Re: use generic DMA mapping code in powerpc V4

From: Christian Zigotzky
Date: Thu Nov 29 2018 - 10:30:30 EST


On 29 November 2018 at 1:05PM, Christian Zigotzky wrote:
On 28 November 2018 at 12:05PM, Michael Ellerman wrote:
Christoph Hellwig <hch@xxxxxx> 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.

[Â 367.627623] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
[Â 367.627631] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
[Â 367.627639] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
[Â 367.627647] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
[Â 367.627655] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
[Â 367.627686] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
[Â 367.628418] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
[Â 367.628505] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
[Â 367.628592] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
[Â 367.629324] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
[Â 367.629417] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
[Â 367.629495] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0
[Â 367.629589] pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0

[Â 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