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

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Message-ID: <bfe4adcc-01c1-7b46-f40a-8e020ff77f58@xenosoft.de>
Date:   Mon, 21 Jan 2019 15:38:38 +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

Hello Christoph,

Thanks for your reply. I successfully compiled a kernel (uImage) for the 
X5000 from your Git 'powerpc-dma.6-debug' (both patches) today.

It detects the SATA hard disk drive and boots without any problems. I 
will test the first patch in next days.

Thanks for your help,

Christian


On 19 January 2019 at 3:04PM, Christoph Hellwig wrote:
> 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?
>
>