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

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Date:	Mon, 28 Sep 2015 14:48:08 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Julien Grall <julien.grall@...rix.com>
CC:	<xen-devel@...ts.xenproject.org>,
	<linux-arm-kernel@...ts.infradead.org>, <ian.campbell@...rix.com>,
	<stefano.stabellini@...citrix.com>, <linux-kernel@...r.kernel.org>,
	Robert Richter <robert.richter@...iumnetworks.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	"David Vrabel" <david.vrabel@...rix.com>
Subject: Re: [PATCH] xen/pci: Don't build Xen pci code for ARM and ARM64

On Mon, 28 Sep 2015, 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.
> 
> Reported-by: Robert Richter <robert.richter@...iumnetworks.com>
> Signed-off-by: Julien Grall <julien.grall@...rix.com>
> 
> ---
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: David Vrabel <david.vrabel@...rix.com>
> ---
>  drivers/xen/Kconfig  | 6 +++++-
>  drivers/xen/Makefile | 2 +-
>  2 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
> index 73708ac..6bcc8b0 100644
> --- a/drivers/xen/Kconfig
> +++ b/drivers/xen/Kconfig
> @@ -168,7 +168,7 @@ config XEN_TMEM
>  
>  config XEN_PCIDEV_BACKEND
>  	tristate "Xen PCI-device backend driver"
> -	depends on PCI && X86 && XEN
> +	depends on XEN_PCI
>  	depends on XEN_BACKEND
>  	default m
>  	help
> @@ -189,6 +189,10 @@ config XEN_PCIDEV_BACKEND
>  
>  	  If in doubt, say m.
>  
> +config XEN_PCI
> +	def_bool y
> +	depends on PCI && !ARM && !ARM64

This is confusing because x86 already has PCI_XEN, see arch/x86/Kconfig.
Just move PCI_XEN from arch/x86/Kconfig to here and disable it for ARM?


>  config XEN_SCSI_BACKEND
>  	tristate "XEN SCSI backend driver"
>  	depends on XEN && XEN_BACKEND && TARGET_CORE
> diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
> index e293bc5..c9f23b7 100644
> --- a/drivers/xen/Makefile
> +++ b/drivers/xen/Makefile
> @@ -11,7 +11,7 @@ CFLAGS_features.o			:= $(nostackp)
>  
>  CFLAGS_efi.o				+= -fshort-wchar
>  
> -dom0-$(CONFIG_PCI) += pci.o
> +dom0-$(CONFIG_XEN_PCI) += pci.o
>  dom0-$(CONFIG_USB_SUPPORT) += dbgp.o
>  dom0-$(CONFIG_XEN_ACPI) += acpi.o $(xen-pad-y)
>  xen-pad-$(CONFIG_X86) += xen-acpi-pad.o
> -- 
> 2.1.4
> 
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