Commit | Line | Data |
---|---|---|
54012638 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
54012638 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
54012638 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
c363b55d | 22 | #include <unistd.h> |
54012638 | 23 | |
990570ed DG |
24 | #include <common/common.h> |
25 | #include <common/defaults.h> | |
1e307fab | 26 | |
00e2e675 | 27 | #include "consumer.h" |
62499ad6 | 28 | #include "trace-kernel.h" |
54012638 | 29 | |
19e70852 | 30 | /* |
050349bb | 31 | * Find the channel name for the given kernel session. |
19e70852 | 32 | */ |
62499ad6 | 33 | struct ltt_kernel_channel *trace_kernel_get_channel_by_name( |
19e70852 DG |
34 | char *name, struct ltt_kernel_session *session) |
35 | { | |
36 | struct ltt_kernel_channel *chan; | |
37 | ||
0525e9ae DG |
38 | assert(session); |
39 | assert(name); | |
19e70852 | 40 | |
85076754 MD |
41 | /* |
42 | * If we receive an empty string for channel name, it means the | |
43 | * default channel name is requested. | |
44 | */ | |
45 | if (name[0] == '\0') | |
46 | name = DEFAULT_CHANNEL_NAME; | |
47 | ||
54d01ffb DG |
48 | DBG("Trying to find channel %s", name); |
49 | ||
19e70852 DG |
50 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
51 | if (strcmp(name, chan->channel->name) == 0) { | |
52 | DBG("Found channel by name %s", name); | |
53 | return chan; | |
54 | } | |
55 | } | |
56 | ||
19e70852 DG |
57 | return NULL; |
58 | } | |
59 | ||
60 | /* | |
050349bb | 61 | * Find the event name for the given channel. |
19e70852 | 62 | */ |
62499ad6 | 63 | struct ltt_kernel_event *trace_kernel_get_event_by_name( |
19e70852 DG |
64 | char *name, struct ltt_kernel_channel *channel) |
65 | { | |
66 | struct ltt_kernel_event *ev; | |
67 | ||
0525e9ae DG |
68 | assert(name); |
69 | assert(channel); | |
19e70852 DG |
70 | |
71 | cds_list_for_each_entry(ev, &channel->events_list.head, list) { | |
72 | if (strcmp(name, ev->event->name) == 0) { | |
73 | DBG("Found event by name %s for channel %s", name, | |
74 | channel->channel->name); | |
75 | return ev; | |
76 | } | |
77 | } | |
78 | ||
19e70852 DG |
79 | return NULL; |
80 | } | |
81 | ||
54012638 | 82 | /* |
050349bb | 83 | * Allocate and initialize a kernel session data structure. |
54012638 | 84 | * |
050349bb | 85 | * Return pointer to structure or NULL. |
54012638 | 86 | */ |
dec56f6c | 87 | struct ltt_kernel_session *trace_kernel_create_session(void) |
54012638 | 88 | { |
a4b92340 | 89 | struct ltt_kernel_session *lks = NULL; |
54012638 DG |
90 | |
91 | /* Allocate a new ltt kernel session */ | |
ba7f0ae5 | 92 | lks = zmalloc(sizeof(struct ltt_kernel_session)); |
54012638 | 93 | if (lks == NULL) { |
df0f840b | 94 | PERROR("create kernel session zmalloc"); |
a4b92340 | 95 | goto alloc_error; |
54012638 DG |
96 | } |
97 | ||
98 | /* Init data structure */ | |
03550b58 MD |
99 | lks->fd = -1; |
100 | lks->metadata_stream_fd = -1; | |
54012638 DG |
101 | lks->channel_count = 0; |
102 | lks->stream_count_global = 0; | |
103 | lks->metadata = NULL; | |
104 | CDS_INIT_LIST_HEAD(&lks->channel_list.head); | |
105 | ||
00e2e675 DG |
106 | lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL); |
107 | if (lks->consumer == NULL) { | |
108 | goto error; | |
109 | } | |
110 | ||
54012638 DG |
111 | return lks; |
112 | ||
113 | error: | |
a4b92340 DG |
114 | free(lks); |
115 | ||
116 | alloc_error: | |
54012638 DG |
117 | return NULL; |
118 | } | |
119 | ||
120 | /* | |
