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 | |
54d01ffb DG |
41 | DBG("Trying to find channel %s", name); |
42 | ||
19e70852 DG |
43 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
44 | if (strcmp(name, chan->channel->name) == 0) { | |
45 | DBG("Found channel by name %s", name); | |
46 | return chan; | |
47 | } | |
48 | } | |
49 | ||
19e70852 DG |
50 | return NULL; |
51 | } | |
52 | ||
53 | /* | |
050349bb | 54 | * Find the event name for the given channel. |
19e70852 | 55 | */ |
62499ad6 | 56 | struct ltt_kernel_event *trace_kernel_get_event_by_name( |
19e70852 DG |
57 | char *name, struct ltt_kernel_channel *channel) |
58 | { | |
59 | struct ltt_kernel_event *ev; | |
60 | ||
0525e9ae DG |
61 | assert(name); |
62 | assert(channel); | |
19e70852 DG |
63 | |
64 | cds_list_for_each_entry(ev, &channel->events_list.head, list) { | |
65 | if (strcmp(name, ev->event->name) == 0) { | |
66 | DBG("Found event by name %s for channel %s", name, | |
67 | channel->channel->name); | |
68 | return ev; | |
69 | } | |
70 | } | |
71 | ||
19e70852 DG |
72 | return NULL; |
73 | } | |
74 | ||
54012638 | 75 | /* |
050349bb | 76 | * Allocate and initialize a kernel session data structure. |
54012638 | 77 | * |
050349bb | 78 | * Return pointer to structure or NULL. |
54012638 | 79 | */ |
f9815039 | 80 | struct ltt_kernel_session *trace_kernel_create_session(char *path) |
54012638 | 81 | { |
a4b92340 | 82 | struct ltt_kernel_session *lks = NULL; |
54012638 DG |
83 | |
84 | /* Allocate a new ltt kernel session */ | |
ba7f0ae5 | 85 | lks = zmalloc(sizeof(struct ltt_kernel_session)); |
54012638 | 86 | if (lks == NULL) { |
df0f840b | 87 | PERROR("create kernel session zmalloc"); |
a4b92340 | 88 | goto alloc_error; |
54012638 DG |
89 | } |
90 | ||
91 | /* Init data structure */ | |
03550b58 MD |
92 | lks->fd = -1; |
93 | lks->metadata_stream_fd = -1; | |
54012638 DG |
94 | lks->channel_count = 0; |
95 | lks->stream_count_global = 0; | |
96 | lks->metadata = NULL; | |
97 | CDS_INIT_LIST_HEAD(&lks->channel_list.head); | |
98 | ||
00e2e675 DG |
99 | lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL); |
100 | if (lks->consumer == NULL) { | |
101 | goto error; | |
102 | } | |
103 | ||
104 | /* | |
105 | * The tmp_consumer stays NULL until a set_consumer_uri command is | |
106 | * executed. At this point, the consumer should be nullify until an | |
107 | * enable_consumer command. This assignment is symbolic since we've zmalloc | |
108 | * the struct. | |
109 | */ | |
110 | lks->tmp_consumer = NULL; | |
111 | ||
9d035200 | 112 | if (*path != '\0') { |
c617c0c6 MD |
113 | int ret; |
114 | ||
a4b92340 DG |
115 | /* Use the default consumer output which is the tracing session path. */ |
116 | ret = snprintf(lks->consumer->dst.trace_path, PATH_MAX, | |
117 | "%s" DEFAULT_KERNEL_TRACE_DIR, path); | |
118 | if (ret < 0) { | |
119 | PERROR("snprintf consumer trace path"); | |
120 | goto error; | |
121 | } | |
00e2e675 | 122 | |
a4b92340 DG |
123 | /* Set session path */ |
124 | ret = asprintf(&lks->trace_path, "%s" DEFAULT_KERNEL_TRACE_DIR, path); | |
125 | if (ret < 0) { | |
126 | PERROR("asprintf kernel traces path"); | |
