2022-07-28 at 10:39, Tudor.Ambarus@microchip.com wrote:

On 7/28/22 10:45, Tudor.Ambarus@microchip.com wrote:

quoted

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On 7/13/22 19:01, Tudor.Ambarus@microchip.com wrote:

quoted

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Hi, Peter,

Thanks for the patience. I was still out of office last week,
but now I have some news.

On 6/27/22 19:53, Tudor.Ambarus@microchip.com wrote:

quoted

I think these are the last less invasive
changes that I try, I'll have to rewrite the logic anyway.

I've chopped the driver to use virt-dma (check [1]). It's not clean, but
it works and one can see how the logic is changed. Unfortunately the mem
corruption is still present on high loads. Maybe it's a coherency problem.
I need more time on it. Will get back to you.

Cheers,
ta

[1] To github.com:ambarus/linux-0day.git
   a7351e6f4c12..1557e0df0fd0  at-hdmac-virt-dma -> at-hdmac-virt-dma

Hi, Peter,

Does this [1] one line patch solve the mem corruption on your side?
Even if yes, there are still bugs in at-hdmac that can be squashed by
using virt-dma. I'd like to follow up with patches that integrate
virt-dma logic in at-hdmac.

Cheers,
ta

[1] https://lore.kernel.org/linux-mtd/20220728074014.145406-1-tudor.ambarus@microchip.com/T/#u (local)

Hi, Peter,

Looks like I've already caught an oops in at-hdmac driver when not using virt-dma,
see below. Would you please test with all the patches from [2] instead of just
using the patch from [1]? I've run stress tests over night by using [2] and
everything went fine on my side.

Cheers,
ta

[2] To github.com:ambarus/linux-0day.git
 * [new branch]                at-hdmac-virt-dma-2nd-iteration -> at-hdmac-virt-dma-2nd-iteration

Hi Tudor,

This last one feels very promising! It's been running for a few hours without
incidents, so even if it isn't fixed it's several magnitudes better.

I'll leave it running for the night. Fingers crossed...

Cheers,
Peter

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