run_as: add extract SDT probe offsets command
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.c
CommitLineData
54012638
DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
d14d33bf
AM
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
54012638
DG
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
d14d33bf
AM
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
54012638
DG
16 */
17
6c1c0768 18#define _LGPL_SOURCE
54012638
DG
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
c363b55d 22#include <unistd.h>
54012638 23
990570ed
DG
24#include <common/common.h>
25#include <common/defaults.h>
1e307fab 26
00e2e675 27#include "consumer.h"
62499ad6 28#include "trace-kernel.h"
e9404c27
JG
29#include "lttng-sessiond.h"
30#include "notification-thread-commands.h"
54012638 31
19e70852 32/*
050349bb 33 * Find the channel name for the given kernel session.
19e70852 34 */
62499ad6 35struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
19e70852
DG
36 char *name, struct ltt_kernel_session *session)
37{
38 struct ltt_kernel_channel *chan;
39
0525e9ae
DG
40 assert(session);
41 assert(name);
19e70852 42
85076754
MD
43 /*
44 * If we receive an empty string for channel name, it means the
45 * default channel name is requested.
46 */
47 if (name[0] == '\0')
48 name = DEFAULT_CHANNEL_NAME;
49
54d01ffb
DG
50 DBG("Trying to find channel %s", name);
51
19e70852
DG
52 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
53 if (strcmp(name, chan->channel->name) == 0) {
54 DBG("Found channel by name %s", name);
55 return chan;
56 }
57 }
58
19e70852
DG
59 return NULL;
60}
61
00a62084
MD
62/*
63 * Find the event for the given channel.
64 */
65struct ltt_kernel_event *trace_kernel_find_event(
66 char *name, struct ltt_kernel_channel *channel,
67 enum lttng_event_type type,
68 struct lttng_filter_bytecode *filter)
69{
70 struct ltt_kernel_event *ev;
71 int found = 0;
72
73 assert(name);
74 assert(channel);
75
76 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
77 if (type != LTTNG_EVENT_ALL && ev->type != type) {
78 continue;
79 }
80 if (strcmp(name, ev->event->name)) {
81 continue;
82 }
83 if ((ev->filter && !filter) || (!ev->filter && filter)) {
84 continue;
85 }
86 if (ev->filter && filter) {
87 if (ev->filter->len != filter->len ||
88 memcmp(ev->filter->data, filter->data,
89 filter->len) != 0) {
90 continue;
91 }
92 }
93 found = 1;
94 break;
95 }
96 if (found) {
97 DBG("Found event %s for channel %s", name,
98 channel->channel->name);
99 return ev;
100 } else {
101 return NULL;
102 }
103}
104
19e70852 105/*
050349bb 106 * Find the event name for the given channel.
19e70852 107 */
62499ad6 108struct ltt_kernel_event *trace_kernel_get_event_by_name(
d0ae4ea8
MD
109 char *name, struct ltt_kernel_channel *channel,
110 enum lttng_event_type type)
19e70852
DG
111{
112 struct ltt_kernel_event *ev;
00a62084 113 int found = 0;
19e70852 114
0525e9ae
DG
115 assert(name);
116 assert(channel);
19e70852
DG
117
118 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
00a62084 119 if (type != LTTNG_EVENT_ALL && ev->type != type) {
d0ae4ea8 120 continue;
19e70852 121 }
00a62084
MD
122 if (strcmp(name, ev->event->name)) {
123 continue;
124 }
125 found = 1;
126 break;
127 }
128 if (found) {
129 DBG("Found event %s for channel %s", name,
130 channel->channel->name);
131 return ev;
132 } else {
133 return NULL;
19e70852 134 }
19e70852
DG
135}
136
54012638 137/*
050349bb 138 * Allocate and initialize a kernel session data structure.
54012638 139 *
050349bb 140 * Return pointer to structure or NULL.
