linux-kernel - Re: [PATCH v2] ACPI: APEI: EINJ: EINJV2 support added

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Message-ID: <ZPD8ggCD794f54VR@zaid-VirtualBox>
Date:   Thu, 31 Aug 2023 13:48:02 -0700
From:   Zaid Alali <zaidal@...amperecomputing.com>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Piyush Malgujar <pmalgujar@...vell.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "xueshuai@...ux.alibaba.com" <xueshuai@...ux.alibaba.com>,
        "benjamin.cheatham@....com" <benjamin.cheatham@....com>,
        "bp@...en8.de" <bp@...en8.de>,
        "james.morse@....com" <james.morse@....com>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "jannadurai@...vell.com" <jannadurai@...vell.com>,
        "cchavva@...vell.com" <cchavva@...vell.com>
Subject: Re: [PATCH v2] ACPI: APEI: EINJ: EINJV2 support added

On Thu, May 04, 2023 at 09:00:51PM +0000, Luck, Tony wrote:
> > +An error injection example::
> > +
> > +  # cd /sys/kernel/debug/apei/einj
> > +  # cat available_error_type         # See which errors can be injected
> > +  0x00000001 EINJV2 Processor Error
> > +  0x00000002 EINJV2 Memory Error
> > +  0x00000004 EINJV2 PCI Express Error
> > +  # echo 0x2 > error_type
> > +  # echo 0x5 > flags
> > +  # echo 0x12345000 > param1
> > +  # echo 0x2 > param5
> > +  # echo 1 > error_inject
> >
> > Is the expectation that platforms that implement EINJV2 will not include legacy
> > EINJ support?
> 
> I spoke to some BIOS folks here. They said that the ACPI 6.5 change is an
> extension to the action table with new opcodes for GET/SET when EINJV2
> is supported. The legacy actions are not deprecated. So platform firmware could
> support both old and new injection formats.
> 
> So I'm going to double down on this:
> 
> > Maybe it would be better to change the top-level directory to:
> >
> >	/sys/kernel/debug/apei/einjv2
I also think this is the best way to go to have EINJ and EINJv2 supported.
Is anyone working on implementing this? or should I give it a shot and try to
send a patch that separates the parent directory for EINJv2?
> 
> and say this isn't a "maybe". The EINJV2 interface files should go
> in a new directory. The old files should continue to work (assuming
> firmware still enumerates the old available types).
> 
> Simplifying the interface for EINJV2 in the new directory is an option.
> I think we should take it ... the "paramN" files that mean different
> things for different injection types were an evolution rather than a design.
> 
> -Tony
> 
> 
> 
>