linux-kernel - Re: Interacting with coherent memory on external devices

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Message-ID: <alpine.DEB.2.11.1504241051090.9889@gentwo.org>
Date:	Fri, 24 Apr 2015 10:52:03 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	Austin S Hemmelgarn <ahferroin7@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jerome Glisse <j.glisse@...il.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	jglisse@...hat.com, mgorman@...e.de, aarcange@...hat.com,
	riel@...hat.com, airlied@...hat.com,
	aneesh.kumar@...ux.vnet.ibm.com,
	Cameron Buschardt <cabuschardt@...dia.com>,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Geoffrey Gerfin <ggerfin@...dia.com>,
	John McKenna <jmckenna@...dia.com>, akpm@...ux-foundation.org
Subject: Re: Interacting with coherent memory on external devices

On Fri, 24 Apr 2015, Paul E. McKenney wrote:

> > DAX is a mechanism to access memory not managed by the kernel and is the
> > successor to XIP. It just happens to be needed for persistent memory.
> > Fundamentally any driver can provide an MMAPPed interface to allow access
> > to a devices memory.
>
> I will take another look, but others in this thread have called out
> difficulties with DAX's filesystem nature.

Right so you do not need the filesystem structure. Just simply writing a
device driver that mmaps data as needed from the coprocessor will also do
the trick.

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