linux-kernel - Re: [PATCH v8 6/9] pci: Introduce a domain number for pci_host

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Message-ID: <CAErSpo7C8qzmdp+XgVi2ysXj_NcgvVY7RVfBZ2PHimLzrzANMQ@mail.gmail.com>
Date:	Fri, 11 Jul 2014 11:02:56 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Liviu Dudau <Liviu.Dudau@....com>,
	linux-pci <linux-pci@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Arnd Bergmann <arnd@...db.de>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Tanmay Inamdar <tinamdar@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Sinan Kaya <okaya@...eaurora.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Suravee Suthikulanit <suravee.suthikulpanit@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Device Tree ML <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v8 6/9] pci: Introduce a domain number for pci_host_bridge.

On Fri, Jul 11, 2014 at 8:11 AM, Catalin Marinas
<catalin.marinas@....com> wrote:
> On Thu, Jul 10, 2014 at 11:36:10PM +0100, Bjorn Helgaas wrote:
>> Most of the rest of the v7 discussion was about "Introduce a domain
>> number for pci_host_bridge."  I think we should add arm64 using the
>> existing pci_scan_root_bus() and keep the domain number in the arm64
>> sysdata structure like every other arch does.  Isn't that feasible?
>> We can worry about domain unification later.
>
> I think that's what we were trying to avoid, adding an arm64-specific
> pci_sys_data structure (and arm64-specific API). IIUC, avoiding this
> would allow the host controller drivers to use the sysdata pointer for
> their own private data structures.
>
> Also since you can specify the domain number via DT (and in Liviu's
> v8 patches read by of_create_pci_host_bridge), I think it would make
> sense to have it stored in some generic data structures (e.g.
> pci_host_bridge) rather than in an arm64 private sysdata.

It would definitely be nice to keep the domain in a generic data
structure rather than an arm64-specific one.  But every other arch
keeps it in an arch-specific structure today, and I think following
that existing pattern is the quickest way forward.

But you mentioned arm64-specific API, too.  What do you have in mind
there?  I know there will be arm64 implementations of various
pcibios_*() functions (just like for every other arch), but it sounds
like there might be something else?

Bjorn
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