127 | goto error; | |
128 | } | |
f9815039 DG |
129 | } |
130 | ||
54012638 DG |
131 | return lks; |
132 | ||
133 | error: | |
a4b92340 DG |
134 | free(lks); |
135 | ||
136 | alloc_error: | |
54012638 DG |
137 | return NULL; |
138 | } | |
139 | ||
140 | /* | |
050349bb | 141 | * Allocate and initialize a kernel channel data structure. |
54012638 | 142 | * |
050349bb | 143 | * Return pointer to structure or NULL. |
54012638 | 144 | */ |
00e2e675 | 145 | struct ltt_kernel_channel *trace_kernel_create_channel( |
fdd9eb17 | 146 | struct lttng_channel *chan) |
54012638 | 147 | { |
54012638 | 148 | struct ltt_kernel_channel *lkc; |
54012638 | 149 | |
0525e9ae DG |
150 | assert(chan); |
151 | ||
ba7f0ae5 | 152 | lkc = zmalloc(sizeof(struct ltt_kernel_channel)); |
f3ed775e | 153 | if (lkc == NULL) { |
df0f840b | 154 | PERROR("ltt_kernel_channel zmalloc"); |
54012638 DG |
155 | goto error; |
156 | } | |
157 | ||
ba7f0ae5 | 158 | lkc->channel = zmalloc(sizeof(struct lttng_channel)); |
f3ed775e | 159 | if (lkc->channel == NULL) { |
df0f840b | 160 | PERROR("lttng_channel zmalloc"); |
ed594980 | 161 | free(lkc); |
f3ed775e DG |
162 | goto error; |
163 | } | |
164 | memcpy(lkc->channel, chan, sizeof(struct lttng_channel)); | |
54012638 | 165 | |
03550b58 | 166 | lkc->fd = -1; |
54012638 | 167 | lkc->stream_count = 0; |
cbbbb275 | 168 | lkc->event_count = 0; |
d36b8583 | 169 | lkc->enabled = 1; |
e75cda3a | 170 | lkc->ctx = NULL; |
54012638 DG |
171 | /* Init linked list */ |
172 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); | |
173 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); | |
54012638 DG |
174 | |
175 | return lkc; | |
176 | ||
177 | error: | |
178 | return NULL; | |
179 | } | |
180 | ||
181 | /* | |
050349bb | 182 | * Allocate and initialize a kernel event. Set name and event type. |
54012638 | 183 | * |
050349bb | 184 | * Return pointer to structure or NULL. |
54012638 | 185 | */ |
62499ad6 | 186 | struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev) |
54012638 DG |
187 | { |
188 | struct ltt_kernel_event *lke; | |
189 | struct lttng_kernel_event *attr; | |
190 | ||
0525e9ae DG |
191 | assert(ev); |
192 | ||
ba7f0ae5 DG |
193 | lke = zmalloc(sizeof(struct ltt_kernel_event)); |
194 | attr = zmalloc(sizeof(struct lttng_kernel_event)); | |
54012638 | 195 | if (lke == NULL || attr == NULL) { |
df0f840b | 196 | PERROR("kernel event zmalloc"); |
54012638 DG |
197 | goto error; |
198 | } | |
199 | ||
f3ed775e | 200 | switch (ev->type) { |
7d29a247 | 201 | case LTTNG_EVENT_PROBE: |
e6ddca71 | 202 | attr->instrumentation = LTTNG_KERNEL_KPROBE; |
7d29a247 DG |
203 | attr->u.kprobe.addr = ev->attr.probe.addr; |
204 | attr->u.kprobe.offset = ev->attr.probe.offset; | |
f3ed775e | 205 | strncpy(attr->u.kprobe.symbol_name, |
dbbb3ec5 DG |
206 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
207 | attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e DG |
208 | break; |
209 | case LTTNG_EVENT_FUNCTION: | |
8f0d098b MD |
210 | attr->instrumentation = LTTNG_KERNEL_KRETPROBE; |
211 | attr->u.kretprobe.addr = ev->attr.probe.addr; | |
212 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
