use generic DMA mapping code in powerpc V4

[Darren Stevens]

Hello Christoph

On 08/02/2019, Christoph Hellwig wrote:
> On Fri, Feb 08, 2019 at 10:01:46AM +0100, Christian Zigotzky wrote:
>> Hi Christoph,
>>
>> Your new patch fixes the problems with the P.A. Semi Ethernet! :-)
>
> Thanks a lot once again for testing!
>
> Now can you test with this patch and the whole series?
>
> I've updated the powerpc-dma.6 branch to include this fix.

Update: I found the following in my dmesg, think it points to an of-by-one error in the pfn selection:

Feb  9 19:47:00 Cyrus kernel: [    0.000000] Top of RAM: 0x200000000, Total RAM: 0x200000000
Feb  9 19:47:00 Cyrus kernel: [    0.000000] Memory hole size: 0MB
Feb  9 19:47:00 Cyrus kernel: [    0.000000] Zone ranges:
Feb  9 19:47:00 Cyrus kernel: [    0.000000]   DMA      [mem 0x0000000000000000-0x000000007fffefff]
Feb  9 19:47:00 Cyrus kernel: [    0.000000]   Normal   [mem 0x000000007ffff000-0x00000001ffffffff]

I had a quick look but couldn't see where though.

Regards
Darren