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 | ||
111 | /* | |
112 | * The tmp_consumer stays NULL until a set_consumer_uri command is | |
113 | * executed. At this point, the consumer should be nullify until an | |
114 | * enable_consumer command. This assignment is symbolic since we've zmalloc | |
115 | * the struct. | |
116 | */ | |
117 | lks->tmp_consumer = NULL; | |
118 | ||
54012638 DG |
119 | return lks; |
120 | ||
121 | error: | |
a4b92340 DG |
122 | free(lks); |
123 | ||
124 | alloc_error: | |
54012638 DG |
125 | return NULL; |
126 | } | |
127 | ||
128 | /* | |
050349bb | 129 | * Allocate and initialize a kernel channel data structure. |
54012638 | 130 | * |
050349bb | 131 | * Return pointer to structure or NULL. |
54012638 | 132 | */ |
00e2e675 | 133 | struct ltt_kernel_channel *trace_kernel_create_channel( |
fdd9eb17 | 134 | struct lttng_channel *chan) |
54012638 | 135 | { |
54012638 | 136 | struct ltt_kernel_channel *lkc; |
54012638 | 137 | |
0525e9ae DG |
138 | assert(chan); |
139 | ||
ba7f0ae5 | 140 | lkc = zmalloc(sizeof(struct ltt_kernel_channel)); |
f3ed775e | 141 | if (lkc == NULL) { |
df0f840b | 142 | PERROR("ltt_kernel_channel zmalloc"); |
54012638 DG |
143 | goto error; |
144 | } | |
145 | ||
ba7f0ae5 | 146 | lkc->channel = zmalloc(sizeof(struct lttng_channel)); |
f3ed775e | 147 | if (lkc->channel == NULL) { |
df0f840b | 148 | PERROR("lttng_channel zmalloc"); |
ed594980 | 149 | free(lkc); |
f3ed775e DG |
150 | goto error; |
151 | } | |
152 | memcpy(lkc->channel, chan, sizeof(struct lttng_channel)); | |
54012638 | 153 | |
85076754 MD |
154 | /* |
155 | * If we receive an empty string for channel name, it means the | |
156 | * default channel name is requested. | |
157 | */ | |
158 | if (chan->name[0] == '\0') { | |
159 | strncpy(lkc->channel->name, DEFAULT_CHANNEL_NAME, | |
160 | sizeof(lkc->channel->name)); | |
161 | } | |
bd722d76 | 162 | lkc->channel->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
85076754 | 163 | |
03550b58 | 164 | lkc->fd = -1; |
54012638 | 165 | lkc->stream_count = 0; |
cbbbb275 | 166 | lkc->event_count = 0; |
d36b8583 | 167 | lkc->enabled = 1; |
e75cda3a | 168 | lkc->ctx = NULL; |
54012638 DG |
169 | /* Init linked list */ |
170 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); | |
171 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); | |
54012638 DG |
172 | |
173 | return lkc; | |
174 | ||
175 | error: | |
176 | return NULL; | |
177 | } | |
178 | ||
179 | /* | |
050349bb | 180 | * Allocate and initialize a kernel event. Set name and event type. |
54012638 | 181 | * |
050349bb | 182 | * Return pointer to structure or NULL. |
54012638 | 183 | */ |
62499ad6 | 184 | struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev) |
54012638 DG |
185 | { |
186 | struct ltt_kernel_event *lke; | |
187 | struct lttng_kernel_event *attr; | |
188 | ||
0525e9ae DG |
189 | assert(ev); |
190 | ||
ba7f0ae5 DG |
191 | lke = zmalloc(sizeof(struct ltt_kernel_event)); |
192 | attr = zmalloc(sizeof(struct lttng_kernel_event)); | |
54012638 | 193 | if (lke == NULL || attr == NULL) { |
df0f840b | 194 | PERROR("kernel event zmalloc"); |
54012638 DG |
195 | goto error; |
196 | } | |
197 | ||
f3ed775e | 198 | switch (ev->type) { |
7d29a247 | 199 | case LTTNG_EVENT_PROBE: |
e6ddca71 | 200 | attr->instrumentation = LTTNG_KERNEL_KPROBE; |
