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

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Date:   Thu, 10 Jun 2021 14:44:08 -0700
From:   Rob Clark <robdclark@...il.com>
To:     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>,
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM SMMU DRIVERS),
        linux-kernel@...r.kernel.org (open list),
        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: [PATCH v5 0/5] iommu/arm-smmu: adreno-smmu page fault handling

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(-)

-- 
2.31.1