| 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. For HASH MMU it | |
| is exported only if RMA size higher than 768MB. |