Commit | Line | Data |
---|---|---|
54012638 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
6 | * as published by the Free Software Foundation; only version 2 |
7 | * of the License. | |
54012638 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
c363b55d | 23 | #include <unistd.h> |
54012638 | 24 | |
990570ed DG |
25 | #include <common/common.h> |
26 | #include <common/defaults.h> | |
1e307fab | 27 | |
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 | ||
38 | if (session == NULL) { | |
39 | ERR("Undefine session"); | |
40 | goto error; | |
41 | } | |
42 | ||
54d01ffb DG |
43 | DBG("Trying to find channel %s", name); |
44 | ||
19e70852 DG |
45 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
46 | if (strcmp(name, chan->channel->name) == 0) { | |
47 | DBG("Found channel by name %s", name); | |
48 | return chan; | |
49 | } | |
50 | } | |
51 | ||
52 | error: | |
53 | return NULL; | |
54 | } | |
55 | ||
56 | /* | |
050349bb | 57 | * Find the event name for the given channel. |
19e70852 | 58 | */ |
62499ad6 | 59 | struct ltt_kernel_event *trace_kernel_get_event_by_name( |
19e70852 DG |
60 | char *name, struct ltt_kernel_channel *channel) |
61 | { | |
62 | struct ltt_kernel_event *ev; | |
63 | ||
64 | if (channel == NULL) { | |
65 | ERR("Undefine channel"); | |
66 | goto error; | |
67 | } | |
68 | ||
69 | cds_list_for_each_entry(ev, &channel->events_list.head, list) { | |
70 | if (strcmp(name, ev->event->name) == 0) { | |
71 | DBG("Found event by name %s for channel %s", name, | |
72 | channel->channel->name); | |
73 | return ev; | |
74 | } | |
75 | } | |
76 | ||
77 | error: | |
78 | return NULL; | |
79 | } | |
80 | ||
54012638 | 81 | /* |
050349bb | 82 | * Allocate and initialize a kernel session data structure. |
54012638 | 83 | * |
050349bb | 84 | * Return pointer to structure or NULL. |
54012638 | 85 | */ |
f9815039 | 86 | struct ltt_kernel_session *trace_kernel_create_session(char *path) |
54012638 | 87 | { |
f9815039 | 88 | int ret; |
54012638 DG |
89 | struct ltt_kernel_session *lks; |
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"); |
54012638 DG |
95 | goto error; |
96 | } | |
97 | ||
98 | /* Init data structure */ | |
99 | lks->fd = 0; | |
100 | lks->metadata_stream_fd = 0; | |
101 | lks->channel_count = 0; | |
102 | lks->stream_count_global = 0; | |
103 | lks->metadata = NULL; | |
d9800920 | 104 | lks->consumer_fd = 0; |
54012638 DG |
105 | CDS_INIT_LIST_HEAD(&lks->channel_list.head); |
106 | ||
f9815039 DG |
107 | /* Set session path */ |
108 | ret = asprintf(&lks->trace_path, "%s/kernel", path); | |
109 | if (ret < 0) { | |
df0f840b | 110 | PERROR("asprintf kernel traces path"); |
f9815039 DG |
111 | goto error; |
112 | } | |
113 | ||
54012638 DG |
114 | return lks; |
115 | ||
116 | error: | |
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 | */ |
62499ad6 | 125 | struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path) |
54012638 DG |
126 | { |
127 | int ret; | |
128 | struct ltt_kernel_channel *lkc; | |
54012638 | 129 | |
ba7f0ae5 | 130 | lkc = zmalloc(sizeof(struct ltt_kernel_channel)); |
f3ed775e | 131 | if (lkc == NULL) { |
df0f840b | 132 | PERROR("ltt_kernel_channel zmalloc"); |
54012638 DG |
133 | goto error; |
134 | } | |
135 | ||
ba7f0ae5 | 136 | lkc->channel = zmalloc(sizeof(struct lttng_channel)); |
f3ed775e | 137 | if (lkc->channel == NULL) { |
df0f840b | 138 | PERROR("lttng_channel zmalloc"); |
f3ed775e DG |
139 | goto error; |
140 | } | |
141 | memcpy(lkc->channel, chan, sizeof(struct lttng_channel)); | |
54012638 DG |
142 | |
143 | lkc->fd = 0; | |
