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| author | Sourabh Jain <sourabhjain@linux.ibm.com> | 2019-12-11 21:39:08 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-02-19 21:07:10 +1100 |
| commit | 8852c07a881b0acfd3d75cf3927adaab815c4ee5 (patch) | |
| tree | c734590f47ec59d8109ed40c484dd5ef34e75d42 /Documentation/powerpc | |
| parent | d418b19f34ed0c751a69810080596f7e749595aa (diff) | |
| download | lwn-8852c07a881b0acfd3d75cf3927adaab815c4ee5.tar.gz lwn-8852c07a881b0acfd3d75cf3927adaab815c4ee5.zip | |
powerpc/powernv: Move core and fadump_release_opalcore under new kobject
The /sys/firmware/opal/core and /sys/kernel/fadump_release_opalcore
sysfs files are used to export and release the OPAL memory on PowerNV
platform. let's organize them into a new kobject under
/sys/firmware/opal/mpipl/ directory.
A symlink is added to maintain the backward compatibility for
/sys/firmware/opal/core 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/20191211160910.21656-5-sourabhjain@linux.ibm.com
Diffstat (limited to 'Documentation/powerpc')
| -rw-r--r-- | Documentation/powerpc/firmware-assisted-dump.rst | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/Documentation/powerpc/firmware-assisted-dump.rst b/Documentation/powerpc/firmware-assisted-dump.rst index 0455a78486d5..345a3405206e 100644 --- a/Documentation/powerpc/firmware-assisted-dump.rst +++ b/Documentation/powerpc/firmware-assisted-dump.rst @@ -112,13 +112,13 @@ 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 + exported as /sys/firmware/opal/mpipl/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. + '1' to /sys/firmware/opal/mpipl/release_core node. e.g. - # echo 1 > /sys/kernel/fadump_release_opalcore + # echo 1 > /sys/firmware/opal/mpipl/release_core Implementation details: ----------------------- @@ -283,14 +283,17 @@ Here is the list of files under kernel sysfs: enhanced to use this interface to release the memory reserved for dump and continue without 2nd reboot. - /sys/kernel/fadump_release_opalcore +Note: /sys/kernel/fadump_release_opalcore sysfs has moved to + /sys/firmware/opal/mpipl/release_core + + /sys/firmware/opal/mpipl/release_core 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 + used by the kernel to export /sys/firmware/opal/mpipl/core file. To release this memory, echo '1' to it: - echo 1 > /sys/kernel/fadump_release_opalcore + echo 1 > /sys/firmware/opal/mpipl/release_core Here is the list of files under powerpc debugfs: (Assuming debugfs is mounted on /sys/kernel/debug directory.) |