linux-kernel - Re: [Xen-devel] [PATCH] xen/pci: Don't build Xen pci code for ARM and ARM64

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Date:	Mon, 28 Sep 2015 10:02:57 -0400
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Julien Grall <julien.grall@...rix.com>,
	David Vrabel <david.vrabel@...rix.com>,
	xen-devel@...ts.xenproject.org
CC:	ian.campbell@...rix.com, stefano.stabellini@...citrix.com,
	linux-kernel@...r.kernel.org,
	Robert Richter <robert.richter@...iumnetworks.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [Xen-devel] [PATCH] xen/pci: Don't build Xen pci code for ARM
 and ARM64

On 09/28/2015 09:59 AM, Julien Grall wrote:
> Hi David,
>
> On 28/09/15 14:52, David Vrabel wrote:
>> On 28/09/15 14:30, Julien Grall wrote:
>>> The PCI support for Xen doesn't compile on ARM/ARM64 when
>>> CONFIG_PCI_MMCONFIG=y:
>>>
>>> drivers/xen/pci.c:31:25: fatal error: asm/pci_x86.h: No such file or
>>> directory
>>>   #include <asm/pci_x86.h>
>>>
>>> Although, Xen is not currently involved in PCI management for ARM/ARM64.
>>> There is plan to support it, but it would require some changes in Linux
>>> side.
>>>
>>> For now, introduce a new config options XEN_PCI which will be turned off
>>> for ARM platform.
>> Since PCI_MMCONFIG isn't x86 specific and its use in drivers/xen/pci.c
>> is, can you fix this by changing to #ifdef CONFIG_X86?
> Well, it may be possible that we need this code for ARM/ARM64.
>
>  From the origin thread [1], it wasn't clear what is the correct
> solution. So I think that disabling the Xen PCI code for now is the
> right solution.
>
> Note, that it's still possible to use PCI in DOM0 on ARM64 platform
> without this code.
>
> Regards,
>
> [1] https://lkml.org/lkml/2015/8/6/510
>

Can we then implement Robert's proposals from that thread and have an 
arch function for pci_probe? It will be a nop on ARM. (I think that was 
the only problem here).

-boris
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