On Sat, Sep 08, 2007 at 07:32:27AM -0400, Jeff Garzik wrote:

FUJITA Tomonori wrote:

quoted

Yeah, iommu code ignores the lld limitations (the problem is that the
lld limitations are in request_queue and iommu code can't access to
request_queue). There is no way to tell iommu code about the lld
limitations.

This fact very much wants fixing.

Absolutely.  Unfortunately everyone wastes their time on creating workarounds
instead of fixing the underlying problem.