Commit | Line | Data |
---|---|---|
20fe2104 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. | |
20fe2104 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. | |
20fe2104 DG |
16 | */ |
17 | ||
8c0faa1d | 18 | #define _GNU_SOURCE |
20fe2104 | 19 | #include <errno.h> |
7b395890 | 20 | #include <fcntl.h> |
20fe2104 DG |
21 | #include <stdlib.h> |
22 | #include <stdio.h> | |
f34daff7 | 23 | #include <string.h> |
8c0faa1d | 24 | #include <unistd.h> |
77c7c900 | 25 | #include <inttypes.h> |
20fe2104 | 26 | |
990570ed | 27 | #include <common/common.h> |
db758600 | 28 | #include <common/kernel-ctl/kernel-ctl.h> |
42224349 | 29 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 30 | |
2f77fc4b | 31 | #include "consumer.h" |
4771f025 | 32 | #include "kernel.h" |
6dc3064a | 33 | #include "kernel-consumer.h" |
096102bd | 34 | #include "kern-modules.h" |
20fe2104 | 35 | |
d65106b1 | 36 | /* |
050349bb | 37 | * Add context on a kernel channel. |
d65106b1 DG |
38 | */ |
39 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 40 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
41 | { |
42 | int ret; | |
43 | ||
0525e9ae DG |
44 | assert(chan); |
45 | assert(ctx); | |
46 | ||
d65106b1 | 47 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 48 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 49 | if (ret < 0) { |
b579acd9 | 50 | if (errno != EEXIST) { |
df0f840b | 51 | PERROR("add context ioctl"); |
b579acd9 DG |
52 | } else { |
53 | /* If EEXIST, we just ignore the error */ | |
54 | ret = 0; | |
55 | } | |
d65106b1 DG |
56 | goto error; |
57 | } | |
58 | ||
645328ae | 59 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
d65106b1 DG |
60 | |
61 | return 0; | |
62 | ||
63 | error: | |
64 | return ret; | |
65 | } | |
66 | ||
20fe2104 | 67 | /* |
050349bb DG |
68 | * Create a new kernel session, register it to the kernel tracer and add it to |
69 | * the session daemon session. | |
20fe2104 | 70 | */ |
8c0faa1d | 71 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
72 | { |
73 | int ret; | |
74 | struct ltt_kernel_session *lks; | |
75 | ||
0525e9ae DG |
76 | assert(session); |
77 | ||
54012638 | 78 | /* Allocate data structure */ |
dec56f6c | 79 | lks = trace_kernel_create_session(); |
20fe2104 | 80 | if (lks == NULL) { |
54012638 | 81 | ret = -1; |
20fe2104 DG |
82 | goto error; |
83 | } | |
84 | ||
54012638 | 85 | /* Kernel tracer session creation */ |
20fe2104 DG |
86 | ret = kernctl_create_session(tracer_fd); |
87 | if (ret < 0) { | |
df0f840b | 88 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
89 | goto error; |
90 | } | |
91 | ||
20fe2104 | 92 | lks->fd = ret; |
7b395890 DG |
93 | /* Prevent fd duplication after execlp() */ |
94 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
95 | if (ret < 0) { | |
df0f840b | 96 | PERROR("fcntl session fd"); |
7b395890 DG |
97 | } |
98 | ||
53632229 | 99 | lks->id = session->id; |
3bd1e081 | 100 | lks->consumer_fds_sent = 0; |
8c0faa1d | 101 | session->kernel_session = lks; |
8c0faa1d DG |
102 | |
103 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
104 | |
105 | return 0; | |
106 | ||
107 | error: | |
5f62c685 DG |
108 | if (lks) { |
109 | trace_kernel_destroy_session(lks); | |
110 | } | |
20fe2104 DG |
111 | return ret; |
112 | } | |
113 | ||
114 | /* | |
050349bb DG |
115 | * Create a kernel channel, register it to the kernel tracer and add it to the |
116 | * kernel session. | |
20fe2104 | 117 | */ |
050349bb | 118 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 119 | struct lttng_channel *chan) |
20fe2104 DG |
120 | { |
121 | int ret; | |
122 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 123 | |
0525e9ae DG |
124 | assert(session); |
125 | assert(chan); | |
0525e9ae | 126 | |
