[PATCH v7 00/10] iommu: SVA and IOPF refactoring

[Lu Baolu <baolu.lu@linux.intel.com>]

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-v7

Please review and suggest.

Best regards,
baolu

Change log:
v7:
 - Remove duplicate array for sva domain.
 - Rename detach_dev_pasid to block_dev_pasid.
 - Add raw device driver interfaces for iommufd.
 - Other misc refinements and patch reorganization.
 - Drop "dmaengine: idxd: Separate user and kernel pasid enabling" which
   has been picked for dmaengine tree.

v6:
 - https://lore.kernel.org/linux-iommu/20220510061738.2761430-1-baolu.lu@linux.intel.com/
 - Refine the SVA basic data structures.
   Link: https://lore.kernel.org/linux-iommu/YnFv0ps0Ad8v+7uH@myrica/
 - Refine arm smmuv3 sva domain allocation.
 - Fix a possible lock issue.
   Link: https://lore.kernel.org/linux-iommu/YnFydE8j8l7Q4m+b@myrica/

v5:
 - https://lore.kernel.org/linux-iommu/20220502014842.991097-1-baolu.lu@linux.intel.com/
 - Address review comments from Jean-Philippe Brucker. Very appreciated!
 - Remove redundant pci aliases check in
   device_group_immutable_singleton().
 - Treat all buses exept PCI as static in immutable singleton check.
 - As the sva_bind/unbind() have already guaranteed sva domain free only
   after iopf_queue_flush_dev(), remove the unnecessary domain refcount.
 - Move domain get() out of the list iteration in iopf_handle_group().

v4:
 - https://lore.kernel.org/linux-iommu/20220421052121.3464100-1-baolu.lu@linux.intel.com/
 - 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.

Lu Baolu (10):
  iommu: Add pasids field in struct iommu_device
  iommu: Remove SVM_FLAG_SUPERVISOR_MODE support
  iommu/sva: Add iommu_sva_domain support
  iommu/vt-d: Add SVA domain support
  arm-smmu-v3/sva: Add SVA domain support
  iommu/sva: Refactoring iommu_sva_bind/unbind_device()
  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                   |   8 +-
 include/linux/intel-svm.h                     |  13 -
 include/linux/iommu.h                         | 113 +++++--
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  21 +-
 .../iommu/{iommu-sva-lib.h => iommu-sva.h}    |  16 +
 drivers/dma/idxd/cdev.c                       |   2 +-
 drivers/dma/idxd/init.c                       |  24 +-
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   |  89 +++---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   |  12 +-
 drivers/iommu/intel/dmar.c                    |   4 +
 drivers/iommu/intel/iommu.c                   |   9 +-
 drivers/iommu/intel/svm.c                     | 135 +++-----
 drivers/iommu/io-pgfault.c                    |  73 +----
 drivers/iommu/iommu-sva-lib.c                 |  71 -----
 drivers/iommu/iommu-sva.c                     | 297 ++++++++++++++++++
 drivers/iommu/iommu.c                         | 191 +++++------
 drivers/misc/uacce/uacce.c                    |   2 +-
 drivers/iommu/Makefile                        |   2 +-
 18 files changed, 629 insertions(+), 453 deletions(-)
 rename drivers/iommu/{iommu-sva-lib.h => iommu-sva.h} (80%)
 delete mode 100644 drivers/iommu/iommu-sva-lib.c
 create mode 100644 drivers/iommu/iommu-sva.c

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2.25.1