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SubjectRe: [patch] zero-bounce highmem I/O
>  What if my scsi controller's pci DMA mask is 0x7fffffff or something
> like this? You don't know at the generic layer, and you must provide
> some way for the block device to indicate stuff like this to you.

While we are at it: Is there some portable way to figure whenever I can
do a PCI DMA transfer to some page? On ia32 I can simply look at the
physical address and if it is behind 4G it doesn't work for 32bit PCI
devices. But I think that is not true for architectures which have a
iommu ...


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