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 |
7b395890 | 19 | #include <fcntl.h> |
20fe2104 DG |
20 | #include <stdlib.h> |
21 | #include <stdio.h> | |
f34daff7 | 22 | #include <string.h> |
8c0faa1d | 23 | #include <unistd.h> |
77c7c900 | 24 | #include <inttypes.h> |
20fe2104 | 25 | |
990570ed | 26 | #include <common/common.h> |
db758600 | 27 | #include <common/kernel-ctl/kernel-ctl.h> |
c052142c | 28 | #include <common/kernel-ctl/kernel-ioctl.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" |
834978fd | 35 | #include "utils.h" |
5c408ad8 | 36 | #include "rotate.h" |
20fe2104 | 37 | |
e1f3997a JD |
38 | /* |
39 | * Key used to reference a channel between the sessiond and the consumer. This | |
40 | * is only read and updated with the session_list lock held. | |
41 | */ | |
42 | static uint64_t next_kernel_channel_key; | |
43 | ||
410b78a0 FD |
44 | #include <lttng/userspace-probe.h> |
45 | #include <lttng/userspace-probe-internal.h> | |
d65106b1 | 46 | /* |
050349bb | 47 | * Add context on a kernel channel. |
df3c77c8 JG |
48 | * |
49 | * Assumes the ownership of ctx. | |
d65106b1 DG |
50 | */ |
51 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 52 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
53 | { |
54 | int ret; | |
55 | ||
0525e9ae DG |
56 | assert(chan); |
57 | assert(ctx); | |
58 | ||
d65106b1 | 59 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 60 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 61 | if (ret < 0) { |
32af2c95 | 62 | switch (-ret) { |
1ae5e83e JD |
63 | case ENOSYS: |
64 | /* Exists but not available for this kernel */ | |
65 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
66 | goto error; | |
67 | case EEXIST: | |
b579acd9 DG |
68 | /* If EEXIST, we just ignore the error */ |
69 | ret = 0; | |
1ae5e83e JD |
70 | goto end; |
71 | default: | |
72 | PERROR("add context ioctl"); | |
73 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
74 | goto error; | |
b579acd9 | 75 | } |
d65106b1 | 76 | } |
21ed98c1 | 77 | ret = 0; |
d65106b1 | 78 | |
1ae5e83e | 79 | end: |
645328ae | 80 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
ba985c3a | 81 | ctx->in_list = true; |
df3c77c8 | 82 | ctx = NULL; |
d65106b1 | 83 | error: |
df3c77c8 JG |
84 | if (ctx) { |
85 | trace_kernel_destroy_context(ctx); | |
86 | } | |
d65106b1 DG |
87 | return ret; |
88 | } | |
89 | ||
20fe2104 | 90 | /* |
050349bb DG |
91 | * Create a new kernel session, register it to the kernel tracer and add it to |
92 | * the session daemon session. | |
20fe2104 | 93 | */ |
8c0faa1d | 94 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
95 | { |
96 | int ret; | |
97 | struct ltt_kernel_session *lks; | |
98 | ||
0525e9ae DG |
99 | assert(session); |
100 | ||
54012638 | 101 | /* Allocate data structure */ |
dec56f6c | 102 | lks = trace_kernel_create_session(); |
20fe2104 | 103 | if (lks == NULL) { |
54012638 | 104 | ret = -1; |
20fe2104 DG |
105 | goto error; |
106 | } | |
107 | ||
54012638 | 108 | /* Kernel tracer session creation */ |
20fe2104 DG |
109 | ret = kernctl_create_session(tracer_fd); |
110 | if (ret < 0) { | |
df0f840b | 111 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
112 | goto error; |
113 | } | |
114 | ||
20fe2104 | 115 | lks->fd = ret; |
7b395890 DG |
116 | /* Prevent fd duplication after execlp() */ |
117 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
118 | if (ret < 0) { | |
df0f840b | 119 | PERROR("fcntl session fd"); |
7b395890 DG |
120 | } |
121 | ||
53632229 | 122 | lks->id = session->id; |
3bd1e081 | 123 | lks->consumer_fds_sent = 0; |
8c0faa1d | 124 | session->kernel_session = lks; |
8c0faa1d DG |
125 | |
126 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 | 127 | |
b2543b20 JR |
128 | /* |
129 | * This is necessary since the creation time is present in the session | |
130 | * name when it is generated. | |
131 | */ | |
132 | if (session->has_auto_generated_name) { | |
133 | ret = kernctl_session_set_name(lks->fd, DEFAULT_SESSION_NAME); | |
134 | } else { | |
135 | ret = kernctl_session_set_name(lks->fd, session->name); | |
136 | } | |
49938fb6 | 137 | if (ret) { |
b2543b20 JR |
138 | WARN("Could not set kernel session name for session %" PRIu64 " name: %s", |
139 | session->id, session->name); | |
49938fb6 JR |
140 | } |
141 | ||
da7587b7 JR |
142 | ret = kernctl_session_set_creation_time(lks->fd, session->creation_time); |
143 | if (ret) { | |
b2543b20 JR |
144 | WARN("Could not set kernel session creation time for session %" PRIu64 " name: %s", |
145 | session->id, session->name); | |
da7587b7 JR |
146 | } |
147 | ||
20fe2104 DG |
148 | return 0; |
149 | ||
150 | error: | |
5f62c685 DG |
151 | if (lks) { |
152 | trace_kernel_destroy_session(lks); | |
153 | } | |
20fe2104 DG |
154 | return ret; |
155 | } | |
156 | ||
157 | /* | |
050349bb DG |
158 | * Create a kernel channel, register it to the kernel tracer and add it to the |
159 | * kernel session. | |
20fe2104 | 160 | */ |
050349bb | 161 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 162 | struct lttng_channel *chan) |
20fe2104 DG |
163 | { |
164 | int ret; | |
165 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 166 | |
0525e9ae DG |
167 | assert(session); |
168 | assert(chan); | |
0525e9ae | 169 | |
54012638 | 170 | /* Allocate kernel channel */ |
fdd9eb17 | 171 | lkc = trace_kernel_create_channel(chan); |
54012638 | 172 | if (lkc == NULL) { |
20fe2104 DG |
173 | goto error; |
174 | } | |
175 | ||
ecc48a90 | 176 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 177 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
178 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
179 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 180 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 181 | |
54012638 | 182 | /* Kernel tracer channel creation */ |
f3ed775e | 183 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 184 | if (ret < 0) { |
df0f840b | 185 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
186 | goto error; |
187 | } | |
188 | ||
54012638 | 189 | /* Setup the channel fd */ |
20fe2104 | 190 | lkc->fd = ret; |
7b395890 DG |
191 | /* Prevent fd duplication after execlp() */ |
