drm/i915: Mark all current requests as complete before resetting them
Following a GPU reset upon hang, we retire all the requests and then
mark them all as complete. If we mark them as complete first, we both
keep the normal retirement order (completed first then retired) and
provide a small optimisation for concurrent lookups.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1469002875-2335-3-git-send-email-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 6df1405..61729d6 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2486,6 +2486,12 @@
i915_gem_object_retire__read(obj, engine->id);
}
+ /* Mark all pending requests as complete so that any concurrent
+ * (lockless) lookup doesn't try and wait upon the request as we
+ * reset it.
+ */
+ intel_ring_init_seqno(engine, engine->last_submitted_seqno);
+
/*
* Clear the execlists queue up before freeing the requests, as those
* are the ones that keep the context and ringbuffer backing objects
@@ -2528,8 +2534,6 @@
intel_ring_update_space(buffer);
}
- intel_ring_init_seqno(engine, engine->last_submitted_seqno);
-
engine->i915->gt.active_engines &= ~intel_engine_flag(engine);
}