Re: [Devel] [PATCH v7 0/3] Cavium ThunderX2 SMMUv3 errata workarounds

[Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>]

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On Tue, May 30, 2017 at 05:33:38PM +0530, Geetha sowjanya wrote:
> 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

Yes so it is not standalone. How are we going to merge these
ACPI IORT/ACPICA/SMMU patches - inclusive of:

[1] https://www.spinics.net/lists/arm-kernel/msg586458.html

Rafael, do ACPICA patches go upstream via the ACPI tree pull request ?

To remove dependency on ACPICA changes this series needs updating
anyway and for [1] above I think the only solution is for all the
patches to go via the ACPI tree (if ACPICA updates go upstream with it).

Thanks,
Lorenzo

> 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      |    6 ++
>  drivers/acpi/arm64/iort.c                          |   10 ++-
>  drivers/iommu/arm-smmu-v3.c                        |   93 ++++++++++++++++----
>  4 files changed, 91 insertions(+), 20 deletions(-)
>