Documentation/ABI/testing/sysfs-kernel-fadump

What:		/sys/kernel/fadump/*
Date:		Dec 2019
Contact:	linuxppc-dev@lists.ozlabs.org
Description:
		The /sys/kernel/fadump/* is a collection of FADump sysfs
		file provide information about the configuration status
		of Firmware Assisted Dump (FADump).

What:		/sys/kernel/fadump/enabled
Date:		Dec 2019
Contact:	linuxppc-dev@lists.ozlabs.org
Description:	read only
		Primarily used to identify whether the FADump is enabled in
		the kernel or not.
User:		Kdump service

What:		/sys/kernel/fadump/registered
Date:		Dec 2019
Contact:	linuxppc-dev@lists.ozlabs.org
Description:	read/write
		Helps to control the dump collect feature from userspace.
		Setting 1 to this file enables the system to collect the
		dump and 0 to disable it.
User:		Kdump service

What:		/sys/kernel/fadump/release_mem
Date:		Dec 2019
Contact:	linuxppc-dev@lists.ozlabs.org
Description:	write only
		This is a special sysfs file and only available when
		the system is booted to capture the vmcore using FADump.
		It is used to release the memory reserved by FADump to
		save the crash dump.

What:		/sys/kernel/fadump/mem_reserved
Date:		Dec 2019
Contact:	linuxppc-dev@lists.ozlabs.org
Description:	read only
		Provide information about the amount of memory reserved by
		FADump to save the crash dump in bytes.

What:		/sys/kernel/fadump/hotplug_ready
Date:		Apr 2024
Contact:	linuxppc-dev@lists.ozlabs.org
Description:	read only
		Kdump udev rule re-registers fadump on memory add/remove events,
		primarily to update the elfcorehdr. This sysfs indicates the
		kdump udev rule that fadump re-registration is not required on
		memory add/remove events because elfcorehdr is now prepared in
		the second/fadump kernel.
User:		kexec-tools

What:		/sys/kernel/fadump/bootargs_append
Date:		May 2024
Contact:	linuxppc-dev@lists.ozlabs.org
Description:	read/write
		This is a special sysfs file available to setup additional
		parameters to be passed to capture kernel.