linux-kernel - Re: [PATCH] arm64: dts: qcom: sm8150: Fix iommu sid values for PCIe nodes

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Date:   Thu, 8 Dec 2022 17:13:20 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        agross@...nel.org, bhupesh.linux@...il.com,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        krzysztof.kozlowski@...aro.org, konrad.dybcio@...aro.org,
        andersson@...nel.org
Subject: Re: [PATCH] arm64: dts: qcom: sm8150: Fix iommu sid values for PCIe nodes

On Thu, 8 Dec 2022 at 14:05, Bhupesh Sharma <bhupesh.sharma@...aro.org> wrote:
>
> On Thu, 8 Dec 2022 at 16:14, Dmitry Baryshkov
> <dmitry.baryshkov@...aro.org> wrote:
> >
> > On Wed, 7 Dec 2022 at 09:29, Bhupesh Sharma <bhupesh.sharma@...aro.org> wrote:
> > >
> > > Fix the iommu sid values for the PCIe nodes present on
> > > Qualcomm SM8150 SoC dtsi (in sync the with downstream code).
> >
> > The commit message describes what you did, not why. Is there any
> > actual issue that you are trying to solve?
>
> Right, I will add that in v2. We have a customer facing some sid
> related IOMMU transactional errors on sm8150 based boards.
>
> > It makes me wonder because all modern Qualcomm platforms share more or
> > less the same setup.
>
> Please see sdm845.dtsi, which does the same as suggested via this
> patch for sm8150.

Should we also apply the same change to other platforms?

>
> Thanks,
> Bhupesh
>
> > > Fixes: a1c86c680533 ("arm64: dts: qcom: sm8150: Add PCIe nodes")
> > > Cc: Bjorn Andersson <andersson@...nel.org>
> > > Cc: Rob Herring <robh+dt@...nel.org>
> >
> > No need to have regular maintainers in Cc tags. Please use regular
> > git-send-email arguments instead.
> >
> > > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> > > ---
> > >  arch/arm64/boot/dts/qcom/sm8150.dtsi | 32 ++++++++++++++++++++++++++--
> > >  1 file changed, 30 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > > index d1b64280ab0b..e88d1617a1ab 100644
> > > --- a/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > > +++ b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > > @@ -1810,9 +1810,23 @@ pcie0: pci@...0000 {
> > >                                       "slave_q2a",
> > >                                       "tbu";
> > >
> > > -                       iommus = <&apps_smmu 0x1d80 0x7f>;
> > > +                       iommus = <&apps_smmu 0x1d80 0xf>;
> > >                         iommu-map = <0x0   &apps_smmu 0x1d80 0x1>,
> > >                                     <0x100 &apps_smmu 0x1d81 0x1>;
> >
> > it looks like the patch was not even compile-tested.
> >
> > > +                                   <0x200 &apps_smmu 0x1d82 0x1>,
> > > +                                   <0x300 &apps_smmu 0x1d83 0x1>,
> > > +                                   <0x400 &apps_smmu 0x1d84 0x1>,
> > > +                                   <0x500 &apps_smmu 0x1d85 0x1>,
> > > +                                   <0x600 &apps_smmu 0x1d86 0x1>,
> > > +                                   <0x700 &apps_smmu 0x1d87 0x1>,
> > > +                                   <0x800 &apps_smmu 0x1d88 0x1>,
> > > +                                   <0x900 &apps_smmu 0x1d89 0x1>,
> > > +                                   <0xa00 &apps_smmu 0x1d8a 0x1>,
> > > +                                   <0xb00 &apps_smmu 0x1d8b 0x1>,
> > > +                                   <0xc00 &apps_smmu 0x1d8c 0x1>,
> > > +                                   <0xd00 &apps_smmu 0x1d8d 0x1>,
> > > +                                   <0xe00 &apps_smmu 0x1d8e 0x1>,
> > > +                                   <0xf00 &apps_smmu 0x1d8f 0x1>;
> > >
> > >                         resets = <&gcc GCC_PCIE_0_BCR>;
> > >                         reset-names = "pci";
> > > @@ -1909,9 +1923,23 @@ pcie1: pci@...8000 {
> > >                         assigned-clocks = <&gcc GCC_PCIE_1_AUX_CLK>;
> > >                         assigned-clock-rates = <19200000>;
> > >
> > > -                       iommus = <&apps_smmu 0x1e00 0x7f>;
> > > +                       iommus = <&apps_smmu 0x1e00 0xf>;
> > >                         iommu-map = <0x0   &apps_smmu 0x1e00 0x1>,
> > >                                     <0x100 &apps_smmu 0x1e01 0x1>;
> > > +                                   <0x200 &apps_smmu 0x1e02 0x1>,
> > > +                                   <0x300 &apps_smmu 0x1e03 0x1>,
> > > +                                   <0x400 &apps_smmu 0x1e04 0x1>,
> > > +                                   <0x500 &apps_smmu 0x1e05 0x1>,
> > > +                                   <0x600 &apps_smmu 0x1e06 0x1>,
> > > +                                   <0x700 &apps_smmu 0x1e07 0x1>,
> > > +                                   <0x800 &apps_smmu 0x1e08 0x1>,
> > > +                                   <0x900 &apps_smmu 0x1e09 0x1>,
> > > +                                   <0xa00 &apps_smmu 0x1e0a 0x1>,
> > > +                                   <0xb00 &apps_smmu 0x1e0b 0x1>,
> > > +                                   <0xc00 &apps_smmu 0x1e0c 0x1>,
> > > +                                   <0xd00 &apps_smmu 0x1e0d 0x1>,
> > > +                                   <0xe00 &apps_smmu 0x1e0e 0x1>,
> > > +                                   <0xf00 &apps_smmu 0x1e0f 0x1>;
> > >
> > >                         resets = <&gcc GCC_PCIE_1_BCR>;
> > >                         reset-names = "pci";
> > > --
> > > 2.38.1
> > >
> >
> >
> > --
> > With best wishes
> > Dmitry



-- 
With best wishes
Dmitry