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 | ||
6c1c0768 | 18 | #define _LGPL_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> |
c052142c | 29 | #include <common/kernel-ctl/kernel-ioctl.h> |
42224349 | 30 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 31 | |
2f77fc4b | 32 | #include "consumer.h" |
4771f025 | 33 | #include "kernel.h" |
6dc3064a | 34 | #include "kernel-consumer.h" |
096102bd | 35 | #include "kern-modules.h" |
834978fd | 36 | #include "utils.h" |
20fe2104 | 37 | |
d65106b1 | 38 | /* |
050349bb | 39 | * Add context on a kernel channel. |
f712b089 JG |
40 | * |
41 | * Assumes the ownership of ctx. | |
d65106b1 DG |
42 | */ |
43 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 44 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
45 | { |
46 | int ret; | |
47 | ||
0525e9ae DG |
48 | assert(chan); |
49 | assert(ctx); | |
50 | ||
d65106b1 | 51 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 52 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 53 | if (ret < 0) { |
1ae5e83e JD |
54 | switch (errno) { |
55 | case ENOSYS: | |
56 | /* Exists but not available for this kernel */ | |
57 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
58 | goto error; | |
59 | case EEXIST: | |
b579acd9 DG |
60 | /* If EEXIST, we just ignore the error */ |
61 | ret = 0; | |
1ae5e83e JD |
62 | goto end; |
63 | default: | |
64 | PERROR("add context ioctl"); | |
65 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
66 | goto error; | |
b579acd9 | 67 | } |
d65106b1 DG |
68 | } |
69 | ||
1ae5e83e | 70 | end: |
645328ae | 71 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
f712b089 | 72 | ctx = NULL; |
d65106b1 | 73 | error: |
f712b089 JG |
74 | if (ctx) { |
75 | trace_kernel_destroy_context(ctx); | |
76 | } | |
d65106b1 DG |
77 | return ret; |
78 | } | |
79 | ||
20fe2104 | 80 | /* |
050349bb DG |
81 | * Create a new kernel session, register it to the kernel tracer and add it to |
82 | * the session daemon session. | |
20fe2104 | 83 | */ |
8c0faa1d | 84 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
85 | { |
86 | int ret; | |
87 | struct ltt_kernel_session *lks; | |
88 | ||
0525e9ae DG |
89 | assert(session); |
90 | ||
54012638 | 91 | /* Allocate data structure */ |
dec56f6c | 92 | lks = trace_kernel_create_session(); |
20fe2104 | 93 | if (lks == NULL) { |
54012638 | 94 | ret = -1; |
20fe2104 DG |
95 | goto error; |
96 | } | |
97 | ||
54012638 | 98 | /* Kernel tracer session creation */ |
20fe2104 DG |
99 | ret = kernctl_create_session(tracer_fd); |
100 | if (ret < 0) { | |
df0f840b | 101 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
102 | goto error; |
103 | } | |
104 | ||
20fe2104 | 105 | lks->fd = ret; |
7b395890 DG |
106 | /* Prevent fd duplication after execlp() */ |
107 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
108 | if (ret < 0) { | |
df0f840b | 109 | PERROR("fcntl session fd"); |
7b395890 DG |
110 | } |
111 | ||
53632229 | 112 | lks->id = session->id; |
3bd1e081 | 113 | lks->consumer_fds_sent = 0; |
8c0faa1d | 114 | session->kernel_session = lks; |
8c0faa1d DG |
115 | |
116 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
117 | |
118 | return 0; | |
119 | ||
120 | error: | |
5f62c685 DG |
121 | if (lks) { |
122 | trace_kernel_destroy_session(lks); | |
123 | } | |
20fe2104 DG |
124 | return ret; |
125 | } | |
126 | ||
127 | /* | |
050349bb DG |
128 | * Create a kernel channel, register it to the kernel tracer and add it to the |
129 | * kernel session. | |
20fe2104 | 130 | */ |
050349bb | 131 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 132 | struct lttng_channel *chan) |
20fe2104 DG |
133 | { |
134 | int ret; | |
135 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 136 | |
0525e9ae DG |
137 | assert(session); |
138 | assert(chan); | |
0525e9ae | 139 | |
54012638 | 140 | /* Allocate kernel channel */ |
fdd9eb17 | 141 | lkc = trace_kernel_create_channel(chan); |
54012638 | 142 | if (lkc == NULL) { |
20fe2104 DG |
143 | goto error; |
144 | } | |
145 | ||
ecc48a90 | 146 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 147 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
148 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
149 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 150 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 151 | |
54012638 | 152 | /* Kernel tracer channel creation */ |
