From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Subject: Re: [PATCH 03/14] x86: use dma-direct
Date: Thu, 15 Mar 2018 14:40:28 +0100
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To: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Cc: Tom Lendacky <thomas.lendacky-5C7GfCeVMHo@public.gmane.org>, Konrad Rzeszutek Wilk <konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Muli Ben-Yehuda <mulix-BzGcCpaT2IbYtjvyW6yDsg@public.gmane.org>, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>, Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
List-Id: iommu@lists.linux-foundation.org

On Thu, Mar 15, 2018 at 01:53:52PM +0100, Thomas Gleixner wrote:
> > > > The generic dma-direct implementation is now functionally equivalent to
> > > > the x86 nommu dma_map implementation, so switch over to using it.
> > > 
> > > Can you please convert the various drivers first and then remove the
> > > unused code?
> > 
> > Which various drivers?
> > 
> > > > Note that the various iommu drivers are switched from x86_dma_supported
> 
> The various iommu drivers ....

It doesn't really make any sense to switch them separately.  They've
inherited the ops from x86 which used to override it on an arch level,
and we've now generalized the exactly same implementation to common code.