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From: Konrad Rzeszutek Wilk on 4 Aug 2010 14:30
From: Jeremy Fitzhardinge <jeremy.fitzhardinge(a)citrix.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(a)citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk(a)oracle.com>
Reviewed-by: "H. Peter Anvin" <hpa(a)zytor.com>
Reviewed-by: Matthew Wilcox <willy(a)linux.intel.com>
Cc: x86(a)kernel.org
Cc: Jesse Barnes <jbarnes(a)virtuousgeek.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,
--
1.7.0.1

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