linux-kernel - Re: use generic DMA mapping code in powerpc V4

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Date:   Wed, 5 Dec 2018 10:44:05 +0100
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Christoph Hellwig <hch@....de>
Cc:     linux-arch@...r.kernel.org,
        Darren Stevens <darren@...vens-zone.net>,
        linux-kernel@...r.kernel.org, Julian Margetson <runaway@...dw.ms>,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Paul Mackerras <paulus@...ba.org>,
        Olof Johansson <olof@...om.net>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: use generic DMA mapping code in powerpc V4

On 04 December 2018 at 3:24PM, Christoph Hellwig wrote:
> On Tue, Dec 04, 2018 at 10:53:39AM +0100, Christian Zigotzky wrote:
>> I don't know why this kernel doesn't recognize the hard disks connected to
>> my physical P5020 board and why the onboard ethernet on my PASEMI board
>> doesn't work. (dma_direct_map_page: overflow)
> Do you know if this actually works for the baseline before my patches?
> E.g. with commit 721c01ba8b46ddb5355bd6e6b3bbfdabfdf01e97 ?
>
Hi Christoph,

Thanks for your reply. I undid all dma mapping commits with the 
following command:

git checkout 721c01ba8b46ddb5355bd6e6b3bbfdabfdf01e97

After that I compiled the kernels with this code for my P5020 board 
(Cyrus) and for my PASEMI board (Nemo) today.

Result: PASEMI onboard ethernet works again and the P5020 board boots.

It seems the dma mapping commits are the problem.

@All
Could you please test Christoph's kernel on your PASEMI and NXP boards? 
Download:

'git clone git://git.infradead.org/users/hch/misc.git -b powerpc-dma.5 a'

Thanks,
Christian