5c1cc98502
This patch main goal is to "un-Debianize" the configuration file for kdump-steamos - thanks Emil (@xexaxo) for the discussions; it is with a bit of a heavy heart I do that, but let's comply with the modern distros ;-) We hereby put the config file in a more standard path: /usr/share. Usually users could override that with /etc/ file, but not in this case, or at least, not for now. Kdump/pstore is expected to work quietly, with no users' interference. Advanced users might want to play with the configs though; and those can just go ahead and edit the /usr/share/kdump/kdump.conf - it's all documented in the README. In the future we can improve that by having the override mechanism with the /etc file, let's see if we have a demand for that. Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
123 lines
4.6 KiB
Bash
123 lines
4.6 KiB
Bash
#!/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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# This function has 2 purposes: if 'kdump' is passed as argument and we don't
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# have crashkernel memory reserved, we edit grub config file and recreate
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# grub.cfg, so next boot has it reserved; in this case, we also bail-out,
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# since kdump can't be loaded anyway.
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#
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# If 'pstore' is passsed as argument, we try to unset crashkernel iff it's
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# already set AND the pattern in grub config is the one added by us - if the
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# users set crashkernel themselves, we don't mess with that.
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grub_update() {
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GRUBCFG="/etc/default/grub"
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CRASHK="$(cat /sys/kernel/kexec_crash_size)"
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SED_ADD="s/^GRUB_CMDLINE_LINUX_DEFAULT=\"/GRUB_CMDLINE_LINUX_DEFAULT=\"crashkernel=192M crash_kexec_post_notifiers /g"
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if [ "${GRUB_AUTOSET}" -eq 1 ]; then
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if [ "$1" = "kdump" ] && [ "${CRASHK}" -eq 0 ]; then
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sed -i "${SED_ADD}" "${GRUBCFG}"
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update-grub 1>/dev/null
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sync "/boot/grub/grub.cfg" 2>/dev/null
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sync "/efi/EFI/steamos/grub.cfg" 2>/dev/null
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logger "kdump-steamos: kdump cannot work, no reserved memory in this boot..."
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logger "kdump-steamos: but we automatically set crashkernel for next boot."
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exit 0
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fi
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if [ "$1" = "pstore" ] && [ "${CRASHK}" -ne 0 ]; then
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sed -i "s/\"crashkernel=192M crash_kexec_post_notifiers /\"/g" "${GRUBCFG}"
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update-grub 1>/dev/null
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sync "/boot/grub/grub.cfg" 2>/dev/null
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sync "/efi/EFI/steamos/grub.cfg" 2>/dev/null
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logger "kdump-steamos: clearing crashkernel memory previously set..."
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fi
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fi
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}
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if [ ! -s "/usr/share/kdump/kdump.conf" ]; then
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logger "kdump-steamos: /usr/share/kdump/kdump.conf is missing, aborting."
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exit 0
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fi
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. /usr/share/kdump/kdump.conf
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# Find the proper mount point for /home:
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DEVN_MOUNTED="$(findmnt "${MOUNT_DEVNODE}" -fno TARGET)"
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KDUMP_FOLDER="${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 /usr/share/kdump/kdump.conf 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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# If Pstore is set, update grub.cfg to avoid reserving crashkernel memory.
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logger "kdump-steamos: pstore-RAM was loaded successfully"
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grub_update pstore
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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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# Fallback to kdump load - if we fail when configuring pstore, better
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# trying kdump; in case we have crashkernel memory reserved, lucky us.
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# If not, we're going to set that automatically on grub_update().
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# Notice that if it's not set, we bail-out in grub_update() - there's
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# no point in continuing since kdump cannot work.
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fi
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grub_update kdump
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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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