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powerpc/fadump: update documentation about option to release opalcore

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With /sys/firmware/opal/core support available on OPAL based machines
and an option to the release memory used by kernel in exporting this
core file, update FADump documentation with these details.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821382786.5656.13173494907671241231.stgit@hbathini.in.ibm.com
This commit is contained in:
Hari Bathini 2019-09-11 20:27:12 +05:30 committed by Michael Ellerman
parent 7b1b3b4825
commit b3bba79d5a
1 changed files with 19 additions and 0 deletions
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19
Documentation/powerpc/firmware-assisted-dump.rst
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@ -110,6 +110,16 @@ capture kernel boot to process this crash data. Kernel config
option CONFIG_PRESERVE_FA_DUMP has to be enabled on such kernel option CONFIG_PRESERVE_FA_DUMP has to be enabled on such kernel
to ensure that crash data is preserved to process later. to ensure that crash data is preserved to process later.
-- On OPAL based machines (PowerNV), if the kernel is build with
CONFIG_OPAL_CORE=y, OPAL memory at the time of crash is also
exported as /sys/firmware/opal/core file. This procfs file is
helpful in debugging OPAL crashes with GDB. The kernel memory
used for exporting this procfs file can be released by echo'ing
'1' to /sys/kernel/fadump_release_opalcore node.
e.g.
# echo 1 > /sys/kernel/fadump_release_opalcore
Implementation details: Implementation details:
----------------------- -----------------------
@ -273,6 +283,15 @@ Here is the list of files under kernel sysfs:
enhanced to use this interface to release the memory reserved for enhanced to use this interface to release the memory reserved for
dump and continue without 2nd reboot. dump and continue without 2nd reboot.
/sys/kernel/fadump_release_opalcore
This file is available only on OPAL based machines when FADump is
active during capture kernel. This is used to release the memory
used by the kernel to export /sys/firmware/opal/core file. To
release this memory, echo '1' to it:
echo 1 > /sys/kernel/fadump_release_opalcore
Here is the list of files under powerpc debugfs: Here is the list of files under powerpc debugfs:
(Assuming debugfs is mounted on /sys/kernel/debug directory.) (Assuming debugfs is mounted on /sys/kernel/debug directory.)