Tests: kernel wildcards
[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.
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16 */
17
18#define _GNU_SOURCE
6c1c0768 19#define _LGPL_SOURCE
54012638
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20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
c363b55d 23#include <unistd.h>
54012638 24
990570ed
DG
25#include <common/common.h>
26#include <common/defaults.h>
1e307fab 27
00e2e675 28#include "consumer.h"
62499ad6 29#include "trace-kernel.h"
54012638 30
19e70852 31/*
050349bb 32 * Find the channel name for the given kernel session.
19e70852 33 */
62499ad6 34struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
19e70852
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35 char *name, struct ltt_kernel_session *session)
36{
37 struct ltt_kernel_channel *chan;
38
0525e9ae
DG
39 assert(session);
40 assert(name);
19e70852 41
85076754
MD
42 /*
43 * If we receive an empty string for channel name, it means the
44 * default channel name is requested.
45 */
46 if (name[0] == '\0')
47 name = DEFAULT_CHANNEL_NAME;
48
54d01ffb
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49 DBG("Trying to find channel %s", name);
50
19e70852
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51 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
52 if (strcmp(name, chan->channel->name) == 0) {
53 DBG("Found channel by name %s", name);
54 return chan;
55 }
56 }
57
19e70852
DG
58 return NULL;
59}
60
00a62084
MD
61/*
62 * Find the event for the given channel.
63 */
64struct ltt_kernel_event *trace_kernel_find_event(
65 char *name, struct ltt_kernel_channel *channel,
66 enum lttng_event_type type,
67 struct lttng_filter_bytecode *filter)
68{
69 struct ltt_kernel_event *ev;
70 int found = 0;
71
72 assert(name);
73 assert(channel);
74
75 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
76 if (type != LTTNG_EVENT_ALL && ev->type != type) {
77 continue;
78 }
79 if (strcmp(name, ev->event->name)) {
80 continue;
81 }
82 if ((ev->filter && !filter) || (!ev->filter && filter)) {
83 continue;
84 }
85 if (ev->filter && filter) {
86 if (ev->filter->len != filter->len ||
87 memcmp(ev->filter->data, filter->data,
88 filter->len) != 0) {
89 continue;
90 }
91 }
92 found = 1;
93 break;
94 }
95 if (found) {
96 DBG("Found event %s for channel %s", name,
97 channel->channel->name);
98 return ev;
99 } else {
100 return NULL;
101 }
102}
103
19e70852 104/*
050349bb 105 * Find the event name for the given channel.
19e70852 106 */
62499ad6 107struct ltt_kernel_event *trace_kernel_get_event_by_name(
d0ae4ea8
MD
108 char *name, struct ltt_kernel_channel *channel,
109 enum lttng_event_type type)
19e70852
DG
110{
111 struct ltt_kernel_event *ev;
00a62084 112 int found = 0;
19e70852 113
0525e9ae
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114 assert(name);
115 assert(channel);
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116
117 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
00a62084 118 if (type != LTTNG_EVENT_ALL && ev->type != type) {
d0ae4ea8 119 continue;
19e70852 120 }
00a62084
MD
121 if (strcmp(name, ev->event->name)) {
122 continue;
123 }
124 found = 1;
125 break;
126 }
127 if (found) {
128 DBG("Found event %s for channel %s", name,
129 channel->channel->name);
130 return ev;
131 } else {
132 return NULL;
19e70852 133 }
19e70852
DG
134}
135
54012638 136/*
050349bb 137 * Allocate and initialize a kernel session data structure.
54012638 138 *
050349bb 139 * Return pointer to structure or NULL.
54012638 140 */
dec56f6c 141struct ltt_kernel_session *trace_kernel_create_session(void)
54012638 142{
a4b92340 143 struct ltt_kernel_session *lks = NULL;
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144
145 /* Allocate a new ltt kernel session */
ba7f0ae5 146 lks = zmalloc(sizeof(struct ltt_kernel_session));
54012638 147 if (lks == NULL) {
df0f840b 148 PERROR("create kernel session zmalloc");
a4b92340 149 goto alloc_error;
54012638
DG
150 }
151
152 /* Init data structure */
03550b58
MD
153 lks->fd = -1;
154 lks->metadata_stream_fd = -1;
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155 lks->channel_count = 0;
156 lks->stream_count_global = 0;
157 lks->metadata = NULL;
158 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
159
00e2e675
DG
160 lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
161 if (lks->consumer == NULL) {
162 goto error;
163 }
164
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165 return lks;
166
167error:
a4b92340
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168 free(lks);
169
170alloc_error:
54012638
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171 return NULL;
172}
173
174/*
050349bb 175 * Allocate and initialize a kernel channel data structure.