213 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
214 | strncpy(attr->u.kretprobe.symbol_name, | |
dbbb3ec5 DG |
215 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
216 | attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
8f0d098b MD |
217 | break; |
218 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
f3ed775e DG |
219 | attr->instrumentation = LTTNG_KERNEL_FUNCTION; |
220 | strncpy(attr->u.ftrace.symbol_name, | |
dbbb3ec5 DG |
221 | ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
222 | attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 223 | break; |
e6ddca71 DG |
224 | case LTTNG_EVENT_TRACEPOINT: |
225 | attr->instrumentation = LTTNG_KERNEL_TRACEPOINT; | |
f3ed775e | 226 | break; |
a54bd42d MD |
227 | case LTTNG_EVENT_SYSCALL: |
228 | attr->instrumentation = LTTNG_KERNEL_SYSCALL; | |
0133c199 | 229 | break; |
7a3d1328 MD |
230 | case LTTNG_EVENT_ALL: |
231 | attr->instrumentation = LTTNG_KERNEL_ALL; | |
232 | break; | |
f3ed775e DG |
233 | default: |
234 | ERR("Unknown kernel instrumentation type (%d)", ev->type); | |
235 | goto error; | |
236 | } | |
237 | ||
238 | /* Copy event name */ | |
dbbb3ec5 DG |
239 | strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN); |
240 | attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 241 | |
54012638 | 242 | /* Setting up a kernel event */ |
03550b58 | 243 | lke->fd = -1; |
54012638 | 244 | lke->event = attr; |
d36b8583 | 245 | lke->enabled = 1; |
54012638 DG |
246 | |
247 | return lke; | |
248 | ||
249 | error: | |
a2c0da86 MD |
250 | free(lke); |
251 | free(attr); | |
54012638 DG |
252 | return NULL; |
253 | } | |
254 | ||
255 | /* | |
050349bb | 256 | * Allocate and initialize a kernel metadata. |
54012638 | 257 | * |
050349bb | 258 | * Return pointer to structure or NULL. |
54012638 | 259 | */ |
a4b92340 | 260 | struct ltt_kernel_metadata *trace_kernel_create_metadata(void) |
54012638 | 261 | { |
54012638 | 262 | struct ltt_kernel_metadata *lkm; |
f3ed775e | 263 | struct lttng_channel *chan; |
54012638 | 264 | |
ba7f0ae5 DG |
265 | lkm = zmalloc(sizeof(struct ltt_kernel_metadata)); |
266 | chan = zmalloc(sizeof(struct lttng_channel)); | |
f3ed775e | 267 | if (lkm == NULL || chan == NULL) { |
df0f840b | 268 | PERROR("kernel metadata zmalloc"); |
54012638 DG |
269 | goto error; |
270 | } | |
271 | ||
272 | /* Set default attributes */ | |
f3ed775e | 273 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
3e230f92 | 274 | chan->attr.subbuf_size = default_get_metadata_subbuf_size(); |
b389abbe | 275 | chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; |
6bb9e85f MD |
276 | chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
277 | chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
7d452e12 | 278 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
54012638 DG |
279 | |
280 | /* Init metadata */ | |
03550b58 | 281 | lkm->fd = -1; |
f3ed775e | 282 | lkm->conf = chan; |
54012638 DG |
283 | |
284 | return lkm; | |
285 | ||
286 | error: | |
a2c0da86 MD |
287 | free(lkm); |
288 | free(chan); | |
54012638 DG |
289 | return NULL; |
290 | } | |
291 | ||
292 | /* | |
050349bb DG |
293 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by |
