> > > static u64 ipath_dma_map_page(struct ib_device *dev,
> > > struct page *page,
> > > unsigned long offset,
> > > size_t size,
> > > enum dma_data_direction direction)
> > > {
> > > u64 addr;
> > >
> > > BUG_ON(!valid_dma_direction(direction));
> > >
> > > if (offset + size > PAGE_SIZE) {
> > > addr = BAD_DMA_ADDRESS;
> > > goto done;
> > > }
> > >
> > > addr = (u64) page_address(page);
> > > if (addr)
> > > addr += offset;
> > > /* TODO: handle highmem pages */
> > >
> > > done:
> > > return addr;
> > > }
> >
>
> I got the impression that all supported IB devices support dma-ing
> to/from memory > 4GB. Perhaps other vendors can comment.
I think it's true. The only reason ipath doesn't support this at the moment,
is because the maintainer doesn't seem to care about
supporting 32 bit systems.
--
MST
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