drm/i915: Add ringbuffer wait reset to hangcheck

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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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Chris Wilson 2010-08-08 20:38:12 +01:00

parent 4b60e5cb70

commit 8c80b59b37

1 changed files with 16 additions and 0 deletions

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drivers/gpu/drm/i915/i915_irq.c

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