Commit | Line | Data |
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54d01ffb 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 modify it | |
5 | * under the terms of the GNU General Public License as published by the Free | |
6 | * Software Foundation; only version 2 of the License. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
16 | */ | |
17 | ||
d87bfb32 | 18 | #include <errno.h> |
54d01ffb | 19 | #include <urcu/list.h> |
2bdd86d4 | 20 | #include <string.h> |
54d01ffb DG |
21 | |
22 | #include <lttng/lttng.h> | |
23 | #include <lttng-sessiond-comm.h> | |
24 | #include <lttngerr.h> | |
25 | ||
2bdd86d4 MD |
26 | #ifdef CONFIG_LTTNG_TOOLS_HAVE_UST |
27 | #include <ust/lttng-ust-ctl.h> | |
28 | #else | |
29 | #include "lttng-ust-ctl.h" | |
30 | #endif | |
31 | ||
54d01ffb DG |
32 | #include "channel.h" |
33 | #include "event.h" | |
34 | #include "kernel-ctl.h" | |
35 | ||
8c9ae521 DG |
36 | /* |
37 | * Setup a lttng_event used to enable *all* syscall tracing. | |
38 | */ | |
39 | static void init_syscalls_kernel_event(struct lttng_event *event) | |
40 | { | |
41 | event->name[0] = '\0'; | |
42 | /* | |
43 | * We use LTTNG_EVENT* here since the trace kernel creation will make the | |
44 | * right changes for the kernel. | |
45 | */ | |
46 | event->type = LTTNG_EVENT_SYSCALL; | |
47 | } | |
48 | ||
54d01ffb | 49 | /* |
7a3d1328 | 50 | * Disable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 51 | */ |
7a3d1328 | 52 | int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
53 | struct ltt_kernel_channel *kchan, char *event_name) |
54 | { | |
55 | int ret; | |
56 | struct ltt_kernel_event *kevent; | |
57 | ||
58 | kevent = trace_kernel_get_event_by_name(event_name, kchan); | |
59 | if (kevent == NULL) { | |
60 | ret = LTTCOMM_NO_EVENT; | |
61 | goto error; | |
62 | } | |
63 | ||
64 | ret = kernel_disable_event(kevent); | |
65 | if (ret < 0) { | |
66 | ret = LTTCOMM_KERN_DISABLE_FAIL; | |
67 | goto error; | |
68 | } | |
69 | ||
70 | DBG("Kernel event %s disable for channel %s.", | |
71 | kevent->event->name, kchan->channel->name); | |
72 | ||
73 | ret = LTTCOMM_OK; | |
74 | ||
75 | error: | |
76 | return ret; | |
77 | } | |
78 | ||
79 | /* | |
7a3d1328 | 80 | * Disable kernel tracepoint events for a channel from the kernel session. |
54d01ffb | 81 | */ |
7a3d1328 | 82 | int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
83 | struct ltt_kernel_channel *kchan) |
84 | { | |
85 | int ret; | |
86 | struct ltt_kernel_event *kevent; | |
87 | ||
88 | /* For each event in the kernel session */ | |
89 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
90 | ret = kernel_disable_event(kevent); | |
91 | if (ret < 0) { | |
92 | /* We continue disabling the rest */ | |
93 | continue; | |
94 | } | |
95 | } | |
54d01ffb | 96 | ret = LTTCOMM_OK; |
7a3d1328 MD |
97 | return ret; |
98 | } | |
99 | ||
100 | /* | |
101 | * Disable kernel syscall events for a channel from the kernel session. | |
102 | */ | |
103 | int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession, | |
104 | struct ltt_kernel_channel *kchan) | |
105 | { | |
106 | ERR("Cannot disable syscall tracing for existing session. Please destroy session instead."); | |
107 | return LTTCOMM_OK; /* Return OK so disable all succeeds */ | |
108 | } | |
54d01ffb | 109 | |
7a3d1328 MD |
110 | /* |
111 | * Disable all kernel event for a channel from the kernel session. | |
112 | */ | |