050349bb | 121 | * Allocate and initialize a kernel channel data structure. |
54012638 | 122 | * |
050349bb | 123 | * Return pointer to structure or NULL. |
54012638 | 124 | */ |
00e2e675 | 125 | struct ltt_kernel_channel *trace_kernel_create_channel( |
fdd9eb17 | 126 | struct lttng_channel *chan) |
54012638 | 127 | { |
54012638 | 128 | struct ltt_kernel_channel *lkc; |
54012638 | 129 | |
0525e9ae DG |
130 | assert(chan); |
131 | ||
ba7f0ae5 | 132 | lkc = zmalloc(sizeof(struct ltt_kernel_channel)); |
f3ed775e | 133 | if (lkc == NULL) { |
df0f840b | 134 | PERROR("ltt_kernel_channel zmalloc"); |
54012638 DG |
135 | goto error; |
136 | } | |
137 | ||
ba7f0ae5 | 138 | lkc->channel = zmalloc(sizeof(struct lttng_channel)); |
f3ed775e | 139 | if (lkc->channel == NULL) { |
df0f840b | 140 | PERROR("lttng_channel zmalloc"); |
ed594980 | 141 | free(lkc); |
f3ed775e DG |
142 | goto error; |
143 | } | |
144 | memcpy(lkc->channel, chan, sizeof(struct lttng_channel)); | |
54012638 | 145 | |
85076754 MD |
146 | /* |
147 | * If we receive an empty string for channel name, it means the | |
148 | * default channel name is requested. | |
149 | */ | |
150 | if (chan->name[0] == '\0') { | |
151 | strncpy(lkc->channel->name, DEFAULT_CHANNEL_NAME, | |
152 | sizeof(lkc->channel->name)); | |
153 | } | |
bd722d76 | 154 | lkc->channel->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
85076754 | 155 | |
03550b58 | 156 | lkc->fd = -1; |
54012638 | 157 | lkc->stream_count = 0; |
cbbbb275 | 158 | lkc->event_count = 0; |
d36b8583 | 159 | lkc->enabled = 1; |
54012638 DG |
160 | /* Init linked list */ |
161 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); | |
162 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); | |
645328ae | 163 | CDS_INIT_LIST_HEAD(&lkc->ctx_list); |
54012638 DG |
164 | |
165 | return lkc; | |
166 | ||
167 | error: | |
168 | return NULL; | |
169 | } | |
170 | ||
645328ae DG |
171 | /* |
172 | * Allocate and init a kernel context object. | |
173 | * | |
174 | * Return the allocated object or NULL on error. | |
175 | */ | |
176 | struct ltt_kernel_context *trace_kernel_create_context( | |
177 | struct lttng_kernel_context *ctx) | |
178 | { | |
179 | struct ltt_kernel_context *kctx; | |
180 | ||
181 | kctx = zmalloc(sizeof(*kctx)); | |
182 | if (!kctx) { | |
183 | PERROR("zmalloc kernel context"); | |
184 | goto error; | |
185 | } | |
186 | ||
187 | if (ctx) { | |
188 | memcpy(&kctx->ctx, ctx, sizeof(kctx->ctx)); | |
189 | } | |
190 | ||
7b9445b3 DG |
191 | CDS_INIT_LIST_HEAD(&kctx->list); |
192 | ||
645328ae DG |
193 | error: |
194 | return kctx; | |
195 | } | |
196 | ||
54012638 | 197 | /* |
050349bb | 198 | * Allocate and initialize a kernel event. Set name and event type. |
54012638 | 199 | * |
050349bb | 200 | * Return pointer to structure or NULL. |
54012638 | 201 | */ |
62499ad6 | 202 | struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev) |
54012638 DG |
203 | { |
204 | struct ltt_kernel_event *lke; | |
205 | struct lttng_kernel_event *attr; | |
206 | ||
0525e9ae DG |
207 | assert(ev); |
208 | ||
ba7f0ae5 DG |
209 | lke = zmalloc(sizeof(struct ltt_kernel_event)); |
210 | attr = zmalloc(sizeof(struct lttng_kernel_event)); | |
54012638 | 211 | if (lke == NULL || attr == NULL) { |
df0f840b | 212 | PERROR("kernel event zmalloc"); |
54012638 DG |
213 | goto error; |
214 | } | |
215 | ||
f3ed775e | 216 | switch (ev->type) { |
7d29a247 | 217 | case LTTNG_EVENT_PROBE: |
e6ddca71 | 218 | attr->instrumentation = LTTNG_KERNEL_KPROBE; |
7d29a247 DG |
