package/boot/kexec-tools/files/kdump.init

   1 #!/bin/sh /etc/rc.common
   2
   3 START=41
   4 STOP=90
   5
   6 EXTRA_COMMANDS="status"
   7 EXTRA_HELP="        status  Print crashkernel status"
   8
   9 verify_kdump() {
  10         local cfg="$1"
  11         local enabled
  12         local path
  13         local save_vmcore
  14         local save_dmesg
  15
  16         config_get_bool enabled "$cfg" enabled 1
  17         config_get_bool save_dmesg "$cfg" save_dmesg 1
  18         config_get_bool save_vmcore "$cfg" save_vmcore 0
  19
  20         [ "$enabled" -gt 0 ] || return 2
  21
  22         [ "$save_dmesg" -gt 0 ] || [ "$save_vmcore" -gt 0 ] || return 2
  23
  24         config_get path "$cfg" path "/"
  25
  26         [ -d "$path" ] || mkdir -p "$path" 2>/dev/null || return 1
  27 }
  28
  29 run_kdump() {
  30         local cfg="$1"
  31         local enabled
  32         local path
  33         local save_vmcore
  34         local save_dmesg
  35
  36         config_get_bool enabled "$cfg" enabled 1
  37         [ "$enabled" -gt 0 ] || return
  38
  39         config_get_bool save_dmesg "$cfg" save_dmesg 1
  40         config_get_bool save_vmcore "$cfg" save_vmcore 0
  41         config_get path "$cfg" path "/"
  42
  43         timestamp=$(date "+%Y%m%dT%H%M%S")
  44
  45         if [ "$save_vmcore" -eq 1 ]; then
  46                 echo -n "Saving vmcore (this may take a while)..."
  47                 # would like 'sparse' but busybox doesn't support it
  48                 dd if=/proc/vmcore of="$path/vmcore-$timestamp" conv=fsync bs=1M
  49                 echo " done"
  50         fi
  51
  52         if [ "$save_dmesg" -eq 1 ]; then
  53                 vmcore-dmesg /proc/vmcore > "$path/dmesg-$timestamp"
  54         fi
  55
  56         sync
  57         reboot -f
  58 }
  59
  60 find_kernel() {
  61         . /lib/functions.sh
  62         local kernel
  63
  64         kernel="$BOOT_IMAGE"
  65         if [ -r "$kernel" ]; then
  66                 echo $kernel
  67                 return 0
  68         fi
  69
  70         kernel="$(find_mtd_part kernel)"
  71         if [ -r "$kernel" ]; then
  72                 echo $kernel
  73                 return 0
  74         fi
  75
  76         for voldir in /sys/class/ubi/ubi*_*; do
  77                 [ ! -e "$voldir" ] && continue
  78                 if [ "$(cat "${voldir}/name")" = "kernel" ]; then
  79                         kernel="/dev/$(basename "$voldir")"
  80                         echo $kernel
  81                         return 0
  82                 fi
  83         done
  84
  85         return 1
  86 }
  87
  88 load_crashkernel() {
  89         local append_cmdline
  90         local kernel
  91
  92         kernel="$(find_kernel)"
  93         [ $? -gt 0 ] && return 1
  94
  95         case "$(uname -m)" in
  96                 i?86|x86_64)
  97                         grep -q "crashkernel=" /proc/cmdline || return 1
  98                         append_cmdline="1 irqpoll reset_devices maxcpus=1"
  99                         ;;
 100                 arm*)
 101                         append_cmdline="1 maxcpus=1 reset_devices"
 102                         ;;
 103         esac
 104         kexec -p "$kernel" --reuse-cmdline --append="$append_cmdline"
 105         return $?
 106 }
 107
 108 start() {
 109         local retval
 110
 111         if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
 112                 return 1
 113         fi
 114
 115         if [ -e /proc/vmcore ]; then
 116                 config_load kdump
 117                 config_foreach run_kdump kdump
 118         else
 119                 config_load kdump
 120                 config_foreach verify_kdump kdump
 121                 retval=$?
 122                 [ $retval = 1 ] && return 1
 123                 [ $retval = 0 ] && load_crashkernel
 124                 return $?
 125         fi
 126 }
 127
 128 stop() {
 129         [ "$(cat /sys/kernel/kexec_crash_loaded)" = "1" ] || return
 130
 131         if [ -e "$BOOT_IMAGE" ]; then
 132                 kexec -p -u "$BOOT_IMAGE"
 133         fi
 134 }
 135
 136 status() {
 137         local retval kernel
 138
 139         if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
 140                 echo "crashdump not supported by kernel"
 141                 return
 142         fi
 143
 144         if [ $(cat /sys/kernel/kexec_crash_size) -eq 0 ]; then
 145                 echo "memory for crashdump kernel not reserved!"
 146                 echo "check crashkernel= kernel cmdline parameter"
 147                 echo "(a reboot is required after installing kdump)"
 148                 return
 149         fi
 150
 151         kernel="$(find_kernel)"
 152         if [ $? -gt 0 ]; then
 153                 echo "cannot find kernel image"
 154                 return
 155         else
 156                 echo "using kernel image $kernel"
 157         fi
 158
 159         echo -n "kdump configuration is "
 160         config_load kdump
 161         retval=$?
 162         if [ $retval = 0 ]; then
 163                 if [ "$(config_foreach echo kdump)" ]; then
 164                         config_foreach verify_kdump kdump
 165                         retval=$?
 166                 else
 167                         retval=1
 168                 fi
 169         fi
 170
 171         if [ $retval = 0 ]; then
 172                 echo "valid"
 173         elif [ $retval = 2 ]; then
 174                 echo "disabled"
 175         else
 176                 echo "BROKEN"
 177         fi
 178
 179         echo -n "kexec crash kernel "
 180         if [ "$(cat /sys/kernel/kexec_crash_loaded)" = "0" ]; then
 181                 echo -n "not "
 182         fi
 183         echo "loaded"
 184 }