On 28 November 2018 at 12:05PM, Michael Ellerman wrote:

Christoph Hellwig [off-list ref] writes:

quoted

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