Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a031bbcb8d7559d61f383880f23dd0e047247410
Commit: a031bbcb8d7559d61f383880f23dd0e047247410
Parent: 740c3ce66700640a6e6136ff679b067e92125794
Author: FUJITA Tomonori <[EMAIL PROTECTED]>
AuthorDate: Mon Feb 4 22:27:58 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Feb 5 09:44:10 2008 -0800
iommu sg merging: 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 <[EMAIL PROTECTED]>
Cc: Jeff Garzik <[EMAIL PROTECTED]>
Cc: James Bottomley <[EMAIL PROTECTED]>
Acked-by: Jens Axboe <[EMAIL PROTECTED]>
Cc: "Luck, Tony" <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
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 45bf04e..c412fe6 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
-
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