linux-kernel - Re: [PATCH 06/14] PCI: endpoint: Assign PCI domain number for endpoint controllers

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Message-ID: <5ea6d478-f2da-4b68-8987-79cc5dfb8c86@linaro.org>
Date: Mon, 15 Jul 2024 22:02:18 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: manivannan.sadhasivam@...aro.org,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kw@...ux.com>,
 Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 Bjorn Andersson <andersson@...nel.org>
Cc: linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 06/14] PCI: endpoint: Assign PCI domain number for
 endpoint controllers

On 15.07.2024 7:33 PM, Manivannan Sadhasivam via B4 Relay wrote:
> From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> Right now, PCI endpoint subsystem doesn't assign PCI domain number for the
> PCI endpoint controllers. But this domain number could be useful to the EPC
> drivers to uniquely identify each controller based on the hardware instance
> when there are multiple ones present in an SoC (even multiple RC/EP).
> 
> So let's make use of the existing pci_bus_find_domain_nr() API to allocate
> domain numbers based on either Devicetree (linux,pci-domain) property or
> dynamic domain number allocation scheme.
> 
> It should be noted that the domain number allocated by this API will be
> based on both RC and EP controllers in a SoC. If the 'linux,pci-domain' DT
> property is present, then the domain number represents the actual hardware
> instance of the PCI endpoint controller. If not, then the domain number
> will be allocated based on the PCI EP/RC controller probe order.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---

The PCI counterpart does some error checking and requires
CONFIG_PCI_DOMAINS_GENERIC. Is that something that needs to be taken
care of here as well?

Konrad