1/* 2 * fence-array: aggregates fence to be waited together 3 * 4 * Copyright (C) 2016 Collabora Ltd 5 * Copyright (C) 2016 Advanced Micro Devices, Inc. 6 * Authors: 7 * Gustavo Padovan <gustavo@padovan.org> 8 * Christian König <christian.koenig@amd.com> 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License version 2 as published by 12 * the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, but WITHOUT 15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 17 * more details. 18 */ 19 20#ifndef __LINUX_DMA_FENCE_ARRAY_H 21#define __LINUX_DMA_FENCE_ARRAY_H 22 23#include <linux/dma-fence.h> 24 25/** 26 * struct dma_fence_array_cb - callback helper for fence array 27 * @cb: fence callback structure for signaling 28 * @array: reference to the parent fence array object 29 */ 30struct dma_fence_array_cb { 31 struct dma_fence_cb cb; 32 struct dma_fence_array *array; 33}; 34 35/** 36 * struct dma_fence_array - fence to represent an array of fences 37 * @base: fence base class 38 * @lock: spinlock for fence handling 39 * @num_fences: number of fences in the array 40 * @num_pending: fences in the array still pending 41 * @fences: array of the fences 42 */ 43struct dma_fence_array { 44 struct dma_fence base; 45 46 spinlock_t lock; 47 unsigned num_fences; 48 atomic_t num_pending; 49 struct dma_fence **fences; 50}; 51 52extern const struct dma_fence_ops dma_fence_array_ops; 53 54/** 55 * dma_fence_is_array - check if a fence is from the array subsclass 56 * @fence: fence to test 57 * 58 * Return true if it is a dma_fence_array and false otherwise. 59 */ 60static inline bool dma_fence_is_array(struct dma_fence *fence) 61{ 62 return fence->ops == &dma_fence_array_ops; 63} 64 65/** 66 * to_dma_fence_array - cast a fence to a dma_fence_array 67 * @fence: fence to cast to a dma_fence_array 68 * 69 * Returns NULL if the fence is not a dma_fence_array, 70 * or the dma_fence_array otherwise. 71 */ 72static inline struct dma_fence_array * 73to_dma_fence_array(struct dma_fence *fence) 74{ 75 if (fence->ops != &dma_fence_array_ops) 76 return NULL; 77 78 return container_of(fence, struct dma_fence_array, base); 79} 80 81struct dma_fence_array *dma_fence_array_create(int num_fences, 82 struct dma_fence **fences, 83 u64 context, unsigned seqno, 84 bool signal_on_any); 85 86bool dma_fence_match_context(struct dma_fence *fence, u64 context); 87 88#endif /* __LINUX_DMA_FENCE_ARRAY_H */ 89