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[v10,0/4] io-pgtable-arm + drm/msm: Extend iova fault debugging

Message ID 20241028213146.238941-1-robdclark@gmail.com
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Series io-pgtable-arm + drm/msm: Extend iova fault debugging | expand

Message

Rob Clark Oct. 28, 2024, 9:31 p.m. UTC 
From: Rob Clark <robdclark@chromium.org>

This series extends io-pgtable-arm with a method to retrieve the page
table entries traversed in the process of address translation, and then
beefs up drm/msm gpu devcore dump to include this (and additional info)
in the devcore dump.

This is a respin of https://patchwork.freedesktop.org/series/94968/
(minus a patch that was already merged)

v2:  Fix an armv7/32b build error in the last patch
v3:  Incorperate Will Deacon's suggestion to make the interface
     callback based.
v4:  Actually wire up the callback
v5:  Drop the callback approach
v6:  Make walk-data struct pgtable specific and rename
     io_pgtable_walk_data to arm_lpae_io_pgtable_walk_data
v7:  Re-use the pgtable walker added for arm_lpae_read_and_clear_dirty()
v8:  Pass pte pointer to callback so it can modify the actual pte
v9:  Fix selftests_running case
v10: Call visit cb for all nodes traversed, leave the decision about
     whether to care about non-leaf nodes to the callback

Rob Clark (4):
  iommu/io-pgtable-arm: Make pgtable walker more generic
  iommu/io-pgtable-arm: Re-use the pgtable walk for iova_to_phys
  iommu/io-pgtable-arm: Add way to debug pgtable walk
  drm/msm: Extend gpu devcore dumps with pgtbl info

 drivers/gpu/drm/msm/adreno/adreno_gpu.c |  10 ++
 drivers/gpu/drm/msm/msm_gpu.c           |   9 ++
 drivers/gpu/drm/msm/msm_gpu.h           |   8 ++
 drivers/gpu/drm/msm/msm_iommu.c         |  22 ++++
 drivers/gpu/drm/msm/msm_mmu.h           |   3 +-
 drivers/iommu/io-pgtable-arm.c          | 156 +++++++++++++++---------
 include/linux/io-pgtable.h              |  15 +++
 7 files changed, 166 insertions(+), 57 deletions(-)