[Intel-gfx] [PATCH 2/2] drm/i915: Add assert for no pending GPU requests during resume in LR mode

[Imre Deak]

During resume we will reset the SW/HW tracking for each ring head/tail
pointers and so are not prepared to replay any pending requests (as
opposed to GPU reset time). Add an assert for this.

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index ee4aaf1..ae46345 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -2158,6 +2158,8 @@ void intel_lr_context_resume(struct drm_i915_private *dev_priv)
 			if (WARN_ON(IS_ERR(reg)))
 				continue;
 
+			WARN_ON(!execlists_elsp_idle(engine));
+
 			reg += LRC_STATE_PN * PAGE_SIZE / sizeof(*reg);
 			reg[CTX_RING_HEAD+1] = 0;
 			reg[CTX_RING_TAIL+1] = 0;
-- 
2.5.0