54012638 | 127 | /* Allocate kernel channel */ |
fdd9eb17 | 128 | lkc = trace_kernel_create_channel(chan); |
54012638 | 129 | if (lkc == NULL) { |
20fe2104 DG |
130 | goto error; |
131 | } | |
132 | ||
ecc48a90 | 133 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 134 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
135 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
136 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 137 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 138 | |
54012638 | 139 | /* Kernel tracer channel creation */ |
f3ed775e | 140 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 141 | if (ret < 0) { |
df0f840b | 142 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
143 | goto error; |
144 | } | |
145 | ||
54012638 | 146 | /* Setup the channel fd */ |
20fe2104 | 147 | lkc->fd = ret; |
7b395890 DG |
148 | /* Prevent fd duplication after execlp() */ |
149 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
150 | if (ret < 0) { | |
df0f840b | 151 | PERROR("fcntl session fd"); |
7b395890 DG |
152 | } |
153 | ||
54012638 | 154 | /* Add channel to session */ |
8c0faa1d DG |
155 | cds_list_add(&lkc->list, &session->channel_list.head); |
156 | session->channel_count++; | |
fb5f35b6 | 157 | lkc->session = session; |
20fe2104 | 158 | |
00e2e675 | 159 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
160 | |
161 | return 0; | |
162 | ||
163 | error: | |
5f62c685 DG |
164 | if (lkc) { |
165 | free(lkc->channel); | |
166 | free(lkc); | |
167 | } | |
54012638 | 168 | return -1; |
20fe2104 | 169 | } |
f34daff7 DG |
170 | |
171 | /* | |
050349bb DG |
172 | * Create a kernel event, enable it to the kernel tracer and add it to the |
173 | * channel event list of the kernel session. | |
f34daff7 | 174 | */ |
050349bb DG |
175 | int kernel_create_event(struct lttng_event *ev, |
176 | struct ltt_kernel_channel *channel) | |
f34daff7 DG |
177 | { |
178 | int ret; | |
179 | struct ltt_kernel_event *event; | |
f34daff7 | 180 | |
0525e9ae DG |
181 | assert(ev); |
182 | assert(channel); | |
183 | ||
62499ad6 | 184 | event = trace_kernel_create_event(ev); |
54012638 | 185 | if (event == NULL) { |
d87bfb32 | 186 | ret = -1; |
f34daff7 DG |
187 | goto error; |
188 | } | |
189 | ||
f3ed775e DG |
190 | ret = kernctl_create_event(channel->fd, event->event); |
191 | if (ret < 0) { | |
bd29c13d DG |
192 | switch (errno) { |
193 | case EEXIST: | |
194 | break; | |
195 | case ENOSYS: | |
196 | WARN("Event type not implemented"); | |
197 | break; | |
8197a339 DG |
198 | case ENOENT: |
199 | WARN("Event %s not found!", ev->name); | |
200 | break; | |
bd29c13d | 201 | default: |
d87bfb32 DG |
202 | PERROR("create event ioctl"); |
203 | } | |
204 | ret = -errno; | |
e953ef25 | 205 | goto free_event; |
8c0faa1d | 206 | } |
f34daff7 | 207 | |
5f822d0a | 208 | /* |
2c425ff7 | 209 | * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. |
5f822d0a DG |
210 | */ |
211 | if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
212 | DBG2("Kernel event syscall creation success"); | |
87eb4ab8 MD |
213 | /* |
214 | * We use fd == -1 to ensure that we never trigger a close of fd | |
215 | * 0. | |
216 | */ | |
217 | event->fd = -1; | |
2c425ff7 | 218 | goto add_list; |
5f822d0a DG |
219 | } |
220 | ||
f3ed775e | 221 | event->fd = ret; |
7b395890 DG |
222 | /* Prevent fd duplication after execlp() */ |
223 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
224 | if (ret < 0) { | |
df0f840b | 225 | PERROR("fcntl session fd"); |
7b395890 DG |
226 | } |
227 | ||
2c425ff7 | 228 | add_list: |
f3ed775e DG |
229 | /* Add event to event list */ |
230 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
231 | channel->event_count++; |
232 | ||
e953ef25 DG |
233 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