f3ed775e | 153 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 154 | if (ret < 0) { |
df0f840b | 155 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
156 | goto error; |
157 | } | |
158 | ||
54012638 | 159 | /* Setup the channel fd */ |
20fe2104 | 160 | lkc->fd = ret; |
7b395890 DG |
161 | /* Prevent fd duplication after execlp() */ |
162 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
163 | if (ret < 0) { | |
df0f840b | 164 | PERROR("fcntl session fd"); |
7b395890 DG |
165 | } |
166 | ||
54012638 | 167 | /* Add channel to session */ |
8c0faa1d DG |
168 | cds_list_add(&lkc->list, &session->channel_list.head); |
169 | session->channel_count++; | |
fb5f35b6 | 170 | lkc->session = session; |
20fe2104 | 171 | |
00e2e675 | 172 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
173 | |
174 | return 0; | |
175 | ||
176 | error: | |
5f62c685 DG |
177 | if (lkc) { |
178 | free(lkc->channel); | |
179 | free(lkc); | |
180 | } | |
54012638 | 181 | return -1; |
20fe2104 | 182 | } |
f34daff7 DG |
183 | |
184 | /* | |
050349bb DG |
185 | * Create a kernel event, enable it to the kernel tracer and add it to the |
186 | * channel event list of the kernel session. | |
49d21f93 | 187 | * We own filter_expression and filter. |
f34daff7 | 188 | */ |
050349bb | 189 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
190 | struct ltt_kernel_channel *channel, |
191 | char *filter_expression, | |
192 | struct lttng_filter_bytecode *filter) | |
f34daff7 DG |
193 | { |
194 | int ret; | |
195 | struct ltt_kernel_event *event; | |
f34daff7 | 196 | |
0525e9ae DG |
197 | assert(ev); |
198 | assert(channel); | |
199 | ||
a969e101 | 200 | /* We pass ownership of filter_expression and filter */ |
00a62084 MD |
201 | event = trace_kernel_create_event(ev, filter_expression, |
202 | filter); | |
54012638 | 203 | if (event == NULL) { |
d87bfb32 | 204 | ret = -1; |
f34daff7 DG |
205 | goto error; |
206 | } | |
207 | ||
f3ed775e DG |
208 | ret = kernctl_create_event(channel->fd, event->event); |
209 | if (ret < 0) { | |
bd29c13d DG |
210 | switch (errno) { |
211 | case EEXIST: | |
212 | break; | |
213 | case ENOSYS: | |
214 | WARN("Event type not implemented"); | |
215 | break; | |
8197a339 DG |
216 | case ENOENT: |
217 | WARN("Event %s not found!", ev->name); | |
218 | break; | |
bd29c13d | 219 | default: |
d87bfb32 DG |
220 | PERROR("create event ioctl"); |
221 | } | |
222 | ret = -errno; | |
e953ef25 | 223 | goto free_event; |
8c0faa1d | 224 | } |
f34daff7 | 225 | |
d0ae4ea8 | 226 | event->type = ev->type; |
f3ed775e | 227 | event->fd = ret; |
7b395890 DG |
228 | /* Prevent fd duplication after execlp() */ |
229 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
230 | if (ret < 0) { | |
df0f840b | 231 | PERROR("fcntl session fd"); |
7b395890 DG |
232 | } |
233 | ||
00a62084 MD |
234 | if (filter) { |
235 | ret = kernctl_filter(event->fd, filter); | |
236 | if (ret) { | |
237 | goto filter_error; | |
238 | } | |
239 | } | |
240 | ||
241 | ret = kernctl_enable(event->fd); | |
242 | if (ret < 0) { | |
243 | switch (errno) { | |
244 | case EEXIST: | |
245 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
246 | break; | |
247 | default: | |
248 | PERROR("enable kernel event"); | |
249 | break; | |
250 | } | |
251 | goto enable_error; | |
252 | } | |
253 | ||
f3ed775e DG |
254 | /* Add event to event list */ |
255 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
256 | channel->event_count++; |
257 | ||
e953ef25 DG |
258 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
259 | ||
260 | return 0; | |
261 | ||
00a62084 MD |
262 | enable_error: |
263 | filter_error: | |
264 | { | |
265 | int closeret; | |
266 | ||
267 | closeret = close(event->fd); | |
268 | if (closeret) { | |
269 | PERROR("close event fd"); | |
270 | } | |
271 | } | |
e953ef25 DG |
272 | free_event: |
273 | free(event); | |
274 | error: | |
d87bfb32 | 275 | return ret; |
e953ef25 DG |
276 | } |
277 | ||
26cc6b4e | 278 | /* |
050349bb | 279 | * Disable a kernel channel. |
26cc6b4e DG |
280 | */ |
281 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
282 | { | |
283 | int ret; | |
284 | ||
0525e9ae DG |
285 | assert(chan); |
286 | ||
26cc6b4e DG |
287 | ret = kernctl_disable(chan->fd); |
288 | if (ret < 0) { | |
df0f840b | 289 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
290 | ret = errno; |
291 | goto error; | |
292 | } | |
293 | ||
