Initial import of the new binary lttng-relayd
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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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
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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 *
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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
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
c363b55d 22#include <unistd.h>
54012638 23
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24#include <common/common.h>
25#include <common/defaults.h>
1e307fab 26
62499ad6 27#include "trace-kernel.h"
54012638 28
19e70852 29/*
050349bb 30 * Find the channel name for the given kernel session.
19e70852 31 */
62499ad6 32struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
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33 char *name, struct ltt_kernel_session *session)
34{
35 struct ltt_kernel_channel *chan;
36
37 if (session == NULL) {
38 ERR("Undefine session");
39 goto error;
40 }
41
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42 DBG("Trying to find channel %s", name);
43
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44 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
45 if (strcmp(name, chan->channel->name) == 0) {
46 DBG("Found channel by name %s", name);
47 return chan;
48 }
49 }
50
51error:
52 return NULL;
53}
54
55/*
050349bb 56 * Find the event name for the given channel.
19e70852 57 */
62499ad6 58struct ltt_kernel_event *trace_kernel_get_event_by_name(
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59 char *name, struct ltt_kernel_channel *channel)
60{
61 struct ltt_kernel_event *ev;
62
63 if (channel == NULL) {
64 ERR("Undefine channel");
65 goto error;
66 }
67
68 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
69 if (strcmp(name, ev->event->name) == 0) {
70 DBG("Found event by name %s for channel %s", name,
71 channel->channel->name);
72 return ev;
73 }
74 }
75
76error:
77 return NULL;
78}
79
54012638 80/*
050349bb 81 * Allocate and initialize a kernel session data structure.
54012638 82 *
050349bb 83 * Return pointer to structure or NULL.
54012638 84 */
f9815039 85struct ltt_kernel_session *trace_kernel_create_session(char *path)
54012638 86{
f9815039 87 int ret;
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88 struct ltt_kernel_session *lks;
89
90 /* Allocate a new ltt kernel session */
ba7f0ae5 91 lks = zmalloc(sizeof(struct ltt_kernel_session));
54012638 92 if (lks == NULL) {
df0f840b 93 PERROR("create kernel session zmalloc");
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94 goto error;
95 }
96
97 /* Init data structure */
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98 lks->fd = -1;
99 lks->metadata_stream_fd = -1;
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100 lks->channel_count = 0;
101 lks->stream_count_global = 0;
102 lks->metadata = NULL;
03550b58 103 lks->consumer_fd = -1;
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104 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
105
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106 /* Set session path */
107 ret = asprintf(&lks->trace_path, "%s/kernel", path);
108 if (ret < 0) {
df0f840b 109 PERROR("asprintf kernel traces path");
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110 goto error;
111 }
112
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113 return lks;
114
115error:
116 return NULL;
117}
118
119/*
050349bb 120 * Allocate and initialize a kernel channel data structure.
54012638 121 *
050349bb 122 * Return pointer to structure or NULL.
54012638 123 */
62499ad6 124struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path)
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125{
126 int ret;
127 struct ltt_kernel_channel *lkc;
54012638 128
ba7f0ae5 129 lkc = zmalloc(sizeof(struct ltt_kernel_channel));
f3ed775e 130 if (lkc == NULL) {
df0f840b 131 PERROR("ltt_kernel_channel zmalloc");
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132 goto error;
133 }
134
ba7f0ae5 135 lkc->channel = zmalloc(sizeof(struct lttng_channel));
f3ed775e 136 if (lkc->channel == NULL) {
df0f840b 137 PERROR("lttng_channel zmalloc");
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138 goto error;
139 }
140 memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
54012638 141
03550b58 142 lkc->fd = -1;
54012638 143 lkc->stream_count = 0;
cbbbb275 144 lkc->event_count = 0;
d36b8583 145 lkc->enabled = 1;
e75cda3a 146 lkc->ctx = NULL;
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147 /* Init linked list */
148 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
149 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
150 /* Set default trace output path */
b082db07 151 ret = asprintf(&lkc->pathname, "%s", path);
54012638 152 if (ret < 0) {
df0f840b 153 PERROR("asprintf kernel create channel");
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154 goto error;
155 }
156
157 return lkc;
158
159error:
160 return NULL;
161}
162
163/*
050349bb 164 * Allocate and initialize a kernel event. Set name and event type.
54012638 165 *
050349bb 166 * Return pointer to structure or NULL.
