drm/i915/breadcrumbs: Queue hangcheck before sleeping

Never go to sleep waiting on the GPU without first ensuring that we will
get woken up.

We have a choice of queuing the hangcheck before every schedule() or the
first time we wakeup. In order to simply accommodate both the signaler
and the ordinary waiter, move the queuing to the common point of
enabling the irq. We lose the paranoid safety of ensuring that the
hangcheck is active before the sleep, but avoid code duplication (and
redundant hangcheck queuing).

Testcase: igt/prime_busy
Fixes: c81d4613 ("drm/i915: Convert trace-irq to the breadcrumb waiter")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1468055535-19740-2-git-send-email-chris@chris-wilson.co.ukReviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

drivers/gpu/drm/i915/i915_gem.c

@@ -1501,15 +1501,6 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
 			break;
 		}
 
-		/* Ensure that even if the GPU hangs, we get woken up.
-		 *
-		 * However, note that if no one is waiting, we never notice
-		 * a gpu hang. Eventually, we will have to wait for a resource
-		 * held by the GPU and so trigger a hangcheck. In the most
-		 * pathological case, this will be upon memory starvation!
-		 */
-		i915_queue_hangcheck(req->i915);
-
 		timeout_remain = io_schedule_timeout(timeout_remain);
 		if (timeout_remain == 0) {
 			ret = -ETIME;

drivers/gpu/drm/i915/intel_breadcrumbs.c

@@ -93,6 +93,15 @@ static void __intel_breadcrumbs_enable_irq(struct intel_breadcrumbs *b)
 	if (!b->irq_enabled ||
 	    test_bit(engine->id, &i915->gpu_error.missed_irq_rings))
 		mod_timer(&b->fake_irq, jiffies + 1);
+
+	/* Ensure that even if the GPU hangs, we get woken up.
+	 *
+	 * However, note that if no one is waiting, we never notice
+	 * a gpu hang. Eventually, we will have to wait for a resource
+	 * held by the GPU and so trigger a hangcheck. In the most
+	 * pathological case, this will be upon memory starvation!
+	 */
+	i915_queue_hangcheck(i915);
 }
 
 static void __intel_breadcrumbs_disable_irq(struct intel_breadcrumbs *b)