[PATCH 1/2] drm/i915/guc: Improve clean up of busyness stats worker

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

The stats worker thread management was mis-matched between
enable/disable call sites. Fix those up. Also, abstract the cancel
code into a helper function rather than replicating in multiple places.

Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 22 ++++++++++++-------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index b436dd7f12e42..982364777d0c6 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1435,19 +1435,25 @@ static void guc_init_engine_stats(struct intel_guc *guc)
 {
 	struct intel_gt *gt = guc_to_gt(guc);
 	intel_wakeref_t wakeref;
+	int ret;
 
 	mod_delayed_work(system_highpri_wq, &guc->timestamp.work,
 			 guc->timestamp.ping_delay);
 
-	with_intel_runtime_pm(&gt->i915->runtime_pm, wakeref) {
-		int ret = guc_action_enable_usage_stats(guc);
+	with_intel_runtime_pm(&gt->i915->runtime_pm, wakeref)
+		ret = guc_action_enable_usage_stats(guc);
 
-		if (ret)
-			drm_err(&gt->i915->drm,
-				"Failed to enable usage stats: %d!\n", ret);
+	if (ret) {
+		cancel_delayed_work_sync(&guc->timestamp.work);
+		drm_err(&gt->i915->drm, "Failed to enable usage stats: %d!\n", ret);
 	}
 }
 
+static void guc_park_engine_stats(struct intel_guc *guc)
+{
+	cancel_delayed_work_sync(&guc->timestamp.work);
+}
+
 void intel_guc_busyness_park(struct intel_gt *gt)
 {
 	struct intel_guc *guc = &gt->uc.guc;
@@ -1460,7 +1466,7 @@ void intel_guc_busyness_park(struct intel_gt *gt)
 	 * and causes an unclaimed register access warning. Cancel the worker
 	 * synchronously here.
 	 */
-	cancel_delayed_work_sync(&guc->timestamp.work);
+	guc_park_engine_stats(guc);
 
 	/*
 	 * Before parking, we should sample engine busyness stats if we need to.
@@ -4409,11 +4415,11 @@ void intel_guc_submission_enable(struct intel_guc *guc)
 	guc_init_global_schedule_policy(guc);
 }
 
+/* Note: By the time we're here, GuC may have already been reset */
 void intel_guc_submission_disable(struct intel_guc *guc)
 {
 	struct intel_gt *gt = guc_to_gt(guc);
-
-	/* Note: By the time we're here, GuC may have already been reset */
+	guc_park_engine_stats(guc);
 
 	/* Disable and route to host */
 	if (GRAPHICS_VER(gt->i915) >= 12)
-- 
2.39.0