svn commit: r310330 - in head: share/man/man4 sys/conf sys/dev/xdma

[Ruslan Bukin]

On Tue, Dec 20, 2016 at 12:50:11PM -0800, John Baldwin wrote:
> On Tuesday, December 20, 2016 06:02:07 PM Ruslan Bukin wrote:
> > Author: br
> > Date: Tue Dec 20 18:02:07 2016
> > New Revision: 310330
> > URL: https://svnweb.freebsd.org/changeset/base/310330
> > 
> > Log:
> >   Add xDMA -- the DMA abstraction layer, initial verison.
> >   
> >   xDMA is a DMA framework designed to abstract the interaction
> >   between device drivers and DMA engines.
> >   
> >   Project wiki: https://wiki.freebsd.org/xdma
> >   
> >   Sponsored by:	DARPA, AFRL
> >   Differential Revision:	https://reviews.freebsd.org/D8807
> 
> It probably would have been a good idea to get some design review of this on
> arch@ before committing.  In particular, I believe from earlier discussions
> that you want to build a general framework that things like ioat(4) can hook
> into.  arch@ would give you a broader audience for working out the
> abstractions and interfaces.
> 

Yep, you probably right. I found lack of interest from the list of reviewers
I added on phabricator, so decided to go, but may be list was not 100%
pervasive.

Anyway it is just 673 lines of code and I continue working on it.
I plan to add scatter-gathering type of transfer and SoftDMA(®) driver,
so any review of this or upcoming changes would be appreciated.

Ruslan