linux-kernel - Re: [RFC PATCH 00/11] Affirm SMMU coherent pagetable walker capability on RPMh SoCs

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Message-ID: <CAKXuJqj=5wZg2+EZOmbS4TjrvqNm9UhsqeSPHZyVbOLnir_juA@mail.gmail.com>
Date: Thu, 19 Sep 2024 13:48:37 -0500
From: Steev Klimaszewski <steev@...i.org>
To: Konrad Dybcio <konradybcio@...nel.org>
Cc: Luca Weiss <luca.weiss@...rphone.com>, Bjorn Andersson <andersson@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	cros-qcom-dts-watchers@...omium.org, 
	Marijn Suijten <marijn.suijten@...ainline.org>, linux-arm-msm@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Konrad Dybcio <quic_kdybcio@...cinc.com>
Subject: Re: [RFC PATCH 00/11] Affirm SMMU coherent pagetable walker
 capability on RPMh SoCs

Hi Konrad,

On Thu, Sep 19, 2024 at 5:07 AM Konrad Dybcio <konradybcio@...nel.org> wrote:
>
> On 19.09.2024 9:00 AM, Luca Weiss wrote:
> > On Thu Sep 19, 2024 at 12:57 AM CEST, Konrad Dybcio wrote:
> >> I only read back the SMMU config on X1E & 7280, but I have it on good
> >> authority that this concerns all RPMh SoCs. Sending as RFC just in case.
> >>
> >> Lacking coherency can hurt performance, but claiming coherency where it's
> >> absent would lead to a kaboom.
> >
> > Hi Konrad!
> >
> > You want people with the affected SoCs to test this I imagine?
>
> Yeah, would be nice to confirm
>
> >
> > Just boot it and see if it doesn't implode, or do you have any more
> > elaborate test plan for this?
>
> No, booting should be enough of a test
>
> Konrad

I have tested sc8280xp on the Thinkpad X13s.  It still boots and
nothing seems to be more broken than usual (kidding, it seems to be
running exactly as it was before the patchset was applied.)  I will
try to find the time to test sc8180x on a Flex 5G as well as the
sdm845 on the Lenovo Yoga C630, but I can't promise I'll find the
time.

Tested-by: Steev Klimaszewski <steev@...i.org> # Thinkpad X13s (sc8280xp)