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

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Message-ID: <20141112123232.GE6759@red-moon>
Date:	Wed, 12 Nov 2014 12:32:32 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.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 10:51:31AM +0000, Ming Lei wrote:
> On Wed, Nov 12, 2014 at 5:58 PM, Lorenzo Pieralisi
> <lorenzo.pieralisi@....com> wrote:
> > On Wed, Nov 12, 2014 at 02:12:12AM +0000, Ming Lei wrote:
> >> On Wed, Nov 12, 2014 at 2:24 AM, Lorenzo Pieralisi
> >> <lorenzo.pieralisi@....com> wrote:
> >> > On Tue, Nov 11, 2014 at 02:02:20PM +0000, Ming Lei wrote:
> >> >
> >> > [...]
> >> >
> >> >> > http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/296535.html
> >> >> >
> >> >> > Patch above is already queued and applies most of the changes you have posted
> >> >> > above.
> >> >>
> >> >> I should have looked at list first before writing the patch, :-(
> >> >>
> >> >> Could you make it more generic so that other ARCHs(at least ARM64)
> >> >> can benefit from it too?
> >> >
> >> > That's our current goal, we are carrying out clean-ups to remove arch
> >> > dependency and move code to the generic layer PCI layer.
> >>
> >> OK, I am glad to test them after you post them out.
> >>
> >> At least, the 'struct gen_pci' pointer can be put in driver data
> >> of the platform_device now, which may remove dependency on
> >> pci_sysdata in this driver.  But ARCH's pcibios code still may
> >> access 'pci_sysdata', do you have patches or solution to handle
> >> this issue?
> >
> > I will consider adding struct gen_pci pointer as platform device
> > driver data, we are working on removing pci_sys_data dependency in the ARM
> > pcibios backend, and I do not think we are far from achieving that.
> 
> Other ARCHs has sort of pcibios backend too, so that said it still
> depends on ARM or ARM64, doesn't it?

Yes, so ? If you think there is a way to make this host controller work
on all arches you fancy using it on with no arch dependency in a proper
way step up to the plate and post the code, we will duly review it.

Thanks,
Lorenzo
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