| 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 | } |