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 | |
10a8a223 | 25 | #include <common/lttngerr.h> |
990570ed DG |
26 | #include <common/common.h> |
27 | #include <common/defaults.h> | |
1e307fab | 28 | |
62499ad6 | 29 | #include "trace-kernel.h" |
54012638 | 30 | |
19e70852 | 31 | /* |
050349bb | 32 | * Find the channel name for the given kernel session. |
19e70852 | 33 | */ |
62499ad6 | 34 | struct ltt_kernel_channel *trace_kernel_get_channel_by_name( |
19e70852 DG |
35 | char *name, struct ltt_kernel_session *session) |
36 | { | |
37 | struct ltt_kernel_channel *chan; | |
38 | ||
39 | if (session == NULL) { | |
40 | ERR("Undefine session"); | |
41 | goto error; | |
42 | } | |
43 | ||
54d01ffb DG |
44 | DBG("Trying to find channel %s", name); |
45 | ||
19e70852 DG |
46 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
47 | if (strcmp(name, chan->channel->name) == 0) { | |
48 | DBG("Found channel by name %s", name); | |
49 | return chan; | |
50 | } | |
51 | } | |
52 | ||
53 | error: | |
54 | return NULL; | |
55 | } | |
56 | ||
57 | /* | |
050349bb | 58 | * Find the event name for the given channel. |
19e70852 | 59 | */ |
62499ad6 | 60 | struct ltt_kernel_event *trace_kernel_get_event_by_name( |
19e70852 DG |
61 | char *name, struct ltt_kernel_channel *channel) |
62 | { | |
63 | struct ltt_kernel_event *ev; | |
64 | ||
65 | if (channel == NULL) { | |
66 | ERR("Undefine channel"); | |
67 | goto error; | |
68 | } | |
69 | ||
70 | cds_list_for_each_entry(ev, &channel->events_list.head, list) { | |
71 | if (strcmp(name, ev->event->name) == 0) { | |
72 | DBG("Found event by name %s for channel %s", name, | |
73 | channel->channel->name); | |
74 | return ev; | |
75 | } | |
76 | } | |
77 | ||
78 | error: | |
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 | */ |
f9815039 | 87 | struct ltt_kernel_session *trace_kernel_create_session(char *path) |
54012638 | 88 | { |
f9815039 | 89 | int ret; |
54012638 DG |
90 | struct ltt_kernel_session *lks; |
91 | ||
92 | /* Allocate a new ltt kernel session */ | |
ba7f0ae5 | 93 | lks = zmalloc(sizeof(struct ltt_kernel_session)); |
54012638 | 94 | if (lks == NULL) { |
ba7f0ae5 | 95 | perror("create kernel session zmalloc"); |
54012638 DG |
96 | goto error; |
97 | } | |
98 | ||
99 | /* Init data structure */ | |
100 | lks->fd = 0; | |
101 | lks->metadata_stream_fd = 0; | |
102 | lks->channel_count = 0; | |
103 | lks->stream_count_global = 0; | |
104 | lks->metadata = NULL; | |
d9800920 | 105 | lks->consumer_fd = 0; |
54012638 DG |
106 | CDS_INIT_LIST_HEAD(&lks->channel_list.head); |
107 | ||
f9815039 DG |
108 | /* Set session path */ |
109 | ret = asprintf(&lks->trace_path, "%s/kernel", path); | |
110 | if (ret < 0) { | |
111 | perror("asprintf kernel traces path"); | |
112 | goto error; | |
113 | } | |
114 | ||
54012638 DG |
115 | return lks; |
116 | ||
117 | error: | |
118 | return NULL; | |
119 | } | |
120 | ||
121 | /* | |
050349bb | 122 | * Allocate and initialize a kernel channel data structure. |
54012638 | 123 | * |
050349bb | 124 | * Return pointer to structure or NULL. |
54012638 | 125 | */ |
62499ad6 | 126 | struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path) |
54012638 DG |
127 | { |
128 | int ret; | |
129 | struct ltt_kernel_channel *lkc; | |
54012638 | 130 | |
ba7f0ae5 | 131 | lkc = zmalloc(sizeof(struct ltt_kernel_channel)); |
f3ed775e | 132 | if (lkc == NULL) { |
ba7f0ae5 | 133 | perror("ltt_kernel_channel zmalloc"); |
