Re: [patch] zero-bounce highmem I/O

[Gerd Knorr]

>  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 ...

  Gerd