[PATCH v9 0/3] Cavium ThunderX2 SMMUv3 errata workarounds

[Geetha sowjanya]

Cavium ThunderX2 SMMUv3 implementation has two Silicon Erratas.
1. Errata ID #74
   SMMU register alias Page 1 is not implemented
2. Errata ID #126
   SMMU doesnt support unique IRQ lines and also MSI for gerror,
   eventq and cmdq-sync

The following patchset does software workaround for these two erratas.

This series is based on patchset.
https://www.spinics.net/lists/arm-kernel/msg578443.html

Changes since v8:
    - Reworked patch #3 as suggested by Will. 
    - Corrected typo mistake in patch #2

Changes since v7:
    - Added new function "arm_smmu_v3_resource_size" in iort.c to get resource
      size.
    - Added new SMMU option "SHARED_IRQ" to enable errata #126 workaround.
    - Coding style issues fixed.
    - Suggested changes in arm_smmu_device_probe addressed.
    - Replaced ACPI_IORT_SMMU_CAVIUM_CN99XX macro with ACPI_IORT_SMMU_V3_CAVIUM_CN99XX

Changes since v6:
   - Changed device tree compatible string to vendor specific.
   - Rebased on Robin's latest "Update SMMU models for IORT rev. C" v2 patch.
     https://www.spinics.net/lists/arm-kernel/msg582809.html

Changes since v5:
   - Rebased on Robin's "Update SMMU models for IORT rev. C" patch.
     https://www.spinics.net/lists/arm-kernel/msg580728.html
   - Replaced ACPI_IORT_SMMU_V3_CAVIUM_CN99XX macro with ACPI_IORT_SMMU_CAVIUM_CN99XX

Changes since v4:
  - Replaced all page1 offset macros ARM_SMMU_EVTQ/PRIQ_PROD/CONS with
    arm_smmu_page1_fixup(ARM_SMMU_EVTQ/PRIQ_PROD/CONS, smmu)

Changes since v3:
  - Merged patches 1, 2 and 4 of Version 3.
  - Modified the page1_offset_adjust() and get_irq_flags() implementation as
    suggested by Robin.

Changes since v2:
  - Updated "Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt" document with
    new SMMU option used to enable errata workaround.

Changes since v1:
 - Since the use of MIDR register is rejected and SMMU_IIDR is broken on this
   silicon, as suggested by Will Deacon modified the patches to use ThunderX2
   SMMUv3 IORT model number to enable errata workaround.

Geetha Sowjanya (1):
  iommu/arm-smmu-v3: Add workaround for Cavium ThunderX2 erratum #126

Linu Cherian (2):
  ACPI/IORT: Fixup SMMUv3 resource size for Cavium ThunderX2 SMMUv3
    model
  iommu/arm-smmu-v3: Add workaround for Cavium ThunderX2 erratum #74

 Documentation/arm64/silicon-errata.txt             |    2 +
 .../devicetree/bindings/iommu/arm,smmu-v3.txt      |    7 +
 drivers/acpi/arm64/iort.c                          |   69 ++++++---
 drivers/iommu/arm-smmu-v3.c                        |  171 +++++++++++++++-----
 4 files changed, 186 insertions(+), 63 deletions(-)