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

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Message-ID: <CAErSpo75ovmGoeSHKJN0nckGDy-0gpn8kLPfHQ79CtcXxhPydw@mail.gmail.com>
Date:	Tue, 8 Jul 2014 12:41:50 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Liviu Dudau <Liviu.Dudau@....com>
Cc:	linux-pci <linux-pci@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	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 Tue, Jul 8, 2014 at 4:46 AM, Liviu Dudau <Liviu.Dudau@....com> wrote:
> On Tue, Jul 08, 2014 at 01:59:54AM +0100, Bjorn Helgaas wrote:

>> I wonder if it would help to make a weak pci_domain_nr() function that
>> returns "bridge->domain_nr".  Then each arch could individually drop its
>> pci_domain_nr() definition as it was converted, e.g., something like this:
>>
>>   - Convert every arch pci_domain_nr() from a #define to a non-inline
>>     function
>>   - Add bridge.domain_nr, initialized from pci_domain_nr()
>>   - Add a weak generic pci_domain_nr() that returns bridge.domain_nr
>>   - Add a way to create a host bridge in a specified domain, so we can
>>     initialize bridge.domain_nr without using pci_domain_nr()
>>   - Convert each arch to use the new creation mechanism and drop its
>>     pci_domain_nr() implementation
>
> I will try to propose a patch implementing this.

I think this is more of an extra credit, cleanup sort of thing.  I
don't think it advances your primary goal of (I think) getting arm64
PCI support in.  So my advice is to not worry about unifying domain
handling until later.

Bjorn
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