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

From: Konrad Dybcio
Date: Mon Jul 15 2024 - 16:02:31 EST


On 15.07.2024 7:33 PM, Manivannan Sadhasivam via B4 Relay wrote:
> From: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
> ---

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