294 | chan->enabled = 0; | |
295 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
296 | ||
297 | return 0; | |
298 | ||
299 | error: | |
300 | return ret; | |
301 | } | |
302 | ||
d36b8583 | 303 | /* |
050349bb | 304 | * Enable a kernel channel. |
d36b8583 DG |
305 | */ |
306 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
307 | { | |
308 | int ret; | |
309 | ||
0525e9ae DG |
310 | assert(chan); |
311 | ||
d36b8583 | 312 | ret = kernctl_enable(chan->fd); |
54d01ffb | 313 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 314 | PERROR("Enable kernel chan"); |
d36b8583 DG |
315 | goto error; |
316 | } | |
317 | ||
318 | chan->enabled = 1; | |
319 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
320 | ||
321 | return 0; | |
322 | ||
323 | error: | |
324 | return ret; | |
325 | } | |
326 | ||
19e70852 | 327 | /* |
050349bb | 328 | * Enable a kernel event. |
19e70852 DG |
329 | */ |
330 | int kernel_enable_event(struct ltt_kernel_event *event) | |
331 | { | |
332 | int ret; | |
333 | ||
0525e9ae DG |
334 | assert(event); |
335 | ||
19e70852 | 336 | ret = kernctl_enable(event->fd); |
42224349 DG |
337 | if (ret < 0) { |
338 | switch (errno) { | |
339 | case EEXIST: | |
f73fabfd | 340 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
341 | break; |
342 | default: | |
343 | PERROR("enable kernel event"); | |
344 | break; | |
345 | } | |
19e70852 DG |
346 | goto error; |
347 | } | |
348 | ||
349 | event->enabled = 1; | |
350 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
351 | ||
352 | return 0; | |
353 | ||
354 | error: | |
d36b8583 | 355 | return ret; |
19e70852 DG |
356 | } |
357 | ||
e953ef25 | 358 | /* |
050349bb | 359 | * Disable a kernel event. |
e953ef25 | 360 | */ |
19e70852 | 361 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
362 | { |
363 | int ret; | |
19e70852 | 364 | |
0525e9ae DG |
365 | assert(event); |
366 | ||
19e70852 | 367 | ret = kernctl_disable(event->fd); |
42224349 DG |
368 | if (ret < 0) { |
369 | switch (errno) { | |
370 | case EEXIST: | |
f73fabfd | 371 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
372 | break; |
373 | default: | |
374 | PERROR("disable kernel event"); | |
375 | break; | |
376 | } | |
19e70852 | 377 | goto error; |
e953ef25 | 378 | } |
f3ed775e | 379 | |
19e70852 DG |
380 | event->enabled = 0; |
381 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
382 | ||
f34daff7 DG |
383 | return 0; |
384 | ||
385 | error: | |
d36b8583 | 386 | return ret; |
f34daff7 | 387 | } |
aaf26714 | 388 | |
6e911cad | 389 | |
ccf10263 MD |
390 | int kernel_track_pid(struct ltt_kernel_session *session, int pid) |
391 | { | |
7c493d31 MD |
392 | int ret; |
393 | ||
ccf10263 MD |
394 | DBG("Kernel track PID %d for session id %" PRIu64 ".", |
395 | pid, session->id); | |
7c493d31 MD |
396 | ret = kernctl_track_pid(session->fd, pid); |
397 | if (!ret) { | |
398 | return LTTNG_OK; | |
399 | } | |
400 | switch (errno) { | |
401 | case EINVAL: | |
402 | return LTTNG_ERR_INVALID; | |
403 | case ENOMEM: | |
404 | return LTTNG_ERR_NOMEM; | |
405 | case EEXIST: | |
406 | return LTTNG_ERR_PID_TRACKED; | |
407 | default: | |
408 | return LTTNG_ERR_UNK; | |
409 | } | |
ccf10263 MD |
410 | } |
411 | ||
412 | int kernel_untrack_pid(struct ltt_kernel_session *session, int pid) | |
413 | { | |
7c493d31 MD |
414 | int ret; |
415 | ||
ccf10263 MD |
416 | DBG("Kernel untrack PID %d for session id %" PRIu64 ".", |
417 | pid, session->id); | |
7c493d31 MD |
418 | ret = kernctl_untrack_pid(session->fd, pid); |
419 | if (!ret) { | |
420 | return LTTNG_OK; | |
421 | } | |
422 | switch (errno) { | |
423 | case EINVAL: | |
424 | return LTTNG_ERR_INVALID; | |
425 | case ENOMEM: | |
426 | return LTTNG_ERR_NOMEM; | |
427 | case ENOENT: | |
428 | return LTTNG_ERR_PID_NOT_TRACKED; | |
429 | default: | |
430 | return LTTNG_ERR_UNK; | |
431 | } | |
ccf10263 MD |
432 | } |
433 | ||
a5dfbb9d MD |
434 | ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session, |
435 | int **_pids) | |
436 | { | |
437 | int fd, ret; | |
438 | int pid; | |
439 | ssize_t nbmem, count = 0; | |
440 | FILE *fp; | |
441 | int *pids; | |
442 | ||
443 | fd = kernctl_list_tracker_pids(session->fd); | |
444 | if (fd < 0) { | |
445 | PERROR("kernel tracker pids list"); | |
446 | goto error; | |
447 | } | |
448 | ||
449 | fp = fdopen(fd, "r"); | |
450 | if (fp == NULL) { | |
451 | PERROR("kernel tracker pids list fdopen"); | |
