Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d1b5163206769aa93271bc1029e877ea9f920a5d
Commit: d1b5163206769aa93271bc1029e877ea9f920a5d
Parent: fde6a3c82d67f592eb587be4d12222b0ae6d4321
Author: FUJITA Tomonori <[EMAIL PROTECTED]>
AuthorDate: Mon Feb 4 22:28:03 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Feb 5 09:44:10 2008 -0800
iommu sg merging: parisc: make iommu respect the segment size limits
This patch makes 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: Kyle McMartin <[EMAIL PROTECTED]>
Acked-by: Grant Grundler <[EMAIL PROTECTED]>
Cc: Matthew Wilcox <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
drivers/parisc/ccio-dma.c | 2 +-
drivers/parisc/iommu-helpers.h | 7 ++++++-
drivers/parisc/sba_iommu.c | 2 +-
3 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c
index ca52307..d08b284 100644
--- a/drivers/parisc/ccio-dma.c
+++ b/drivers/parisc/ccio-dma.c
@@ -941,7 +941,7 @@ ccio_map_sg(struct device *dev, struct scatterlist *sglist,
int nents,
** w/o this association, we wouldn't have coherent DMA!
** Access to the virtual address is what forces a two pass algorithm.
*/
- coalesced = iommu_coalesce_chunks(ioc, sglist, nents, ccio_alloc_range);
+ coalesced = iommu_coalesce_chunks(ioc, dev, sglist, nents,
ccio_alloc_range);
/*
** Program the I/O Pdir
diff --git a/drivers/parisc/iommu-helpers.h b/drivers/parisc/iommu-helpers.h
index 0a1f99a..97ba828 100644
--- a/drivers/parisc/iommu-helpers.h
+++ b/drivers/parisc/iommu-helpers.h
@@ -95,12 +95,14 @@ iommu_fill_pdir(struct ioc *ioc, struct scatterlist
*startsg, int nents,
*/
static inline unsigned int
-iommu_coalesce_chunks(struct ioc *ioc, struct scatterlist *startsg, int nents,
+iommu_coalesce_chunks(struct ioc *ioc, struct device *dev,
+ struct scatterlist *startsg, int nents,
int (*iommu_alloc_range)(struct ioc *, size_t))
{
struct scatterlist *contig_sg; /* contig chunk head */
unsigned long dma_offset, dma_len; /* start/len of DMA stream */
unsigned int n_mappings = 0;
+ unsigned int max_seg_size = dma_get_max_seg_size(dev);
while (nents > 0) {
@@ -142,6 +144,9 @@ iommu_coalesce_chunks(struct ioc *ioc, struct scatterlist
*startsg, int nents,
IOVP_SIZE) > DMA_CHUNK_SIZE))
break;
+ if (startsg->length + dma_len > max_seg_size)
+ break;
+
/*
** Next see if we can append the next chunk (i.e.
** it must end on one page and begin on another
diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index e527a0e..d06627c 100644
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -946,7 +946,7 @@ sba_map_sg(struct device *dev, struct scatterlist *sglist,
int nents,
** w/o this association, we wouldn't have coherent DMA!
** Access to the virtual address is what forces a two pass algorithm.
*/
- coalesced = iommu_coalesce_chunks(ioc, sglist, nents, sba_alloc_range);
+ coalesced = iommu_coalesce_chunks(ioc, dev, sglist, nents,
sba_alloc_range);
/*
** Program the I/O Pdir
-
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