1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/selftests/lib_sw_fence.c b/drivers/gpu/drm/i915/selftests/lib_sw_fence.c
new file mode 100644
index 000000000000..3790fdf44a1a
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/lib_sw_fence.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include "lib_sw_fence.h"
+
+/* Small library of different fence types useful for writing tests */
+
+static int __i915_sw_fence_call
+nop_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
+{
+	return NOTIFY_DONE;
+}
+
+void __onstack_fence_init(struct i915_sw_fence *fence,
+			  const char *name,
+			  struct lock_class_key *key)
+{
+	debug_fence_init_onstack(fence);
+
+	__init_waitqueue_head(&fence->wait, name, key);
+	atomic_set(&fence->pending, 1);
+	fence->flags = (unsigned long)nop_fence_notify;
+}
+
+void onstack_fence_fini(struct i915_sw_fence *fence)
+{
+	i915_sw_fence_commit(fence);
+	i915_sw_fence_fini(fence);
+}
+
+static void timed_fence_wake(unsigned long data)
+{
+	struct timed_fence *tf = (struct timed_fence *)data;
+
+	i915_sw_fence_commit(&tf->fence);
+}
+
+void timed_fence_init(struct timed_fence *tf, unsigned long expires)
+{
+	onstack_fence_init(&tf->fence);
+
+	setup_timer_on_stack(&tf->timer, timed_fence_wake, (unsigned long)tf);
+
+	if (time_after(expires, jiffies))
+		mod_timer(&tf->timer, expires);
+	else
+		i915_sw_fence_commit(&tf->fence);
+}
+
+void timed_fence_fini(struct timed_fence *tf)
+{
+	if (del_timer_sync(&tf->timer))
+		i915_sw_fence_commit(&tf->fence);
+
+	destroy_timer_on_stack(&tf->timer);
+	i915_sw_fence_fini(&tf->fence);
+}