Kernel 5.0

[xeno74]

Hi All,

The kernel developers want to use the generic DMA mapping code for PowerPC machines. They modified the source code for testing. Maybe they want to add it to the kernel 4.21. I compiled a test kernel with this DMA code today. You can get it via the following Git:

http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/powerpc-dma.4

Command:

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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 on my X1000 anymore.

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[  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


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[  430.424732]pasemi_mac: rcmdsta error: 0x04ef3001

Unfortunately the X5000 doesn't boot. U-Boot loads the dtb file and the kernel and after that the booting stops.

Cheers,
Christian

[xeno74]

I reported these issues with the PASEMI ethernet and the X5000 to the kernel developers: use generic DMA mapping code in powerpc V4

[xeno74]

Hi All,

A PowerMac G5 has also problems with the new DMA mapping code.

Link to the test thread: use generic DMA mapping code in powerpc V4

Hi, Christoph,

I'm sorry, but this series makes nouveau my Power Mac G5 very unhappy.
Dmesg and .config attached.
Let me know if you need anything else to help you debug this, I'm
happy to help with testing.

Thanks,
Rui

Cheers,
Christian

[xeno74]

Hi All,

Christoph has released a patch for the X5000. I patched his Git kernel and after that I compiled it again. U-Boot loads the kernel and the dtb file. Then the kernel starts
but it doesn't find any hard disks (partitions).
Unfortunately he hasn't had an idea because of the PASEMI ethernet yet. I reported him the PASEMI ethernet issues from the past. I hope it helps him to fix the issue.

Link to the test thread: use generic DMA mapping code in powerpc V4

@Darren
Could you please also test Christoph's kernel on your X1000 and X5000? Download:

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git clone git://git.infradead.org/users/hch/misc.git -b powerpc-dma.4 a

*PLEASE*

Thanks,
Christian

[xeno74]

New download:

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git clone git://git.infradead.org/users/hch/misc.git -b powerpc-dma.5 a

Please test it.

[xeno74]

Hi All,

I compiled the version 5 of his Git kernel and tested it today. Unfortunately the PASEMI ethernet doesn't work.

Error message:

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pci 0000:00:1a.0: dma_direct_map_page: overflow 0x000000026bcb5002+110 of device mask ffffffff bus mask 0

I reported the result to Christoph. Link: use generic DMA mapping code in powerpc V4

Cheers,
Christian

[xeno74]

Hi All,

I undid all dma mapping commits with the following command:

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git checkout 721c01ba8b46ddb5355bd6e6b3bbfdabfdf01e97

I would like to figure out if the dma mappings are the problem. I compiled the kernels with this code for the X1000 and X5000 today.

Result: PASEMI onboard ethernet works again and the X5000 boots. It seems the dma mapping commits are the problem.

Cheers,
Christian

[xeno74]

> Thanks for your reply. I undid all dma mapping commits with the following
> command:
>
> git checkout 721c01ba8b46ddb5355bd6e6b3bbfdabfdf01e97
>
> After that I compiled the kernels with this code for my P5020 board (Cyrus)
> and for my PASEMI board (Nemo) today.
>
> Result: PASEMI onboard ethernet works again and the P5020 board boots.
>
> It seems the dma mapping commits are the problem.

Thanks. Can you try a few stepping points in the tree?

First just with commit 7fd3bb05b73beea1f9840b505aa09beb9c75a8c6
(the first one) applied?

Second with all commits up to 5da11e49df21f21dac25a2491aa788307bdacb6b

And if that still works with commits up to
c1bfcad4b0cf38ce5b00f7ad880d3a13484c123a

I undid the commit 7fd3bb05b73beea1f9840b505aa09beb9c75a8c6 with the following command:

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git checkout 7fd3bb05b73beea1f9840b505aa09beb9c75a8c6

Result: PASEMI onboard ethernet works again and the P5020 board boots.

[xeno74]

Today I tested the commit 5da11e49df21f21dac25a2491aa788307bdacb6b.

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git checkout 5da11e49df21f21dac25a2491aa788307bdacb6b

The PASEMI onboard ethernet works and the X5000 boots.

[xeno74]

Next step: 13c1fdec5682b6e13257277fa16aa31f342d167d (powerpc/dma: move pci_dma_dev_setup_swiotlb to fsl_pci.c)

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git checkout 13c1fdec5682b6e13257277fa16aa31f342d167d

Link to the Git: http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/powerpc-dma.5

The PASEMI onboard ethernet works and the X5000 boots.