3d01b96 MD |
502 | if (!chan->chan) |
503 | goto create_error; | |
3c997079 | 504 | chan->tstate = 1; |
e64957da | 505 | chan->enabled = 1; |
a33c9927 | 506 | chan->transport = transport; |
d83004aa | 507 | chan->channel_type = channel_type; |
4e3c1b9b MD |
508 | list_add(&chan->list, &session->chan); |
509 | mutex_unlock(&sessions_mutex); | |
510 | return chan; | |
511 | ||
f3d01b96 MD |
512 | create_error: |
513 | kfree(chan); | |
c0e31d2e | 514 | nomem: |
a33c9927 MD |
515 | if (transport) |
516 | module_put(transport->owner); | |
c0e31d2e | 517 | notransport: |
e5382b6d | 518 | active: |
4e3c1b9b MD |
519 | mutex_unlock(&sessions_mutex); |
520 | return NULL; | |
521 | } | |
522 | ||
523 | /* | |
d83004aa JD |
524 | * Only used internally at session destruction for per-cpu channels, and |
525 | * when metadata channel is released. | |
526 | * Needs to be called with sessions mutex held. | |
4e3c1b9b | 527 | */ |
aa7c23a9 | 528 | static |
a90917c3 | 529 | void _lttng_channel_destroy(struct lttng_channel *chan) |
4e3c1b9b | 530 | { |
11b5a3c2 | 531 | chan->ops->channel_destroy(chan->chan); |
a33c9927 | 532 | module_put(chan->transport->owner); |
4e3c1b9b | 533 | list_del(&chan->list); |
8070f5c0 | 534 | lttng_destroy_context(chan->ctx); |
4e3c1b9b MD |
535 | kfree(chan); |
536 | } | |
537 | ||
d83004aa JD |
538 | void lttng_metadata_channel_destroy(struct lttng_channel *chan) |
539 | { | |
540 | BUG_ON(chan->channel_type != METADATA_CHANNEL); | |
541 | ||
542 | /* Protect the metadata cache with the sessions_mutex. */ | |
543 | mutex_lock(&sessions_mutex); | |
544 | _lttng_channel_destroy(chan); | |
545 | mutex_unlock(&sessions_mutex); | |
546 | } | |
547 | EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy); | |
548 | ||
549 | static | |
550 | void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream) | |
551 | { | |
552 | stream->finalized = 1; | |
553 | wake_up_interruptible(&stream->read_wait); | |
554 | } | |
555 | ||
e5382b6d MD |
556 | /* |
557 | * Supports event creation while tracing session is active. | |
3c997079 | 558 | * Needs to be called with sessions mutex held. |
e5382b6d | 559 | */ |
3c997079 MD |
560 | struct lttng_event *_lttng_event_create(struct lttng_channel *chan, |
561 | struct lttng_kernel_event *event_param, | |
562 | void *filter, | |
563 | const struct lttng_event_desc *event_desc, | |
564 | enum lttng_kernel_instrumentation itype) | |
4e3c1b9b | 565 | { |
3c997079 | 566 | struct lttng_session *session = chan->session; |
a90917c3 | 567 | struct lttng_event *event; |
3c997079 MD |
568 | const char *event_name; |
569 | struct hlist_head *head; | |
570 | size_t name_len; | |
571 | uint32_t hash; | |
3d084699 | 572 | int ret; |
4e3c1b9b | 573 | |
abc0446a | 574 | if (chan->free_event_id == -1U) { |
4cf0bf51 | 575 | ret = -EMFILE; |
e5382b6d | 576 | goto full; |
abc0446a | 577 | } |
3c997079 MD |
578 | |
579 | switch (itype) { | |
580 | case LTTNG_KERNEL_TRACEPOINT: | |
581 | event_name = event_desc->name; | |
582 | break; | |
583 | case LTTNG_KERNEL_KPROBE: | |
149b9a9d | 584 | case LTTNG_KERNEL_UPROBE: |
3c997079 | 585 | case LTTNG_KERNEL_KRETPROBE: |
3c997079 | 586 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 587 | case LTTNG_KERNEL_SYSCALL: |
3c997079 MD |
588 | event_name = event_param->name; |
589 | break; | |
e884017c | 590 | case LTTNG_KERNEL_FUNCTION: /* Fall-through. */ |
3c997079 MD |
591 | default: |
592 | WARN_ON_ONCE(1); | |
593 | ret = -EINVAL; | |
594 | goto type_error; | |
595 | } | |
596 | name_len = strlen(event_name); | |
597 | hash = jhash(event_name, name_len, 0); | |
598 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
3bc8535a | 599 | hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
600 | WARN_ON_ONCE(!event->desc); |
601 | if (!strncmp(event->desc->name, event_name, | |
602 | LTTNG_KERNEL_SYM_NAME_LEN - 1) | |
603 | && chan == event->chan) { | |
604 | ret = -EEXIST; | |
605 | goto exist; | |
abc0446a MD |
606 | } |
607 | } | |
3c997079 | 608 | |
11b5a3c2 | 609 | event = kmem_cache_zalloc(event_cache, GFP_KERNEL); |
abc0446a | 610 | if (!event) { |
4cf0bf51 | 611 | ret = -ENOMEM; |
4e3c1b9b | 612 | goto cache_error; |
abc0446a | 613 | } |
4e3c1b9b MD |
614 | event->chan = chan; |
615 | event->filter = filter; | |
e5382b6d | 616 | event->id = chan->free_event_id++; |
3c997079 MD |
617 | event->instrumentation = itype; |
618 | event->evtype = LTTNG_TYPE_EVENT; | |
07dfc1d0 | 619 | INIT_LIST_HEAD(&event->bytecode_runtime_head); |
3c997079 MD |
620 | INIT_LIST_HEAD(&event->enablers_ref_head); |
621 | ||
622 | switch (itype) { | |
ab2277d6 | 623 | case LTTNG_KERNEL_TRACEPOINT: |
3c997079 MD |
624 | /* Event will be enabled by enabler sync. */ |
625 | event->enabled = 0; | |
626 | event->registered = 0; | |
627 | event->desc = lttng_event_get(event_name); | |
abc0446a | 628 | if (!event->desc) { |
4cf0bf51 | 629 | ret = -ENOENT; |
d3dbe23c | 630 | goto register_error; |
abc0446a | 631 | } |
3c997079 MD |
632 | /* Populate lttng_event structure before event registration. */ |
633 | smp_wmb(); | |
baf20995 | 634 | break; |
ab2277d6 | 635 | case LTTNG_KERNEL_KPROBE: |
a0493bef MD |
636 | /* |
637 | * Needs to be explicitly enabled after creation, since | |
638 | * we may want to apply filters. | |
639 | */ | |
640 | event->enabled = 0; | |
3c997079 MD |
641 | event->registered = 1; |
642 | /* | |
643 | * Populate lttng_event structure before event | |
644 | * registration. | |
645 | */ | |
646 | smp_wmb(); | |
647 | ret = lttng_kprobes_register(event_name, | |
f17701fb MD |
648 | event_param->u.kprobe.symbol_name, |
649 | event_param->u.kprobe.offset, | |
650 | event_param->u.kprobe.addr, | |
651 | event); | |
abc0446a | 652 | if (ret) { |
4cf0bf51 | 653 | ret = -EINVAL; |
d6d808f3 | 654 | goto register_error; |
abc0446a | 655 | } |
edeb3137 MD |
656 | ret = try_module_get(event->desc->owner); |
657 | WARN_ON_ONCE(!ret); | |
d6d808f3 | 658 | break; |
7371f44c MD |
659 | case LTTNG_KERNEL_KRETPROBE: |
660 | { | |
a90917c3 | 661 | struct lttng_event *event_return; |
7371f44c MD |
662 | |
663 | /* kretprobe defines 2 events */ | |
a0493bef MD |
664 | /* |
665 | * Needs to be explicitly enabled after creation, since | |
666 | * we may want to apply filters. | |
667 | */ | |
668 | event->enabled = 0; | |
3c997079 | 669 | event->registered = 1; |
7371f44c MD |
670 | event_return = |
671 | kmem_cache_zalloc(event_cache, GFP_KERNEL); | |
abc0446a | 672 | if (!event_return) { |
4cf0bf51 | 673 | ret = -ENOMEM; |
7371f44c | 674 | goto register_error; |
abc0446a | 675 | } |
7371f44c MD |
676 | event_return->chan = chan; |
677 | event_return->filter = filter; | |
678 | event_return->id = chan->free_event_id++; | |
a0493bef | 679 | event_return->enabled = 0; |
3c997079 MD |
680 | event_return->registered = 1; |
681 | event_return->instrumentation = itype; | |
7371f44c | 682 | /* |
a90917c3 | 683 | * Populate lttng_event structure before kretprobe registration. |
7371f44c MD |
684 | */ |
685 | smp_wmb(); | |
3c997079 | 686 | ret = lttng_kretprobes_register(event_name, |
7371f44c MD |
687 | event_param->u.kretprobe.symbol_name, |
688 | event_param->u.kretprobe.offset, | |
689 | event_param->u.kretprobe.addr, | |
690 | event, event_return); | |
691 | if (ret) { | |
692 | kmem_cache_free(event_cache, event_return); | |
4cf0bf51 | 693 | ret = -EINVAL; |
7371f44c MD |
694 | goto register_error; |
695 | } | |
696 | /* Take 2 refs on the module: one per event. */ | |
697 | ret = try_module_get(event->desc->owner); | |
698 | WARN_ON_ONCE(!ret); | |
699 | ret = try_module_get(event->desc->owner); | |
700 | WARN_ON_ONCE(!ret); | |
a90917c3 | 701 | ret = _lttng_event_metadata_statedump(chan->session, chan, |
7371f44c | 702 | event_return); |
abc0446a | 703 | WARN_ON_ONCE(ret > 0); |
7371f44c MD |
704 | if (ret) { |
705 | kmem_cache_free(event_cache, event_return); | |
706 | module_put(event->desc->owner); | |
707 | module_put(event->desc->owner); | |
708 | goto statedump_error; | |
709 | } | |
710 | list_add(&event_return->list, &chan->session->events); | |
711 | break; | |
712 | } | |
1ec65de1 | 713 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 714 | case LTTNG_KERNEL_SYSCALL: |
a0493bef MD |
715 | /* |
716 | * Needs to be explicitly enabled after creation, since | |
717 | * we may want to apply filters. | |
718 | */ | |
719 | event->enabled = 0; | |
3c997079 MD |
720 | event->registered = 0; |
721 | event->desc = event_desc; | |
abc0446a | 722 | if (!event->desc) { |
4cf0bf51 | 723 | ret = -EINVAL; |
259b6cb3 | 724 | goto register_error; |
abc0446a | 725 | } |
1ec65de1 | 726 | break; |
149b9a9d | 727 | case LTTNG_KERNEL_UPROBE: |
a344f64b FD |
728 | /* |
729 | * Needs to be explicitly enabled after creation, since | |
730 | * we may want to apply filters. | |
731 | */ | |
732 | event->enabled = 0; | |
733 | event->registered = 1; | |
3aed4dca | 734 | |
a344f64b FD |
735 | /* |
736 | * Populate lttng_event structure before event | |
737 | * registration. | |
738 | */ | |
739 | smp_wmb(); | |
149b9a9d YB |
740 | |
741 | ret = lttng_uprobes_register(event_param->name, | |
56377c91 | 742 | event_param->u.uprobe.fd, |
149b9a9d YB |
743 | event); |
744 | if (ret) | |
745 | goto register_error; | |
746 | ret = try_module_get(event->desc->owner); | |
747 | WARN_ON_ONCE(!ret); | |
748 | break; | |
e884017c | 749 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
750 | default: |
751 | WARN_ON_ONCE(1); | |
4cf0bf51 | 752 | ret = -EINVAL; |
df07930b | 753 | goto register_error; |
baf20995 | 754 | } |
a90917c3 | 755 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
abc0446a MD |
756 | WARN_ON_ONCE(ret > 0); |
757 | if (ret) { | |
c099397a | 758 | goto statedump_error; |
abc0446a | 759 | } |
3c997079 | 760 | hlist_add_head(&event->hlist, head); |
dda6a249 | 761 | list_add(&event->list, &chan->session->events); |
4e3c1b9b MD |
762 | return event; |
763 | ||
c099397a | 764 | statedump_error: |
259b6cb3 | 765 | /* If a statedump error occurs, events will not be readable. */ |
11b5a3c2 | 766 | register_error: |
11b5a3c2 | 767 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
768 | cache_error: |
769 | exist: | |
3c997079 | 770 | type_error: |
e5382b6d | 771 | full: |
4cf0bf51 | 772 | return ERR_PTR(ret); |
4e3c1b9b MD |
773 | } |
774 | ||
3c997079 MD |
775 | struct lttng_event *lttng_event_create(struct lttng_channel *chan, |
776 | struct lttng_kernel_event *event_param, | |
777 | void *filter, | |
778 | const struct lttng_event_desc *event_desc, | |
779 | enum lttng_kernel_instrumentation itype) | |
780 | { | |
781 | struct lttng_event *event; | |
782 | ||
783 | mutex_lock(&sessions_mutex); | |
784 | event = _lttng_event_create(chan, event_param, filter, event_desc, | |
785 | itype); | |
786 | mutex_unlock(&sessions_mutex); | |
787 | return event; | |
788 | } | |
789 | ||
790 | /* Only used for tracepoints for now. */ | |
791 | static | |
792 | void register_event(struct lttng_event *event) | |
793 | { | |
794 | const struct lttng_event_desc *desc; | |
f127e61e | 795 | int ret = -EINVAL; |
3c997079 | 796 | |
3c997079 MD |
797 | if (event->registered) |
798 | return; | |
4ecb5ad5 | 799 | |
3c997079 | 800 | desc = event->desc; |
4ecb5ad5 MD |
801 | switch (event->instrumentation) { |
802 | case LTTNG_KERNEL_TRACEPOINT: | |
0d260d3d MD |
803 | ret = lttng_tracepoint_probe_register(desc->kname, |
804 | desc->probe_callback, | |
805 | event); | |
