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

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Message-ID: <2016473f-2b38-f049-1e8d-04bdf5af6cea@linaro.org>
Date:   Sun, 4 Jul 2021 15:53:38 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org,
        iommu@...ts.linux-foundation.org
Cc:     freedreno@...ts.freedesktop.org, 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

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

View attachment "log-rb3-crash.txt" of type "text/plain" (29485 bytes)