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-types", 0 },
  46         { "lttng-probe-asoc", 0 },
  47         { "lttng-probe-block", 0 },
  48         { "lttng-probe-btrfs", 0 },
  49         { "lttng-probe-compaction", 0 },
  50         { "lttng-probe-ext3", 0 },
  51         { "lttng-probe-ext4", 0 },
  52         { "lttng-probe-gpio", 0 },
  53         { "lttng-probe-irq", 0 },
  54         { "lttng-probe-jbd", 0 },
  55         { "lttng-probe-jbd2", 0 },
  56         { "lttng-probe-kmem", 0 },
  57         { "lttng-probe-kvm", 0 },
  58         { "lttng-probe-kvm-x86", 0 },
  59         { "lttng-probe-kvm-x86-mmu", 0 },
  60         { "lttng-probe-lock", 0 },
  61         { "lttng-probe-module", 0 },
  62         { "lttng-probe-napi", 0 },
  63         { "lttng-probe-net", 0 },
  64         { "lttng-probe-power", 0 },
  65         { "lttng-probe-printk", 0 },
  66         { "lttng-probe-random", 0 },
  67         { "lttng-probe-rcu", 0 },
  68         { "lttng-probe-regmap", 0 },
  69         { "lttng-probe-regulator", 0 },
  70         { "lttng-probe-rpm", 0 },
  71         { "lttng-probe-sched", 0 },
  72         { "lttng-probe-scsi", 0 },
  73         { "lttng-probe-signal", 0 },
  74         { "lttng-probe-skb", 0 },
  75         { "lttng-probe-sock", 0 },
  76         { "lttng-probe-statedump", 0 },
  77         { "lttng-probe-sunrpc", 0 },
  78         { "lttng-probe-timer", 0 },
  79         { "lttng-probe-udp", 0 },
  80         { "lttng-probe-vmscan", 0 },
  81         { "lttng-probe-v4l2", 0 },
  82         { "lttng-probe-workqueue", 0 },
  83         { "lttng-probe-writeback", 0 },
  84 };
  85
  86 /*
  87  * Remove control kernel module(s) in reverse load order.
  88  */
  89 void modprobe_remove_lttng_control(void)
  90 {
  91         int ret = 0, i;
  92         char modprobe[256];
  93
  94         for (i = ARRAY_SIZE(kern_modules_control) - 1; i >= 0; i--) {
  95                 ret = snprintf(modprobe, sizeof(modprobe),
  96                                 "/sbin/modprobe -r -q %s",
  97                                 kern_modules_control[i].name);
  98                 if (ret < 0) {
  99                         PERROR("snprintf modprobe -r");
 100                         goto error;
 101                 }
 102                 modprobe[sizeof(modprobe) - 1] = '\0';
 103                 ret = system(modprobe);
 104                 if (ret == -1) {
 105                         ERR("Unable to launch modprobe -r for module %s",
 106                                         kern_modules_control[i].name);
 107                 } else if (kern_modules_control[i].required
 108                                 && WEXITSTATUS(ret) != 0) {
 109                         ERR("Unable to remove module %s",
 110                                         kern_modules_control[i].name);
 111                 } else {
 112                         DBG("Modprobe removal successful %s",
 113                                         kern_modules_control[i].name);
 114                 }
 115         }
 116
 117 error:
 118         return;
 119 }
 120
 121 /*
 122  * Remove data kernel modules in reverse load order.
 123  */
 124 void modprobe_remove_lttng_data(void)
 125 {
 126         int ret = 0, i;
 127         char modprobe[256];
 128
 129         for (i = ARRAY_SIZE(kern_modules_list) - 1; i >= 0; i--) {
 130                 ret = snprintf(modprobe, sizeof(modprobe),
 131                                 "/sbin/modprobe -r -q %s",
 132                                 kern_modules_list[i].name);
 133                 if (ret < 0) {
 134                         PERROR("snprintf modprobe -r");
 135                         goto error;
 136                 }
 137                 modprobe[sizeof(modprobe) - 1] = '\0';
 138                 ret = system(modprobe);
 139                 if (ret == -1) {
 140                         ERR("Unable to launch modprobe -r for module %s",
 141                                         kern_modules_list[i].name);
 142                 } else if (kern_modules_list[i].required
 143                                 && WEXITSTATUS(ret) != 0) {
 144                         ERR("Unable to remove module %s",
 145                                         kern_modules_list[i].name);
 146                 } else {
 147                         DBG("Modprobe removal successful %s",
 148                                         kern_modules_list[i].name);
 149                 }
 150         }
 151
 152 error:
 153         return;
 154 }
 155
 156 /*
 157  * Remove all kernel modules in reverse order.
 158  */
 159 void modprobe_remove_lttng_all(void)
 160 {
 161         modprobe_remove_lttng_data();
 162         modprobe_remove_lttng_control();
 163 }
 164
 165 /*
 166  * Load control kernel module(s).
 167  */
 168 int modprobe_lttng_control(void)
 169 {
 170         int ret = 0, i;
 171         char modprobe[256];
 172
 173         for (i = 0; i < ARRAY_SIZE(kern_modules_control); i++) {
 174                 ret = snprintf(modprobe, sizeof(modprobe),
 175                                 "/sbin/modprobe %s%s",
 176                                 kern_modules_control[i].required ? "" : "-q ",
 177                                 kern_modules_control[i].name);
 178                 if (ret < 0) {
 179                         PERROR("snprintf modprobe");
 180                         goto error;
 181                 }
 182                 modprobe[sizeof(modprobe) - 1] = '\0';
 183                 ret = system(modprobe);
 184                 if (ret == -1) {
 185                         ERR("Unable to launch modprobe for module %s",
 186                                         kern_modules_control[i].name);
 187                 } else if (kern_modules_control[i].required
 188                                 && WEXITSTATUS(ret) != 0) {
 189                         ERR("Unable to load module %s",
 190                                         kern_modules_control[i].name);
 191                 } else {
 192                         DBG("Modprobe successfully %s",
 193                                         kern_modules_control[i].name);
 194                 }
 195         }
 196
 197 error:
 198         return ret;
 199 }
 200
 201 /*
 202  * Load data kernel module(s).
 203  */
 204 int modprobe_lttng_data(void)
 205 {
 206         int ret = 0, i;
 207         char modprobe[256];
 208
 209         for (i = 0; i < ARRAY_SIZE(kern_modules_list); i++) {
 210                 ret = snprintf(modprobe, sizeof(modprobe),
 211                                 "/sbin/modprobe %s%s",
 212                                 kern_modules_list[i].required ? "" : "-q ",
 213                                 kern_modules_list[i].name);
 214                 if (ret < 0) {
 215                         PERROR("snprintf modprobe");
 216                         goto error;
 217                 }
 218                 modprobe[sizeof(modprobe) - 1] = '\0';
 219                 ret = system(modprobe);
 220                 if (ret == -1) {
 221                         ERR("Unable to launch modprobe for module %s",
 222                                         kern_modules_list[i].name);
 223                 } else if (kern_modules_list[i].required
 224                                 && WEXITSTATUS(ret) != 0) {
 225                         ERR("Unable to load module %s",
 226                                         kern_modules_list[i].name);
 227                 } else {
 228                         DBG("Modprobe successfully %s",
 229                                         kern_modules_list[i].name);
 230                 }
 231         }
 232
 233 error:
 234         return ret;
 235 }