linux-kernel - Re: [PATCH V1] PCI/AER: Configure ECRC only AER is native

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Message-ID: <1f1b328d-9324-dac9-a59c-13b5cda0bc8e@nvidia.com>
Date:   Thu, 12 Jan 2023 12:42:54 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Bjorn Helgaas <helgaas@...nel.org>
Cc:     bhelgaas@...gle.com, ruscur@...sell.cc, oohall@...il.com,
        treding@...dia.com, jonathanh@...dia.com, mmaddireddy@...dia.com,
        kthota@...dia.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, vsethi@...dia.com,
        linuxppc-dev@...ts.ozlabs.org, sagar.tv@...il.com
Subject: Re: [PATCH V1] PCI/AER: Configure ECRC only AER is native



On 1/12/2023 10:36 AM, Sathyanarayanan Kuppuswamy wrote:
> External email: Use caution opening links or attachments
> 
> 
> On 1/11/23 8:59 PM, Vidya Sagar wrote:
>>
>>
>> On 1/12/2023 9:18 AM, Sathyanarayanan Kuppuswamy wrote:
>>> External email: Use caution opening links or attachments
>>>
>>>
>>> On 1/11/23 7:33 PM, Vidya Sagar wrote:
>>>> I think we still need bios option. For example, consider a system where BIOS needs to keep ECRC enabled for integrity reasons but if kernel doesn't want it for perf reasons, then, kernel can always use 'ecrc=off' option.
>>>
>>> I agree that "on" and "off" option makes sense. Since the kernel defaults ecrc setting to "bios", why again allow it as a command line option?
>>
>> Agree. "on" and "off" are fine but "default" is redundant. Do you want me to push a change to remove that as part of this patch itself? I think
>> it is more like a cleanup and should go separately.
> 
> IMO, the "bios" option cleanup and command line update from Bjorn can be in one patch, and your change could be a separate patch. But it is
> up to you and Bjorn.

I think Bjorn's command line suggestion should go along with my patch 
otherwise the ECRC control through command line doesn't work if OS 
doesn't own the AER. So, it helps to make it explicit that the 'ecrc=' 
option works only if either kernel has native AER control or 
'pcie_ports' is set to 'native'

> 
>>
>>>
>>> --
>>> Sathyanarayanan Kuppuswamy
>>> Linux Kernel Developer
> 
> --
> Sathyanarayanan Kuppuswamy
> Linux Kernel Developer