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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
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@ -136,6 +136,9 @@ static int reset_all_global_seqno(struct drm_i915_private *i915, u32 seqno)
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intel_engine_get_seqno(engine),
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seqno);
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if (seqno == engine->timeline.seqno)
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continue;
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kthread_park(engine->breadcrumbs.signaler);
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if (!i915_seqno_passed(seqno, engine->timeline.seqno)) {
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