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| author |   FUJITA Tomonori <tomof@acm.org> | 2008-02-04 22:28:02 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 09:44:10 -0800 |
| commit | fde6a3c82d67f592eb587be4d12222b0ae6d4321 (patch) | |
| tree | 33c79ecea87dc99a9c4961b6ab42d53c46f1f8f2 /arch/sparc64/kernel/iommu_common.c | |
| parent | iommu sg merging: alpha: make pci_iommu respect the segment size limits (diff) | |
| download | linux-dev-fde6a3c82d67f592eb587be4d12222b0ae6d4321.tar.xz linux-dev-fde6a3c82d67f592eb587be4d12222b0ae6d4321.zip | |
iommu sg merging: sparc64: 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: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sparc64/kernel/iommu_common.c')
| -rw-r--r-- | arch/sparc64/kernel/iommu_common.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/sparc64/kernel/iommu_common.c b/arch/sparc64/kernel/iommu_common.c index efd5dff85f60..72a4acfe8c7b 100644 --- a/arch/sparc64/kernel/iommu_common.c +++ b/arch/sparc64/kernel/iommu_common.c @@ -4,6 +4,7 @@ * Copyright (C) 1999 David S. Miller (davem@redhat.com) */ +#include <linux/dma-mapping.h> #include "iommu_common.h" /* You are _strongly_ advised to enable the following debugging code @@ -201,21 +202,24 @@ void verify_sglist(struct scatterlist *sglist, int nents, iopte_t *iopte, int np } #endif -unsigned long prepare_sg(struct scatterlist *sg, int nents) +unsigned long prepare_sg(struct device *dev, struct scatterlist *sg, int nents) { struct scatterlist *dma_sg = sg; unsigned long prev; u32 dent_addr, dent_len; + unsigned int max_seg_size; prev = (unsigned long) sg_virt(sg); prev += (unsigned long) (dent_len = sg->length); dent_addr = (u32) ((unsigned long)(sg_virt(sg)) & (IO_PAGE_SIZE - 1UL)); + max_seg_size = dma_get_max_seg_size(dev); while (--nents) { unsigned long addr; sg = sg_next(sg); addr = (unsigned long) sg_virt(sg); - if (! VCONTIG(prev, addr)) { + if (! VCONTIG(prev, addr) || + dent_len + sg->length > max_seg_size) { dma_sg->dma_address = dent_addr; dma_sg->dma_length = dent_len; dma_sg = sg_next(dma_sg); |