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| author | FUJITA Tomonori <tomof@acm.org> | 2008-02-04 22:27:57 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 09:44:10 -0800 |
| commit | 740c3ce66700640a6e6136ff679b067e92125794 (patch) | |
| tree | 720f3d4c847e4576ed8a5df325d12701adde6616 /arch | |
| parent | 42d00284e16bf998f8f93ce5d061df81b0ff283e (diff) | |
| download | blackbird-op-linux-740c3ce66700640a6e6136ff679b067e92125794.tar.gz blackbird-op-linux-740c3ce66700640a6e6136ff679b067e92125794.zip | |
iommu sg merging: ppc: 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: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/dma_64.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/iommu.c | 8 |
2 files changed, 7 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/dma_64.c b/arch/powerpc/kernel/dma_64.c index 84239076a5b8..f9de2fddf4d6 100644 --- a/arch/powerpc/kernel/dma_64.c +++ b/arch/powerpc/kernel/dma_64.c @@ -68,7 +68,7 @@ static void dma_iommu_unmap_single(struct device *dev, dma_addr_t dma_handle, static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist, int nelems, enum dma_data_direction direction) { - return iommu_map_sg(dev->archdata.dma_data, sglist, nelems, + return iommu_map_sg(dev, sglist, nelems, device_to_mask(dev), direction); } diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c index a3c406aca664..d0e6fac4ef42 100644 --- a/arch/powerpc/kernel/iommu.c +++ b/arch/powerpc/kernel/iommu.c @@ -270,16 +270,18 @@ static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr, spin_unlock_irqrestore(&(tbl->it_lock), flags); } -int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist, +int iommu_map_sg(struct device *dev, struct scatterlist *sglist, int nelems, unsigned long mask, enum dma_data_direction direction) { + struct iommu_table *tbl = dev->archdata.dma_data; dma_addr_t dma_next = 0, dma_addr; unsigned long flags; struct scatterlist *s, *outs, *segstart; int outcount, incount, i; unsigned int align; unsigned long handle; + unsigned int max_seg_size; BUG_ON(direction == DMA_NONE); @@ -298,6 +300,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist, spin_lock_irqsave(&(tbl->it_lock), flags); + max_seg_size = dma_get_max_seg_size(dev); for_each_sg(sglist, s, nelems, i) { unsigned long vaddr, npages, entry, slen; @@ -344,7 +347,8 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist, /* We cannot merge if: * - allocated dma_addr isn't contiguous to previous allocation */ - if (novmerge || (dma_addr != dma_next)) { + if (novmerge || (dma_addr != dma_next) || + (outs->dma_length + s->length > max_seg_size)) { /* Can't merge: create a new segment */ segstart = s; outcount++; |
