linux-kernel - [PATCH v4 00/12] iommu: SVA and IOPF refactoring

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Date:   Thu, 21 Apr 2022 13:21:09 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
Cc:     Eric Auger <eric.auger@...hat.com>, Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v4 00/12] iommu: SVA and IOPF refactoring

Hi folks,

The former part of this series refactors the IOMMU SVA code by assigning
an SVA type of iommu_domain to a shared virtual address and replacing
sva_bind/unbind iommu ops with attach/detach_dev_pasid domain ops.

The latter part changes the existing I/O page fault handling framework
from only serving SVA to a generic one. Any driver or component could
handle the I/O page faults for its domain in its own way by installing
an I/O page fault handler.

This series has been functionally tested on an x86 machine and compile
tested for other architectures. 

This series is also available on github:
[2] https://github.com/LuBaolu/intel-iommu/commits/iommu-sva-refactoring-v4

Please review and suggest.

Best regards,
baolu

Change log:
v4:
 - Solve the overlap with another series and make this series
   self-contained.
 - No objection to the abstraction of data structure during v3 review.
   Hence remove the RFC subject prefix.
 - Refine the immutable singleton group code according to Kevin's
   comments.

v3:
 - https://lore.kernel.org/linux-iommu/20220410102443.294128-1-baolu.lu@linux.intel.com/
 - Rework iommu_group_singleton_lockdown() by adding a flag to the group
   that positively indicates the group can never have more than one
   member, even after hot plug.
 - Abstract the data structs used for iommu sva in a separated patches to
   make it easier for review.
 - I still keep the RFC prefix in this series as above two significant
   changes need at least another round review to be finalized.
 - Several misc refinements.

v2:
 - https://lore.kernel.org/linux-iommu/20220329053800.3049561-1-baolu.lu@linux.intel.com/
 - Add sva domain life cycle management to avoid race between unbind and
   page fault handling.
 - Use a single domain for each mm.
 - Return a single sva handler for the same binding.
 - Add a new helper to meet singleton group requirement.
 - Rework the SVA domain allocation for arm smmu v3 driver and move the
   pasid_bit initialization to device probe.
 - Drop the patch "iommu: Handle IO page faults directly".
 - Add mmget_not_zero(mm) in SVA page fault handler.

v1:
 - https://lore.kernel.org/linux-iommu/20220320064030.2936936-1-baolu.lu@linux.intel.com/
 - Initial post.

Dave Jiang (1):
  dmaengine: idxd: Separate user and kernel pasid enabling

Lu Baolu (11):
  iommu: Add pasid_bits field in struct dev_iommu
  iommu: Add attach/detach_dev_pasid domain ops
  iommu/sva: Basic data structures for SVA
  iommu/vt-d: Remove SVM_FLAG_SUPERVISOR_MODE support
  iommu/vt-d: Add SVA domain support
  arm-smmu-v3/sva: Add SVA domain support
  iommu/sva: Use attach/detach_pasid_dev in SVA interfaces
  iommu: Remove SVA related callbacks from iommu ops
  iommu: Prepare IOMMU domain for IOPF
  iommu: Per-domain I/O page fault handling
  iommu: Rename iommu-sva-lib.{c,h}

 include/linux/intel-iommu.h                   |   5 +-
 include/linux/iommu.h                         | 106 ++++--
 drivers/dma/idxd/idxd.h                       |   6 +
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  25 +-
 .../iommu/{iommu-sva-lib.h => iommu-sva.h}    |   8 +-
 drivers/dma/idxd/cdev.c                       |   4 +-
 drivers/dma/idxd/init.c                       |  30 +-
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   |  85 ++---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   |  28 +-
 drivers/iommu/intel/iommu.c                   |  20 +-
 drivers/iommu/intel/svm.c                     | 135 +++----
 drivers/iommu/io-pgfault.c                    |  71 +---
 drivers/iommu/iommu-sva-lib.c                 |  71 ----
 drivers/iommu/iommu-sva.c                     | 331 ++++++++++++++++++
 drivers/iommu/iommu.c                         | 219 +++++++-----
 drivers/iommu/Makefile                        |   2 +-
 16 files changed, 721 insertions(+), 425 deletions(-)
 rename drivers/iommu/{iommu-sva-lib.h => iommu-sva.h} (88%)
 delete mode 100644 drivers/iommu/iommu-sva-lib.c
 create mode 100644 drivers/iommu/iommu-sva.c

-- 
2.25.1