linux-kernel - Re: [git pull] drm fixes + agp + one fb patch (bisected)

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Date:	Wed, 30 Jun 2010 11:34:53 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	Dave Airlie <airlied@...ux.ie>, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, dri-devel@...ts.sf.net
Subject: Re: [git pull] drm fixes + agp + one fb patch (bisected)

On Wed, Jun 30, 2010 at 11:14 AM, Markus Trippelsdorf
<markus@...ppelsdorf.de> wrote:
> On Wed, Jun 30, 2010 at 11:03:33AM -0400, Alex Deucher wrote:
>> On Wed, Jun 30, 2010 at 10:58 AM, Markus Trippelsdorf
>> <markus@...ppelsdorf.de> wrote:
>> > On Wed, Jun 30, 2010 at 10:49:41AM -0400, Alex Deucher wrote:
>> >> On Wed, Jun 30, 2010 at 3:31 AM, Markus Trippelsdorf
>> >> <markus@...ppelsdorf.de> wrote:
>> >> > On Wed, Jun 30, 2010 at 08:54:40AM +0200, Markus Trippelsdorf wrote:
>> >> >> On Wed, Jun 30, 2010 at 02:03:04AM +0100, Dave Airlie wrote:
>> >> >> >
>> >> >> > one fb layer fix in a flag I introduced,
>> >> >> >
>> >> >> > the rest are drm fixes:
>> >> >> > radeon fixes: the larger ones in the command stream checker for older cards,
>> >> >> > which was causing a lot of userspace apps to fail. Also some powerpc server fixes.
>> >> >> > along with some updates to the evergreen command stream checker introduced in -rc1.
>> >> >> >
>> >> >> > agp: fix issue with warning on memory allocation + fallback to vmalloc.
>> >> >> > ttm: fix regression introduced in -rc1 in memory allocation paths.
>> >> >> >
>> >> >> > The following changes since commit 7e27d6e778cd87b6f2415515d7127eba53fe5d02:
>> >> >> >
>> >> >> >   Linux 2.6.35-rc3 (2010-06-11 19:14:04 -0700)
>> >> >> >
>> >> >>
>> >> >> I've tested these patches and they break my setup (RS780). On reboot, the
>> >> >> monitor goes straight to powersaving mode and no framebuffer is shown.
>> >> >
>> >> > This is the result of the bisection:
>> >> >
>> >> > 07d4190327b02ab3aaad25a2d168f79d92e8f8c2 is the first bad commit
>> >> > commit 07d4190327b02ab3aaad25a2d168f79d92e8f8c2
>> >> > Author: Alex Deucher <alexdeucher@...il.com>
>> >> > Date:   Sat Jun 12 11:50:13 2010 -0400
>> >> >
>> >> >    drm/radeon/kms: fix bandwidth calculation when sideport is present
>> >> >
>> >> >    Fixes fdo bug 27529:
>> >> >    https://bugs.freedesktop.org/show_bug.cgi?id=27529
>> >> >
>> >> >    Reported-by: steckdenis@...oo.fr
>> >> >    Signed-off-by: Alex Deucher <alexdeucher@...il.com>
>> >> >    Cc: stable <stable@...nel.org>
>> >> >    Signed-off-by: Dave Airlie <airlied@...hat.com>
>> >>
>> >> Markus, can you send me a copy of your vbios? as root:
>> >> cd /sys/bus/pci/devices/<pci bus id of video card>
>> >> echo 1 > rom
>> >> cat rom ? /tmp/vbio.rom
>> >> echo 0 > rom
>> >
>> > Attached.
>> >
>> >>
>> >> Also, when you say "on reboot" do you mean the card comes up ok
>> >> initially with the new kernel and then fails after a reboot, or fails
>> >> directly after booting the new kernel?  Also, is there an oops or
>> >> anything like that in dmesg?
>> >
>> > It fails directly after booting the new kernel. There is no oops or
>> > anything like it in dmesg, because the kernel fails so early that it
>> > could not log anything.
>>
>> Is the machine still pingable?  Can you ssh in? or is it completely dead?
>
> I don't think so. There is no disk activivy after the hang, but maybe
> the kernel displays an oops, which I just can't see.

The attached patch should fix the issue.

Alex

View attachment "0001-drm-radeon-kms-igp-fix-possible-divide-by-0-in-bandw.patch" of type "text/x-patch" (4135 bytes)