use generic DMA mapping code in powerpc V4

[Christian Zigotzky]

On 29 November 2018 at 1:05PM, Christian Zigotzky wrote:
> On 28 November 2018 at 12:05PM, Michael Ellerman wrote:
>> Christoph Hellwig <hch at lst.de> writes:
>>
>>> Any comments?  I'd like to at least get the ball moving on the easy
>>> bits.
>> Nothing specific yet.
>>
>> I'm a bit worried it might break one of the many old obscure platforms
>> we have that aren't well tested.
>>
>> There's not much we can do about that, but I'll just try and test it on
>> everything I can find.
>>
>> Is the plan that you take these via the dma-mapping tree or that they go
>> via powerpc?
>>
>> cheers
>>
> Hi All,
>
> I compiled a test kernel from the following Git today.
>
> http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/powerpc-dma.4 
>
>
> Command: git clone git://git.infradead.org/users/hch/misc.git -b 
> powerpc-dma.4 a
>
> Unfortunately I get some DMA error messages and the PASEMI ethernet 
> doesn't work anymore.
>
> [  367.627623] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
> [  367.627631] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
> [  367.627639] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
> [  367.627647] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
> [  367.627655] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
> [  367.627686] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
> [  367.628418] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
> [  367.628505] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
> [  367.628592] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
> [  367.629324] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
> [  367.629417] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
> [  367.629495] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
> [  367.629589] pci 0000:00:1a.0: dma_direct_map_page: overflow 
> 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
>
> [  430.424732]pasemi_mac: rcmdsta error: 0x04ef3001
>
> I tested this kernel with the Nemo board (CPU: PWRficient PA6T-1682M). 
> The PASEMI ethernet works with the RC4 of kernel 4.20.
>
> Cheers,
> Christian
>
Hi All,

I tested this kernel on my NXP QorIQ P5020 board. U-Boot loads the dtb 
file and the kernel and after that the booting stops. This board works 
with the RC4 of kernel 4.20. Please test this kernel on your NXP and 
PASEMI boards.

Thanks,
Christian