294 | * default. | |
54012638 | 295 | * |
050349bb | 296 | * Return pointer to structure or NULL. |
54012638 | 297 | */ |
00e2e675 DG |
298 | struct ltt_kernel_stream *trace_kernel_create_stream(const char *name, |
299 | unsigned int count) | |
54012638 | 300 | { |
00e2e675 | 301 | int ret; |
54012638 DG |
302 | struct ltt_kernel_stream *lks; |
303 | ||
0525e9ae DG |
304 | assert(name); |
305 | ||
ba7f0ae5 | 306 | lks = zmalloc(sizeof(struct ltt_kernel_stream)); |
54012638 | 307 | if (lks == NULL) { |
df0f840b | 308 | PERROR("kernel stream zmalloc"); |
54012638 DG |
309 | goto error; |
310 | } | |
311 | ||
00e2e675 DG |
312 | /* Set name */ |
313 | ret = snprintf(lks->name, sizeof(lks->name), "%s_%d", name, count); | |
314 | if (ret < 0) { | |
315 | PERROR("snprintf stream name"); | |
316 | goto error; | |
317 | } | |
318 | lks->name[sizeof(lks->name) - 1] = '\0'; | |
319 | ||
54012638 | 320 | /* Init stream */ |
03550b58 | 321 | lks->fd = -1; |
54012638 | 322 | lks->state = 0; |
ffe60014 | 323 | lks->cpu = count; |
54012638 DG |
324 | |
325 | return lks; | |
326 | ||
327 | error: | |
328 | return NULL; | |
329 | } | |
c363b55d | 330 | |
050349bb DG |
331 | /* |
332 | * Cleanup kernel stream structure. | |
333 | */ | |
62499ad6 | 334 | void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream) |
c363b55d | 335 | { |
0525e9ae DG |
336 | assert(stream); |
337 | ||
33a2b854 | 338 | DBG("[trace] Closing stream fd %d", stream->fd); |
c363b55d | 339 | /* Close kernel fd */ |
03550b58 | 340 | if (stream->fd >= 0) { |
c617c0c6 MD |
341 | int ret; |
342 | ||
03550b58 MD |
343 | ret = close(stream->fd); |
344 | if (ret) { | |
345 | PERROR("close"); | |
346 | } | |
799e2c4f | 347 | } |
c363b55d DG |
348 | /* Remove from stream list */ |
349 | cds_list_del(&stream->list); | |
f9815039 | 350 | |
c363b55d DG |
351 | free(stream); |
352 | } | |
353 | ||
050349bb DG |
354 | /* |
355 | * Cleanup kernel event structure. | |
356 | */ | |
62499ad6 | 357 | void trace_kernel_destroy_event(struct ltt_kernel_event *event) |
c363b55d | 358 | { |
0525e9ae DG |
359 | assert(event); |
360 | ||
87eb4ab8 | 361 | if (event->fd >= 0) { |
c617c0c6 MD |
362 | int ret; |
363 | ||
87eb4ab8 MD |
364 | DBG("[trace] Closing event fd %d", event->fd); |
365 | /* Close kernel fd */ | |
799e2c4f MD |
366 | ret = close(event->fd); |
367 | if (ret) { | |
368 | PERROR("close"); | |
369 | } | |
87eb4ab8 MD |
370 | } else { |
371 | DBG("[trace] Tearing down event (no associated fd)"); | |
372 | } | |
c363b55d DG |
373 | |
374 | /* Remove from event list */ | |
375 | cds_list_del(&event->list); | |
f9815039 DG |
376 | |
377 | free(event->event); | |
c363b55d DG |
378 | free(event); |
379 | } | |
380 | ||
050349bb DG |
381 | /* |
382 | * Cleanup kernel channel structure. | |
383 | */ | |
62499ad6 | 384 | void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel) |
c363b55d | 385 | { |
af9737e9 DG |
386 | struct ltt_kernel_stream *stream, *stmp; |
387 | struct ltt_kernel_event *event, *etmp; | |
799e2c4f | 388 | int ret; |
c363b55d | 389 | |
0525e9ae DG |
390 | assert(channel); |
391 | ||
33a2b854 | 392 | DBG("[trace] Closing channel fd %d", channel->fd); |
