linux-kernel - Re: [PATCH v2 00/29] Create PCI root buses with correct resources

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Date:	Fri, 14 Oct 2011 10:45:32 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/29] Create PCI root buses with correct resources

On Fri, 2011-10-14 at 09:33 -0600, Bjorn Helgaas wrote:
> On Fri, Oct 14, 2011 at 9:14 AM, James Bottomley
> <James.Bottomley@...senpartnership.com> wrote:
> > On Thu, 2011-10-13 at 22:27 -0600, Bjorn Helgaas wrote:
> >> The most generic way to create a PCI root bus is with pci_scan_bus(), but
> >> that doesn't allow you to specify what resources are available on the bus,
> >> i.e., what the host bridge apertures are.
> >
> > Do you have an actual tree for this?  The PARISC pieces look a bit
> > non-trivial and I'd like to test them out on the various sba/astro/dino
> > systems.
> 
> I don't yet, but it'd be great if you were willing to test them out,
> so I'll set one up.
> 
> While this is on your mind, I'm dubious about the pci_enable_bridges()
> call in lba_driver_probe() and the pci_bus_assign_resources() call in
> dino_probe().  These stand out as exceptions because no other arches
> do that.
> 
> If they weren't there, both places could use pci_scan_root_bus() like
> most other arches.

Right, the dino code actually has to rearrange some of the PCI resources
to make sure we get our apertures correct.  That's the specific bit I
was planning to test.  I think it's only relevant for dino SBA cards
where the bridge doesn't set up the card correctly so we have to do it
after the fact.

James


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