https://bugs.freedesktop.org/show_bug.cgi?id=108591

Martin Peres martin.peres@free.fr changed:

What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |CLOSED

--- Comment #11 from Martin Peres martin.peres@free.fr --- (In reply to Chris Wilson from comment #10)

commit 7fa28e146994da1e8a4124623d7da97b798ea520 (HEAD -> drm-intel-next-queued, drm-intel/for-linux-next, drm-intel/drm-intel-next-queued) Author: Chris Wilson chris@chris-wilson.co.uk Date: Mon Nov 19 15:41:53 2018 +0000

drm/i915: Write GPU relocs harder with gen3

Under moderate amounts of GPU stress, we can observe on Bearlake and
Pineview (later gen3 models) that we execute the following batch buffer
before the write into the batch is coherent. Adding extra (tested with
upto 32x) MI_FLUSH to either the invalidation, flush or both phases does
not solve the incoherency issue with the relocations, but emitting the
MI_STORE_DWORD_IMM twice does. So be it.

Fixes: 7dd4f6729f92 ("drm/i915: Async GPU relocation processing")
Testcase: igt/gem_tiled_fence_blits # blb/pnv
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link:

https://patchwork.freedesktop.org/patch/msgid/20181119154153.15327-1- chris@chris-wilson.co.uk

Oddly-enough, this was not sufficient to fix the issue, but it stopped failing after drmtip_176 (https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_176/fi-gdg-551/igt@gem_tiled...), so closing!