drm/xe: Add xe_gt_tlb_invalidation_fence_init helper

Other layers should not be touching struct xe_gt_tlb_invalidation_fence
directly, add helper for initialization.

v2:
 - Add dma_fence_get and list init to xe_gt_tlb_invalidation_fence_init
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240719172905.1527927-2-matthew.brost@intel.com

drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c

@@ -508,3 +508,39 @@ int xe_guc_tlb_invalidation_done_handler(struct xe_guc *guc, u32 *msg, u32 len)
 
 	return 0;
 }
+
+static const char *
+invalidation_fence_get_driver_name(struct dma_fence *dma_fence)
+{
+	return "xe";
+}
+
+static const char *
+invalidation_fence_get_timeline_name(struct dma_fence *dma_fence)
+{
+	return "invalidation_fence";
+}
+
+static const struct dma_fence_ops invalidation_fence_ops = {
+	.get_driver_name = invalidation_fence_get_driver_name,
+	.get_timeline_name = invalidation_fence_get_timeline_name,
+};
+
+/**
+ * xe_gt_tlb_invalidation_fence_init - Initialize TLB invalidation fence
+ * @gt: GT
+ * @fence: TLB invalidation fence to initialize
+ *
+ * Initialize TLB invalidation fence for use
+ */
+void xe_gt_tlb_invalidation_fence_init(struct xe_gt *gt,
+				       struct xe_gt_tlb_invalidation_fence *fence)
+{
+	spin_lock_irq(&gt->tlb_invalidation.lock);
+	dma_fence_init(&fence->base, &invalidation_fence_ops,
+		       &gt->tlb_invalidation.lock,
+		       dma_fence_context_alloc(1), 1);
+	spin_unlock_irq(&gt->tlb_invalidation.lock);
+	INIT_LIST_HEAD(&fence->link);
+	dma_fence_get(&fence->base);
+}

drivers/gpu/drm/xe/xe_gt_tlb_invalidation.h

@@ -26,4 +26,7 @@ int xe_gt_tlb_invalidation_range(struct xe_gt *gt,
 int xe_gt_tlb_invalidation_wait(struct xe_gt *gt, int seqno);
 int xe_guc_tlb_invalidation_done_handler(struct xe_guc *guc, u32 *msg, u32 len);
 
+void xe_gt_tlb_invalidation_fence_init(struct xe_gt *gt,
+				       struct xe_gt_tlb_invalidation_fence *fence);
+
 #endif	/* _XE_GT_TLB_INVALIDATION_ */

drivers/gpu/drm/xe/xe_pt.c

@@ -1317,23 +1317,6 @@ struct invalidation_fence {
 	u32 asid;
 };
 
-static const char *
-invalidation_fence_get_driver_name(struct dma_fence *dma_fence)
-{
-	return "xe";
-}
-
-static const char *
-invalidation_fence_get_timeline_name(struct dma_fence *dma_fence)
-{
-	return "invalidation_fence";
-}
-
-static const struct dma_fence_ops invalidation_fence_ops = {
-	.get_driver_name = invalidation_fence_get_driver_name,
-	.get_timeline_name = invalidation_fence_get_timeline_name,
-};
-
 static void invalidation_fence_cb(struct dma_fence *fence,
 				  struct dma_fence_cb *cb)
 {
@@ -1372,15 +1355,8 @@ static void invalidation_fence_init(struct xe_gt *gt,
 
 	trace_xe_gt_tlb_invalidation_fence_create(gt_to_xe(gt), &ifence->base);
 
-	spin_lock_irq(&gt->tlb_invalidation.lock);
-	dma_fence_init(&ifence->base.base, &invalidation_fence_ops,
-		       &gt->tlb_invalidation.lock,
-		       dma_fence_context_alloc(1), 1);
-	spin_unlock_irq(&gt->tlb_invalidation.lock);
-
-	INIT_LIST_HEAD(&ifence->base.link);
+	xe_gt_tlb_invalidation_fence_init(gt, &ifence->base);
 
-	dma_fence_get(&ifence->base.base);	/* Ref for caller */
 	ifence->fence = fence;
 	ifence->gt = gt;
 	ifence->start = start;