452 | goto error_fp; | |
453 | } | |
454 | ||
455 | nbmem = KERNEL_TRACKER_PIDS_INIT_LIST_SIZE; | |
456 | pids = zmalloc(sizeof(*pids) * nbmem); | |
457 | if (pids == NULL) { | |
458 | PERROR("alloc list pids"); | |
459 | count = -ENOMEM; | |
460 | goto end; | |
461 | } | |
462 | ||
463 | while (fscanf(fp, "process { pid = %u; };\n", &pid) == 1) { | |
464 | if (count >= nbmem) { | |
465 | int *new_pids; | |
466 | size_t new_nbmem; | |
467 | ||
468 | new_nbmem = nbmem << 1; | |
469 | DBG("Reallocating pids list from %zu to %zu entries", | |
470 | nbmem, new_nbmem); | |
471 | new_pids = realloc(pids, new_nbmem * sizeof(*new_pids)); | |
472 | if (new_pids == NULL) { | |
473 | PERROR("realloc list events"); | |
474 | free(pids); | |
475 | count = -ENOMEM; | |
476 | goto end; | |
477 | } | |
478 | /* Zero the new memory */ | |
479 | memset(new_pids + nbmem, 0, | |
480 | (new_nbmem - nbmem) * sizeof(*new_pids)); | |
481 | nbmem = new_nbmem; | |
482 | pids = new_pids; | |
483 | } | |
484 | pids[count++] = pid; | |
485 | } | |
486 | ||
487 | *_pids = pids; | |
488 | DBG("Kernel list tracker pids done (%zd pids)", count); | |
489 | end: | |
490 | ret = fclose(fp); /* closes both fp and fd */ | |
491 | if (ret) { | |
492 | PERROR("fclose"); | |
493 | } | |
494 | return count; | |
495 | ||
496 | error_fp: | |
497 | ret = close(fd); | |
498 | if (ret) { | |
499 | PERROR("close"); | |
500 | } | |
501 | error: | |
502 | return -1; | |
503 | } | |
504 | ||
aaf26714 | 505 | /* |
050349bb DG |
506 | * Create kernel metadata, open from the kernel tracer and add it to the |
507 | * kernel session. | |
aaf26714 | 508 | */ |
a4b92340 | 509 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
510 | { |
511 | int ret; | |
74024a21 | 512 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 513 | |
0525e9ae DG |
514 | assert(session); |
515 | ||
54012638 | 516 | /* Allocate kernel metadata */ |
a4b92340 | 517 | lkm = trace_kernel_create_metadata(); |
54012638 | 518 | if (lkm == NULL) { |
aaf26714 DG |
519 | goto error; |
520 | } | |
521 | ||
54012638 | 522 | /* Kernel tracer metadata creation */ |
f3ed775e | 523 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 524 | if (ret < 0) { |
74024a21 | 525 | goto error_open; |
aaf26714 DG |
526 | } |
527 | ||
8c0faa1d | 528 | lkm->fd = ret; |
7b395890 DG |
529 | /* Prevent fd duplication after execlp() */ |
530 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
531 | if (ret < 0) { | |
df0f840b | 532 | PERROR("fcntl session fd"); |
7b395890 DG |
533 | } |
534 | ||
aaf26714 | 535 | session->metadata = lkm; |
8c0faa1d | 536 | |
00e2e675 | 537 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
538 | |
539 | return 0; | |
540 | ||
74024a21 DG |
541 | error_open: |
542 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 543 | error: |
54012638 | 544 | return -1; |
8c0faa1d DG |
545 | } |
546 | ||
547 | /* | |
050349bb | 548 | * Start tracing session. |
8c0faa1d DG |
549 | */ |
550 | int kernel_start_session(struct ltt_kernel_session *session) | |
551 | { | |
552 | int ret; | |
553 | ||
0525e9ae DG |
554 | assert(session); |
555 | ||
8c0faa1d DG |
556 | ret = kernctl_start_session(session->fd); |
557 | if (ret < 0) { | |
df0f840b | 558 | PERROR("ioctl start session"); |
8c0faa1d DG |
559 | goto error; |
560 | } | |
561 | ||
562 | DBG("Kernel session started"); | |
563 | ||
564 | return 0; | |
565 | ||
566 | error: | |
567 | return ret; | |
568 | } | |
569 | ||
f3ed775e | 570 | /* |
050349bb | 571 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
572 | */ |
573 | void kernel_wait_quiescent(int fd) | |
574 | { | |
575 | int ret; | |
576 | ||
577 | DBG("Kernel quiescent wait on %d", fd); | |
578 | ||
579 | ret = kernctl_wait_quiescent(fd); | |
580 | if (ret < 0) { | |
df0f840b | 581 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
582 | ERR("Kernel quiescent wait failed"); |
583 | } | |
584 | } | |
585 | ||
d0254c7c | 586 | /* |
050349bb | 587 | * Kernel calibrate |
d0254c7c MD |
588 | */ |
589 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
590 | { | |
591 | int ret; | |
592 | ||
0525e9ae DG |
593 | assert(calibrate); |
594 | ||
d0254c7c MD |
595 | ret = kernctl_calibrate(fd, calibrate); |
596 | if (ret < 0) { | |
df0f840b | 597 | PERROR("calibrate ioctl"); |
d0254c7c MD |
598 | return -1; |
599 | } | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | ||
