Add kernel modules loading for new probes
[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
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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-asoc", 0 },
48 { "lttng-probe-block", 0 },
49 { "lttng-probe-btrfs", 0 },
50 { "lttng-probe-compaction", 0 },
51 { "lttng-probe-ext3", 0 },
52 { "lttng-probe-ext4", 0 },
53 { "lttng-probe-gpio", 0 },
54 { "lttng-probe-irq", 0 },
55 { "lttng-probe-jbd", 0 },
56 { "lttng-probe-jbd2", 0 },
57 { "lttng-probe-kmem", 0 },
58 { "lttng-probe-kvm", 0 },
59 { "lttng-probe-lock", 0 },
60 { "lttng-probe-module", 0 },
61 { "lttng-probe-napi", 0 },
62 { "lttng-probe-net", 0 },
63 { "lttng-probe-power", 0 },
64 { "lttng-probe-printk", 0 },
65 { "lttng-probe-random", 0 },
66 { "lttng-probe-rcu", 0 },
67 { "lttng-probe-regmap", 0 },
68 { "lttng-probe-regulator", 0 },
69 { "lttng-probe-rpm", 0 },
70 { "lttng-probe-sched", 0 },
71 { "lttng-probe-scsi", 0 },
72 { "lttng-probe-signal", 0 },
73 { "lttng-probe-skb", 0 },
74 { "lttng-probe-sock", 0 },
75 { "lttng-probe-statedump", 0 },
76 { "lttng-probe-sunrpc", 0 },
77 { "lttng-probe-timer", 0 },
78 { "lttng-probe-udp", 0 },
79 { "lttng-probe-vmscan", 0 },
80 { "lttng-probe-workqueue", 0 },
81 { "lttng-probe-writeback", 0 },
82 };
83
84 /*
85 * Remove control kernel module(s) in reverse load order.
86 */
87 void modprobe_remove_lttng_control(void)
88 {
89 int ret = 0, i;
90 char modprobe[256];
91
92 for (i = ARRAY_SIZE(kern_modules_control) - 1; i >= 0; i--) {
93 ret = snprintf(modprobe, sizeof(modprobe),
94 "/sbin/modprobe -r -q %s",
95 kern_modules_control[i].name);
96 if (ret < 0) {
97 PERROR("snprintf modprobe -r");
98 goto error;
99 }
100 modprobe[sizeof(modprobe) - 1] = '\0';
101 ret = system(modprobe);
102 if (ret == -1) {
103 ERR("Unable to launch modprobe -r for module %s",
104 kern_modules_control[i].name);
105 } else if (kern_modules_control[i].required
106 && WEXITSTATUS(ret) != 0) {
107 ERR("Unable to remove module %s",
108 kern_modules_control[i].name);
109 } else {
110 DBG("Modprobe removal successful %s",
111 kern_modules_control[i].name);
112 }
113 }
114
115 error:
116 return;
117 }
118
119 /*
120 * Remove data kernel modules in reverse load order.
121 */
122 void modprobe_remove_lttng_data(void)
123 {
124 int ret = 0, i;
125 char modprobe[256];
126
127 for (i = ARRAY_SIZE(kern_modules_list) - 1; i >= 0; i--) {
128 ret = snprintf(modprobe, sizeof(modprobe),
129 "/sbin/modprobe -r -q %s",
130 kern_modules_list[i].name);
131 if (ret < 0) {
132 PERROR("snprintf modprobe -r");
133 goto error;
134 }
135 modprobe[sizeof(modprobe) - 1] = '\0';
136 ret = system(modprobe);
137 if (ret == -1) {
138 ERR("Unable to launch modprobe -r for module %s",
139 kern_modules_list[i].name);
140 } else if (kern_modules_list[i].required
141 && WEXITSTATUS(ret) != 0) {
142 ERR("Unable to remove module %s",
143 kern_modules_list[i].name);
144 } else {
145 DBG("Modprobe removal successful %s",
146 kern_modules_list[i].name);
147 }
148 }
149
150 error:
151 return;
152 }
153
154 /*
155 * Remove all kernel modules in reverse order.
156 */
157 void modprobe_remove_lttng_all(void)
158 {
159 modprobe_remove_lttng_data();
160 modprobe_remove_lttng_control();
161 }
162
163 /*
164 * Load control kernel module(s).
165 */
166 int modprobe_lttng_control(void)
167 {
168 int ret = 0, i;
169 char modprobe[256];
170
171 for (i = 0; i < ARRAY_SIZE(kern_modules_control); i++) {
172 ret = snprintf(modprobe, sizeof(modprobe),
173 "/sbin/modprobe %s%s",
174 kern_modules_control[i].required ? "" : "-q ",
175 kern_modules_control[i].name);
176 if (ret < 0) {
177 PERROR("snprintf modprobe");
178 goto error;
179 }
180 modprobe[sizeof(modprobe) - 1] = '\0';
181 ret = system(modprobe);
182 if (ret == -1) {
183 ERR("Unable to launch modprobe for module %s",
184 kern_modules_control[i].name);
185 } else if (kern_modules_control[i].required
186 && WEXITSTATUS(ret) != 0) {
187 ERR("Unable to load module %s",
188 kern_modules_control[i].name);
189 } else {
190 DBG("Modprobe successfully %s",
191 kern_modules_control[i].name);
192 }
193 }
194
195 error:
196 return ret;
197 }
198
199 /*
200 * Load data kernel module(s).
201 */
202 int modprobe_lttng_data(void)
203 {
204 int ret = 0, i;
205 char modprobe[256];
206
207 for (i = 0; i < ARRAY_SIZE(kern_modules_list); i++) {
208 ret = snprintf(modprobe, sizeof(modprobe),
209 "/sbin/modprobe %s%s",
210 kern_modules_list[i].required ? "" : "-q ",
211 kern_modules_list[i].name);
212 if (ret < 0) {
213 PERROR("snprintf modprobe");
214 goto error;
215 }
216 modprobe[sizeof(modprobe) - 1] = '\0';
217 ret = system(modprobe);
218 if (ret == -1) {
219 ERR("Unable to launch modprobe for module %s",
220 kern_modules_list[i].name);
221 } else if (kern_modules_list[i].required
222 && WEXITSTATUS(ret) != 0) {
223 ERR("Unable to load module %s",
224 kern_modules_list[i].name);
225 } else {
226 DBG("Modprobe successfully %s",
227 kern_modules_list[i].name);
228 }
229 }
230
231 error:
232 return ret;
233 }
234
235 /*
236 * Load all lttng kernel modules.
237 */
238 int modprobe_lttng_all(void)
239 {
240 int ret;
241
242 ret = modprobe_lttng_control();
243 if (ret < 0) {
244 goto error;
245 }
246
247 ret = modprobe_lttng_data();
248 if (ret < 0) {
249 goto error;
250 }
251
252 error:
253 return ret;
254 }
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