On Feb 8, 2009, at 2:54 PM, Warner Losh wrote:
Author: imp
Date: Sun Feb 8 22:54:58 2009
New Revision: 188350
URL: http://svn.freebsd.org/changeset/base/188350
Log:
When bouncing pages, allow a new option to preserve the intra-page
offset. This is needed for the ehci hardware buffer rings that
assume
this behavior.
I thought we ended up with always doing that?
Bounce buffers may or may not be used, so if the page offset
must be zero for bounce buffers, they must be zero for the
original DMA request. I see no value in re-aligning the DMA
request to a page boundary when bounce buffers are used, but
it is required in some cases to not realign. Hence, why not
always (and unconditionally) preserve the alignment?
--
Marcel Moolenaar
xcl...@mac.com
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