[Intel-gfx] [PATCH 2/2] drm/i915: Arm the unclaimed mmio debugs on suspend path

[Mika Kuoppala]

If we go into suspend with unclaimed access detected,
it would be nice to catch that access on a next suspend path.
So instead of just notifying about it, arm the unclaimed
mmio checks on suspend side.

We want to keep the asymmetry on resume, as if it was
on resume path, it was not driver that is responsible so
no point in arming mmio debugs.

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c     | 2 +-
 drivers/gpu/drm/i915/i915_drv.h     | 2 +-
 drivers/gpu/drm/i915/intel_uncore.c | 7 +++++--
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 288fec7691dc..9de993d5fed2 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1502,7 +1502,7 @@ static int intel_runtime_suspend(struct device *device)
 	enable_rpm_wakeref_asserts(dev_priv);
 	WARN_ON_ONCE(atomic_read(&dev_priv->pm.wakeref_count));
 
-	if (intel_uncore_unclaimed_mmio(dev_priv))
+	if (intel_uncore_arm_unclaimed_mmio_detection(dev_priv))
 		DRM_ERROR("Unclaimed access detected prior to suspending\n");
 
 	dev_priv->pm.suspended = true;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 6ef03eea3518..04855f559dbf 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2720,7 +2720,7 @@ extern void intel_uncore_early_sanitize(struct drm_device *dev,
 					bool restore_forcewake);
 extern void intel_uncore_init(struct drm_device *dev);
 extern bool intel_uncore_unclaimed_mmio(struct drm_i915_private *dev_priv);
-extern void intel_uncore_arm_unclaimed_mmio_detection(struct drm_i915_private *dev_priv);
+extern bool intel_uncore_arm_unclaimed_mmio_detection(struct drm_i915_private *dev_priv);
 extern void intel_uncore_fini(struct drm_device *dev);
 extern void intel_uncore_forcewake_reset(struct drm_device *dev, bool restore);
 const char *intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id);
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 0b47bc891dc7..c3c13dc929cb 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -1610,12 +1610,12 @@ bool intel_uncore_unclaimed_mmio(struct drm_i915_private *dev_priv)
 	return check_for_unclaimed_mmio(dev_priv);
 }
 
-void
+bool
 intel_uncore_arm_unclaimed_mmio_detection(struct drm_i915_private *dev_priv)
 {
 	if (unlikely(i915.mmio_debug ||
 		     dev_priv->uncore.unclaimed_mmio_check <= 0))
-		return;
+		return false;
 
 	if (unlikely(intel_uncore_unclaimed_mmio(dev_priv))) {
 		DRM_DEBUG("Unclaimed register detected, "
@@ -1623,5 +1623,8 @@ intel_uncore_arm_unclaimed_mmio_detection(struct drm_i915_private *dev_priv)
 			  "Please use i915.mmio_debug=N for more information.\n");
 		i915.mmio_debug++;
 		dev_priv->uncore.unclaimed_mmio_check--;
+		return true;
 	}
+
+	return false;
 }
-- 
2.5.0