linux-kernel - Re: [PATCH] pci: generic host: make it more generic

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Date:	Thu, 13 Nov 2014 09:56:06 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	alvise rigo <a.rigo@...tualopensystems.com>
Subject: Re: [PATCH] pci: generic host: make it more generic

On Wed, Nov 12, 2014 at 8:32 PM, Lorenzo Pieralisi
<lorenzo.pieralisi@....com> wrote:
> On Wed, Nov 12, 2014 at 10:51:31AM +0000, Ming Lei wrote:
>> On Wed, Nov 12, 2014 at 5:58 PM, Lorenzo Pieralisi
>> <lorenzo.pieralisi@....com> wrote:
>> > On Wed, Nov 12, 2014 at 02:12:12AM +0000, Ming Lei wrote:
>> >> On Wed, Nov 12, 2014 at 2:24 AM, Lorenzo Pieralisi
>> >> <lorenzo.pieralisi@....com> wrote:
>> >> > On Tue, Nov 11, 2014 at 02:02:20PM +0000, Ming Lei wrote:
>> >> >
>> >> > [...]
>> >> >
>> >> >> > http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/296535.html
>> >> >> >
>> >> >> > Patch above is already queued and applies most of the changes you have posted
>> >> >> > above.
>> >> >>
>> >> >> I should have looked at list first before writing the patch, :-(
>> >> >>
>> >> >> Could you make it more generic so that other ARCHs(at least ARM64)
>> >> >> can benefit from it too?
>> >> >
>> >> > That's our current goal, we are carrying out clean-ups to remove arch
>> >> > dependency and move code to the generic layer PCI layer.
>> >>
>> >> OK, I am glad to test them after you post them out.
>> >>
>> >> At least, the 'struct gen_pci' pointer can be put in driver data
>> >> of the platform_device now, which may remove dependency on
>> >> pci_sysdata in this driver.  But ARCH's pcibios code still may
>> >> access 'pci_sysdata', do you have patches or solution to handle
>> >> this issue?
>> >
>> > I will consider adding struct gen_pci pointer as platform device
>> > driver data, we are working on removing pci_sys_data dependency in the ARM
>> > pcibios backend, and I do not think we are far from achieving that.
>>
>> Other ARCHs has sort of pcibios backend too, so that said it still
>> depends on ARM or ARM64, doesn't it?
>
> Yes, so ? If you think there is a way to make this host controller work

I mean suppose the driver/device is only for ARM and ARM64, it
should be easy to support, and it may not be necessary to remove
pci_sys_data dependency in the ARM, such as:

- make a different code path for ARM64
- or like this patch to fake sysdata for ARM
- or what ever

> on all arches you fancy using it on with no arch dependency in a proper
> way step up to the plate and post the code, we will duly review it.

The only way I thought of is to bypass pcibios handling for the
generic host controller, but it may not be agreed.

Thanks,
Ming Lei
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