linux-kernel - Re: [PATCH v2 00/13] Qcom: LLCC/EDAC: Fix base address used for LLCC banks

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Date:   Mon, 12 Dec 2022 13:23:40 -0600
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, bp@...en8.de,
        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
Subject: Re: [PATCH v2 00/13] Qcom: LLCC/EDAC: Fix base address used for LLCC
 banks

On Mon, Dec 12, 2022 at 06:02:58PM +0530, Manivannan Sadhasivam wrote:
> The Qualcomm LLCC/EDAC drivers were using a fixed register stride for
> accessing the (Control and Status Regsiters) CSRs of each LLCC bank.
> This offset 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 with the current drivers. So far this crash is not reported since
> EDAC_QCOM driver is not enabled in ARM64 defconfig and no one tested the
> driver extensively by triggering the EDAC IRQ (that's where each bank
> CSRs are accessed).
>
> For fixing this issue, let's obtain the base address of each LLCC bank from
> devicetree and get rid of the fixed stride.
>
> This series affects multiple platforms but I have only tested this on
> SM8250 and SM8450. Testing on other platforms is welcomed.
>

Tested-by: Andrew Halaney <ahalaney@...hat.com> # sa8540p-ride

I took this for a quick spin on the qdrive3 I've got access to without
any issue:

    [root@...alhost ~]# modprobe qcom_edac
    [root@...alhost ~]# dmesg | grep -i edac
    [    0.620723] EDAC MC: Ver: 3.0.0
    [    1.165417] ghes_edac: GHES probing device list is empty
    [  594.688103] EDAC DEVICE0: Giving out device to module qcom_llcc_edac controller llcc: DEV qcom_llcc_edac (INTERRUPT)
    [root@...alhost ~]# cat /proc/interrupts | grep ecc
    174:          0          0          0          0          0          0          0          0     GICv3 614 Level     llcc_ecc
    [root@...alhost ~]#

Potentially stupid question, but are users expected to manually load the
driver as I did? I don't see how it would be loaded automatically in the
current state, but thought it was funny that I needed to modprobe
myself.

Please let me know if you want me to do any more further testing!

Thanks,
Andrew