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

From: Gerd Knorr (kraxel@bytesex.org)
Date: Thu Aug 16 2001 - 07:14:40 EST


> 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

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This archive was generated by hypermail 2b29 : Thu Aug 23 2001 - 21:00:15 EST