Re: (reposting) how to get DMA'able memory within 4GB on 64-bit m achi ne

Alan Cox (alan@lxorguk.ukuu.org.uk)
Fri, 29 Jun 2001 10:56:45 +0100 (BST)

> > as well, when doing large allocs and the IOMMU is full you return a
> > full 64 bit address.
>
> And when the IOMMU is "full" what happens to all the SAC only
> cards in the machine? pci_map_{single,sg}() are not allowed
> to fail.

Thats something we already know has to be fixed. Its true with or without
an IOMMU that there may be cases where there is no free mapping space

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