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: <20191204085634.GA25929@lst.de>
Date:   Wed, 4 Dec 2019 09:56:34 +0100
From:   Christoph Hellwig <hch@....de>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     Christoph Hellwig <hch@....de>,
        Christian Zigotzky <chzigotzky@...osoft.de>,
        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 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.