https://bugs.freedesktop.org/show_bug.cgi?id=108591
--- Comment #6 from Chris Wilson <ch...@chris-wilson.co.uk> ---
(In reply to Chris Wilson from comment #5)
> As expected, elk/ilk is a completely different
> bug,https://patchwork.freedesktop.org/series/52013/
> and ideally shouldn't be grouped up with the igt bug.
commit 55f99bf2a9c331838c981694bc872cd1ec4070b2
Author: Chris Wilson <ch...@chris-wilson.co.uk>
Date: Mon Nov 5 09:43:05 2018 +0000
drm/i915/ringbuffer: Delay after EMIT_INVALIDATE for gen4/gen5
Exercising the gpu reloc path strenuously revealed an issue where the
updated relocations (from MI_STORE_DWORD_IMM) were not being observed
upon execution. After some experiments with adding pipecontrols (a lot
of pipecontrols (32) as gen4/5 do not have a bit to wait on earlier pipe
controls or even the current on), it was discovered that we merely
needed to delay the EMIT_INVALIDATE by several flushes. It is important
to note that it is the EMIT_INVALIDATE as opposed to the EMIT_FLUSH that
needs the delay as opposed to what one might first expect -- that the
delay is required for the TLB invalidation to take effect (one presumes
to purge any CS buffers) as opposed to a delay after flushing to ensure
the writes have landed before triggering invalidation.
Testcase: igt/gem_tiled_fence_blits
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: sta...@vger.kernel.org
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
Link:
https://patchwork.freedesktop.org/patch/msgid/20181105094305.5767-1-ch...@chris-wilson.co.uk
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