linux-kernel - Re: [PATCH v8 2/3] API to verify the STOP API and image compatibility

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Date:   Wed, 29 Apr 2020 19:35:33 +0530
From:   Vaidyanathan Srinivasan <svaidy@...ux.ibm.com>
To:     Pratik Rajesh Sampat <psampat@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
        mpe@...erman.id.au, skiboot@...ts.ozlabs.org, oohall@...il.com,
        ego@...ux.vnet.ibm.com, linuxram@...ibm.com,
        pratik.r.sampat@...il.com
Subject: Re: [PATCH v8 2/3] API to verify the STOP API and image compatibility

* Pratik Rajesh Sampat <psampat@...ux.ibm.com> [2020-04-23 16:24:37]:

> From: Prem Shanker Jha <premjha2@...ibm.com>
> 
> Commit defines a new API primarily intended for OPAL to determine
> cpu register save API's compatibility with HOMER layout and
> self save restore. It can help OPAL determine if version of
> API integrated with OPAL is different from hostboot.
> 
> Change-Id: Ic0de45a336cfb8b6b6096a10ac1cd3ffbaa44fc0
> Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/77612
> Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@...ibm.com>
> Tested-by: Jenkins Server <pfd-jenkins+hostboot@...ibm.com>
> Tested-by: Hostboot CI <hostboot-ci+hostboot@...ibm.com>
> Reviewed-by: RANGANATHPRASAD G. BRAHMASAMUDRA <prasadbgr@...ibm.com>
> Reviewed-by: Gregory S Still <stillgs@...ibm.com>
> Reviewed-by: Jennifer A Stofer <stofer@...ibm.com>
> Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/77614
> Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@...ibm.com>
> Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@...ibm.com>
> Reviewed-by: Daniel M Crowell <dcrowell@...ibm.com>
> Signed-off-by: Pratik Rajesh Sampat <psampat@...ux.ibm.com>

Reviewed-by: Vaidyanathan Srinivasan <svaidy@...ux.ibm.com>

> ---
>  include/p9_stop_api.H                    | 25 ++++++++++
>  libpore/p9_cpu_reg_restore_instruction.H |  7 ++-
>  libpore/p9_hcd_memmap_base.H             |  7 +++
>  libpore/p9_stop_api.C                    | 58 +++++++++++++++++++++++-
>  libpore/p9_stop_api.H                    | 26 ++++++++++-
>  libpore/p9_stop_util.H                   | 20 ++++----
>  6 files changed, 130 insertions(+), 13 deletions(-)

This stop-api code will help OPAL check and use self-save functions so
that different versions of OPAL can be loaded and run with different
versions of low level firmware stack.

--Vaidy