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drm/i915: Skip engine serialisation for no-op seqno reset 

If the engine's seqno is already at our target seqno (most likely it
hasn't been used since the last reset), we can skip serialising the
engine and leave it as is.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181126095610.20962-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-11-26 09:56:10 +00:00
parent b7f2189927
commit 39e84937b5
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/i915_request.c
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@ -136,6 +136,9 @@ static int reset_all_global_seqno(struct drm_i915_private *i915, u32 seqno)
intel_engine_get_seqno(engine),
seqno);
if (seqno == engine->timeline.seqno)
continue;
kthread_park(engine->breadcrumbs.signaler);
if (!i915_seqno_passed(seqno, engine->timeline.seqno)) {