4ecb5ad5 MD |
806 | break; |
807 | case LTTNG_KERNEL_SYSCALL: | |
808 | ret = lttng_syscall_filter_enable(event->chan, | |
809 | desc->name); | |
810 | break; | |
811 | case LTTNG_KERNEL_KPROBE: | |
a344f64b | 812 | case LTTNG_KERNEL_UPROBE: |
4ecb5ad5 | 813 | case LTTNG_KERNEL_KRETPROBE: |
4ecb5ad5 MD |
814 | case LTTNG_KERNEL_NOOP: |
815 | ret = 0; | |
816 | break; | |
e884017c | 817 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
4ecb5ad5 MD |
818 | default: |
819 | WARN_ON_ONCE(1); | |
820 | } | |
3c997079 MD |
821 | if (!ret) |
822 | event->registered = 1; | |
823 | } | |
824 | ||
4e3c1b9b MD |
825 | /* |
826 | * Only used internally at session destruction. | |
827 | */ | |
a90917c3 | 828 | int _lttng_event_unregister(struct lttng_event *event) |
4e3c1b9b | 829 | { |
4ecb5ad5 | 830 | const struct lttng_event_desc *desc; |
11b5a3c2 MD |
831 | int ret = -EINVAL; |
832 | ||
3c997079 MD |
833 | if (!event->registered) |
834 | return 0; | |
835 | ||
4ecb5ad5 | 836 | desc = event->desc; |
38d024ae | 837 | switch (event->instrumentation) { |
ab2277d6 | 838 | case LTTNG_KERNEL_TRACEPOINT: |
0d260d3d | 839 | ret = lttng_tracepoint_probe_unregister(event->desc->kname, |
85a9ca7f | 840 | event->desc->probe_callback, |
11b5a3c2 | 841 | event); |
baf20995 | 842 | break; |
ab2277d6 | 843 | case LTTNG_KERNEL_KPROBE: |
f17701fb | 844 | lttng_kprobes_unregister(event); |
d6d808f3 MD |
845 | ret = 0; |
846 | break; | |
7371f44c MD |
847 | case LTTNG_KERNEL_KRETPROBE: |
848 | lttng_kretprobes_unregister(event); | |
849 | ret = 0; | |
850 | break; | |
33a39a3c | 851 | case LTTNG_KERNEL_SYSCALL: |
4ecb5ad5 MD |
852 | ret = lttng_syscall_filter_disable(event->chan, |
853 | desc->name); | |
854 | break; | |
855 | case LTTNG_KERNEL_NOOP: | |
259b6cb3 MD |
856 | ret = 0; |
857 | break; | |
149b9a9d YB |
858 | case LTTNG_KERNEL_UPROBE: |
859 | lttng_uprobes_unregister(event); | |
860 | ret = 0; | |
861 | break; | |
e884017c | 862 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
baf20995 MD |
863 | default: |
864 | WARN_ON_ONCE(1); | |
865 | } | |
3c997079 MD |
866 | if (!ret) |
867 | event->registered = 0; | |
dda6a249 MD |
868 | return ret; |
869 | } | |
870 | ||
871 | /* | |
872 | * Only used internally at session destruction. | |
873 | */ | |
be066e6c | 874 | static |
a90917c3 | 875 | void _lttng_event_destroy(struct lttng_event *event) |
dda6a249 | 876 | { |
edeb3137 MD |
877 | switch (event->instrumentation) { |
878 | case LTTNG_KERNEL_TRACEPOINT: | |
a90917c3 | 879 | lttng_event_put(event->desc); |
edeb3137 MD |
880 | break; |
881 | case LTTNG_KERNEL_KPROBE: | |
882 | module_put(event->desc->owner); | |
883 | lttng_kprobes_destroy_private(event); | |
884 | break; | |
7371f44c MD |
885 | case LTTNG_KERNEL_KRETPROBE: |
886 | module_put(event->desc->owner); | |
887 | lttng_kretprobes_destroy_private(event); | |
888 | break; | |
259b6cb3 | 889 | case LTTNG_KERNEL_NOOP: |
33a39a3c | 890 | case LTTNG_KERNEL_SYSCALL: |
259b6cb3 | 891 | break; |
149b9a9d YB |
892 | case LTTNG_KERNEL_UPROBE: |
893 | module_put(event->desc->owner); | |
894 | lttng_uprobes_destroy_private(event); | |
895 | break; | |
e884017c | 896 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
edeb3137 MD |
897 | default: |
898 | WARN_ON_ONCE(1); | |
899 | } | |
dda6a249 | 900 | list_del(&event->list); |
8070f5c0 | 901 | lttng_destroy_context(event->ctx); |
11b5a3c2 | 902 | kmem_cache_free(event_cache, event); |
4e3c1b9b MD |
903 | } |
904 | ||
d1f652f8 MD |
905 | struct lttng_id_tracker *get_tracker(struct lttng_session *session, |
906 | enum tracker_type tracker_type) | |
e0130fab | 907 | { |
d1f652f8 MD |
908 | switch (tracker_type) { |
909 | case TRACKER_PID: | |
910 | return &session->pid_tracker; | |
911 | case TRACKER_VPID: | |
912 | return &session->vpid_tracker; | |
913 | case TRACKER_UID: | |
914 | return &session->uid_tracker; | |
915 | case TRACKER_VUID: | |
916 | return &session->vuid_tracker; | |
917 | case TRACKER_GID: | |
918 | return &session->gid_tracker; | |
919 | case TRACKER_VGID: | |
920 | return &session->vgid_tracker; | |
921 | default: | |
922 | WARN_ON_ONCE(1); | |
923 | return NULL; | |
924 | } | |
925 | } | |
926 | ||
927 | int lttng_session_track_id(struct lttng_session *session, | |
928 | enum tracker_type tracker_type, int id) | |
929 | { | |
930 | struct lttng_id_tracker *tracker; | |
e0130fab MD |
931 | int ret; |
932 | ||
d1f652f8 MD |
933 | tracker = get_tracker(session, tracker_type); |
934 | if (!tracker) | |
935 | return -EINVAL; | |
936 | if (id < -1) | |
e0130fab MD |
937 | return -EINVAL; |
938 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
939 | if (id == -1) { |
940 | /* track all ids: destroy tracker. */ | |
941 | lttng_id_tracker_destroy(tracker, true); | |
e0130fab MD |
942 | ret = 0; |
943 | } else { | |
d1f652f8 | 944 | ret = lttng_id_tracker_add(tracker, id); |
e0130fab | 945 | } |
e0130fab MD |
946 | mutex_unlock(&sessions_mutex); |
947 | return ret; | |
948 | } | |
949 | ||
d1f652f8 MD |
950 | int lttng_session_untrack_id(struct lttng_session *session, |
951 | enum tracker_type tracker_type, int id) | |
e0130fab | 952 | { |
d1f652f8 | 953 | struct lttng_id_tracker *tracker; |
e0130fab MD |
954 | int ret; |
955 | ||
d1f652f8 MD |
956 | tracker = get_tracker(session, tracker_type); |
957 | if (!tracker) | |
958 | return -EINVAL; | |
959 | if (id < -1) | |
e0130fab MD |
960 | return -EINVAL; |
961 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
962 | if (id == -1) { |
963 | /* untrack all ids: replace by empty tracker. */ | |
964 | ret = lttng_id_tracker_empty_set(tracker); | |
e0130fab | 965 | } else { |
d1f652f8 | 966 | ret = lttng_id_tracker_del(tracker, id); |
e0130fab | 967 | } |
e0130fab MD |
968 | mutex_unlock(&sessions_mutex); |
969 | return ret; | |
970 | } | |
971 | ||
7e6f9ef6 | 972 | static |
d1f652f8 | 973 | void *id_list_start(struct seq_file *m, loff_t *pos) |
7e6f9ef6 | 974 | { |
d1f652f8 MD |
975 | struct lttng_id_tracker *id_tracker = m->private; |
976 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
977 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
978 | int iter = 0, i; |
979 | ||
980 | mutex_lock(&sessions_mutex); | |
d1f652f8 MD |
981 | if (id_tracker_p) { |
982 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
983 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 984 | |
3bc8535a | 985 | hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
986 | if (iter++ >= *pos) |
987 | return e; | |
988 | } | |
989 | } | |
990 | } else { | |
d1f652f8 | 991 | /* ID tracker disabled. */ |
7e6f9ef6 | 992 | if (iter >= *pos && iter == 0) { |
d1f652f8 | 993 | return id_tracker_p; /* empty tracker */ |
7e6f9ef6 MD |
994 | } |
995 | iter++; | |
996 | } | |
997 | /* End of list */ | |
998 | return NULL; | |
999 | } | |
1000 | ||
1001 | /* Called with sessions_mutex held. */ | |
1002 | static | |
d1f652f8 | 1003 | void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) |
7e6f9ef6 | 1004 | { |
d1f652f8 MD |
1005 | struct lttng_id_tracker *id_tracker = m->private; |
1006 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1007 | struct lttng_id_hash_node *e; | |
7e6f9ef6 MD |
1008 | int iter = 0, i; |
1009 | ||
1010 | (*ppos)++; | |
d1f652f8 MD |
1011 | if (id_tracker_p) { |
1012 | for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) { | |
1013 | struct hlist_head *head = &id_tracker_p->id_hash[i]; | |
7e6f9ef6 | 1014 | |
3bc8535a | 1015 | hlist_for_each_entry(e, head, hlist) { |
7e6f9ef6 MD |
1016 | if (iter++ >= *ppos) |
1017 | return e; | |
1018 | } | |
1019 | } | |
1020 | } else { | |
d1f652f8 | 1021 | /* ID tracker disabled. */ |
7e6f9ef6 | 1022 | if (iter >= *ppos && iter == 0) |
d1f652f8 | 1023 | return p; /* empty tracker */ |
7e6f9ef6 MD |
1024 | iter++; |
1025 | } | |
1026 | ||
1027 | /* End of list */ | |
1028 | return NULL; | |
1029 | } | |
1030 | ||
1031 | static | |
d1f652f8 | 1032 | void id_list_stop(struct seq_file *m, void *p) |
7e6f9ef6 MD |
1033 | { |
1034 | mutex_unlock(&sessions_mutex); | |
1035 | } | |
1036 | ||
1037 | static | |
d1f652f8 | 1038 | int id_list_show(struct seq_file *m, void *p) |
7e6f9ef6 | 1039 | { |
d1f652f8 MD |
1040 | struct lttng_id_tracker *id_tracker = m->private; |
1041 | struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; | |
1042 | int id; | |
7e6f9ef6 | 1043 | |
d1f652f8 | 1044 | if (p == id_tracker_p) { |
7e6f9ef6 | 1045 | /* Tracker disabled. */ |
d1f652f8 | 1046 | id = -1; |
7e6f9ef6 | 1047 | } else { |
d1f652f8 | 1048 | const struct lttng_id_hash_node *e = p; |
7e6f9ef6 | 1049 | |
d1f652f8 MD |
1050 | id = lttng_id_tracker_get_node_id(e); |
1051 | } | |
1052 | switch (id_tracker->tracker_type) { | |
1053 | case TRACKER_PID: | |
1054 | seq_printf(m, "process { pid = %d; };\n", id); | |
1055 | break; | |
1056 | case TRACKER_VPID: | |
1057 | seq_printf(m, "process { vpid = %d; };\n", id); | |
1058 | break; | |
1059 | case TRACKER_UID: | |
1060 | seq_printf(m, "user { uid = %d; };\n", id); | |
1061 | break; | |
1062 | case TRACKER_VUID: | |
1063 | seq_printf(m, "user { vuid = %d; };\n", id); | |
1064 | break; | |
1065 | case TRACKER_GID: | |
1066 | seq_printf(m, "group { gid = %d; };\n", id); | |
1067 | break; | |
1068 | case TRACKER_VGID: | |
1069 | seq_printf(m, "group { vgid = %d; };\n", id); | |
1070 | break; | |
1071 | default: | |
1072 | seq_printf(m, "UNKNOWN { field = %d };\n", id); | |
7e6f9ef6 | 1073 | } |
7e6f9ef6 MD |
1074 | return 0; |
1075 | } | |
1076 | ||
1077 | static | |
d1f652f8 MD |
1078 | const struct seq_operations lttng_tracker_ids_list_seq_ops = { |
1079 | .start = id_list_start, | |
1080 | .next = id_list_next, | |
1081 | .stop = id_list_stop, | |
1082 | .show = id_list_show, | |
7e6f9ef6 MD |
1083 | }; |
1084 | ||
1085 | static | |
d1f652f8 | 1086 | int lttng_tracker_ids_list_open(struct inode *inode, struct file *file) |
7e6f9ef6 | 1087 | { |
d1f652f8 | 1088 | return seq_open(file, <tng_tracker_ids_list_seq_ops); |
7e6f9ef6 MD |
1089 | } |
1090 | ||
1091 | static | |
d1f652f8 | 1092 | int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) |
7e6f9ef6 MD |
1093 | { |
1094 | struct seq_file *m = file->private_data; | |
d1f652f8 | 1095 | struct lttng_id_tracker *id_tracker = m->private; |
7e6f9ef6 MD |
1096 | int ret; |
1097 | ||
d1f652f8 | 1098 | WARN_ON_ONCE(!id_tracker); |
7e6f9ef6 | 1099 | ret = seq_release(inode, file); |
d1f652f8 MD |
1100 | if (!ret) |
1101 | fput(id_tracker->session->file); | |
7e6f9ef6 MD |
1102 | return ret; |
1103 | } | |
1104 | ||
d1f652f8 | 1105 | const struct file_operations lttng_tracker_ids_list_fops = { |
7e6f9ef6 | 1106 | .owner = THIS_MODULE, |
d1f652f8 | 1107 | .open = lttng_tracker_ids_list_open, |
7e6f9ef6 MD |
1108 | .read = seq_read, |
1109 | .llseek = seq_lseek, | |
d1f652f8 | 1110 | .release = lttng_tracker_ids_list_release, |
7e6f9ef6 MD |
1111 | }; |
1112 | ||
d1f652f8 MD |
1113 | int lttng_session_list_tracker_ids(struct lttng_session *session, |
1114 | enum tracker_type tracker_type) | |
7e6f9ef6 | 1115 | { |
d1f652f8 | 1116 | struct file *tracker_ids_list_file; |
7e6f9ef6 MD |
1117 | struct seq_file *m; |
1118 | int file_fd, ret; | |
1119 | ||
34522739 | 1120 | file_fd = get_unused_fd_flags(0); |
7e6f9ef6 MD |
1121 | if (file_fd < 0) { |
1122 | ret = file_fd; | |
1123 | goto fd_error; | |
1124 | } | |
1125 | ||
d1f652f8 MD |
1126 | tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]", |
