Documentation/ABI/testing/sysfs-kernel-fadump

   1 What:           /sys/kernel/fadump/*
   2 Date:           Dec 2019
   3 Contact:        linuxppc-dev@lists.ozlabs.org
   4 Description:
   5                 The /sys/kernel/fadump/* is a collection of FADump sysfs
   6                 file provide information about the configuration status
   7                 of Firmware Assisted Dump (FADump).
   8
   9 What:           /sys/kernel/fadump/enabled
  10 Date:           Dec 2019
  11 Contact:        linuxppc-dev@lists.ozlabs.org
  12 Description:    read only
  13                 Primarily used to identify whether the FADump is enabled in
  14                 the kernel or not.
  15 User:           Kdump service
  16
  17 What:           /sys/kernel/fadump/registered
  18 Date:           Dec 2019
  19 Contact:        linuxppc-dev@lists.ozlabs.org
  20 Description:    read/write
  21                 Helps to control the dump collect feature from userspace.
  22                 Setting 1 to this file enables the system to collect the
  23                 dump and 0 to disable it.
  24 User:           Kdump service
  25
  26 What:           /sys/kernel/fadump/release_mem
  27 Date:           Dec 2019
  28 Contact:        linuxppc-dev@lists.ozlabs.org
  29 Description:    write only
  30                 This is a special sysfs file and only available when
  31                 the system is booted to capture the vmcore using FADump.
  32                 It is used to release the memory reserved by FADump to
  33                 save the crash dump.
  34
  35 What:           /sys/kernel/fadump/mem_reserved
  36 Date:           Dec 2019
  37 Contact:        linuxppc-dev@lists.ozlabs.org
  38 Description:    read only
  39                 Provide information about the amount of memory reserved by
  40                 FADump to save the crash dump in bytes.
  41
  42 What:           /sys/kernel/fadump/hotplug_ready
  43 Date:           Apr 2024
  44 Contact:        linuxppc-dev@lists.ozlabs.org
  45 Description:    read only
  46                 Kdump udev rule re-registers fadump on memory add/remove events,
  47                 primarily to update the elfcorehdr. This sysfs indicates the
  48                 kdump udev rule that fadump re-registration is not required on
  49                 memory add/remove events because elfcorehdr is now prepared in
  50                 the second/fadump kernel.
  51 User:           kexec-tools
  52
  53 What:           /sys/kernel/fadump/bootargs_append
  54 Date:           May 2024
  55 Contact:        linuxppc-dev@lists.ozlabs.org
  56 Description:    read/write
  57                 This is a special sysfs file available to setup additional
  58                 parameters to be passed to capture kernel.