Re: Using a generic PciHostBridgeDxe driver for a multi-PCIe-domain platform

[Vladimir Olovyannikov <vladimir.olovyannikov@broadcom.com>]

> -----Original Message-----
> From: Ard Biesheuvel [mailto:ard.biesheuvel@linaro.org]
> Sent: May-30-17 9:35 AM
> To: Vladimir Olovyannikov
> Cc: edk2-devel@lists.01.org
> Subject: Re: Using a generic PciHostBridgeDxe driver for a
> multi-PCIe-domain
> platform
>
> On 30 May 2017 at 16:23, Vladimir Olovyannikov
> <vladimir.olovyannikov@broadcom.com> wrote:
> > Hi,
> >
> > I've started PCIe stack implementation design for an armv8 aarch64
> > platform.
> > The platform's PCIe represents several host bridges, and each
> > hostbridge has one rootbridge.
> > They do not share any resources between each other.
> > Looking into the PciHostBridgeDxe implementation I can see that it
> > supports only one hostbridge, and there is a comment:
> > // Most systems in the world including complex servers have only one
> > Host Bridge.
> >
> > So in my case should I create my own PciHostBridgeDxe driver
> > supporting multiple hostbridges and do not use the Industry standard
> driver?
> > I am very new to it, and will appreciate any help or idea.
> >
>
> As far as I can tell, PciHostBridgeLib allows you to return an arbitrary
> number
> of PCI host bridges, each with their own segment number. I haven't tried
> it
> myself, but it is worth a try whether returning an array of all host
> bridges on
> your platform works as expected.

Thank you Ard,
Right, but PciHostBridgeDxe seems to work with one hostbridge.
I am confused that

// Make sure all root bridges share the same ResourceAssigned value

The rootbridges are independent on the platform, and should not share
anything. Or am I missing anything?
Anyway, I will try to return multiple hostbridges in the PciHostBridgeLib.

Thank you,
Vladimir