1127 | <tng_tracker_ids_list_fops, | |
7e6f9ef6 | 1128 | NULL, O_RDWR); |
d1f652f8 MD |
1129 | if (IS_ERR(tracker_ids_list_file)) { |
1130 | ret = PTR_ERR(tracker_ids_list_file); | |
7e6f9ef6 MD |
1131 | goto file_error; |
1132 | } | |
98d7281c MJ |
1133 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { |
1134 | ret = -EOVERFLOW; | |
9c1f4643 MD |
1135 | goto refcount_error; |
1136 | } | |
d1f652f8 | 1137 | ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file); |
7e6f9ef6 MD |
1138 | if (ret < 0) |
1139 | goto open_error; | |
d1f652f8 MD |
1140 | m = tracker_ids_list_file->private_data; |
1141 | ||
1142 | m->private = get_tracker(session, tracker_type); | |
1143 | BUG_ON(!m->private); | |
1144 | fd_install(file_fd, tracker_ids_list_file); | |
7e6f9ef6 MD |
1145 | |
1146 | return file_fd; | |
1147 | ||
1148 | open_error: | |
9c1f4643 MD |
1149 | atomic_long_dec(&session->file->f_count); |
1150 | refcount_error: | |
d1f652f8 | 1151 | fput(tracker_ids_list_file); |
7e6f9ef6 MD |
1152 | file_error: |
1153 | put_unused_fd(file_fd); | |
1154 | fd_error: | |
1155 | return ret; | |
1156 | } | |
1157 | ||
3c997079 MD |
1158 | /* |
1159 | * Enabler management. | |
1160 | */ | |
1161 | static | |
4993071a PP |
1162 | int lttng_match_enabler_star_glob(const char *desc_name, |
1163 | const char *pattern) | |
3c997079 | 1164 | { |
48ccd619 MD |
1165 | if (!strutils_star_glob_match(pattern, SIZE_MAX, |
1166 | desc_name, SIZE_MAX)) | |
3c997079 MD |
1167 | return 0; |
1168 | return 1; | |
1169 | } | |
1170 | ||
1171 | static | |
4ecb5ad5 MD |
1172 | int lttng_match_enabler_name(const char *desc_name, |
1173 | const char *name) | |
3c997079 | 1174 | { |
4ecb5ad5 | 1175 | if (strcmp(desc_name, name)) |
3c997079 MD |
1176 | return 0; |
1177 | return 1; | |
1178 | } | |
1179 | ||
1180 | static | |
1181 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1182 | struct lttng_enabler *enabler) | |
1183 | { | |
4ecb5ad5 MD |
1184 | const char *desc_name, *enabler_name; |
1185 | ||
1186 | enabler_name = enabler->event_param.name; | |
1187 | switch (enabler->event_param.instrumentation) { | |
1188 | case LTTNG_KERNEL_TRACEPOINT: | |
1189 | desc_name = desc->name; | |
1190 | break; | |
1191 | case LTTNG_KERNEL_SYSCALL: | |
1192 | desc_name = desc->name; | |
1193 | if (!strncmp(desc_name, "compat_", strlen("compat_"))) | |
1194 | desc_name += strlen("compat_"); | |
1195 | if (!strncmp(desc_name, "syscall_exit_", | |
1196 | strlen("syscall_exit_"))) { | |
1197 | desc_name += strlen("syscall_exit_"); | |
1198 | } else if (!strncmp(desc_name, "syscall_entry_", | |
1199 | strlen("syscall_entry_"))) { | |
1200 | desc_name += strlen("syscall_entry_"); | |
1201 | } else { | |
1202 | WARN_ON_ONCE(1); | |
1203 | return -EINVAL; | |
1204 | } | |
1205 | break; | |
1206 | default: | |
1207 | WARN_ON_ONCE(1); | |
1208 | return -EINVAL; | |
1209 | } | |
3c997079 | 1210 | switch (enabler->type) { |
4993071a PP |
1211 | case LTTNG_ENABLER_STAR_GLOB: |
1212 | return lttng_match_enabler_star_glob(desc_name, enabler_name); | |
3c997079 | 1213 | case LTTNG_ENABLER_NAME: |
4ecb5ad5 | 1214 | return lttng_match_enabler_name(desc_name, enabler_name); |
3c997079 MD |
1215 | default: |
1216 | return -EINVAL; | |
1217 | } | |
1218 | } | |
1219 | ||
1220 | static | |
1221 | int lttng_event_match_enabler(struct lttng_event *event, | |
1222 | struct lttng_enabler *enabler) | |
1223 | { | |
33a39a3c MD |
1224 | if (enabler->event_param.instrumentation != event->instrumentation) |
1225 | return 0; | |
3c997079 MD |
1226 | if (lttng_desc_match_enabler(event->desc, enabler) |
1227 | && event->chan == enabler->chan) | |
1228 | return 1; | |
1229 | else | |
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | static | |
1234 | struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event, | |
1235 | struct lttng_enabler *enabler) | |
1236 | { | |
1237 | struct lttng_enabler_ref *enabler_ref; | |
1238 | ||
1239 | list_for_each_entry(enabler_ref, | |
1240 | &event->enablers_ref_head, node) { | |
1241 | if (enabler_ref->ref == enabler) | |
1242 | return enabler_ref; | |
1243 | } | |
1244 | return NULL; | |
1245 | } | |
1246 | ||
3c997079 | 1247 | static |
33a39a3c | 1248 | void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler) |
3c997079 MD |
1249 | { |
1250 | struct lttng_session *session = enabler->chan->session; | |
1251 | struct lttng_probe_desc *probe_desc; | |
1252 | const struct lttng_event_desc *desc; | |
1253 | int i; | |
1254 | struct list_head *probe_list; | |
1255 | ||
1256 | probe_list = lttng_get_probe_list_head(); | |
1257 | /* | |
1258 | * For each probe event, if we find that a probe event matches | |
1259 | * our enabler, create an associated lttng_event if not | |
1260 | * already present. | |
1261 | */ | |
1262 | list_for_each_entry(probe_desc, probe_list, head) { | |
1263 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1264 | int found = 0; | |
1265 | struct hlist_head *head; | |
1266 | const char *event_name; | |
1267 | size_t name_len; | |
1268 | uint32_t hash; | |
1269 | struct lttng_event *event; | |
1270 | ||
1271 | desc = probe_desc->event_desc[i]; | |
1272 | if (!lttng_desc_match_enabler(desc, enabler)) | |
1273 | continue; | |
1274 | event_name = desc->name; | |
1275 | name_len = strlen(event_name); | |
1276 | ||
1277 | /* | |
1278 | * Check if already created. | |
1279 | */ | |
1280 | hash = jhash(event_name, name_len, 0); | |
1281 | head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)]; | |
3bc8535a | 1282 | hlist_for_each_entry(event, head, hlist) { |
3c997079 MD |
1283 | if (event->desc == desc |
1284 | && event->chan == enabler->chan) | |
1285 | found = 1; | |
1286 | } | |
1287 | if (found) | |
1288 | continue; | |
1289 | ||
1290 | /* | |
1291 | * We need to create an event for this | |
1292 | * event probe. | |
1293 | */ | |
1294 | event = _lttng_event_create(enabler->chan, | |
1295 | NULL, NULL, desc, | |
1296 | LTTNG_KERNEL_TRACEPOINT); | |
1297 | if (!event) { | |
1298 | printk(KERN_INFO "Unable to create event %s\n", | |
1299 | probe_desc->event_desc[i]->name); | |
1300 | } | |
1301 | } | |
1302 | } | |
1303 | } | |
1304 | ||
33a39a3c MD |
1305 | static |
1306 | void lttng_create_syscall_if_missing(struct lttng_enabler *enabler) | |
1307 | { | |
1308 | int ret; | |
1309 | ||
1310 | ret = lttng_syscalls_register(enabler->chan, NULL); | |
1311 | WARN_ON_ONCE(ret); | |
1312 | } | |
1313 | ||
1314 | /* | |
1315 | * Create struct lttng_event if it is missing and present in the list of | |
1316 | * tracepoint probes. | |
1317 | * Should be called with sessions mutex held. | |
1318 | */ | |
1319 | static | |
1320 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
1321 | { | |
1322 | switch (enabler->event_param.instrumentation) { | |
1323 | case LTTNG_KERNEL_TRACEPOINT: | |
1324 | lttng_create_tracepoint_if_missing(enabler); | |
1325 | break; | |
1326 | case LTTNG_KERNEL_SYSCALL: | |
1327 | lttng_create_syscall_if_missing(enabler); | |
1328 | break; | |
1329 | default: | |
1330 | WARN_ON_ONCE(1); | |
1331 | break; | |
1332 | } | |
1333 | } | |
1334 | ||
3c997079 MD |
1335 | /* |
1336 | * Create events associated with an enabler (if not already present), | |
1337 | * and add backward reference from the event to the enabler. | |
1338 | * Should be called with sessions mutex held. | |
1339 | */ | |
1340 | static | |
1341 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) | |
1342 | { | |
1343 | struct lttng_session *session = enabler->chan->session; | |
1344 | struct lttng_event *event; | |
1345 | ||
1346 | /* First ensure that probe events are created for this enabler. */ | |
1347 | lttng_create_event_if_missing(enabler); | |
1348 | ||
1349 | /* For each event matching enabler in session event list. */ | |
1350 | list_for_each_entry(event, &session->events, list) { | |
1351 | struct lttng_enabler_ref *enabler_ref; | |
1352 | ||
1353 | if (!lttng_event_match_enabler(event, enabler)) | |
1354 | continue; | |
1355 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
1356 | if (!enabler_ref) { | |
1357 | /* | |
1358 | * If no backward ref, create it. | |
1359 | * Add backward ref from event to enabler. | |
1360 | */ | |
1361 | enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL); | |
1362 | if (!enabler_ref) | |
1363 | return -ENOMEM; | |
1364 | enabler_ref->ref = enabler; | |
1365 | list_add(&enabler_ref->node, | |
1366 | &event->enablers_ref_head); | |
1367 | } | |
1368 | ||
f127e61e MD |
1369 | /* |
1370 | * Link filter bytecodes if not linked yet. | |
1371 | */ | |
1372 | lttng_enabler_event_link_bytecode(event, enabler); | |
1373 | ||
3c997079 MD |
1374 | /* TODO: merge event context. */ |
1375 | } | |
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | /* | |
1380 | * Called at module load: connect the probe on all enablers matching | |
1381 | * this event. | |
1382 | * Called with sessions lock held. | |
1383 | */ | |
1384 | int lttng_fix_pending_events(void) | |
1385 | { | |
1386 | struct lttng_session *session; | |
1387 | ||
1388 | list_for_each_entry(session, &sessions, list) | |
1389 | lttng_session_lazy_sync_enablers(session); | |
1390 | return 0; | |
1391 | } | |
1392 | ||
1393 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1394 | struct lttng_kernel_event *event_param, | |
1395 | struct lttng_channel *chan) | |
1396 | { | |
1397 | struct lttng_enabler *enabler; | |
1398 | ||
1399 | enabler = kzalloc(sizeof(*enabler), GFP_KERNEL); | |
1400 | if (!enabler) | |
1401 | return NULL; | |
1402 | enabler->type = type; | |
07dfc1d0 | 1403 | INIT_LIST_HEAD(&enabler->filter_bytecode_head); |
3c997079 MD |
1404 | memcpy(&enabler->event_param, event_param, |
1405 | sizeof(enabler->event_param)); | |
1406 | enabler->chan = chan; | |
1407 | /* ctx left NULL */ | |
4fd19d8a | 1408 | enabler->enabled = 0; |
3c997079 MD |
1409 | enabler->evtype = LTTNG_TYPE_ENABLER; |
1410 | mutex_lock(&sessions_mutex); | |
1411 | list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1412 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1413 | mutex_unlock(&sessions_mutex); | |
1414 | return enabler; | |
1415 | } | |
1416 | ||
1417 | int lttng_enabler_enable(struct lttng_enabler *enabler) | |
1418 | { | |
1419 | mutex_lock(&sessions_mutex); | |
1420 | enabler->enabled = 1; | |
1421 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1422 | mutex_unlock(&sessions_mutex); | |
1423 | return 0; | |
1424 | } | |
1425 | ||
1426 | int lttng_enabler_disable(struct lttng_enabler *enabler) | |
1427 | { | |
1428 | mutex_lock(&sessions_mutex); | |
1429 | enabler->enabled = 0; | |
1430 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1431 | mutex_unlock(&sessions_mutex); | |
1432 | return 0; | |
1433 | } | |
1434 | ||
07dfc1d0 MD |
1435 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1436 | struct lttng_kernel_filter_bytecode __user *bytecode) | |
1437 | { | |
1438 | struct lttng_filter_bytecode_node *bytecode_node; | |
1439 | uint32_t bytecode_len; | |
1440 | int ret; | |
1441 | ||
1442 | ret = get_user(bytecode_len, &bytecode->len); | |
1443 | if (ret) | |
1444 | return ret; | |
1445 | bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len, | |
1446 | GFP_KERNEL); | |
1447 | if (!bytecode_node) | |
1448 | return -ENOMEM; | |
1449 | ret = copy_from_user(&bytecode_node->bc, bytecode, | |
1450 | sizeof(*bytecode) + bytecode_len); | |
1451 | if (ret) | |
1452 | goto error_free; | |
