1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/dma-buf/seqno-fence.c b/drivers/dma-buf/seqno-fence.c
new file mode 100644
index 000000000..bfe14e94c
--- /dev/null
+++ b/drivers/dma-buf/seqno-fence.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * seqno-fence, using a dma-buf to synchronize fencing
+ *
+ * Copyright (C) 2012 Texas Instruments
+ * Copyright (C) 2012-2014 Canonical Ltd
+ * Authors:
+ *   Rob Clark <robdclark@gmail.com>
+ *   Maarten Lankhorst <maarten.lankhorst@canonical.com>
+ */
+
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/seqno-fence.h>
+
+static const char *seqno_fence_get_driver_name(struct dma_fence *fence)
+{
+	struct seqno_fence *seqno_fence = to_seqno_fence(fence);
+
+	return seqno_fence->ops->get_driver_name(fence);
+}
+
+static const char *seqno_fence_get_timeline_name(struct dma_fence *fence)
+{
+	struct seqno_fence *seqno_fence = to_seqno_fence(fence);
+
+	return seqno_fence->ops->get_timeline_name(fence);
+}
+
+static bool seqno_enable_signaling(struct dma_fence *fence)
+{
+	struct seqno_fence *seqno_fence = to_seqno_fence(fence);
+
+	return seqno_fence->ops->enable_signaling(fence);
+}
+
+static bool seqno_signaled(struct dma_fence *fence)
+{
+	struct seqno_fence *seqno_fence = to_seqno_fence(fence);
+
+	return seqno_fence->ops->signaled && seqno_fence->ops->signaled(fence);
+}
+
+static void seqno_release(struct dma_fence *fence)
+{
+	struct seqno_fence *f = to_seqno_fence(fence);
+
+	dma_buf_put(f->sync_buf);
+	if (f->ops->release)
+		f->ops->release(fence);
+	else
+		dma_fence_free(&f->base);
+}
+
+static signed long seqno_wait(struct dma_fence *fence, bool intr,
+			      signed long timeout)
+{
+	struct seqno_fence *f = to_seqno_fence(fence);
+
+	return f->ops->wait(fence, intr, timeout);
+}
+
+const struct dma_fence_ops seqno_fence_ops = {
+	.get_driver_name = seqno_fence_get_driver_name,
+	.get_timeline_name = seqno_fence_get_timeline_name,
+	.enable_signaling = seqno_enable_signaling,
+	.signaled = seqno_signaled,
+	.wait = seqno_wait,
+	.release = seqno_release,
+};
+EXPORT_SYMBOL(seqno_fence_ops);