1 files changed, 73 insertions, 0 deletions

diff --git a/drivers/dma-buf/seqno-fence.c b/drivers/dma-buf/seqno-fence.c
new file mode 100644
index 000000000000..7d12a39a4b57
--- /dev/null
+++ b/drivers/dma-buf/seqno-fence.c
@@ -0,0 +1,73 @@
+/*
+ * 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>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/seqno-fence.h>
+
+static const char *seqno_fence_get_driver_name(struct 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 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 fence *fence)
+{
+        struct seqno_fence *seqno_fence = to_seqno_fence(fence);
+        return seqno_fence->ops->enable_signaling(fence);
+}
+
+static bool seqno_signaled(struct 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 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
+                fence_free(&f->base);
+}
+
+static signed long seqno_wait(struct fence *fence, bool intr, signed long timeout)
+{
+        struct seqno_fence *f = to_seqno_fence(fence);
+        return f->ops->wait(fence, intr, timeout);
+}
+
+const struct 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);