linux-kernel - Re: [PATCH 5/6] driver core: lift dma_default

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Message-ID: <alpine.DEB.2.21.2102091213070.35623@angie.orcam.me.uk>
Date:   Tue, 9 Feb 2021 12:23:11 +0100 (CET)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Christoph Hellwig <hch@....de>
cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 5/6] driver core: lift dma_default_coherent into common
 code

On Mon, 8 Feb 2021, Christoph Hellwig wrote:

> >  Do you need to have this verified anyhow?  I only have a non-coherent 5Kc 
> > Malta though.
> 
> If you get a chance to test this logic, that would be great.

 I'll try to give it a hit in the next few days then.  Installed in my 
Malta I have a DEFPA, which is about as serious a DMA user as a piece of 
classic PCI hardware could be.  I need to debug the issue of another DEFPA 
not working with my POWER9 system, possibly due to an IOMMU handling bug 
(hopefully not broken host hardware), so I'll take the opportunity and do 
it all at once.

  Maciej