linux-kernel - Re: [BUG sparc64] 2.6.22-rc broke X on Ultra5

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Message-Id: <200706070624.l576Ovbd008665@harpo.it.uu.se>
Date:	Thu, 7 Jun 2007 08:24:57 +0200 (MEST)
From:	Mikael Pettersson <mikpe@...uu.se>
To:	davem@...emloft.net, mikpe@...uu.se
Cc:	linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: [BUG sparc64] 2.6.22-rc broke X on Ultra5

On Wed, 06 Jun 2007 16:22:10 -0700 (PDT), David Miller <davem@...emloft.net> wrote:
> > From: Mikael Pettersson <mikpe@...uu.se>
> > Date: Wed, 30 May 2007 21:33:18 +0200 (MEST)
> > 
> > > You were spot on. 2.6.21 + patches up to but not including
> > > the first one above works. Adding that one gave me a kernel
> > > that wouldn't boot (hung after "uncompressing kernel").
> > > Adding the second one above gave me a kernel that booted, but
> > > where X failed to mmap() the frame buffer as I described.
> > 
> > Thanks for all of your testing.
> > 
> > I'll try to figure this out on one of my Ultra5's here.
> 
> So I did some more digging, got my ultra5 running and I can't
> get it to work with both 2.6.20 and 2.6.22-rc4 :-)  This is
> with xorg-7.2, and they both fail with:
> 
> xf86MapPciMem: Could not mmap ...
> 
> which I assume is the error you're seeing.

With 2.6.21 + the broken patches, yes. With 2.6.22-rc I got
a slightly different message which still said something about
a PCI mmap failure.

BTW, I have xorg-6.8.1 (Aurora 2.0 user-space), which might
explain why we see different behaviour.

> Investigation reveals that X.org is erroneously trying to
> do PCI mmap ioctl()'s on /sys/bus/pci/devices/*/config
> files which is very very wrong.  Again this happens for me
> with both 2.6.20 and 2.6.22
> 
> Can you just quickly strace "Xorg" startup in the working
> and non-working case?  Just a simple:
> 
> 	strace -o x.log Xorg
> 
> would for both cases be fine.
> 
> You can email it to me privately, and I'll post here my
> analysis with the relevant portions quoted so we don't
> flood the list with strace dumps :-)

I'm away from my ultra5 right now, but I should be able to do
this test on Monday next week. 

/Mikael
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