113 | int event_kernel_disable_all(struct ltt_kernel_session *ksession, | |
114 | struct ltt_kernel_channel *kchan) | |
115 | { | |
116 | int ret; | |
117 | ||
118 | ret = event_kernel_disable_all_tracepoints(ksession, kchan); | |
119 | if (ret != LTTCOMM_OK) | |
120 | return ret; | |
121 | ret = event_kernel_disable_all_syscalls(ksession, kchan); | |
54d01ffb DG |
122 | return ret; |
123 | } | |
124 | ||
125 | /* | |
7a3d1328 | 126 | * Enable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 127 | */ |
7a3d1328 | 128 | int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
129 | struct ltt_kernel_channel *kchan, struct lttng_event *event) |
130 | { | |
131 | int ret; | |
132 | struct ltt_kernel_event *kevent; | |
133 | ||
134 | kevent = trace_kernel_get_event_by_name(event->name, kchan); | |
135 | if (kevent == NULL) { | |
136 | ret = kernel_create_event(event, kchan); | |
137 | if (ret < 0) { | |
d87bfb32 DG |
138 | if (ret == -EEXIST) { |
139 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
140 | } else { | |
141 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
142 | } | |
7a3d1328 | 143 | goto end; |
54d01ffb DG |
144 | } |
145 | } else if (kevent->enabled == 0) { | |
146 | ret = kernel_enable_event(kevent); | |
147 | if (ret < 0) { | |
148 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7a3d1328 | 149 | goto end; |
54d01ffb DG |
150 | } |
151 | } | |
54d01ffb | 152 | ret = LTTCOMM_OK; |
7a3d1328 | 153 | end: |
54d01ffb DG |
154 | return ret; |
155 | } | |
156 | ||
157 | /* | |
7a3d1328 | 158 | * Enable all kernel tracepoint events of a channel of the kernel session. |
54d01ffb | 159 | */ |
7a3d1328 | 160 | int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
161 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
162 | { | |
163 | int size, i, ret; | |
164 | struct ltt_kernel_event *kevent; | |
165 | struct lttng_event *event_list; | |
166 | ||
167 | /* For each event in the kernel session */ | |
168 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
169 | ret = kernel_enable_event(kevent); | |
170 | if (ret < 0) { | |
171 | /* Enable failed but still continue */ | |
172 | continue; | |
173 | } | |
174 | } | |
175 | ||
176 | size = kernel_list_events(kernel_tracer_fd, &event_list); | |
177 | if (size < 0) { | |
178 | ret = LTTCOMM_KERN_LIST_FAIL; | |
7a3d1328 | 179 | goto end; |
54d01ffb DG |
180 | } |
181 | ||
182 | for (i = 0; i < size; i++) { | |
183 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); | |
184 | if (kevent == NULL) { | |
185 | /* Default event type for enable all */ | |
186 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
187 | /* Enable each single tracepoint event */ | |
188 | ret = kernel_create_event(&event_list[i], kchan); | |
189 | if (ret < 0) { | |
190 | /* Ignore error here and continue */ | |
191 | } | |
192 | } | |
193 | } | |
54d01ffb | 194 | free(event_list); |
54d01ffb | 195 | ret = LTTCOMM_OK; |
7a3d1328 | 196 | end: |
54d01ffb | 197 | return ret; |
7a3d1328 | 198 | |
54d01ffb | 199 | } |
8c9ae521 DG |
200 | |
201 | /* | |
7a3d1328 | 202 | * Enable all kernel tracepoint events of a channel of the kernel session. |
8c9ae521 | 203 | */ |
7a3d1328 | 204 | int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession, |
8c9ae521 DG |
205 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
206 | { | |
207 | int ret; | |
208 | struct lttng_event event; | |
209 | ||
210 | init_syscalls_kernel_event(&event); | |
211 | ||
212 | DBG("Enabling all syscall tracing"); | |
