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

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Date:   Wed, 6 Feb 2019 16:15:05 +0100
From:   Christoph Hellwig <hch@....de>
To:     Christian Zigotzky <chzigotzky@...osoft.de>
Cc:     Christoph Hellwig <hch@....de>, Olof Johansson <olof@...om.net>,
        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>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: use generic DMA mapping code in powerpc V4

On Wed, Feb 06, 2019 at 02:45:34PM +0100, Christian Zigotzky wrote:
> I patched the source code from the Git 'powerpc-dma.6' with your patch 
> today. Unfortunately the P.A. Semi Ethernet doesn't work with the patched 
> Git kernel.
>
> After that I tried it with the patch applied over the working setup again 
> (powerpc/dma: use the dma_direct mapping routines). Unfortunately after 
> compiling
> and booting, the P.A. Semi Ethernet doesn't work either.

The last good one was 29e7e2287e196f48fe5d2a6e017617723ea979bf
("dma-direct: we might need GFP_DMA for 32-bit dma masks"), if I
remember correctly.  powerpc/dma: use the dma_direct mapping routines
was the one that you said makes the pasemi ethernet stop working.

Can you post the dmesg from the failing runs?