From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Subject: Re: use generic DMA mapping code in powerpc V4
Date: Sat, 19 Jan 2019 15:04:52 +0100
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To: Christian Zigotzky <chzigotzky-KCoaydhb8eAb1SvskN2V4Q@public.gmane.org>
Cc: linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Darren Stevens <darren-YHtdit1eIT3easaKlIn9Lw@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Julian Margetson <runaway-zqC88Q5qmK4@public.gmane.org>, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Paul Mackerras <paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>, linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
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On Sat, Jan 19, 2019 at 02:02:22PM +0100, Christoph Hellwig wrote:
> Interesting.  This suggest it is related to the use of ZONE_DMA by
> the FSL SOCs that your board uses.  Let me investigate this a bit more.

As a hack to check that theory I've pushed a new commit to the
powerpc-dma.6-debug branch to use old powerpc GFP_DMA selection
with the new dma direct code:

http://git.infradead.org/users/hch/misc.git/commitdiff/5c532d07c2f3c3972104de505d06b8d85f403f06

And another one that drops the addressability checks that powerpc
never had:

http://git.infradead.org/users/hch/misc.git/commitdiff/18e7629b38465ca98f8e7eed639123a13ac3b669

Can you first test with both patches, and then just with the first
in case that worked?