/*
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* fence-array: aggregates fence to be waited together
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*
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* Copyright (C) 2016 Collabora Ltd
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* Copyright (C) 2016 Advanced Micro Devices, Inc.
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* Authors:
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* Gustavo Padovan <gustavo@padovan.org>
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* Christian König <christian.koenig@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#ifndef __LINUX_FENCE_ARRAY_H
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#define __LINUX_FENCE_ARRAY_H
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#include <linux/fence.h>
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/**
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* struct fence_array_cb - callback helper for fence array
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* @cb: fence callback structure for signaling
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* @array: reference to the parent fence array object
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*/
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struct fence_array_cb {
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struct fence_cb cb;
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struct fence_array *array;
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};
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/**
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* struct fence_array - fence to represent an array of fences
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* @base: fence base class
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* @lock: spinlock for fence handling
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* @num_fences: number of fences in the array
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* @num_pending: fences in the array still pending
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* @fences: array of the fences
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*/
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struct fence_array {
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struct fence base;
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spinlock_t lock;
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unsigned num_fences;
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atomic_t num_pending;
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struct fence **fences;
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};
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extern const struct fence_ops fence_array_ops;
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/**
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* fence_is_array - check if a fence is from the array subsclass
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*
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* Return true if it is a fence_array and false otherwise.
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*/
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static inline bool fence_is_array(struct fence *fence)
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{
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return fence->ops == &fence_array_ops;
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}
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/**
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* to_fence_array - cast a fence to a fence_array
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* @fence: fence to cast to a fence_array
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*
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* Returns NULL if the fence is not a fence_array,
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* or the fence_array otherwise.
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*/
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static inline struct fence_array *to_fence_array(struct fence *fence)
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{
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if (fence->ops != &fence_array_ops)
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return NULL;
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return container_of(fence, struct fence_array, base);
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}
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struct fence_array *fence_array_create(int num_fences, struct fence **fences,
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u64 context, unsigned seqno,
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bool signal_on_any);
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#endif /* __LINUX_FENCE_ARRAY_H */
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