144 | lkc->stream_count = 0; | |
cbbbb275 | 145 | lkc->event_count = 0; |
d36b8583 | 146 | lkc->enabled = 1; |
e75cda3a | 147 | lkc->ctx = NULL; |
54012638 DG |
148 | /* Init linked list */ |
149 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); | |
150 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); | |
151 | /* Set default trace output path */ | |
b082db07 | 152 | ret = asprintf(&lkc->pathname, "%s", path); |
54012638 | 153 | if (ret < 0) { |
df0f840b | 154 | PERROR("asprintf kernel create channel"); |
54012638 DG |
155 | goto error; |
156 | } | |
157 | ||
158 | return lkc; | |
159 | ||
160 | error: | |
161 | return NULL; | |
162 | } | |
163 | ||
164 | /* | |
050349bb | 165 | * Allocate and initialize a kernel event. Set name and event type. |
54012638 | 166 | * |
050349bb | 167 | * Return pointer to structure or NULL. |
54012638 | 168 | */ |
62499ad6 | 169 | struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev) |
54012638 DG |
170 | { |
171 | struct ltt_kernel_event *lke; | |
172 | struct lttng_kernel_event *attr; | |
173 | ||
ba7f0ae5 DG |
174 | lke = zmalloc(sizeof(struct ltt_kernel_event)); |
175 | attr = zmalloc(sizeof(struct lttng_kernel_event)); | |
54012638 | 176 | if (lke == NULL || attr == NULL) { |
df0f840b | 177 | PERROR("kernel event zmalloc"); |
54012638 DG |
178 | goto error; |
179 | } | |
180 | ||
f3ed775e | 181 | switch (ev->type) { |
7d29a247 | 182 | case LTTNG_EVENT_PROBE: |
e6ddca71 | 183 | attr->instrumentation = LTTNG_KERNEL_KPROBE; |
7d29a247 DG |
184 | attr->u.kprobe.addr = ev->attr.probe.addr; |
185 | attr->u.kprobe.offset = ev->attr.probe.offset; | |
f3ed775e | 186 | strncpy(attr->u.kprobe.symbol_name, |
dbbb3ec5 DG |
187 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
188 | attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e DG |
189 | break; |
190 | case LTTNG_EVENT_FUNCTION: | |
8f0d098b MD |
191 | attr->instrumentation = LTTNG_KERNEL_KRETPROBE; |
192 | attr->u.kretprobe.addr = ev->attr.probe.addr; | |
193 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
194 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
195 | strncpy(attr->u.kretprobe.symbol_name, | |
dbbb3ec5 DG |
196 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
197 | attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
8f0d098b MD |
198 | break; |
199 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
f3ed775e DG |
200 | attr->instrumentation = LTTNG_KERNEL_FUNCTION; |
201 | strncpy(attr->u.ftrace.symbol_name, | |
dbbb3ec5 DG |
202 | ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
203 | attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 204 | break; |
e6ddca71 DG |
205 | case LTTNG_EVENT_TRACEPOINT: |
206 | attr->instrumentation = LTTNG_KERNEL_TRACEPOINT; | |
f3ed775e | 207 | break; |
a54bd42d MD |
208 | case LTTNG_EVENT_SYSCALL: |
209 | attr->instrumentation = LTTNG_KERNEL_SYSCALL; | |
0133c199 | 210 | break; |
7a3d1328 MD |
211 | case LTTNG_EVENT_ALL: |
212 | attr->instrumentation = LTTNG_KERNEL_ALL; | |
213 | break; | |
f3ed775e DG |
214 | default: |
215 | ERR("Unknown kernel instrumentation type (%d)", ev->type); | |
216 | goto error; | |
217 | } | |
218 | ||
219 | /* Copy event name */ | |
dbbb3ec5 DG |
220 | strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN); |
221 | attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 222 | |
54012638 DG |
223 | /* Setting up a kernel event */ |
224 | lke->fd = 0; | |
225 | lke->event = attr; | |
d36b8583 | 226 | lke->enabled = 1; |
e75cda3a | 227 | lke->ctx = NULL; |
54012638 DG |
228 | |
