[PATCH v13 00/10] iommu: I/O page faults for SMMUv3

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

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

Since v12 [1]:
* Fixed failure path of arm_smmu_insert_master(), in patch 07 (Keqian
  Zhu)
* In arm_smmu_handle_evt(), patch 10, don't report IPA field on stage-1
  faults, and report accurate fault reason (Eric Auger)
* Fix possible use-after-free in arm_smmu_handle_evt(), patch 10: if a
  master is removed while we handle its events, we could in theory
  dereference a freed master struct. Hold streams_mutex while using a
  master struct obtained with arm_smmu_find_master().


Future work regarding IOPF:
* Keep stall disabled by default, only enable it per CD when drivers
  request it [2][3].
* Add PRI support to SMMUv3.
* Route all recoverable faults through io-pgfault.c, so we can track
  partial faults better [4].
* Nested IOPF [5].

[1] https://lore.kernel.org/linux-iommu/20210127154322.3959196-1-jean-philippe@linaro.org/
[2] https://lore.kernel.org/linux-iommu/22fa4120-eadf-20d5-0d0a-9935aa0f1fb5@hisilicon.com/
[3] https://lore.kernel.org/linux-iommu/YAhui7UOw7743shI@myrica/
[4] https://lore.kernel.org/kvm/YB0f5Yno9frihQq4@myrica/
[5] https://lore.kernel.org/linux-acpi/MWHPR11MB188653AF6EFA0E55DE17815F8CA40@MWHPR11MB1886.namprd11.prod.outlook.com/

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   | 354 ++++++++++++--
 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, 1024 insertions(+), 74 deletions(-)
 create mode 100644 drivers/iommu/io-pgfault.c

-- 
2.30.1