c363b55d | 393 | /* Close kernel fd */ |
03550b58 MD |
394 | if (channel->fd >= 0) { |
395 | ret = close(channel->fd); | |
396 | if (ret) { | |
397 | PERROR("close"); | |
398 | } | |
799e2c4f | 399 | } |
c363b55d DG |
400 | |
401 | /* For each stream in the channel list */ | |
af9737e9 | 402 | cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) { |
62499ad6 | 403 | trace_kernel_destroy_stream(stream); |
c363b55d DG |
404 | } |
405 | ||
406 | /* For each event in the channel list */ | |
af9737e9 | 407 | cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) { |
62499ad6 | 408 | trace_kernel_destroy_event(event); |
c363b55d DG |
409 | } |
410 | ||
411 | /* Remove from channel list */ | |
412 | cds_list_del(&channel->list); | |
f9815039 | 413 | |
f9815039 DG |
414 | free(channel->channel); |
415 | free(channel->ctx); | |
c363b55d DG |
416 | free(channel); |
417 | } | |
418 | ||
050349bb DG |
419 | /* |
420 | * Cleanup kernel metadata structure. | |
421 | */ | |
62499ad6 | 422 | void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata) |
c363b55d | 423 | { |
0525e9ae DG |
424 | assert(metadata); |
425 | ||
33a2b854 | 426 | DBG("[trace] Closing metadata fd %d", metadata->fd); |
c363b55d | 427 | /* Close kernel fd */ |
03550b58 | 428 | if (metadata->fd >= 0) { |
c617c0c6 MD |
429 | int ret; |
430 | ||
03550b58 MD |
431 | ret = close(metadata->fd); |
432 | if (ret) { | |
433 | PERROR("close"); | |
434 | } | |
799e2c4f | 435 | } |
c363b55d | 436 | |
f9815039 | 437 | free(metadata->conf); |
c363b55d DG |
438 | free(metadata); |
439 | } | |
440 | ||
050349bb | 441 | /* |
62499ad6 | 442 | * Cleanup kernel session structure |
050349bb | 443 | */ |
62499ad6 | 444 | void trace_kernel_destroy_session(struct ltt_kernel_session *session) |
c363b55d | 445 | { |
af9737e9 | 446 | struct ltt_kernel_channel *channel, *ctmp; |
799e2c4f | 447 | int ret; |
c363b55d | 448 | |
0525e9ae DG |
449 | assert(session); |
450 | ||
33a2b854 | 451 | DBG("[trace] Closing session fd %d", session->fd); |
c363b55d | 452 | /* Close kernel fds */ |
03550b58 MD |
453 | if (session->fd >= 0) { |
454 | ret = close(session->fd); | |
455 | if (ret) { | |
456 | PERROR("close"); | |
457 | } | |
799e2c4f | 458 | } |
f9815039 | 459 | |
03550b58 | 460 | if (session->metadata_stream_fd >= 0) { |
70dc1c34 | 461 | DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd); |
799e2c4f MD |
462 | ret = close(session->metadata_stream_fd); |
463 | if (ret) { | |
464 | PERROR("close"); | |
465 | } | |
70dc1c34 | 466 | } |
c363b55d | 467 | |
d36b8583 | 468 | if (session->metadata != NULL) { |
62499ad6 | 469 | trace_kernel_destroy_metadata(session->metadata); |
d36b8583 | 470 | } |
c363b55d | 471 | |
af9737e9 | 472 | cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) { |
62499ad6 | 473 | trace_kernel_destroy_channel(channel); |
c363b55d DG |
474 | } |
475 | ||
00e2e675 DG |
476 | /* Wipe consumer output object */ |
477 | consumer_destroy_output(session->consumer); | |
478 | consumer_destroy_output(session->tmp_consumer); | |
479 | ||
f9815039 | 480 | free(session->trace_path); |
c363b55d DG |
481 | free(session); |
482 | } |