[PATCH v7 00/24] iommu: Shared Virtual Addressing for SMMUv3

[Jean-Philippe Brucker <jean-philippe@linaro.org>]

Shared Virtual Addressing (SVA) allows to share process page tables with
devices using the IOMMU, PASIDs and I/O page faults. Add SVA support to
the Arm SMMUv3 driver.

Since v6 [1]:
* Rename ioasid_free() to ioasid_put() in patch 02, requiring changes to
  the Intel drivers.
* Use mmu_notifier_register() in patch 16 to avoid copying the ops and
  simplify the invalidate() notifier in patch 17.
* As a result, replace context spinlock with a mutex. Simplified locking in
  patch 11 (That patch still looks awful, but I think the series is more
  readable overall). And I've finally been able to remove the GFP_ATOMIC
  allocations.
* Use a single patch (04) for io-pgfault.c, since the code was simplified
  in v6. Fixed partial list in patch 04.

[1] https://lore.kernel.org/linux-iommu/20200430143424.2787566-1-jean-philippe@linaro.org/

Jean-Philippe Brucker (24):
  mm: Add a PASID field to mm_struct
  iommu/ioasid: Add ioasid references
  iommu/sva: Add PASID helpers
  iommu: Add a page fault handler
  arm64: mm: Add asid_gen_match() helper
  arm64: mm: Pin down ASIDs for sharing mm with devices
  iommu/io-pgtable-arm: Move some definitions to a header
  iommu/arm-smmu-v3: Manage ASIDs with xarray
  arm64: cpufeature: Export symbol read_sanitised_ftr_reg()
  iommu/arm-smmu-v3: Share process page tables
  iommu/arm-smmu-v3: Seize private ASID
  iommu/arm-smmu-v3: Add support for VHE
  iommu/arm-smmu-v3: Enable broadcast TLB maintenance
  iommu/arm-smmu-v3: Add SVA feature checking
  iommu/arm-smmu-v3: Add SVA device feature
  iommu/arm-smmu-v3: Implement iommu_sva_bind/unbind()
  iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops
  iommu/arm-smmu-v3: Add support for Hardware Translation Table Update
  iommu/arm-smmu-v3: Maintain a SID->device structure
  dt-bindings: document stall property for IOMMU masters
  iommu/arm-smmu-v3: Add stall support for platform devices
  PCI/ATS: Add PRI stubs
  PCI/ATS: Export PRI functions
  iommu/arm-smmu-v3: Add support for PRI

 drivers/iommu/Kconfig                         |   12 +
 drivers/iommu/Makefile                        |    2 +
 .../devicetree/bindings/iommu/iommu.txt       |   18 +
 arch/arm64/include/asm/mmu.h                  |    1 +
 arch/arm64/include/asm/mmu_context.h          |   11 +-
 drivers/iommu/io-pgtable-arm.h                |   30 +
 drivers/iommu/iommu-sva.h                     |   15 +
 include/linux/ioasid.h                        |   10 +-
 include/linux/iommu.h                         |   53 +
 include/linux/mm_types.h                      |    4 +
 include/linux/pci-ats.h                       |    8 +
 arch/arm64/kernel/cpufeature.c                |    1 +
 arch/arm64/mm/context.c                       |  103 +-
 drivers/iommu/arm-smmu-v3.c                   | 1552 +++++++++++++++--
 drivers/iommu/intel-iommu.c                   |    4 +-
 drivers/iommu/intel-svm.c                     |    6 +-
 drivers/iommu/io-pgfault.c                    |  459 +++++
 drivers/iommu/io-pgtable-arm.c                |   27 +-
 drivers/iommu/ioasid.c                        |   38 +-
 drivers/iommu/iommu-sva.c                     |   85 +
 drivers/iommu/of_iommu.c                      |    5 +-
 drivers/pci/ats.c                             |    4 +
 MAINTAINERS                                   |    3 +-
 23 files changed, 2286 insertions(+), 165 deletions(-)
 create mode 100644 drivers/iommu/io-pgtable-arm.h
 create mode 100644 drivers/iommu/iommu-sva.h
 create mode 100644 drivers/iommu/io-pgfault.c
 create mode 100644 drivers/iommu/iommu-sva.c

-- 
2.26.2

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