linux-kernel - [PATCH -mm 05/11] IA64: make sba_iommu respect the segment size limits

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Message-Id: <20071024171750S.tomof@acm.org>
Date:	Wed, 24 Oct 2007 19:48:17 +0900
From:	FUJITA Tomonori <tomof@....org>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	tony.luck@...el.com, fujita.tomonori@....ntt.co.jp
Subject: [PATCH -mm 05/11] IA64: make sba_iommu respect the segment size
 limits


This patch makes sba iommu respect segment size limits when merging sg
lists.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
---
 arch/ia64/hp/common/sba_iommu.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index bc859a3..82bf7fa 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -1265,7 +1265,7 @@ sba_fill_pdir(
  * the sglist do both.
  */
 static SBA_INLINE int
-sba_coalesce_chunks( struct ioc *ioc,
+sba_coalesce_chunks(struct ioc *ioc, struct device *dev,
 	struct scatterlist *startsg,
 	int nents)
 {
@@ -1275,6 +1275,7 @@ sba_coalesce_chunks( struct ioc *ioc,
 	struct scatterlist *dma_sg;        /* next DMA stream head */
 	unsigned long dma_offset, dma_len; /* start/len of DMA stream */
 	int n_mappings = 0;
+	unsigned int max_seg_size = dma_get_max_seg_size(dev);
 
 	while (nents > 0) {
 		unsigned long vaddr = (unsigned long) sba_sg_address(startsg);
@@ -1314,6 +1315,9 @@ sba_coalesce_chunks( struct ioc *ioc,
 			    > DMA_CHUNK_SIZE)
 				break;
 
+			if (dma_len + startsg->length > max_seg_size)
+				break;
+
 			/*
 			** Then look for virtually contiguous blocks.
 			**
@@ -1441,7 +1445,7 @@ int sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents, int di
 	** w/o this association, we wouldn't have coherent DMA!
 	** Access to the virtual address is what forces a two pass algorithm.
 	*/
-	coalesced = sba_coalesce_chunks(ioc, sglist, nents);
+	coalesced = sba_coalesce_chunks(ioc, dev, sglist, nents);
 
 	/*
 	** Program the I/O Pdir
-- 
1.5.2.4

-
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