54012638 141 */
dec56f6c 142struct ltt_kernel_session *trace_kernel_create_session(void)
54012638 143{
a4b92340 144 struct ltt_kernel_session *lks = NULL;
54012638
DG
145
146 /* Allocate a new ltt kernel session */
ba7f0ae5 147 lks = zmalloc(sizeof(struct ltt_kernel_session));
54012638 148 if (lks == NULL) {
df0f840b 149 PERROR("create kernel session zmalloc");
a4b92340 150 goto alloc_error;
54012638
DG
151 }
152
153 /* Init data structure */
03550b58
MD
154 lks->fd = -1;
155 lks->metadata_stream_fd = -1;
54012638
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156 lks->channel_count = 0;
157 lks->stream_count_global = 0;
158 lks->metadata = NULL;
159 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
160
00e2e675
DG
161 lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
162 if (lks->consumer == NULL) {
163 goto error;
164 }
165
54012638
DG
166 return lks;
167
168error:
a4b92340
DG
169 free(lks);
170
171alloc_error:
54012638
DG
172 return NULL;
173}
174
175/*
050349bb 176 * Allocate and initialize a kernel channel data structure.
54012638 177 *
050349bb 178 * Return pointer to structure or NULL.
54012638 179 */
00e2e675 180struct ltt_kernel_channel *trace_kernel_create_channel(
fdd9eb17 181 struct lttng_channel *chan)
54012638 182{
54012638 183 struct ltt_kernel_channel *lkc;
61a5b6b1 184 struct lttng_channel_extended *extended = NULL;
54012638 185
0525e9ae
DG
186 assert(chan);
187
ba7f0ae5 188 lkc = zmalloc(sizeof(struct ltt_kernel_channel));
f3ed775e 189 if (lkc == NULL) {
df0f840b 190 PERROR("ltt_kernel_channel zmalloc");
54012638
DG
191 goto error;
192 }
193
ba7f0ae5 194 lkc->channel = zmalloc(sizeof(struct lttng_channel));
f3ed775e 195 if (lkc->channel == NULL) {
df0f840b 196 PERROR("lttng_channel zmalloc");
e9404c27
JG
197 goto error;
198 }
199
200 extended = zmalloc(sizeof(struct lttng_channel_extended));
201 if (!extended) {
202 PERROR("lttng_channel_channel zmalloc");
f3ed775e
DG
203 goto error;
204 }
205 memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
e9404c27
JG
206 memcpy(extended, chan->attr.extended.ptr, sizeof(struct lttng_channel_extended));
207 lkc->channel->attr.extended.ptr = extended;
208 extended = NULL;
54012638 209
85076754
MD
210 /*
211 * If we receive an empty string for channel name, it means the
212 * default channel name is requested.
213 */
214 if (chan->name[0] == '\0') {
215 strncpy(lkc->channel->name, DEFAULT_CHANNEL_NAME,
216 sizeof(lkc->channel->name));
217 }
bd722d76 218 lkc->channel->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
85076754 219
03550b58 220 lkc->fd = -1;
54012638 221 lkc->stream_count = 0;
cbbbb275 222 lkc->event_count = 0;
d36b8583 223 lkc->enabled = 1;
753873bf 224 lkc->published_to_notification_thread = false;
54012638
DG
225 /* Init linked list */
226 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
227 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
645328ae 228 CDS_INIT_LIST_HEAD(&lkc->ctx_list);
54012638
DG
229
230 return lkc;
231
232error:
e9404c27
JG
233 if (lkc) {
234 free(lkc->channel);
235 }
236 free(extended);
237 free(lkc);
54012638
DG
238 return NULL;
239}
240
645328ae
DG
241/*
242 * Allocate and init a kernel context object.
243 *
244 * Return the allocated object or NULL on error.
245 */
246struct ltt_kernel_context *trace_kernel_create_context(
247 struct lttng_kernel_context *ctx)
248{
249 struct ltt_kernel_context *kctx;
250
251 kctx = zmalloc(sizeof(*kctx));
252 if (!kctx) {
253 PERROR("zmalloc kernel context");
254 goto error;
255 }
256
257 if (ctx) {
258 memcpy(&kctx->ctx, ctx, sizeof(kctx->ctx));
259 }
df3c77c8
JG
260error:
261 return kctx;
262}
645328ae 263
df3c77c8
JG
264/*
265 * Allocate and init a kernel context object from an existing kernel context
266 * object.
267 *
268 * Return the allocated object or NULL on error.
