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| author |   Hari Bathini <hbathini@linux.ibm.com> | 2019-09-11 20:26:03 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-09-14 00:04:45 +1000 |
| commit | bec53196adf4791d466adf0e339b61186c7b5283 (patch) | |
| tree | d21c6ffd50038faa23011ca14fddeecaabdb6fbc /arch/powerpc/Kconfig | |
| parent | powerpc/fadump: improve how crashed kernel's memory is reserved (diff) | |
| download | wireguard-linux-bec53196adf4791d466adf0e339b61186c7b5283.tar.xz wireguard-linux-bec53196adf4791d466adf0e339b61186c7b5283.zip | |
powerpc/fadump: add support to preserve crash data on FADUMP disabled kernel
Add a new kernel config option, CONFIG_PRESERVE_FA_DUMP that ensures
that crash data, from previously crash'ed kernel, is preserved. This
helps in cases where FADump is not enabled but the subsequent memory
preserving kernel boot is likely to process this crash data. One
typical usecase for this config option is petitboot kernel.
As OPAL allows registering address with it in the first kernel and
retrieving it after MPIPL, use it to store the top of boot memory.
A kernel that intends to preserve crash data retrieves it and avoids
using memory beyond this address.
Move arch_reserved_kernel_pages() function as it is needed for both
FA_DUMP and PRESERVE_FA_DUMP configurations.
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821375751.5656.11459483669542541602.stgit@hbathini.in.ibm.com
Diffstat (limited to 'arch/powerpc/Kconfig')
| -rw-r--r-- | arch/powerpc/Kconfig | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 375ff893fa60..62c483133953 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -583,6 +583,15 @@ config FA_DUMP If unsure, say "y". Only special kernels like petitboot may need to say "N" here. +config PRESERVE_FA_DUMP + bool "Preserve Firmware-assisted dump" + depends on PPC64 && PPC_POWERNV && !FA_DUMP + help + On a kernel with FA_DUMP disabled, this option helps to preserve + crash data from a previously crash'ed kernel. Useful when the next + memory preserving kernel boot would process this crash data. + Petitboot kernel is the typical usecase for this option. + config IRQ_ALL_CPUS bool "Distribute interrupts on all CPUs by default" depends on SMP |