[PATCH v2] drm/xe: Ignore GGTT TLB inval errors during GT reset

[Nirmoy Das]

During GT reset, GGTT TLB invalidations may fail. This is acceptable
as the reset will clear GGTT caches. Suppress only -ECANCELED other
return codes are still unexpected error.

v2: Add code comment(Matt).

Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/3389
Suggested-by: Matthew Brost <matthew.brost at intel.com>
Reviewed-by: Matthew Brost <matthew.brost at intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
---
 drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c
index 3cb228c773cd..4e9f89392160 100644
--- a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c
+++ b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c
@@ -253,9 +253,18 @@ static int xe_gt_tlb_invalidation_guc(struct xe_gt *gt,
 		0,  /* seqno, replaced in send_tlb_invalidation */
 		MAKE_INVAL_OP(XE_GUC_TLB_INVAL_GUC),
 	};
+	int ret;
+
+	ret = send_tlb_invalidation(&gt->uc.guc, fence, action,
+				    ARRAY_SIZE(action));
+	/*
+	 * -ECANCELED indicates the CT is stopped for a GT reset. TLB caches
+	 *  should be nuked on a GT reset so this error can be ignored.
+	 */
+	if (ret == -ECANCELED)
+		return 0;
 
-	return send_tlb_invalidation(&gt->uc.guc, fence, action,
-				     ARRAY_SIZE(action));
+	return ret;
 }
 
 /**
-- 
2.46.0