linux-kernel - Re: [PATCH v6 2/2] acpi: apei: Do not panic() on PCIe errors reported through GHES

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Message-ID: <cf2e0a02-fb99-efde-0b41-63585c9d8844@gmail.com>
Date:   Tue, 22 May 2018 10:18:02 -0500
From:   "Alex G." <mr.nuke.me@...il.com>
To:     Tyler Baicar <tbaicar@...eaurora.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Borislav Petkov <bp@...en8.de>, alex_gagniuc@...lteam.com,
        austin_bolen@...l.com, shyam_iyer@...l.com,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Tony Luck <tony.luck@...el.com>,
        Will Deacon <will.deacon@....com>,
        James Morse <james.morse@....com>,
        Shiju Jose <shiju.jose@...wei.com>,
        "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>,
        Dongjiu Geng <gengdongjiu@...wei.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 2/2] acpi: apei: Do not panic() on PCIe errors reported
 through GHES



On 05/22/2018 10:15 AM, Tyler Baicar wrote:
> On 5/22/2018 10:32 AM, Alex G. wrote:
>> I think the biggest problem is having a policy to panic on "fatal"
>> errors, instead of letting the error handler make that decision. I'd
>> much rather kill that stupid policy, but people seem to like it for some
>> reason.
>>
> You can get around that panic and still have the error handled as
> AER_FATAL in
> the current code. Your FW needs to mark the error as RECOVERABLE and then
> set the CPER_SEC_RESET flag.

Of course, that would be ideal. But experience shows that firmware
doesn't do this. That's the whole point: firmware sends questionable data.

Alex

> https://elixir.bootlin.com/linux/v4.17-rc6/source/drivers/acpi/apei/ghes.c#L450
> 
> 
> Thanks,
> Tyler
>