linux-kernel - [PATCH v11 0/4] io-pgtable-arm + drm/msm: Extend iova fault debugging

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Message-ID: <20241210165127.600817-1-robdclark@gmail.com>
Date: Tue, 10 Dec 2024 08:51:18 -0800
From: Rob Clark <robdclark@...il.com>
To: iommu@...ts.linux.dev
Cc: linux-arm-msm@...r.kernel.org,
	freedreno@...ts.freedesktop.org,
	Mostafa Saleh <smostafa@...gle.com>,
	Will Deacon <will@...nel.org>,
	Rob Clark <robdclark@...omium.org>,
	dri-devel@...ts.freedesktop.org (open list:DRM DRIVER for Qualcomm Adreno GPUs),
	Jason Gunthorpe <jgg@...pe.ca>,
	Joao Martins <joao.m.martins@...cle.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Konrad Dybcio <konradybcio@...nel.org>,
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM SMMU DRIVERS),
	linux-kernel@...r.kernel.org (open list),
	linux-pm@...r.kernel.org (open list:SUSPEND TO RAM),
	Marijn Suijten <marijn.suijten@...ainline.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Ryan Roberts <ryan.roberts@....com>,
	Sean Paul <sean@...rly.run>
Subject: [PATCH v11 0/4] io-pgtable-arm + drm/msm: Extend iova fault debugging

From: Rob Clark <robdclark@...omium.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
v11: Adjust logic in 3/4 [smostafa@]

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          | 157 +++++++++++++++---------
 include/linux/io-pgtable.h              |  15 +++
 7 files changed, 167 insertions(+), 57 deletions(-)

-- 
2.47.1