[Intel-gfx] [PATCH 4/4] drm/i915: Include interesting seqno in the missed breadcrumb debug

[Chris Wilson]

Knowing the neighbouring seqno (current on hw, last submitted to hw)
provide some useful breadcrumbs to the debug log.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_breadcrumbs.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index 9ccbf26124c6..35da5928bd8a 100644
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -64,10 +64,12 @@ static unsigned long wait_timeout(void)
 
 static noinline void missed_breadcrumb(struct intel_engine_cs *engine)
 {
-	DRM_DEBUG_DRIVER("%s missed breadcrumb at %pF, irq posted? %s\n",
+	DRM_DEBUG_DRIVER("%s missed breadcrumb at %pF, irq posted? %s, current seqno=%x, last=%x\n",
 			 engine->name, __builtin_return_address(0),
 			 yesno(test_bit(ENGINE_IRQ_BREADCRUMB,
-					&engine->irq_posted)));
+					&engine->irq_posted)),
+			 intel_engine_get_seqno(engine),
+			 intel_engine_last_submit(engine));
 
 	set_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
 }
-- 
2.11.0