[PATCH v1 1/3] drm/i915/guc: Flush context destruction worker at suspend

[Alan Previn]

Suspend is not like reset, it can unroll, so we have to properly
flush pending context-guc-id deregistrations to complete before
we return from suspend calls.

Signed-off-by: Alan Previn <alan.previn.teres.alexis at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt_pm.c             | 6 +++++-
 drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 5 +++++
 drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h | 2 ++
 drivers/gpu/drm/i915/gt/uc/intel_uc.c             | 7 +++++++
 drivers/gpu/drm/i915/gt/uc/intel_uc.h             | 1 +
 5 files changed, 20 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 5a942af0a14e..3162d859ed68 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -289,8 +289,10 @@ int intel_gt_resume(struct intel_gt *gt)
 
 static void wait_for_suspend(struct intel_gt *gt)
 {
-	if (!intel_gt_pm_is_awake(gt))
+	if (!intel_gt_pm_is_awake(gt)) {
+		intel_uc_suspend_prepare(&gt->uc);
 		return;
+	}
 
 	if (intel_gt_wait_for_idle(gt, I915_GT_SUSPEND_IDLE_TIMEOUT) == -ETIME) {
 		/*
@@ -299,6 +301,8 @@ static void wait_for_suspend(struct intel_gt *gt)
 		 */
 		intel_gt_set_wedged(gt);
 		intel_gt_retire_requests(gt);
+	} else {
+		intel_uc_suspend_prepare(&gt->uc);
 	}
 
 	intel_gt_pm_wait_for_idle(gt);
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 a0e3ef1c65d2..dc7735a19a5a 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1578,6 +1578,11 @@ static void guc_flush_submissions(struct intel_guc *guc)
 	spin_unlock_irqrestore(&sched_engine->lock, flags);
 }
 
+void intel_guc_submission_suspend_prepare(struct intel_guc *guc)
+{
+	flush_work(&guc->submission_state.destroyed_worker);
+}
+
 static void guc_flush_destroyed_contexts(struct intel_guc *guc);
 
 void intel_guc_submission_reset_prepare(struct intel_guc *guc)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h
index c57b29cdb1a6..7f0705ece74b 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h
@@ -38,6 +38,8 @@ int intel_guc_wait_for_pending_msg(struct intel_guc *guc,
 				   bool interruptible,
 				   long timeout);
 
+void intel_guc_submission_suspend_prepare(struct intel_guc *guc);
+
 static inline bool intel_guc_submission_is_supported(struct intel_guc *guc)
 {
 	return guc->submission_supported;
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
index 18250fb64bd8..468d7b397927 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -679,6 +679,13 @@ void intel_uc_runtime_suspend(struct intel_uc *uc)
 	guc_disable_communication(guc);
 }
 
+void intel_uc_suspend_prepare(struct intel_uc *uc)
+{
+	struct intel_guc *guc = &uc->guc;
+
+	intel_guc_submission_suspend_prepare(guc);
+}
+
 void intel_uc_suspend(struct intel_uc *uc)
 {
 	struct intel_guc *guc = &uc->guc;
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.h b/drivers/gpu/drm/i915/gt/uc/intel_uc.h
index 014bb7d83689..036877a07261 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.h
@@ -49,6 +49,7 @@ void intel_uc_reset_prepare(struct intel_uc *uc);
 void intel_uc_reset(struct intel_uc *uc, intel_engine_mask_t stalled);
 void intel_uc_reset_finish(struct intel_uc *uc);
 void intel_uc_cancel_requests(struct intel_uc *uc);
+void intel_uc_suspend_prepare(struct intel_uc *uc);
 void intel_uc_suspend(struct intel_uc *uc);
 void intel_uc_runtime_suspend(struct intel_uc *uc);
 int intel_uc_resume(struct intel_uc *uc);
-- 
2.39.0