1453 | bytecode_node->enabler = enabler; | |
1454 | /* Enforce length based on allocated size */ | |
1455 | bytecode_node->bc.len = bytecode_len; | |
1456 | list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head); | |
1457 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1458 | return 0; | |
1459 | ||
1460 | error_free: | |
1461 | kfree(bytecode_node); | |
1462 | return ret; | |
1463 | } | |
1464 | ||
3aed4dca FD |
1465 | int lttng_event_add_callsite(struct lttng_event *event, |
1466 | struct lttng_kernel_event_callsite __user *callsite) | |
1467 | { | |
1468 | ||
1469 | switch (event->instrumentation) { | |
1470 | case LTTNG_KERNEL_UPROBE: | |
1471 | return lttng_uprobes_add_callsite(event, callsite); | |
1472 | default: | |
1473 | return -EINVAL; | |
1474 | } | |
1475 | } | |
1476 | ||
3c997079 MD |
1477 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1478 | struct lttng_kernel_context *context_param) | |
1479 | { | |
1480 | return -ENOSYS; | |
1481 | } | |
1482 | ||
1483 | static | |
1484 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
1485 | { | |
07dfc1d0 MD |
1486 | struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node; |
1487 | ||
1488 | /* Destroy filter bytecode */ | |
1489 | list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1490 | &enabler->filter_bytecode_head, node) { | |
1491 | kfree(filter_node); | |
1492 | } | |
1493 | ||
3c997079 MD |
1494 | /* Destroy contexts */ |
1495 | lttng_destroy_context(enabler->ctx); | |
1496 | ||
1497 | list_del(&enabler->node); | |
1498 | kfree(enabler); | |
1499 | } | |
1500 | ||
1501 | /* | |
1502 | * lttng_session_sync_enablers should be called just before starting a | |
1503 | * session. | |
1504 | * Should be called with sessions mutex held. | |
1505 | */ | |
1506 | static | |
1507 | void lttng_session_sync_enablers(struct lttng_session *session) | |
1508 | { | |
1509 | struct lttng_enabler *enabler; | |
1510 | struct lttng_event *event; | |
1511 | ||
1512 | list_for_each_entry(enabler, &session->enablers_head, node) | |
1513 | lttng_enabler_ref_events(enabler); | |
1514 | /* | |
1515 | * For each event, if at least one of its enablers is enabled, | |
1516 | * and its channel and session transient states are enabled, we | |
1517 | * enable the event, else we disable it. | |
1518 | */ | |
1519 | list_for_each_entry(event, &session->events, list) { | |
1520 | struct lttng_enabler_ref *enabler_ref; | |
07dfc1d0 MD |
1521 | struct lttng_bytecode_runtime *runtime; |
1522 | int enabled = 0, has_enablers_without_bytecode = 0; | |
3c997079 | 1523 | |
4ecb5ad5 MD |
1524 | switch (event->instrumentation) { |
1525 | case LTTNG_KERNEL_TRACEPOINT: | |
1526 | case LTTNG_KERNEL_SYSCALL: | |
3c997079 MD |
1527 | /* Enable events */ |
1528 | list_for_each_entry(enabler_ref, | |
1529 | &event->enablers_ref_head, node) { | |
1530 | if (enabler_ref->ref->enabled) { | |
1531 | enabled = 1; | |
1532 | break; | |
1533 | } | |
1534 | } | |
4ecb5ad5 MD |
1535 | break; |
1536 | default: | |
3c997079 MD |
1537 | /* Not handled with lazy sync. */ |
1538 | continue; | |
1539 | } | |
1540 | /* | |
1541 | * Enabled state is based on union of enablers, with | |
1542 | * intesection of session and channel transient enable | |
1543 | * states. | |
1544 | */ | |
1545 | enabled = enabled && session->tstate && event->chan->tstate; | |
1546 | ||
a8f2d0c7 | 1547 | WRITE_ONCE(event->enabled, enabled); |
3c997079 MD |
1548 | /* |
1549 | * Sync tracepoint registration with event enabled | |
1550 | * state. | |
1551 | */ | |
1552 | if (enabled) { | |
1553 | register_event(event); | |
1554 | } else { | |
1555 | _lttng_event_unregister(event); | |
1556 | } | |
07dfc1d0 MD |
1557 | |
1558 | /* Check if has enablers without bytecode enabled */ | |
1559 | list_for_each_entry(enabler_ref, | |
1560 | &event->enablers_ref_head, node) { | |
1561 | if (enabler_ref->ref->enabled | |
1562 | && list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1563 | has_enablers_without_bytecode = 1; | |
1564 | break; | |
1565 | } | |
1566 | } | |
1567 | event->has_enablers_without_bytecode = | |
1568 | has_enablers_without_bytecode; | |
1569 | ||
1570 | /* Enable filters */ | |
1571 | list_for_each_entry(runtime, | |
f127e61e | 1572 | &event->bytecode_runtime_head, node) |
07dfc1d0 | 1573 | lttng_filter_sync_state(runtime); |
3c997079 MD |
1574 | } |
1575 | } | |
1576 | ||
1577 | /* | |
1578 | * Apply enablers to session events, adding events to session if need | |
1579 | * be. It is required after each modification applied to an active | |
1580 | * session, and right before session "start". | |
1581 | * "lazy" sync means we only sync if required. | |
1582 | * Should be called with sessions mutex held. | |
1583 | */ | |
1584 | static | |
1585 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
1586 | { | |
1587 | /* We can skip if session is not active */ | |
1588 | if (!session->active) | |
1589 | return; | |
1590 | lttng_session_sync_enablers(session); | |
1591 | } | |
1592 | ||
1ec3f75a | 1593 | /* |
d83004aa JD |
1594 | * Serialize at most one packet worth of metadata into a metadata |
1595 | * channel. | |
92d9f5e6 MD |
1596 | * We grab the metadata cache mutex to get exclusive access to our metadata |
1597 | * buffer and to the metadata cache. Exclusive access to the metadata buffer | |
1598 | * allows us to do racy operations such as looking for remaining space left in | |
1599 | * packet and write, since mutual exclusion protects us from concurrent writes. | |
1600 | * Mutual exclusion on the metadata cache allow us to read the cache content | |
1601 | * without racing against reallocation of the cache by updates. | |
35097f36 JD |
1602 | * Returns the number of bytes written in the channel, 0 if no data |
1603 | * was written and a negative value on error. | |
1ec3f75a | 1604 | */ |
b3b8072b MD |
1605 | int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, |
1606 | struct channel *chan) | |
d83004aa JD |
1607 | { |
1608 | struct lib_ring_buffer_ctx ctx; | |
1609 | int ret = 0; | |
1610 | size_t len, reserve_len; | |
1611 | ||
f613e3e6 | 1612 | /* |
92d9f5e6 MD |
1613 | * Ensure we support mutiple get_next / put sequences followed by |
1614 | * put_next. The metadata cache lock protects reading the metadata | |
1615 | * cache. It can indeed be read concurrently by "get_next_subbuf" and | |
1616 | * "flush" operations on the buffer invoked by different processes. | |
1617 | * Moreover, since the metadata cache memory can be reallocated, we | |
1618 | * need to have exclusive access against updates even though we only | |
1619 | * read it. | |
f613e3e6 | 1620 | */ |
92d9f5e6 | 1621 | mutex_lock(&stream->metadata_cache->lock); |
f613e3e6 MD |
1622 | WARN_ON(stream->metadata_in < stream->metadata_out); |
1623 | if (stream->metadata_in != stream->metadata_out) | |
de23d59d | 1624 | goto end; |
f613e3e6 | 1625 | |
9616f0bf JD |
1626 | /* Metadata regenerated, change the version. */ |
1627 | if (stream->metadata_cache->version != stream->version) | |
1628 | stream->version = stream->metadata_cache->version; | |
1629 | ||
d83004aa | 1630 | len = stream->metadata_cache->metadata_written - |
f613e3e6 | 1631 | stream->metadata_in; |
9de2c215 | 1632 | if (!len) |
de23d59d | 1633 | goto end; |
d83004aa | 1634 | reserve_len = min_t(size_t, |
b3b8072b | 1635 | stream->transport->ops.packet_avail_size(chan), |
d83004aa | 1636 | len); |
b3b8072b | 1637 | lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len, |
d83004aa JD |
1638 | sizeof(char), -1); |
1639 | /* | |
1640 | * If reservation failed, return an error to the caller. | |
1641 | */ | |
b3b8072b | 1642 | ret = stream->transport->ops.event_reserve(&ctx, 0); |
d83004aa JD |
1643 | if (ret != 0) { |
1644 | printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); | |
1645 | goto end; | |
1646 | } | |
b3b8072b | 1647 | stream->transport->ops.event_write(&ctx, |
f613e3e6 | 1648 | stream->metadata_cache->data + stream->metadata_in, |
d83004aa | 1649 | reserve_len); |
b3b8072b | 1650 | stream->transport->ops.event_commit(&ctx); |
f613e3e6 | 1651 | stream->metadata_in += reserve_len; |
d83004aa JD |
1652 | ret = reserve_len; |
1653 | ||
1654 | end: | |
92d9f5e6 | 1655 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1656 | return ret; |
1657 | } | |
1658 | ||
1659 | /* | |
1660 | * Write the metadata to the metadata cache. | |
1661 | * Must be called with sessions_mutex held. | |
92d9f5e6 MD |
1662 | * The metadata cache lock protects us from concurrent read access from |
1663 | * thread outputting metadata content to ring buffer. | |
d83004aa | 1664 | */ |
a90917c3 | 1665 | int lttng_metadata_printf(struct lttng_session *session, |
c099397a MD |
1666 | const char *fmt, ...) |
1667 | { | |
c099397a | 1668 | char *str; |
d83004aa | 1669 | size_t len; |
c099397a | 1670 | va_list ap; |
d83004aa | 1671 | struct lttng_metadata_stream *stream; |
c099397a | 1672 | |
a8f2d0c7 | 1673 | WARN_ON_ONCE(!READ_ONCE(session->active)); |
c099397a MD |
1674 | |
1675 | va_start(ap, fmt); | |
1676 | str = kvasprintf(GFP_KERNEL, fmt, ap); | |
1677 | va_end(ap); | |
1678 | if (!str) | |
1679 | return -ENOMEM; | |
1680 | ||
1ec3f75a | 1681 | len = strlen(str); |
92d9f5e6 | 1682 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1683 | if (session->metadata_cache->metadata_written + len > |
1684 | session->metadata_cache->cache_alloc) { | |
1685 | char *tmp_cache_realloc; | |
1686 | unsigned int tmp_cache_alloc_size; | |
1687 | ||
1688 | tmp_cache_alloc_size = max_t(unsigned int, | |
1689 | session->metadata_cache->cache_alloc + len, | |
1690 | session->metadata_cache->cache_alloc << 1); | |
0ca42eb7 | 1691 | tmp_cache_realloc = vzalloc(tmp_cache_alloc_size); |
d83004aa JD |
1692 | if (!tmp_cache_realloc) |
1693 | goto err; | |
a606b6e8 ML |
1694 | if (session->metadata_cache->data) { |
1695 | memcpy(tmp_cache_realloc, | |
1696 | session->metadata_cache->data, | |
1697 | session->metadata_cache->cache_alloc); | |
1698 | vfree(session->metadata_cache->data); | |
1699 | } | |
1700 | ||
d83004aa JD |
1701 | session->metadata_cache->cache_alloc = tmp_cache_alloc_size; |
1702 | session->metadata_cache->data = tmp_cache_realloc; | |
c099397a | 1703 | } |
d83004aa JD |
1704 | memcpy(session->metadata_cache->data + |
1705 | session->metadata_cache->metadata_written, | |
1706 | str, len); | |
1707 | session->metadata_cache->metadata_written += len; | |
92d9f5e6 | 1708 | mutex_unlock(&session->metadata_cache->lock); |
c099397a | 1709 | kfree(str); |
d83004aa JD |
1710 | |
1711 | list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) | |
1712 | wake_up_interruptible(&stream->read_wait); | |
1713 | ||
1714 | return 0; | |
1715 | ||
1716 | err: | |
92d9f5e6 | 1717 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1718 | kfree(str); |
1719 | return -ENOMEM; | |
c099397a MD |
1720 | } |
1721 | ||
f513b2bf MD |
1722 | static |
1723 | int print_tabs(struct lttng_session *session, size_t nesting) | |
1724 | { | |
1725 | size_t i; | |
1726 | ||
1727 | for (i = 0; i < nesting; i++) { | |
1728 | int ret; | |
1729 | ||
1730 | ret = lttng_metadata_printf(session, " "); | |
1731 | if (ret) { | |
1732 | return ret; | |
1733 | } | |
1734 | } | |
1735 | return 0; | |
1736 | } | |
1737 | ||
ceabb767 MD |
1738 | static |
1739 | int lttng_field_name_statedump(struct lttng_session *session, | |
1740 | const struct lttng_event_field *field, | |
1741 | size_t nesting) | |
