linux-kernel - Re: [git pull] drm merge for 3.9-rc1

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Date:	Thu, 28 Feb 2013 08:44:07 -0500
From:	Josh Boyer <jwboyer@...il.com>
To:	Alex Deucher <alexdeucher@...il.com>
Cc:	Dave Airlie <airlied@...ux.ie>,
	Alex Deucher <alexander.deucher@....com>,
	Jerome Glisse <jglisse@...hat.com>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	DRI mailing list <dri-devel@...ts.freedesktop.org>
Subject: Re: [git pull] drm merge for 3.9-rc1

On Thu, Feb 28, 2013 at 8:38 AM, Alex Deucher <alexdeucher@...il.com> wrote:
> On Wed, Feb 27, 2013 at 8:14 PM, Josh Boyer <jwboyer@...il.com> wrote:
>> On Wed, Feb 27, 2013 at 7:01 PM, Josh Boyer <jwboyer@...il.com> wrote:
>>> On Wed, Feb 27, 2013 at 3:20 PM, Josh Boyer <jwboyer@...il.com> wrote:
>>>> On Wed, Feb 27, 2013 at 11:34 AM, Josh Boyer <jwboyer@...il.com> wrote:
>>>>> On Mon, Feb 25, 2013 at 7:05 PM, Dave Airlie <airlied@...ux.ie> wrote:
>>>>>> Alex Deucher (29):
>>>>>>       drm/radeon: halt engines before disabling MC (6xx/7xx)
>>>>>>       drm/radeon: halt engines before disabling MC (evergreen)
>>>>>>       drm/radeon: halt engines before disabling MC (cayman/TN)
>>>>>>       drm/radeon: halt engines before disabling MC (si)
>>>>>>       drm/radeon: use the reset mask to determine if rings are hung
>>>>>
>>>>> Something in this series of commits is causing the GPU to hang on reboot
>>>>> on my Dell XPS 8300 machine.  That has a:
>>>>>
>>>>> 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee
>>>>> ATI Caicos [Radeon HD 6450]
>>>>>
>>>>> card in it.  After reboots, I get a screen that looks like this:
>>>>>
>>>>> http://t.co/tPnT6xQZUK
>>>>>
>>>>> I can hit it fairly consistently after a few reboots, so I tried doing a
>>>>> git bisect on the radeon driver and it came down to:
>>>>>
>>>>> ca57802e521de54341efc8a56f70571f79ffac72 is the first bad commit
>>>>
>>>> So I don't think that's actually the cause of the problem.  Or at least
>>>> not that alone.  I reverted it on top of Linus' latest tree and I still
>>>> get the lockups.
>>>
>>> Actually, git bisect does seem to have gotten it correct.  Once I
>>> actually tested the revert of just that on top of Linus' tree (commit
>>> d895cb1af1), things seem to be working much better.  I've rebooted a
>>> dozen times without a lockup.  The most I've seen it take on a kernel
>>> with that commit included is 3 reboots, so that's definitely at least an
>>> improvement.
>>
>> I give up.  GPU issues are not my thing.  2 reboots after I sent that it
>> gave me pretty rainbow static again.  So it might have been an
>> improvement, but revert it is not a solution.
>>
>> Looking at there rest of the commits, the whole GPU rework might be
>> suspect, but I clearly have no clue.
>
> GPUs are tricky beasts :)

Understatement ;).

> ca57802e521de54341efc8a56f70571f79ffac72 mostly likely wasn't the
> problem anyway since it only affects 6xx/7xx and your card is handled
> by the evergreen code.  I'll put together some patches to help narrow
> down the problem.

Yeah, that's the biggest problem I have, not knowing which functions are
actually being executed for this card.  It looks like a combination of
stuff in evergreen.c and ni.c, but I have no idea.

Patches would be great.  If nothing else, I'm really good at building
kernels and rebooting by now.

josh
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