f3ed775e | 605 | /* |
f3ed775e DG |
606 | * Force flush buffer of metadata. |
607 | */ | |
608 | int kernel_metadata_flush_buffer(int fd) | |
609 | { | |
610 | int ret; | |
611 | ||
169d2cb7 DG |
612 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
613 | ||
f3ed775e DG |
614 | ret = kernctl_buffer_flush(fd); |
615 | if (ret < 0) { | |
00e2e675 | 616 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
617 | } |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | /* | |
050349bb | 623 | * Force flush buffer for channel. |
f3ed775e DG |
624 | */ |
625 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
626 | { | |
627 | int ret; | |
628 | struct ltt_kernel_stream *stream; | |
629 | ||
0525e9ae DG |
630 | assert(channel); |
631 | ||
f3ed775e DG |
632 | DBG("Flush buffer for channel %s", channel->channel->name); |
633 | ||
634 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
635 | DBG("Flushing channel stream %d", stream->fd); | |
636 | ret = kernctl_buffer_flush(stream->fd); | |
637 | if (ret < 0) { | |
df0f840b | 638 | PERROR("ioctl"); |
f3ed775e DG |
639 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
640 | stream->fd, ret); | |
641 | } | |
642 | } | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
8c0faa1d | 647 | /* |
050349bb | 648 | * Stop tracing session. |
8c0faa1d DG |
649 | */ |
650 | int kernel_stop_session(struct ltt_kernel_session *session) | |
651 | { | |
652 | int ret; | |
653 | ||
0525e9ae DG |
654 | assert(session); |
655 | ||
8c0faa1d DG |
656 | ret = kernctl_stop_session(session->fd); |
657 | if (ret < 0) { | |
658 | goto error; | |
659 | } | |
660 | ||
661 | DBG("Kernel session stopped"); | |
662 | ||
663 | return 0; | |
664 | ||
665 | error: | |
666 | return ret; | |
667 | } | |
668 | ||
669 | /* | |
050349bb DG |
670 | * Open stream of channel, register it to the kernel tracer and add it |
671 | * to the stream list of the channel. | |
8c0faa1d | 672 | * |
a2d808db MD |
673 | * Note: given that the streams may appear in random order wrt CPU |
674 | * number (e.g. cpu hotplug), the index value of the stream number in | |
675 | * the stream name is not necessarily linked to the CPU number. | |
676 | * | |
050349bb | 677 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 678 | */ |
f3ed775e | 679 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 680 | { |
a2d808db | 681 | int ret; |
8c0faa1d DG |
682 | struct ltt_kernel_stream *lks; |
683 | ||
0525e9ae DG |
684 | assert(channel); |
685 | ||
5a47c6a2 | 686 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
a2d808db MD |
687 | lks = trace_kernel_create_stream(channel->channel->name, |
688 | channel->stream_count); | |
8c0faa1d | 689 | if (lks == NULL) { |
799e2c4f MD |
690 | ret = close(ret); |
691 | if (ret) { | |
692 | PERROR("close"); | |
693 | } | |
8c0faa1d DG |
694 | goto error; |
695 | } | |
696 | ||
697 | lks->fd = ret; | |
7b395890 DG |
698 | /* Prevent fd duplication after execlp() */ |
699 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
700 | if (ret < 0) { | |
df0f840b | 701 | PERROR("fcntl session fd"); |
7b395890 DG |
702 | } |
703 | ||
1624d5b7 JD |
704 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
705 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
706 | ||
a2d808db | 707 | /* Add stream to channel stream list */ |
8c0faa1d DG |
708 | cds_list_add(&lks->list, &channel->stream_list.head); |
709 | channel->stream_count++; | |
8c0faa1d | 710 | |
00e2e675 DG |
711 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, |
712 | lks->state); | |
54012638 | 713 | } |
8c0faa1d DG |
714 | |
715 | return channel->stream_count; | |
716 | ||
717 | error: | |
54012638 | 718 | return -1; |
8c0faa1d DG |
719 | } |
720 | ||
721 | /* | |
050349bb | 722 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 723 | */ |
f3ed775e | 724 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
725 | { |
726 | int ret; | |
727 | ||
0525e9ae DG |
728 | assert(session); |
729 | ||
8c0faa1d DG |
730 | ret = kernctl_create_stream(session->metadata->fd); |
731 | if (ret < 0) { | |
df0f840b | 732 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
733 | goto error; |
734 | } | |
735 | ||
736 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
737 | session->metadata_stream_fd = ret; | |
7b395890 DG |
738 | /* Prevent fd duplication after execlp() */ |
