[Bug 97779] [regression, bisected][BDW, GPU hang] stuck on render ring, always reproducible

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97779

--- Comment #18 from regwz <regwz at seznam.cz> ---
(In reply to Jason Ekstrand from comment #17)
> This bisect is bad.  You were bisecting through the Vulkan merge.  Back when
> the Vulkan driver was still in development the i965 driver in the vulkan
> branch was very unstable.  In order to get a proper bisect, you need to do
> so while ignoring the vulkan branch.

Sorry about that and thank you for the explanation. I redid the bisect, here
are the results:

963513bb24bdd542f1af3733fab53ad450d3221b is the first bad commit
commit 963513bb24bdd542f1af3733fab53ad450d3221b
Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Tue Dec 8 17:34:38 2015 -0800

    i965/fs: Push small uniform arrays

    Unfortunately, this also means that we need to use a slightly different
    algorithm for assign_constant_locations.  The old algorithm worked based on
    the assumption that each read of a uniform value read exactly one float.
    If it encountered a MOV_INDIRECT, it would immediately bail and push the
    whole thing.  Since we can now read ranges using MOV_INDIRECT, we need to
    be able to push a series of floats without breaking them up.  To do this,
    we use an algorithm similar to the on in split_virtual_grfs.

    Reviewed-by: Kristian Høgsberg <krh at bitplanet.net>
    Acked-by: Kenneth Graunke <kenneth at whitecape.org>


> I doubt that given that I can't get that commit to revert cleanly.  A
> similar commit does exist in the main tree and happened shortly prior to
> merging the vulkan branch.  The commit you point to got lost in the merge. 
> In any case, please re-bisect.

Yes, there were merge conflicts, but I resolved them manually (see attachment
https://bugs.freedesktop.org/attachment.cgi?id=127344).

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