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20fe2104 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 | |
6 | * as published by the Free Software Foundation; either version 2 | |
7 | * of the License, or (at your option) any later version. | |
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 | ||
8c0faa1d | 19 | #define _GNU_SOURCE |
20fe2104 DG |
20 | #include <errno.h> |
21 | #include <stdlib.h> | |
22 | #include <stdio.h> | |
f34daff7 | 23 | #include <string.h> |
8c0faa1d | 24 | #include <unistd.h> |
20fe2104 | 25 | |
8c0faa1d | 26 | #include "lttngerr.h" |
20fe2104 DG |
27 | #include "ltt-sessiond.h" |
28 | #include "libkernelctl.h" | |
29 | #include "kernel-ctl.h" | |
30 | #include "trace.h" | |
31 | ||
32 | /* | |
33 | * kernel_create_session | |
34 | * | |
35 | * Create a new kernel session using the command context session. | |
36 | */ | |
8c0faa1d | 37 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
38 | { |
39 | int ret; | |
40 | struct ltt_kernel_session *lks; | |
41 | ||
42 | /* Allocate a new kernel session */ | |
43 | lks = malloc(sizeof(struct ltt_kernel_session)); | |
44 | if (lks == NULL) { | |
45 | perror("kernel session malloc"); | |
46 | ret = -errno; | |
47 | goto error; | |
48 | } | |
49 | ||
50 | ret = kernctl_create_session(tracer_fd); | |
51 | if (ret < 0) { | |
52 | goto error; | |
53 | } | |
54 | ||
55 | /* Assigning session fd and to the command context */ | |
56 | lks->fd = ret; | |
8c0faa1d DG |
57 | lks->channel_count = 0; |
58 | lks->stream_count_global = 0; | |
59 | session->kernel_session = lks; | |
60 | session->kern_session_count++; | |
61 | CDS_INIT_LIST_HEAD(&lks->channel_list.head); | |
62 | ||
63 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
64 | |
65 | return 0; | |
66 | ||
67 | error: | |
68 | return ret; | |
69 | } | |
70 | ||
71 | /* | |
72 | * kernel_create_channel | |
73 | * | |
74 | * Create a kernel channel within the kernel session. | |
75 | */ | |
8c0faa1d | 76 | int kernel_create_channel(struct ltt_kernel_session *session) |
20fe2104 DG |
77 | { |
78 | int ret; | |
79 | struct ltt_kernel_channel *lkc; | |
9cb98350 | 80 | struct lttng_kernel_channel *chan; |
20fe2104 DG |
81 | |
82 | lkc = malloc(sizeof(struct ltt_kernel_channel)); | |
9cb98350 | 83 | chan = malloc(sizeof(struct lttng_kernel_channel)); |
20fe2104 DG |
84 | |
85 | if (lkc == NULL || chan == NULL) { | |
86 | perror("kernel channel malloc"); | |
87 | ret = -errno; | |
88 | goto error; | |
89 | } | |
90 | ||
91 | chan->overwrite = DEFAULT_KERNEL_OVERWRITE; | |
92 | chan->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE; | |
93 | chan->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM; | |
94 | chan->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER; | |
95 | chan->read_timer_interval = DEFAULT_KERNEL_READ_TIMER; | |
96 | ||
8c0faa1d | 97 | ret = kernctl_create_channel(session->fd, chan); |
20fe2104 | 98 | if (ret < 0) { |
aaf26714 | 99 | perror("ioctl create channel"); |
20fe2104 DG |
100 | goto error; |
101 | } | |
102 | ||
8c0faa1d | 103 | /* Setup the channel */ |
20fe2104 DG |
104 | lkc->fd = ret; |
105 | lkc->channel = chan; | |
8c0faa1d DG |
106 | lkc->stream_count = 0; |
107 | ret = asprintf(&lkc->pathname, "%s", DEFAULT_TRACE_OUTPUT); | |
