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xen-devel
[Xen-devel] [PATCH 08/10] x86/pci: make sure _PAGE_IOMAP it set on pci m
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To: |
Ingo Molnar <mingo@xxxxxxx> |
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Subject: |
[Xen-devel] [PATCH 08/10] x86/pci: make sure _PAGE_IOMAP it set on pci mappings |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Tue, 12 May 2009 14:48:09 -0700 |
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Cc: |
Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Joerg Roedel <joerg.roedel@xxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxxxx> |
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Tue, 12 May 2009 16:24:37 -0700 |
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From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
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@xxxxxxxxxx>
Reviewed-by: "H. Peter Anvin" <hpa@xxxxxxxxx>
Reviewed-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
---
arch/x86/pci/i386.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index a85bef2..88a1080 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -278,6 +278,9 @@ int pci_mmap_page_range(struct pci_dev *dev, struct
vm_area_struct *vma,
return -EINVAL;
prot = pgprot_val(vma->vm_page_prot);
+
+ prot |= _PAGE_IOMAP; /* creating a mapping for IO */
+
if (pat_enabled && write_combine)
prot |= _PAGE_CACHE_WC;
else if (pat_enabled || boot_cpu_data.x86 > 3)
--
1.6.0.6
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