7d29a247 DG |
201 | attr->u.kprobe.addr = ev->attr.probe.addr; |
202 | attr->u.kprobe.offset = ev->attr.probe.offset; | |
f3ed775e | 203 | strncpy(attr->u.kprobe.symbol_name, |
dbbb3ec5 DG |
204 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
205 | attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e DG |
206 | break; |
207 | case LTTNG_EVENT_FUNCTION: | |
8f0d098b MD |
208 | attr->instrumentation = LTTNG_KERNEL_KRETPROBE; |
209 | attr->u.kretprobe.addr = ev->attr.probe.addr; | |
210 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
8f0d098b | 211 | strncpy(attr->u.kretprobe.symbol_name, |
dbbb3ec5 DG |
212 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
213 | attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
8f0d098b MD |
214 | break; |
215 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
f3ed775e DG |
216 | attr->instrumentation = LTTNG_KERNEL_FUNCTION; |
217 | strncpy(attr->u.ftrace.symbol_name, | |
dbbb3ec5 DG |
218 | ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
219 | attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 220 | break; |
e6ddca71 DG |
221 | case LTTNG_EVENT_TRACEPOINT: |
222 | attr->instrumentation = LTTNG_KERNEL_TRACEPOINT; | |
f3ed775e | 223 | break; |
a54bd42d MD |
224 | case LTTNG_EVENT_SYSCALL: |
225 | attr->instrumentation = LTTNG_KERNEL_SYSCALL; | |
0133c199 | 226 | break; |
7a3d1328 MD |
227 | case LTTNG_EVENT_ALL: |
228 | attr->instrumentation = LTTNG_KERNEL_ALL; | |
229 | break; | |
f3ed775e DG |
230 | default: |
231 | ERR("Unknown kernel instrumentation type (%d)", ev->type); | |
232 | goto error; | |
233 | } | |
234 | ||
235 | /* Copy event name */ | |
dbbb3ec5 DG |
236 | strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN); |
237 | attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 238 | |
54012638 | 239 | /* Setting up a kernel event */ |
03550b58 | 240 | lke->fd = -1; |
54012638 | 241 | lke->event = attr; |
d36b8583 | 242 | lke->enabled = 1; |
54012638 DG |
243 | |
244 | return lke; | |
245 | ||
246 | error: | |
a2c0da86 MD |
247 | free(lke); |
248 | free(attr); | |
54012638 DG |
249 | return NULL; |
250 | } | |
251 | ||
252 | /* | |
050349bb | 253 | * Allocate and initialize a kernel metadata. |
54012638 | 254 | * |
050349bb | 255 | * Return pointer to structure or NULL. |
54012638 | 256 | */ |
a4b92340 | 257 | struct ltt_kernel_metadata *trace_kernel_create_metadata(void) |
54012638 | 258 | { |
54012638 | 259 | struct ltt_kernel_metadata *lkm; |
f3ed775e | 260 | struct lttng_channel *chan; |
54012638 | 261 | |
ba7f0ae5 DG |
262 | lkm = zmalloc(sizeof(struct ltt_kernel_metadata)); |
263 | chan = zmalloc(sizeof(struct lttng_channel)); | |
f3ed775e | 264 | if (lkm == NULL || chan == NULL) { |
df0f840b | 265 | PERROR("kernel metadata zmalloc"); |
54012638 DG |
266 | goto error; |
267 | } | |
268 | ||
269 | /* Set default attributes */ | |
f3ed775e | 270 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
3e230f92 | 271 | chan->attr.subbuf_size = default_get_metadata_subbuf_size(); |
b389abbe | 272 | chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; |
6bb9e85f MD |
273 | chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
274 | chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
7d452e12 | 275 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
54012638 DG |
276 | |
277 | /* Init metadata */ | |
