linux-kernel - Re: [PATCH v5 0/5] iommu/arm-smmu: adreno-smmu page fault handling

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Date:   Sun, 4 Jul 2021 11:20:43 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>," <iommu@...ts.linux-foundation.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Rob Clark <robdclark@...omium.org>,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Eric Anholt <eric@...olt.net>,
        "Isaac J. Manjarres" <isaacm@...eaurora.org>,
        Joerg Roedel <jroedel@...e.de>,
        John Stultz <john.stultz@...aro.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krishna Reddy <vdumpa@...dia.com>,
        "Kristian H. Kristensen" <hoegsberg@...gle.com>,
        Lee Jones <lee.jones@...aro.org>,
        "moderated list:ARM SMMU DRIVERS" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Robin Murphy <robin.murphy@....com>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Sharat Masetty <smasetty@...eaurora.org>,
        Will Deacon <will@...nel.org>,
        Zhenzhong Duan <zhenzhong.duan@...il.com>
Subject: Re: [PATCH v5 0/5] iommu/arm-smmu: adreno-smmu page fault handling

I suspect you are getting a dpu fault, and need:

https://lore.kernel.org/linux-arm-msm/CAF6AEGvTjTUQXqom-xhdh456tdLscbVFPQ+iud1H1gHc8A2=hA@mail.gmail.com/

I suppose Bjorn was expecting me to send that patch

BR,
-R

On Sun, Jul 4, 2021 at 5:53 AM Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> Hi,
>
> I've had splash screen disabled on my RB3. However once I've enabled it,
> I've got the attached crash during the boot on the msm/msm-next. It
> looks like it is related to this particular set of changes.
>
> On 11/06/2021 00:44, Rob Clark wrote:
> > From: Rob Clark <robdclark@...omium.org>
> >
> > This picks up an earlier series[1] from Jordan, and adds additional
> > support needed to generate GPU devcore dumps on iova faults.  Original
> > description:
> >
> > This is a stack to add an Adreno GPU specific handler for pagefaults. The first
> > patch starts by wiring up report_iommu_fault for arm-smmu. The next patch adds
> > a adreno-smmu-priv function hook to capture a handful of important debugging
> > registers such as TTBR0, CONTEXTIDR, FSYNR0 and others. This is used by the
> > third patch to print more detailed information on page fault such as the TTBR0
> > for the pagetable that caused the fault and the source of the fault as
> > determined by a combination of the FSYNR1 register and an internal GPU
> > register.
> >
> > This code provides a solid base that we can expand on later for even more
> > extensive GPU side page fault debugging capabilities.
> >
> > v5: [Rob] Use RBBM_STATUS3.SMMU_STALLED_ON_FAULT to detect case where
> >      GPU snapshotting needs to avoid crashdumper, and check the
> >      RBBM_STATUS3.SMMU_STALLED_ON_FAULT in GPU hang irq paths
> > v4: [Rob] Add support to stall SMMU on fault, and let the GPU driver
> >      resume translation after it has had a chance to snapshot the GPUs
> >      state
> > v3: Always clear FSR even if the target driver is going to handle resume
> > v2: Fix comment wording and function pointer check per Rob Clark
> >
> > [1] https://lore.kernel.org/dri-devel/20210225175135.91922-1-jcrouse@codeaurora.org/
> >
> > Jordan Crouse (3):
> >    iommu/arm-smmu: Add support for driver IOMMU fault handlers
> >    iommu/arm-smmu-qcom: Add an adreno-smmu-priv callback to get pagefault
> >      info
> >    drm/msm: Improve the a6xx page fault handler
> >
> > Rob Clark (2):
> >    iommu/arm-smmu-qcom: Add stall support
> >    drm/msm: devcoredump iommu fault support
> >
> >   drivers/gpu/drm/msm/adreno/a5xx_gpu.c       |  23 +++-
> >   drivers/gpu/drm/msm/adreno/a6xx_gpu.c       | 110 +++++++++++++++++++-
> >   drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c |  42 ++++++--
> >   drivers/gpu/drm/msm/adreno/adreno_gpu.c     |  15 +++
> >   drivers/gpu/drm/msm/msm_gem.h               |   1 +
> >   drivers/gpu/drm/msm/msm_gem_submit.c        |   1 +
> >   drivers/gpu/drm/msm/msm_gpu.c               |  48 +++++++++
> >   drivers/gpu/drm/msm/msm_gpu.h               |  17 +++
> >   drivers/gpu/drm/msm/msm_gpummu.c            |   5 +
> >   drivers/gpu/drm/msm/msm_iommu.c             |  22 +++-
> >   drivers/gpu/drm/msm/msm_mmu.h               |   5 +-
> >   drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c  |  50 +++++++++
> >   drivers/iommu/arm/arm-smmu/arm-smmu.c       |   9 +-
> >   drivers/iommu/arm/arm-smmu/arm-smmu.h       |   2 +
> >   include/linux/adreno-smmu-priv.h            |  38 ++++++-
> >   15 files changed, 367 insertions(+), 21 deletions(-)
> >
>
>
> --
> With best wishes
> Dmitry