linux-kernel - [RFC PATCH 4/6] drm/xe: Skip waiting on unarmed fences in xe_gt_tlb_invalidation_fence

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Message-ID: <20250809135137.259427-5-thomas.hellstrom@linux.intel.com>
Date: Sat,  9 Aug 2025 15:51:35 +0200
From: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
To: intel-xe@...ts.freedesktop.org
Cc: Matthew Brost <matthew.brost@...el.com>,
	Christian König <christian.koenig@....com>,
	dri-devel@...ts.freedesktop.org,
	Jason Gunthorpe <jgg@...pe.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Simona Vetter <simona.vetter@...ll.ch>,
	Dave Airlie <airlied@...il.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 4/6] drm/xe: Skip waiting on unarmed fences in xe_gt_tlb_invalidation_fence_wait

From: Matthew Brost <matthew.brost@...el.com>

Avoids unnecessary waits when the TLB invalidation fence has not been
armed, simplifying caller logic in cases where the fence status is
uncertain.

Signed-off-by: Matthew Brost <matthew.brost@...el.com>
---
 drivers/gpu/drm/xe/xe_gt_tlb_invalidation.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.h b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.h
index f7f0f2eaf4b5..c6d4398d3429 100644
--- a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.h
+++ b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.h
@@ -34,7 +34,8 @@ void xe_gt_tlb_invalidation_fence_signal(struct xe_gt_tlb_invalidation_fence *fe
 static inline void
 xe_gt_tlb_invalidation_fence_wait(struct xe_gt_tlb_invalidation_fence *fence)
 {
-	dma_fence_wait(&fence->base, false);
+	if (fence->seqno)
+		dma_fence_wait(&fence->base, false);
 }
 
 #endif	/* _XE_GT_TLB_INVALIDATION_ */
-- 
2.50.1