54012638 176 *
050349bb 177 * Return pointer to structure or NULL.
54012638 178 */
00e2e675 179struct ltt_kernel_channel *trace_kernel_create_channel(
fdd9eb17 180 struct lttng_channel *chan)
54012638 181{
54012638 182 struct ltt_kernel_channel *lkc;
54012638 183
0525e9ae
DG
184 assert(chan);
185
ba7f0ae5 186 lkc = zmalloc(sizeof(struct ltt_kernel_channel));
f3ed775e 187 if (lkc == NULL) {
df0f840b 188 PERROR("ltt_kernel_channel zmalloc");
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189 goto error;
190 }
191
ba7f0ae5 192 lkc->channel = zmalloc(sizeof(struct lttng_channel));
f3ed775e 193 if (lkc->channel == NULL) {
df0f840b 194 PERROR("lttng_channel zmalloc");
ed594980 195 free(lkc);
f3ed775e
DG
196 goto error;
197 }
198 memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
54012638 199
85076754
MD
200 /*
201 * If we receive an empty string for channel name, it means the
202 * default channel name is requested.
203 */
204 if (chan->name[0] == '\0') {
205 strncpy(lkc->channel->name, DEFAULT_CHANNEL_NAME,
206 sizeof(lkc->channel->name));
207 }
bd722d76 208 lkc->channel->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
85076754 209
03550b58 210 lkc->fd = -1;
54012638 211 lkc->stream_count = 0;
cbbbb275 212 lkc->event_count = 0;
d36b8583 213 lkc->enabled = 1;
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214 /* Init linked list */
215 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
216 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
645328ae 217 CDS_INIT_LIST_HEAD(&lkc->ctx_list);
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218
219 return lkc;
220
221error:
222 return NULL;
223}
224
645328ae
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225/*
226 * Allocate and init a kernel context object.
227 *
228 * Return the allocated object or NULL on error.
229 */
230struct ltt_kernel_context *trace_kernel_create_context(
231 struct lttng_kernel_context *ctx)
232{
233 struct ltt_kernel_context *kctx;
234
235 kctx = zmalloc(sizeof(*kctx));
236 if (!kctx) {
237 PERROR("zmalloc kernel context");
238 goto error;
239 }
240
241 if (ctx) {
242 memcpy(&kctx->ctx, ctx, sizeof(kctx->ctx));
243 }
244
7b9445b3
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245 CDS_INIT_LIST_HEAD(&kctx->list);
246
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247error:
248 return kctx;
249}
250
54012638 251/*
050349bb 252 * Allocate and initialize a kernel event. Set name and event type.
a969e101 253 * We own filter_expression, and filter.
54012638 254 *
050349bb 255 * Return pointer to structure or NULL.
54012638 256 */
00a62084
MD
257struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev,
258 char *filter_expression, struct lttng_filter_bytecode *filter)
54012638
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259{
260 struct ltt_kernel_event *lke;
261 struct lttng_kernel_event *attr;
262
0525e9ae
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263 assert(ev);
264
ba7f0ae5
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265 lke = zmalloc(sizeof(struct ltt_kernel_event));
266 attr = zmalloc(sizeof(struct lttng_kernel_event));
54012638 267 if (lke == NULL || attr == NULL) {
df0f840b 268 PERROR("kernel event zmalloc");
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DG
269 goto error;
270 }
271
f3ed775e 272 switch (ev->type) {
7d29a247 273 case LTTNG_EVENT_PROBE:
e6ddca71 274 attr->instrumentation = LTTNG_KERNEL_KPROBE;
7d29a247
DG
275 attr->u.kprobe.addr = ev->attr.probe.addr;
276 attr->u.kprobe.offset = ev->attr.probe.offset;
f3ed775e 277 strncpy(attr->u.kprobe.symbol_name,
dbbb3ec5
DG
278 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
279 attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e
DG
280 break;
281 case LTTNG_EVENT_FUNCTION:
8f0d098b
MD
282 attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
283 attr->u.kretprobe.addr = ev->attr.probe.addr;
284 attr->u.kretprobe.offset = ev->attr.probe.offset;
8f0d098b 285 strncpy(attr->u.kretprobe.symbol_name,
dbbb3ec5
DG
286 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
287 attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
8f0d098b
MD
288 break;
289 case LTTNG_EVENT_FUNCTION_ENTRY:
f3ed775e
DG
290 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
291 strncpy(attr->u.ftrace.symbol_name,
dbbb3ec5
DG
292 ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
293 attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 294 break;
e6ddca71
DG
295 case LTTNG_EVENT_TRACEPOINT:
296 attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
f3ed775e 297 break;
a54bd42d
MD
298 case LTTNG_EVENT_SYSCALL:
299 attr->instrumentation = LTTNG_KERNEL_SYSCALL;
0133c199 300 break;
7a3d1328
MD
301 case LTTNG_EVENT_ALL:
302 attr->instrumentation = LTTNG_KERNEL_ALL;
303 break;
f3ed775e
DG
304 default:
305 ERR("Unknown kernel instrumentation type (%d)", ev->type);
306 goto error;
307 }
308
309 /* Copy event name */
dbbb3ec5
DG
310 strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN);
311 attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 312
54012638 313 /* Setting up a kernel event */
03550b58 314 lke->fd = -1;
54012638 315 lke->event = attr;
d36b8583 316 lke->enabled = 1;
00a62084
MD
317 lke->filter_expression = filter_expression;
318 lke->filter = filter;
54012638
DG
319
320 return lke;
321
322error:
a969e101
MD
323 free(filter_expression);
324 free(filter);
a2c0da86
MD
325 free(lke);
326 free(attr);
54012638
DG
327 return NULL;
328}
329
330/*
050349bb 331 * Allocate and initialize a kernel metadata.
