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

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Message-ID: <20140711150823.GU6501@e106497-lin.cambridge.arm.com>
Date:	Fri, 11 Jul 2014 16:08:23 +0100
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.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 03:11:16PM +0100, Catalin Marinas 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.
> 
> (Liviu is thinking of an alternative API but maybe he could briefly
> describe it here before posting a new series)
> 
> -- 
> Catalin


My plan is to keep the domain number in the pci_host_bridge and split
the creation of the pci_host_bridge out of the pci_create_root_bus().
The new function (tentatively called pci_create_new_root_bus()) will
no longer call pci_alloc_host_bridge() but will accept it as a
parameter, allowing one to be able to set the domain_nr ahead of the
root bus creation.

Best regards,
Liviu

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    ¯\_(ツ)_/¯

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