739 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
740 | if (ret < 0) { | |
df0f840b | 741 | PERROR("fcntl session fd"); |
7b395890 | 742 | } |
aaf26714 DG |
743 | |
744 | return 0; | |
745 | ||
746 | error: | |
54012638 | 747 | return -1; |
aaf26714 | 748 | } |
2ef84c95 DG |
749 | |
750 | /* | |
9f19cc17 | 751 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 752 | */ |
9f19cc17 | 753 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 754 | { |
53efb85a | 755 | int fd, ret; |
9f19cc17 DG |
756 | char *event; |
757 | size_t nbmem, count = 0; | |
2ef84c95 | 758 | FILE *fp; |
9f19cc17 | 759 | struct lttng_event *elist; |
2ef84c95 | 760 | |
0525e9ae DG |
761 | assert(events); |
762 | ||
2ef84c95 DG |
763 | fd = kernctl_tracepoint_list(tracer_fd); |
764 | if (fd < 0) { | |
df0f840b | 765 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
766 | goto error; |
767 | } | |
768 | ||
769 | fp = fdopen(fd, "r"); | |
770 | if (fp == NULL) { | |
df0f840b | 771 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 772 | goto error_fp; |
2ef84c95 DG |
773 | } |
774 | ||
775 | /* | |
776 | * Init memory size counter | |
777 | * See kernel-ctl.h for explanation of this value | |
778 | */ | |
6725fe19 | 779 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 780 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
781 | if (elist == NULL) { |
782 | PERROR("alloc list events"); | |
783 | count = -ENOMEM; | |
784 | goto end; | |
785 | } | |
2ef84c95 | 786 | |
53efb85a | 787 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 788 | if (count >= nbmem) { |
3b870559 | 789 | struct lttng_event *new_elist; |
53efb85a | 790 | size_t new_nbmem; |
3b870559 | 791 | |
53efb85a MD |
792 | new_nbmem = nbmem << 1; |
793 | DBG("Reallocating event list from %zu to %zu bytes", | |
794 | nbmem, new_nbmem); | |
795 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 796 | if (new_elist == NULL) { |
df0f840b | 797 | PERROR("realloc list events"); |
3b870559 MD |
798 | free(event); |
799 | free(elist); | |
61b73b12 MD |
800 | count = -ENOMEM; |
801 | goto end; | |
2ef84c95 | 802 | } |
53efb85a MD |
803 | /* Zero the new memory */ |
804 | memset(new_elist + nbmem, 0, | |
805 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
806 | nbmem = new_nbmem; | |
3b870559 | 807 | elist = new_elist; |
2ef84c95 | 808 | } |
99497cd0 MD |
809 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
810 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 811 | elist[count].enabled = -1; |
9f19cc17 | 812 | count++; |
3b870559 | 813 | free(event); |
2ef84c95 DG |
814 | } |
815 | ||
9f19cc17 | 816 | *events = elist; |
ced2f820 | 817 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 818 | end: |
799e2c4f MD |
819 | ret = fclose(fp); /* closes both fp and fd */ |
820 | if (ret) { | |
821 | PERROR("fclose"); | |
822 | } | |
9f19cc17 | 823 | return count; |
2ef84c95 | 824 | |
61b73b12 | 825 | error_fp: |
799e2c4f MD |
826 | ret = close(fd); |
827 | if (ret) { | |
828 | PERROR("close"); | |
829 | } | |
2ef84c95 DG |
830 | error: |
831 | return -1; | |
832 | } | |
096102bd DG |
833 | |
834 | /* | |
835 | * Get kernel version and validate it. | |
836 | */ | |
837 | int kernel_validate_version(int tracer_fd) | |
838 | { | |
839 | int ret; | |
840 | struct lttng_kernel_tracer_version version; | |
c052142c | 841 | struct lttng_kernel_tracer_abi_version abi_version; |
096102bd DG |
842 | |
843 | ret = kernctl_tracer_version(tracer_fd, &version); | |
844 | if (ret < 0) { | |
eeea8714 | 845 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
846 | goto error; |
847 | } | |
848 | ||
849 | /* Validate version */ | |
c052142c MD |
850 | if (version.major != VERSION_MAJOR) { |
851 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", | |
852 | version.major, VERSION_MAJOR); | |
096102bd | 853 | goto error_version; |
096102bd | 854 | } |
c052142c MD |
855 | ret = kernctl_tracer_abi_version(tracer_fd, &abi_version); |
856 | if (ret < 0) { | |
eeea8714 | 857 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
858 | goto error; |
859 | } | |
860 | if (abi_version.major != LTTNG_MODULES_ABI_MAJOR_VERSION) { | |
eeea8714 | 861 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
c052142c MD |
862 | abi_version.major, abi_version.minor, |
863 | LTTNG_MODULES_ABI_MAJOR_VERSION); | |
864 | goto error; | |
865 | } | |
866 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
