disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/gpu/drm/i915/selftests/lib_sw_fence.c
..
..
@@ -40,11 +40,15 @@
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 	__init_waitqueue_head(&fence->wait, name, key);
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 	atomic_set(&fence->pending, 1);
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+	fence->error = 0;
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 	fence->flags = (unsigned long)nop_fence_notify;
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 }
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 void onstack_fence_fini(struct i915_sw_fence *fence)
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 {
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+	if (!fence->flags)
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+		return;
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+
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 	i915_sw_fence_commit(fence);
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 	i915_sw_fence_fini(fence);
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 }
..
..
@@ -76,3 +80,57 @@
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 	destroy_timer_on_stack(&tf->timer);
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 	i915_sw_fence_fini(&tf->fence);
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 }
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+
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+struct heap_fence {
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+	struct i915_sw_fence fence;
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+	union {
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+		struct kref ref;
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+		struct rcu_head rcu;
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+	};
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+};
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+
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+static int __i915_sw_fence_call
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+heap_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
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+{
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+	struct heap_fence *h = container_of(fence, typeof(*h), fence);
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+
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+	switch (state) {
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+	case FENCE_COMPLETE:
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+		break;
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+
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+	case FENCE_FREE:
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+		heap_fence_put(&h->fence);
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+	}
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+
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+	return NOTIFY_DONE;
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+}
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+
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+struct i915_sw_fence *heap_fence_create(gfp_t gfp)
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+{
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+	struct heap_fence *h;
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+
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+	h = kmalloc(sizeof(*h), gfp);
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+	if (!h)
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+		return NULL;
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+
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+	i915_sw_fence_init(&h->fence, heap_fence_notify);
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+	refcount_set(&h->ref.refcount, 2);
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+
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+	return &h->fence;
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+}
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+
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+static void heap_fence_release(struct kref *ref)
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+{
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+	struct heap_fence *h = container_of(ref, typeof(*h), ref);
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+
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+	i915_sw_fence_fini(&h->fence);
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+
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+	kfree_rcu(h, rcu);
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+}
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+
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+void heap_fence_put(struct i915_sw_fence *fence)
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+{
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+	struct heap_fence *h = container_of(fence, typeof(*h), fence);
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+
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+	kref_put(&h->ref, heap_fence_release);
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+}