[Intel-gfx] [CI 2/2] drm/i915/gt: Trace the CS interrupt

[Chris Wilson]

We have traces for the semaphore and the error, but not the far more
frequent CS interrupts. This is likely to be too much, but for the
purpose of live_unlite_preempt it may answer a question or two.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_gt_irq.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_irq.c b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
index 0cc7dd54f4f9..4291d55c5457 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_irq.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
@@ -48,8 +48,12 @@ cs_irq_handler(struct intel_engine_cs *engine, u32 iir)
 			tasklet = true;
 	}
 
-	if (iir & GT_CONTEXT_SWITCH_INTERRUPT)
+	if (iir & GT_CONTEXT_SWITCH_INTERRUPT) {
+		ENGINE_TRACE(engine, "CS: %x %x\n",
+			     ENGINE_READ_FW(engine, RING_EXECLIST_STATUS_HI),
+			     ENGINE_READ_FW(engine, RING_EXECLIST_STATUS_LO));
 		tasklet = true;
+	}
 
 	if (iir & GT_RENDER_USER_INTERRUPT) {
 		intel_engine_signal_breadcrumbs(engine);
-- 
2.20.1