108 | if (ret < 0) { | |
109 | perror("asprintf kernel create channel"); | |
110 | goto error; | |
111 | } | |
112 | ||
113 | DBG("Channel path set to %s", lkc->pathname); | |
114 | ||
20fe2104 | 115 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); |
8c0faa1d DG |
116 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); |
117 | cds_list_add(&lkc->list, &session->channel_list.head); | |
118 | session->channel_count++; | |
20fe2104 | 119 | |
8c0faa1d | 120 | DBG("Kernel channel created (fd: %d)", lkc->fd); |
20fe2104 DG |
121 | |
122 | return 0; | |
123 | ||
124 | error: | |
125 | return ret; | |
126 | } | |
f34daff7 DG |
127 | |
128 | /* | |
129 | * kernel_enable_event | |
130 | * | |
131 | * Enable kernel event. | |
132 | */ | |
8c0faa1d | 133 | int kernel_enable_event(struct ltt_kernel_session *session, char *name) |
f34daff7 DG |
134 | { |
135 | int ret; | |
8c0faa1d | 136 | struct ltt_kernel_channel *chan; |
f34daff7 DG |
137 | struct ltt_kernel_event *event; |
138 | struct lttng_kernel_event *lke; | |
139 | ||
140 | event = malloc(sizeof(struct ltt_kernel_event)); | |
141 | lke = malloc(sizeof(struct lttng_kernel_event)); | |
142 | ||
143 | if (event == NULL || lke == NULL) { | |
144 | perror("kernel enable event malloc"); | |
145 | ret = -errno; | |
146 | goto error; | |
147 | } | |
148 | ||
149 | /* Setting up a kernel event */ | |
150 | strncpy(lke->name, name, LTTNG_SYM_NAME_LEN); | |
151 | lke->instrumentation = LTTNG_KERNEL_TRACEPOINTS; | |
152 | event->event = lke; | |
153 | ||
8c0faa1d DG |
154 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
155 | ret = kernctl_create_event(chan->fd, lke); | |
156 | if (ret < 0) { | |
157 | goto error; | |
158 | } | |
f34daff7 | 159 | |
8c0faa1d DG |
160 | event->fd = ret; |
161 | /* Add event to event list */ | |
162 | cds_list_add(&event->list, &chan->events_list.head); | |
163 | DBG("Event %s enabled (fd: %d)", name, event->fd); | |
164 | } | |
f34daff7 DG |
165 | |
166 | return 0; | |
167 | ||
168 | error: | |
169 | return ret; | |
170 | } | |
aaf26714 DG |
171 | |
172 | /* | |
173 | * kernel_open_metadata | |
174 | * | |
175 | * Open metadata stream. | |
176 | */ | |
177 | int kernel_open_metadata(struct ltt_kernel_session *session) | |
178 | { | |
179 | int ret; | |
180 | struct ltt_kernel_metadata *lkm; | |
181 | struct lttng_kernel_channel *conf; | |
182 | ||
183 | lkm = malloc(sizeof(struct ltt_kernel_metadata)); | |
184 | conf = malloc(sizeof(struct lttng_kernel_channel)); | |
185 | ||
186 | if (lkm == NULL || conf == NULL) { | |
187 | perror("kernel open metadata malloc"); | |
188 | ret = -errno; | |
189 | goto error; | |
190 | } | |
191 | ||
192 | conf->overwrite = DEFAULT_KERNEL_OVERWRITE; | |
193 | conf->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE; | |
194 | conf->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM; | |
195 | conf->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER; | |
196 | conf->read_timer_interval = DEFAULT_KERNEL_READ_TIMER; | |
197 | ||
198 | ret = kernctl_open_metadata(session->fd, conf); | |
199 | if (ret < 0) { | |
200 | goto error; | |
201 | } | |
202 | ||
8c0faa1d DG |
203 | lkm->fd = ret; |
204 | lkm->conf = conf; | |
