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powerpc/fadump: sysfs for fadump memory reservation

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Add a sys interface to allow querying the memory reserved by FADump for
saving the crash dump.

Also added Documentation/ABI for the new sysfs file.

Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191211160910.21656-7-sourabhjain@linux.ibm.com
This commit is contained in:
Sourabh Jain
2019-12-11 21:39:10 +05:30
committed by Michael Ellerman
parent 3f5f1f22ef
commit d8e73458f3
3 changed files with 21 additions and 0 deletions
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7
Documentation/ABI/testing/sysfs-kernel-fadump
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@@ -31,3 +31,10 @@ Description: write only
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.