192 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
193 | if (ret < 0) { | |
df0f840b | 194 | PERROR("fcntl session fd"); |
7b395890 DG |
195 | } |
196 | ||
54012638 | 197 | /* Add channel to session */ |
8c0faa1d DG |
198 | cds_list_add(&lkc->list, &session->channel_list.head); |
199 | session->channel_count++; | |
fb5f35b6 | 200 | lkc->session = session; |
e1f3997a | 201 | lkc->key = ++next_kernel_channel_key; |
20fe2104 | 202 | |
e1f3997a JD |
203 | DBG("Kernel channel %s created (fd: %d, key: %" PRIu64 ")", |
204 | lkc->channel->name, lkc->fd, lkc->key); | |
20fe2104 DG |
205 | |
206 | return 0; | |
207 | ||
208 | error: | |
5f62c685 DG |
209 | if (lkc) { |
210 | free(lkc->channel); | |
211 | free(lkc); | |
212 | } | |
54012638 | 213 | return -1; |
20fe2104 | 214 | } |
f34daff7 | 215 | |
410b78a0 FD |
216 | /* |
217 | * Compute the offset of the instrumentation byte in the binary based on the | |
218 | * function probe location using the ELF lookup method. | |
219 | * | |
220 | * Returns 0 on success and set the offset out parameter to the offset of the | |
221 | * elf symbol | |
222 | * Returns -1 on error | |
223 | */ | |
224 | static | |
225 | int extract_userspace_probe_offset_function_elf( | |
87597c2c | 226 | const struct lttng_userspace_probe_location *probe_location, |
410b78a0 FD |
227 | struct ltt_kernel_session *session, uint64_t *offset) |
228 | { | |
229 | int fd; | |
230 | int ret = 0; | |
231 | const char *symbol = NULL; | |
87597c2c | 232 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
410b78a0 FD |
233 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; |
234 | ||
410b78a0 FD |
235 | assert(lttng_userspace_probe_location_get_type(probe_location) == |
236 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); | |
237 | ||
238 | lookup = lttng_userspace_probe_location_get_lookup_method( | |
239 | probe_location); | |
240 | if (!lookup) { | |
241 | ret = -1; | |
242 | goto end; | |
243 | } | |
244 | ||
245 | lookup_method_type = | |
246 | lttng_userspace_probe_location_lookup_method_get_type(lookup); | |
247 | ||
248 | assert(lookup_method_type == | |
249 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF); | |
250 | ||
251 | symbol = lttng_userspace_probe_location_function_get_function_name( | |
252 | probe_location); | |
253 | if (!symbol) { | |
254 | ret = -1; | |
255 | goto end; | |
256 | } | |
257 | ||
258 | fd = lttng_userspace_probe_location_function_get_binary_fd(probe_location); | |
259 | if (fd < 0) { | |
260 | ret = -1; | |
261 | goto end; | |
262 | } | |
263 | ||
264 | ret = run_as_extract_elf_symbol_offset(fd, symbol, session->uid, | |
265 | session->gid, offset); | |
266 | if (ret < 0) { | |
267 | DBG("userspace probe offset calculation failed for " | |
268 | "function %s", symbol); | |
269 | goto end; | |
270 | } | |
271 | ||
272 | DBG("userspace probe elf offset for %s is 0x%jd", symbol, (intmax_t)(*offset)); | |
273 | end: | |
274 | return ret; | |
275 | } | |
276 | ||
277 | /* | |
278 | * Compute the offsets of the instrumentation bytes in the binary based on the | |
279 | * tracepoint probe location using the SDT lookup method. This function | |
280 | * allocates the offsets buffer, the caller must free it. | |
281 | * | |
282 | * Returns 0 on success and set the offset out parameter to the offsets of the | |
283 | * SDT tracepoint. | |
284 | * Returns -1 on error. | |
285 | */ | |
286 | static | |
287 | int extract_userspace_probe_offset_tracepoint_sdt( | |
87597c2c | 288 | const struct lttng_userspace_probe_location *probe_location, |
410b78a0 FD |
289 | struct ltt_kernel_session *session, uint64_t **offsets, |
290 | uint32_t *offsets_count) | |
291 | { | |
292 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; | |
87597c2c | 293 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
410b78a0 FD |
294 | const char *probe_name = NULL, *provider_name = NULL; |
295 | int ret = 0; | |
296 | int fd, i; | |
297 | ||
298 | assert(lttng_userspace_probe_location_get_type(probe_location) == | |
299 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT); | |
300 | ||
301 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
302 | if (!lookup) { | |
303 | ret = -1; | |
304 | goto end; | |
305 | } | |
306 | ||
307 | lookup_method_type = | |
308 | lttng_userspace_probe_location_lookup_method_get_type(lookup); | |
309 | ||
310 | assert(lookup_method_type == | |
311 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT); | |
312 | ||
313 | ||
314 | probe_name = lttng_userspace_probe_location_tracepoint_get_probe_name( | |
315 | probe_location); | |
316 | if (!probe_name) { | |
317 | ret = -1; | |
318 | goto end; | |
319 | } | |
320 | ||
321 | provider_name = lttng_userspace_probe_location_tracepoint_get_provider_name( | |
322 | probe_location); | |
323 | if (!provider_name) { | |
324 | ret = -1; | |
325 | goto end; | |
326 | } | |
327 | ||
328 | fd = lttng_userspace_probe_location_tracepoint_get_binary_fd(probe_location); | |
329 | if (fd < 0) { | |
330 | ret = -1; | |
331 | goto end; | |
332 | } | |
333 | ||
334 | ret = run_as_extract_sdt_probe_offsets(fd, provider_name, probe_name, | |
335 | session->uid, session->gid, offsets, offsets_count); | |
336 | if (ret < 0) { | |
337 | DBG("userspace probe offset calculation failed for sdt " | |
338 | "probe %s:%s", provider_name, probe_name); | |
339 | goto end; | |
340 | } | |
341 | ||
342 | if (*offsets_count == 0) { | |
343 | DBG("no userspace probe offset found"); | |
344 | goto end; | |
345 | } | |
346 | ||
347 | DBG("%u userspace probe SDT offsets found for %s:%s at:", | |
348 | *offsets_count, provider_name, probe_name); | |
349 | for (i = 0; i < *offsets_count; i++) { | |
350 | DBG("\t0x%jd", (intmax_t)((*offsets)[i])); | |
351 | } | |
352 | end: | |
353 | return ret; | |
354 | } | |
355 | ||
356 | /* | |
357 | * Extract the offsets of the instrumentation point for the different lookup | |
358 | * methods. | |
359 | */ | |
360 | static | |
361 | int userspace_probe_add_callsites(struct lttng_event *ev, | |
362 | struct ltt_kernel_session *session, int fd) | |
363 | { | |
87597c2c | 364 | const struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL; |
410b78a0 | 365 | enum lttng_userspace_probe_location_lookup_method_type type; |
