85 lines
3.1 KiB
Bash
Executable File
85 lines
3.1 KiB
Bash
Executable File
#!/bin/bash
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#
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# SPDX-License-Identifier: LGPL-2.1+
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#
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# Copyright (c) 2021 Valve.
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#
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# Script that loads the panic kdump (from within a systemd service) and/or
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# configures the Pstore-RAM mechanism. If the proper parameters are passed
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# also, either it creates the minimal kdump initramfs for the running kernel
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# or removes all the previously created ones. Since it runs on boot time,
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# avoid failing here to not risk a boot hang.
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#
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if [ ! -f "/etc/default/kdump" ]; then
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logger "kdump-steamos: /etc/default/kdump not present - aborting..."
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exit 0
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fi
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. /etc/default/kdump
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# Fragile way for finding the proper mount point for DEVNODE:
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DEVN_MOUNTED=$(mount |grep "${MOUNT_DEVNODE}" | head -n1 | cut -f3 -d\ )
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KDUMP_FOLDER="${DEVN_MOUNTED}/${KDUMP_FOLDER}"
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echo "${KDUMP_FOLDER}" > "${KDUMP_MNT}"
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sync "${KDUMP_MNT}"
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if [ "$1" = "initrd" ]; then
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mkdir -p "${KDUMP_FOLDER}"
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rm -f "${KDUMP_FOLDER}/kdump-initrd-$(uname -r).img"
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echo "Creating the kdump initramfs for kernel \"$(uname -r)\" ..."
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dracut --no-early-microcode --host-only -q -m\
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"bash systemd systemd-initrd systemd-sysusers modsign dbus-daemon kdump dbus udev-rules dracut-systemd base fs-lib shutdown"\
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--kver "$(uname -r)" "${KDUMP_FOLDER}/kdump-initrd-$(uname -r).img"
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exit 0
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fi
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if [ "$1" = "clear" ]; then
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rm -f "${KDUMP_FOLDER}"/kdump-initrd-*
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exit 0
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fi
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# Pstore-RAM load; if it is configured via /etc/default/kdump and fails
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# to configure pstore, we still try to load the kdump. We try to reserve
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# here a 5MiB memory region.
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# Notice that we assume ramoops is a module here - if built-in, we should
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# properly load it through command-line parameters.
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if [ "${USE_PSTORE_RAM}" -eq 1 ]; then
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MEM_REQUIRED=5242880 # 5MiB
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RECORD_SIZE=0x200000 # 2MiB
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RANGE=$(grep "RAM buffer" /proc/iomem | head -n1 | cut -f1 -d\ )
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MEM_END=$(echo "$RANGE" | cut -f2 -d-)
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MEM_START=$(echo "$RANGE" | cut -f1 -d-)
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MEM_SIZE=$(( 16#${MEM_END} - 16#${MEM_START} ))
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if [ ${MEM_SIZE} -ge ${MEM_REQUIRED} ]; then
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if modprobe ramoops mem_address=0x${MEM_START} mem_size=${MEM_REQUIRED} record_size=${RECORD_SIZE}; then
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logger "kdump-steamos: pstore-RAM was loaded successfully"
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exit 0
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fi
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logger "kdump-steamos: pstore-RAM load failed...will try kdump"
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fi
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# Fallbacks to kdump load - if we fail when configuring pstore, better try kdump;
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# who knows and we may be lucky enough to have some crashkernel reserved memory...
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fi
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# TODO: insert code here to validate that crashkernel is configured and
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# memory is reserved; if not, set it on grub.cfg and recreate the EFI grub
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# config file, warning users that in the current boot kdump is not set.
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# Stolen from Debian kdump
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KDUMP_CMDLINE=$(sed -re 's/(^| )(crashkernel|hugepages|hugepagesz)=[^ ]*//g;s/"/\\\\"/' /proc/cmdline)
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KDUMP_CMDLINE="${KDUMP_CMDLINE} panic=-1 oops=panic fsck.mode=force fsck.repair=yes nr_cpus=1 reset_devices"
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VMLINUX="$(grep -o 'BOOT_IMAGE=[^ ]*' /proc/cmdline)"
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if ! kexec -s -p "${VMLINUX#*BOOT_IMAGE=}" --initrd "${KDUMP_FOLDER}/kdump-initrd-$(uname -r).img" --append="${KDUMP_CMDLINE}"; then
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logger "kdump-steamos: kdump load failed"
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exit 0
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fi
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logger "kdump-steamos: kdump was loaded successfully"
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