1742 | { | |
1743 | return lttng_metadata_printf(session, " _%s;\n", field->name); | |
1744 | } | |
1745 | ||
1746 | static | |
1747 | int _lttng_integer_type_statedump(struct lttng_session *session, | |
1748 | const struct lttng_type *type, | |
1749 | size_t nesting) | |
1750 | { | |
1751 | int ret; | |
1752 | ||
1753 | WARN_ON_ONCE(type->atype != atype_integer); | |
1754 | ret = print_tabs(session, nesting); | |
1755 | if (ret) | |
1756 | return ret; | |
1757 | ret = lttng_metadata_printf(session, | |
1758 | "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }", | |
1759 | type->u.integer.size, | |
1760 | type->u.integer.alignment, | |
1761 | type->u.integer.signedness, | |
1762 | (type->u.integer.encoding == lttng_encode_none) | |
1763 | ? "none" | |
1764 | : (type->u.integer.encoding == lttng_encode_UTF8) | |
1765 | ? "UTF8" | |
1766 | : "ASCII", | |
1767 | type->u.integer.base, | |
1768 | #if __BYTE_ORDER == __BIG_ENDIAN | |
1769 | type->u.integer.reverse_byte_order ? " byte_order = le;" : "" | |
1770 | #else | |
1771 | type->u.integer.reverse_byte_order ? " byte_order = be;" : "" | |
1772 | #endif | |
1773 | ); | |
1774 | return ret; | |
1775 | } | |
1776 | ||
f513b2bf MD |
1777 | /* |
1778 | * Must be called with sessions_mutex held. | |
1779 | */ | |
1780 | static | |
1781 | int _lttng_struct_type_statedump(struct lttng_session *session, | |
1782 | const struct lttng_type *type, | |
1783 | size_t nesting) | |
1784 | { | |
1785 | int ret; | |
1786 | uint32_t i, nr_fields; | |
ceabb767 MD |
1787 | unsigned int alignment; |
1788 | ||
1789 | WARN_ON_ONCE(type->atype != atype_struct_nestable); | |
f513b2bf MD |
1790 | |
1791 | ret = print_tabs(session, nesting); | |
1792 | if (ret) | |
1793 | return ret; | |
1794 | ret = lttng_metadata_printf(session, | |
1795 | "struct {\n"); | |
1796 | if (ret) | |
1797 | return ret; | |
ceabb767 | 1798 | nr_fields = type->u.struct_nestable.nr_fields; |
f513b2bf MD |
1799 | for (i = 0; i < nr_fields; i++) { |
1800 | const struct lttng_event_field *iter_field; | |
1801 | ||
ceabb767 | 1802 | iter_field = &type->u.struct_nestable.fields[i]; |
f513b2bf MD |
1803 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
1804 | if (ret) | |
1805 | return ret; | |
1806 | } | |
1807 | ret = print_tabs(session, nesting); | |
1808 | if (ret) | |
1809 | return ret; | |
ceabb767 MD |
1810 | alignment = type->u.struct_nestable.alignment; |
1811 | if (alignment) { | |
1812 | ret = lttng_metadata_printf(session, | |
1813 | "} align(%u)", | |
1814 | alignment); | |
1815 | } else { | |
1816 | ret = lttng_metadata_printf(session, | |
1817 | "}"); | |
1818 | } | |
f513b2bf MD |
1819 | return ret; |
1820 | } | |
1821 | ||
1822 | /* | |
1823 | * Must be called with sessions_mutex held. | |
1824 | */ | |
1825 | static | |
ceabb767 | 1826 | int _lttng_struct_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1827 | const struct lttng_event_field *field, |
1828 | size_t nesting) | |
1829 | { | |
1830 | int ret; | |
1831 | ||
1832 | ret = _lttng_struct_type_statedump(session, | |
1833 | &field->type, nesting); | |
1834 | if (ret) | |
1835 | return ret; | |
ceabb767 | 1836 | return lttng_field_name_statedump(session, field, nesting); |
f513b2bf MD |
1837 | } |
1838 | ||
65c85aa6 MD |
1839 | /* |
1840 | * Must be called with sessions_mutex held. | |
1841 | */ | |
1842 | static | |
1843 | int _lttng_variant_type_statedump(struct lttng_session *session, | |
1844 | const struct lttng_type *type, | |
1845 | size_t nesting) | |
1846 | { | |
1847 | int ret; | |
1848 | uint32_t i, nr_choices; | |
1849 | ||
ceabb767 MD |
1850 | WARN_ON_ONCE(type->atype != atype_variant_nestable); |
1851 | /* | |
1852 | * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way. | |
1853 | */ | |
1854 | if (type->u.variant_nestable.alignment != 0) | |
1855 | return -EINVAL; | |
65c85aa6 MD |
1856 | ret = print_tabs(session, nesting); |
1857 | if (ret) | |
1858 | return ret; | |
1859 | ret = lttng_metadata_printf(session, | |
1860 | "variant <_%s> {\n", | |
ceabb767 | 1861 | type->u.variant_nestable.tag_name); |
65c85aa6 MD |
1862 | if (ret) |
1863 | return ret; | |
ceabb767 | 1864 | nr_choices = type->u.variant_nestable.nr_choices; |
65c85aa6 MD |
1865 | for (i = 0; i < nr_choices; i++) { |
1866 | const struct lttng_event_field *iter_field; | |
1867 | ||
ceabb767 | 1868 | iter_field = &type->u.variant_nestable.choices[i]; |
65c85aa6 MD |
1869 | ret = _lttng_field_statedump(session, iter_field, nesting + 1); |
1870 | if (ret) | |
1871 | return ret; | |
1872 | } | |
1873 | ret = print_tabs(session, nesting); | |
1874 | if (ret) | |
1875 | return ret; | |
1876 | ret = lttng_metadata_printf(session, | |
1877 | "}"); | |
1878 | return ret; | |
1879 | } | |
1880 | ||
1881 | /* | |
1882 | * Must be called with sessions_mutex held. | |
1883 | */ | |
1884 | static | |
ceabb767 | 1885 | int _lttng_variant_field_statedump(struct lttng_session *session, |
65c85aa6 MD |
1886 | const struct lttng_event_field *field, |
1887 | size_t nesting) | |
1888 | { | |
1889 | int ret; | |
1890 | ||
1891 | ret = _lttng_variant_type_statedump(session, | |
1892 | &field->type, nesting); | |
1893 | if (ret) | |
1894 | return ret; | |
ceabb767 | 1895 | return lttng_field_name_statedump(session, field, nesting); |
65c85aa6 MD |
1896 | } |
1897 | ||
f513b2bf MD |
1898 | /* |
1899 | * Must be called with sessions_mutex held. | |
1900 | */ | |
1901 | static | |
ceabb767 | 1902 | int _lttng_array_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1903 | const struct lttng_event_field *field, |
1904 | size_t nesting) | |
1905 | { | |
1906 | int ret; | |
1907 | const struct lttng_type *elem_type; | |
1908 | ||
ceabb767 MD |
1909 | WARN_ON_ONCE(field->type.atype != atype_array_nestable); |
1910 | ||
1911 | if (field->type.u.array_nestable.alignment) { | |
1912 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
1913 | if (ret) |
1914 | return ret; | |
ceabb767 MD |
1915 | ret = lttng_metadata_printf(session, |
1916 | "struct { } align(%u) _%s_padding;\n", | |
1917 | field->type.u.array_nestable.alignment * CHAR_BIT, | |
1918 | field->name); | |
1919 | if (ret) | |
1920 | return ret; | |
1921 | } | |
1922 | /* | |
1923 | * Nested compound types: Only array of structures and variants are | |
1924 | * currently supported. | |
1925 | */ | |
1926 | elem_type = field->type.u.array_nestable.elem_type; | |
1927 | switch (elem_type->atype) { | |
1928 | case atype_integer: | |
1929 | case atype_struct_nestable: | |
1930 | case atype_variant_nestable: | |
1931 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
1932 | if (ret) |
1933 | return ret; | |
1934 | break; | |
ceabb767 | 1935 | |
f513b2bf MD |
1936 | default: |
1937 | return -EINVAL; | |
1938 | } | |
1939 | ret = lttng_metadata_printf(session, | |
1940 | " _%s[%u];\n", | |
1941 | field->name, | |
ceabb767 | 1942 | field->type.u.array_nestable.length); |
f513b2bf MD |
1943 | return ret; |
1944 | } | |
1945 | ||
1946 | /* | |
1947 | * Must be called with sessions_mutex held. | |
1948 | */ | |
1949 | static | |
ceabb767 | 1950 | int _lttng_sequence_field_statedump(struct lttng_session *session, |
f513b2bf MD |
1951 | const struct lttng_event_field *field, |
1952 | size_t nesting) | |
1953 | { | |
1954 | int ret; | |
1955 | const char *length_name; | |
1956 | const struct lttng_type *elem_type; | |
1957 | ||
ceabb767 | 1958 | WARN_ON_ONCE(field->type.atype != atype_sequence_nestable); |
f513b2bf | 1959 | |
ceabb767 MD |
1960 | length_name = field->type.u.sequence_nestable.length_name; |
1961 | ||
1962 | if (field->type.u.sequence_nestable.alignment) { | |
1963 | ret = print_tabs(session, nesting); | |
f513b2bf MD |
1964 | if (ret) |
1965 | return ret; | |
ceabb767 MD |
1966 | ret = lttng_metadata_printf(session, |
1967 | "struct { } align(%u) _%s_padding;\n", | |
1968 | field->type.u.sequence_nestable.alignment * CHAR_BIT, | |
1969 | field->name); | |
1970 | if (ret) | |
1971 | return ret; | |
1972 | } | |
1973 | ||
1974 | /* | |
1975 | * Nested compound types: Only array of structures and variants are | |
1976 | * currently supported. | |
1977 | */ | |
1978 | elem_type = field->type.u.sequence_nestable.elem_type; | |
1979 | switch (elem_type->atype) { | |
1980 | case atype_integer: | |
1981 | case atype_struct_nestable: | |
1982 | case atype_variant_nestable: | |
1983 | ret = _lttng_type_statedump(session, elem_type, nesting); | |
65c85aa6 MD |
1984 | if (ret) |
1985 | return ret; | |
1986 | break; | |
ceabb767 | 1987 | |
f513b2bf MD |
1988 | default: |
1989 | return -EINVAL; | |
1990 | } | |
1991 | ret = lttng_metadata_printf(session, | |
1992 | " _%s[ _%s ];\n", | |
1993 | field->name, | |
ceabb767 | 1994 | field->type.u.sequence_nestable.length_name); |
f513b2bf MD |
1995 | return ret; |
1996 | } | |
1997 | ||
141ddf28 MD |
1998 | /* |
1999 | * Must be called with sessions_mutex held. | |
2000 | */ | |
2001 | static | |
ceabb767 MD |
2002 | int _lttng_enum_type_statedump(struct lttng_session *session, |
2003 | const struct lttng_type *type, | |
141ddf28 MD |
2004 | size_t nesting) |
2005 | { | |
2006 | const struct lttng_enum_desc *enum_desc; | |
ceabb767 | 2007 | const struct lttng_type *container_type; |
141ddf28 MD |
2008 | int ret; |
2009 | unsigned int i, nr_entries; | |
2010 | ||
ceabb767 MD |
2011 | container_type = type->u.enum_nestable.container_type; |
2012 | if (container_type->atype != atype_integer) { | |
2013 | ret = -EINVAL; | |
2014 | goto end; | |
2015 | } | |
2016 | enum_desc = type->u.enum_nestable.desc; | |
141ddf28 MD |
2017 | nr_entries = enum_desc->nr_entries; |
2018 | ||
2019 | ret = print_tabs(session, nesting); | |
2020 | if (ret) | |
2021 | goto end; | |
ceabb767 MD |
2022 | ret = lttng_metadata_printf(session, "enum : "); |
2023 | if (ret) | |
2024 | goto end; | |
2025 | ret = _lttng_integer_type_statedump(session, container_type, 0); | |
141ddf28 | 2026 | if (ret) |
ceabb767 MD |
2027 | goto end; |
2028 | ret = lttng_metadata_printf(session, " {\n"); | |
2029 | if (ret) | |
2030 | goto end; | |
141ddf28 MD |
2031 | /* Dump all entries */ |
2032 | for (i = 0; i < nr_entries; i++) { | |
2033 | const struct lttng_enum_entry *entry = &enum_desc->entries[i]; | |
2034 | int j, len; | |
2035 | ||
2036 | ret = print_tabs(session, nesting + 1); | |
2037 | if (ret) | |
2038 | goto end; | |
2039 | ret = lttng_metadata_printf(session, | |
2040 | "\""); | |
2041 | if (ret) | |
2042 | goto end; | |
2043 | len = strlen(entry->string); | |
2044 | /* Escape the character '"' */ | |
2045 | for (j = 0; j < len; j++) { | |
2046 | char c = entry->string[j]; | |
2047 | ||
2048 | switch (c) { | |
2049 | case '"': | |
2050 | ret = lttng_metadata_printf(session, | |
2051 | "\\\""); | |
2052 | break; | |
2053 | case '\\': | |
2054 | ret = lttng_metadata_printf(session, | |
2055 | "\\\\"); | |
2056 | break; | |
2057 | default: | |
2058 | ret = lttng_metadata_printf(session, | |
2059 | "%c", c); | |
2060 | break; | |
2061 | } | |
2062 | if (ret) | |
2063 | goto end; | |
2064 | } | |
08ad1061 PP |
2065 | ret = lttng_metadata_printf(session, "\""); |
2066 | if (ret) | |
2067 | goto end; | |
2068 | ||
2069 | if (entry->options.is_auto) { | |
2070 | ret = lttng_metadata_printf(session, ",\n"); | |
2071 | if (ret) | |
2072 | goto end; | |
141ddf28 | 2073 | } else { |
7c559490 MD |
2074 | ret = lttng_metadata_printf(session, |
2075 | " = "); | |
2076 | if (ret) | |
2077 | goto end; | |
