linux-kernel - Re: [Linaro-mm-sig] [RFCv3 2/2] dma-buf: add helpers for sharing attacher constraints with dma-parms

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Message-ID: <19028710.jGRCggLuRk@wuerfel>
Date:	Tue, 03 Feb 2015 22:44:53 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linaro-kernel@...ts.linaro.org
Cc:	Rob Clark <robdclark@...il.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Tomasz Stanislawski <stanislawski.tomasz@...glemail.com>,
	LKML <linux-kernel@...r.kernel.org>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	"linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Daniel Vetter <daniel@...ll.ch>,
	Robin Murphy <robin.murphy@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>
Subject: Re: [Linaro-mm-sig] [RFCv3 2/2] dma-buf: add helpers for sharing attacher constraints with dma-parms

On Tuesday 03 February 2015 12:35:34 Rob Clark wrote:
> 
> I can't think of cases outside of GPU's..  if it were more common I'd
> be in favor of teaching dma api about multiple contexts, but right now
> I think that would just amount to forcing a lot of churn on everyone
> else for the benefit of GPU's.

We have a couple of users of the iommu API at the moment outside of
GPUs:

* drivers/media/platform/omap3isp/isp.c
* drivers/remoteproc/remoteproc_core.c
* drivers/infiniband/hw/usnic/usnic_uiom.c
* drivers/vfio/

I assume we will see a few more over time. The vfio case is the most
important one here, since that is what the iommu API was designed for.

	Arnd
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