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

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Message-ID: <20180425175446.GC21628@e107981-ln.cambridge.arm.com>
Date:   Wed, 25 Apr 2018 18:54:46 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Jan Kiszka <jan.kiszka@...mens.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 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.

Lorenzo