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-rw-r--r--include/linux/dma-fence-array.h86
1 files changed, 86 insertions, 0 deletions
diff --git a/include/linux/dma-fence-array.h b/include/linux/dma-fence-array.h
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+++ b/include/linux/dma-fence-array.h
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+/*
+ * fence-array: aggregates fence to be waited together
+ *
+ * Copyright (C) 2016 Collabora Ltd
+ * Copyright (C) 2016 Advanced Micro Devices, Inc.
+ * Authors:
+ * Gustavo Padovan <gustavo@padovan.org>
+ * Christian König <christian.koenig@amd.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.
+ */
+
+#ifndef __LINUX_DMA_FENCE_ARRAY_H
+#define __LINUX_DMA_FENCE_ARRAY_H
+
+#include <linux/dma-fence.h>
+
+/**
+ * struct dma_fence_array_cb - callback helper for fence array
+ * @cb: fence callback structure for signaling
+ * @array: reference to the parent fence array object
+ */
+struct dma_fence_array_cb {
+ struct dma_fence_cb cb;
+ struct dma_fence_array *array;
+};
+
+/**
+ * struct dma_fence_array - fence to represent an array of fences
+ * @base: fence base class
+ * @lock: spinlock for fence handling
+ * @num_fences: number of fences in the array
+ * @num_pending: fences in the array still pending
+ * @fences: array of the fences
+ */
+struct dma_fence_array {
+ struct dma_fence base;
+
+ spinlock_t lock;
+ unsigned num_fences;
+ atomic_t num_pending;
+ struct dma_fence **fences;
+};
+
+extern const struct dma_fence_ops dma_fence_array_ops;
+
+/**
+ * dma_fence_is_array - check if a fence is from the array subsclass
+ * @fence: fence to test
+ *
+ * Return true if it is a dma_fence_array and false otherwise.
+ */
+static inline bool dma_fence_is_array(struct dma_fence *fence)
+{
+ return fence->ops == &dma_fence_array_ops;
+}
+
+/**
+ * to_dma_fence_array - cast a fence to a dma_fence_array
+ * @fence: fence to cast to a dma_fence_array
+ *
+ * Returns NULL if the fence is not a dma_fence_array,
+ * or the dma_fence_array otherwise.
+ */
+static inline struct dma_fence_array *
+to_dma_fence_array(struct dma_fence *fence)
+{
+ if (fence->ops != &dma_fence_array_ops)
+ return NULL;
+
+ return container_of(fence, struct dma_fence_array, base);
+}
+
+struct dma_fence_array *dma_fence_array_create(int num_fences,
+ struct dma_fence **fences,
+ u64 context, unsigned seqno,
+ bool signal_on_any);
+
+#endif /* __LINUX_DMA_FENCE_ARRAY_H */