linux-kernel - Re: [RFC 2/4] PCI: generic: Add support for ARM64 and MSI(x)

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Date:	Thu, 6 Nov 2014 09:52:31 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mark Rutland <Mark.Rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Liviu Dudau <Liviu.Dudau@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Subject: Re: [RFC 2/4] PCI: generic: Add support for ARM64 and MSI(x)

On Thu, Nov 06, 2014 at 12:05:48AM +0000, Arnd Bergmann wrote:
> On Wednesday 05 November 2014 16:39:21 Bjorn Helgaas wrote:
> > On Wed, Oct 22, 2014 at 10:52:19PM +0200, Arnd Bergmann wrote:
> > > On Wednesday 22 October 2014 16:59:14 Lorenzo Pieralisi wrote:
> > > > On Wed, Oct 01, 2014 at 10:38:45AM +0100, Arnd Bergmann wrote:
> > > > 
> > > > [...]
> > > > 
> > > > > The arm32 implementations of pci_domain_nr/pci_proc_domain can probably be
> > > > > removed if we change the arm32 pcibios_init_hw function to call the new
> > > > > interfaces that set the domain number.
> > > > 
> > > > I wished, but it is a bit more complicated than I thought unfortunately,
> > > > mostly because some drivers, eg cns3xxx set the domain numbers
> > > > statically in pci_sys_data and this sets a chain of dependency that is
> > > > not easy to untangle. I think cns3xxx is the only legacy driver that "uses"
> > > > the domain number (in pci_sys_data) in a way that clashes with the
> > > > generic domain_nr implementation, I need to give it more thought.
> > > 
> > > Just had a look at that driver, shouldn't be too hard to change, see below.
> > > 
> > > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > 
> > This patch is in my patchwork, but it lacks a topic & changelog and I'm not
> > sure of its state, so I'm going to drop it for now.  Please post it again
> > if you want me to do something with it.  I guess it only touches arch/arm,
> > so it would probably be merged via your tree anyway.
> 
> Lorenzo has posted an updated version as
> 
> "arm: cns3xxx: pci: remove artificial dependency on pci_sys_data domain",
> and a second patch that depends on it. That is the version we should be
> merging, though I'm not sure through which tree.

I am posting a v2 shortly, let's discuss the best way to merge it then.

Thanks,
Lorenzo
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