use generic DMA mapping code in powerpc V4

[Christian Zigotzky]

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