linux-kernel - [PATCH V3 06/21] XEN / PCI: Remove the dependence on arch x86 when PCI

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Message-Id: <1452691267-32240-7-git-send-email-tn@semihalf.com>
Date:	Wed, 13 Jan 2016 14:20:52 +0100
From:	Tomasz Nowicki <tn@...ihalf.com>
To:	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, Stefano.Stabellini@...citrix.com
Cc:	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,
	Tomasz Nowicki <tn@...ihalf.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: [PATCH V3 06/21] XEN / PCI: Remove the dependence on arch x86 when PCI_MMCONFIG=y

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>
Tested-by: Jeremy Linton <jeremy.linton@....com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Acked-by: Stefano Stabellini <stefano.stabellini@...citrix.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
 
 static bool __read_mostly pci_seg_supported = true;
 
@@ -222,9 +219,6 @@ static int __init xen_mcfg_late(void)
 	if (!xen_initial_domain())
 		return 0;
 
-	if ((pci_probe & PCI_PROBE_MMCONF) == 0)
-		return 0;
-
 	if (list_empty(&pci_mmcfg_list))
 		return 0;
 
-- 
1.9.1