[PATCH 0/3] Enable PCIe ATS for devicetree boot

[Vidya Sagar]

Thanks, Jean for this series.
May I know the current status of it?
Although it was actively reviewed, I see that its current status is set to 
'Handled Elsewhere' in https://patchwork.kernel.org/project/linux-pci/list/?series=848836&state=*
What is the plan to get this series accepted?

Thanks,
Vidya Sagar

> -----Original Message-----
> From: Jean-Philippe Brucker <jean-philippe at linaro.org>
> Sent: Monday, April 29, 2024 5:10 PM
> To: will at kernel.org; lpieralisi at kernel.org; kw at linux.com; robh at kernel.org;
> bhelgaas at google.com; krzk+dt at kernel.org; conor+dt at kernel.org;
> liviu.dudau at arm.com; sudeep.holla at arm.com; joro at 8bytes.org
> Cc: robin.murphy at arm.com; Nicolin Chen <nicolinc at nvidia.com>; Ketan Patil
> <ketanp at nvidia.com>; linux-pci at vger.kernel.org; linux-arm-
> kernel at lists.infradead.org; iommu at lists.linux.dev; devicetree at vger.kernel.org;
> Jean-Philippe Brucker <jean-philippe at linaro.org>
> Subject: [PATCH 0/3] Enable PCIe ATS for devicetree boot
> 
> External email: Use caution opening links or attachments
> 
> 
> Before enabling Address Translation Support (ATS) in endpoints, the OS needs to
> confirm that the Root Complex supports it. Obtain this information from the
> firmware description since there is no architected method. ACPI provides a bit via
> IORT tables, so add the devicetree equivalent.
> 
> It was discussed a while ago [1], but at the time only a software model supported
> it. Respin it now that hardware is available [2].
> 
> To test this with the Arm RevC model, enable ATS in the endpoint and note that
> ATS is enabled. Address translation is transparent to the OS.
> 
>         -C pci.pcie_rc.ahci0.endpoint.ats_supported=1
> 
>     $ lspci -s 00:1f.0 -vv
>         Capabilities: [100 v1] Address Translation Service (ATS)
>                 ATSCap: Invalidate Queue Depth: 00
>                 ATSCtl: Enable+, Smallest Translation Unit: 00
> 
> 
> [1] https://lore.kernel.org/linux-iommu/20200213165049.508908-1-jean-
> philippe at linaro.org/
> [2] https://lore.kernel.org/linux-arm-kernel/ZeJP6CwrZ2FSbTYm@Asurada-
> Nvidia/
> 
> Jean-Philippe Brucker (3):
>   dt-bindings: PCI: generic: Add ats-supported property
>   iommu/of: Support ats-supported device-tree property
>   arm64: dts: fvp: Enable PCIe ATS for Base RevC FVP
> 
>  .../devicetree/bindings/pci/host-generic-pci.yaml        | 6 ++++++
>  drivers/iommu/of_iommu.c                                 | 9 +++++++++
>  arch/arm64/boot/dts/arm/fvp-base-revc.dts                | 1 +
>  3 files changed, 16 insertions(+)
> 
> --
> 2.44.0
>