87597c2c | 366 | const struct lttng_userspace_probe_location *location = NULL; |
410b78a0 FD |
367 | int ret; |
368 | ||
369 | assert(ev); | |
370 | assert(ev->type == LTTNG_EVENT_USERSPACE_PROBE); | |
371 | ||
372 | location = lttng_event_get_userspace_probe_location(ev); | |
373 | if (!location) { | |
374 | ret = -1; | |
375 | goto end; | |
376 | } | |
377 | lookup_method = | |
378 | lttng_userspace_probe_location_get_lookup_method(location); | |
379 | if (!lookup_method) { | |
380 | ret = -1; | |
381 | goto end; | |
382 | } | |
383 | ||
384 | type = lttng_userspace_probe_location_lookup_method_get_type(lookup_method); | |
385 | switch (type) { | |
386 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
387 | { | |
388 | struct lttng_kernel_event_callsite callsite; | |
389 | uint64_t offset; | |
390 | ||
391 | ret = extract_userspace_probe_offset_function_elf(location, session, &offset); | |
392 | if (ret) { | |
393 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
394 | goto end; | |
395 | } | |
396 | ||
397 | callsite.u.uprobe.offset = offset; | |
398 | ret = kernctl_add_callsite(fd, &callsite); | |
399 | if (ret) { | |
400 | WARN("Adding callsite to userspace probe " | |
401 | "event %s failed.", ev->name); | |
402 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
403 | goto end; | |
404 | } | |
405 | break; | |
406 | } | |
407 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
408 | { | |
409 | int i; | |
410 | uint64_t *offsets = NULL; | |
411 | uint32_t offsets_count; | |
412 | struct lttng_kernel_event_callsite callsite; | |
413 | ||
414 | /* | |
415 | * This call allocates the offsets buffer. This buffer must be freed | |
416 | * by the caller | |
417 | */ | |
418 | ret = extract_userspace_probe_offset_tracepoint_sdt(location, session, | |
419 | &offsets, &offsets_count); | |
420 | if (ret) { | |
421 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
422 | goto end; | |
423 | } | |
424 | for (i = 0; i < offsets_count; i++) { | |
425 | callsite.u.uprobe.offset = offsets[i]; | |
426 | ret = kernctl_add_callsite(fd, &callsite); | |
427 | if (ret) { | |
428 | WARN("Adding callsite to userspace probe " | |
429 | "event %s failed.", ev->name); | |
430 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
431 | free(offsets); | |
432 | goto end; | |
433 | } | |
434 | } | |
435 | free(offsets); | |
436 | break; | |
437 | } | |
438 | default: | |
439 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
440 | goto end; | |
441 | } | |
442 | end: | |
443 | return ret; | |
444 | } | |
445 | ||
f34daff7 | 446 | /* |
050349bb DG |
447 | * Create a kernel event, enable it to the kernel tracer and add it to the |
448 | * channel event list of the kernel session. | |
49d21f93 | 449 | * We own filter_expression and filter. |
f34daff7 | 450 | */ |
050349bb | 451 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
452 | struct ltt_kernel_channel *channel, |
453 | char *filter_expression, | |
454 | struct lttng_filter_bytecode *filter) | |
f34daff7 | 455 | { |
71a3bb01 FD |
456 | int err, fd; |
457 | enum lttng_error_code ret; | |
f34daff7 | 458 | struct ltt_kernel_event *event; |
f34daff7 | 459 | |
0525e9ae DG |
460 | assert(ev); |
461 | assert(channel); | |
462 | ||
a969e101 | 463 | /* We pass ownership of filter_expression and filter */ |
71a3bb01 FD |
464 | ret = trace_kernel_create_event(ev, filter_expression, |
465 | filter, &event); | |
466 | if (ret != LTTNG_OK) { | |
f34daff7 DG |
467 | goto error; |
468 | } | |
469 | ||
71a3bb01 FD |
470 | fd = kernctl_create_event(channel->fd, event->event); |
471 | if (fd < 0) { | |
472 | switch (-fd) { | |
bd29c13d | 473 | case EEXIST: |
71a3bb01 | 474 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
bd29c13d DG |
475 | break; |
476 | case ENOSYS: | |
477 | WARN("Event type not implemented"); | |
71a3bb01 | 478 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
bd29c13d | 479 | break; |
8197a339 DG |
480 | case ENOENT: |
481 | WARN("Event %s not found!", ev->name); | |
71a3bb01 | 482 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
8197a339 | 483 | break; |
bd29c13d | 484 | default: |
71a3bb01 | 485 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
d87bfb32 DG |
486 | PERROR("create event ioctl"); |
487 | } | |
e953ef25 | 488 | goto free_event; |
8c0faa1d | 489 | } |
f34daff7 | 490 | |
d0ae4ea8 | 491 | event->type = ev->type; |
71a3bb01 | 492 | event->fd = fd; |
7b395890 | 493 | /* Prevent fd duplication after execlp() */ |
71a3bb01 FD |
494 | err = fcntl(event->fd, F_SETFD, FD_CLOEXEC); |
495 | if (err < 0) { | |
df0f840b | 496 | PERROR("fcntl session fd"); |
7b395890 DG |
497 | } |
498 | ||
00a62084 | 499 | if (filter) { |
71a3bb01 FD |
500 | err = kernctl_filter(event->fd, filter); |
501 | if (err < 0) { | |
502 | switch (-err) { | |
503 | case ENOMEM: | |
504 | ret = LTTNG_ERR_FILTER_NOMEM; | |
505 | break; | |
506 | default: | |
507 | ret = LTTNG_ERR_FILTER_INVAL; | |
508 | break; | |
509 | } | |
00a62084 MD |
510 | goto filter_error; |
511 | } | |
512 | } | |
513 | ||
dcabc190 FD |
514 | if (ev->type == LTTNG_EVENT_USERSPACE_PROBE) { |
515 | ret = userspace_probe_add_callsites(ev, channel->session, event->fd); | |
516 | if (ret) { | |
517 | goto add_callsite_error; | |
518 | } | |
519 | } | |
520 | ||
71a3bb01 FD |
521 | err = kernctl_enable(event->fd); |
522 | if (err < 0) { | |
523 | switch (-err) { | |
00a62084 MD |
524 | case EEXIST: |
525 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
526 | break; | |
527 | default: | |
528 | PERROR("enable kernel event"); | |
71a3bb01 | 529 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
00a62084 MD |
530 | break; |
531 | } | |
532 | goto enable_error; | |
533 | } | |
534 | ||
f3ed775e DG |
535 | /* Add event to event list */ |
536 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
537 | channel->event_count++; |
538 | ||
e953ef25 DG |
539 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
540 | ||
541 | return 0; | |
542 | ||
dcabc190 | 543 | add_callsite_error: |
00a62084 MD |
544 | enable_error: |
545 | filter_error: | |
546 | { | |
547 | int closeret; | |
548 | ||
549 | closeret = close(event->fd); | |
