[Bug 98213] [skl] fbc clobbers stolen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98213

Paulo Zanoni <przanoni at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #9 from Paulo Zanoni <przanoni at gmail.com> ---
(In reply to Greg White from comment #6)
> OK, that took a long time, but looks like this is it:
> 
> c58b735fc762e891481e92af7124b85cb0a51fce is the first bad commit
> commit c58b735fc762e891481e92af7124b85cb0a51fce
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Thu Aug 18 17:16:57 2016 +0100
> 
>     drm/i915: Allocate rings from stolen
>     
>     If we have stolen available, make use of it for ringbuffer allocation.
>     Previously this was restricted to !llc platforms, as writing to stolen
>     requires a GGTT mapping - but now that we have partial mappable support,
>     the mappable aperture isn't quite so precious so we can use it more
>     freely and ringbuffers are a good user for the otherwise wasted stolen.
>     
>     Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>     Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
>     Link:
> http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-18-
> chris at chris-wilson.co.uk
> 
> :040000 040000 1a77b1ba168a72106a74ae5ad3f28a49f40a88b0
> 2cf3076da77f4753071dfb926e391166a8532354 M      drivers

Thanks a lot for bisecting this! It's really helpful for us!

Can you please check if the patches located at
https://people.freedesktop.org/~pzanoni/bug98213/ solve the problem for you?

It would be really good if you could apply patch 1, then boot with
drm.debug=0xe, reproduce the problem and attach dmesg to us.

Also, in case you conclude that applying the 5 patches solves the problem for
you, it would be important to discover which one of these patches alone solves
the problem.

Thanks!
Paulo

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