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

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Date:   Thu, 17 Jan 2019 10:21:11 +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

Hi All,

I compiled the fixed '257002094bc5935dd63207a380d9698ab81f0775' 
(powerpc/dma: use the dma-direct allocator for coherent platforms) today.

git clone git://git.infradead.org/users/hch/misc.git -b powerpc-dma.6 a

git checkout 257002094bc5935dd63207a380d9698ab81f0775

Link to the Git: 
http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/powerpc-dma.6 

env LANG=C make CROSS_COMPILE=powerpc-linux-gnu- ARCH=powerpc zImage

env LANG=C make CROSS_COMPILE=powerpc-linux-gnu- ARCH=powerpc uImage

The X1000 boots and the PASEMI onboard ethernet works!

Bad news for the X5000 (P5020 board). U-Boot loads the kernel and the 
dtb file. Then the kernel starts but it doesn't find any hard disks 
(partitions).

Cheers,
Christian

On 15 January 2019 at 4:17PM, Christoph Hellwig wrote:

So 257002094bc5935dd63207a380d9698ab81f0775 above is the fixed version
for the commit - this switched the ifdef in dma.c around that I had
inverted.  Can you try that one instead?  And then move on with the
commits after it in the updated powerpc-dma.6 branch - they are
identical to the original branch except for carrying this fix forward.