229 | return lke; | |
230 | ||
231 | error: | |
232 | return NULL; | |
233 | } | |
234 | ||
235 | /* | |
050349bb | 236 | * Allocate and initialize a kernel metadata. |
54012638 | 237 | * |
050349bb | 238 | * Return pointer to structure or NULL. |
54012638 | 239 | */ |
62499ad6 | 240 | struct ltt_kernel_metadata *trace_kernel_create_metadata(char *path) |
54012638 DG |
241 | { |
242 | int ret; | |
243 | struct ltt_kernel_metadata *lkm; | |
f3ed775e | 244 | struct lttng_channel *chan; |
54012638 | 245 | |
ba7f0ae5 DG |
246 | lkm = zmalloc(sizeof(struct ltt_kernel_metadata)); |
247 | chan = zmalloc(sizeof(struct lttng_channel)); | |
f3ed775e | 248 | if (lkm == NULL || chan == NULL) { |
df0f840b | 249 | PERROR("kernel metadata zmalloc"); |
54012638 DG |
250 | goto error; |
251 | } | |
252 | ||
253 | /* Set default attributes */ | |
f3ed775e | 254 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
b389abbe MD |
255 | chan->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE; |
256 | chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
f3ed775e DG |
257 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
258 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
7d452e12 | 259 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
54012638 DG |
260 | |
261 | /* Init metadata */ | |
262 | lkm->fd = 0; | |
f3ed775e | 263 | lkm->conf = chan; |
54012638 | 264 | /* Set default metadata path */ |
58a97671 | 265 | ret = asprintf(&lkm->pathname, "%s/metadata", path); |
54012638 | 266 | if (ret < 0) { |
df0f840b | 267 | PERROR("asprintf kernel metadata"); |
54012638 DG |
268 | goto error; |
269 | } | |
270 | ||
271 | return lkm; | |
272 | ||
273 | error: | |
274 | return NULL; | |
275 | } | |
276 | ||
277 | /* | |
050349bb DG |
278 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by |
279 | * default. | |
54012638 | 280 | * |
050349bb | 281 | * Return pointer to structure or NULL. |
54012638 | 282 | */ |
62499ad6 | 283 | struct ltt_kernel_stream *trace_kernel_create_stream(void) |
54012638 DG |
284 | { |
285 | struct ltt_kernel_stream *lks; | |
286 | ||
ba7f0ae5 | 287 | lks = zmalloc(sizeof(struct ltt_kernel_stream)); |
54012638 | 288 | if (lks == NULL) { |
df0f840b | 289 | PERROR("kernel stream zmalloc"); |
54012638 DG |
290 | goto error; |
291 | } | |
292 | ||
293 | /* Init stream */ | |
294 | lks->fd = 0; | |
295 | lks->pathname = NULL; | |
296 | lks->state = 0; | |
297 | ||
298 | return lks; | |
299 | ||
300 | error: | |
301 | return NULL; | |
302 | } | |
c363b55d | 303 | |
050349bb DG |
304 | /* |
305 | * Cleanup kernel stream structure. | |
306 | */ | |
62499ad6 | 307 | void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream) |
c363b55d | 308 | { |
799e2c4f MD |
309 | int ret; |
310 | ||
33a2b854 | 311 | DBG("[trace] Closing stream fd %d", stream->fd); |
c363b55d | 312 | /* Close kernel fd */ |
799e2c4f MD |
313 | ret = close(stream->fd); |
314 | if (ret) { | |
315 | PERROR("close"); | |
316 | } | |
c363b55d DG |
317 | /* Remove from stream list */ |
318 | cds_list_del(&stream->list); | |
f9815039 DG |
319 | |
320 | free(stream->pathname); | |
c363b55d DG |
321 | free(stream); |
322 | } | |
323 | ||
050349bb DG |
324 | /* |
325 | * Cleanup kernel event structure. | |
326 | */ | |
62499ad6 | 327 | void trace_kernel_destroy_event(struct ltt_kernel_event *event) |
c363b55d | 328 | { |
799e2c4f MD |
329 | int ret; |
330 | ||
87eb4ab8 MD |
331 | if (event->fd >= 0) { |
332 | DBG("[trace] Closing event fd %d", event->fd); | |
333 | /* Close kernel fd */ | |
799e2c4f MD |
334 | ret = close(event->fd); |
