From: Bjorn Helgaas <helgaas@kernel.org>
To: Vidya Sagar <vidyas@nvidia.com>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>,
"will@kernel.org" <will@kernel.org>,
"lpieralisi@kernel.org" <lpieralisi@kernel.org>,
"kw@linux.com" <kw@linux.com>,
"robh@kernel.org" <robh@kernel.org>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"krzk+dt@kernel.org" <krzk+dt@kernel.org>,
"conor+dt@kernel.org" <conor+dt@kernel.org>,
"liviu.dudau@arm.com" <liviu.dudau@arm.com>,
"sudeep.holla@arm.com" <sudeep.holla@arm.com>,
"joro@8bytes.org" <joro@8bytes.org>,
"robin.murphy@arm.com" <robin.murphy@arm.com>,
Nicolin Chen <nicolinc@nvidia.com>,
Ketan Patil <ketanp@nvidia.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Subject: Re: [PATCH 0/3] Enable PCIe ATS for devicetree boot
Date: Wed, 15 May 2024 13:52:41 -0500 [thread overview]
Message-ID: <20240515185241.GA2131384@bhelgaas> (raw)
In-Reply-To: <PH8PR12MB6674391D5067B469B0400C26B8EC2@PH8PR12MB6674.namprd12.prod.outlook.com>
On Wed, May 15, 2024 at 06:28:15PM +0000, Vidya Sagar wrote:
> 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?
I probably marked it "handled elsewhere" in the PCI patchwork because
it doesn't touch PCI files (the binding has already been reviewed by
Rob and Liviu), so I assumed the iommu folks would take the series.
I don't know how they track patches.
The merge window is open now, so likely they would wait until the next
cycle so it would have some time in linux-next, but that's up to them.
> > -----Original Message-----
> > From: Jean-Philippe Brucker <jean-philippe@linaro.org>
> > Sent: Monday, April 29, 2024 5:10 PM
> > To: will@kernel.org; lpieralisi@kernel.org; kw@linux.com; robh@kernel.org;
> > bhelgaas@google.com; krzk+dt@kernel.org; conor+dt@kernel.org;
> > liviu.dudau@arm.com; sudeep.holla@arm.com; joro@8bytes.org
> > Cc: robin.murphy@arm.com; Nicolin Chen <nicolinc@nvidia.com>; Ketan Patil
> > <ketanp@nvidia.com>; linux-pci@vger.kernel.org; linux-arm-
> > kernel@lists.infradead.org; iommu@lists.linux.dev; devicetree@vger.kernel.org;
> > Jean-Philippe Brucker <jean-philippe@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@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
> >
>
next prev parent reply other threads:[~2024-05-15 18:52 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-29 11:39 [PATCH 0/3] Enable PCIe ATS for devicetree boot Jean-Philippe Brucker
2024-04-29 11:39 ` [PATCH 1/3] dt-bindings: PCI: generic: Add ats-supported property Jean-Philippe Brucker
2024-04-30 10:22 ` Liviu Dudau
2024-04-29 11:39 ` [PATCH 2/3] iommu/of: Support ats-supported device-tree property Jean-Philippe Brucker
2024-04-29 15:00 ` Jason Gunthorpe
2024-04-30 10:23 ` Liviu Dudau
2024-04-30 13:57 ` Robin Murphy
2024-05-02 4:55 ` Nicolin Chen
2024-04-29 11:39 ` [PATCH 3/3] arm64: dts: fvp: Enable PCIe ATS for Base RevC FVP Jean-Philippe Brucker
2024-05-16 10:44 ` Sudeep Holla
2024-05-15 18:28 ` [PATCH 0/3] Enable PCIe ATS for devicetree boot Vidya Sagar
2024-05-15 18:52 ` Bjorn Helgaas [this message]
2024-05-16 7:35 ` Jean-Philippe Brucker
2024-05-16 10:41 ` Sudeep Holla
2024-05-16 11:42 ` Jean-Philippe Brucker
2024-05-21 10:25 ` liviu.dudau
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