2078 | if (entry->start.signedness) | |
141ddf28 | 2079 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2080 | "%lld", (long long) entry->start.value); |
2081 | else | |
2082 | ret = lttng_metadata_printf(session, | |
2083 | "%llu", entry->start.value); | |
2084 | if (ret) | |
2085 | goto end; | |
2086 | if (entry->start.signedness == entry->end.signedness && | |
2087 | entry->start.value | |
2088 | == entry->end.value) { | |
141ddf28 | 2089 | ret = lttng_metadata_printf(session, |
7c559490 MD |
2090 | ",\n"); |
2091 | } else { | |
2092 | if (entry->end.signedness) { | |
2093 | ret = lttng_metadata_printf(session, | |
2094 | " ... %lld,\n", | |
2095 | (long long) entry->end.value); | |
2096 | } else { | |
2097 | ret = lttng_metadata_printf(session, | |
2098 | " ... %llu,\n", | |
2099 | entry->end.value); | |
2100 | } | |
141ddf28 | 2101 | } |
7c559490 MD |
2102 | if (ret) |
2103 | goto end; | |
141ddf28 | 2104 | } |
141ddf28 MD |
2105 | } |
2106 | ret = print_tabs(session, nesting); | |
2107 | if (ret) | |
2108 | goto end; | |
ceabb767 | 2109 | ret = lttng_metadata_printf(session, "}"); |
141ddf28 MD |
2110 | end: |
2111 | return ret; | |
2112 | } | |
2113 | ||
d83004aa JD |
2114 | /* |
2115 | * Must be called with sessions_mutex held. | |
2116 | */ | |
c099397a | 2117 | static |
ceabb767 MD |
2118 | int _lttng_enum_field_statedump(struct lttng_session *session, |
2119 | const struct lttng_event_field *field, | |
2120 | size_t nesting) | |
2121 | { | |
2122 | int ret; | |
2123 | ||
2124 | ret = _lttng_enum_type_statedump(session, &field->type, nesting); | |
2125 | if (ret) | |
2126 | return ret; | |
2127 | return lttng_field_name_statedump(session, field, nesting); | |
2128 | } | |
2129 | ||
2130 | static | |
2131 | int _lttng_integer_field_statedump(struct lttng_session *session, | |
2132 | const struct lttng_event_field *field, | |
2133 | size_t nesting) | |
2134 | { | |
2135 | int ret; | |
2136 | ||
2137 | ret = _lttng_integer_type_statedump(session, &field->type, nesting); | |
2138 | if (ret) | |
2139 | return ret; | |
2140 | return lttng_field_name_statedump(session, field, nesting); | |
2141 | } | |
2142 | ||
2143 | static | |
2144 | int _lttng_string_type_statedump(struct lttng_session *session, | |
2145 | const struct lttng_type *type, | |
2146 | size_t nesting) | |
2147 | { | |
2148 | int ret; | |
2149 | ||
2150 | WARN_ON_ONCE(type->atype != atype_string); | |
2151 | /* Default encoding is UTF8 */ | |
2152 | ret = print_tabs(session, nesting); | |
2153 | if (ret) | |
2154 | return ret; | |
2155 | ret = lttng_metadata_printf(session, | |
2156 | "string%s", | |
2157 | type->u.string.encoding == lttng_encode_ASCII ? | |
2158 | " { encoding = ASCII; }" : ""); | |
2159 | return ret; | |
2160 | } | |
2161 | ||
2162 | static | |
2163 | int _lttng_string_field_statedump(struct lttng_session *session, | |
f513b2bf MD |
2164 | const struct lttng_event_field *field, |
2165 | size_t nesting) | |
ceabb767 MD |
2166 | { |
2167 | int ret; | |
2168 | ||
2169 | WARN_ON_ONCE(field->type.atype != atype_string); | |
2170 | ret = _lttng_string_type_statedump(session, &field->type, nesting); | |
2171 | if (ret) | |
2172 | return ret; | |
2173 | return lttng_field_name_statedump(session, field, nesting); | |
2174 | } | |
2175 | ||
2176 | /* | |
2177 | * Must be called with sessions_mutex held. | |
2178 | */ | |
2179 | static | |
2180 | int _lttng_type_statedump(struct lttng_session *session, | |
2181 | const struct lttng_type *type, | |
2182 | size_t nesting) | |
c099397a | 2183 | { |
c099397a | 2184 | int ret = 0; |
c099397a | 2185 | |
ceabb767 | 2186 | switch (type->atype) { |
8070f5c0 | 2187 | case atype_integer: |
ceabb767 | 2188 | ret = _lttng_integer_type_statedump(session, type, nesting); |
8070f5c0 | 2189 | break; |
ceabb767 MD |
2190 | case atype_enum_nestable: |
2191 | ret = _lttng_enum_type_statedump(session, type, nesting); | |
8070f5c0 | 2192 | break; |
ceabb767 MD |
2193 | case atype_string: |
2194 | ret = _lttng_string_type_statedump(session, type, nesting); | |
2195 | break; | |
2196 | case atype_struct_nestable: | |
2197 | ret = _lttng_struct_type_statedump(session, type, nesting); | |
8070f5c0 | 2198 | break; |
ceabb767 MD |
2199 | case atype_variant_nestable: |
2200 | ret = _lttng_variant_type_statedump(session, type, nesting); | |
2201 | break; | |
2202 | ||
2203 | /* Nested arrays and sequences are not supported yet. */ | |
2204 | case atype_array_nestable: | |
2205 | case atype_sequence_nestable: | |
2206 | default: | |
2207 | WARN_ON_ONCE(1); | |
2208 | return -EINVAL; | |
8070f5c0 | 2209 | } |
ceabb767 MD |
2210 | return ret; |
2211 | } | |
8070f5c0 | 2212 | |
ceabb767 MD |
2213 | /* |
2214 | * Must be called with sessions_mutex held. | |
2215 | */ | |
2216 | static | |
2217 | int _lttng_field_statedump(struct lttng_session *session, | |
2218 | const struct lttng_event_field *field, | |
2219 | size_t nesting) | |
2220 | { | |
2221 | int ret = 0; | |
27d2368e | 2222 | |
ceabb767 MD |
2223 | switch (field->type.atype) { |
2224 | case atype_integer: | |
2225 | ret = _lttng_integer_field_statedump(session, field, nesting); | |
2226 | break; | |
2227 | case atype_enum_nestable: | |
2228 | ret = _lttng_enum_field_statedump(session, field, nesting); | |
8070f5c0 | 2229 | break; |
8070f5c0 | 2230 | case atype_string: |
ceabb767 | 2231 | ret = _lttng_string_field_statedump(session, field, nesting); |
8070f5c0 | 2232 | break; |
ceabb767 MD |
2233 | case atype_struct_nestable: |
2234 | ret = _lttng_struct_field_statedump(session, field, nesting); | |
f513b2bf | 2235 | break; |
ceabb767 MD |
2236 | case atype_array_nestable: |
2237 | ret = _lttng_array_field_statedump(session, field, nesting); | |
f513b2bf | 2238 | break; |
ceabb767 MD |
2239 | case atype_sequence_nestable: |
2240 | ret = _lttng_sequence_field_statedump(session, field, nesting); | |
f513b2bf | 2241 | break; |
ceabb767 MD |
2242 | case atype_variant_nestable: |
2243 | ret = _lttng_variant_field_statedump(session, field, nesting); | |
65c85aa6 | 2244 | break; |
f513b2bf | 2245 | |
8070f5c0 MD |
2246 | default: |
2247 | WARN_ON_ONCE(1); | |
2248 | return -EINVAL; | |
2249 | } | |
2250 | return ret; | |
2251 | } | |
2252 | ||
2253 | static | |
a90917c3 | 2254 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8070f5c0 MD |
2255 | struct lttng_ctx *ctx) |
2256 | { | |
2257 | int ret = 0; | |
2258 | int i; | |
2259 | ||
2260 | if (!ctx) | |
2261 | return 0; | |
2262 | for (i = 0; i < ctx->nr_fields; i++) { | |
2263 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
2264 | ||
f513b2bf | 2265 | ret = _lttng_field_statedump(session, &field->event_field, 2); |
8070f5c0 MD |
2266 | if (ret) |
2267 | return ret; | |
2268 | } | |
2269 | return ret; | |
2270 | } | |
2271 | ||
2272 | static | |
a90917c3 MD |
2273 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
2274 | struct lttng_event *event) | |
8070f5c0 MD |
2275 | { |
2276 | const struct lttng_event_desc *desc = event->desc; | |
2277 | int ret = 0; | |
2278 | int i; | |
2279 | ||
2280 | for (i = 0; i < desc->nr_fields; i++) { | |
2281 | const struct lttng_event_field *field = &desc->fields[i]; | |
2282 | ||
f513b2bf | 2283 | ret = _lttng_field_statedump(session, field, 2); |
8070f5c0 MD |
2284 | if (ret) |
2285 | return ret; | |
c099397a MD |
2286 | } |
2287 | return ret; | |
2288 | } | |
2289 | ||
d83004aa JD |
2290 | /* |
2291 | * Must be called with sessions_mutex held. | |
2292 | */ | |
c099397a | 2293 | static |
a90917c3 MD |
2294 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
2295 | struct lttng_channel *chan, | |
2296 | struct lttng_event *event) | |
c099397a MD |
2297 | { |
2298 | int ret = 0; | |
2299 | ||
a8f2d0c7 | 2300 | if (event->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2301 | return 0; |
d83004aa | 2302 | if (chan->channel_type == METADATA_CHANNEL) |
c099397a MD |
2303 | return 0; |
2304 | ||
2305 | ret = lttng_metadata_printf(session, | |
2306 | "event {\n" | |
ae734547 | 2307 | " name = \"%s\";\n" |
c099397a | 2308 | " id = %u;\n" |
b9074a1b | 2309 | " stream_id = %u;\n", |
c099397a MD |
2310 | event->desc->name, |
2311 | event->id, | |
2312 | event->chan->id); | |
2313 | if (ret) | |
2314 | goto end; | |
2315 | ||
b9074a1b MD |
2316 | if (event->ctx) { |
2317 | ret = lttng_metadata_printf(session, | |
2318 | " context := struct {\n"); | |
2319 | if (ret) | |
2320 | goto end; | |
2321 | } | |
a90917c3 | 2322 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8070f5c0 MD |
2323 | if (ret) |
2324 | goto end; | |
b9074a1b MD |
2325 | if (event->ctx) { |
2326 | ret = lttng_metadata_printf(session, | |
2327 | " };\n"); | |
2328 | if (ret) | |
2329 | goto end; | |
2330 | } | |
8070f5c0 MD |
2331 | |
2332 | ret = lttng_metadata_printf(session, | |
8070f5c0 MD |
2333 | " fields := struct {\n" |
2334 | ); | |
2335 | if (ret) | |
2336 | goto end; | |
2337 | ||
a90917c3 | 2338 | ret = _lttng_fields_metadata_statedump(session, event); |
c099397a MD |
2339 | if (ret) |
2340 | goto end; | |
2341 | ||
2342 | /* | |
2343 | * LTTng space reservation can only reserve multiples of the | |
2344 | * byte size. | |
2345 | */ | |
2346 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2347 | " };\n" |
2348 | "};\n\n"); | |
c099397a MD |
2349 | if (ret) |
2350 | goto end; | |
2351 | ||
c099397a MD |
2352 | event->metadata_dumped = 1; |
2353 | end: | |
2354 | return ret; | |
2355 | ||
2356 | } | |
2357 | ||
d83004aa JD |
2358 | /* |
2359 | * Must be called with sessions_mutex held. | |
2360 | */ | |
c099397a | 2361 | static |
a90917c3 MD |
2362 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
2363 | struct lttng_channel *chan) | |
c099397a MD |
2364 | { |
2365 | int ret = 0; | |
2366 | ||
a8f2d0c7 | 2367 | if (chan->metadata_dumped || !READ_ONCE(session->active)) |
c099397a | 2368 | return 0; |
d83004aa JD |
2369 | |
2370 | if (chan->channel_type == METADATA_CHANNEL) | |
c099397a MD |
2371 | return 0; |
2372 | ||
2373 | WARN_ON_ONCE(!chan->header_type); | |
2374 | ret = lttng_metadata_printf(session, | |
2375 | "stream {\n" | |
2376 | " id = %u;\n" | |
9115fbdc | 2377 | " event.header := %s;\n" |
b9074a1b | 2378 | " packet.context := struct packet_context;\n", |
c099397a MD |
2379 | chan->id, |
2380 | chan->header_type == 1 ? "struct event_header_compact" : | |
2381 | "struct event_header_large"); | |
2382 | if (ret) | |
2383 | goto end; | |
2384 | ||
b9074a1b MD |
2385 | if (chan->ctx) { |
2386 | ret = lttng_metadata_printf(session, | |
2387 | " event.context := struct {\n"); | |
2388 | if (ret) | |
2389 | goto end; | |
2390 | } | |
a90917c3 | 2391 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8070f5c0 MD |
2392 | if (ret) |
2393 | goto end; | |
b9074a1b MD |
2394 | if (chan->ctx) { |
2395 | ret = lttng_metadata_printf(session, | |
2396 | " };\n"); | |
2397 | if (ret) | |
2398 | goto end; | |
2399 | } | |
8070f5c0 MD |
2400 | |
2401 | ret = lttng_metadata_printf(session, | |
b9074a1b | 2402 | "};\n\n"); |
8070f5c0 | 2403 | |
c099397a MD |
2404 | chan->metadata_dumped = 1; |
2405 | end: | |
2406 | return ret; | |
2407 | } | |
2408 | ||
d83004aa JD |
2409 | /* |
2410 | * Must be called with sessions_mutex held. | |
2411 | */ | |
9115fbdc | 2412 | static |
a90917c3 | 2413 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
9115fbdc MD |
2414 | { |
2415 | return lttng_metadata_printf(session, | |
2416 | "struct packet_context {\n" | |
