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Subject: Re: use generic DMA mapping code in powerpc V4
To: Michael Ellerman <mpe@ellerman.id.au>, Christoph Hellwig <hch@lst.de>,
 Benjamin Herrenschmidt <benh@kernel.crashing.org>,
 Paul Mackerras <paulus@samba.org>
References: <20181114082314.8965-1-hch@lst.de> <20181127074253.GB30186@lst.de>
 <87zhttfonk.fsf@concordia.ellerman.id.au>
From: Christian Zigotzky <chzigotzky@xenosoft.de>
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Date: Thu, 29 Nov 2018 13:05:23 +0100
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On 28 November 2018 at 12:05PM, Michael Ellerman wrote:
> Christoph Hellwig <hch@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