03550b58 | 278 | lkm->fd = -1; |
f3ed775e | 279 | lkm->conf = chan; |
54012638 DG |
280 | |
281 | return lkm; | |
282 | ||
283 | error: | |
a2c0da86 MD |
284 | free(lkm); |
285 | free(chan); | |
54012638 DG |
286 | return NULL; |
287 | } | |
288 | ||
289 | /* | |
050349bb DG |
290 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by |
291 | * default. | |
54012638 | 292 | * |
050349bb | 293 | * Return pointer to structure or NULL. |
54012638 | 294 | */ |
00e2e675 DG |
295 | struct ltt_kernel_stream *trace_kernel_create_stream(const char *name, |
296 | unsigned int count) | |
54012638 | 297 | { |
00e2e675 | 298 | int ret; |
54012638 DG |
299 | struct ltt_kernel_stream *lks; |
300 | ||
0525e9ae DG |
301 | assert(name); |
302 | ||
ba7f0ae5 | 303 | lks = zmalloc(sizeof(struct ltt_kernel_stream)); |
54012638 | 304 | if (lks == NULL) { |
df0f840b | 305 | PERROR("kernel stream zmalloc"); |
54012638 DG |
306 | goto error; |
307 | } | |
308 | ||
00e2e675 DG |
309 | /* Set name */ |
310 | ret = snprintf(lks->name, sizeof(lks->name), "%s_%d", name, count); | |
311 | if (ret < 0) { | |
312 | PERROR("snprintf stream name"); | |
313 | goto error; | |
314 | } | |
315 | lks->name[sizeof(lks->name) - 1] = '\0'; | |
316 | ||
54012638 | 317 | /* Init stream */ |
03550b58 | 318 | lks->fd = -1; |
54012638 | 319 | lks->state = 0; |
ffe60014 | 320 | lks->cpu = count; |
54012638 DG |
321 | |
322 | return lks; | |
323 | ||
324 | error: | |
325 | return NULL; | |
326 | } | |
c363b55d | 327 | |
050349bb DG |
328 | /* |
329 | * Cleanup kernel stream structure. | |
330 | */ | |
62499ad6 | 331 | void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream) |
c363b55d | 332 | { |
0525e9ae DG |
333 | assert(stream); |
334 | ||
33a2b854 | 335 | DBG("[trace] Closing stream fd %d", stream->fd); |
c363b55d | 336 | /* Close kernel fd */ |
03550b58 | 337 | if (stream->fd >= 0) { |
c617c0c6 MD |
338 | int ret; |
339 | ||
03550b58 MD |
340 | ret = close(stream->fd); |
341 | if (ret) { | |
342 | PERROR("close"); | |
343 | } | |
799e2c4f | 344 | } |
c363b55d DG |
345 | /* Remove from stream list */ |
346 | cds_list_del(&stream->list); | |
f9815039 | 347 | |
c363b55d DG |
348 | free(stream); |
349 | } | |
350 | ||
050349bb DG |
351 | /* |
352 | * Cleanup kernel event structure. | |
353 | */ | |
62499ad6 | 354 | void trace_kernel_destroy_event(struct ltt_kernel_event *event) |
c363b55d | 355 | { |
0525e9ae DG |
356 | assert(event); |
357 | ||
87eb4ab8 | 358 | if (event->fd >= 0) { |
c617c0c6 MD |
359 | int ret; |
360 | ||
87eb4ab8 MD |
361 | DBG("[trace] Closing event fd %d", event->fd); |
362 | /* Close kernel fd */ | |
799e2c4f MD |
363 | ret = close(event->fd); |
364 | if (ret) { | |
365 | PERROR("close"); | |
366 | } | |
87eb4ab8 MD |
367 | } else { |
368 | DBG("[trace] Tearing down event (no associated fd)"); | |
369 | } | |
c363b55d DG |
370 | |
371 | /* Remove from event list */ | |
372 | cds_list_del(&event->list); | |
f9815039 DG |
373 | |
374 | free(event->event); | |
c363b55d DG |
375 | free(event); |
376 | } | |
377 | ||
050349bb DG |
378 | /* |
379 | * Cleanup kernel channel structure. | |
380 | */ | |
62499ad6 | 381 | void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel) |
c363b55d | 382 | { |
af9737e9 DG |
383 | struct ltt_kernel_stream *stream, *stmp; |
384 | struct ltt_kernel_event *event, *etmp; | |