234 | ||
235 | return 0; | |
236 | ||
237 | free_event: | |
238 | free(event); | |
239 | error: | |
d87bfb32 | 240 | return ret; |
e953ef25 DG |
241 | } |
242 | ||
26cc6b4e | 243 | /* |
050349bb | 244 | * Disable a kernel channel. |
26cc6b4e DG |
245 | */ |
246 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
247 | { | |
248 | int ret; | |
249 | ||
0525e9ae DG |
250 | assert(chan); |
251 | ||
26cc6b4e DG |
252 | ret = kernctl_disable(chan->fd); |
253 | if (ret < 0) { | |
df0f840b | 254 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
255 | ret = errno; |
256 | goto error; | |
257 | } | |
258 | ||
259 | chan->enabled = 0; | |
260 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
261 | ||
262 | return 0; | |
263 | ||
264 | error: | |
265 | return ret; | |
266 | } | |
267 | ||
d36b8583 | 268 | /* |
050349bb | 269 | * Enable a kernel channel. |
d36b8583 DG |
270 | */ |
271 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
272 | { | |
273 | int ret; | |
274 | ||
0525e9ae DG |
275 | assert(chan); |
276 | ||
d36b8583 | 277 | ret = kernctl_enable(chan->fd); |
54d01ffb | 278 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 279 | PERROR("Enable kernel chan"); |
d36b8583 DG |
280 | goto error; |
281 | } | |
282 | ||
283 | chan->enabled = 1; | |
284 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
285 | ||
286 | return 0; | |
287 | ||
288 | error: | |
289 | return ret; | |
290 | } | |
291 | ||
19e70852 | 292 | /* |
050349bb | 293 | * Enable a kernel event. |
19e70852 DG |
294 | */ |
295 | int kernel_enable_event(struct ltt_kernel_event *event) | |
296 | { | |
297 | int ret; | |
298 | ||
0525e9ae DG |
299 | assert(event); |
300 | ||
19e70852 | 301 | ret = kernctl_enable(event->fd); |
42224349 DG |
302 | if (ret < 0) { |
303 | switch (errno) { | |
304 | case EEXIST: | |
f73fabfd | 305 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
306 | break; |
307 | default: | |
308 | PERROR("enable kernel event"); | |
309 | break; | |
310 | } | |
19e70852 DG |
311 | goto error; |
312 | } | |
313 | ||
314 | event->enabled = 1; | |
315 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
316 | ||
317 | return 0; | |
318 | ||
319 | error: | |
d36b8583 | 320 | return ret; |
19e70852 DG |
321 | } |
322 | ||
e953ef25 | 323 | /* |
050349bb | 324 | * Disable a kernel event. |
e953ef25 | 325 | */ |
19e70852 | 326 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
327 | { |
328 | int ret; | |
19e70852 | 329 | |
0525e9ae DG |
330 | assert(event); |
331 | ||
19e70852 | 332 | ret = kernctl_disable(event->fd); |
42224349 DG |
333 | if (ret < 0) { |
334 | switch (errno) { | |
335 | case EEXIST: | |
f73fabfd | 336 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
337 | break; |
338 | default: | |
339 | PERROR("disable kernel event"); | |
340 | break; | |
341 | } | |
19e70852 | 342 | goto error; |
e953ef25 | 343 | } |
f3ed775e | 344 | |
19e70852 DG |
345 | event->enabled = 0; |
346 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
347 | ||
f34daff7 DG |
348 | return 0; |
349 | ||
350 | error: | |
d36b8583 | 351 | return ret; |
f34daff7 | 352 | } |
aaf26714 | 353 | |
6e911cad MD |
354 | int kernel_enable_syscall(const char *syscall_name, |
355 | struct ltt_kernel_channel *channel) | |
356 | { | |
357 | return kernctl_enable_syscall(channel->fd, syscall_name); | |
358 | } | |
359 | ||
360 | int kernel_disable_syscall(const char *syscall_name, | |
361 | struct ltt_kernel_channel *channel) | |
362 | { | |
363 | return kernctl_disable_syscall(channel->fd, syscall_name); | |
364 | } | |
365 | ||
aaf26714 | 366 | /* |
050349bb DG |
367 | * Create kernel metadata, open from the kernel tracer and add it to the |
368 | * kernel session. | |
aaf26714 | 369 | */ |
