linux-kernel - Re: [PATCH 1/2] iommu/arm-smmu-qcom: Fix missing adreno

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Date:   Thu, 4 May 2023 11:08:02 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     dri-devel@...ts.freedesktop.org, iommu@...ts.linux-foundation.org,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...omium.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Sai Prakash Ranjan <quic_saipraka@...cinc.com>,
        Bjorn Andersson <quic_bjorande@...cinc.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        "moderated list:ARM SMMU DRIVERS" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:IOMMU SUBSYSTEM" <iommu@...ts.linux.dev>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] iommu/arm-smmu-qcom: Fix missing adreno_smmu's

On Thu, May 4, 2023 at 10:41 AM Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>
>
>
> On 2.05.2023 18:09, Rob Clark wrote:
> > From: Rob Clark <robdclark@...omium.org>
> >
> > When the special handling of qcom,adreno-smmu was moved into
> > qcom_smmu_create(), it was overlooked that we didn't have all the
> > required entries in qcom_smmu_impl_of_match.  So we stopped getting
> > adreno_smmu_priv on sc7180, breaking per-process pgtables.
> >
> > Fixes: 30b912a03d91 ("iommu/arm-smmu-qcom: Move the qcom,adreno-smmu check into qcom_smmu_create")
> > Signed-off-by: Rob Clark <robdclark@...omium.org>
> > ---
> I believe the issue here is the lack of qcom,sc7180-smmu-v2 instead.
>
> qcom,adreno-smmu does not have to imply the "qcom smmu v2" impl

Yes, but the ordering after "qcom,smmu-500" does.  Currently we just
need the one missing "qcom,sc7180-smmu-v2" but that seemed kind of
fragile to me, which is why I went with "qcom,adreno-smmu" as a
catch-all

BR,
-R

>
> Konrad
> >  drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> > index d1b296b95c86..88c89424485b 100644
> > --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> > +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> > @@ -512,20 +512,25 @@ static const struct of_device_id __maybe_unused qcom_smmu_impl_of_match[] = {
> >       { .compatible = "qcom,sm6115-smmu-500", .data = &qcom_smmu_500_impl0_data},
> >       { .compatible = "qcom,sm6125-smmu-500", .data = &qcom_smmu_500_impl0_data },
> >       { .compatible = "qcom,sm6350-smmu-v2", .data = &qcom_smmu_v2_data },
> >       { .compatible = "qcom,sm6350-smmu-500", .data = &qcom_smmu_500_impl0_data },
> >       { .compatible = "qcom,sm6375-smmu-500", .data = &qcom_smmu_500_impl0_data },
> >       { .compatible = "qcom,sm8150-smmu-500", .data = &qcom_smmu_500_impl0_data },
> >       { .compatible = "qcom,sm8250-smmu-500", .data = &qcom_smmu_500_impl0_data },
> >       { .compatible = "qcom,sm8350-smmu-500", .data = &qcom_smmu_500_impl0_data },
> >       { .compatible = "qcom,sm8450-smmu-500", .data = &qcom_smmu_500_impl0_data },
> >       { .compatible = "qcom,smmu-500", .data = &qcom_smmu_500_impl0_data },
> > +     /*
> > +      * Should come after the qcom,smmu-500 fallback so smmu-500 variants of
> > +      * adreno-smmu get qcom_adreno_smmu_500_impl:
> > +      */
> > +     { .compatible = "qcom,adreno-smmu", .data = &qcom_smmu_v2_data },
> >       { }
> >  };
> >
> >  #ifdef CONFIG_ACPI
> >  static struct acpi_platform_list qcom_acpi_platlist[] = {
> >       { "LENOVO", "CB-01   ", 0x8180, ACPI_SIG_IORT, equal, "QCOM SMMU" },
> >       { "QCOM  ", "QCOMEDK2", 0x8180, ACPI_SIG_IORT, equal, "QCOM SMMU" },
> >       { }
> >  };
> >  #endif