219 | attr->u.kprobe.addr = ev->attr.probe.addr; |
220 | attr->u.kprobe.offset = ev->attr.probe.offset; | |
f3ed775e | 221 | strncpy(attr->u.kprobe.symbol_name, |
dbbb3ec5 DG |
222 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
223 | attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e DG |
224 | break; |
225 | case LTTNG_EVENT_FUNCTION: | |
8f0d098b MD |
226 | attr->instrumentation = LTTNG_KERNEL_KRETPROBE; |
227 | attr->u.kretprobe.addr = ev->attr.probe.addr; | |
228 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
8f0d098b | 229 | strncpy(attr->u.kretprobe.symbol_name, |
dbbb3ec5 DG |
230 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
231 | attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
8f0d098b MD |
232 | break; |
233 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
f3ed775e DG |
234 | attr->instrumentation = LTTNG_KERNEL_FUNCTION; |
235 | strncpy(attr->u.ftrace.symbol_name, | |
dbbb3ec5 DG |
236 | ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
237 | attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 238 | break; |
e6ddca71 DG |
239 | case LTTNG_EVENT_TRACEPOINT: |
240 | attr->instrumentation = LTTNG_KERNEL_TRACEPOINT; | |
f3ed775e | 241 | break; |
a54bd42d MD |
242 | case LTTNG_EVENT_SYSCALL: |
243 | attr->instrumentation = LTTNG_KERNEL_SYSCALL; | |
0133c199 | 244 | break; |
7a3d1328 MD |
245 | case LTTNG_EVENT_ALL: |
246 | attr->instrumentation = LTTNG_KERNEL_ALL; | |
247 | break; | |
f3ed775e DG |
248 | default: |
249 | ERR("Unknown kernel instrumentation type (%d)", ev->type); | |
250 | goto error; | |
251 | } | |
252 | ||
253 | /* Copy event name */ | |
dbbb3ec5 DG |
254 | strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN); |
255 | attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 256 | |
54012638 | 257 | /* Setting up a kernel event */ |
03550b58 | 258 | lke->fd = -1; |
54012638 | 259 | lke->event = attr; |
d36b8583 | 260 | lke->enabled = 1; |
54012638 DG |
261 | |
262 | return lke; | |
263 | ||
264 | error: | |
a2c0da86 MD |
265 | free(lke); |
266 | free(attr); | |
54012638 DG |
267 | return NULL; |
268 | } | |
269 | ||
270 | /* | |
050349bb | 271 | * Allocate and initialize a kernel metadata. |
54012638 | 272 | * |
050349bb | 273 | * Return pointer to structure or NULL. |
54012638 | 274 | */ |
a4b92340 | 275 | struct ltt_kernel_metadata *trace_kernel_create_metadata(void) |
54012638 | 276 | { |
54012638 | 277 | struct ltt_kernel_metadata *lkm; |
f3ed775e | 278 | struct lttng_channel *chan; |
54012638 | 279 | |
ba7f0ae5 DG |
280 | lkm = zmalloc(sizeof(struct ltt_kernel_metadata)); |
281 | chan = zmalloc(sizeof(struct lttng_channel)); | |
f3ed775e | 282 | if (lkm == NULL || chan == NULL) { |
df0f840b | 283 | PERROR("kernel metadata zmalloc"); |
54012638 DG |
284 | goto error; |
285 | } | |
286 | ||
287 | /* Set default attributes */ | |
f3ed775e | 288 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
3e230f92 | 289 | chan->attr.subbuf_size = default_get_metadata_subbuf_size(); |
b389abbe | 290 | chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; |
6bb9e85f MD |
291 | chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
292 | chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
7d452e12 | 293 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
54012638 DG |
294 | |
295 | /* Init metadata */ | |
03550b58 | 296 | lkm->fd = -1; |
f3ed775e | 297 | lkm->conf = chan; |
54012638 DG |
298 | |
299 | return lkm; | |
300 | ||
301 | error: | |
a2c0da86 MD |
302 | free(lkm); |
