[PATCH 1/2] drm/i915/gt: Sanitize RPS interrupts upon resume

[Chris Wilson]

Currently we clear and disable the RPS pm interrupts on module load, and
presume that they remain disabled forevermore. However, the mask is
cleared on suspend and so after resume they may start showing up again
unexepectedly.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1811
Fixes: 8e99299a04bc ("drm/i915/gt: Track use of RPS interrupts in flags")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Andi Shyti <andi at etezian.org>
---
 drivers/gpu/drm/i915/gt/intel_gt_pm.c | 2 ++
 drivers/gpu/drm/i915/gt/intel_rps.c   | 5 ++++-
 drivers/gpu/drm/i915/gt/intel_rps.h   | 1 +
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
index 5097786f4375..e59776485457 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -171,6 +171,8 @@ static void gt_sanitize(struct intel_gt *gt, bool force)
 		if (engine->reset.finish)
 			engine->reset.finish(engine);
 
+	intel_rps_sanitize(&gt->rps);
+
 	intel_uncore_forcewake_put(gt->uncore, FORCEWAKE_ALL);
 	intel_runtime_pm_put(gt->uncore->rpm, wakeref);
 }
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
index c682355ec79e..2f59fc6df3c2 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -1844,8 +1844,11 @@ void intel_rps_init(struct intel_rps *rps)
 
 	if (INTEL_GEN(i915) >= 8 && INTEL_GEN(i915) < 11)
 		rps->pm_intrmsk_mbz |= GEN8_PMINTR_DISABLE_REDIRECT_TO_GUC;
+}
 
-	if (INTEL_GEN(i915) >= 6)
+void intel_rps_sanitize(struct intel_rps *rps)
+{
+	if (INTEL_GEN(rps_to_i915(rps)) >= 6)
 		rps_disable_interrupts(rps);
 }
 
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.h b/drivers/gpu/drm/i915/gt/intel_rps.h
index af07fa5b7584..8d3c9d663662 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.h
+++ b/drivers/gpu/drm/i915/gt/intel_rps.h
@@ -13,6 +13,7 @@ struct i915_request;
 
 void intel_rps_init_early(struct intel_rps *rps);
 void intel_rps_init(struct intel_rps *rps);
+void intel_rps_sanitize(struct intel_rps *rps);
 
 void intel_rps_driver_register(struct intel_rps *rps);
 void intel_rps_driver_unregister(struct intel_rps *rps);
-- 
2.20.1