54012638 332 *
050349bb 333 * Return pointer to structure or NULL.
54012638 334 */
a4b92340 335struct ltt_kernel_metadata *trace_kernel_create_metadata(void)
54012638 336{
54012638 337 struct ltt_kernel_metadata *lkm;
f3ed775e 338 struct lttng_channel *chan;
54012638 339
ba7f0ae5
DG
340 lkm = zmalloc(sizeof(struct ltt_kernel_metadata));
341 chan = zmalloc(sizeof(struct lttng_channel));
f3ed775e 342 if (lkm == NULL || chan == NULL) {
df0f840b 343 PERROR("kernel metadata zmalloc");
54012638
DG
344 goto error;
345 }
346
347 /* Set default attributes */
f3ed775e 348 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
3e230f92 349 chan->attr.subbuf_size = default_get_metadata_subbuf_size();
b389abbe 350 chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
6bb9e85f
MD
351 chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
352 chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
7d452e12 353 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
54012638
DG
354
355 /* Init metadata */
03550b58 356 lkm->fd = -1;
f3ed775e 357 lkm->conf = chan;
54012638
DG
358
359 return lkm;
360
361error:
a2c0da86
MD
362 free(lkm);
363 free(chan);
54012638
DG
364 return NULL;
365}
366
367/*
050349bb
DG
368 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
369 * default.
54012638 370 *
050349bb 371 * Return pointer to structure or NULL.
54012638 372 */
00e2e675
DG
373struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
374 unsigned int count)
54012638 375{
00e2e675 376 int ret;
54012638
DG
377 struct ltt_kernel_stream *lks;
378
0525e9ae
DG
379 assert(name);
380
ba7f0ae5 381 lks = zmalloc(sizeof(struct ltt_kernel_stream));
54012638 382 if (lks == NULL) {
df0f840b 383 PERROR("kernel stream zmalloc");
54012638
DG
384 goto error;
385 }
386
00e2e675 387 /* Set name */
535b8ff4 388 ret = snprintf(lks->name, sizeof(lks->name), "%s_%u", name, count);
00e2e675
DG
389 if (ret < 0) {
390 PERROR("snprintf stream name");
391 goto error;
392 }
393 lks->name[sizeof(lks->name) - 1] = '\0';
394
54012638 395 /* Init stream */
03550b58 396 lks->fd = -1;
54012638 397 lks->state = 0;
ffe60014 398 lks->cpu = count;
54012638
DG
399
400 return lks;
401
402error:
403 return NULL;
404}
c363b55d 405
050349bb
DG
406/*
407 * Cleanup kernel stream structure.
408 */
62499ad6 409void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
c363b55d 410{
0525e9ae
DG
411 assert(stream);
412
33a2b854 413 DBG("[trace] Closing stream fd %d", stream->fd);
c363b55d 414 /* Close kernel fd */
03550b58 415 if (stream->fd >= 0) {
c617c0c6
MD
416 int ret;
417
03550b58
MD
418 ret = close(stream->fd);
419 if (ret) {
420 PERROR("close");
421 }
799e2c4f 422 }
c363b55d
DG
423 /* Remove from stream list */
424 cds_list_del(&stream->list);
f9815039 425
c363b55d
DG
426 free(stream);
427}
428
050349bb
DG
429/*
430 * Cleanup kernel event structure.