54012638 DG |
134 | goto error; |
135 | } | |
136 | ||
ba7f0ae5 | 137 | lkc->channel = zmalloc(sizeof(struct lttng_channel)); |
f3ed775e | 138 | if (lkc->channel == NULL) { |
ba7f0ae5 | 139 | perror("lttng_channel zmalloc"); |
f3ed775e DG |
140 | goto error; |
141 | } | |
142 | memcpy(lkc->channel, chan, sizeof(struct lttng_channel)); | |
54012638 DG |
143 | |
144 | lkc->fd = 0; | |
145 | lkc->stream_count = 0; | |
cbbbb275 | 146 | lkc->event_count = 0; |
d36b8583 | 147 | lkc->enabled = 1; |
e75cda3a | 148 | lkc->ctx = NULL; |
54012638 DG |
149 | /* Init linked list */ |
150 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); | |
151 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); | |
152 | /* Set default trace output path */ | |
b082db07 | 153 | ret = asprintf(&lkc->pathname, "%s", path); |
54012638 DG |
154 | if (ret < 0) { |
155 | perror("asprintf kernel create channel"); | |
156 | goto error; | |
157 | } | |
158 | ||
159 | return lkc; | |
160 | ||
161 | error: | |
162 | return NULL; | |
163 | } | |
164 | ||
165 | /* | |
050349bb | 166 | * Allocate and initialize a kernel event. Set name and event type. |
54012638 | 167 | * |
050349bb | 168 | * Return pointer to structure or NULL. |
54012638 | 169 | */ |
62499ad6 | 170 | struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev) |
54012638 DG |
171 | { |
172 | struct ltt_kernel_event *lke; | |
173 | struct lttng_kernel_event *attr; | |
174 | ||
ba7f0ae5 DG |
175 | lke = zmalloc(sizeof(struct ltt_kernel_event)); |
176 | attr = zmalloc(sizeof(struct lttng_kernel_event)); | |
54012638 | 177 | if (lke == NULL || attr == NULL) { |
ba7f0ae5 | 178 | perror("kernel event zmalloc"); |
54012638 DG |
179 | goto error; |
180 | } | |
181 | ||
f3ed775e | 182 | switch (ev->type) { |
7d29a247 | 183 | case LTTNG_EVENT_PROBE: |
e6ddca71 | 184 | attr->instrumentation = LTTNG_KERNEL_KPROBE; |
7d29a247 DG |
185 | attr->u.kprobe.addr = ev->attr.probe.addr; |
186 | attr->u.kprobe.offset = ev->attr.probe.offset; | |
f3ed775e | 187 | strncpy(attr->u.kprobe.symbol_name, |
7d29a247 | 188 | ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN); |
99497cd0 | 189 | attr->u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
f3ed775e DG |
190 | break; |
191 | case LTTNG_EVENT_FUNCTION: | |
8f0d098b MD |
192 | attr->instrumentation = LTTNG_KERNEL_KRETPROBE; |
193 | attr->u.kretprobe.addr = ev->attr.probe.addr; | |
194 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
195 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
196 | strncpy(attr->u.kretprobe.symbol_name, | |
197 | ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN); | |
99497cd0 | 198 | attr->u.kretprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
8f0d098b MD |
199 | break; |
200 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
f3ed775e DG |
201 | attr->instrumentation = LTTNG_KERNEL_FUNCTION; |
202 | strncpy(attr->u.ftrace.symbol_name, | |
203 | ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN); | |
99497cd0 | 204 | attr->u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
f3ed775e | 205 | break; |
e6ddca71 DG |
206 | case LTTNG_EVENT_TRACEPOINT: |
207 | attr->instrumentation = LTTNG_KERNEL_TRACEPOINT; | |
f3ed775e | 208 | break; |
a54bd42d MD |
209 | case LTTNG_EVENT_SYSCALL: |
210 | attr->instrumentation = LTTNG_KERNEL_SYSCALL; | |
0133c199 | 211 | break; |
7a3d1328 MD |
212 | case LTTNG_EVENT_ALL: |
213 | attr->instrumentation = LTTNG_KERNEL_ALL; | |
