linux-kernel - Re: Regression: memory corruption on Atmel SAMA5D31

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Message-ID: <684f7262-13e0-f519-ffee-bbdb3ed80717@microchip.com>
Date:   Thu, 28 Jul 2022 07:45:13 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <peda@...ntia.se>, <regressions@...mhuis.info>,
        <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>
CC:     <du@...ntia.se>, <Patrice.Vilchez@...rochip.com>,
        <Cristian.Birsan@...rochip.com>, <Ludovic.Desroches@...rochip.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <gregkh@...uxfoundation.org>, <saravanak@...gle.com>,
        <dmaengine@...r.kernel.org>
Subject: Re: Regression: memory corruption on Atmel SAMA5D31

On 7/13/22 19:01, Tudor.Ambarus@...rochip.com wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> 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@...rochip.com wrote:
>> 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