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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 }, | |
bd9b9e63 | 51 | { "lttng-probe-statedump", 0 }, |
096102bd DG |
52 | }; |
53 | ||
54 | /* | |
55 | * Remove control kernel module(s) in reverse load order. | |
56 | */ | |
57 | void modprobe_remove_lttng_control(void) | |
58 | { | |
59 | int ret = 0, i; | |
60 | char modprobe[256]; | |
61 | ||
62 | for (i = ARRAY_SIZE(kern_modules_control) - 1; i >= 0; i--) { | |
63 | ret = snprintf(modprobe, sizeof(modprobe), | |
64 | "/sbin/modprobe -r -q %s", | |
65 | kern_modules_control[i].name); | |
66 | if (ret < 0) { | |
67 | PERROR("snprintf modprobe -r"); | |
68 | goto error; | |
69 | } | |
70 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
71 | ret = system(modprobe); | |
72 | if (ret == -1) { | |
73 | ERR("Unable to launch modprobe -r for module %s", | |
74 | kern_modules_control[i].name); | |
75 | } else if (kern_modules_control[i].required | |
76 | && WEXITSTATUS(ret) != 0) { | |
77 | ERR("Unable to remove module %s", | |
78 | kern_modules_control[i].name); | |
79 | } else { | |
80 | DBG("Modprobe removal successful %s", | |
81 | kern_modules_control[i].name); | |
82 | } | |
83 | } | |
84 | ||
85 | error: | |
86 | return; | |
87 | } | |
88 | ||
89 | /* | |
90 | * Remove data kernel modules in reverse load order. | |
91 | */ | |
92 | void modprobe_remove_lttng_data(void) | |
93 | { | |
94 | int ret = 0, i; | |
95 | char modprobe[256]; | |
96 | ||
97 | for (i = ARRAY_SIZE(kern_modules_list) - 1; i >= 0; i--) { | |
98 | ret = snprintf(modprobe, sizeof(modprobe), | |
99 | "/sbin/modprobe -r -q %s", | |
100 | kern_modules_list[i].name); | |
101 | if (ret < 0) { | |
102 | perror("snprintf modprobe -r"); | |
103 | goto error; | |
104 | } | |
105 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
106 | ret = system(modprobe); | |
107 | if (ret == -1) { | |
108 | ERR("Unable to launch modprobe -r for module %s", | |
109 | kern_modules_list[i].name); | |
110 | } else if (kern_modules_list[i].required | |
111 | && WEXITSTATUS(ret) != 0) { | |
112 | ERR("Unable to remove module %s", | |
113 | kern_modules_list[i].name); | |
114 | } else { | |
115 | DBG("Modprobe removal successful %s", | |
116 | kern_modules_list[i].name); | |
117 | } | |
118 | } | |
119 | ||
120 | error: | |
121 | return; | |
122 | } | |
123 | ||
124 | /* | |
125 | * Remove all kernel modules in reverse order. | |
126 | */ | |
127 | void modprobe_remove_lttng_all(void) | |
128 | { | |
129 | modprobe_remove_lttng_data(); | |
130 | modprobe_remove_lttng_control(); | |
131 | } | |
132 | ||
133 | /* | |
134 | * Load control kernel module(s). | |
135 | */ | |
136 | int modprobe_lttng_control(void) | |
137 | { | |
138 | int ret = 0, i; | |
139 | char modprobe[256]; | |
140 | ||
141 | for (i = 0; i < ARRAY_SIZE(kern_modules_control); i++) { | |
142 | ret = snprintf(modprobe, sizeof(modprobe), | |
143 | "/sbin/modprobe %s%s", | |
144 | kern_modules_control[i].required ? "" : "-q ", | |
145 | kern_modules_control[i].name); | |
146 | if (ret < 0) { | |
147 | PERROR("snprintf modprobe"); | |
148 | goto error; | |
149 | } | |
150 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
151 | ret = system(modprobe); | |
152 | if (ret == -1) { | |
153 | ERR("Unable to launch modprobe for module %s", | |
154 | kern_modules_control[i].name); | |
155 | } else if (kern_modules_control[i].required | |
156 | && WEXITSTATUS(ret) != 0) { | |
157 | ERR("Unable to load module %s", | |
158 | kern_modules_control[i].name); | |
159 | } else { | |
160 | DBG("Modprobe successfully %s", | |
161 | kern_modules_control[i].name); | |
162 | } | |
163 | } | |
164 | ||
165 | error: | |
166 | return ret; | |
167 | } | |
168 | ||
169 | /* | |
170 | * Load data kernel module(s). | |
171 | */ | |
172 | int modprobe_lttng_data(void) | |
173 | { | |
174 | int ret = 0, i; | |
175 | char modprobe[256]; | |
176 | ||
177 | for (i = 0; i < ARRAY_SIZE(kern_modules_list); i++) { | |
178 | ret = snprintf(modprobe, sizeof(modprobe), | |
179 | "/sbin/modprobe %s%s", | |
180 | kern_modules_list[i].required ? "" : "-q ", | |
181 | kern_modules_list[i].name); | |
182 | if (ret < 0) { | |
183 | perror("snprintf modprobe"); | |
184 | goto error; | |
185 | } | |
186 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
187 | ret = system(modprobe); | |
188 | if (ret == -1) { | |
189 | ERR("Unable to launch modprobe for module %s", | |
190 | kern_modules_list[i].name); | |
191 | } else if (kern_modules_list[i].required | |
192 | && WEXITSTATUS(ret) != 0) { | |
193 | ERR("Unable to load module %s", | |
194 | kern_modules_list[i].name); | |
195 | } else { | |
196 | DBG("Modprobe successfully %s", | |
197 | kern_modules_list[i].name); | |
198 | } | |
199 | } | |
200 | ||
201 | error: | |
202 | return ret; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Load all lttng kernel modules. | |
207 | */ | |
208 | int modprobe_lttng_all(void) | |
209 | { | |
210 | int ret; | |
211 | ||
212 | ret = modprobe_lttng_control(); | |
213 | if (ret < 0) { | |
214 | goto error; | |
215 | } | |
216 | ||
217 | ret = modprobe_lttng_data(); | |
218 | if (ret < 0) { | |
219 | goto error; | |
220 | } | |
221 | ||
222 | error: | |
223 | return ret; | |
224 | } |