linux-kernel - Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board installed, unless RAM size limited to 3500M

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Message-ID: <2fde79cf-875f-94e6-4a1b-f73ebb2e2c32@xenosoft.de>
Date:   Sat, 23 Nov 2019 12:42:27 +0100
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Christoph Hellwig <hch@....de>
Cc:     Robin Murphy <robin.murphy@....com>, linux-arch@...r.kernel.org,
        darren@...vens-zone.net, mad skateman <madskateman@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        iommu@...ts.linux-foundation.org, Rob Herring <robh+dt@...nel.org>,
        paulus@...ba.org, rtd2@...a.co.nz,
        "contact@...on.com" <contact@...on.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        nsaenzjulienne@...e.de
Subject: Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board
 installed, unless RAM size limited to 3500M

On 21 November 2019 at 07:02 pm, Christoph Hellwig wrote:
> On Thu, Nov 21, 2019 at 05:34:48PM +0100, Christian Zigotzky wrote:
>> I modified the patch and compiled a new RC8 of kernel 5.4 today. (patch
>> attached)
>>
>> We have to wait to Rolands test results with his SCSI PCI card. I tested it
>> today but my TV card doesn't work with this patch.
> I think we have two sorta overlapping issues here.  One is that I think
> we need the bus_dma_limit, which should mostly help for something like
> a SCSI controller that doesn't need streaming mappings (btw, do we
> have more details on that somewhere?).
>
> And something weird with the videobuf things.  Your change of the dma
> masks suggests that the driver doesn't do the right allocations and thus
> hits bounce buffering (swiotlb).  We should fix that for real, but the
> fact that the bounce buffering itself also fails is even more interesting.
>
> Can you try this git branch:
>
>      git://git.infradead.org/users/hch/misc.git fsl-dma-debugging
>
> Gitweb:
>
>      http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/fsl-dma-debugging
>
> and send me the dmesg with that with your TV adapter?
>
Hello Christoph,

Please find attached the dmesg of your Git kernel.

Thanks,
Christian

View attachment "dmesg_p5040_2019-11-23.txt" of type "text/plain" (55152 bytes)