a4b92340 | 370 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
371 | { |
372 | int ret; | |
74024a21 | 373 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 374 | |
0525e9ae DG |
375 | assert(session); |
376 | ||
54012638 | 377 | /* Allocate kernel metadata */ |
a4b92340 | 378 | lkm = trace_kernel_create_metadata(); |
54012638 | 379 | if (lkm == NULL) { |
aaf26714 DG |
380 | goto error; |
381 | } | |
382 | ||
54012638 | 383 | /* Kernel tracer metadata creation */ |
f3ed775e | 384 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 385 | if (ret < 0) { |
74024a21 | 386 | goto error_open; |
aaf26714 DG |
387 | } |
388 | ||
8c0faa1d | 389 | lkm->fd = ret; |
7b395890 DG |
390 | /* Prevent fd duplication after execlp() */ |
391 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
392 | if (ret < 0) { | |
df0f840b | 393 | PERROR("fcntl session fd"); |
7b395890 DG |
394 | } |
395 | ||
aaf26714 | 396 | session->metadata = lkm; |
8c0faa1d | 397 | |
00e2e675 | 398 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
399 | |
400 | return 0; | |
401 | ||
74024a21 DG |
402 | error_open: |
403 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 404 | error: |
54012638 | 405 | return -1; |
8c0faa1d DG |
406 | } |
407 | ||
408 | /* | |
050349bb | 409 | * Start tracing session. |
8c0faa1d DG |
410 | */ |
411 | int kernel_start_session(struct ltt_kernel_session *session) | |
412 | { | |
413 | int ret; | |
414 | ||
0525e9ae DG |
415 | assert(session); |
416 | ||
8c0faa1d DG |
417 | ret = kernctl_start_session(session->fd); |
418 | if (ret < 0) { | |
df0f840b | 419 | PERROR("ioctl start session"); |
8c0faa1d DG |
420 | goto error; |
421 | } | |
422 | ||
423 | DBG("Kernel session started"); | |
424 | ||
425 | return 0; | |
426 | ||
427 | error: | |
428 | return ret; | |
429 | } | |
430 | ||
f3ed775e | 431 | /* |
050349bb | 432 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
433 | */ |
434 | void kernel_wait_quiescent(int fd) | |
435 | { | |
436 | int ret; | |
437 | ||
438 | DBG("Kernel quiescent wait on %d", fd); | |
439 | ||
440 | ret = kernctl_wait_quiescent(fd); | |
441 | if (ret < 0) { | |
df0f840b | 442 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
443 | ERR("Kernel quiescent wait failed"); |
444 | } | |
445 | } | |
446 | ||
d0254c7c | 447 | /* |
050349bb | 448 | * Kernel calibrate |
d0254c7c MD |
449 | */ |
450 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
451 | { | |
452 | int ret; | |
453 | ||
0525e9ae DG |
454 | assert(calibrate); |
455 | ||
d0254c7c MD |
456 | ret = kernctl_calibrate(fd, calibrate); |
457 | if (ret < 0) { | |
df0f840b | 458 | PERROR("calibrate ioctl"); |
d0254c7c MD |
459 | return -1; |
460 | } | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | ||
f3ed775e | 466 | /* |
f3ed775e DG |
467 | * Force flush buffer of metadata. |
468 | */ | |
469 | int kernel_metadata_flush_buffer(int fd) | |
470 | { | |
471 | int ret; | |
472 | ||
169d2cb7 DG |
473 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
474 | ||
f3ed775e DG |
475 | ret = kernctl_buffer_flush(fd); |
476 | if (ret < 0) { | |
00e2e675 | 477 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
478 | } |
479 | ||
480 | return 0; | |
481 | } | |
482 | ||
483 | /* | |
050349bb | 484 | * Force flush buffer for channel. |
f3ed775e DG |
485 | */ |
486 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
487 | { | |
488 | int ret; | |
489 | struct ltt_kernel_stream *stream; | |
490 | ||
0525e9ae DG |
491 | assert(channel); |
492 | ||
f3ed775e DG |
493 | DBG("Flush buffer for channel %s", channel->channel->name); |
494 | ||
495 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
496 | DBG("Flushing channel stream %d", stream->fd); | |
497 | ret = kernctl_buffer_flush(stream->fd); | |
498 | if (ret < 0) { | |