214 | break; | |
f3ed775e DG |
215 | default: |
216 | ERR("Unknown kernel instrumentation type (%d)", ev->type); | |
217 | goto error; | |
218 | } | |
219 | ||
220 | /* Copy event name */ | |
221 | strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN); | |
99497cd0 | 222 | attr->name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
f3ed775e | 223 | |
54012638 DG |
224 | /* Setting up a kernel event */ |
225 | lke->fd = 0; | |
226 | lke->event = attr; | |
d36b8583 | 227 | lke->enabled = 1; |
e75cda3a | 228 | lke->ctx = NULL; |
54012638 DG |
229 | |
230 | return lke; | |
231 | ||
232 | error: | |
233 | return NULL; | |
234 | } | |
235 | ||
236 | /* | |
050349bb | 237 | * Allocate and initialize a kernel metadata. |
54012638 | 238 | * |
050349bb | 239 | * Return pointer to structure or NULL. |
54012638 | 240 | */ |
62499ad6 | 241 | struct ltt_kernel_metadata *trace_kernel_create_metadata(char *path) |
54012638 DG |
242 | { |
243 | int ret; | |
244 | struct ltt_kernel_metadata *lkm; | |
f3ed775e | 245 | struct lttng_channel *chan; |
54012638 | 246 | |
ba7f0ae5 DG |
247 | lkm = zmalloc(sizeof(struct ltt_kernel_metadata)); |
248 | chan = zmalloc(sizeof(struct lttng_channel)); | |
f3ed775e | 249 | if (lkm == NULL || chan == NULL) { |
ba7f0ae5 | 250 | perror("kernel metadata zmalloc"); |
54012638 DG |
251 | goto error; |
252 | } | |
253 | ||
254 | /* Set default attributes */ | |
f3ed775e | 255 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
b389abbe MD |
256 | chan->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE; |
257 | chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
f3ed775e DG |
258 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
259 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
7d452e12 | 260 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
54012638 DG |
261 | |
262 | /* Init metadata */ | |
263 | lkm->fd = 0; | |
f3ed775e | 264 | lkm->conf = chan; |
54012638 | 265 | /* Set default metadata path */ |
58a97671 | 266 | ret = asprintf(&lkm->pathname, "%s/metadata", path); |
54012638 DG |
267 | if (ret < 0) { |
268 | perror("asprintf kernel metadata"); | |
269 | goto error; | |
270 | } | |
271 | ||
272 | return lkm; | |
273 | ||
274 | error: | |
275 | return NULL; | |
276 | } | |
277 | ||
278 | /* | |
050349bb DG |
279 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by |
280 | * default. | |
54012638 | 281 | * |
050349bb | 282 | * Return pointer to structure or NULL. |
54012638 | 283 | */ |
62499ad6 | 284 | struct ltt_kernel_stream *trace_kernel_create_stream(void) |
54012638 DG |
285 | { |
286 | struct ltt_kernel_stream *lks; | |
287 | ||
ba7f0ae5 | 288 | lks = zmalloc(sizeof(struct ltt_kernel_stream)); |
54012638 | 289 | if (lks == NULL) { |
ba7f0ae5 | 290 | perror("kernel stream zmalloc"); |
54012638 DG |
291 | goto error; |
292 | } | |
293 | ||
294 | /* Init stream */ | |
295 | lks->fd = 0; | |
296 | lks->pathname = NULL; | |
297 | lks->state = 0; | |
298 | ||
299 | return lks; | |
300 | ||
301 | error: | |
302 | return NULL; | |
303 | } | |
c363b55d | 304 | |
050349bb DG |
305 | /* |
306 | * Cleanup kernel stream structure. | |
307 | */ | |
62499ad6 | 308 | void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream) |
c363b55d | 309 | { |
33a2b854 | 310 | DBG("[trace] Closing stream fd %d", stream->fd); |
c363b55d DG |
311 | /* Close kernel fd */ |
312 | close(stream->fd); | |
c363b55d DG |
313 | /* Remove from stream list */ |