335 | if (ret) { | |
336 | PERROR("close"); | |
337 | } | |
87eb4ab8 MD |
338 | } else { |
339 | DBG("[trace] Tearing down event (no associated fd)"); | |
340 | } | |
c363b55d DG |
341 | |
342 | /* Remove from event list */ | |
343 | cds_list_del(&event->list); | |
f9815039 DG |
344 | |
345 | free(event->event); | |
346 | free(event->ctx); | |
c363b55d DG |
347 | free(event); |
348 | } | |
349 | ||
050349bb DG |
350 | /* |
351 | * Cleanup kernel channel structure. | |
352 | */ | |
62499ad6 | 353 | void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel) |
c363b55d | 354 | { |
af9737e9 DG |
355 | struct ltt_kernel_stream *stream, *stmp; |
356 | struct ltt_kernel_event *event, *etmp; | |
799e2c4f | 357 | int ret; |
c363b55d | 358 | |
33a2b854 | 359 | DBG("[trace] Closing channel fd %d", channel->fd); |
c363b55d | 360 | /* Close kernel fd */ |
799e2c4f MD |
361 | ret = close(channel->fd); |
362 | if (ret) { | |
363 | PERROR("close"); | |
364 | } | |
c363b55d DG |
365 | |
366 | /* For each stream in the channel list */ | |
af9737e9 | 367 | cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) { |
62499ad6 | 368 | trace_kernel_destroy_stream(stream); |
c363b55d DG |
369 | } |
370 | ||
371 | /* For each event in the channel list */ | |
af9737e9 | 372 | cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) { |
62499ad6 | 373 | trace_kernel_destroy_event(event); |
c363b55d DG |
374 | } |
375 | ||
376 | /* Remove from channel list */ | |
377 | cds_list_del(&channel->list); | |
f9815039 DG |
378 | |
379 | free(channel->pathname); | |
380 | free(channel->channel); | |
381 | free(channel->ctx); | |
c363b55d DG |
382 | free(channel); |
383 | } | |
384 | ||
050349bb DG |
385 | /* |
386 | * Cleanup kernel metadata structure. | |
387 | */ | |
62499ad6 | 388 | void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata) |
c363b55d | 389 | { |
799e2c4f MD |
390 | int ret; |
391 | ||
33a2b854 | 392 | DBG("[trace] Closing metadata fd %d", metadata->fd); |
c363b55d | 393 | /* Close kernel fd */ |
799e2c4f MD |
394 | ret = close(metadata->fd); |
395 | if (ret) { | |
396 | PERROR("close"); | |
397 | } | |
c363b55d | 398 | |
f9815039 DG |
399 | free(metadata->conf); |
400 | free(metadata->pathname); | |
c363b55d DG |
401 | free(metadata); |
402 | } | |
403 | ||
050349bb | 404 | /* |
62499ad6 | 405 | * Cleanup kernel session structure |
050349bb | 406 | */ |
62499ad6 | 407 | void trace_kernel_destroy_session(struct ltt_kernel_session *session) |
c363b55d | 408 | { |
af9737e9 | 409 | struct ltt_kernel_channel *channel, *ctmp; |
799e2c4f | 410 | int ret; |
c363b55d | 411 | |
33a2b854 | 412 | DBG("[trace] Closing session fd %d", session->fd); |
c363b55d | 413 | /* Close kernel fds */ |
799e2c4f MD |
414 | ret = close(session->fd); |
415 | if (ret) { | |
416 | PERROR("close"); | |
417 | } | |
f9815039 | 418 | |
70dc1c34 DG |
419 | if (session->metadata_stream_fd != 0) { |
420 | DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd); | |
799e2c4f MD |
421 | ret = close(session->metadata_stream_fd); |
422 | if (ret) { | |
423 | PERROR("close"); | |
424 | } | |
70dc1c34 | 425 | } |
c363b55d | 426 | |
d36b8583 | 427 | if (session->metadata != NULL) { |
62499ad6 | 428 | trace_kernel_destroy_metadata(session->metadata); |
d36b8583 | 429 | } |
c363b55d | 430 | |
af9737e9 | 431 | cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) { |
62499ad6 | 432 | trace_kernel_destroy_channel(channel); |
c363b55d DG |
433 | } |
434 | ||
f9815039 | 435 | free(session->trace_path); |
c363b55d DG |
436 | free(session); |
437 | } |