431 */
62499ad6 432void trace_kernel_destroy_event(struct ltt_kernel_event *event)
c363b55d 433{
0525e9ae
DG
434 assert(event);
435
87eb4ab8 436 if (event->fd >= 0) {
c617c0c6
MD
437 int ret;
438
87eb4ab8
MD
439 DBG("[trace] Closing event fd %d", event->fd);
440 /* Close kernel fd */
799e2c4f
MD
441 ret = close(event->fd);
442 if (ret) {
443 PERROR("close");
444 }
87eb4ab8
MD
445 } else {
446 DBG("[trace] Tearing down event (no associated fd)");
447 }
c363b55d
DG
448
449 /* Remove from event list */
450 cds_list_del(&event->list);
f9815039 451
00a62084
MD
452 free(event->filter_expression);
453 free(event->filter);
454
f9815039 455 free(event->event);
c363b55d
DG
456 free(event);
457}
458
645328ae
DG
459/*
460 * Cleanup kernel context structure.
461 */
462void trace_kernel_destroy_context(struct ltt_kernel_context *ctx)
463{
464 assert(ctx);
465
466 cds_list_del(&ctx->list);
467 free(ctx);
468}
469
050349bb
DG
470/*
471 * Cleanup kernel channel structure.
472 */
62499ad6 473void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
c363b55d 474{
af9737e9
DG
475 struct ltt_kernel_stream *stream, *stmp;
476 struct ltt_kernel_event *event, *etmp;
645328ae 477 struct ltt_kernel_context *ctx, *ctmp;
799e2c4f 478 int ret;
c363b55d 479
0525e9ae
DG
480 assert(channel);
481
33a2b854 482 DBG("[trace] Closing channel fd %d", channel->fd);
c363b55d 483 /* Close kernel fd */
03550b58
MD
484 if (channel->fd >= 0) {
485 ret = close(channel->fd);
486 if (ret) {
487 PERROR("close");
488 }
799e2c4f 489 }
c363b55d
DG
490
491 /* For each stream in the channel list */
af9737e9 492 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
62499ad6 493 trace_kernel_destroy_stream(stream);
c363b55d
DG
494 }
495
496 /* For each event in the channel list */
af9737e9 497 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
62499ad6 498 trace_kernel_destroy_event(event);
c363b55d
DG
499 }
500
645328ae
DG
501 /* For each context in the channel list */
502 cds_list_for_each_entry_safe(ctx, ctmp, &channel->ctx_list, list) {
503 trace_kernel_destroy_context(ctx);
504 }
505
c363b55d
DG
506 /* Remove from channel list */
507 cds_list_del(&channel->list);
f9815039 508
f9815039 509 free(channel->channel);
c363b55d
DG
510 free(channel);
511}
512
050349bb
DG
513/*
514 * Cleanup kernel metadata structure.
515 */
62499ad6 516void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
c363b55d 517{
0525e9ae
DG
518 assert(metadata);
519
33a2b854 520 DBG("[trace] Closing metadata fd %d", metadata->fd);
c363b55d 521 /* Close kernel fd */
03550b58 522 if (metadata->fd >= 0) {
c617c0c6
MD
523 int ret;
524
03550b58
MD
525 ret = close(metadata->fd);
526 if (ret) {
527 PERROR("close");
528 }
799e2c4f 529 }
c363b55d 530
f9815039 531 free(metadata->conf);
c363b55d
DG
532 free(metadata);
533}
534
050349bb 535/*
62499ad6 536 * Cleanup kernel session structure
36b588ed
MD
537 *
538 * Should *NOT* be called with RCU read-side lock held.
050349bb 539 */
62499ad6 540void trace_kernel_destroy_session(struct ltt_kernel_session *session)
c363b55d 541{
af9737e9 542 struct ltt_kernel_channel *channel, *ctmp;
799e2c4f 543 int ret;
c363b55d 544
0525e9ae
DG
545 assert(session);
546
33a2b854 547 DBG("[trace] Closing session fd %d", session->fd);
c363b55d 548 /* Close kernel fds */
03550b58
MD
549 if (session->fd >= 0) {
550 ret = close(session->fd);
551 if (ret) {
552 PERROR("close");
553 }
799e2c4f 554 }
f9815039 555
03550b58 556 if (session->metadata_stream_fd >= 0) {
70dc1c34 557 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
799e2c4f
MD
558 ret = close(session->metadata_stream_fd);
559 if (ret) {
560 PERROR("close");
561 }
70dc1c34 562 }
c363b55d 563
d36b8583 564 if (session->metadata != NULL) {
62499ad6 565 trace_kernel_destroy_metadata(session->metadata);
d36b8583 566 }
c363b55d 567
af9737e9 568 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
62499ad6 569 trace_kernel_destroy_channel(channel);
c363b55d
DG
570 }
571
00e2e675 572 /* Wipe consumer output object */
6addfa37 573 consumer_output_put(session->consumer);
00e2e675 574
c363b55d
DG
575 free(session);
576}
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