Add stall support to the SMMUv3, along with a common I/O Page Fault
handler.

Changes since v9 [1]:
* Style changes suggested by Jonathan
* Fixes to patch 10 pointed out by Robin
* In patch 10, don't register the mm fault handler when enabling
  IOMMU_DEV_FEAT_IOPF, because that feature only indicates that a device
  driver wants to use PRI or stall. After enabling it, drivers may
  register their own IOPF handler (see discussion on v9 patch 03).
  Instead register the mm handler when enabling IOMMU_DEV_FEAT_SVA.

[1] https://lore.kernel.org/linux-iommu/20210108145217.2254447-1-jean-philippe@linaro.org/ (local)

Jean-Philippe Brucker (10):
  iommu: Fix comment for struct iommu_fwspec
  iommu/arm-smmu-v3: Use device properties for pasid-num-bits
  iommu: Separate IOMMU_DEV_FEAT_IOPF from IOMMU_DEV_FEAT_SVA
  iommu/vt-d: Support IOMMU_DEV_FEAT_IOPF
  uacce: Enable IOMMU_DEV_FEAT_IOPF
  iommu: Add a page fault handler
  iommu/arm-smmu-v3: Maintain a SID->device structure
  dt-bindings: document stall property for IOMMU masters
  ACPI/IORT: Enable stall support for platform devices
  iommu/arm-smmu-v3: Add stall support for platform devices

 drivers/iommu/Makefile                        |   1 +
 .../devicetree/bindings/iommu/iommu.txt       |  18 +
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  56 ++-
 drivers/iommu/iommu-sva-lib.h                 |  53 ++
 include/linux/iommu.h                         |  26 +-
 drivers/acpi/arm64/iort.c                     |  15 +-
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   |  59 ++-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 347 +++++++++++--
 drivers/iommu/intel/iommu.c                   |  11 +-
 drivers/iommu/io-pgfault.c                    | 461 ++++++++++++++++++
 drivers/iommu/of_iommu.c                      |   5 -
 drivers/misc/uacce/uacce.c                    |  39 +-
 12 files changed, 1018 insertions(+), 73 deletions(-)
 create mode 100644 drivers/iommu/io-pgfault.c

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2.30.0