df0f840b | 499 | PERROR("ioctl"); |
f3ed775e DG |
500 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
501 | stream->fd, ret); | |
502 | } | |
503 | } | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
8c0faa1d | 508 | /* |
050349bb | 509 | * Stop tracing session. |
8c0faa1d DG |
510 | */ |
511 | int kernel_stop_session(struct ltt_kernel_session *session) | |
512 | { | |
513 | int ret; | |
514 | ||
0525e9ae DG |
515 | assert(session); |
516 | ||
8c0faa1d DG |
517 | ret = kernctl_stop_session(session->fd); |
518 | if (ret < 0) { | |
519 | goto error; | |
520 | } | |
521 | ||
522 | DBG("Kernel session stopped"); | |
523 | ||
524 | return 0; | |
525 | ||
526 | error: | |
527 | return ret; | |
528 | } | |
529 | ||
530 | /* | |
050349bb DG |
531 | * Open stream of channel, register it to the kernel tracer and add it |
532 | * to the stream list of the channel. | |
8c0faa1d | 533 | * |
050349bb | 534 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 535 | */ |
f3ed775e | 536 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 537 | { |
00e2e675 | 538 | int ret, count = 0; |
8c0faa1d DG |
539 | struct ltt_kernel_stream *lks; |
540 | ||
0525e9ae DG |
541 | assert(channel); |
542 | ||
5a47c6a2 | 543 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
00e2e675 | 544 | lks = trace_kernel_create_stream(channel->channel->name, count); |
8c0faa1d | 545 | if (lks == NULL) { |
799e2c4f MD |
546 | ret = close(ret); |
547 | if (ret) { | |
548 | PERROR("close"); | |
549 | } | |
8c0faa1d DG |
550 | goto error; |
551 | } | |
552 | ||
553 | lks->fd = ret; | |
7b395890 DG |
554 | /* Prevent fd duplication after execlp() */ |
555 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
556 | if (ret < 0) { | |
df0f840b | 557 | PERROR("fcntl session fd"); |
7b395890 DG |
558 | } |
559 | ||
1624d5b7 JD |
560 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
561 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
562 | ||
54012638 | 563 | /* Add stream to channe stream list */ |
8c0faa1d DG |
564 | cds_list_add(&lks->list, &channel->stream_list.head); |
565 | channel->stream_count++; | |
8c0faa1d | 566 | |
00e2e675 DG |
567 | /* Increment counter which represent CPU number. */ |
568 | count++; | |
569 | ||
570 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, | |
571 | lks->state); | |
54012638 | 572 | } |
8c0faa1d DG |
573 | |
574 | return channel->stream_count; | |
575 | ||
576 | error: | |
54012638 | 577 | return -1; |
8c0faa1d DG |
578 | } |
579 | ||
580 | /* | |
050349bb | 581 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 582 | */ |
f3ed775e | 583 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
584 | { |
585 | int ret; | |
586 | ||
0525e9ae DG |
587 | assert(session); |
588 | ||
8c0faa1d DG |
589 | ret = kernctl_create_stream(session->metadata->fd); |
590 | if (ret < 0) { | |
df0f840b | 591 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
592 | goto error; |
593 | } | |
594 | ||
595 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
596 | session->metadata_stream_fd = ret; | |
7b395890 DG |
597 | /* Prevent fd duplication after execlp() */ |
598 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
599 | if (ret < 0) { | |
df0f840b | 600 | PERROR("fcntl session fd"); |
7b395890 | 601 | } |
aaf26714 DG |
602 | |
603 | return 0; | |
604 | ||
605 | error: | |
54012638 | 606 | return -1; |
aaf26714 | 607 | } |
2ef84c95 DG |
608 | |
609 | /* | |
9f19cc17 | 610 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 611 | */ |
9f19cc17 | 612 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 613 | { |
53efb85a | 614 | int fd, ret; |
9f19cc17 DG |
615 | char *event; |
616 | size_t nbmem, count = 0; | |
2ef84c95 | 617 | FILE *fp; |
9f19cc17 | 618 | struct lttng_event *elist; |
2ef84c95 | 619 | |
