[v5,00/25] iommu: Shared Virtual Addressing and SMMUv3 support

Message

Jean-Philippe Brucker April 14, 2020, 5:02 p.m. UTC

Shared Virtual Addressing (SVA) allows to share process page tables with
devices using the IOMMU. Add a generic implementation of the IOMMU SVA
API, and add support in the Arm SMMUv3 driver.

Since v4 [1] I changed the PASID lifetime. It isn't released when the
corresponding process address space dies, but when the device driver calls
unbind. This alleviates the mmput() path as we don't need to ensure that
the device driver stops DMA there anymore. For more details see my
proposal from last week [2], which is a requirement for this series. As a
result patch 1 has separate clear() and detach() operations, and patch 17
has a new context descriptor state. 

Other changes are a simplification of the locking in patch 1 and overall
cleanups following review comments.

[1] [PATCH v4 00/26] iommu: Shared Virtual Addressing and SMMUv3 support
    https://lore.kernel.org/linux-iommu/[e-mail]/
[2] [PATCH 0/2] iommu: Remove iommu_sva_ops::mm_exit()
    https://lore.kernel.org/linux-iommu/[e-mail]/

Jean-Philippe Brucker (25):
  mm/mmu_notifiers: pass private data down to alloc_notifier()
  iommu/sva: Manage process address spaces
  iommu: Add a page fault handler
  iommu/sva: Search mm by PASID
  iommu/iopf: Handle mm faults
  iommu/sva: Register 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: Implement mm operations
  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                         |   13 +
 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                     |   78 +
 include/linux/iommu.h                         |   75 +
 include/linux/mmu_notifier.h                  |   11 +-
 include/linux/pci-ats.h                       |    8 +
 arch/arm64/kernel/cpufeature.c                |    1 +
 arch/arm64/mm/context.c                       |  103 +-
 drivers/iommu/arm-smmu-v3.c                   | 1398 +++++++++++++++--
 drivers/iommu/io-pgfault.c                    |  525 +++++++
 drivers/iommu/io-pgtable-arm.c                |   27 +-
 drivers/iommu/iommu-sva.c                     |  557 +++++++
 drivers/iommu/iommu.c                         |    1 +
 drivers/iommu/of_iommu.c                      |    5 +-
 drivers/misc/sgi-gru/grutlbpurge.c            |    5 +-
 drivers/pci/ats.c                             |    4 +
 mm/mmu_notifier.c                             |    6 +-
 21 files changed, 2716 insertions(+), 163 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