550 | if (closeret) { | |
551 | PERROR("close event fd"); | |
552 | } | |
553 | } | |
e953ef25 DG |
554 | free_event: |
555 | free(event); | |
556 | error: | |
d87bfb32 | 557 | return ret; |
e953ef25 DG |
558 | } |
559 | ||
26cc6b4e | 560 | /* |
050349bb | 561 | * Disable a kernel channel. |
26cc6b4e DG |
562 | */ |
563 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
564 | { | |
565 | int ret; | |
566 | ||
0525e9ae DG |
567 | assert(chan); |
568 | ||
26cc6b4e DG |
569 | ret = kernctl_disable(chan->fd); |
570 | if (ret < 0) { | |
df0f840b | 571 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
572 | goto error; |
573 | } | |
574 | ||
575 | chan->enabled = 0; | |
e1f3997a JD |
576 | DBG("Kernel channel %s disabled (fd: %d, key: %" PRIu64 ")", |
577 | chan->channel->name, chan->fd, chan->key); | |
26cc6b4e DG |
578 | |
579 | return 0; | |
580 | ||
581 | error: | |
582 | return ret; | |
583 | } | |
584 | ||
d36b8583 | 585 | /* |
050349bb | 586 | * Enable a kernel channel. |
d36b8583 DG |
587 | */ |
588 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
589 | { | |
590 | int ret; | |
591 | ||
0525e9ae DG |
592 | assert(chan); |
593 | ||
d36b8583 | 594 | ret = kernctl_enable(chan->fd); |
32af2c95 | 595 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 596 | PERROR("Enable kernel chan"); |
d36b8583 DG |
597 | goto error; |
598 | } | |
599 | ||
600 | chan->enabled = 1; | |
e1f3997a JD |
601 | DBG("Kernel channel %s enabled (fd: %d, key: %" PRIu64 ")", |
602 | chan->channel->name, chan->fd, chan->key); | |
d36b8583 DG |
603 | |
604 | return 0; | |
605 | ||
606 | error: | |
607 | return ret; | |
608 | } | |
609 | ||
19e70852 | 610 | /* |
050349bb | 611 | * Enable a kernel event. |
19e70852 DG |
612 | */ |
613 | int kernel_enable_event(struct ltt_kernel_event *event) | |
614 | { | |
615 | int ret; | |
616 | ||
0525e9ae DG |
617 | assert(event); |
618 | ||
19e70852 | 619 | ret = kernctl_enable(event->fd); |
42224349 | 620 | if (ret < 0) { |
32af2c95 | 621 | switch (-ret) { |
42224349 | 622 | case EEXIST: |
f73fabfd | 623 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
624 | break; |
625 | default: | |
626 | PERROR("enable kernel event"); | |
627 | break; | |
628 | } | |
19e70852 DG |
629 | goto error; |
630 | } | |
631 | ||
632 | event->enabled = 1; | |
633 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
634 | ||
635 | return 0; | |
636 | ||
637 | error: | |
d36b8583 | 638 | return ret; |
19e70852 DG |
639 | } |
640 | ||
e953ef25 | 641 | /* |
050349bb | 642 | * Disable a kernel event. |
e953ef25 | 643 | */ |
19e70852 | 644 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
645 | { |
646 | int ret; | |
19e70852 | 647 | |
0525e9ae DG |
648 | assert(event); |
649 | ||
19e70852 | 650 | ret = kernctl_disable(event->fd); |
42224349 | 651 | if (ret < 0) { |
32af2c95 | 652 | switch (-ret) { |
42224349 | 653 | case EEXIST: |
f73fabfd | 654 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
655 | break; |
656 | default: | |
657 | PERROR("disable kernel event"); | |
658 | break; | |
659 | } | |
19e70852 | 660 | goto error; |
e953ef25 | 661 | } |
f3ed775e | 662 | |
19e70852 DG |
663 | event->enabled = 0; |
664 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
665 | ||
f34daff7 DG |
666 | return 0; |
667 | ||
668 | error: | |
d36b8583 | 669 | return ret; |
f34daff7 | 670 | } |
aaf26714 | 671 | |
6e911cad | 672 | |
ccf10263 MD |
673 | int kernel_track_pid(struct ltt_kernel_session *session, int pid) |
674 | { | |
7c493d31 MD |
675 | int ret; |
676 | ||
ccf10263 MD |
677 | DBG("Kernel track PID %d for session id %" PRIu64 ".", |
678 | pid, session->id); | |
7c493d31 MD |
679 | ret = kernctl_track_pid(session->fd, pid); |
680 | if (!ret) { | |
681 | return LTTNG_OK; | |
682 | } | |
32af2c95 | 683 | switch (-ret) { |
7c493d31 MD |
684 | case EINVAL: |
685 | return LTTNG_ERR_INVALID; | |
686 | case ENOMEM: | |
687 | return LTTNG_ERR_NOMEM; | |
688 | case EEXIST: | |
689 | return LTTNG_ERR_PID_TRACKED; | |
690 | default: | |
691 | return LTTNG_ERR_UNK; | |
692 | } | |
ccf10263 MD |
693 | } |
694 | ||
695 | int kernel_untrack_pid(struct ltt_kernel_session *session, int pid) | |
696 | { | |
7c493d31 MD |
697 | int ret; |
698 | ||
ccf10263 MD |
699 | DBG("Kernel untrack PID %d for session id %" PRIu64 ".", |
700 | pid, session->id); | |
7c493d31 MD |
701 | ret = kernctl_untrack_pid(session->fd, pid); |
702 | if (!ret) { | |
703 | return LTTNG_OK; | |
704 | } | |
32af2c95 | 705 | switch (-ret) { |
7c493d31 MD |
706 | case EINVAL: |
707 | return LTTNG_ERR_INVALID; | |
708 | case ENOMEM: | |
709 | return LTTNG_ERR_NOMEM; | |
710 | case ENOENT: | |
711 | return LTTNG_ERR_PID_NOT_TRACKED; | |
712 | default: | |
713 | return LTTNG_ERR_UNK; | |
714 | } | |
ccf10263 MD |
715 | } |
716 | ||
a5dfbb9d MD |
717 | ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session, |
718 | int **_pids) | |
719 | { | |
720 | int fd, ret; | |
721 | int pid; | |
722 | ssize_t nbmem, count = 0; | |
723 | FILE *fp; | |
724 | int *pids; | |
725 | ||
726 | fd = kernctl_list_tracker_pids(session->fd); | |
727 | if (fd < 0) { | |
728 | PERROR("kernel tracker pids list"); | |
729 | goto error; | |
730 | } | |
731 | ||
732 | fp = fdopen(fd, "r"); | |
733 | if (fp == NULL) { | |
734 | PERROR("kernel tracker pids list fdopen"); | |
735 | goto error_fp; | |
736 | } | |
737 | ||
738 | nbmem = KERNEL_TRACKER_PIDS_INIT_LIST_SIZE; | |
739 | pids = zmalloc(sizeof(*pids) * nbmem); | |
740 | if (pids == NULL) { | |
741 | PERROR("alloc list pids"); | |
742 | count = -ENOMEM; | |
743 | goto end; | |
744 | } | |
745 | ||
746 | while (fscanf(fp, "process { pid = %u; };\n", &pid) == 1) { | |
747 | if (count >= nbmem) { | |
748 | int *new_pids; | |
749 | size_t new_nbmem; | |
750 | ||
751 | new_nbmem = nbmem << 1; | |
752 | DBG("Reallocating pids list from %zu to %zu entries", | |
753 | nbmem, new_nbmem); | |
754 | new_pids = realloc(pids, new_nbmem * sizeof(*new_pids)); | |
755 | if (new_pids == NULL) { | |
756 | PERROR("realloc list events"); | |
757 | free(pids); | |
758 | count = -ENOMEM; | |
759 | goto end; | |
760 | } | |
761 | /* Zero the new memory */ | |
762 | memset(new_pids + nbmem, 0, | |
