linux-kernel - RE: [PATCHv3 2/2] drm/amdgpu: Register MCE notifier for Aldebaran RAS

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Message-ID: <DM4PR12MB526346B7ECC03951C33C0253EEA39@DM4PR12MB5263.namprd12.prod.outlook.com>
Date:   Thu, 23 Sep 2021 15:31:24 +0000
From:   "Joshi, Mukul" <Mukul.Joshi@....com>
To:     Borislav Petkov <bp@...en8.de>,
        "Ghannam, Yazen" <Yazen.Ghannam@....com>
CC:     "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>
Subject: RE: [PATCHv3 2/2] drm/amdgpu: Register MCE notifier for Aldebaran RAS

[AMD Official Use Only]



> -----Original Message-----
> From: Borislav Petkov <bp@...en8.de>
> Sent: Thursday, September 23, 2021 10:37 AM
> To: Ghannam, Yazen <Yazen.Ghannam@....com>
> Cc: Joshi, Mukul <Mukul.Joshi@....com>; linux-edac@...r.kernel.org;
> x86@...nel.org; linux-kernel@...r.kernel.org; mingo@...hat.com;
> mchehab@...nel.org; amd-gfx@...ts.freedesktop.org
> Subject: Re: [PATCHv3 2/2] drm/amdgpu: Register MCE notifier for Aldebaran
> RAS
> 
> [CAUTION: External Email]
> 
> On Thu, Sep 23, 2021 at 02:29:07PM +0000, Yazen Ghannam wrote:
> > > +   /*
> > > +    * If the error was generated in UMC_V2, which belongs to GPU UMCs,
> > > +    * and error occurred in DramECC (Extended error code = 0) then only
> > > +    * process the error, else bail out.
> > > +    */
> > > +   if (!m || !((smca_get_bank_type(m->bank) == SMCA_UMC_V2) &&
> > > +               (XEC(m->status, 0x1f) == 0x0)))
> >
> > The MCA_STATUS[ErrorCodeExt] field is bits [21:16], so the mask should
> > be 0x3f.
> >
> > > +           return NOTIFY_DONE;
> > > +
> > > +   /*
> > > +    * If it is correctable error, return.
> > > +    */
> > > +   if (mce_is_correctable(m))
> > > +           return NOTIFY_OK;
> >
> > Shouldn't this be "NOTIFY_DONE" if "don't care" about this error?
> 
> I think the logic here is to stop calling any further consumers on the notify chain
> because this is a GPU correctable error and they can't do anything about it
> anyway, right?

That's correct.

Regards,
Mukul

> 
> Or am I misreading it?
> 
> --
> Regards/Gruss,
>     Boris.
> 
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