Implement enable all vs enable tracepoints vs enable syscalls
[lttng-tools.git] / ltt-sessiond / trace-kernel.c
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
6 * as published by the Free Software Foundation; only version 2
7 * of the License.
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>
23 #include <unistd.h>
24
25 #include <lttngerr.h>
26
27 #include "trace-kernel.h"
28
29 /*
30 * Find the channel name for the given kernel session.
31 */
32 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
33 char *name, struct ltt_kernel_session *session)
34 {
35 struct ltt_kernel_channel *chan;
36
37 if (session == NULL) {
38 ERR("Undefine session");
39 goto error;
40 }
41
42 DBG("Trying to find channel %s", name);
43
44 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
45 if (strcmp(name, chan->channel->name) == 0) {
46 DBG("Found channel by name %s", name);
47 return chan;
48 }
49 }
50
51 error:
52 return NULL;
53 }
54
55 /*
56 * Find the event name for the given channel.
57 */
58 struct ltt_kernel_event *trace_kernel_get_event_by_name(
59 char *name, struct ltt_kernel_channel *channel)
60 {
61 struct ltt_kernel_event *ev;
62
63 if (channel == NULL) {
64 ERR("Undefine channel");
65 goto error;
66 }
67
68 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
69 if (strcmp(name, ev->event->name) == 0) {
70 DBG("Found event by name %s for channel %s", name,
71 channel->channel->name);
72 return ev;
73 }
74 }
75
76 error:
77 return NULL;
78 }
79
80 /*
81 * Allocate and initialize a kernel session data structure.
82 *
83 * Return pointer to structure or NULL.
84 */
85 struct ltt_kernel_session *trace_kernel_create_session(char *path)
86 {
87 int ret;
88 struct ltt_kernel_session *lks;
89
90 /* Allocate a new ltt kernel session */
91 lks = malloc(sizeof(struct ltt_kernel_session));
92 if (lks == NULL) {
93 perror("create kernel session malloc");
94 goto error;
95 }
96
97 /* Init data structure */
98 lks->fd = 0;
99 lks->metadata_stream_fd = 0;
100 lks->channel_count = 0;
101 lks->stream_count_global = 0;
102 lks->metadata = NULL;
103 lks->consumer_fd = 0;
104 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
105
106 /* Set session path */
107 ret = asprintf(&lks->trace_path, "%s/kernel", path);
108 if (ret < 0) {
109 perror("asprintf kernel traces path");
110 goto error;
111 }
112
113 return lks;
114
115 error:
116 return NULL;
117 }
118
119 /*
120 * Allocate and initialize a kernel channel data structure.
121 *
122 * Return pointer to structure or NULL.
123 */
124 struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path)
125 {
126 int ret;
127 struct ltt_kernel_channel *lkc;
128
129 lkc = malloc(sizeof(struct ltt_kernel_channel));
130 if (lkc == NULL) {
131 perror("ltt_kernel_channel malloc");
132 goto error;
133 }
134
135 lkc->channel = malloc(sizeof(struct lttng_channel));
136 if (lkc->channel == NULL) {
137 perror("lttng_channel malloc");
138 goto error;
139 }
140 memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
141
142 lkc->fd = 0;
143 lkc->stream_count = 0;
144 lkc->event_count = 0;
145 lkc->enabled = 1;
146 lkc->ctx = NULL;
147 /* Init linked list */
148 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
149 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
150 /* Set default trace output path */
151 ret = asprintf(&lkc->pathname, "%s", path);
152 if (ret < 0) {
153 perror("asprintf kernel create channel");
154 goto error;
155 }
156
157 return lkc;
158
159 error:
160 return NULL;
161 }
162
163 /*
164 * Allocate and initialize a kernel event. Set name and event type.
165 *
166 * Return pointer to structure or NULL.
167 */
168 struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev)
169 {
170 struct ltt_kernel_event *lke;
171 struct lttng_kernel_event *attr;
172
173 lke = malloc(sizeof(struct ltt_kernel_event));
174 attr = malloc(sizeof(struct lttng_kernel_event));
175 if (lke == NULL || attr == NULL) {
176 perror("kernel event malloc");
177 goto error;
178 }
179
180 switch (ev->type) {
181 case LTTNG_EVENT_PROBE:
182 attr->instrumentation = LTTNG_KERNEL_KPROBE;
183 attr->u.kprobe.addr = ev->attr.probe.addr;
184 attr->u.kprobe.offset = ev->attr.probe.offset;
185 strncpy(attr->u.kprobe.symbol_name,
186 ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
187 attr->u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
188 break;
189 case LTTNG_EVENT_FUNCTION:
190 attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
191 attr->u.kretprobe.addr = ev->attr.probe.addr;
192 attr->u.kretprobe.offset = ev->attr.probe.offset;
193 attr->u.kretprobe.offset = ev->attr.probe.offset;
194 strncpy(attr->u.kretprobe.symbol_name,
195 ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
196 attr->u.kretprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
197 break;
198 case LTTNG_EVENT_FUNCTION_ENTRY:
199 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
200 strncpy(attr->u.ftrace.symbol_name,
201 ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN);
202 attr->u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
203 break;
204 case LTTNG_EVENT_TRACEPOINT:
205 attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
206 break;
207 case LTTNG_EVENT_SYSCALL:
208 attr->instrumentation = LTTNG_KERNEL_SYSCALL;
209 break;
210 case LTTNG_EVENT_ALL:
211 attr->instrumentation = LTTNG_KERNEL_ALL;
212 break;
213 default:
214 ERR("Unknown kernel instrumentation type (%d)", ev->type);
215 goto error;
216 }
217
218 /* Copy event name */
219 strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN);
220 attr->name[LTTNG_SYM_NAME_LEN - 1] = '\0';
221
222 /* Setting up a kernel event */
223 lke->fd = 0;
224 lke->event = attr;
225 lke->enabled = 1;
226 lke->ctx = NULL;
227
228 return lke;
229
230 error:
231 return NULL;
232 }
233
234 /*
235 * Allocate and initialize a kernel metadata.
