linux-kernel - Re: [PATCH V2 06/23] XEN / PCI: Remove the dependence on arch x86 when PCI

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Date:	Thu, 17 Dec 2015 11:25:52 +0100
From:	Tomasz Nowicki <tn@...ihalf.com>
To:	Stefano.Stabellini@...citrix.com
Cc:	bhelgaas@...gle.com, arnd@...db.de, will.deacon@....com,
	catalin.marinas@....com, rjw@...ysocki.net, hanjun.guo@...aro.org,
	Lorenzo.Pieralisi@....com, okaya@...eaurora.org,
	jiang.liu@...ux.intel.com, robert.richter@...iumnetworks.com,
	mw@...ihalf.com, Liviu.Dudau@....com, ddaney@...iumnetworks.com,
	tglx@...utronix.de, wangyijing@...wei.com,
	Suravee.Suthikulpanit@....com, msalter@...hat.com,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-acpi@...ts.linaro.org, jchandra@...adcom.com,
	jcm@...hat.com, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH V2 06/23] XEN / PCI: Remove the dependence on arch x86
 when PCI_MMCONFIG=y

On 16.12.2015 16:16, Tomasz Nowicki wrote:
> In drivers/xen/pci.c, there are arch x86 dependent codes when
> CONFIG_PCI_MMCONFIG is enabled, since CONFIG_PCI_MMCONFIG
> depends on ACPI, so this will prevent XEN PCI running on other
> architectures using ACPI with PCI_MMCONFIG enabled (such as ARM64).
>
> Fortunatly, it can be sloved in a simple way. In drivers/xen/pci.c,
> the only x86 dependent code is if ((pci_probe & PCI_PROBE_MMCONF) == 0),
> and it's defined in asm/pci_x86.h, the code means that
> if the PCI resource is not probed in PCI_PROBE_MMCONF way, just
> ingnore the xen mcfg init. Actually this is duplicate, because
> if PCI resource is not probed in PCI_PROBE_MMCONF way, the
> pci_mmconfig_list will be empty, and the if (list_empty())
> after it will do the same job.
>
> So just remove the arch related code and the head file, this
> will be no functional change for x86, and also makes xen/pci.c
> usable for other architectures.
>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> CC: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> CC: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: Stefano Stabellini <Stefano.Stabellini@...citrix.com>
> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> ---
>   drivers/xen/pci.c | 6 ------
>   1 file changed, 6 deletions(-)
>
> diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
> index 6785ebb..9a8dbe3 100644
> --- a/drivers/xen/pci.c
> +++ b/drivers/xen/pci.c
> @@ -28,9 +28,6 @@
>   #include <asm/xen/hypervisor.h>
>   #include <asm/xen/hypercall.h>
>   #include "../pci/pci.h"
> -#ifdef CONFIG_PCI_MMCONFIG
> -#include <asm/pci_x86.h>
> -#endif

I noticed that I forgot about:
+#include <linux/ecam.h>

Sorry.

Tomasz
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