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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_FENCE_ARRAY_H
#define __LINUX_FENCE_ARRAY_H
#include <linux/fence.h>
/**
* struct fence_array_cb - callback helper for fence array
* @cb: fence callback structure for signaling
* @array: reference to the parent fence array object
*/
struct fence_array_cb {
struct fence_cb cb;
struct fence_array *array;
};
/**
* struct 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 fence_array {
struct fence base;
spinlock_t lock;
unsigned num_fences;
atomic_t num_pending;
struct fence **fences;
};
extern const struct fence_ops fence_array_ops;
/**
* fence_is_array - check if a fence is from the array subsclass
* @fence: fence to test
*
* Return true if it is a fence_array and false otherwise.
*/
static inline bool fence_is_array(struct fence *fence)
{
return fence->ops == &fence_array_ops;
}
/**
* to_fence_array - cast a fence to a fence_array
* @fence: fence to cast to a fence_array
*
* Returns NULL if the fence is not a fence_array,
* or the fence_array otherwise.
*/
static inline struct fence_array *to_fence_array(struct fence *fence)
{
if (fence->ops != &fence_array_ops)
return NULL;
return container_of(fence, struct fence_array, base);
}
struct fence_array *fence_array_create(int num_fences, struct fence **fences,
u64 context, unsigned seqno,
bool signal_on_any);
#endif /* __LINUX_FENCE_ARRAY_H */
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