213 | ||
214 | ret = kernel_create_event(&event, kchan); | |
215 | if (ret < 0) { | |
7a3d1328 | 216 | goto end; |
8c9ae521 | 217 | } |
8c9ae521 | 218 | ret = LTTCOMM_OK; |
7a3d1328 MD |
219 | end: |
220 | return ret; | |
221 | } | |
8c9ae521 | 222 | |
7a3d1328 MD |
223 | /* |
224 | * Enable all kernel events of a channel of the kernel session. | |
225 | */ | |
226 | int event_kernel_enable_all(struct ltt_kernel_session *ksession, | |
227 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) | |
228 | { | |
229 | int ret; | |
230 | ||
231 | ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd); | |
232 | if (ret != LTTCOMM_OK) { | |
233 | goto end; | |
234 | } | |
235 | ret = event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd); | |
236 | end: | |
8c9ae521 DG |
237 | return ret; |
238 | } | |
2bdd86d4 MD |
239 | |
240 | /* | |
241 | * Enable UST tracepoint event for a channel from a UST session. | |
242 | */ | |
243 | int event_ust_enable_tracepoint(struct ltt_ust_session *ustsession, | |
244 | struct ltt_ust_channel *ustchan, struct lttng_event *event) | |
245 | { | |
246 | int ret; | |
247 | struct ltt_ust_event *ustevent; | |
248 | struct lttng_ust_event lttngustevent; | |
249 | struct object_data *object_event; | |
250 | ||
251 | ustevent = trace_ust_get_event_by_name(event->name, ustchan); | |
252 | if (ustevent == NULL) { | |
253 | ustevent = trace_ust_create_event(event); | |
254 | if (ustevent == NULL) { | |
255 | ret = -1; | |
256 | goto end; | |
257 | } | |
258 | strncpy(lttngustevent.name, event->name, | |
259 | LTTNG_UST_SYM_NAME_LEN); | |
260 | lttngustevent.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
261 | /* TODO: adjust to other instrumentation types */ | |
262 | lttngustevent.instrumentation = LTTNG_UST_TRACEPOINT; | |
263 | ret = ustctl_create_event(ustsession->sock, <tngustevent, | |
264 | ustchan->obj, &object_event); | |
265 | if (ret < 0) { | |
266 | if (ret == -EEXIST) { | |
267 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
268 | } else { | |
269 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
270 | } | |
271 | goto end; | |
272 | } | |
273 | ustevent->obj = object_event; | |
274 | ustevent->handle = object_event->handle; | |
275 | ustevent->enabled = 1; | |
276 | /* Add event to event list */ | |
277 | cds_list_add(&ustevent->list, &ustchan->events.head); | |
278 | ustchan->events.count++; | |
279 | } else if (ustevent->enabled == 0) { | |
280 | ret = ustctl_enable(ustsession->sock, ustevent->obj); | |
281 | if (ret < 0) { | |
282 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
283 | goto end; | |
284 | } | |
285 | ustevent->enabled = 1; | |
286 | } | |
287 | ret = LTTCOMM_OK; | |
288 | end: | |
289 | return ret; | |
290 | } | |
291 | ||
292 | int event_ust_disable_tracepoint(struct ltt_ust_session *ustsession, | |
293 | struct ltt_ust_channel *ustchan, char *event_name) | |
294 | { | |
295 | int ret; | |
296 | struct ltt_ust_event *ustevent; | |
297 | ||
298 | ustevent = trace_ust_get_event_by_name(event_name, ustchan); | |
299 | if (ustevent == NULL) { | |
300 | ret = LTTCOMM_NO_EVENT; | |
301 | goto end; | |
302 | } | |
303 | ret = ustctl_disable(ustsession->sock, ustevent->obj); | |
304 | if (ret < 0) { | |
305 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
306 | goto end; | |
307 | } | |
308 | ustevent->enabled = 0; | |
309 | ret = LTTCOMM_OK; | |
310 | end: | |
311 | return ret; | |
312 | } |