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@xxxxxxxxxx> > Sent: Monday, April 29, 2024 5:10 PM > To: will@xxxxxxxxxx; lpieralisi@xxxxxxxxxx; kw@xxxxxxxxx; robh@xxxxxxxxxx; > bhelgaas@xxxxxxxxxx; krzk+dt@xxxxxxxxxx; conor+dt@xxxxxxxxxx; > liviu.dudau@xxxxxxx; sudeep.holla@xxxxxxx; joro@xxxxxxxxxx > Cc: robin.murphy@xxxxxxx; Nicolin Chen <nicolinc@xxxxxxxxxx>; Ketan Patil > <ketanp@xxxxxxxxxx>; linux-pci@xxxxxxxxxxxxxxx; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx; iommu@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; > Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> > 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@xxxxxxxxxx/ > [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 >
