kexec-tools: bump version and add support for crashdump kernel

[openwrt/staging/wigyori.git] / package / boot / kexec-tools / files / kdump.init

diff --git a/package/boot/kexec-tools/files/kdump.init b/package/boot/kexec-tools/files/kdump.init
new file mode 100755 (executable)
index 0000000..057b8cc
--- /dev/null
+++ b/package/boot/kexec-tools/files/kdump.init
@@ -0,0 +1,182 @@
+#!/bin/sh /etc/rc.common
+
+START=41
+STOP=98
+
+EXTRA_COMMANDS="status"
+EXTRA_HELP="        status  Print crashkernel status"
+
+verify_kdump() {
+       local cfg="$1"
+       local enabled
+       local path
+       local save_vmcore
+       local save_dmesg
+
+       config_get_bool enabled "$cfg" enabled 1
+       config_get_bool save_dmesg "$cfg" save_dmesg 1
+       config_get_bool save_vmcore "$cfg" save_vmcore 0
+
+       [ "$enabled" -gt 0 ] || return 2
+
+       [ "$save_dmesg" -gt 0 ] || [ "$save_vmcore" -gt 0 ] || return 2
+
+       config_get path "$cfg" path "/"
+
+       [ -d "$path" ] || mkdir -p "$path" 2>/dev/null || return 1
+}
+
+run_kdump() {
+       local cfg="$1"
+       local enabled
+       local path
+       local save_vmcore
+       local save_dmesg
+
+       config_get_bool enabled "$cfg" enabled 1
+       [ "$enabled" -gt 0 ] || return
+
+       config_get_bool save_dmesg "$cfg" save_dmesg 1
+       config_get_bool save_vmcore "$cfg" save_vmcore 0
+       config_get path "$cfg" path "/"
+
+       timestamp=$(date "+%Y%m%dT%H%M%S")
+
+       if [ "$save_vmcore" -eq 1 ]; then
+               # would like 'sparse' but busybox doesn't support it
+               dd if=/proc/vmcore of="$path/vmcore-$timestamp" conv=fsync bs=1M
+       fi
+
+       if [ "$save_dmesg" -eq 1 ]; then
+               vmcore-dmesg /proc/vmcore > "$path/dmesg-$timestamp"
+       fi
+
+       sync
+       reboot -f
+}
+
+find_kernel() {
+       . /lib/functions.sh
+       local kernel
+
+       kernel="$BOOT_IMAGE"
+       if [ -r "$kernel" ]; then
+               echo $kernel
+               return 0
+       fi
+
+       kernel="$(find_mtd_part kernel)"
+       if [ -r "$kernel" ]; then
+               echo $kernel
+               return 0
+       fi
+
+       for voldir in /sys/class/ubi/ubi*_*; do
+               [ ! -e "$voldir" ] && continue
+               if [ "$(cat "${voldir}/name")" = "kernel" ]; then
+                       kernel="/dev/$(basename "$voldir")"
+                       echo $kernel
+                       return 0
+               fi
+       done
+
+       return 1
+}
+
+load_crashkernel() {
+       local append_cmdline
+       local kernel
+
+       kernel="$(find_kernel)"
+       [ $? -gt 0 ] && return 1
+
+       case "$(uname -m)" in
+               i?86|x86_64)
+                       grep -q "crashkernel=" /proc/cmdline || return 1
+                       append_cmdline="1 irqpoll reset_devices maxcpus=1"
+                       ;;
+               arm*)
+                       append_cmdline="1 maxcpus=1 reset_devices"
+                       ;;
+       esac
+       kexec -p "$kernel" --reuse-cmdline --append="$append_cmdline"
+       return $?
+}
+
+start() {
+       local retval
+
+       if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
+               return 1
+       fi
+
+       if [ -e /proc/vmcore ]; then
+               config_load kdump
+               config_foreach run_kdump kdump
+       else
+               config_load kdump
+               config_foreach verify_kdump kdump
+               retval=$?
+               [ $retval = 1 ] && return 1
+               [ $retval = 0 ] && load_crashkernel
+               return $?
+       fi
+}
+
+stop() {
+       [ "$(cat /sys/kernel/kexec_crash_loaded)" = "1" ] || return
+
+       if [ -e "$BOOT_IMAGE" ]; then
+               kexec -p -u "$BOOT_IMAGE"
+       fi
+}
+
+status() {
+       local retval kernel
+
+       if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
+               echo "crashdump not supported by kernel"
+               return
+       fi
+
+       if [ $(cat /sys/kernel/kexec_crash_size) -eq 0 ]; then
+               echo "memory for crashdump kernel not reserved!"
+               echo "check crashkernel= kernel cmdline parameter"
+               echo "(a reboot is required after installing kdump)"
+               return
+       fi
+
+       kernel="$(find_kernel)"
+       if [ $? -gt 0 ]; then
+               echo "cannot find kernel image"
+               return
+       else
+               echo "using kernel image $kernel"
+       fi
+
+       echo -n "kdump configuration is "
+       config_load kdump
+       retval=$?
+       if [ $retval = 0 ]; then
+               if [ "$(config_foreach echo kdump)" ]; then
+                       config_foreach verify_kdump kdump
+                       retval=$?
+               else
+                       retval=1
+               fi
+       fi
+
+       if [ $retval = 0 ]; then
+               echo "valid"
+       elif [ $retval = 2 ]; then
+               echo "disabled"
+       else
+               echo "BROKEN"
+       fi
+
+       echo -n "kexec crash kernel "
+       if [ "$(cat /sys/kernel/kexec_crash_loaded)" = "0" ]; then
+               echo -n "not "
+       fi
+       echo "loaded"
+}