Re: [RFC PATCH 0/2] arm: pcibios: remove pci_sys_data domain

[Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>]

On Thu, Oct 30, 2014 at 05:45:41PM +0000, Jason Gunthorpe wrote:
> On Thu, Oct 30, 2014 at 05:39:15PM +0000, Liviu Dudau wrote:
> 
> > But of_pci_get_host_bridge_resources() does not request the resources, it only
> > creates them out of the DT ranges. If/when the driver decides the list of
> > resources is correct and it can work with it can also request them and use
> > whatever domain number allocation strategy it wants (auto-incrementing or DT
> > based). So I don't think the global sequencing is broken here.
> 
> So how does mvebu now allocate a unique domain number per mvebu_pcie?
> 
> Which hw_pci callback should do that?

It is done through core code in pci_create_root_bus(), that in turn
calls pci_bus_assign_domain_nr() which is implemented now in pcibios
for arm, it is all in patch 2. What Liviu is saying is correct, it all
depends on *when* the resource naming should be applied. For code
relying on pcibios the setup hw_pci hook() is likely to be the place where
resources are requested and the domain is not set-up yet there with
the generic PCI domains approach, hence I can't attach a domain number
to the resource names in question.

Lorenzo