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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Date:   Wed, 4 Dec 2019 13:22:01 +0100
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Christoph Hellwig <hch@....de>
Cc:     Mike Rapoport <rppt@...ux.ibm.com>,
        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

I think we have to wait to Roland’s test results with his SCSI PCI card.

Christian

Sent from my iPhone

> On 4. Dec 2019, at 09:56, Christoph Hellwig <hch@....de> wrote:
> 
>> On Wed, Nov 27, 2019 at 08:56:25AM +0200, Mike Rapoport wrote:
>>> On Tue, Nov 26, 2019 at 05:40:26PM +0100, Christoph Hellwig wrote:
>>>> On Tue, Nov 26, 2019 at 12:26:38PM +0100, Christian Zigotzky wrote:
>>>> Hello Christoph,
>>>> 
>>>> The PCI TV card works with your patch! I was able to patch your Git kernel 
>>>> with the patch above.
>>>> 
>>>> I haven't found any error messages in the dmesg yet.
>>> 
>>> Thanks.  Unfortunately this is a bit of a hack as we need to set
>>> the mask based on runtime information like the magic FSL PCIe window.
>>> Let me try to draft something better up, and thanks already for testing
>>> this one!
>> 
>> Maybe we'll simply force bottom up allocation before calling
>> swiotlb_init()? Anyway, it's the last memblock allocation.
> 
> So I think we should go with this fix (plus a source code comment) for
> now.  Revamping the whole memory initialization is going to take a
> while, and this fix also is easily backportable.