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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 }, | |
9ae7d41d | 51 | { "lttng-probe-signal", 0 }, |
bd9b9e63 | 52 | { "lttng-probe-statedump", 0 }, |
096102bd DG |
53 | }; |
54 | ||
55 | /* | |
56 | * Remove control kernel module(s) in reverse load order. | |
57 | */ | |
58 | void modprobe_remove_lttng_control(void) | |
59 | { | |
60 | int ret = 0, i; | |
61 | char modprobe[256]; | |
62 | ||
63 | for (i = ARRAY_SIZE(kern_modules_control) - 1; i >= 0; i--) { | |
64 | ret = snprintf(modprobe, sizeof(modprobe), | |
65 | "/sbin/modprobe -r -q %s", | |
66 | kern_modules_control[i].name); | |
67 | if (ret < 0) { | |
68 | PERROR("snprintf modprobe -r"); | |
69 | goto error; | |
70 | } | |
71 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
72 | ret = system(modprobe); | |
73 | if (ret == -1) { | |
74 | ERR("Unable to launch modprobe -r for module %s", | |
75 | kern_modules_control[i].name); | |
76 | } else if (kern_modules_control[i].required | |
77 | && WEXITSTATUS(ret) != 0) { | |
78 | ERR("Unable to remove module %s", | |
79 | kern_modules_control[i].name); | |
80 | } else { | |
81 | DBG("Modprobe removal successful %s", | |
82 | kern_modules_control[i].name); | |
83 | } | |
84 | } | |
85 | ||
86 | error: | |
87 | return; | |
88 | } | |
89 | ||
90 | /* | |
91 | * Remove data kernel modules in reverse load order. | |
92 | */ | |
93 | void modprobe_remove_lttng_data(void) | |
94 | { | |
95 | int ret = 0, i; | |
96 | char modprobe[256]; | |
97 | ||
98 | for (i = ARRAY_SIZE(kern_modules_list) - 1; i >= 0; i--) { | |
99 | ret = snprintf(modprobe, sizeof(modprobe), | |
100 | "/sbin/modprobe -r -q %s", | |
101 | kern_modules_list[i].name); | |
102 | if (ret < 0) { | |
103 | perror("snprintf modprobe -r"); | |
104 | goto error; | |
105 | } | |
106 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
107 | ret = system(modprobe); | |
108 | if (ret == -1) { | |
109 | ERR("Unable to launch modprobe -r for module %s", | |
110 | kern_modules_list[i].name); | |
111 | } else if (kern_modules_list[i].required | |
112 | && WEXITSTATUS(ret) != 0) { | |
113 | ERR("Unable to remove module %s", | |
114 | kern_modules_list[i].name); | |
115 | } else { | |
116 | DBG("Modprobe removal successful %s", | |
117 | kern_modules_list[i].name); | |
118 | } | |
119 | } | |
120 | ||
121 | error: | |
122 | return; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Remove all kernel modules in reverse order. | |
127 | */ | |
128 | void modprobe_remove_lttng_all(void) | |
129 | { | |
130 | modprobe_remove_lttng_data(); | |
131 | modprobe_remove_lttng_control(); | |
132 | } | |
133 | ||
134 | /* | |
135 | * Load control kernel module(s). | |
136 | */ | |
137 | int modprobe_lttng_control(void) | |
138 | { | |
139 | int ret = 0, i; | |
140 | char modprobe[256]; | |
141 | ||
142 | for (i = 0; i < ARRAY_SIZE(kern_modules_control); i++) { | |
143 | ret = snprintf(modprobe, sizeof(modprobe), | |
144 | "/sbin/modprobe %s%s", | |
145 | kern_modules_control[i].required ? "" : "-q ", | |
146 | kern_modules_control[i].name); | |
147 | if (ret < 0) { | |
148 | PERROR("snprintf modprobe"); | |
149 | goto error; | |
150 | } | |
151 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
152 | ret = system(modprobe); | |
153 | if (ret == -1) { | |
154 | ERR("Unable to launch modprobe for module %s", | |
155 | kern_modules_control[i].name); | |
156 | } else if (kern_modules_control[i].required | |
157 | && WEXITSTATUS(ret) != 0) { | |
158 | ERR("Unable to load module %s", | |
159 | kern_modules_control[i].name); | |
160 | } else { | |
161 | DBG("Modprobe successfully %s", | |
162 | kern_modules_control[i].name); | |
163 | } | |
164 | } | |
165 | ||
166 | error: | |
167 | return ret; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Load data kernel module(s). | |
172 | */ | |
173 | int modprobe_lttng_data(void) | |
174 | { | |
175 | int ret = 0, i; | |
176 | char modprobe[256]; | |
177 | ||
178 | for (i = 0; i < ARRAY_SIZE(kern_modules_list); i++) { | |
179 | ret = snprintf(modprobe, sizeof(modprobe), | |
180 | "/sbin/modprobe %s%s", | |
181 | kern_modules_list[i].required ? "" : "-q ", | |
182 | kern_modules_list[i].name); | |
183 | if (ret < 0) { | |
184 | perror("snprintf modprobe"); | |
185 | goto error; | |
186 | } | |
187 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
188 | ret = system(modprobe); | |
189 | if (ret == -1) { | |
190 | ERR("Unable to launch modprobe for module %s", | |
191 | kern_modules_list[i].name); | |
192 | } else if (kern_modules_list[i].required | |
193 | && WEXITSTATUS(ret) != 0) { | |
194 | ERR("Unable to load module %s", | |
195 | kern_modules_list[i].name); | |
196 | } else { | |
197 | DBG("Modprobe successfully %s", | |
198 | kern_modules_list[i].name); | |
199 | } | |
200 | } | |
201 | ||
202 | error: | |
203 | return ret; | |
204 | } | |
205 | ||
206 | /* | |
207 | * Load all lttng kernel modules. | |
208 | */ | |
209 | int modprobe_lttng_all(void) | |
210 | { | |
211 | int ret; | |
212 | ||
213 | ret = modprobe_lttng_control(); | |
214 | if (ret < 0) { | |
215 | goto error; | |
216 | } | |
217 | ||
218 | ret = modprobe_lttng_data(); | |
219 | if (ret < 0) { | |
220 | goto error; | |
221 | } | |
222 | ||
223 | error: | |
224 | return ret; | |
225 | } |