763 | (new_nbmem - nbmem) * sizeof(*new_pids)); | |
764 | nbmem = new_nbmem; | |
765 | pids = new_pids; | |
766 | } | |
767 | pids[count++] = pid; | |
768 | } | |
769 | ||
770 | *_pids = pids; | |
771 | DBG("Kernel list tracker pids done (%zd pids)", count); | |
772 | end: | |
773 | ret = fclose(fp); /* closes both fp and fd */ | |
774 | if (ret) { | |
775 | PERROR("fclose"); | |
776 | } | |
777 | return count; | |
778 | ||
779 | error_fp: | |
780 | ret = close(fd); | |
781 | if (ret) { | |
782 | PERROR("close"); | |
783 | } | |
784 | error: | |
785 | return -1; | |
786 | } | |
787 | ||
aaf26714 | 788 | /* |
050349bb DG |
789 | * Create kernel metadata, open from the kernel tracer and add it to the |
790 | * kernel session. | |
aaf26714 | 791 | */ |
a4b92340 | 792 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
793 | { |
794 | int ret; | |
74024a21 | 795 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 796 | |
0525e9ae DG |
797 | assert(session); |
798 | ||
54012638 | 799 | /* Allocate kernel metadata */ |
a4b92340 | 800 | lkm = trace_kernel_create_metadata(); |
54012638 | 801 | if (lkm == NULL) { |
aaf26714 DG |
802 | goto error; |
803 | } | |
804 | ||
54012638 | 805 | /* Kernel tracer metadata creation */ |
f3ed775e | 806 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 807 | if (ret < 0) { |
74024a21 | 808 | goto error_open; |
aaf26714 DG |
809 | } |
810 | ||
8c0faa1d | 811 | lkm->fd = ret; |
d40f0359 | 812 | lkm->key = ++next_kernel_channel_key; |
7b395890 DG |
813 | /* Prevent fd duplication after execlp() */ |
814 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
815 | if (ret < 0) { | |
df0f840b | 816 | PERROR("fcntl session fd"); |
7b395890 DG |
817 | } |
818 | ||
aaf26714 | 819 | session->metadata = lkm; |
8c0faa1d | 820 | |
00e2e675 | 821 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
822 | |
823 | return 0; | |
824 | ||
74024a21 DG |
825 | error_open: |
826 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 827 | error: |
54012638 | 828 | return -1; |
8c0faa1d DG |
829 | } |
830 | ||
831 | /* | |
050349bb | 832 | * Start tracing session. |
8c0faa1d DG |
833 | */ |
834 | int kernel_start_session(struct ltt_kernel_session *session) | |
835 | { | |
836 | int ret; | |
837 | ||
0525e9ae DG |
838 | assert(session); |
839 | ||
8c0faa1d DG |
840 | ret = kernctl_start_session(session->fd); |
841 | if (ret < 0) { | |
df0f840b | 842 | PERROR("ioctl start session"); |
8c0faa1d DG |
843 | goto error; |
844 | } | |
845 | ||
846 | DBG("Kernel session started"); | |
847 | ||
848 | return 0; | |
849 | ||
850 | error: | |
851 | return ret; | |
852 | } | |
853 | ||
f3ed775e | 854 | /* |
050349bb | 855 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
856 | */ |
857 | void kernel_wait_quiescent(int fd) | |
858 | { | |
859 | int ret; | |
860 | ||
861 | DBG("Kernel quiescent wait on %d", fd); | |
862 | ||
863 | ret = kernctl_wait_quiescent(fd); | |
864 | if (ret < 0) { | |
df0f840b | 865 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
866 | ERR("Kernel quiescent wait failed"); |
867 | } | |
868 | } | |
869 | ||
870 | /* | |
f3ed775e DG |
871 | * Force flush buffer of metadata. |
872 | */ | |
873 | int kernel_metadata_flush_buffer(int fd) | |
874 | { | |
875 | int ret; | |
876 | ||
169d2cb7 DG |
877 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
878 | ||
f3ed775e DG |
879 | ret = kernctl_buffer_flush(fd); |
880 | if (ret < 0) { | |
00e2e675 | 881 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
882 | } |
883 | ||
884 | return 0; | |
885 | } | |
886 | ||
887 | /* | |
050349bb | 888 | * Force flush buffer for channel. |
f3ed775e DG |
889 | */ |
890 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
891 | { | |
892 | int ret; | |
893 | struct ltt_kernel_stream *stream; | |
894 | ||
0525e9ae DG |
895 | assert(channel); |
896 | ||
f3ed775e DG |
897 | DBG("Flush buffer for channel %s", channel->channel->name); |
898 | ||
899 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
900 | DBG("Flushing channel stream %d", stream->fd); | |
901 | ret = kernctl_buffer_flush(stream->fd); | |
902 | if (ret < 0) { | |
df0f840b | 903 | PERROR("ioctl"); |
f3ed775e DG |
904 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
905 | stream->fd, ret); | |
906 | } | |
907 | } | |
908 | ||
909 | return 0; | |
910 | } | |
911 | ||
8c0faa1d | 912 | /* |
050349bb | 913 | * Stop tracing session. |
8c0faa1d DG |
914 | */ |
915 | int kernel_stop_session(struct ltt_kernel_session *session) | |
916 | { | |
917 | int ret; | |
918 | ||
0525e9ae DG |
919 | assert(session); |
920 | ||
8c0faa1d DG |
921 | ret = kernctl_stop_session(session->fd); |
922 | if (ret < 0) { | |
923 | goto error; | |
924 | } | |
925 | ||
926 | DBG("Kernel session stopped"); | |
927 | ||
928 | return 0; | |
929 | ||
930 | error: | |
931 | return ret; | |
932 | } | |
933 | ||
934 | /* | |
050349bb DG |
935 | * Open stream of channel, register it to the kernel tracer and add it |
936 | * to the stream list of the channel. | |
8c0faa1d | 937 | * |
1cfb4b98 MD |
938 | * Note: given that the streams may appear in random order wrt CPU |
939 | * number (e.g. cpu hotplug), the index value of the stream number in | |
940 | * the stream name is not necessarily linked to the CPU number. | |
941 | * | |
050349bb | 942 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 943 | */ |
f3ed775e | 944 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 945 | { |
1cfb4b98 | 946 | int ret; |
8c0faa1d DG |
947 | struct ltt_kernel_stream *lks; |
948 | ||
0525e9ae DG |
949 | assert(channel); |
950 | ||
5a47c6a2 | 951 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
1cfb4b98 MD |
952 | lks = trace_kernel_create_stream(channel->channel->name, |
953 | channel->stream_count); | |
8c0faa1d | 954 | if (lks == NULL) { |
799e2c4f MD |
955 | ret = close(ret); |
956 | if (ret) { | |
957 | PERROR("close"); | |
958 | } | |
8c0faa1d DG |
959 | goto error; |
960 | } | |
961 | ||
962 | lks->fd = ret; | |
7b395890 DG |
963 | /* Prevent fd duplication after execlp() */ |
964 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
965 | if (ret < 0) { | |
df0f840b | 966 | PERROR("fcntl session fd"); |
7b395890 DG |
967 | } |
