From: Jean-Philippe Brucker <jean-philippe@linaro.org>
To: bhelgaas@google.com, will@kernel.org, robh+dt@kernel.org,
joro@8bytes.org, baolu.lu@linux.intel.com, sudeep.holla@arm.com,
linux-doc@vger.kernel.org, linux-pci@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org
Cc: lorenzo.pieralisi@arm.com, corbet@lwn.net, mark.rutland@arm.com,
liviu.dudau@arm.com, guohanjun@huawei.com, rjw@rjwysocki.net,
lenb@kernel.org, robin.murphy@arm.com, dwmw2@infradead.org,
amurray@thegoodpenguin.co.uk, frowand.list@gmail.com,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Rob Herring <robh@kernel.org>
Subject: [PATCH v2 01/11] dt-bindings: PCI: generic: Add ats-supported property
Date: Wed, 11 Mar 2020 13:44:56 +0100 [thread overview]
Message-ID: <20200311124506.208376-2-jean-philippe@linaro.org> (raw)
In-Reply-To: <20200311124506.208376-1-jean-philippe@linaro.org>
Add a way for firmware to tell the OS that ATS is supported by the PCI
root complex. An endpoint with ATS enabled may send Translation Requests
and Translated Memory Requests, which look just like Normal Memory
Requests with a non-zero AT field. So a root controller that ignores the
AT field may simply forward the request to the IOMMU as a Normal Memory
Request, which could end badly. In any case, the endpoint will be
unusable.
The ats-supported property allows the OS to only enable ATS in endpoints
if the root controller can handle ATS requests. Only add the property to
pcie-host-ecam-generic for the moment. For non-generic root controllers,
availability of ATS can be inferred from the compatible string.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
Documentation/devicetree/bindings/pci/host-generic-pci.yaml | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.yaml b/Documentation/devicetree/bindings/pci/host-generic-pci.yaml
index 47353d0cd394..7d40edd7f1ef 100644
--- a/Documentation/devicetree/bindings/pci/host-generic-pci.yaml
+++ b/Documentation/devicetree/bindings/pci/host-generic-pci.yaml
@@ -107,6 +107,12 @@ properties:
dma-coherent: true
+ ats-supported:
+ description:
+ Indicates that a PCIe host controller supports ATS, and can handle Memory
+ Requests with Address Type (AT).
+ type: boolean
+
required:
- compatible
- reg
--
2.25.1
next prev parent reply other threads:[~2020-03-11 12:47 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 12:44 [PATCH v2 00/11] PCI/ATS: Device-tree support and other improvements Jean-Philippe Brucker
2020-03-11 12:44 ` Jean-Philippe Brucker [this message]
2020-03-11 12:44 ` [PATCH v2 02/11] PCI: Add ats_supported host bridge flag Jean-Philippe Brucker
2020-03-12 21:21 ` Bjorn Helgaas
2020-03-11 12:44 ` [PATCH v2 03/11] PCI: OF: Check whether the host bridge supports ATS Jean-Philippe Brucker
2020-03-12 20:45 ` Bjorn Helgaas
2020-03-11 12:44 ` [PATCH v2 04/11] ACPI/IORT: Check ATS capability in root complex node Jean-Philippe Brucker
2020-03-12 20:58 ` Bjorn Helgaas
2020-03-11 12:45 ` [PATCH v2 05/11] PCI/ATS: Gather checks into pci_ats_supported() Jean-Philippe Brucker
2020-03-12 21:01 ` Bjorn Helgaas
2020-03-11 12:45 ` [PATCH v2 06/11] iommu/amd: Use pci_ats_supported() Jean-Philippe Brucker
2020-03-11 12:45 ` [PATCH v2 07/11] iommu/arm-smmu-v3: " Jean-Philippe Brucker
2020-03-18 21:49 ` Will Deacon
2020-03-11 12:45 ` [PATCH v2 08/11] iommu/vt-d: " Jean-Philippe Brucker
2020-03-12 1:44 ` Lu Baolu
2020-03-12 7:54 ` Jean-Philippe Brucker
2020-03-12 8:18 ` Lu Baolu
2020-03-11 12:45 ` [PATCH v2 09/11] ACPI/IORT: Drop ATS fwspec flag Jean-Philippe Brucker
2020-03-11 12:45 ` [PATCH v2 10/11] arm64: dts: fast models: Enable PCIe ATS for Base RevC FVP Jean-Philippe Brucker
2020-03-11 12:45 ` [PATCH v2 11/11] Documentation: Generalize the "pci=noats" boot parameter Jean-Philippe Brucker
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