205 | ret = asprintf(&lkm->pathname, "%s/metadata", DEFAULT_TRACE_OUTPUT); | |
206 | if (ret < 0) { | |
207 | perror("asprintf kernel metadata"); | |
208 | goto error; | |
209 | } | |
aaf26714 | 210 | session->metadata = lkm; |
8c0faa1d DG |
211 | |
212 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); | |
213 | ||
214 | return 0; | |
215 | ||
216 | error: | |
217 | return ret; | |
218 | } | |
219 | ||
220 | /* | |
221 | * kernel_start_session | |
222 | * | |
223 | * Start tracing session. | |
224 | */ | |
225 | int kernel_start_session(struct ltt_kernel_session *session) | |
226 | { | |
227 | int ret; | |
228 | ||
229 | ret = kernctl_start_session(session->fd); | |
230 | if (ret < 0) { | |
231 | goto error; | |
232 | } | |
233 | ||
234 | DBG("Kernel session started"); | |
235 | ||
236 | return 0; | |
237 | ||
238 | error: | |
239 | return ret; | |
240 | } | |
241 | ||
242 | /* | |
243 | * kernel_stop_session | |
244 | * | |
245 | * Stop tracing session. | |
246 | */ | |
247 | int kernel_stop_session(struct ltt_kernel_session *session) | |
248 | { | |
249 | int ret; | |
250 | ||
251 | ret = kernctl_stop_session(session->fd); | |
252 | if (ret < 0) { | |
253 | goto error; | |
254 | } | |
255 | ||
256 | DBG("Kernel session stopped"); | |
257 | ||
258 | return 0; | |
259 | ||
260 | error: | |
261 | return ret; | |
262 | } | |
263 | ||
264 | /* | |
265 | * kernel_create_channel_stream | |
266 | * | |
267 | * Create a stream for a channel. | |
268 | * | |
269 | * Return the number of created stream. Else, a negative value. | |
270 | */ | |
271 | int kernel_create_channel_stream(struct ltt_kernel_channel *channel) | |
272 | { | |
273 | int ret; | |
274 | struct ltt_kernel_stream *lks; | |
275 | ||
276 | while ((ret = kernctl_create_stream(channel->fd)) > 0) { | |
277 | lks = malloc(sizeof(struct ltt_kernel_stream)); | |
278 | if (lks == NULL) { | |
279 | perror("kernel create stream malloc"); | |
280 | ret = -errno; | |
281 | goto error; | |
282 | } | |
283 | ||
284 | lks->fd = ret; | |
285 | ret = asprintf(&lks->pathname, "%s/trace_%d", | |
286 | channel->pathname, channel->stream_count); | |
287 | if (ret < 0) { | |
288 | perror("asprintf kernel create stream"); | |
289 | goto error; | |
290 | } | |
291 | lks->state = 0; | |
292 | ||
293 | cds_list_add(&lks->list, &channel->stream_list.head); | |
294 | channel->stream_count++; | |
295 | } | |
296 | ||
297 | DBG("Kernel channel stream created (num: %d)", channel->stream_count); | |
298 | ||
299 | return channel->stream_count; | |
300 | ||
301 | error: | |
302 | return ret; | |
303 | } | |
304 | ||
305 | /* | |
306 | * kernel_create_metadata_stream | |
307 | * | |
308 | * Create the metadata stream. | |
309 | */ | |
310 | int kernel_create_metadata_stream(struct ltt_kernel_session *session) | |
311 | { | |
312 | int ret; | |
313 | ||
314 | ret = kernctl_create_stream(session->metadata->fd); | |
315 | if (ret < 0) { | |
316 | perror("kernel create metadata stream"); | |
317 | ret = -errno; | |
318 | goto error; | |
319 | } | |
320 | ||
321 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
322 | session->metadata_stream_fd = ret; | |
aaf26714 DG |
323 | |
324 | return 0; | |
325 | ||
326 | error: | |
327 | return ret; | |
328 | } |