Date:   Thu, 02 Mar 2023 23:25:37 +0000
Message-ID: <865ybizqfi.wl-maz@kernel.org>
From:   Marc Zyngier <maz@kernel.org>
To:     Aristeu Rozanski <aris@redhat.com>,
        Darren Hart <darren@os.amperecomputing.com>
Cc:     linux-kernel@vger.kernel.org
Subject: Re: Error reports at boot time in Ampere Altra machines since c733ebb7c
In-Reply-To: <20230302201732.pwnhg46mum6st2bv@redhat.com>
References: <20230302201732.pwnhg46mum6st2bv@redhat.com>
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On Thu, 02 Mar 2023 20:17:32 +0000,
Aristeu Rozanski <aris@redhat.com> wrote:
> 
> Hi Marc,
> 
> Since c733ebb7cb67d ("irqchip/gic-v3-its: Reset each ITS's BASERn
> register before probe"), Ampere Altra machines are reporting corrected
> errors during boot:
> 
> 	[    0.294334] HEST: Table parsing has been initialized.
> 	[    0.294397] sdei: SDEIv1.0 (0x0) detected in firmware.
> 	[    0.299622] {1}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 0
> 	[    0.299626] {1}[Hardware Error]: event severity: recoverable
> 	[    0.299629] {1}[Hardware Error]:  Error 0, type: recoverable
> 	[    0.299633] {1}[Hardware Error]:   section type: unknown, e8ed898d-df16-43cc-8ecc-54f060ef157f
> 	[    0.299638] {1}[Hardware Error]:   section length: 0x30
> 	[    0.299645] {1}[Hardware Error]:   00000000: 00000005 ec30000e 00080110 80001001  ......0.........
> 	[    0.299648] {1}[Hardware Error]:   00000010: 00000300 00000000 00000000 00000000  ................
> 	[    0.299650] {1}[Hardware Error]:   00000020: 00000000 00000000 00000000 00000000  ................
> 	[    0.299714] {2}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 3
> 	[    0.299716] {2}[Hardware Error]: event severity: recoverable
> 	[    0.299717] {2}[Hardware Error]:  Error 0, type: recoverable
> 	[    0.299718] {2}[Hardware Error]:   section type: unknown, e8ed898d-df16-43cc-8ecc-54f060ef157f
> 	[    0.299720] {2}[Hardware Error]:   section length: 0x30
> 	[    0.299722] {2}[Hardware Error]:   00000000: 40000005 ec30000e 00080110 80005001  ...@..0......P..
> 	[    0.299724] {2}[Hardware Error]:   00000010: 00000300 00000000 00000000 00000000  ................
> 	[    0.299726] {2}[Hardware Error]:   00000020: 00000000 00000000 00000000 00000000  ................
> 	[    0.299912] GHES: APEI firmware first mode is enabled by APEI bit.
> 
> Because the errors are being reported later in boot, it's hard to
> pinpoint exactly what's causing it without decoding the error information,
> which I currently don't know how to do it.

+ Darren

Hopefully someone at Ampere can decode this and tell us what is happening.

> There're no problems other than of course triggering tests because of
> the warnings.

It says "Hardware Error". In my book, that's pretty bad. Do you see
this on more than a single machine?

> Do you know what's going on here?

No idea. I haven't seen this on the Altra I have access to so far,

It could be related to firmware and/or things like power management,
but again, someone needs to help us with the error report above.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.