linux-kernel - Re: [PATCH 01/11] ARM64 / PCI: introduce struct pci

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Message-ID: <55EEE42B.8000305@linaro.org>
Date:	Tue, 08 Sep 2015 21:35:39 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Ganapatrao Kulkarni <gpkulkarni@...il.com>
CC:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Yijing Wang <wangyijing@...wei.com>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"msalter@...hat.com" <msalter@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 01/11] ARM64 / PCI: introduce struct pci_controller for
 ACPI

On 09/07/2015 04:45 PM, Lorenzo Pieralisi wrote:
> On Mon, Sep 07, 2015 at 05:14:22AM +0100, Ganapatrao Kulkarni wrote:
>> Hi Hanjun,
>>
>> On Wed, May 27, 2015 at 1:51 PM, Hanjun Guo <hanjun.guo@...aro.org> wrote:
>>> Hi Liviu,
>>>
>>> On 2015???05???27??? 01:20, Jiang Liu wrote:
>>>>
>>>> On 2015/5/27 0:58, Liviu Dudau wrote:
>>>>>
>>>>> On Tue, May 26, 2015 at 01:49:14PM +0100, Hanjun Guo wrote:
>>>>>>
>>>>>> ARM64 ACPI based PCI host bridge init needs a arch dependent
>>>>>> struct pci_controller to accommodate common PCI host bridge
>>>>>> code which is introduced later, or it will lead to compile
>>>>>> errors on ARM64.
>>>>>
>>>>>
>>>>> Hi Hanjun,
>>>>>
>>>>> Two questions: why don't you introduce this patch next to the
>>>>> one that is going to make use of it (or even merge it there)?
>>>
>>>
>>> this is because of this patch is needed by Jiang Liu's patch set
>>> to fix the compile error on ARM64, I'd rather do that, but It's
>>> better to let Jiang Liu's patch goes in, and then this one, that's
>>> why I prepared a single patch for the struct. (I mentioned it
>>> in the cover letter)
>>>
>>>>> Second, why is the whole struct pci_controller not surrounded
>>>>> by #ifdef CONFIG_ACPI as you are implying that this is needed
>>>>> only for ACPI?
>>>
>>>
>>> I hope it can be reused, since the NUMA node and segment (domain)
>>> is both needed for DT and ACPI, if it's not the case foe now, I
>>> can surrounded them all by #ifdef CONFIG_ACPI.
>> we can make use of this structure to hold pci to numa node
>> mapping(pcibus_to_node).
>> can you please pull node member out of  CONFIG_ACPI ifdef.
>> or you can put only acpi_device under ifdef.
>
> That struct disappeared in the latest series:
>
> https://lkml.org/lkml/2015/6/8/443

Yes, I think that is the right direction going.

>
> we have to have a common way to handle the NUMA info in DT and ACPI
> so we should still find a solution that can be shared between the two,
> it is yet another thing to take into account for PCI ACPI on arm64.

Agreed, we can take that into account when finished the basic
support.

Thanks
Hanjun
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