303 | free(chan); | |
54012638 DG |
304 | return NULL; |
305 | } | |
306 | ||
307 | /* | |
050349bb DG |
308 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by |
309 | * default. | |
54012638 | 310 | * |
050349bb | 311 | * Return pointer to structure or NULL. |
54012638 | 312 | */ |
00e2e675 DG |
313 | struct ltt_kernel_stream *trace_kernel_create_stream(const char *name, |
314 | unsigned int count) | |
54012638 | 315 | { |
00e2e675 | 316 | int ret; |
54012638 DG |
317 | struct ltt_kernel_stream *lks; |
318 | ||
0525e9ae DG |
319 | assert(name); |
320 | ||
ba7f0ae5 | 321 | lks = zmalloc(sizeof(struct ltt_kernel_stream)); |
54012638 | 322 | if (lks == NULL) { |
df0f840b | 323 | PERROR("kernel stream zmalloc"); |
54012638 DG |
324 | goto error; |
325 | } | |
326 | ||
00e2e675 | 327 | /* Set name */ |
535b8ff4 | 328 | ret = snprintf(lks->name, sizeof(lks->name), "%s_%u", name, count); |
00e2e675 DG |
329 | if (ret < 0) { |
330 | PERROR("snprintf stream name"); | |
331 | goto error; | |
332 | } | |
333 | lks->name[sizeof(lks->name) - 1] = '\0'; | |
334 | ||
54012638 | 335 | /* Init stream */ |
03550b58 | 336 | lks->fd = -1; |
54012638 | 337 | lks->state = 0; |
ffe60014 | 338 | lks->cpu = count; |
54012638 DG |
339 | |
340 | return lks; | |
341 | ||
342 | error: | |
343 | return NULL; | |
344 | } | |
c363b55d | 345 | |
050349bb DG |
346 | /* |
347 | * Cleanup kernel stream structure. | |
348 | */ | |
62499ad6 | 349 | void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream) |
c363b55d | 350 | { |
0525e9ae DG |
351 | assert(stream); |
352 | ||
33a2b854 | 353 | DBG("[trace] Closing stream fd %d", stream->fd); |
c363b55d | 354 | /* Close kernel fd */ |
03550b58 | 355 | if (stream->fd >= 0) { |
c617c0c6 MD |
356 | int ret; |
357 | ||
03550b58 MD |
358 | ret = close(stream->fd); |
359 | if (ret) { | |
360 | PERROR("close"); | |
361 | } | |
799e2c4f | 362 | } |
c363b55d DG |
363 | /* Remove from stream list */ |
364 | cds_list_del(&stream->list); | |
f9815039 | 365 | |
c363b55d DG |
366 | free(stream); |
367 | } | |
368 | ||
050349bb DG |
369 | /* |
370 | * Cleanup kernel event structure. | |
371 | */ | |
62499ad6 | 372 | void trace_kernel_destroy_event(struct ltt_kernel_event *event) |
c363b55d | 373 | { |
0525e9ae DG |
374 | assert(event); |
375 | ||
87eb4ab8 | 376 | if (event->fd >= 0) { |
c617c0c6 MD |
377 | int ret; |
378 | ||
87eb4ab8 MD |
379 | DBG("[trace] Closing event fd %d", event->fd); |
380 | /* Close kernel fd */ | |
799e2c4f MD |
381 | ret = close(event->fd); |
382 | if (ret) { | |
383 | PERROR("close"); | |
384 | } | |
87eb4ab8 MD |
385 | } else { |
386 | DBG("[trace] Tearing down event (no associated fd)"); | |
387 | } | |
c363b55d DG |
388 | |
389 | /* Remove from event list */ | |
390 | cds_list_del(&event->list); | |
f9815039 DG |
391 | |
392 | free(event->event); | |
c363b55d DG |
393 | free(event); |
394 | } | |
395 | ||
645328ae DG |
396 | /* |
397 | * Cleanup kernel context structure. | |
398 | */ | |
399 | void trace_kernel_destroy_context(struct ltt_kernel_context *ctx) | |
400 | { | |
401 | assert(ctx); | |
402 | ||
403 | cds_list_del(&ctx->list); | |
404 | free(ctx); | |
405 | } | |
406 | ||
050349bb DG |
407 | /* |
408 | * Cleanup kernel channel structure. | |
409 | */ | |
62499ad6 | 410 | void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel) |
c363b55d | 411 | { |
af9737e9 DG |
412 | struct ltt_kernel_stream *stream, *stmp; |
413 | struct ltt_kernel_event *event, *etmp; | |
645328ae | 414 | struct ltt_kernel_context *ctx, *ctmp; |