54012638 167 */
62499ad6 168struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev)
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169{
170 struct ltt_kernel_event *lke;
171 struct lttng_kernel_event *attr;
172
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173 lke = zmalloc(sizeof(struct ltt_kernel_event));
174 attr = zmalloc(sizeof(struct lttng_kernel_event));
54012638 175 if (lke == NULL || attr == NULL) {
df0f840b 176 PERROR("kernel event zmalloc");
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177 goto error;
178 }
179
f3ed775e 180 switch (ev->type) {
7d29a247 181 case LTTNG_EVENT_PROBE:
e6ddca71 182 attr->instrumentation = LTTNG_KERNEL_KPROBE;
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183 attr->u.kprobe.addr = ev->attr.probe.addr;
184 attr->u.kprobe.offset = ev->attr.probe.offset;
f3ed775e 185 strncpy(attr->u.kprobe.symbol_name,
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186 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
187 attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
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188 break;
189 case LTTNG_EVENT_FUNCTION:
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190 attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
191 attr->u.kretprobe.addr = ev->attr.probe.addr;
192 attr->u.kretprobe.offset = ev->attr.probe.offset;
193 attr->u.kretprobe.offset = ev->attr.probe.offset;
194 strncpy(attr->u.kretprobe.symbol_name,
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195 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
196 attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
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197 break;
198 case LTTNG_EVENT_FUNCTION_ENTRY:
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199 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
200 strncpy(attr->u.ftrace.symbol_name,
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201 ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
202 attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 203 break;
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204 case LTTNG_EVENT_TRACEPOINT:
205 attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
f3ed775e 206 break;
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207 case LTTNG_EVENT_SYSCALL:
208 attr->instrumentation = LTTNG_KERNEL_SYSCALL;
0133c199 209 break;
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210 case LTTNG_EVENT_ALL:
211 attr->instrumentation = LTTNG_KERNEL_ALL;
212 break;
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213 default:
214 ERR("Unknown kernel instrumentation type (%d)", ev->type);
215 goto error;
216 }
217
218 /* Copy event name */
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219 strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN);
220 attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 221
54012638 222 /* Setting up a kernel event */
03550b58 223 lke->fd = -1;
54012638 224 lke->event = attr;
d36b8583 225 lke->enabled = 1;
e75cda3a 226 lke->ctx = NULL;
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227
228 return lke;
229
230error:
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231 free(lke);
232 free(attr);
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233 return NULL;
234}
235
236/*
050349bb 237 * Allocate and initialize a kernel metadata.
54012638 238 *
050349bb 239 * Return pointer to structure or NULL.
54012638 240 */
62499ad6 241struct ltt_kernel_metadata *trace_kernel_create_metadata(char *path)
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242{
243 int ret;
244 struct ltt_kernel_metadata *lkm;
f3ed775e 245 struct lttng_channel *chan;
54012638 246
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247 lkm = zmalloc(sizeof(struct ltt_kernel_metadata));
248 chan = zmalloc(sizeof(struct lttng_channel));
f3ed775e 249 if (lkm == NULL || chan == NULL) {
df0f840b 250 PERROR("kernel metadata zmalloc");
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251 goto error;
252 }
253
254 /* Set default attributes */
f3ed775e 255 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
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256 chan->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
257 chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
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258 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
259 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
7d452e12 260 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
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261
262 /* Init metadata */
03550b58 263 lkm->fd = -1;
f3ed775e 264 lkm->conf = chan;
54012638 265 /* Set default metadata path */
58a97671 266 ret = asprintf(&lkm->pathname, "%s/metadata", path);
54012638 267 if (ret < 0) {
df0f840b 268 PERROR("asprintf kernel metadata");
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269 goto error;
270 }
271
272 return lkm;
273
274error:
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275 free(lkm);
276 free(chan);
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277 return NULL;
278}
279
280/*
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281 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
282 * default.
54012638 283 *
050349bb 284 * Return pointer to structure or NULL.
54012638 285 */
62499ad6 286struct ltt_kernel_stream *trace_kernel_create_stream(void)
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287{
288 struct ltt_kernel_stream *lks;
289
ba7f0ae5 290 lks = zmalloc(sizeof(struct ltt_kernel_stream));
54012638 291 if (lks == NULL) {
df0f840b 292 PERROR("kernel stream zmalloc");
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293 goto error;
294 }
295
296 /* Init stream */
03550b58 297 lks->fd = -1;
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298 lks->pathname = NULL;
299 lks->state = 0;
300
301 return lks;
302
303error:
304 return NULL;
305}
c363b55d 306
050349bb
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307/*
308 * Cleanup kernel stream structure.
