drm/i915: Kick waiters on resetting legacy rings
authorChris Wilson <chris@chris-wilson.co.uk>
Mon, 30 Jul 2018 07:53:50 +0000 (08:53 +0100)
committerChris Wilson <chris@chris-wilson.co.uk>
Mon, 30 Jul 2018 09:32:07 +0000 (10:32 +0100)
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
drivers/gpu/drm/i915/intel_ringbuffer.c

index d1e03b7fbffa4d5b44bef7f8b87c8bae8f7262ce..80a8b6e573745ebbb21e16496ba4e580f2a31a43 100644 (file)
@@ -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);