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

[Bhupesh Sharma]

On Thu, 8 Dec 2022 at 19:43, Dmitry Baryshkov
<dmitry.baryshkov@xxxxxxxxxx> wrote:
>
> On Thu, 8 Dec 2022 at 14:05, Bhupesh Sharma <bhupesh.sharma@xxxxxxxxxx> wrote:
> >
> > On Thu, 8 Dec 2022 at 16:14, Dmitry Baryshkov
> > <dmitry.baryshkov@xxxxxxxxxx> wrote:
> > >
> > > On Wed, 7 Dec 2022 at 09:29, Bhupesh Sharma <bhupesh.sharma@xxxxxxxxxx> 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?

That's a good question. But I have no test data points to say that
this should be valid for other platforms as well. Let me check with
the folks @ qcom who reported this, (i.e. whether they see this with
other qcom platforms as well), but let's not hold back this fix while
we wait for more data.

Thanks.

> > > > Fixes: a1c86c680533 ("arm64: dts: qcom: sm8150: Add PCIe nodes")
> > > > Cc: Bjorn Andersson <andersson@xxxxxxxxxx>
> > > > Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> > >
> > > No need to have regular maintainers in Cc tags. Please use regular
> > > git-send-email arguments instead.
> > >
> > > > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@xxxxxxxxxx>
> > > > ---
> > > >  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@1c00000 {
> > > >                                       "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@1c08000 {
> > > >                         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