linux-kernel - Re: linux-next: Tree for Aug 21 [ screen corruption in graphical mode ]

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Date:	Fri, 23 Aug 2013 10:04:37 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	linux-next <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: linux-next: Tree for Aug 21 [ screen corruption in graphical mode ]

On Fri, Aug 23, 2013 at 9:55 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Thu, Aug 22, 2013 at 1:32 PM, Daniel Vetter <daniel.vetter@...ll.ch> wrote:
>> On Thu, Aug 22, 2013 at 1:30 PM, Daniel Vetter <daniel.vetter@...ll.ch> wrote:
>>> On Thu, Aug 22, 2013 at 1:13 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>>>> dmesg (a lot of traces) and kernel-config attached.
>>>>
>>>> UXA causes still screen corruption.
>>>
>>> Hm, was only a slim chance that this patch would fix anything - I
>>> think you'd always see an oops when you'd hit this bug instead of just
>>> a bit of corruption.
>>
>> Ok, I think it's time to throw in the towel a bit. I've dropped
>>
>>
>> commit d46f1c3f1372e3a72fab97c60480aa4a1084387f
>> Author: Chris Wilson <chris@...is-wilson.co.uk>
>> Date:   Thu Aug 8 14:41:06 2013 +0100
>>
>>     drm/i915: Allow the GPU to cache stolen memory
>>
>> from my queue. I guess we can retry for 3.13 again.
>
> I am sorry to keep someone's work to be delayed, really.
> I would have liked to see this fixed (and I have spent some time on it).
>
> Which patches did you exactly drop?
>

Sorry for bombing you with question...

I am trying latest Linus-tree HEAD with the drm-intel-nightly I made
my last testings.

Are any of these TLB / x86-get_unmapped_area fixes of interested...
has any effects on the reported issue?

I still wonder what is the root-cause...
I mean if SNA is OK but UXA not and Linux graphics stack is that complex.
( Can't say if user-space like unity isn't involved... ).

- Sedat -

[1] Fix TLB gather virtual address range invalidation corner cases
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/?id=2b047252d087be7f2ba088b4933cd904f92e6fce

[2] Revert "x86 get_unmapped_area(): use proper mmap base for
bottom-up direction"
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/?id=5ea80f76a56605a190a7ea16846c82aa63dbd0aa

[3] x86 get_unmapped_area: Access mmap_legacy_base through mm_struct member
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/?id=41aacc1eea645c99edbe8fbcf78a97dc9b862adc
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