linux-kernel - Re: use generic DMA mapping code in powerpc V4

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Date:   Thu, 29 Nov 2018 13:05:23 +0100
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Christoph Hellwig <hch@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-arch@...r.kernel.org, linux-mm@...ck.org,
        iommu@...ts.linux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Olof Johansson <olof@...om.net>
Subject: Re: use generic DMA mapping code in powerpc V4

On 28 November 2018 at 12:05PM, Michael Ellerman wrote:
> Christoph Hellwig <hch@....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