314 | cds_list_del(&stream->list); | |
f9815039 DG |
315 | |
316 | free(stream->pathname); | |
c363b55d DG |
317 | free(stream); |
318 | } | |
319 | ||
050349bb DG |
320 | /* |
321 | * Cleanup kernel event structure. | |
322 | */ | |
62499ad6 | 323 | void trace_kernel_destroy_event(struct ltt_kernel_event *event) |
c363b55d | 324 | { |
33a2b854 | 325 | DBG("[trace] Closing event fd %d", event->fd); |
c363b55d DG |
326 | /* Close kernel fd */ |
327 | close(event->fd); | |
c363b55d DG |
328 | |
329 | /* Remove from event list */ | |
330 | cds_list_del(&event->list); | |
f9815039 DG |
331 | |
332 | free(event->event); | |
333 | free(event->ctx); | |
c363b55d DG |
334 | free(event); |
335 | } | |
336 | ||
050349bb DG |
337 | /* |
338 | * Cleanup kernel channel structure. | |
339 | */ | |
62499ad6 | 340 | void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel) |
c363b55d | 341 | { |
af9737e9 DG |
342 | struct ltt_kernel_stream *stream, *stmp; |
343 | struct ltt_kernel_event *event, *etmp; | |
c363b55d | 344 | |
33a2b854 | 345 | DBG("[trace] Closing channel fd %d", channel->fd); |
c363b55d DG |
346 | /* Close kernel fd */ |
347 | close(channel->fd); | |
c363b55d DG |
348 | |
349 | /* For each stream in the channel list */ | |
af9737e9 | 350 | cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) { |
62499ad6 | 351 | trace_kernel_destroy_stream(stream); |
c363b55d DG |
352 | } |
353 | ||
354 | /* For each event in the channel list */ | |
af9737e9 | 355 | cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) { |
62499ad6 | 356 | trace_kernel_destroy_event(event); |
c363b55d DG |
357 | } |
358 | ||
359 | /* Remove from channel list */ | |
360 | cds_list_del(&channel->list); | |
f9815039 DG |
361 | |
362 | free(channel->pathname); | |
363 | free(channel->channel); | |
364 | free(channel->ctx); | |
c363b55d DG |
365 | free(channel); |
366 | } | |
367 | ||
050349bb DG |
368 | /* |
369 | * Cleanup kernel metadata structure. | |
370 | */ | |
62499ad6 | 371 | void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata) |
c363b55d | 372 | { |
33a2b854 | 373 | DBG("[trace] Closing metadata fd %d", metadata->fd); |
c363b55d DG |
374 | /* Close kernel fd */ |
375 | close(metadata->fd); | |
c363b55d | 376 | |
f9815039 DG |
377 | free(metadata->conf); |
378 | free(metadata->pathname); | |
c363b55d DG |
379 | free(metadata); |
380 | } | |
381 | ||
050349bb | 382 | /* |
62499ad6 | 383 | * Cleanup kernel session structure |
050349bb | 384 | */ |
62499ad6 | 385 | void trace_kernel_destroy_session(struct ltt_kernel_session *session) |
c363b55d | 386 | { |
af9737e9 | 387 | struct ltt_kernel_channel *channel, *ctmp; |
c363b55d | 388 | |
33a2b854 | 389 | DBG("[trace] Closing session fd %d", session->fd); |
c363b55d DG |
390 | /* Close kernel fds */ |
391 | close(session->fd); | |
f9815039 | 392 | |
70dc1c34 DG |
393 | if (session->metadata_stream_fd != 0) { |
394 | DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd); | |
395 | close(session->metadata_stream_fd); | |
396 | } | |
c363b55d | 397 | |
d36b8583 | 398 | if (session->metadata != NULL) { |
62499ad6 | 399 | trace_kernel_destroy_metadata(session->metadata); |
d36b8583 | 400 | } |
c363b55d | 401 | |
af9737e9 | 402 | cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) { |
62499ad6 | 403 | trace_kernel_destroy_channel(channel); |
c363b55d DG |
404 | } |
405 | ||
f9815039 | 406 | free(session->trace_path); |
c363b55d DG |
407 | free(session); |
408 | } |