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

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Date:   Mon, 12 Dec 2022 18:02:58 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, bp@...en8.de,
        tony.luck@...el.com
Cc:     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,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v2 00/13] Qcom: LLCC/EDAC: Fix base address used for LLCC banks

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.

Thanks,
Mani

Changes in v2:

* Removed reg-names property and used index of reg property to parse LLCC
  bank base address (Bjorn)
* Collected Ack from Sai for binding
* Added a new patch for polling mode (Luca)
* Renamed subject of patches targeting SC7180 and SM6350

Manivannan Sadhasivam (13):
  dt-bindings: arm: msm: Update the maintainers for LLCC
  dt-bindings: arm: msm: Fix register regions used for LLCC banks
  arm64: dts: qcom: sdm845: Fix the base addresses of LLCC banks
  arm64: dts: qcom: sc7180: Remove reg-names property from LLCC node
  arm64: dts: qcom: sc7280: Fix the base addresses of LLCC banks
  arm64: dts: qcom: sc8280xp: Fix the base addresses of LLCC banks
  arm64: dts: qcom: sm8150: Fix the base addresses of LLCC banks
  arm64: dts: qcom: sm8250: Fix the base addresses of LLCC banks
  arm64: dts: qcom: sm8350: Fix the base addresses of LLCC banks
  arm64: dts: qcom: sm8450: Fix the base addresses of LLCC banks
  arm64: dts: qcom: sm6350: Remove reg-names property from LLCC node
  qcom: llcc/edac: Fix the base address used for accessing LLCC banks
  qcom: llcc/edac: Support polling mode for ECC handling

 .../bindings/arm/msm/qcom,llcc.yaml           | 100 +++++++++++++++---
 arch/arm64/boot/dts/qcom/sc7180.dtsi          |   1 -
 arch/arm64/boot/dts/qcom/sc7280.dtsi          |   4 +-
 arch/arm64/boot/dts/qcom/sc8280xp.dtsi        |   7 +-
 arch/arm64/boot/dts/qcom/sdm845.dtsi          |   5 +-
 arch/arm64/boot/dts/qcom/sm6350.dtsi          |   1 -
 arch/arm64/boot/dts/qcom/sm8150.dtsi          |   5 +-
 arch/arm64/boot/dts/qcom/sm8250.dtsi          |   5 +-
 arch/arm64/boot/dts/qcom/sm8350.dtsi          |   5 +-
 arch/arm64/boot/dts/qcom/sm8450.dtsi          |   5 +-
 drivers/edac/qcom_edac.c                      |  51 +++++----
 drivers/soc/qcom/llcc-qcom.c                  |  85 ++++++++-------
 include/linux/soc/qcom/llcc-qcom.h            |   6 +-
 13 files changed, 186 insertions(+), 94 deletions(-)

-- 
2.25.1