0525e9ae DG |
620 | assert(events); |
621 | ||
2ef84c95 DG |
622 | fd = kernctl_tracepoint_list(tracer_fd); |
623 | if (fd < 0) { | |
df0f840b | 624 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
625 | goto error; |
626 | } | |
627 | ||
628 | fp = fdopen(fd, "r"); | |
629 | if (fp == NULL) { | |
df0f840b | 630 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 631 | goto error_fp; |
2ef84c95 DG |
632 | } |
633 | ||
634 | /* | |
635 | * Init memory size counter | |
636 | * See kernel-ctl.h for explanation of this value | |
637 | */ | |
6725fe19 | 638 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 639 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
640 | if (elist == NULL) { |
641 | PERROR("alloc list events"); | |
642 | count = -ENOMEM; | |
643 | goto end; | |
644 | } | |
2ef84c95 | 645 | |
53efb85a | 646 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 647 | if (count >= nbmem) { |
3b870559 | 648 | struct lttng_event *new_elist; |
53efb85a | 649 | size_t new_nbmem; |
3b870559 | 650 | |
53efb85a MD |
651 | new_nbmem = nbmem << 1; |
652 | DBG("Reallocating event list from %zu to %zu bytes", | |
653 | nbmem, new_nbmem); | |
654 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 655 | if (new_elist == NULL) { |
df0f840b | 656 | PERROR("realloc list events"); |
3b870559 MD |
657 | free(event); |
658 | free(elist); | |
61b73b12 MD |
659 | count = -ENOMEM; |
660 | goto end; | |
2ef84c95 | 661 | } |
53efb85a MD |
662 | /* Zero the new memory */ |
663 | memset(new_elist + nbmem, 0, | |
664 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
665 | nbmem = new_nbmem; | |
3b870559 | 666 | elist = new_elist; |
2ef84c95 | 667 | } |
99497cd0 MD |
668 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
669 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 670 | elist[count].enabled = -1; |
9f19cc17 | 671 | count++; |
3b870559 | 672 | free(event); |
2ef84c95 DG |
673 | } |
674 | ||
9f19cc17 | 675 | *events = elist; |
ced2f820 | 676 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 677 | end: |
799e2c4f MD |
678 | ret = fclose(fp); /* closes both fp and fd */ |
679 | if (ret) { | |
680 | PERROR("fclose"); | |
681 | } | |
9f19cc17 | 682 | return count; |
2ef84c95 | 683 | |
61b73b12 | 684 | error_fp: |
799e2c4f MD |
685 | ret = close(fd); |
686 | if (ret) { | |
687 | PERROR("close"); | |
688 | } | |
2ef84c95 DG |
689 | error: |
690 | return -1; | |
691 | } | |
096102bd DG |
692 | |
693 | /* | |
694 | * Get kernel version and validate it. | |
695 | */ | |
696 | int kernel_validate_version(int tracer_fd) | |
697 | { | |
698 | int ret; | |
699 | struct lttng_kernel_tracer_version version; | |
700 | ||
701 | ret = kernctl_tracer_version(tracer_fd, &version); | |
702 | if (ret < 0) { | |
703 | ERR("Failed at getting the lttng-modules version"); | |
704 | goto error; | |
705 | } | |
706 | ||
707 | /* Validate version */ | |
a62a6556 MD |
708 | if (version.major != KERN_MODULES_PRE_MAJOR |
709 | && version.major != KERN_MODULES_MAJOR) { | |
096102bd | 710 | goto error_version; |
096102bd DG |
711 | } |
712 | ||
a62a6556 | 713 | DBG2("Kernel tracer version validated (major version %d)", version.major); |
096102bd DG |
714 | return 0; |
715 | ||
716 | error_version: | |
5df0f285 | 717 | ERR("Kernel major version %d is not compatible (supporting <= %d)", |
a62a6556 | 718 | version.major, KERN_MODULES_MAJOR) |
096102bd DG |
719 | ret = -1; |
720 | ||
721 | error: | |
722 | return ret; | |
723 | } | |
335a95b7 MD |
724 | |
725 | /* | |
726 | * Kernel work-arounds called at the start of sessiond main(). | |
727 | */ | |
728 | int init_kernel_workarounds(void) | |
729 | { | |
8936c33a | 730 | int ret; |
335a95b7 MD |
731 | FILE *fp; |
732 | ||
733 | /* | |
