linux-kernel - Re: [PATCH v5 15/17] qcom: llcc/edac: Fix the base address used for accessing LLCC banks

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Message-ID: <20230115040122.GA6568@thinkpad>
Date:   Sun, 15 Jan 2023 09:31:22 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, tony.luck@...el.com,
        quic_saipraka@...cinc.com, konrad.dybcio@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        james.morse@....com, mchehab@...nel.org, rric@...nel.org,
        linux-edac@...r.kernel.org, quic_ppareek@...cinc.com,
        luca.weiss@...rphone.com, ahalaney@...hat.com, steev@...i.org
Subject: Re: [PATCH v5 15/17] qcom: llcc/edac: Fix the base address used for
 accessing LLCC banks

On Sat, Jan 14, 2023 at 02:27:50PM +0100, Borislav Petkov wrote:
> On Wed, Dec 28, 2022 at 02:10:26PM +0530, Manivannan Sadhasivam wrote:
> > The Qualcomm LLCC/EDAC drivers were using a fixed register stride for
> > accessing the (Control and Status Registers) CSRs of each LLCC bank.
> > This stride only works for some SoCs like SDM845 for which driver
> > support was initially added.
> > 
> > But the later SoCs use different register stride that vary between the
> > banks with holes in-between. So it is not possible to use a single register
> > stride for accessing the CSRs of each bank. By doing so could result in a
> > crash.
> 
> If this patch fixes a crash, then it should be
> 
> Cc: <stable@...nel.org>
> 
> If there are prerequisites to it, they should be CC:stable too.
> 

That's what I did in previous revision but then Krzysztof reported that
backporting would break old DTs. See discussion on v2:
https://lore.kernel.org/lkml/20221212123311.146261-1-manivannan.sadhasivam@linaro.org/

Thanks,
Mani

> So looking at the urgent stuff: patches 1, 3, I'm thinking I can take them
> through the EDAC tree and send them to Linus now, after you've addressed the
> review comments.
> 
> This one can go through some other tree, I presume, but since it fixes a crash
> it should go in now too...
> 
> > For fixing this issue, let's obtain the base address of each LLCC bank from
> > devicetree and get rid of the fixed stride. This also means, we no longer
> 
> Please use passive voice in your commit message: no "we" or "I", etc,
> and describe your changes in imperative mood.
> 
> Personal pronouns are ambiguous in text, especially with so many
> parties/companies/etc developing the kernel so let's avoid them please.
> 
> > need to rely on reg-names property and get the base addresses using index.
> > 
> > First index is LLCC bank 0 and last index is LLCC broadcast. If the SoC
> > supports more than one bank, then those needs to be defined in devicetree
> 
> s/needs/need/
> 
> > for index from 1..N-1.
> > 
> > Reported-by: Parikshit Pareek <quic_ppareek@...cinc.com>
> > Tested-by: Luca Weiss <luca.weiss@...rphone.com>
> > Tested-by: Steev Klimaszewski <steev@...i.org> # Thinkpad X13s
> > Tested-by: Andrew Halaney <ahalaney@...hat.com> # sa8540p-ride
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> With the above addressed, for the EDAC bits:
> 
> Reviewed-by: Borislav Petkov (AMD) <bp@...en8.de>
> 
> Thx.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette

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