tree cd1faa49986f62e1f37fde2cbc162343a922dd2d
parent 4b60e5cb707aa1d44fd01680296a2caf45dd6fae
author Chris Wilson <chris@chris-wilson.co.uk> 1281296292 +0100
committer Chris Wilson <chris@chris-wilson.co.uk> 1283941799 +0100

drm/i915: Add ringbuffer wait reset to hangcheck

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>