1 files changed, 136 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 000000000..bf2752cc1
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/lib_sw_fence.c
@@ -0,0 +1,136 @@
+/*
+ * 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
+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->error = 0;
+	fence->fn = nop_fence_notify;
+}
+
+void onstack_fence_fini(struct i915_sw_fence *fence)
+{
+	if (!fence->fn)
+		return;
+
+	i915_sw_fence_commit(fence);
+	i915_sw_fence_fini(fence);
+}
+
+static void timed_fence_wake(struct timer_list *t)
+{
+	struct timed_fence *tf = from_timer(tf, t, timer);
+
+	i915_sw_fence_commit(&tf->fence);
+}
+
+void timed_fence_init(struct timed_fence *tf, unsigned long expires)
+{
+	onstack_fence_init(&tf->fence);
+
+	timer_setup_on_stack(&tf->timer, timed_fence_wake, 0);
+
+	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);
+}
+
+struct heap_fence {
+	struct i915_sw_fence fence;
+	union {
+		struct kref ref;
+		struct rcu_head rcu;
+	};
+};
+
+static int
+heap_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
+{
+	struct heap_fence *h = container_of(fence, typeof(*h), fence);
+
+	switch (state) {
+	case FENCE_COMPLETE:
+		break;
+
+	case FENCE_FREE:
+		heap_fence_put(&h->fence);
+	}
+
+	return NOTIFY_DONE;
+}
+
+struct i915_sw_fence *heap_fence_create(gfp_t gfp)
+{
+	struct heap_fence *h;
+
+	h = kmalloc(sizeof(*h), gfp);
+	if (!h)
+		return NULL;
+
+	i915_sw_fence_init(&h->fence, heap_fence_notify);
+	refcount_set(&h->ref.refcount, 2);
+
+	return &h->fence;
+}
+
+static void heap_fence_release(struct kref *ref)
+{
+	struct heap_fence *h = container_of(ref, typeof(*h), ref);
+
+	i915_sw_fence_fini(&h->fence);
+
+	kfree_rcu(h, rcu);
+}
+
+void heap_fence_put(struct i915_sw_fence *fence)
+{
+	struct heap_fence *h = container_of(fence, typeof(*h), fence);
+
+	kref_put(&h->ref, heap_fence_release);
+}