linux-kernel - Re: [PATCH V3 2/2] acpi: apei: call into AER handling regardless of severity

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Date:   Mon, 13 Nov 2017 10:34:58 -0500
From:   Tyler Baicar <tbaicar@...eaurora.org>
To:     Dongdong Liu <liudongdong3@...wei.com>, rjw@...ysocki.net,
        tony.luck@...el.com, bp@...en8.de, bp@...e.de, will.deacon@....com,
        james.morse@....com, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>
Subject: Re: [PATCH V3 2/2] acpi: apei: call into AER handling regardless of
 severity

On 11/13/2017 7:36 AM, Dongdong Liu wrote:
>
> 在 2017/11/9 3:13, Tyler Baicar 写道:
>> Currently the GHES code only calls into the AER driver for
>> recoverable type errors. This is incorrect because errors of
>> other severities do not get logged by the AER driver and do not
>> get exposed to user space via the AER trace event. So, call
>> into the AER driver for PCIe errors regardless of the severity
>
> It will also call do_recovery() regardless of the severity for AER correctable 
> errors.
> Correctable errors include those error conditions where hardware can recover 
> without any loss of information.
> Hardware corrects these errors and software intervention is not required.
> So we'd better modify the code as below.
> diff --git a/drivers/pci/pcie/aer/aerdrv_core.c 
> b/drivers/pci/pcie/aer/aerdrv_core.c
> index 7448052..a7f77549 100644
> --- a/drivers/pci/pcie/aer/aerdrv_core.c
> +++ b/drivers/pci/pcie/aer/aerdrv_core.c
> @@ -633,7 +633,8 @@ static void aer_recover_work_func(struct work_struct *work)
>                         continue;
>                 }
>                 cper_print_aer(pdev, entry.severity, entry.regs);
> -           do_recovery(pdev, entry.severity);
> +         if(entry.severity != AER_CORRECTABLE)
> +                 do_recovery(pdev, entry.severity);
>                 pci_dev_put(pdev);
>         }
>  }
Hello Dongdong,

Yes, I have a patch for this that needs to be picked up.

https://lkml.org/lkml/2017/8/28/848

Thanks,
Tyler

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