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[SPARC64]: Eliminate PCI IOMMU dma mapping size limit.
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The hairy fast allocator in the sparc64 PCI IOMMU code
has a hard limit of 256 pages.  Certain devices can
exceed this when performing very large I/Os.

So replace with a more simple allocator, based largely
upon the arch/ppc64/kernel/iommu.c code.

Signed-off-by: David S. Miller <davem@davemloft.net>
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David S. Miller committed Oct 14, 2005
1 parent 51e8513 commit 688cb30
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