867 | version.major, version.minor, | |
868 | abi_version.major, abi_version.minor); | |
096102bd DG |
869 | return 0; |
870 | ||
871 | error_version: | |
096102bd DG |
872 | ret = -1; |
873 | ||
874 | error: | |
eeea8714 | 875 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
876 | return ret; |
877 | } | |
335a95b7 MD |
878 | |
879 | /* | |
880 | * Kernel work-arounds called at the start of sessiond main(). | |
881 | */ | |
882 | int init_kernel_workarounds(void) | |
883 | { | |
8936c33a | 884 | int ret; |
335a95b7 MD |
885 | FILE *fp; |
886 | ||
887 | /* | |
888 | * boot_id needs to be read once before being used concurrently | |
889 | * to deal with a Linux kernel race. A fix is proposed for | |
890 | * upstream, but the work-around is needed for older kernels. | |
891 | */ | |
892 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
893 | if (!fp) { | |
894 | goto end_boot_id; | |
895 | } | |
896 | while (!feof(fp)) { | |
897 | char buf[37] = ""; | |
898 | ||
8936c33a DG |
899 | ret = fread(buf, 1, sizeof(buf), fp); |
900 | if (ret < 0) { | |
901 | /* Ignore error, we don't really care */ | |
902 | } | |
335a95b7 | 903 | } |
799e2c4f MD |
904 | ret = fclose(fp); |
905 | if (ret) { | |
906 | PERROR("fclose"); | |
907 | } | |
335a95b7 | 908 | end_boot_id: |
335a95b7 MD |
909 | return 0; |
910 | } | |
2f77fc4b DG |
911 | |
912 | /* | |
913 | * Complete teardown of a kernel session. | |
914 | */ | |
915 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
916 | { | |
917 | if (ksess == NULL) { | |
918 | DBG3("No kernel session when tearing down session"); | |
919 | return; | |
920 | } | |
921 | ||
922 | DBG("Tearing down kernel session"); | |
923 | ||
07b86b52 | 924 | /* |
15dc512a DG |
925 | * Destroy channels on the consumer if at least one FD has been sent and we |
926 | * are in no output mode because the streams are in *no* monitor mode so we | |
927 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 928 | */ |
15dc512a | 929 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
930 | int ret; |
931 | struct consumer_socket *socket; | |
932 | struct lttng_ht_iter iter; | |
933 | ||
934 | /* For each consumer socket. */ | |
d069d577 | 935 | rcu_read_lock(); |
07b86b52 JD |
936 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
937 | socket, node.node) { | |
938 | struct ltt_kernel_channel *chan; | |
939 | ||
940 | /* For each channel, ask the consumer to destroy it. */ | |
941 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
942 | ret = kernel_consumer_destroy_channel(socket, chan); | |
943 | if (ret < 0) { | |
944 | /* Consumer is probably dead. Use next socket. */ | |
945 | continue; | |
946 | } | |
947 | } | |
948 | } | |
d069d577 | 949 | rcu_read_unlock(); |
07b86b52 JD |
950 | } |
951 | ||
2f77fc4b DG |
952 | /* Close any relayd session */ |
953 | consumer_output_send_destroy_relayd(ksess->consumer); | |
954 | ||
955 | trace_kernel_destroy_session(ksess); | |
956 | } | |
fb5f35b6 DG |
957 | |
958 | /* | |
959 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
960 | */ | |
961 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
962 | { | |
963 | struct ltt_kernel_session *ksess = NULL; | |
964 | ||
965 | assert(kchan); | |
966 | assert(kchan->channel); | |
967 | ||
968 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
969 | ||
970 | /* Update channel count of associated session. */ | |
971 | if (kchan->session) { | |
972 | /* Keep pointer reference so we can update it after the destroy. */ | |
973 | ksess = kchan->session; | |
974 | } | |
975 | ||
976 | trace_kernel_destroy_channel(kchan); | |
977 | ||
978 | /* | |
979 | * At this point the kernel channel is not visible anymore. This is safe | |
980 | * since in order to work on a visible kernel session, the tracing session | |
981 | * lock (ltt_session.lock) MUST be acquired. | |
982 | */ | |
983 | if (ksess) { | |
984 | ksess->channel_count--; | |
985 | } | |
986 | } | |
6dc3064a DG |
987 | |
988 | /* | |
989 | * Take a snapshot for a given kernel session. | |
990 | * | |
2a06df8d | 991 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
992 | */ |
993 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
d07ceecd MD |
994 | struct snapshot_output *output, int wait, |
995 | uint64_t nb_packets_per_stream) | |
6dc3064a | 996 | { |
2a06df8d | 997 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
