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096102bd DG |
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[] = { | |
d8e76ef6 | 30 | { "lttng-tracer", 1 }, |
096102bd DG |
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 }, | |
d8e76ef6 DG |
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 }, | |
096102bd DG |
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 | }; | |
52 | ||
53 | /* | |
54 | * Remove control kernel module(s) in reverse load order. | |
55 | */ | |
56 | void modprobe_remove_lttng_control(void) | |
57 | { | |
58 | int ret = 0, i; | |
59 | char modprobe[256]; | |
60 | ||
61 | for (i = ARRAY_SIZE(kern_modules_control) - 1; i >= 0; i--) { | |
62 | ret = snprintf(modprobe, sizeof(modprobe), | |
63 | "/sbin/modprobe -r -q %s", | |
64 | kern_modules_control[i].name); | |
65 | if (ret < 0) { | |
66 | PERROR("snprintf modprobe -r"); | |
67 | goto error; | |
68 | } | |
69 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
70 | ret = system(modprobe); | |
71 | if (ret == -1) { | |
72 | ERR("Unable to launch modprobe -r for module %s", | |
73 | kern_modules_control[i].name); | |
74 | } else if (kern_modules_control[i].required | |
75 | && WEXITSTATUS(ret) != 0) { | |
76 | ERR("Unable to remove module %s", | |
77 | kern_modules_control[i].name); | |
78 | } else { | |
79 | DBG("Modprobe removal successful %s", | |
80 | kern_modules_control[i].name); | |
81 | } | |
82 | } | |
83 | ||
84 | error: | |
85 | return; | |
86 | } | |
87 | ||
88 | /* | |
89 | * Remove data kernel modules in reverse load order. | |
90 | */ | |
91 | void modprobe_remove_lttng_data(void) | |
92 | { | |
93 | int ret = 0, i; | |
94 | char modprobe[256]; | |
95 | ||
96 | for (i = ARRAY_SIZE(kern_modules_list) - 1; i >= 0; i--) { | |
97 | ret = snprintf(modprobe, sizeof(modprobe), | |
98 | "/sbin/modprobe -r -q %s", | |
99 | kern_modules_list[i].name); | |
100 | if (ret < 0) { | |
101 | perror("snprintf modprobe -r"); | |
102 | goto error; | |
103 | } | |
104 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
105 | ret = system(modprobe); | |
106 | if (ret == -1) { | |
107 | ERR("Unable to launch modprobe -r for module %s", | |
108 | kern_modules_list[i].name); | |
109 | } else if (kern_modules_list[i].required | |
110 | && WEXITSTATUS(ret) != 0) { | |
111 | ERR("Unable to remove module %s", | |
112 | kern_modules_list[i].name); | |
113 | } else { | |
114 | DBG("Modprobe removal successful %s", | |
115 | kern_modules_list[i].name); | |
116 | } | |
117 | } | |
118 | ||
119 | error: | |
120 | return; | |
121 | } | |
122 | ||
123 | /* | |
124 | * Remove all kernel modules in reverse order. | |
125 | */ | |
126 | void modprobe_remove_lttng_all(void) | |
127 | { | |
128 | modprobe_remove_lttng_data(); | |
129 | modprobe_remove_lttng_control(); | |
130 | } | |
131 | ||
132 | /* | |
133 | * Load control kernel module(s). | |
134 | */ | |
135 | int modprobe_lttng_control(void) | |
136 | { | |
137 | int ret = 0, i; | |
138 | char modprobe[256]; | |
139 | ||
140 | for (i = 0; i < ARRAY_SIZE(kern_modules_control); i++) { | |
141 | ret = snprintf(modprobe, sizeof(modprobe), | |
142 | "/sbin/modprobe %s%s", | |
143 | kern_modules_control[i].required ? "" : "-q ", | |
144 | kern_modules_control[i].name); | |
145 | if (ret < 0) { | |
146 | PERROR("snprintf modprobe"); | |
147 | goto error; | |
148 | } | |
149 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
150 | ret = system(modprobe); | |
151 | if (ret == -1) { | |
152 | ERR("Unable to launch modprobe for module %s", | |
153 | kern_modules_control[i].name); | |
154 | } else if (kern_modules_control[i].required | |
155 | && WEXITSTATUS(ret) != 0) { | |
156 | ERR("Unable to load module %s", | |
157 | kern_modules_control[i].name); | |
158 | } else { | |
159 | DBG("Modprobe successfully %s", | |
160 | kern_modules_control[i].name); | |
161 | } | |
162 | } | |
163 | ||
164 | error: | |
165 | return ret; | |
166 | } | |
167 | ||
168 | /* | |
169 | * Load data kernel module(s). | |
170 | */ | |
171 | int modprobe_lttng_data(void) | |
172 | { | |
173 | int ret = 0, i; | |
174 | char modprobe[256]; | |
175 | ||
176 | for (i = 0; i < ARRAY_SIZE(kern_modules_list); i++) { | |
177 | ret = snprintf(modprobe, sizeof(modprobe), | |
178 | "/sbin/modprobe %s%s", | |
179 | kern_modules_list[i].required ? "" : "-q ", | |
180 | kern_modules_list[i].name); | |
181 | if (ret < 0) { | |
182 | perror("snprintf modprobe"); | |
183 | goto error; | |
184 | } | |
185 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
186 | ret = system(modprobe); | |
187 | if (ret == -1) { | |
188 | ERR("Unable to launch modprobe for module %s", | |
189 | kern_modules_list[i].name); | |
190 | } else if (kern_modules_list[i].required | |
191 | && WEXITSTATUS(ret) != 0) { | |
192 | ERR("Unable to load module %s", | |
193 | kern_modules_list[i].name); | |
194 | } else { | |
195 | DBG("Modprobe successfully %s", | |
196 | kern_modules_list[i].name); | |
197 | } | |
198 | } | |
199 | ||
200 | error: | |
201 | return ret; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Load all lttng kernel modules. | |
206 | */ | |
207 | int modprobe_lttng_all(void) | |
208 | { | |
209 | int ret; | |
210 | ||
211 | ret = modprobe_lttng_control(); | |
212 | if (ret < 0) { | |
213 | goto error; | |
214 | } | |
215 | ||
216 | ret = modprobe_lttng_data(); | |
217 | if (ret < 0) { | |
218 | goto error; | |
219 | } | |
220 | ||
221 | error: | |
222 | return ret; | |
223 | } |