39e78234b0
There is a problem with kbl up to rev E0 where a heavy memory/fabric traffic from adjacent engine(s) can cause an engine reset to fail. This traffic can be from normal memory accesses or it can be from heavy polling on a semaphore wait. For engine hogging causing a fail, we already fallback to full reset. Which effectively stops all engines and thus we only add a workaround documentation. For the semaphore wait loop poll case, we add one microsecond poll interval to semaphore wait to guarantee bandwidth for the reset preration. The side effect is that we make semaphore completion latencies also 1us longer. v2: Let full reset handle the adjacent engine idling (Chris) v3: Skip render engine (Joonas), please checkpatch on define (Mika) References: https://bugs.freedesktop.org/show_bug.cgi?id=106684 References: VTHSD#2227190, HSDES#1604216706, BSID#0917 Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Acked-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180607172444.17080-1-mika.kuoppala@linux.intel.com |
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