[Intel-gfx] [PATCH] drm/i915/resets: Don't set / test for per-engine reset bits with GuC submission

[Matthew Brost]

Don't set, test for, or clear per-engine reset bits with GuC submission
as the GuC owns the per engine resets not the i915. Setting, testing
for, and clearing these bits is causing issues with the hangcheck
selftest. Rather than change to test to not use these bits, rip the use
of these bits out from the reset code.

Signed-off-by: Matthew Brost <matthew.brost at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_reset.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c
index 91200c43951f..51b56b8e5003 100644
--- a/drivers/gpu/drm/i915/gt/intel_reset.c
+++ b/drivers/gpu/drm/i915/gt/intel_reset.c
@@ -1367,20 +1367,27 @@ void intel_gt_handle_error(struct intel_gt *gt,
 	/* Make sure i915_reset_trylock() sees the I915_RESET_BACKOFF */
 	synchronize_rcu_expedited();
 
-	/* Prevent any other reset-engine attempt. */
-	for_each_engine(engine, gt, tmp) {
-		while (test_and_set_bit(I915_RESET_ENGINE + engine->id,
-					&gt->reset.flags))
-			wait_on_bit(&gt->reset.flags,
-				    I915_RESET_ENGINE + engine->id,
-				    TASK_UNINTERRUPTIBLE);
+	/*
+	 * Prevent any other reset-engine attempt. We don't do this for GuC
+	 * submission the GuC owns the per-engine reset, not the i915.
+	 */
+	if (!intel_uc_uses_guc_submission(&gt->uc)) {
+		for_each_engine(engine, gt, tmp) {
+			while (test_and_set_bit(I915_RESET_ENGINE + engine->id,
+						&gt->reset.flags))
+				wait_on_bit(&gt->reset.flags,
+					    I915_RESET_ENGINE + engine->id,
+					    TASK_UNINTERRUPTIBLE);
+		}
 	}
 
 	intel_gt_reset_global(gt, engine_mask, msg);
 
-	for_each_engine(engine, gt, tmp)
-		clear_bit_unlock(I915_RESET_ENGINE + engine->id,
-				 &gt->reset.flags);
+	if (!intel_uc_uses_guc_submission(&gt->uc)) {
+		for_each_engine(engine, gt, tmp)
+			clear_bit_unlock(I915_RESET_ENGINE + engine->id,
+					 &gt->reset.flags);
+	}
 	clear_bit_unlock(I915_RESET_BACKOFF, &gt->reset.flags);
 	smp_mb__after_atomic();
 	wake_up_all(&gt->reset.queue);
-- 
2.32.0