linux-kernel - Re: [PATCH v6 10/11] powerpc/pseries/iommu: Make use of DDW for indirect mapping

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Date:   Fri, 27 Aug 2021 14:53:47 -0300
From:   Leonardo Brás <leobras.c@...il.com>
To:     Frederic Barrat <fbarrat@...ux.ibm.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        kernel test robot <lkp@...el.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 10/11] powerpc/pseries/iommu: Make use of DDW for
 indirect mapping

Hello Fred,

On Fri, 2021-08-27 at 19:06 +0200, Frederic Barrat wrote:
> 
> I think it looks ok now as it was mostly me who was misunderstanding
> one 
> part of the previous iteration.
> Reviewed-by: Frederic Barrat <fbarrat@...ux.ibm.com>
> 

Thank you for reviewing this series!

> Sorry for the late review, I was enjoying some time off. And thanks
> for 
> that series, I believe it should help with those bugs complaining
> about 
> lack of DMA space. It was also very educational for me, thanks to you
> and Alexey for your detailed answers.

Working on this series caused me to learn a lot about how DMA and IOMMU
works in Power, and it was a great experience. Thanks to Alexey who
helped and guided me through this!

Best regards,
Leonardo Bras