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

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Message-ID: <20140711141115.GB16321@arm.com>
Date:	Fri, 11 Jul 2014 15:11:16 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Bjorn Helgaas <bhelgaas@...gle.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 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.

(Liviu is thinking of an alternative API but maybe he could briefly
describe it here before posting a new series)

-- 
Catalin
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