[PATCH 2/5] drm/i915/execlists: Detect cross-contamination with GuC

[Chris Wilson]

The process_csb routine from execlists_submission is incompatible with
the GuC backend. Add a warning to detect if we accidentally end up in
the wrong spot.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Michał Winiarski <michal.winiarski at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_lrc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index c400c66d0ee5..bbe6ece9b010 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -1169,6 +1169,7 @@ static void process_csb(struct intel_engine_cs *engine)
 	u8 head, tail;
 
 	lockdep_assert_held(&engine->active.lock);
+	GEM_BUG_ON(USES_GUC_SUBMISSION(engine->i915));
 
 	/*
 	 * Note that csb_write, csb_status may be either in HWSP or mmio.
-- 
2.20.1