[PATCH v4 1/3] drm/i915/gt: Ignore TLB invalidations on idle engines

[Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>]

From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>

As an extension of the current skip TLB invalidations if the device is
powered down, we recognised that prior to any engine activity, all the
TLBs are explicitly invalidated. Thus anytime we know the engine is
asleep, we can skip invalidating the TLBs on that engine.

Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/gt/intel_gt_pm.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.h b/drivers/gpu/drm/i915/gt/intel_gt_pm.h
index bc898df7a48cc..3b1fbce7ea369 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.h
@@ -55,6 +55,10 @@ static inline void intel_gt_pm_might_put(struct intel_gt *gt)
 	for (tmp = 1, intel_gt_pm_get(gt); tmp; \
 	     intel_gt_pm_put(gt), tmp = 0)
 
+#define with_intel_gt_pm_if_awake(gt, tmp) \
+	for (tmp = 1, intel_gt_pm_get_if_awake(gt); tmp; \
+	     intel_gt_pm_put(gt), tmp = 0)
+
 static inline int intel_gt_pm_wait_for_idle(struct intel_gt *gt)
 {
 	return intel_wakeref_wait_for_idle(&gt->wakeref);
-- 
2.36.1