734 | * boot_id needs to be read once before being used concurrently | |
735 | * to deal with a Linux kernel race. A fix is proposed for | |
736 | * upstream, but the work-around is needed for older kernels. | |
737 | */ | |
738 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
739 | if (!fp) { | |
740 | goto end_boot_id; | |
741 | } | |
742 | while (!feof(fp)) { | |
743 | char buf[37] = ""; | |
744 | ||
8936c33a DG |
745 | ret = fread(buf, 1, sizeof(buf), fp); |
746 | if (ret < 0) { | |
747 | /* Ignore error, we don't really care */ | |
748 | } | |
335a95b7 | 749 | } |
799e2c4f MD |
750 | ret = fclose(fp); |
751 | if (ret) { | |
752 | PERROR("fclose"); | |
753 | } | |
335a95b7 | 754 | end_boot_id: |
335a95b7 MD |
755 | return 0; |
756 | } | |
2f77fc4b DG |
757 | |
758 | /* | |
759 | * Complete teardown of a kernel session. | |
760 | */ | |
761 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
762 | { | |
763 | if (ksess == NULL) { | |
764 | DBG3("No kernel session when tearing down session"); | |
765 | return; | |
766 | } | |
767 | ||
768 | DBG("Tearing down kernel session"); | |
769 | ||
07b86b52 | 770 | /* |
15dc512a DG |
771 | * Destroy channels on the consumer if at least one FD has been sent and we |
772 | * are in no output mode because the streams are in *no* monitor mode so we | |
773 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 774 | */ |
15dc512a | 775 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
776 | int ret; |
777 | struct consumer_socket *socket; | |
778 | struct lttng_ht_iter iter; | |
779 | ||
780 | /* For each consumer socket. */ | |
781 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
782 | socket, node.node) { | |
783 | struct ltt_kernel_channel *chan; | |
784 | ||
785 | /* For each channel, ask the consumer to destroy it. */ | |
786 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
787 | ret = kernel_consumer_destroy_channel(socket, chan); | |
788 | if (ret < 0) { | |
789 | /* Consumer is probably dead. Use next socket. */ | |
790 | continue; | |
791 | } | |
792 | } | |
793 | } | |
794 | } | |
795 | ||
2f77fc4b DG |
796 | /* Close any relayd session */ |
797 | consumer_output_send_destroy_relayd(ksess->consumer); | |
798 | ||
799 | trace_kernel_destroy_session(ksess); | |
800 | } | |
fb5f35b6 DG |
801 | |
802 | /* | |
803 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
804 | */ | |
805 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
806 | { | |
807 | struct ltt_kernel_session *ksess = NULL; | |
808 | ||
809 | assert(kchan); | |
810 | assert(kchan->channel); | |
811 | ||
812 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
813 | ||
814 | /* Update channel count of associated session. */ | |
815 | if (kchan->session) { | |
816 | /* Keep pointer reference so we can update it after the destroy. */ | |
817 | ksess = kchan->session; | |
818 | } | |
819 | ||
820 | trace_kernel_destroy_channel(kchan); | |
821 | ||
822 | /* | |
823 | * At this point the kernel channel is not visible anymore. This is safe | |
824 | * since in order to work on a visible kernel session, the tracing session | |
825 | * lock (ltt_session.lock) MUST be acquired. | |
826 | */ | |
827 | if (ksess) { | |
828 | ksess->channel_count--; | |
829 | } | |
830 | } | |
6dc3064a DG |
831 | |
832 | /* | |
833 | * Take a snapshot for a given kernel session. | |
834 | * | |
2a06df8d | 835 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
836 | */ |
837 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
68808f4e | 838 | struct snapshot_output *output, int wait, uint64_t max_size_per_stream) |
6dc3064a | 839 | { |
2a06df8d | 840 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
841 | struct consumer_socket *socket; |
842 | struct lttng_ht_iter iter; | |
