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| author | FUJITA Tomonori <tomof@acm.org> | 2008-02-04 22:28:03 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 09:44:10 -0800 |
| commit | d1b5163206769aa93271bc1029e877ea9f920a5d (patch) | |
| tree | 436b2d39dba80d28b0ec3a6f602c813cf0ec4fe0 /drivers/parisc/iommu-helpers.h | |
| parent | fde6a3c82d67f592eb587be4d12222b0ae6d4321 (diff) | |
| download | linux-d1b5163206769aa93271bc1029e877ea9f920a5d.tar.gz | |
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 <fujita.tomonori@lab.ntt.co.jp> Cc: Jeff Garzik <jeff@garzik.org> Cc: James Bottomley <James.Bottomley@steeleye.com> Acked-by: Jens Axboe <jens.axboe@oracle.com> Cc: Kyle McMartin <kyle@mcmartin.ca> Acked-by: Grant Grundler <grundler@parisc-linux.org> Cc: Matthew Wilcox <willy@debian.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/parisc/iommu-helpers.h')
| -rw-r--r-- | drivers/parisc/iommu-helpers.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/parisc/iommu-helpers.h b/drivers/parisc/iommu-helpers.h index 0a1f99a2e93e..97ba8286c596 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 |