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

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Date:   Thu, 13 Dec 2018 18:48:38 +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

On 13 December 2018 at 2:34PM, Christian Zigotzky wrote:
> On 13 December 2018 at 12:25PM, Christoph Hellwig wrote:
>> On Thu, Dec 13, 2018 at 12:19:26PM +0100, Christian Zigotzky wrote:
>>> I tried it again but I get the following error message:
>>>
>>> MODPOST vmlinux.o
>>> arch/powerpc/kernel/dma-iommu.o: In function 
>>> `.dma_iommu_get_required_mask':
>>> (.text+0x274): undefined reference to `.dma_direct_get_required_mask'
>>> make: *** [vmlinux] Error 1
>> Sorry, you need this one liner before all the patches posted last time:
>>
>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
>> index d8819e3a1eb1..7e78c2798f2f 100644
>> --- a/arch/powerpc/Kconfig
>> +++ b/arch/powerpc/Kconfig
>> @@ -154,6 +154,7 @@ config PPC
>>       select CLONE_BACKWARDS
>>       select DCACHE_WORD_ACCESS        if PPC64 && CPU_LITTLE_ENDIAN
>>       select DYNAMIC_FTRACE            if FUNCTION_TRACER
>> +    select DMA_DIRECT_OPS
>>       select EDAC_ATOMIC_SCRUB
>>       select EDAC_SUPPORT
>>       select GENERIC_ATOMIC64            if PPC32
>>
> Thanks. Result: PASEMI onboard ethernet works and the X5000 (P5020 
> board) boots with the patch '0001-get_required_mask.patch'.
>
> -- Christian
>
>
Next patch: '0002-swiotlb-dma_supported.patch' for the last good commit 
(977706f9755d2d697aa6f45b4f9f0e07516efeda).

The PASEMI onboard ethernet works and the X5000 (P5020 board) boots.

-- Christian