From 9cf0669746be19a4906a6c48920060bcf54c708b Mon Sep 17 00:00:00 2001
From: Sheng Yang <sheng@linux.intel.com>
Date: Wed, 18 Mar 2009 15:33:07 +0800
Subject: intel-iommu: VT-d page table to support snooping control bit

The user can request to enable snooping control through VT-d page table.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---
 include/linux/iommu.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'include/linux/iommu.h')

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 0cf3a4e..3af4ffd 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -21,6 +21,7 @@
 
 #define IOMMU_READ	(1)
 #define IOMMU_WRITE	(2)
+#define IOMMU_CACHE	(4) /* DMA cache coherency */
 
 struct device;
 
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