[openib-general] IB/ipath - Implement new verbs DMA mapping functions

[Roland Dreier]

 > This is a bug since there are architectures eg PPC64 where the native
 > address size is u64 but dma_addr_t is u32. You are somehow in a
 > problem here, since returning an unchopped cpu_addr to the consumer
 > might cause a memory corruption as they are expecting 32 bit value.

Yes (although ppc64 is now u64 -- sparc64 is still u32 though).  I
think this means we need to make these ib_dma_xxx functions return u64
instead of dma_addr_t.

 - R.