[Mesa-stable] [PATCH 1/2] i965: Make intel_emit_linear_blit handle Gen8+ alignment restrictions.

[Ian Romanick]

On 04/22/2015 02:28 PM, Kenneth Graunke wrote:
> On Wednesday, April 22, 2015 02:19:35 PM Ian Romanick wrote:
>> Assuming this solves the GPU hangs, the series is
>>
>> Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
> 
> Hmm?  What GPU hangs?  These patches solve misrendering in

When we talked about this in the office last week, I could have sworn
that there were GPU hangs involved.  Call it bad memory after lots of
flying. :)

> GLbenchmark 2.7/TRex on Broadwell, where there were a bunch of stray
> triangles.
> 
> When our glBufferSubData path hits a busy buffer, we queue a BLT upload.
> That blit might be unaligned.  I suspect that the new data in the
> unaligned section never landed (or some data was trashed?), so some
> vertices end up with bogus data, and some triangles go awry.
> 
> I'm not aware of any GPU hangs.


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