linux-kernel - [PATCH v3 0/3] iommu/arm-smmu: adreno-smmu page fault handling

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Date:   Thu, 25 Feb 2021 10:51:32 -0700
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     linux-arm-msm@...r.kernel.org
Cc:     Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, Will Deacon <will@...nel.org>,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>, Eric Anholt <eric@...olt.net>,
        Joerg Roedel <joro@...tes.org>,
        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>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Sean Paul <sean@...rly.run>,
        Sharat Masetty <smasetty@...eaurora.org>,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/3] iommu/arm-smmu: adreno-smmu page fault handling

(resending for the 5.13 cycle)

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.

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

Jordan Crouse (3):
  iommu/arm-smmu: Add support for driver IOMMU fault handlers
  drm/msm: Add an adreno-smmu-priv callback to get pagefault info
  drm/msm: Improve the a6xx page fault handler

 drivers/gpu/drm/msm/adreno/a5xx_gpu.c      |  4 +-
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c      | 76 +++++++++++++++++++++-
 drivers/gpu/drm/msm/msm_iommu.c            | 11 +++-
 drivers/gpu/drm/msm/msm_mmu.h              |  4 +-
 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 19 ++++++
 drivers/iommu/arm/arm-smmu/arm-smmu.c      |  9 ++-
 drivers/iommu/arm/arm-smmu/arm-smmu.h      |  2 +
 include/linux/adreno-smmu-priv.h           | 31 ++++++++-
 8 files changed, 145 insertions(+), 11 deletions(-)

-- 
2.25.1