linux-kernel - Re: [PATCH 6/6] arm: Allow to enable PCI

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Message-ID: <ed0e7c92-6ee1-53a9-4448-a679aed8f613@siemens.com>
Date:   Thu, 26 Apr 2018 09:19:37 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 6/6] arm: Allow to enable PCI_DOMAINS manually

On 2018-04-25 19:54, Lorenzo Pieralisi wrote:
> On Tue, Apr 24, 2018 at 05:13:42PM +0200, Jan Kiszka wrote:
>> From: Jan Kiszka <jan.kiszka@...mens.com>
>>
>> Required when running over Jailhouse, and there is already a physical
>> host controller that Jailhouse does not intercept and rather adds a
>> virtual one. That is the case for the Tegra TK1, e.g.
>>
>> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
>> ---
>>  arch/arm/Kconfig | 7 ++++++-
>>  1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
>> index a7f8e7f4b88f..5f8190cb057d 100644
>> --- a/arch/arm/Kconfig
>> +++ b/arch/arm/Kconfig
>> @@ -1248,8 +1248,13 @@ config PCI
>>  	  VESA. If you have PCI, say Y, otherwise N.
>>  
>>  config PCI_DOMAINS
>> -	bool
>> +	bool "Support for multiple PCI domains"
>>  	depends on PCI
>> +	help
>> +	  Automatically enabled if the platform supports multiple PCI host
>> +	  controllers. Say Y if running over a hypervisor like Jailhouse that
>> +	  dynamically adds further host controllers while the system is
>> +	  running. Say N otherwise.
> 
> Alternatively, you could select it under PCI_HOST_GENERIC if that's all
> you need in Jailhouse. Actually that's a change that makes sense anyway
> I think.

If that's preferred - will switch!

Thanks,
Jan

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