968 | ||
1624d5b7 JD |
969 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
970 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
971 | ||
1cfb4b98 | 972 | /* Add stream to channel stream list */ |
8c0faa1d DG |
973 | cds_list_add(&lks->list, &channel->stream_list.head); |
974 | channel->stream_count++; | |
8c0faa1d | 975 | |
00e2e675 DG |
976 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, |
977 | lks->state); | |
54012638 | 978 | } |
8c0faa1d DG |
979 | |
980 | return channel->stream_count; | |
981 | ||
982 | error: | |
54012638 | 983 | return -1; |
8c0faa1d DG |
984 | } |
985 | ||
986 | /* | |
050349bb | 987 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 988 | */ |
f3ed775e | 989 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
990 | { |
991 | int ret; | |
992 | ||
0525e9ae DG |
993 | assert(session); |
994 | ||
8c0faa1d DG |
995 | ret = kernctl_create_stream(session->metadata->fd); |
996 | if (ret < 0) { | |
df0f840b | 997 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
998 | goto error; |
999 | } | |
1000 | ||
1001 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
1002 | session->metadata_stream_fd = ret; | |
7b395890 DG |
1003 | /* Prevent fd duplication after execlp() */ |
1004 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
1005 | if (ret < 0) { | |
df0f840b | 1006 | PERROR("fcntl session fd"); |
7b395890 | 1007 | } |
aaf26714 DG |
1008 | |
1009 | return 0; | |
1010 | ||
1011 | error: | |
54012638 | 1012 | return -1; |
aaf26714 | 1013 | } |
2ef84c95 DG |
1014 | |
1015 | /* | |
9f19cc17 | 1016 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 1017 | */ |
9f19cc17 | 1018 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 1019 | { |
53efb85a | 1020 | int fd, ret; |
9f19cc17 DG |
1021 | char *event; |
1022 | size_t nbmem, count = 0; | |
2ef84c95 | 1023 | FILE *fp; |
9f19cc17 | 1024 | struct lttng_event *elist; |
2ef84c95 | 1025 | |
0525e9ae DG |
1026 | assert(events); |
1027 | ||
2ef84c95 DG |
1028 | fd = kernctl_tracepoint_list(tracer_fd); |
1029 | if (fd < 0) { | |
df0f840b | 1030 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
1031 | goto error; |
1032 | } | |
1033 | ||
1034 | fp = fdopen(fd, "r"); | |
1035 | if (fp == NULL) { | |
df0f840b | 1036 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 1037 | goto error_fp; |
2ef84c95 DG |
1038 | } |
1039 | ||
1040 | /* | |
1041 | * Init memory size counter | |
1042 | * See kernel-ctl.h for explanation of this value | |
1043 | */ | |
6725fe19 | 1044 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 1045 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
1046 | if (elist == NULL) { |
1047 | PERROR("alloc list events"); | |
1048 | count = -ENOMEM; | |
1049 | goto end; | |
1050 | } | |
2ef84c95 | 1051 | |
53efb85a | 1052 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 1053 | if (count >= nbmem) { |
3b870559 | 1054 | struct lttng_event *new_elist; |
53efb85a | 1055 | size_t new_nbmem; |
3b870559 | 1056 | |
53efb85a MD |
1057 | new_nbmem = nbmem << 1; |
1058 | DBG("Reallocating event list from %zu to %zu bytes", | |
1059 | nbmem, new_nbmem); | |
1060 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 1061 | if (new_elist == NULL) { |
df0f840b | 1062 | PERROR("realloc list events"); |
3b870559 MD |
1063 | free(event); |
1064 | free(elist); | |
61b73b12 MD |
1065 | count = -ENOMEM; |
1066 | goto end; | |
2ef84c95 | 1067 | } |
53efb85a MD |
1068 | /* Zero the new memory */ |
1069 | memset(new_elist + nbmem, 0, | |
1070 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
1071 | nbmem = new_nbmem; | |
3b870559 | 1072 | elist = new_elist; |
2ef84c95 | 1073 | } |
99497cd0 MD |
1074 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
1075 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 1076 | elist[count].enabled = -1; |
9f19cc17 | 1077 | count++; |
3b870559 | 1078 | free(event); |
2ef84c95 DG |
1079 | } |
1080 | ||
9f19cc17 | 1081 | *events = elist; |
ced2f820 | 1082 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 1083 | end: |
799e2c4f MD |
1084 | ret = fclose(fp); /* closes both fp and fd */ |
1085 | if (ret) { | |
1086 | PERROR("fclose"); | |
1087 | } | |
9f19cc17 | 1088 | return count; |
2ef84c95 | 1089 | |
61b73b12 | 1090 | error_fp: |
799e2c4f MD |
1091 | ret = close(fd); |
1092 | if (ret) { | |
1093 | PERROR("close"); | |
1094 | } | |
2ef84c95 DG |
1095 | error: |
1096 | return -1; | |
1097 | } | |
096102bd DG |
1098 | |
1099 | /* | |
1100 | * Get kernel version and validate it. | |
1101 | */ | |
88076e89 JD |
1102 | int kernel_validate_version(int tracer_fd, |
1103 | struct lttng_kernel_tracer_version *version, | |
1104 | struct lttng_kernel_tracer_abi_version *abi_version) | |
096102bd DG |
1105 | { |
1106 | int ret; | |
096102bd | 1107 | |
88076e89 | 1108 | ret = kernctl_tracer_version(tracer_fd, version); |
096102bd | 1109 | if (ret < 0) { |
521dd134 | 1110 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
1111 | goto error; |
1112 | } | |
1113 | ||
1114 | /* Validate version */ | |
88076e89 | 1115 | if (version->major != VERSION_MAJOR) { |
c052142c | 1116 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", |
88076e89 | 1117 | version->major, VERSION_MAJOR); |
096102bd | 1118 | goto error_version; |
096102bd | 1119 | } |
88076e89 | 1120 | ret = kernctl_tracer_abi_version(tracer_fd, abi_version); |
c052142c | 1121 | if (ret < 0) { |
521dd134 | 1122 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
1123 | goto error; |
1124 | } | |
88076e89 | 1125 | if (abi_version->major != LTTNG_MODULES_ABI_MAJOR_VERSION) { |
521dd134 | 1126 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
88076e89 | 1127 | abi_version->major, abi_version->minor, |
c052142c MD |
1128 | LTTNG_MODULES_ABI_MAJOR_VERSION); |
1129 | goto error; | |
1130 | } | |
1131 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
88076e89 JD |
1132 | version->major, version->minor, |
1133 | abi_version->major, abi_version->minor); | |
096102bd DG |
1134 | return 0; |
1135 | ||
1136 | error_version: | |
096102bd DG |
1137 | ret = -1; |
1138 | ||
1139 | error: | |
521dd134 | 1140 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
1141 | return ret; |
1142 | } | |