309 */
62499ad6 310void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
c363b55d 311{
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312 int ret;
313
33a2b854 314 DBG("[trace] Closing stream fd %d", stream->fd);
c363b55d 315 /* Close kernel fd */
03550b58
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316 if (stream->fd >= 0) {
317 ret = close(stream->fd);
318 if (ret) {
319 PERROR("close");
320 }
799e2c4f 321 }
c363b55d
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322 /* Remove from stream list */
323 cds_list_del(&stream->list);
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324
325 free(stream->pathname);
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326 free(stream);
327}
328
050349bb
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329/*
330 * Cleanup kernel event structure.
331 */
62499ad6 332void trace_kernel_destroy_event(struct ltt_kernel_event *event)
c363b55d 333{
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334 int ret;
335
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336 if (event->fd >= 0) {
337 DBG("[trace] Closing event fd %d", event->fd);
338 /* Close kernel fd */
799e2c4f
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339 ret = close(event->fd);
340 if (ret) {
341 PERROR("close");
342 }
87eb4ab8
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343 } else {
344 DBG("[trace] Tearing down event (no associated fd)");
345 }
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346
347 /* Remove from event list */
348 cds_list_del(&event->list);
f9815039
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349
350 free(event->event);
351 free(event->ctx);
c363b55d
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352 free(event);
353}
354
050349bb
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355/*
356 * Cleanup kernel channel structure.
357 */
62499ad6 358void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
c363b55d 359{
af9737e9
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360 struct ltt_kernel_stream *stream, *stmp;
361 struct ltt_kernel_event *event, *etmp;
799e2c4f 362 int ret;
c363b55d 363
33a2b854 364 DBG("[trace] Closing channel fd %d", channel->fd);
c363b55d 365 /* Close kernel fd */
03550b58
MD
366 if (channel->fd >= 0) {
367 ret = close(channel->fd);
368 if (ret) {
369 PERROR("close");
370 }
799e2c4f 371 }
c363b55d
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372
373 /* For each stream in the channel list */
af9737e9 374 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
62499ad6 375 trace_kernel_destroy_stream(stream);
c363b55d
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376 }
377
378 /* For each event in the channel list */
af9737e9 379 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
62499ad6 380 trace_kernel_destroy_event(event);
c363b55d
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381 }
382
383 /* Remove from channel list */
384 cds_list_del(&channel->list);
f9815039
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385
386 free(channel->pathname);
387 free(channel->channel);
388 free(channel->ctx);
c363b55d
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389 free(channel);
390}
391
050349bb
DG
392/*
393 * Cleanup kernel metadata structure.
394 */
62499ad6 395void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
c363b55d 396{
799e2c4f
MD
397 int ret;
398
33a2b854 399 DBG("[trace] Closing metadata fd %d", metadata->fd);
c363b55d 400 /* Close kernel fd */
03550b58
MD
401 if (metadata->fd >= 0) {
402 ret = close(metadata->fd);
403 if (ret) {
404 PERROR("close");
405 }
799e2c4f 406 }
c363b55d 407
f9815039
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408 free(metadata->conf);
409 free(metadata->pathname);
c363b55d
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410 free(metadata);
411}
412
050349bb 413/*
62499ad6 414 * Cleanup kernel session structure
050349bb 415 */
62499ad6 416void trace_kernel_destroy_session(struct ltt_kernel_session *session)
c363b55d 417{
af9737e9 418 struct ltt_kernel_channel *channel, *ctmp;
799e2c4f 419 int ret;
c363b55d 420
33a2b854 421 DBG("[trace] Closing session fd %d", session->fd);
c363b55d 422 /* Close kernel fds */
03550b58
MD
423 if (session->fd >= 0) {
424 ret = close(session->fd);
425 if (ret) {
426 PERROR("close");
427 }
799e2c4f 428 }
f9815039 429
03550b58 430 if (session->metadata_stream_fd >= 0) {
70dc1c34 431 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
799e2c4f
MD
432 ret = close(session->metadata_stream_fd);
433 if (ret) {
434 PERROR("close");
435 }
70dc1c34 436 }
c363b55d 437
d36b8583 438 if (session->metadata != NULL) {
62499ad6 439 trace_kernel_destroy_metadata(session->metadata);
d36b8583 440 }
c363b55d 441
af9737e9 442 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
62499ad6 443 trace_kernel_destroy_channel(channel);
c363b55d
DG
444 }
445
f9815039 446 free(session->trace_path);
c363b55d
DG
447 free(session);
448}
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