drm/i915: Warn when execlists changes context without IRQs
If an batch ends while the IRQs are not turned on the notification can
go missing and the GPU can hang. So generate a warning in this case.
Signed-off-by: Peter Antoine <peter.antoine@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 0fa9209..0413b8f 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -394,6 +394,12 @@
assert_spin_locked(&ring->execlist_lock);
+ /*
+ * If irqs are not active generate a warning as batches that finish
+ * without the irqs may get lost and a GPU Hang may occur.
+ */
+ WARN_ON(!intel_irqs_enabled(ring->dev->dev_private));
+
if (list_empty(&ring->execlist_queue))
return;