269 */
270struct ltt_kernel_context *trace_kernel_copy_context(
271 struct ltt_kernel_context *kctx)
272{
273 struct ltt_kernel_context *kctx_copy;
274
275 assert(kctx);
276 kctx_copy = zmalloc(sizeof(*kctx_copy));
277 if (!kctx_copy) {
278 PERROR("zmalloc ltt_kernel_context");
279 goto error;
280 }
281
282 memcpy(kctx_copy, kctx, sizeof(*kctx_copy));
283 memset(&kctx_copy->list, 0, sizeof(kctx_copy->list));
7b9445b3 284
645328ae 285error:
df3c77c8 286 return kctx_copy;
645328ae
DG
287}
288
54012638 289/*
050349bb 290 * Allocate and initialize a kernel event. Set name and event type.
a969e101 291 * We own filter_expression, and filter.
54012638 292 *
050349bb 293 * Return pointer to structure or NULL.
54012638 294 */
00a62084
MD
295struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev,
296 char *filter_expression, struct lttng_filter_bytecode *filter)
54012638
DG
297{
298 struct ltt_kernel_event *lke;
299 struct lttng_kernel_event *attr;
300
0525e9ae
DG
301 assert(ev);
302
ba7f0ae5
DG
303 lke = zmalloc(sizeof(struct ltt_kernel_event));
304 attr = zmalloc(sizeof(struct lttng_kernel_event));
54012638 305 if (lke == NULL || attr == NULL) {
df0f840b 306 PERROR("kernel event zmalloc");
54012638
DG
307 goto error;
308 }
309
f3ed775e 310 switch (ev->type) {
7d29a247 311 case LTTNG_EVENT_PROBE:
e6ddca71 312 attr->instrumentation = LTTNG_KERNEL_KPROBE;
7d29a247
DG
313 attr->u.kprobe.addr = ev->attr.probe.addr;
314 attr->u.kprobe.offset = ev->attr.probe.offset;
f3ed775e 315 strncpy(attr->u.kprobe.symbol_name,
dbbb3ec5
DG
316 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
317 attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e
DG
318 break;
319 case LTTNG_EVENT_FUNCTION:
8f0d098b
MD
320 attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
321 attr->u.kretprobe.addr = ev->attr.probe.addr;
322 attr->u.kretprobe.offset = ev->attr.probe.offset;
8f0d098b 323 strncpy(attr->u.kretprobe.symbol_name,
dbbb3ec5
DG
324 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
325 attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
8f0d098b
MD
326 break;
327 case LTTNG_EVENT_FUNCTION_ENTRY:
f3ed775e
DG
328 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
329 strncpy(attr->u.ftrace.symbol_name,
dbbb3ec5
DG
330 ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
331 attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 332 break;
e6ddca71
DG
333 case LTTNG_EVENT_TRACEPOINT:
334 attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
f3ed775e 335 break;
a54bd42d
MD
336 case LTTNG_EVENT_SYSCALL:
337 attr->instrumentation = LTTNG_KERNEL_SYSCALL;
0133c199 338 break;
7a3d1328
MD
339 case LTTNG_EVENT_ALL:
340 attr->instrumentation = LTTNG_KERNEL_ALL;
341 break;
f3ed775e
DG
342 default:
343 ERR("Unknown kernel instrumentation type (%d)", ev->type);
344 goto error;
345 }
346
347 /* Copy event name */
dbbb3ec5
DG
348 strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN);
349 attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 350
54012638 351 /* Setting up a kernel event */
03550b58 352 lke->fd = -1;
54012638 353 lke->event = attr;
d36b8583 354 lke->enabled = 1;
00a62084
MD
355 lke->filter_expression = filter_expression;
356 lke->filter = filter;
54012638
DG
357
358 return lke;
359
360error:
a969e101
MD
361 free(filter_expression);
362 free(filter);
a2c0da86
MD
363 free(lke);
364 free(attr);
54012638
DG
365 return NULL;
366}
367
368/*
050349bb 369 * Allocate and initialize a kernel metadata.
54012638 370 *
050349bb 371 * Return pointer to structure or NULL.