799e2c4f | 415 | int ret; |
c363b55d | 416 | |
0525e9ae DG |
417 | assert(channel); |
418 | ||
33a2b854 | 419 | DBG("[trace] Closing channel fd %d", channel->fd); |
c363b55d | 420 | /* Close kernel fd */ |
03550b58 MD |
421 | if (channel->fd >= 0) { |
422 | ret = close(channel->fd); | |
423 | if (ret) { | |
424 | PERROR("close"); | |
425 | } | |
799e2c4f | 426 | } |
c363b55d DG |
427 | |
428 | /* For each stream in the channel list */ | |
af9737e9 | 429 | cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) { |
62499ad6 | 430 | trace_kernel_destroy_stream(stream); |
c363b55d DG |
431 | } |
432 | ||
433 | /* For each event in the channel list */ | |
af9737e9 | 434 | cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) { |
62499ad6 | 435 | trace_kernel_destroy_event(event); |
c363b55d DG |
436 | } |
437 | ||
645328ae DG |
438 | /* For each context in the channel list */ |
439 | cds_list_for_each_entry_safe(ctx, ctmp, &channel->ctx_list, list) { | |
440 | trace_kernel_destroy_context(ctx); | |
441 | } | |
442 | ||
c363b55d DG |
443 | /* Remove from channel list */ |
444 | cds_list_del(&channel->list); | |
f9815039 | 445 | |
f9815039 | 446 | free(channel->channel); |
c363b55d DG |
447 | free(channel); |
448 | } | |
449 | ||
050349bb DG |
450 | /* |
451 | * Cleanup kernel metadata structure. | |
452 | */ | |
62499ad6 | 453 | void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata) |
c363b55d | 454 | { |
0525e9ae DG |
455 | assert(metadata); |
456 | ||
33a2b854 | 457 | DBG("[trace] Closing metadata fd %d", metadata->fd); |
c363b55d | 458 | /* Close kernel fd */ |
03550b58 | 459 | if (metadata->fd >= 0) { |
c617c0c6 MD |
460 | int ret; |
461 | ||
03550b58 MD |
462 | ret = close(metadata->fd); |
463 | if (ret) { | |
464 | PERROR("close"); | |
465 | } | |
799e2c4f | 466 | } |
c363b55d | 467 | |
f9815039 | 468 | free(metadata->conf); |
c363b55d DG |
469 | free(metadata); |
470 | } | |
471 | ||
050349bb | 472 | /* |
62499ad6 | 473 | * Cleanup kernel session structure |
36b588ed MD |
474 | * |
475 | * Should *NOT* be called with RCU read-side lock held. | |
050349bb | 476 | */ |
62499ad6 | 477 | void trace_kernel_destroy_session(struct ltt_kernel_session *session) |
c363b55d | 478 | { |
af9737e9 | 479 | struct ltt_kernel_channel *channel, *ctmp; |
799e2c4f | 480 | int ret; |
c363b55d | 481 | |
0525e9ae DG |
482 | assert(session); |
483 | ||
33a2b854 | 484 | DBG("[trace] Closing session fd %d", session->fd); |
c363b55d | 485 | /* Close kernel fds */ |
03550b58 MD |
486 | if (session->fd >= 0) { |
487 | ret = close(session->fd); | |
488 | if (ret) { | |
489 | PERROR("close"); | |
490 | } | |
799e2c4f | 491 | } |
f9815039 | 492 | |
03550b58 | 493 | if (session->metadata_stream_fd >= 0) { |
70dc1c34 | 494 | DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd); |
799e2c4f MD |
495 | ret = close(session->metadata_stream_fd); |
496 | if (ret) { | |
497 | PERROR("close"); | |
498 | } | |
70dc1c34 | 499 | } |
c363b55d | 500 | |
d36b8583 | 501 | if (session->metadata != NULL) { |
62499ad6 | 502 | trace_kernel_destroy_metadata(session->metadata); |
d36b8583 | 503 | } |
c363b55d | 504 | |
af9737e9 | 505 | cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) { |
62499ad6 | 506 | trace_kernel_destroy_channel(channel); |
c363b55d DG |
507 | } |
508 | ||
00e2e675 | 509 | /* Wipe consumer output object */ |
7ec4dd5a | 510 | consumer_output_put(session->consumer); |
00e2e675 | 511 | |
c363b55d DG |
512 | free(session); |
513 | } |