linux-kernel - Re: [PATCH v18 04/15] dt-bindings: PCI: pci-ep: Add support for iommu-map and msi-map

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Message-ID: <174475967369.1016540.6220438967935307132.robh@kernel.org>
Date: Tue, 15 Apr 2025 18:27:54 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Frank Li <Frank.Li@....com>
Cc: Conor Dooley <conor+dt@...nel.org>, Shuah Khan <shuah@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, linux-pci@...r.kernel.org,
	Marc Zyngier <maz@...nel.org>, imx@...ts.linux.dev,
	Thomas Gleixner <tglx@...utronix.de>, devicetree@...r.kernel.org,
	Anup Patel <apatel@...tanamicro.com>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Lucas Stach <l.stach@...gutronix.de>,
	Danilo Krummrich <dakr@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>, dlemoal@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	Richard Zhu <hongxing.zhu@....com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
	Fabio Estevam <festevam@...il.com>, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Niklas Cassel <cassel@...nel.org>, jdmason@...zu.us,
	Shawn Guo <shawnguo@...nel.org>, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v18 04/15] dt-bindings: PCI: pci-ep: Add support for
 iommu-map and msi-map


On Mon, 14 Apr 2025 14:30:58 -0400, Frank Li wrote:
> Document the use of (msi|iommu)-map for PCI Endpoint (EP) controllers,
> which can use MSI as a doorbell mechanism. Each EP controller can support
> up to 8 physical functions and 65,536 virtual functions.
> 
> Define how to construct device IDs using function bits [2:0] and virtual
> function index bits [31:3], enabling (msi|iommu)-map to associate each
> child device with a specific (msi|iommu)-specifier.
> 
> The EP cannot rely on PCI Requester ID (RID) because the RID is determined
> by the PCI topology of the host system. Since the EP may be connected to
> different PCI hosts, the RID can vary between systems and is therefore not
> a reliable identifier.
> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> Change from v17 to v18
> - mask max value should 0x7ffff
> - order according to property name
> 
> Change from v16 to v17
> - new patch
> ---
>  Documentation/devicetree/bindings/pci/pci-ep.yaml | 68 +++++++++++++++++++++++
>  1 file changed, 68 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>