54012638 372 */
a4b92340 373struct ltt_kernel_metadata *trace_kernel_create_metadata(void)
54012638 374{
54012638 375 struct ltt_kernel_metadata *lkm;
f3ed775e 376 struct lttng_channel *chan;
54012638 377
ba7f0ae5
DG
378 lkm = zmalloc(sizeof(struct ltt_kernel_metadata));
379 chan = zmalloc(sizeof(struct lttng_channel));
f3ed775e 380 if (lkm == NULL || chan == NULL) {
df0f840b 381 PERROR("kernel metadata zmalloc");
54012638
DG
382 goto error;
383 }
384
385 /* Set default attributes */
f3ed775e 386 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
3e230f92 387 chan->attr.subbuf_size = default_get_metadata_subbuf_size();
b389abbe 388 chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
6bb9e85f
MD
389 chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
390 chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
7d452e12 391 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
54012638
DG
392
393 /* Init metadata */
03550b58 394 lkm->fd = -1;
f3ed775e 395 lkm->conf = chan;
54012638
DG
396
397 return lkm;
398
399error:
a2c0da86
MD
400 free(lkm);
401 free(chan);
54012638
DG
402 return NULL;
403}
404
405/*
050349bb
DG
406 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
407 * default.
54012638 408 *
050349bb 409 * Return pointer to structure or NULL.
54012638 410 */
00e2e675
DG
411struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
412 unsigned int count)
54012638 413{
00e2e675 414 int ret;
54012638
DG
415 struct ltt_kernel_stream *lks;
416
0525e9ae
DG
417 assert(name);
418
ba7f0ae5 419 lks = zmalloc(sizeof(struct ltt_kernel_stream));
54012638 420 if (lks == NULL) {
df0f840b 421 PERROR("kernel stream zmalloc");
54012638
DG
422 goto error;
423 }
424
00e2e675 425 /* Set name */
535b8ff4 426 ret = snprintf(lks->name, sizeof(lks->name), "%s_%u", name, count);
00e2e675
DG
427 if (ret < 0) {
428 PERROR("snprintf stream name");
429 goto error;
430 }
431 lks->name[sizeof(lks->name) - 1] = '\0';
432
54012638 433 /* Init stream */
03550b58 434 lks->fd = -1;
54012638 435 lks->state = 0;
ffe60014 436 lks->cpu = count;
54012638
DG
437
438 return lks;
439
440error:
441 return NULL;
442}
c363b55d 443
050349bb
DG
444/*
445 * Cleanup kernel stream structure.
446 */
62499ad6 447void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
c363b55d 448{
0525e9ae
DG
449 assert(stream);
450
33a2b854 451 DBG("[trace] Closing stream fd %d", stream->fd);
c363b55d 452 /* Close kernel fd */
03550b58 453 if (stream->fd >= 0) {
c617c0c6
MD
454 int ret;
455
03550b58
MD
456 ret = close(stream->fd);
457 if (ret) {
458 PERROR("close");
459 }
799e2c4f 460 }
c363b55d
DG
461 /* Remove from stream list */
462 cds_list_del(&stream->list);
f9815039 463
c363b55d
DG
464 free(stream);
465}
466
050349bb
DG
467/*
468 * Cleanup kernel event structure.
469 */
62499ad6 470void trace_kernel_destroy_event(struct ltt_kernel_event *event)
c363b55d 471{
0525e9ae
DG
472 assert(event);
473
87eb4ab8 474 if (event->fd >= 0) {
c617c0c6
MD
475 int ret;
476
87eb4ab8
MD
477 DBG("[trace] Closing event fd %d", event->fd);
478 /* Close kernel fd */
799e2c4f
MD
479 ret = close(event->fd);
480 if (ret) {
481 PERROR("close");
482 }
87eb4ab8
MD
483 } else {
484 DBG("[trace] Tearing down event (no associated fd)");
485 }
c363b55d
DG
486
487 /* Remove from event list */
488 cds_list_del(&event->list);
f9815039 489
00a62084
MD
490 free(event->filter_expression);
491 free(event->filter);
492
f9815039 493 free(event->event);
c363b55d
DG
494 free(event);
495}
496
645328ae
DG
497/*
498 * Cleanup kernel context structure.
499 */
500void trace_kernel_destroy_context(struct ltt_kernel_context *ctx)
501{
502 assert(ctx);
503
ba985c3a
JG
504 if (ctx->in_list) {
505 cds_list_del(&ctx->list);
506 }
645328ae
DG
507 free(ctx);
508}
509
050349bb
DG
510/*
511 * Cleanup kernel channel structure.
