From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/gpu/drm/i915/i915_sw_fence.h | 123 +++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/i915_sw_fence.h

(limited to 'drivers/gpu/drm/i915/i915_sw_fence.h')

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 0000000000..f752bfc7c6
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_sw_fence.h
@@ -0,0 +1,123 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * i915_sw_fence.h - library routines for N:M synchronisation points
+ *
+ * Copyright (C) 2016 Intel Corporation
+ */
+
+#ifndef _I915_SW_FENCE_H_
+#define _I915_SW_FENCE_H_
+
+#include <linux/dma-fence.h>
+#include <linux/gfp.h>
+#include <linux/kref.h>
+#include <linux/notifier.h> /* for NOTIFY_DONE */
+#include <linux/wait.h>
+
+struct completion;
+struct dma_resv;
+struct i915_sw_fence;
+
+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);
+
+struct i915_sw_fence {
+	wait_queue_head_t wait;
+	i915_sw_fence_notify_t fn;
+#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG
+	unsigned long flags;
+#endif
+	atomic_t pending;
+	int error;
+};
+
+#define I915_SW_FENCE_CHECKED_BIT	0 /* used internally for DAG checking */
+
+void __i915_sw_fence_init(struct i915_sw_fence *fence,
+			  i915_sw_fence_notify_t fn,
+			  const char *name,
+			  struct lock_class_key *key);
+#ifdef CONFIG_LOCKDEP
+#define i915_sw_fence_init(fence, fn)				\
+do {								\
+	static struct lock_class_key __key;			\
+								\
+	BUILD_BUG_ON((fn) == NULL);				\
+	__i915_sw_fence_init((fence), (fn), #fence, &__key);	\
+} while (0)
+#else
+#define i915_sw_fence_init(fence, fn)				\
+do {								\
+	BUILD_BUG_ON((fn) == NULL);				\
+	__i915_sw_fence_init((fence), (fn), NULL, NULL);	\
+} while (0)
+#endif
+
+void i915_sw_fence_reinit(struct i915_sw_fence *fence);
+
+#ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
+void i915_sw_fence_fini(struct i915_sw_fence *fence);
+#else
+static inline void i915_sw_fence_fini(struct i915_sw_fence *fence) {}
+#endif
+
+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_entry_t *wq);
+int i915_sw_fence_await_sw_fence_gfp(struct i915_sw_fence *fence,
+				     struct i915_sw_fence *after,
+				     gfp_t gfp);
+
+struct i915_sw_dma_fence_cb {
+	struct dma_fence_cb base;
+	struct i915_sw_fence *fence;
+};
+
+int __i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
+				    struct dma_fence *dma,
+				    struct i915_sw_dma_fence_cb *cb);
+int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
+				  struct dma_fence *dma,
+				  unsigned long timeout,
+				  gfp_t gfp);
+
+int i915_sw_fence_await_reservation(struct i915_sw_fence *fence,
+				    struct dma_resv *resv,
+				    bool write,
+				    unsigned long timeout,
+				    gfp_t gfp);
+
+bool i915_sw_fence_await(struct i915_sw_fence *fence);
+void i915_sw_fence_complete(struct i915_sw_fence *fence);
+
+static inline bool i915_sw_fence_signaled(const struct i915_sw_fence *fence)
+{
+	return atomic_read(&fence->pending) <= 0;
+}
+
+static inline bool i915_sw_fence_done(const struct i915_sw_fence *fence)
+{
+	return atomic_read(&fence->pending) < 0;
+}
+
+static inline void i915_sw_fence_wait(struct i915_sw_fence *fence)
+{
+	wait_event(fence->wait, i915_sw_fence_done(fence));
+}
+
+static inline void
+i915_sw_fence_set_error_once(struct i915_sw_fence *fence, int error)
+{
+	if (unlikely(error))
+		cmpxchg(&fence->error, 0, error);
+}
+
+#endif /* _I915_SW_FENCE_H_ */
-- 
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