linux-kernel - Re: [PATCH] pci: generic host: make it more generic

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Message-ID: <CACVXFVN1HmyaiR7fXAxjwkBBJJZdW5bNpujfrPPeWRGZ=8FOig@mail.gmail.com>
Date:	Wed, 12 Nov 2014 16:58:00 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	alvise rigo <a.rigo@...tualopensystems.com>
Subject: Re: [PATCH] pci: generic host: make it more generic

On Wed, Nov 12, 2014 at 10:47 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Tue, Nov 11, 2014 at 7:12 PM, Ming Lei <ming.lei@...onical.com> wrote:
>> ...
>> Do you think it is doable to introduce a option(from module
>> parameter, or device tree, ...) to let the driver and PCI core
>> ignore/bypass all pcibios handling for the generic bus?
>
> No, I don't think so.

Could you explain a bit? In VM world, it might be reasonable to
claim that there is no pcibios service or pcibios service needn't.

IMO it isn't easy to make a cross-arch PCI generic controller
driver if pcibios handling has to be involved.

Thanks,
Ming Lei
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