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The GPU records whether it is currently waiting for a completion of a WAIT_FOR_EVENT in the RB_WAIT bit in the ringbuffer control registers. On third generation chipsets and later, a write of 1 to this bit breaks the hang and returns the GPU to arbitration, i.e. the GPU should continue executing the reminder of the batchbuffer and return to normal operations. By adding this to hangcheck we can avoid a full GPU reset under these conditions. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> |
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