a3ccff4f MD |
2417 | " uint64_clock_monotonic_t timestamp_begin;\n" |
2418 | " uint64_clock_monotonic_t timestamp_end;\n" | |
576ca06a MD |
2419 | " uint64_t content_size;\n" |
2420 | " uint64_t packet_size;\n" | |
5b3cf4f9 | 2421 | " uint64_t packet_seq_num;\n" |
a9afe705 | 2422 | " unsigned long events_discarded;\n" |
9115fbdc | 2423 | " uint32_t cpu_id;\n" |
c6dfdf6f | 2424 | "};\n\n" |
9115fbdc MD |
2425 | ); |
2426 | } | |
2427 | ||
2428 | /* | |
2429 | * Compact header: | |
2430 | * id: range: 0 - 30. | |
2431 | * id 31 is reserved to indicate an extended header. | |
2432 | * | |
2433 | * Large header: | |
2434 | * id: range: 0 - 65534. | |
2435 | * id 65535 is reserved to indicate an extended header. | |
d83004aa JD |
2436 | * |
2437 | * Must be called with sessions_mutex held. | |
9115fbdc MD |
2438 | */ |
2439 | static | |
a90917c3 | 2440 | int _lttng_event_header_declare(struct lttng_session *session) |
9115fbdc MD |
2441 | { |
2442 | return lttng_metadata_printf(session, | |
2443 | "struct event_header_compact {\n" | |
2444 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
2445 | " variant <id> {\n" | |
2446 | " struct {\n" | |
a3ccff4f | 2447 | " uint27_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2448 | " } compact;\n" |
2449 | " struct {\n" | |
2450 | " uint32_t id;\n" | |
a3ccff4f | 2451 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2452 | " } extended;\n" |
2453 | " } v;\n" | |
2454 | "} align(%u);\n" | |
2455 | "\n" | |
2456 | "struct event_header_large {\n" | |
2457 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
2458 | " variant <id> {\n" | |
2459 | " struct {\n" | |
a3ccff4f | 2460 | " uint32_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2461 | " } compact;\n" |
2462 | " struct {\n" | |
2463 | " uint32_t id;\n" | |
a3ccff4f | 2464 | " uint64_clock_monotonic_t timestamp;\n" |
9115fbdc MD |
2465 | " } extended;\n" |
2466 | " } v;\n" | |
2467 | "} align(%u);\n\n", | |
a90917c3 MD |
2468 | lttng_alignof(uint32_t) * CHAR_BIT, |
2469 | lttng_alignof(uint16_t) * CHAR_BIT | |
9115fbdc MD |
2470 | ); |
2471 | } | |
2472 | ||
a3ccff4f MD |
2473 | /* |
2474 | * Approximation of NTP time of day to clock monotonic correlation, | |
2475 | * taken at start of trace. | |
2476 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
2477 | * in future versions. | |
5283350b MD |
2478 | * This function may return a negative offset. It may happen if the |
2479 | * system sets the REALTIME clock to 0 after boot. | |
3636085f MJ |
2480 | * |
2481 | * Use 64bit timespec on kernels that have it, this makes 32bit arch | |
2482 | * y2038 compliant. | |
a3ccff4f MD |
2483 | */ |
2484 | static | |
8967b2a3 | 2485 | int64_t measure_clock_offset(void) |
a3ccff4f | 2486 | { |
dcb93448 | 2487 | uint64_t monotonic_avg, monotonic[2], realtime; |
2754583e | 2488 | uint64_t tcf = trace_clock_freq(); |
dcb93448 | 2489 | int64_t offset; |
a3ccff4f | 2490 | unsigned long flags; |
3636085f | 2491 | struct timespec64 rts = { 0, 0 }; |
a3ccff4f MD |
2492 | |
2493 | /* Disable interrupts to increase correlation precision. */ | |
2494 | local_irq_save(flags); | |
2495 | monotonic[0] = trace_clock_read64(); | |
3636085f | 2496 | ktime_get_real_ts64(&rts); |
a3ccff4f MD |
2497 | monotonic[1] = trace_clock_read64(); |
2498 | local_irq_restore(flags); | |
2499 | ||
dcb93448 | 2500 | monotonic_avg = (monotonic[0] + monotonic[1]) >> 1; |
2754583e MD |
2501 | realtime = (uint64_t) rts.tv_sec * tcf; |
2502 | if (tcf == NSEC_PER_SEC) { | |
2503 | realtime += rts.tv_nsec; | |
2504 | } else { | |
2505 | uint64_t n = rts.tv_nsec * tcf; | |
2506 | ||
2507 | do_div(n, NSEC_PER_SEC); | |
2508 | realtime += n; | |
2509 | } | |
dcb93448 | 2510 | offset = (int64_t) realtime - monotonic_avg; |
a3ccff4f MD |
2511 | return offset; |
2512 | } | |
2513 | ||
3eb95be4 JR |
2514 | static |
2515 | int print_escaped_ctf_string(struct lttng_session *session, const char *string) | |
2516 | { | |
0f3eaad4 | 2517 | int ret = 0; |
3eb95be4 JR |
2518 | size_t i; |
2519 | char cur; | |
2520 | ||
2521 | i = 0; | |
2522 | cur = string[i]; | |
2523 | while (cur != '\0') { | |
2524 | switch (cur) { | |
2525 | case '\n': | |
2526 | ret = lttng_metadata_printf(session, "%s", "\\n"); | |
2527 | break; | |
2528 | case '\\': | |
2529 | case '"': | |
2530 | ret = lttng_metadata_printf(session, "%c", '\\'); | |
2531 | if (ret) | |
2532 | goto error; | |
2533 | /* We still print the current char */ | |
2534 | /* Fallthrough */ | |
2535 | default: | |
2536 | ret = lttng_metadata_printf(session, "%c", cur); | |
2537 | break; | |
2538 | } | |
2539 | ||
2540 | if (ret) | |
2541 | goto error; | |
2542 | ||
2543 | cur = string[++i]; | |
2544 | } | |
2545 | error: | |
2546 | return ret; | |
2547 | } | |
2548 | ||
2549 | static | |
1c88f269 JR |
2550 | int print_metadata_escaped_field(struct lttng_session *session, const char *field, |
2551 | const char *field_value) | |
3eb95be4 JR |
2552 | { |
2553 | int ret; | |
2554 | ||
1c88f269 | 2555 | ret = lttng_metadata_printf(session, " %s = \"", field); |
3eb95be4 JR |
2556 | if (ret) |
2557 | goto error; | |
2558 | ||
1c88f269 | 2559 | ret = print_escaped_ctf_string(session, field_value); |
3eb95be4 JR |
2560 | if (ret) |
2561 | goto error; | |
2562 | ||
2563 | ret = lttng_metadata_printf(session, "\";\n"); | |
2564 | ||
2565 | error: | |
2566 | return ret; | |
2567 | } | |
2568 | ||
c099397a MD |
2569 | /* |
2570 | * Output metadata into this session's metadata buffers. | |
d83004aa | 2571 | * Must be called with sessions_mutex held. |
c099397a MD |
2572 | */ |
2573 | static | |
a90917c3 | 2574 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
c099397a | 2575 | { |
30bdb6e4 | 2576 | unsigned char *uuid_c = session->uuid.b; |
84bbd9ea | 2577 | unsigned char uuid_s[LTTNG_MODULES_UUID_STR_LEN], clock_uuid_s[LTTNG_MODULES_UUID_STR_LEN]; |
c88f762e | 2578 | const char *product_uuid; |
a90917c3 MD |
2579 | struct lttng_channel *chan; |
2580 | struct lttng_event *event; | |
c099397a MD |
2581 | int ret = 0; |
2582 | ||
a8f2d0c7 | 2583 | if (!READ_ONCE(session->active)) |
c099397a MD |
2584 | return 0; |
2585 | if (session->metadata_dumped) | |
2586 | goto skip_session; | |
c099397a | 2587 | |
d793d5e1 | 2588 | snprintf(uuid_s, sizeof(uuid_s), |
30bdb6e4 MD |
2589 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
2590 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
2591 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
2592 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
2593 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
d793d5e1 MD |
2594 | |
2595 | ret = lttng_metadata_printf(session, | |
9115fbdc MD |
2596 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" |
2597 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
2598 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
2599 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
a9afe705 | 2600 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
9115fbdc MD |
2601 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
2602 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
d793d5e1 MD |
2603 | "\n" |
2604 | "trace {\n" | |
2605 | " major = %u;\n" | |
2606 | " minor = %u;\n" | |
30bdb6e4 | 2607 | " uuid = \"%s\";\n" |
d793d5e1 MD |
2608 | " byte_order = %s;\n" |
2609 | " packet.header := struct {\n" | |
2610 | " uint32_t magic;\n" | |
1ec3f75a | 2611 | " uint8_t uuid[16];\n" |
d793d5e1 | 2612 | " uint32_t stream_id;\n" |
5594698f | 2613 | " uint64_t stream_instance_id;\n" |
0eb25f58 | 2614 | " };\n" |
d793d5e1 | 2615 | "};\n\n", |
a90917c3 MD |
2616 | lttng_alignof(uint8_t) * CHAR_BIT, |
2617 | lttng_alignof(uint16_t) * CHAR_BIT, | |
2618 | lttng_alignof(uint32_t) * CHAR_BIT, | |
2619 | lttng_alignof(uint64_t) * CHAR_BIT, | |
a9afe705 MD |
2620 | sizeof(unsigned long) * CHAR_BIT, |
2621 | lttng_alignof(unsigned long) * CHAR_BIT, | |
c6c9e10f MD |
2622 | CTF_SPEC_MAJOR, |
2623 | CTF_SPEC_MINOR, | |
d793d5e1 | 2624 | uuid_s, |
5214fa50 | 2625 | #if __BYTE_ORDER == __BIG_ENDIAN |
d793d5e1 MD |
2626 | "be" |
2627 | #else | |
2628 | "le" | |
2629 | #endif | |
2630 | ); | |
2631 | if (ret) | |
2632 | goto end; | |
2633 | ||
99dc9597 MD |
2634 | ret = lttng_metadata_printf(session, |
2635 | "env {\n" | |
a6058143 | 2636 | " hostname = \"%s\";\n" |
c6c9e10f | 2637 | " domain = \"kernel\";\n" |
99dc9597 | 2638 | " sysname = \"%s\";\n" |
c6c9e10f MD |
2639 | " kernel_release = \"%s\";\n" |
2640 | " kernel_version = \"%s\";\n" | |
2641 | " tracer_name = \"lttng-modules\";\n" | |
2642 | " tracer_major = %d;\n" | |
2643 | " tracer_minor = %d;\n" | |
2644 | " tracer_patchlevel = %d;\n" | |
3eb95be4 | 2645 | " trace_buffering_scheme = \"global\";\n", |
3d0d43db | 2646 | current->nsproxy->uts_ns->name.nodename, |
99dc9597 MD |
2647 | utsname()->sysname, |
2648 | utsname()->release, | |
c6c9e10f MD |
2649 | utsname()->version, |
2650 | LTTNG_MODULES_MAJOR_VERSION, | |
2651 | LTTNG_MODULES_MINOR_VERSION, | |
2652 | LTTNG_MODULES_PATCHLEVEL_VERSION | |
99dc9597 MD |
2653 | ); |
2654 | if (ret) | |
2655 | goto end; | |
2656 | ||
1c88f269 JR |
2657 | ret = print_metadata_escaped_field(session, "trace_name", session->name); |
2658 | if (ret) | |
2659 | goto end; | |
2660 | ret = print_metadata_escaped_field(session, "trace_creation_datetime", | |
2661 | session->creation_time); | |
3eb95be4 JR |
2662 | if (ret) |
2663 | goto end; | |
2664 | ||
c88f762e GB |
2665 | /* Add the product UUID to the 'env' section */ |
2666 | product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID); | |
2667 | if (product_uuid) { | |
2668 | ret = lttng_metadata_printf(session, | |
2669 | " product_uuid = \"%s\";\n", | |
2670 | product_uuid | |
2671 | ); | |
2672 | if (ret) | |
2673 | goto end; | |
2674 | } | |
2675 | ||
2676 | /* Close the 'env' section */ | |
3eb95be4 JR |
2677 | ret = lttng_metadata_printf(session, "};\n\n"); |
2678 | if (ret) | |
2679 | goto end; | |
2680 | ||
a3ccff4f MD |
2681 | ret = lttng_metadata_printf(session, |
2682 | "clock {\n" | |
2754583e MD |
2683 | " name = \"%s\";\n", |
2684 | trace_clock_name() | |
a82c63f1 MD |
2685 | ); |
2686 | if (ret) | |
2687 | goto end; | |
2688 | ||
2689 | if (!trace_clock_uuid(clock_uuid_s)) { | |
2690 | ret = lttng_metadata_printf(session, | |
7c27cb17 | 2691 | " uuid = \"%s\";\n", |
a82c63f1 MD |
2692 | clock_uuid_s |
2693 | ); | |
2694 | if (ret) | |
2695 | goto end; | |
2696 | } | |
2697 | ||
2698 | ret = lttng_metadata_printf(session, | |
2754583e | 2699 | " description = \"%s\";\n" |
a3ccff4f MD |
2700 | " freq = %llu; /* Frequency, in Hz */\n" |
2701 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
8967b2a3 | 2702 | " offset = %lld;\n" |
a3ccff4f | 2703 | "};\n\n", |
2754583e | 2704 | trace_clock_description(), |
a3ccff4f | 2705 | (unsigned long long) trace_clock_freq(), |
8967b2a3 | 2706 | (long long) measure_clock_offset() |
a3ccff4f MD |
2707 | ); |
2708 | if (ret) | |
2709 | goto end; | |
2710 | ||
2711 | ret = lttng_metadata_printf(session, | |
2712 | "typealias integer {\n" | |
2713 | " size = 27; align = 1; signed = false;\n" | |
2754583e | 2714 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2715 | "} := uint27_clock_monotonic_t;\n" |
2716 | "\n" | |
2717 | "typealias integer {\n" | |
2718 | " size = 32; align = %u; signed = false;\n" | |
2754583e | 2719 | " map = clock.%s.value;\n" |
a3ccff4f MD |
2720 | "} := uint32_clock_monotonic_t;\n" |
2721 | "\n" | |
