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Date:   Sat, 19 Jan 2019 15:04:52 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Christian Zigotzky <chzigotzky@xenosoft.de>
Cc:     Christoph Hellwig <hch@lst.de>, linux-arch@vger.kernel.org,
        Darren Stevens <darren@stevens-zone.net>,
        linux-kernel@vger.kernel.org, Julian Margetson <runaway@candw.ms>,
        linux-mm@kvack.org, iommu@lists.linux-foundation.org,
        Paul Mackerras <paulus@samba.org>,
        Olof Johansson <olof@lixom.net>, linuxppc-dev@lists.ozlabs.org
Subject: Re: use generic DMA mapping code in powerpc V4
Message-ID: <20190119140452.GA25198@lst.de>
References: <871403f2-fa7d-de15-89eb-070432e15c69@xenosoft.de> <20190118112842.GA9115@lst.de> <a2ca0118-5915-8b1c-7cfa-71cb4b43eaa6@xenosoft.de> <20190118121810.GA13327@lst.de> <eceebeda-0e18-00f6-06e7-def2eb0aa961@xenosoft.de> <20190118125500.GA15657@lst.de> <e11e61b1-6468-122e-fc2b-3b3f857186bb@xenosoft.de> <f39d4fc6-7e4e-9132-c03f-59f1b52260e0@xenosoft.de> <b9e5e081-a3cc-2625-4e08-2d55c2ba224b@xenosoft.de> <20190119130222.GA24346@lst.de>
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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?