512 */
62499ad6 513void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
c363b55d 514{
af9737e9
DG
515 struct ltt_kernel_stream *stream, *stmp;
516 struct ltt_kernel_event *event, *etmp;
645328ae 517 struct ltt_kernel_context *ctx, *ctmp;
799e2c4f 518 int ret;
e9404c27 519 enum lttng_error_code status;
c363b55d 520
0525e9ae
DG
521 assert(channel);
522
33a2b854 523 DBG("[trace] Closing channel fd %d", channel->fd);
c363b55d 524 /* Close kernel fd */
03550b58
MD
525 if (channel->fd >= 0) {
526 ret = close(channel->fd);
527 if (ret) {
528 PERROR("close");
529 }
799e2c4f 530 }
c363b55d
DG
531
532 /* For each stream in the channel list */
af9737e9 533 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
62499ad6 534 trace_kernel_destroy_stream(stream);
c363b55d
DG
535 }
536
537 /* For each event in the channel list */
af9737e9 538 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
62499ad6 539 trace_kernel_destroy_event(event);
c363b55d
DG
540 }
541
645328ae
DG
542 /* For each context in the channel list */
543 cds_list_for_each_entry_safe(ctx, ctmp, &channel->ctx_list, list) {
544 trace_kernel_destroy_context(ctx);
545 }
546
c363b55d
DG
547 /* Remove from channel list */
548 cds_list_del(&channel->list);
f9815039 549
753873bf
JR
550 if (notification_thread_handle
551 && channel->published_to_notification_thread) {
63aaa3dc
JG
552 status = notification_thread_command_remove_channel(
553 notification_thread_handle,
e1f3997a 554 channel->key, LTTNG_DOMAIN_KERNEL);
63aaa3dc
JG
555 assert(status == LTTNG_OK);
556 }
e9404c27 557 free(channel->channel->attr.extended.ptr);
f9815039 558 free(channel->channel);
c363b55d
DG
559 free(channel);
560}
561
050349bb
DG
562/*
563 * Cleanup kernel metadata structure.
564 */
62499ad6 565void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
c363b55d 566{
0525e9ae
DG
567 assert(metadata);
568
33a2b854 569 DBG("[trace] Closing metadata fd %d", metadata->fd);
c363b55d 570 /* Close kernel fd */
03550b58 571 if (metadata->fd >= 0) {
c617c0c6
MD
572 int ret;
573
03550b58
MD
574 ret = close(metadata->fd);
575 if (ret) {
576 PERROR("close");
577 }
799e2c4f 578 }
c363b55d 579
f9815039 580 free(metadata->conf);
c363b55d
DG
581 free(metadata);
582}
583
050349bb 584/*
62499ad6 585 * Cleanup kernel session structure
36b588ed
MD
586 *
587 * Should *NOT* be called with RCU read-side lock held.
050349bb 588 */
62499ad6 589void trace_kernel_destroy_session(struct ltt_kernel_session *session)
c363b55d 590{
af9737e9 591 struct ltt_kernel_channel *channel, *ctmp;
799e2c4f 592 int ret;
c363b55d 593
0525e9ae
DG
594 assert(session);
595
33a2b854 596 DBG("[trace] Closing session fd %d", session->fd);
c363b55d 597 /* Close kernel fds */
03550b58
MD
598 if (session->fd >= 0) {
599 ret = close(session->fd);
600 if (ret) {
601 PERROR("close");
602 }
799e2c4f 603 }
f9815039 604
03550b58 605 if (session->metadata_stream_fd >= 0) {
70dc1c34 606 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
799e2c4f
MD
607 ret = close(session->metadata_stream_fd);
608 if (ret) {
609 PERROR("close");
610 }
70dc1c34 611 }
c363b55d 612
d36b8583 613 if (session->metadata != NULL) {
62499ad6 614 trace_kernel_destroy_metadata(session->metadata);
d36b8583 615 }
c363b55d 616
af9737e9 617 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
62499ad6 618 trace_kernel_destroy_channel(channel);
c363b55d
DG
619 }
620
00e2e675 621 /* Wipe consumer output object */
6addfa37 622 consumer_output_put(session->consumer);
00e2e675 623
c363b55d
DG
624 free(session);
625}
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