236 *
237 * Return pointer to structure or NULL.
238 */
239 struct ltt_kernel_metadata *trace_kernel_create_metadata(char *path)
240 {
241 int ret;
242 struct ltt_kernel_metadata *lkm;
243 struct lttng_channel *chan;
244
245 lkm = malloc(sizeof(struct ltt_kernel_metadata));
246 chan = malloc(sizeof(struct lttng_channel));
247 if (lkm == NULL || chan == NULL) {
248 perror("kernel metadata malloc");
249 goto error;
250 }
251
252 /* Set default attributes */
253 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
254 chan->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
255 chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
256 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
257 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
258 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
259
260 /* Init metadata */
261 lkm->fd = 0;
262 lkm->conf = chan;
263 /* Set default metadata path */
264 ret = asprintf(&lkm->pathname, "%s/metadata", path);
265 if (ret < 0) {
266 perror("asprintf kernel metadata");
267 goto error;
268 }
269
270 return lkm;
271
272 error:
273 return NULL;
274 }
275
276 /*
277 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
278 * default.
279 *
280 * Return pointer to structure or NULL.
281 */
282 struct ltt_kernel_stream *trace_kernel_create_stream(void)
283 {
284 struct ltt_kernel_stream *lks;
285
286 lks = malloc(sizeof(struct ltt_kernel_stream));
287 if (lks == NULL) {
288 perror("kernel stream malloc");
289 goto error;
290 }
291
292 /* Init stream */
293 lks->fd = 0;
294 lks->pathname = NULL;
295 lks->state = 0;
296
297 return lks;
298
299 error:
300 return NULL;
301 }
302
303 /*
304 * Cleanup kernel stream structure.
305 */
306 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
307 {
308 DBG("[trace] Closing stream fd %d", stream->fd);
309 /* Close kernel fd */
310 close(stream->fd);
311 /* Remove from stream list */
312 cds_list_del(&stream->list);
313
314 free(stream->pathname);
315 free(stream);
316 }
317
318 /*
319 * Cleanup kernel event structure.
320 */
321 void trace_kernel_destroy_event(struct ltt_kernel_event *event)
322 {
323 DBG("[trace] Closing event fd %d", event->fd);
324 /* Close kernel fd */
325 close(event->fd);
326
327 /* Remove from event list */
328 cds_list_del(&event->list);
329
330 free(event->event);
331 free(event->ctx);
332 free(event);
333 }
334
335 /*
336 * Cleanup kernel channel structure.
337 */
338 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
339 {
340 struct ltt_kernel_stream *stream, *stmp;
341 struct ltt_kernel_event *event, *etmp;
342
343 DBG("[trace] Closing channel fd %d", channel->fd);
344 /* Close kernel fd */
345 close(channel->fd);
346
347 /* For each stream in the channel list */
348 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
349 trace_kernel_destroy_stream(stream);
350 }
351
352 /* For each event in the channel list */
353 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
354 trace_kernel_destroy_event(event);
355 }
356
357 /* Remove from channel list */
358 cds_list_del(&channel->list);
359
360 free(channel->pathname);
361 free(channel->channel);
362 free(channel->ctx);
363 free(channel);
364 }
365
366 /*
367 * Cleanup kernel metadata structure.
368 */
369 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
370 {
371 DBG("[trace] Closing metadata fd %d", metadata->fd);
372 /* Close kernel fd */
373 close(metadata->fd);
374
375 free(metadata->conf);
376 free(metadata->pathname);
377 free(metadata);
378 }
379
380 /*
381 * Cleanup kernel session structure
382 */
383 void trace_kernel_destroy_session(struct ltt_kernel_session *session)
384 {
385 struct ltt_kernel_channel *channel, *ctmp;
386
387 DBG("[trace] Closing session fd %d", session->fd);
388 /* Close kernel fds */
389 close(session->fd);
390
391 if (session->metadata_stream_fd != 0) {
392 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
393 close(session->metadata_stream_fd);
394 }
395
396 if (session->metadata != NULL) {
397 trace_kernel_destroy_metadata(session->metadata);
398 }
399
400 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
401 trace_kernel_destroy_channel(channel);
402 }
403
404 free(session->trace_path);
405 free(session);
406 }
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