modprobe timer instrumentation module
[lttng-tools.git] / src / bin / lttng-sessiond / modprobe.c
1 /*
2 * Copyright (C) 2011 - David Goulet <dgoulet@efficios.com>
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
18 #define _GNU_SOURCE
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <sys/wait.h>
22
23 #include <common/common.h>
24
25 #include "modprobe.h"
26 #include "kern-modules.h"
27
28 /* MUST be loaded first */
29 const struct kern_modules_param kern_modules_control[] = {
30 { "lttng-tracer", 1 },
31 };
32
33 /* LTTng kernel tracer modules list */
34 const struct kern_modules_param kern_modules_list[] = {
35 { "lttng-ftrace", 0 },
36 { "lttng-kprobes", 0 },
37 { "lttng-kretprobes", 0 },
38 { "lttng-lib-ring-buffer", 1 },
39 { "lttng-ring-buffer-client-discard", 1 },
40 { "lttng-ring-buffer-client-overwrite", 1 },
41 { "lttng-ring-buffer-metadata-client", 1 },
42 { "lttng-ring-buffer-client-mmap-discard", 1 },
43 { "lttng-ring-buffer-client-mmap-overwrite", 1 },
44 { "lttng-ring-buffer-metadata-mmap-client", 1 },
45 { "lttng-probe-lttng", 1 },
46 { "lttng-types", 0 },
47 { "lttng-probe-block", 0 },
48 { "lttng-probe-irq", 0 },
49 { "lttng-probe-kvm", 0 },
50 { "lttng-probe-sched", 0 },
51 { "lttng-probe-signal", 0 },
52 { "lttng-probe-statedump", 0 },
53 { "lttng-probe-timer", 0 },
54 };
55
56 /*
57 * Remove control kernel module(s) in reverse load order.
58 */
59 void modprobe_remove_lttng_control(void)
60 {
61 int ret = 0, i;
62 char modprobe[256];
63
64 for (i = ARRAY_SIZE(kern_modules_control) - 1; i >= 0; i--) {
65 ret = snprintf(modprobe, sizeof(modprobe),
66 "/sbin/modprobe -r -q %s",
67 kern_modules_control[i].name);
68 if (ret < 0) {
69 PERROR("snprintf modprobe -r");
70 goto error;
71 }
72 modprobe[sizeof(modprobe) - 1] = '\0';
73 ret = system(modprobe);
74 if (ret == -1) {
75 ERR("Unable to launch modprobe -r for module %s",
76 kern_modules_control[i].name);
77 } else if (kern_modules_control[i].required
78 && WEXITSTATUS(ret) != 0) {
79 ERR("Unable to remove module %s",
80 kern_modules_control[i].name);
81 } else {
82 DBG("Modprobe removal successful %s",
83 kern_modules_control[i].name);
84 }
85 }
86
87 error:
88 return;
89 }
90
91 /*
92 * Remove data kernel modules in reverse load order.
93 */
94 void modprobe_remove_lttng_data(void)
95 {
96 int ret = 0, i;
97 char modprobe[256];
98
99 for (i = ARRAY_SIZE(kern_modules_list) - 1; i >= 0; i--) {
100 ret = snprintf(modprobe, sizeof(modprobe),
101 "/sbin/modprobe -r -q %s",
102 kern_modules_list[i].name);
103 if (ret < 0) {
104 perror("snprintf modprobe -r");
105 goto error;
106 }
107 modprobe[sizeof(modprobe) - 1] = '\0';
108 ret = system(modprobe);
109 if (ret == -1) {
110 ERR("Unable to launch modprobe -r for module %s",
111 kern_modules_list[i].name);
112 } else if (kern_modules_list[i].required
113 && WEXITSTATUS(ret) != 0) {
114 ERR("Unable to remove module %s",
115 kern_modules_list[i].name);
116 } else {
117 DBG("Modprobe removal successful %s",
118 kern_modules_list[i].name);
119 }
120 }
121
122 error:
123 return;
124 }
125
126 /*
127 * Remove all kernel modules in reverse order.
128 */
129 void modprobe_remove_lttng_all(void)
130 {
131 modprobe_remove_lttng_data();
132 modprobe_remove_lttng_control();
133 }
134
135 /*
136 * Load control kernel module(s).
137 */
138 int modprobe_lttng_control(void)
139 {
140 int ret = 0, i;
141 char modprobe[256];
142
143 for (i = 0; i < ARRAY_SIZE(kern_modules_control); i++) {
144 ret = snprintf(modprobe, sizeof(modprobe),
145 "/sbin/modprobe %s%s",
146 kern_modules_control[i].required ? "" : "-q ",
147 kern_modules_control[i].name);
148 if (ret < 0) {
149 PERROR("snprintf modprobe");
150 goto error;
151 }
152 modprobe[sizeof(modprobe) - 1] = '\0';
153 ret = system(modprobe);
154 if (ret == -1) {
155 ERR("Unable to launch modprobe for module %s",
156 kern_modules_control[i].name);
157 } else if (kern_modules_control[i].required
158 && WEXITSTATUS(ret) != 0) {
159 ERR("Unable to load module %s",
160 kern_modules_control[i].name);
161 } else {
162 DBG("Modprobe successfully %s",
163 kern_modules_control[i].name);
164 }
165 }
166
167 error:
168 return ret;
169 }
170
171 /*
172 * Load data kernel module(s).
173 */
174 int modprobe_lttng_data(void)
175 {
176 int ret = 0, i;
177 char modprobe[256];
178
179 for (i = 0; i < ARRAY_SIZE(kern_modules_list); i++) {
180 ret = snprintf(modprobe, sizeof(modprobe),
181 "/sbin/modprobe %s%s",
182 kern_modules_list[i].required ? "" : "-q ",
183 kern_modules_list[i].name);
184 if (ret < 0) {
185 perror("snprintf modprobe");
186 goto error;
187 }
188 modprobe[sizeof(modprobe) - 1] = '\0';
189 ret = system(modprobe);
190 if (ret == -1) {
191 ERR("Unable to launch modprobe for module %s",
192 kern_modules_list[i].name);
193 } else if (kern_modules_list[i].required
194 && WEXITSTATUS(ret) != 0) {
195 ERR("Unable to load module %s",
196 kern_modules_list[i].name);
197 } else {
198 DBG("Modprobe successfully %s",
199 kern_modules_list[i].name);
200 }
201 }
202
203 error:
204 return ret;
205 }
206
207 /*
208 * Load all lttng kernel modules.
209 */
210 int modprobe_lttng_all(void)
211 {
212 int ret;
213
214 ret = modprobe_lttng_control();
215 if (ret < 0) {
216 goto error;
217 }
218
219 ret = modprobe_lttng_data();
220 if (ret < 0) {
221 goto error;
222 }
223
224 error:
225 return ret;
226 }
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