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 15:23:28 +0100
From:	Julien Grall <julien.grall@...rix.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.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 28/09/15 15:02, Boris Ostrovsky wrote:
> 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).

Hmmmm. It looks like that the mmconfig is not yet supported upstream for
ARM64. So even with arch function for pci_probe so it won't work.

I hit the compilation issue on a 4.2 with patched applied for some
hardware enablement. Some of them if for mmconfig.

I should have check it before sending it. Sorry for the noise.

Regards,

-- 
Julien Grall
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