linux-kernel - [PATCH 13/22] x86/PCI: make sure _PAGE

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Date:	Mon,  4 Oct 2010 14:13:26 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	x86@...nel.org, Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: [PATCH 13/22] x86/PCI: make sure _PAGE_IOMAP it set on pci mappings

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

When mapping pci space via /sys or /proc, make sure we're really
doing a hardware mapping by setting _PAGE_IOMAP.

[ Impact: bugfix; make PCI mappings map the right pages ]

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Reviewed-by: "H. Peter Anvin" <hpa@...or.com>
Reviewed-by: Matthew Wilcox <willy@...ux.intel.com>
Cc: x86@...nel.org
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
---
 arch/x86/pci/i386.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 5525309..8379c2c 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -311,6 +311,8 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 		 */
 		prot |= _PAGE_CACHE_UC_MINUS;
 
+	prot |= _PAGE_IOMAP;	/* creating a mapping for IO */
+
 	vma->vm_page_prot = __pgprot(prot);
 
 	if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
-- 
1.7.0.4

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