2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
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.
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
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.
18 #include <urcu/list.h>
20 #include <lttng/lttng.h>
21 #include <lttng-sessiond-comm.h>
26 #include "kernel-ctl.h"
29 * Setup a lttng_event used to enable *all* syscall tracing.
31 static void init_syscalls_kernel_event(struct lttng_event
*event
)
33 event
->name
[0] = '\0';
35 * We use LTTNG_EVENT* here since the trace kernel creation will make the
36 * right changes for the kernel.
38 event
->type
= LTTNG_EVENT_SYSCALL
;
42 * Disable kernel tracepoint event for a channel from the kernel session.
44 int event_kernel_disable_tracepoint(struct ltt_kernel_session
*ksession
,
45 struct ltt_kernel_channel
*kchan
, char *event_name
)
48 struct ltt_kernel_event
*kevent
;
50 kevent
= trace_kernel_get_event_by_name(event_name
, kchan
);
52 ret
= LTTCOMM_NO_EVENT
;
56 ret
= kernel_disable_event(kevent
);
58 ret
= LTTCOMM_KERN_DISABLE_FAIL
;
62 DBG("Kernel event %s disable for channel %s.",
63 kevent
->event
->name
, kchan
->channel
->name
);
72 * Disable kernel tracepoint events for a channel from the kernel session.
74 int event_kernel_disable_all_tracepoints(struct ltt_kernel_session
*ksession
,
75 struct ltt_kernel_channel
*kchan
)
78 struct ltt_kernel_event
*kevent
;
80 /* For each event in the kernel session */
81 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
82 ret
= kernel_disable_event(kevent
);
84 /* We continue disabling the rest */
93 * Disable kernel syscall events for a channel from the kernel session.
95 int event_kernel_disable_all_syscalls(struct ltt_kernel_session
*ksession
,
96 struct ltt_kernel_channel
*kchan
)
98 ERR("Cannot disable syscall tracing for existing session. Please destroy session instead.");
99 return LTTCOMM_OK
; /* Return OK so disable all succeeds */
103 * Disable all kernel event for a channel from the kernel session.
105 int event_kernel_disable_all(struct ltt_kernel_session
*ksession
,
106 struct ltt_kernel_channel
*kchan
)
110 ret
= event_kernel_disable_all_tracepoints(ksession
, kchan
);
111 if (ret
!= LTTCOMM_OK
)
113 ret
= event_kernel_disable_all_syscalls(ksession
, kchan
);
118 * Enable kernel tracepoint event for a channel from the kernel session.
120 int event_kernel_enable_tracepoint(struct ltt_kernel_session
*ksession
,
121 struct ltt_kernel_channel
*kchan
, struct lttng_event
*event
)
124 struct ltt_kernel_event
*kevent
;
126 kevent
= trace_kernel_get_event_by_name(event
->name
, kchan
);
127 if (kevent
== NULL
) {
128 ret
= kernel_create_event(event
, kchan
);
130 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
133 } else if (kevent
->enabled
== 0) {
134 ret
= kernel_enable_event(kevent
);
136 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
146 * Enable all kernel tracepoint events of a channel of the kernel session.
148 int event_kernel_enable_all_tracepoints(struct ltt_kernel_session
*ksession
,
149 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
152 struct ltt_kernel_event
*kevent
;
153 struct lttng_event
*event_list
;
155 /* For each event in the kernel session */
156 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
157 ret
= kernel_enable_event(kevent
);
159 /* Enable failed but still continue */
164 size
= kernel_list_events(kernel_tracer_fd
, &event_list
);
166 ret
= LTTCOMM_KERN_LIST_FAIL
;
170 for (i
= 0; i
< size
; i
++) {
171 kevent
= trace_kernel_get_event_by_name(event_list
[i
].name
, kchan
);
172 if (kevent
== NULL
) {
173 /* Default event type for enable all */
174 event_list
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
175 /* Enable each single tracepoint event */
176 ret
= kernel_create_event(&event_list
[i
], kchan
);
178 /* Ignore error here and continue */
190 * Enable all kernel tracepoint events of a channel of the kernel session.
192 int event_kernel_enable_all_syscalls(struct ltt_kernel_session
*ksession
,
193 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
196 struct lttng_event event
;
198 init_syscalls_kernel_event(&event
);
200 DBG("Enabling all syscall tracing");
202 ret
= kernel_create_event(&event
, kchan
);
212 * Enable all kernel events of a channel of the kernel session.
214 int event_kernel_enable_all(struct ltt_kernel_session
*ksession
,
215 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
219 ret
= event_kernel_enable_all_tracepoints(ksession
, kchan
, kernel_tracer_fd
);
220 if (ret
!= LTTCOMM_OK
) {
223 ret
= event_kernel_enable_all_syscalls(ksession
, kchan
, kernel_tracer_fd
);