335a95b7 MD |
1143 | |
1144 | /* | |
1145 | * Kernel work-arounds called at the start of sessiond main(). | |
1146 | */ | |
1147 | int init_kernel_workarounds(void) | |
1148 | { | |
8936c33a | 1149 | int ret; |
335a95b7 MD |
1150 | FILE *fp; |
1151 | ||
1152 | /* | |
1153 | * boot_id needs to be read once before being used concurrently | |
1154 | * to deal with a Linux kernel race. A fix is proposed for | |
1155 | * upstream, but the work-around is needed for older kernels. | |
1156 | */ | |
1157 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
1158 | if (!fp) { | |
1159 | goto end_boot_id; | |
1160 | } | |
1161 | while (!feof(fp)) { | |
1162 | char buf[37] = ""; | |
1163 | ||
8936c33a DG |
1164 | ret = fread(buf, 1, sizeof(buf), fp); |
1165 | if (ret < 0) { | |
1166 | /* Ignore error, we don't really care */ | |
1167 | } | |
335a95b7 | 1168 | } |
799e2c4f MD |
1169 | ret = fclose(fp); |
1170 | if (ret) { | |
1171 | PERROR("fclose"); | |
1172 | } | |
335a95b7 | 1173 | end_boot_id: |
335a95b7 MD |
1174 | return 0; |
1175 | } | |
2f77fc4b DG |
1176 | |
1177 | /* | |
1178 | * Complete teardown of a kernel session. | |
1179 | */ | |
1180 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
1181 | { | |
1182 | if (ksess == NULL) { | |
1183 | DBG3("No kernel session when tearing down session"); | |
1184 | return; | |
1185 | } | |
1186 | ||
1187 | DBG("Tearing down kernel session"); | |
1188 | ||
07b86b52 | 1189 | /* |
15dc512a DG |
1190 | * Destroy channels on the consumer if at least one FD has been sent and we |
1191 | * are in no output mode because the streams are in *no* monitor mode so we | |
1192 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 1193 | */ |
15dc512a | 1194 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
1195 | int ret; |
1196 | struct consumer_socket *socket; | |
1197 | struct lttng_ht_iter iter; | |
1198 | ||
1199 | /* For each consumer socket. */ | |
d069d577 | 1200 | rcu_read_lock(); |
07b86b52 JD |
1201 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
1202 | socket, node.node) { | |
1203 | struct ltt_kernel_channel *chan; | |
1204 | ||
1205 | /* For each channel, ask the consumer to destroy it. */ | |
1206 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
1207 | ret = kernel_consumer_destroy_channel(socket, chan); | |
1208 | if (ret < 0) { | |
1209 | /* Consumer is probably dead. Use next socket. */ | |
1210 | continue; | |
1211 | } | |
1212 | } | |
1213 | } | |
d069d577 | 1214 | rcu_read_unlock(); |
07b86b52 JD |
1215 | } |
1216 | ||
2f77fc4b DG |
1217 | /* Close any relayd session */ |
1218 | consumer_output_send_destroy_relayd(ksess->consumer); | |
1219 | ||
1220 | trace_kernel_destroy_session(ksess); | |
1221 | } | |
fb5f35b6 DG |
1222 | |
1223 | /* | |
1224 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
1225 | */ | |
1226 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
1227 | { | |
1228 | struct ltt_kernel_session *ksess = NULL; | |
1229 | ||
1230 | assert(kchan); | |
1231 | assert(kchan->channel); | |
1232 | ||
1233 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
1234 | ||
1235 | /* Update channel count of associated session. */ | |
1236 | if (kchan->session) { | |
1237 | /* Keep pointer reference so we can update it after the destroy. */ | |
1238 | ksess = kchan->session; | |
1239 | } | |
1240 | ||
1241 | trace_kernel_destroy_channel(kchan); | |
1242 | ||
1243 | /* | |
1244 | * At this point the kernel channel is not visible anymore. This is safe | |
1245 | * since in order to work on a visible kernel session, the tracing session | |
1246 | * lock (ltt_session.lock) MUST be acquired. | |
1247 | */ | |
1248 | if (ksess) { | |
1249 | ksess->channel_count--; | |
1250 | } | |
1251 | } | |
6dc3064a DG |
1252 | |
1253 | /* | |
1254 | * Take a snapshot for a given kernel session. | |
1255 | * | |
9a654598 | 1256 | * Return LTTNG_OK on success or else return a LTTNG_ERR code. |
6dc3064a | 1257 | */ |
9a654598 | 1258 | enum lttng_error_code kernel_snapshot_record(struct ltt_kernel_session *ksess, |
d07ceecd MD |
1259 | struct snapshot_output *output, int wait, |
1260 | uint64_t nb_packets_per_stream) | |
6dc3064a | 1261 | { |
2a06df8d | 1262 | int err, ret, saved_metadata_fd; |
9a654598 | 1263 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
1264 | struct consumer_socket *socket; |
1265 | struct lttng_ht_iter iter; | |
1266 | struct ltt_kernel_metadata *saved_metadata; | |
e32d7f27 | 1267 | struct ltt_session *session = NULL; |
e098433c | 1268 | uint64_t trace_archive_id; |
6dc3064a DG |
1269 | |
1270 | assert(ksess); | |
1271 | assert(ksess->consumer); | |
1272 | assert(output); | |
1273 | ||
1274 | DBG("Kernel snapshot record started"); | |
1275 | ||
e098433c JG |
1276 | session = session_find_by_id(ksess->id); |
1277 | assert(session); | |
1278 | assert(pthread_mutex_trylock(&session->lock)); | |
1279 | assert(session_trylock_list()); | |
1280 | trace_archive_id = session->current_archive_id; | |
1281 | ||
6dc3064a DG |
1282 | /* Save current metadata since the following calls will change it. */ |
1283 | saved_metadata = ksess->metadata; | |
1284 | saved_metadata_fd = ksess->metadata_stream_fd; | |
1285 | ||
1286 | rcu_read_lock(); | |
1287 | ||
1288 | ret = kernel_open_metadata(ksess); | |
1289 | if (ret < 0) { | |
9a654598 | 1290 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1291 | goto error; |
1292 | } | |
1293 | ||
1294 | ret = kernel_open_metadata_stream(ksess); | |
1295 | if (ret < 0) { | |
9a654598 | 1296 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1297 | goto error_open_stream; |
1298 | } | |
1299 | ||
1300 | /* Send metadata to consumer and snapshot everything. */ | |
1301 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1302 | socket, node.node) { | |
1303 | struct consumer_output *saved_output; | |
1304 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
1305 | |
1306 | /* | |
1307 | * Temporarly switch consumer output for our snapshot output. As long | |
1308 | * as the session lock is taken, this is safe. | |
1309 | */ | |
1310 | saved_output = ksess->consumer; | |
1311 | ksess->consumer = output->consumer; | |
1312 | ||
1313 | pthread_mutex_lock(socket->lock); | |
