1 files changed, 65 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_sw_fence.h b/drivers/gpu/drm/i915/i915_sw_fence.h
new file mode 100644
index 000000000000..373141602ca4
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_sw_fence.h
@@ -0,0 +1,65 @@
+/*
+ * i915_sw_fence.h - library routines for N:M synchronisation points
+ *
+ * Copyright (C) 2016 Intel Corporation
+ *
+ * This file is released under the GPLv2.
+ *
+ */
+
+#ifndef _I915_SW_FENCE_H_
+#define _I915_SW_FENCE_H_
+
+#include <linux/gfp.h>
+#include <linux/kref.h>
+#include <linux/notifier.h> /* for NOTIFY_DONE */
+#include <linux/wait.h>
+
+struct completion;
+struct fence;
+struct fence_ops;
+struct reservation_object;
+
+struct i915_sw_fence {
+	wait_queue_head_t wait;
+	unsigned long flags;
+	struct kref kref;
+	atomic_t pending;
+};
+
+#define I915_SW_FENCE_CHECKED_BIT	0 /* used internally for DAG checking */
+#define I915_SW_FENCE_PRIVATE_BIT	1 /* available for use by owner */
+#define I915_SW_FENCE_MASK		(~3)
+
+enum i915_sw_fence_notify {
+	FENCE_COMPLETE,
+	FENCE_FREE
+};
+
+typedef int (*i915_sw_fence_notify_t)(struct i915_sw_fence *,
+				      enum i915_sw_fence_notify state);
+#define __i915_sw_fence_call __aligned(4)
+
+void i915_sw_fence_init(struct i915_sw_fence *fence, i915_sw_fence_notify_t fn);
+void i915_sw_fence_commit(struct i915_sw_fence *fence);
+
+int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
+				 struct i915_sw_fence *after,
+				 wait_queue_t *wq);
+int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
+				  struct fence *dma,
+				  unsigned long timeout,
+				  gfp_t gfp);
+int i915_sw_fence_await_reservation(struct i915_sw_fence *fence,
+				    struct reservation_object *resv,
+				    const struct fence_ops *exclude,
+				    bool write,
+				    unsigned long timeout,
+				    gfp_t gfp);
+
+static inline bool i915_sw_fence_done(const struct i915_sw_fence *fence)
+{
+	return atomic_read(&fence->pending) < 0;
+}
+
+#endif /* _I915_SW_FENCE_H_ */