799e2c4f | 385 | int ret; |
c363b55d | 386 | |
0525e9ae DG |
387 | assert(channel); |
388 | ||
33a2b854 | 389 | DBG("[trace] Closing channel fd %d", channel->fd); |
c363b55d | 390 | /* Close kernel fd */ |
03550b58 MD |
391 | if (channel->fd >= 0) { |
392 | ret = close(channel->fd); | |
393 | if (ret) { | |
394 | PERROR("close"); | |
395 | } | |
799e2c4f | 396 | } |
c363b55d DG |
397 | |
398 | /* For each stream in the channel list */ | |
af9737e9 | 399 | cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) { |
62499ad6 | 400 | trace_kernel_destroy_stream(stream); |
c363b55d DG |
401 | } |
402 | ||
403 | /* For each event in the channel list */ | |
af9737e9 | 404 | cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) { |
62499ad6 | 405 | trace_kernel_destroy_event(event); |
c363b55d DG |
406 | } |
407 | ||
408 | /* Remove from channel list */ | |
409 | cds_list_del(&channel->list); | |
f9815039 | 410 | |
f9815039 DG |
411 | free(channel->channel); |
412 | free(channel->ctx); | |
c363b55d DG |
413 | free(channel); |
414 | } | |
415 | ||
050349bb DG |
416 | /* |
417 | * Cleanup kernel metadata structure. | |
418 | */ | |
62499ad6 | 419 | void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata) |
c363b55d | 420 | { |
0525e9ae DG |
421 | assert(metadata); |
422 | ||
33a2b854 | 423 | DBG("[trace] Closing metadata fd %d", metadata->fd); |
c363b55d | 424 | /* Close kernel fd */ |
03550b58 | 425 | if (metadata->fd >= 0) { |
c617c0c6 MD |
426 | int ret; |
427 | ||
03550b58 MD |
428 | ret = close(metadata->fd); |
429 | if (ret) { | |
430 | PERROR("close"); | |
431 | } | |
799e2c4f | 432 | } |
c363b55d | 433 | |
f9815039 | 434 | free(metadata->conf); |
c363b55d DG |
435 | free(metadata); |
436 | } | |
437 | ||
050349bb | 438 | /* |
62499ad6 | 439 | * Cleanup kernel session structure |
36b588ed MD |
440 | * |
441 | * Should *NOT* be called with RCU read-side lock held. | |
050349bb | 442 | */ |
62499ad6 | 443 | void trace_kernel_destroy_session(struct ltt_kernel_session *session) |
c363b55d | 444 | { |
af9737e9 | 445 | struct ltt_kernel_channel *channel, *ctmp; |
799e2c4f | 446 | int ret; |
c363b55d | 447 | |
0525e9ae DG |
448 | assert(session); |
449 | ||
33a2b854 | 450 | DBG("[trace] Closing session fd %d", session->fd); |
c363b55d | 451 | /* Close kernel fds */ |
03550b58 MD |
452 | if (session->fd >= 0) { |
453 | ret = close(session->fd); | |
454 | if (ret) { | |
455 | PERROR("close"); | |
456 | } | |
799e2c4f | 457 | } |
f9815039 | 458 | |
03550b58 | 459 | if (session->metadata_stream_fd >= 0) { |
70dc1c34 | 460 | DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd); |
799e2c4f MD |
461 | ret = close(session->metadata_stream_fd); |
462 | if (ret) { | |
463 | PERROR("close"); | |
464 | } | |
70dc1c34 | 465 | } |
c363b55d | 466 | |
d36b8583 | 467 | if (session->metadata != NULL) { |
62499ad6 | 468 | trace_kernel_destroy_metadata(session->metadata); |
d36b8583 | 469 | } |
c363b55d | 470 | |
af9737e9 | 471 | cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) { |
62499ad6 | 472 | trace_kernel_destroy_channel(channel); |
c363b55d DG |
473 | } |
474 | ||
00e2e675 DG |
475 | /* Wipe consumer output object */ |
476 | consumer_destroy_output(session->consumer); | |
477 | consumer_destroy_output(session->tmp_consumer); | |
478 | ||
c363b55d DG |
479 | free(session); |
480 | } |