843 | struct ltt_kernel_metadata *saved_metadata; | |
844 | ||
845 | assert(ksess); | |
846 | assert(ksess->consumer); | |
847 | assert(output); | |
848 | ||
849 | DBG("Kernel snapshot record started"); | |
850 | ||
851 | /* Save current metadata since the following calls will change it. */ | |
852 | saved_metadata = ksess->metadata; | |
853 | saved_metadata_fd = ksess->metadata_stream_fd; | |
854 | ||
855 | rcu_read_lock(); | |
856 | ||
857 | ret = kernel_open_metadata(ksess); | |
858 | if (ret < 0) { | |
859 | ret = LTTNG_ERR_KERN_META_FAIL; | |
860 | goto error; | |
861 | } | |
862 | ||
863 | ret = kernel_open_metadata_stream(ksess); | |
864 | if (ret < 0) { | |
865 | ret = LTTNG_ERR_KERN_META_FAIL; | |
866 | goto error_open_stream; | |
867 | } | |
868 | ||
869 | /* Send metadata to consumer and snapshot everything. */ | |
870 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
871 | socket, node.node) { | |
872 | struct consumer_output *saved_output; | |
873 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
874 | |
875 | /* | |
876 | * Temporarly switch consumer output for our snapshot output. As long | |
877 | * as the session lock is taken, this is safe. | |
878 | */ | |
879 | saved_output = ksess->consumer; | |
880 | ksess->consumer = output->consumer; | |
881 | ||
882 | pthread_mutex_lock(socket->lock); | |
883 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 884 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 885 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 886 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
887 | ksess->consumer = saved_output; |
888 | if (ret < 0) { | |
889 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
890 | goto error_consumer; | |
891 | } | |
892 | ||
893 | /* For each channel, ask the consumer to snapshot it. */ | |
894 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
07b86b52 | 895 | pthread_mutex_lock(socket->lock); |
6dc3064a | 896 | ret = consumer_snapshot_channel(socket, chan->fd, output, 0, |
5c786ded JD |
897 | ksess->uid, ksess->gid, |
898 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
899 | max_size_per_stream); | |
07b86b52 | 900 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
901 | if (ret < 0) { |
902 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
903 | (void) kernel_consumer_destroy_metadata(socket, |
904 | ksess->metadata); | |
6dc3064a DG |
905 | goto error_consumer; |
906 | } | |
907 | } | |
908 | ||
909 | /* Snapshot metadata, */ | |
07b86b52 | 910 | pthread_mutex_lock(socket->lock); |
6dc3064a | 911 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, |
5c786ded JD |
912 | 1, ksess->uid, ksess->gid, |
913 | DEFAULT_KERNEL_TRACE_DIR, wait, max_size_per_stream); | |
07b86b52 | 914 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
915 | if (ret < 0) { |
916 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
917 | goto error_consumer; | |
918 | } | |
07b86b52 JD |
919 | |
920 | /* | |
921 | * The metadata snapshot is done, ask the consumer to destroy it since | |
922 | * it's not monitored on the consumer side. | |
923 | */ | |
924 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
925 | } |
926 | ||
fac41e72 DG |
927 | ret = LTTNG_OK; |
928 | ||
6dc3064a DG |
929 | error_consumer: |
930 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
931 | err = close(ksess->metadata_stream_fd); |
932 | if (err < 0) { | |
6dc3064a DG |
933 | PERROR("close snapshot kernel"); |
934 | } | |
935 | ||
936 | error_open_stream: | |
937 | trace_kernel_destroy_metadata(ksess->metadata); | |
938 | error: | |
939 | /* Restore metadata state.*/ | |
940 | ksess->metadata = saved_metadata; | |
941 | ksess->metadata_stream_fd = saved_metadata_fd; | |
942 | ||
943 | rcu_read_unlock(); | |
944 | return ret; | |
945 | } |