Commit 39f3be16 authored Jul 30, 2018 by Chris Wilson

drm/i915: Kick waiters on resetting legacy rings

For reasons unknown, interrupts following a reset do not arrive, but
this can be papered over by kicking any waiter and peeking at the
breadcrumbs following the reset.

Testcase: igt/gem_eio/reset-stress
References: https://bugs.freedesktop.org/show_bug.cgi?id=105957


Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180730075351.15569-2-chris@chris-wilson.co.uk

parent 86c1c87d

drivers/gpu/drm/i915/intel_ringbuffer.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -527,6 +527,8 @@ static int init_ring_common(struct intel_engine_cs *engine)
		if (INTEL_GEN(dev_priv) > 2)
		I915_WRITE_MODE(engine, _MASKED_BIT_DISABLE(STOP_RING));

		/* Papering over lost _interrupts_ immediately following the restart */
		intel_engine_wakeup(engine);
		out:
		intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);