998 | struct consumer_socket *socket; |
999 | struct lttng_ht_iter iter; | |
1000 | struct ltt_kernel_metadata *saved_metadata; | |
1001 | ||
1002 | assert(ksess); | |
1003 | assert(ksess->consumer); | |
1004 | assert(output); | |
1005 | ||
1006 | DBG("Kernel snapshot record started"); | |
1007 | ||
1008 | /* Save current metadata since the following calls will change it. */ | |
1009 | saved_metadata = ksess->metadata; | |
1010 | saved_metadata_fd = ksess->metadata_stream_fd; | |
1011 | ||
1012 | rcu_read_lock(); | |
1013 | ||
1014 | ret = kernel_open_metadata(ksess); | |
1015 | if (ret < 0) { | |
1016 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1017 | goto error; | |
1018 | } | |
1019 | ||
1020 | ret = kernel_open_metadata_stream(ksess); | |
1021 | if (ret < 0) { | |
1022 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1023 | goto error_open_stream; | |
1024 | } | |
1025 | ||
1026 | /* Send metadata to consumer and snapshot everything. */ | |
1027 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1028 | socket, node.node) { | |
1029 | struct consumer_output *saved_output; | |
1030 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
1031 | |
1032 | /* | |
1033 | * Temporarly switch consumer output for our snapshot output. As long | |
1034 | * as the session lock is taken, this is safe. | |
1035 | */ | |
1036 | saved_output = ksess->consumer; | |
1037 | ksess->consumer = output->consumer; | |
1038 | ||
1039 | pthread_mutex_lock(socket->lock); | |
1040 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1041 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1042 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 1043 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
1044 | ksess->consumer = saved_output; |
1045 | if (ret < 0) { | |
1046 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1047 | goto error_consumer; | |
1048 | } | |
1049 | ||
1050 | /* For each channel, ask the consumer to snapshot it. */ | |
1051 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
07b86b52 | 1052 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1053 | ret = consumer_snapshot_channel(socket, chan->fd, output, 0, |
5c786ded JD |
1054 | ksess->uid, ksess->gid, |
1055 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
d07ceecd | 1056 | nb_packets_per_stream); |
07b86b52 | 1057 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1058 | if (ret < 0) { |
1059 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
1060 | (void) kernel_consumer_destroy_metadata(socket, |
1061 | ksess->metadata); | |
6dc3064a DG |
1062 | goto error_consumer; |
1063 | } | |
1064 | } | |
1065 | ||
1066 | /* Snapshot metadata, */ | |
07b86b52 | 1067 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1068 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, |
5c786ded | 1069 | 1, ksess->uid, ksess->gid, |
d07ceecd | 1070 | DEFAULT_KERNEL_TRACE_DIR, wait, 0); |
07b86b52 | 1071 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1072 | if (ret < 0) { |
1073 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1074 | goto error_consumer; | |
1075 | } | |
07b86b52 JD |
1076 | |
1077 | /* | |
1078 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1079 | * it's not monitored on the consumer side. | |
1080 | */ | |
1081 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1082 | } |
1083 | ||
fac41e72 DG |
1084 | ret = LTTNG_OK; |
1085 | ||
6dc3064a DG |
1086 | error_consumer: |
1087 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1088 | err = close(ksess->metadata_stream_fd); |
1089 | if (err < 0) { | |
6dc3064a DG |
1090 | PERROR("close snapshot kernel"); |
1091 | } | |
1092 | ||
1093 | error_open_stream: | |
1094 | trace_kernel_destroy_metadata(ksess->metadata); | |
1095 | error: | |
1096 | /* Restore metadata state.*/ | |
1097 | ksess->metadata = saved_metadata; | |
1098 | ksess->metadata_stream_fd = saved_metadata_fd; | |
1099 | ||
1100 | rcu_read_unlock(); | |
1101 | return ret; | |
1102 | } | |
834978fd DG |
1103 | |
1104 | /* | |
1105 | * Get the syscall mask array from the kernel tracer. | |
1106 | * | |
1107 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1108 | * be freed. | |
1109 | */ | |
1110 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1111 | { | |
1112 | assert(syscall_mask); | |
1113 | assert(nr_bits); | |
1114 | ||
1115 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1116 | } |