Re: problem with blk_queue_bounce_limit()

David Mosberger (
Fri, 6 Jun 2003 00:19:08 -0700

>>>>> On Thu, 05 Jun 2003 23:52:49 -0700 (PDT), "David S. Miller" <> said:

David> you're not setting PCI_DMA_BUS_IS_PHYS properly. For IOMMU
David> it should be set to zero. This tells the block layer if
David> you're IOMMU or not.

Ah, yes, thanks for pointing this out.

PCI_DMA_BUS_IS_PHYS (and it's description) is quite misleading: it
claims that it has something to do with there being an equivalence
between PCI bus and physical addresses. That's actually the case for
(small) ia64 platforms so that's why we ended up setting it to 1.

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