2722 | "typealias integer {\n" | |
2723 | " size = 64; align = %u; signed = false;\n" | |
2754583e | 2724 | " map = clock.%s.value;\n" |
a3ccff4f | 2725 | "} := uint64_clock_monotonic_t;\n\n", |
2754583e | 2726 | trace_clock_name(), |
a3ccff4f | 2727 | lttng_alignof(uint32_t) * CHAR_BIT, |
2754583e MD |
2728 | trace_clock_name(), |
2729 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2730 | trace_clock_name() | |
a3ccff4f MD |
2731 | ); |
2732 | if (ret) | |
2733 | goto end; | |
2734 | ||
a90917c3 | 2735 | ret = _lttng_stream_packet_context_declare(session); |
9115fbdc MD |
2736 | if (ret) |
2737 | goto end; | |
2738 | ||
a90917c3 | 2739 | ret = _lttng_event_header_declare(session); |
9115fbdc MD |
2740 | if (ret) |
2741 | goto end; | |
2742 | ||
c099397a MD |
2743 | skip_session: |
2744 | list_for_each_entry(chan, &session->chan, list) { | |
a90917c3 | 2745 | ret = _lttng_channel_metadata_statedump(session, chan); |
c099397a MD |
2746 | if (ret) |
2747 | goto end; | |
2748 | } | |
2749 | ||
2750 | list_for_each_entry(event, &session->events, list) { | |
a90917c3 | 2751 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
c099397a MD |
2752 | if (ret) |
2753 | goto end; | |
2754 | } | |
2755 | session->metadata_dumped = 1; | |
2756 | end: | |
2757 | return ret; | |
2758 | } | |
2759 | ||
c0e31d2e | 2760 | /** |
a90917c3 | 2761 | * lttng_transport_register - LTT transport registration |
c0e31d2e MD |
2762 | * @transport: transport structure |
2763 | * | |
2764 | * Registers a transport which can be used as output to extract the data out of | |
c50bdba2 | 2765 | * LTTng. |
c0e31d2e | 2766 | */ |
a90917c3 | 2767 | void lttng_transport_register(struct lttng_transport *transport) |
c0e31d2e | 2768 | { |
c0e31d2e | 2769 | mutex_lock(&sessions_mutex); |
a90917c3 | 2770 | list_add_tail(&transport->node, <tng_transport_list); |
c0e31d2e MD |
2771 | mutex_unlock(&sessions_mutex); |
2772 | } | |
a90917c3 | 2773 | EXPORT_SYMBOL_GPL(lttng_transport_register); |
c0e31d2e MD |
2774 | |
2775 | /** | |
a90917c3 | 2776 | * lttng_transport_unregister - LTT transport unregistration |
c0e31d2e MD |
2777 | * @transport: transport structure |
2778 | */ | |
a90917c3 | 2779 | void lttng_transport_unregister(struct lttng_transport *transport) |
c0e31d2e MD |
2780 | { |
2781 | mutex_lock(&sessions_mutex); | |
2782 | list_del(&transport->node); | |
2783 | mutex_unlock(&sessions_mutex); | |
2784 | } | |
a90917c3 | 2785 | EXPORT_SYMBOL_GPL(lttng_transport_unregister); |
c0e31d2e | 2786 | |
1e367326 MD |
2787 | enum cpuhp_state lttng_hp_prepare; |
2788 | enum cpuhp_state lttng_hp_online; | |
2789 | ||
2790 | static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node) | |
2791 | { | |
2792 | struct lttng_cpuhp_node *lttng_node; | |
2793 | ||
2794 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2795 | switch (lttng_node->component) { | |
2796 | case LTTNG_RING_BUFFER_FRONTEND: | |
2797 | return 0; | |
2798 | case LTTNG_RING_BUFFER_BACKEND: | |
2799 | return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node); | |
2800 | case LTTNG_RING_BUFFER_ITER: | |
2801 | return 0; | |
2802 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2803 | return 0; | |
2804 | default: | |
2805 | return -EINVAL; | |
2806 | } | |
2807 | } | |
2808 | ||
2809 | static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node) | |
2810 | { | |
2811 | struct lttng_cpuhp_node *lttng_node; | |
2812 | ||
2813 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2814 | switch (lttng_node->component) { | |
2815 | case LTTNG_RING_BUFFER_FRONTEND: | |
2816 | return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node); | |
2817 | case LTTNG_RING_BUFFER_BACKEND: | |
2818 | return 0; | |
2819 | case LTTNG_RING_BUFFER_ITER: | |
2820 | return 0; | |
2821 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2822 | return lttng_cpuhp_perf_counter_dead(cpu, lttng_node); | |
2823 | default: | |
2824 | return -EINVAL; | |
2825 | } | |
2826 | } | |
2827 | ||
2828 | static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node) | |
2829 | { | |
2830 | struct lttng_cpuhp_node *lttng_node; | |
2831 | ||
2832 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2833 | switch (lttng_node->component) { | |
2834 | case LTTNG_RING_BUFFER_FRONTEND: | |
2835 | return lttng_cpuhp_rb_frontend_online(cpu, lttng_node); | |
2836 | case LTTNG_RING_BUFFER_BACKEND: | |
2837 | return 0; | |
2838 | case LTTNG_RING_BUFFER_ITER: | |
2839 | return lttng_cpuhp_rb_iter_online(cpu, lttng_node); | |
2840 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2841 | return lttng_cpuhp_perf_counter_online(cpu, lttng_node); | |
2842 | default: | |
2843 | return -EINVAL; | |
2844 | } | |
2845 | } | |
2846 | ||
2847 | static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node) | |
2848 | { | |
2849 | struct lttng_cpuhp_node *lttng_node; | |
2850 | ||
2851 | lttng_node = container_of(node, struct lttng_cpuhp_node, node); | |
2852 | switch (lttng_node->component) { | |
2853 | case LTTNG_RING_BUFFER_FRONTEND: | |
2854 | return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node); | |
2855 | case LTTNG_RING_BUFFER_BACKEND: | |
2856 | return 0; | |
2857 | case LTTNG_RING_BUFFER_ITER: | |
2858 | return 0; | |
2859 | case LTTNG_CONTEXT_PERF_COUNTERS: | |
2860 | return 0; | |
2861 | default: | |
2862 | return -EINVAL; | |
2863 | } | |
2864 | } | |
2865 | ||
2866 | static int __init lttng_init_cpu_hotplug(void) | |
2867 | { | |
2868 | int ret; | |
2869 | ||
2870 | ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare", | |
2871 | lttng_hotplug_prepare, | |
2872 | lttng_hotplug_dead); | |
2873 | if (ret < 0) { | |
2874 | return ret; | |
2875 | } | |
2876 | lttng_hp_prepare = ret; | |
2877 | lttng_rb_set_hp_prepare(ret); | |
2878 | ||
2879 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online", | |
2880 | lttng_hotplug_online, | |
2881 | lttng_hotplug_offline); | |
2882 | if (ret < 0) { | |
2883 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2884 | lttng_hp_prepare = 0; | |
2885 | return ret; | |
2886 | } | |
2887 | lttng_hp_online = ret; | |
2888 | lttng_rb_set_hp_online(ret); | |
2889 | ||
2890 | return 0; | |
2891 | } | |
2892 | ||
2893 | static void __exit lttng_exit_cpu_hotplug(void) | |
2894 | { | |
2895 | lttng_rb_set_hp_online(0); | |
2896 | cpuhp_remove_multi_state(lttng_hp_online); | |
2897 | lttng_rb_set_hp_prepare(0); | |
2898 | cpuhp_remove_multi_state(lttng_hp_prepare); | |
2899 | } | |
2900 | ||
a90917c3 | 2901 | static int __init lttng_events_init(void) |
4e3c1b9b | 2902 | { |
1c25284c MD |
2903 | int ret; |
2904 | ||
114667d5 | 2905 | ret = lttng_probes_init(); |
389d7070 MD |
2906 | if (ret) |
2907 | return ret; | |
07dfc1d0 | 2908 | ret = lttng_context_init(); |
20591cf7 MD |
2909 | if (ret) |
2910 | return ret; | |
07dfc1d0 MD |
2911 | ret = lttng_tracepoint_init(); |
2912 | if (ret) | |
2913 | goto error_tp; | |
a90917c3 | 2914 | event_cache = KMEM_CACHE(lttng_event, 0); |
20591cf7 MD |
2915 | if (!event_cache) { |
2916 | ret = -ENOMEM; | |
2917 | goto error_kmem; | |
2918 | } | |
80996790 | 2919 | ret = lttng_abi_init(); |
02119ee5 MD |
2920 | if (ret) |
2921 | goto error_abi; | |
0c956676 MD |
2922 | ret = lttng_logger_init(); |
2923 | if (ret) | |
2924 | goto error_logger; | |
1e367326 MD |
2925 | ret = lttng_init_cpu_hotplug(); |
2926 | if (ret) | |
2927 | goto error_hotplug; | |
101215b7 | 2928 | printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2929 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2930 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2931 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2932 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2933 | LTTNG_VERSION_NAME, |
2934 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2935 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2936 | #else | |
2937 | "", | |
2938 | #endif | |
2939 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2940 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2941 | #else | |
2942 | ""); | |
2943 | #endif | |
4e3c1b9b | 2944 | return 0; |
0c956676 | 2945 | |
1e367326 MD |
2946 | error_hotplug: |
2947 | lttng_logger_exit(); | |
0c956676 MD |
2948 | error_logger: |
2949 | lttng_abi_exit(); | |
02119ee5 | 2950 | error_abi: |
1c25284c | 2951 | kmem_cache_destroy(event_cache); |
20591cf7 MD |
2952 | error_kmem: |
2953 | lttng_tracepoint_exit(); | |
07dfc1d0 MD |
2954 | error_tp: |
2955 | lttng_context_exit(); | |
101215b7 | 2956 | printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2957 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2958 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2959 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2960 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2961 | LTTNG_VERSION_NAME, |
2962 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2963 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2964 | #else | |
2965 | "", | |
2966 | #endif | |
2967 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
2968 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
2969 | #else | |
2970 | ""); | |
2971 | #endif | |
1c25284c | 2972 | return ret; |
4e3c1b9b MD |
2973 | } |
2974 | ||
a90917c3 | 2975 | module_init(lttng_events_init); |
11b5a3c2 | 2976 | |
a90917c3 | 2977 | static void __exit lttng_events_exit(void) |
4e3c1b9b | 2978 | { |
a90917c3 | 2979 | struct lttng_session *session, *tmpsession; |
92e94819 | 2980 | |
1e367326 | 2981 | lttng_exit_cpu_hotplug(); |
0c956676 | 2982 | lttng_logger_exit(); |
80996790 | 2983 | lttng_abi_exit(); |
92e94819 | 2984 | list_for_each_entry_safe(session, tmpsession, &sessions, list) |
a90917c3 | 2985 | lttng_session_destroy(session); |
11b5a3c2 | 2986 | kmem_cache_destroy(event_cache); |
20591cf7 | 2987 | lttng_tracepoint_exit(); |
07dfc1d0 | 2988 | lttng_context_exit(); |
101215b7 | 2989 | printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n", |
489de24b MJ |
2990 | __stringify(LTTNG_MODULES_MAJOR_VERSION), |
2991 | __stringify(LTTNG_MODULES_MINOR_VERSION), | |
2992 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION), | |
2993 | LTTNG_MODULES_EXTRAVERSION, | |
101215b7 MJ |
2994 | LTTNG_VERSION_NAME, |
2995 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
2996 | LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT, | |
2997 | #else | |
2998 | "", | |
2999 | #endif | |
3000 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3001 | LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME); | |
3002 | #else | |
3003 | ""); | |
3004 | #endif | |
4e3c1b9b | 3005 | } |
92e94819 | 3006 | |
a90917c3 | 3007 | module_exit(lttng_events_exit); |
11b5a3c2 | 3008 | |
101215b7 MJ |
3009 | #include "extra_version/patches.i" |
3010 | #ifdef LTTNG_EXTRA_VERSION_GIT | |
3011 | MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT); | |
3012 | #endif | |
3013 | #ifdef LTTNG_EXTRA_VERSION_NAME | |
3014 | MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME); | |
3015 | #endif | |
92e94819 MD |
3016 | MODULE_LICENSE("GPL and additional rights"); |
3017 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
1c124020 | 3018 | MODULE_DESCRIPTION("LTTng tracer"); |
9a9973ef MD |
3019 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
3020 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
309370e2 MD |
3021 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) |
3022 | LTTNG_MODULES_EXTRAVERSION); |