1314 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1315 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1316 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 1317 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
1318 | ksess->consumer = saved_output; |
1319 | if (ret < 0) { | |
0ed78e50 | 1320 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1321 | goto error_consumer; |
1322 | } | |
1323 | ||
1324 | /* For each channel, ask the consumer to snapshot it. */ | |
1325 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
9a654598 | 1326 | status = consumer_snapshot_channel(socket, chan->key, output, 0, |
5c786ded JD |
1327 | ksess->uid, ksess->gid, |
1328 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
e098433c JG |
1329 | nb_packets_per_stream, |
1330 | trace_archive_id); | |
9a654598 | 1331 | if (status != LTTNG_OK) { |
2a06df8d DG |
1332 | (void) kernel_consumer_destroy_metadata(socket, |
1333 | ksess->metadata); | |
6dc3064a DG |
1334 | goto error_consumer; |
1335 | } | |
1336 | } | |
1337 | ||
1338 | /* Snapshot metadata, */ | |
9a654598 | 1339 | status = consumer_snapshot_channel(socket, ksess->metadata->key, output, |
5c786ded | 1340 | 1, ksess->uid, ksess->gid, |
e098433c JG |
1341 | DEFAULT_KERNEL_TRACE_DIR, wait, 0, |
1342 | trace_archive_id); | |
9a654598 | 1343 | if (status != LTTNG_OK) { |
6dc3064a DG |
1344 | goto error_consumer; |
1345 | } | |
07b86b52 JD |
1346 | |
1347 | /* | |
1348 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1349 | * it's not monitored on the consumer side. | |
1350 | */ | |
1351 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1352 | } |
1353 | ||
1354 | error_consumer: | |
1355 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1356 | err = close(ksess->metadata_stream_fd); |
1357 | if (err < 0) { | |
6dc3064a DG |
1358 | PERROR("close snapshot kernel"); |
1359 | } | |
1360 | ||
1361 | error_open_stream: | |
1362 | trace_kernel_destroy_metadata(ksess->metadata); | |
1363 | error: | |
1364 | /* Restore metadata state.*/ | |
1365 | ksess->metadata = saved_metadata; | |
1366 | ksess->metadata_stream_fd = saved_metadata_fd; | |
e32d7f27 JG |
1367 | if (session) { |
1368 | session_put(session); | |
1369 | } | |
6dc3064a | 1370 | rcu_read_unlock(); |
9a654598 | 1371 | return status; |
6dc3064a | 1372 | } |
834978fd DG |
1373 | |
1374 | /* | |
1375 | * Get the syscall mask array from the kernel tracer. | |
1376 | * | |
1377 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1378 | * be freed. | |
1379 | */ | |
1380 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1381 | { | |
1382 | assert(syscall_mask); | |
1383 | assert(nr_bits); | |
1384 | ||
1385 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1386 | } | |
6e21424e JR |
1387 | |
1388 | /* | |
1389 | * Check for the support of the RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS via abi | |
1390 | * version number. | |
1391 | * | |
1392 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1393 | * of errors. | |
1394 | */ | |
1395 | int kernel_supports_ring_buffer_snapshot_sample_positions(int tracer_fd) | |
1396 | { | |
1397 | int ret = 0; // Not supported by default | |
1398 | struct lttng_kernel_tracer_abi_version abi; | |
1399 | ||
1400 | ret = kernctl_tracer_abi_version(tracer_fd, &abi); | |
1401 | if (ret < 0) { | |
1402 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1403 | goto error; | |
1404 | } | |
1405 | ||
1406 | /* | |
1407 | * RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS was introduced in 2.3 | |
1408 | */ | |
1409 | if (abi.major >= 2 && abi.minor >= 3) { | |
1410 | /* Supported */ | |
1411 | ret = 1; | |
1412 | } else { | |
1413 | /* Not supported */ | |
1414 | ret = 0; | |
1415 | } | |
1416 | error: | |
1417 | return ret; | |
1418 | } | |
5c408ad8 JD |
1419 | |
1420 | /* | |
1421 | * Rotate a kernel session. | |
1422 | * | |
d5a1b7aa | 1423 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 1424 | */ |
d5a1b7aa | 1425 | enum lttng_error_code kernel_rotate_session(struct ltt_session *session) |
5c408ad8 JD |
1426 | { |
1427 | int ret; | |
d5a1b7aa | 1428 | enum lttng_error_code status = LTTNG_OK; |
5c408ad8 JD |
1429 | struct consumer_socket *socket; |
1430 | struct lttng_ht_iter iter; | |
1431 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1432 | ||
1433 | assert(ksess); | |
1434 | assert(ksess->consumer); | |
1435 | ||
1436 | DBG("Rotate kernel session %s started (session %" PRIu64 ")", | |
1437 | session->name, session->id); | |
1438 | ||
1439 | rcu_read_lock(); | |
1440 | ||
1441 | /* | |
1442 | * Note that this loop will end after one iteration given that there is | |
1443 | * only one kernel consumer. | |
1444 | */ | |
1445 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1446 | socket, node.node) { | |
1447 | struct ltt_kernel_channel *chan; | |
1448 | ||
5c408ad8 JD |
1449 | /* For each channel, ask the consumer to rotate it. */ |
1450 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
92816cc3 JG |
1451 | DBG("Rotate kernel channel %" PRIu64 ", session %s", |
1452 | chan->key, session->name); | |
5c408ad8 JD |
1453 | ret = consumer_rotate_channel(socket, chan->key, |
1454 | ksess->uid, ksess->gid, ksess->consumer, | |
b178f53e | 1455 | ksess->consumer->domain_subdir, |
5c408ad8 | 1456 | /* is_metadata_channel */ false, |
92816cc3 | 1457 | session->current_archive_id); |
5c408ad8 | 1458 | if (ret < 0) { |
d5a1b7aa | 1459 | status = LTTNG_ERR_KERN_CONSUMER_FAIL; |
5c408ad8 JD |
1460 | goto error; |
1461 | } | |
1462 | } | |
1463 | ||
1464 | /* | |
1465 | * Rotate the metadata channel. | |
1466 | */ | |
22a1b931 | 1467 | ret = consumer_rotate_channel(socket, ksess->metadata->key, |
5c408ad8 | 1468 | ksess->uid, ksess->gid, ksess->consumer, |
b178f53e | 1469 | ksess->consumer->domain_subdir, |
5c408ad8 | 1470 | /* is_metadata_channel */ true, |
92816cc3 | 1471 | session->current_archive_id); |
5c408ad8 | 1472 | if (ret < 0) { |
d5a1b7aa | 1473 | status = LTTNG_ERR_KERN_CONSUMER_FAIL; |
5c408ad8 JD |
1474 | goto error; |
1475 | } | |
1476 | } | |
1477 | ||
5c408ad8 JD |
1478 | error: |
1479 | rcu_read_unlock(); | |
d5a1b7aa | 1480 | return status; |
5c408ad8 | 1481 | } |