linux-kernel - Re: [PATCH 07/28] 53c700: improve non-coherent DMA handling

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Date:   Tue, 1 Sep 2020 18:21:58 +0200
From:   Helge Deller <deller@....de>
To:     James Bottomley <James.Bottomley@...senPartnership.com>,
        Matthew Wilcox <willy@...radead.org>
Cc:     Christoph Hellwig <hch@....de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Pawel Osciak <pawel@...iak.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Matt Porter <mporter@...nel.crashing.org>,
        iommu@...ts.linux-foundation.org,
        Tom Lendacky <thomas.lendacky@....com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-ia64@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        nouveau@...ts.freedesktop.org, netdev@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org,
        linux-mm@...ck.org, alsa-devel@...a-project.org
Subject: Re: [PATCH 07/28] 53c700: improve non-coherent DMA handling

On 01.09.20 17:22, James Bottomley wrote:
> On Tue, 2020-09-01 at 16:05 +0100, Matthew Wilcox wrote:
>> On Tue, Sep 01, 2020 at 07:52:40AM -0700, James Bottomley wrote:
>>> I think this looks mostly OK, except for one misnamed parameter
>>> below. Unfortunately, the last non-coherent parisc was the 700
>>> series and I no longer own a box, so I can't test that part of it
>>> (I can fire up the C360 to test it on a coherent arch).
>>
>> I have a 715/50 that probably hasn't been powered on in 15 years if
>> you need something that old to test on (I believe the 725/100 uses
>> the 7100LC and so is coherent).  I'll need to set up a cross-compiler
>> ...
>
> I'm not going to say no to actual testing, but it's going to be a world
> of pain getting something so old going.  I do have a box of older
> systems I keep for architectural testing that I need to rummage around
> in ... I just have a vague memory that my 715 actually caught fire a
> decade ago and had to be disposed of.

I still have a zoo of machines running for such testing, including a
715/64 and two 730.
I'm going to test this git tree on the 715/64:
git://git.infradead.org/users/hch/misc.git dma_alloc_pages

Helge