linux-kernel - [PATCH 1/1] x86/iommu: fix dma pte address size error

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Date:	Fri, 24 May 2013 08:35:56 +0800
From:	"Li, Zhen-Hua" <zhen-hual@...com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Vinod Koul <vinod.koul@...el.com>, Dan Williams <djbw@...com>,
	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>
Cc:	"Li, Zhen-Hua" <zhen-hual@...com>
Subject: [PATCH 1/1] x86/iommu: fix dma pte address size error

In Intel Vt-D specs, Chapter 9.3 Page-Table Entry,
The size of ADDR(address) field is 12:51, but the function dma_pte_addr
 treats it as 12:63.

Signed-off-by: Li, Zhen-Hua <zhen-hual@...com>
---
 drivers/iommu/intel-iommu.c   |    4 ++--
 include/linux/dma_remapping.h |    2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index b4f0e28..c6d2847 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -311,10 +311,10 @@ static inline void dma_set_pte_prot(struct dma_pte *pte, unsigned long prot)
 static inline u64 dma_pte_addr(struct dma_pte *pte)
 {
 #ifdef CONFIG_64BIT
-	return pte->val & VTD_PAGE_MASK;
+	return pte->val & DMA_PTE_MASK;
 #else
 	/* Must have a full atomic 64-bit read */
-	return  __cmpxchg64(&pte->val, 0ULL, 0ULL) & VTD_PAGE_MASK;
+	return  __cmpxchg64(&pte->val, 0ULL, 0ULL) & DMA_PTE_MASK;
 #endif
 }
 
diff --git a/include/linux/dma_remapping.h b/include/linux/dma_remapping.h
index 57c9a8a..7a1e212 100644
--- a/include/linux/dma_remapping.h
+++ b/include/linux/dma_remapping.h
@@ -16,6 +16,8 @@
 #define DMA_PTE_WRITE (2)
 #define DMA_PTE_LARGE_PAGE (1 << 7)
 #define DMA_PTE_SNP (1 << 11)
+#define DMA_PTE_ADD_LENGTH (40)
+#define DMA_PTE_MASK	((((u64)1 << DMA_PTE_ADD_LENGTH) - 1) << VTD_PAGE_SHIFT)
 
 #define CONTEXT_TT_MULTI_LEVEL	0
 #define CONTEXT_TT_DEV_IOTLB	1
-- 
1.7.10.4

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