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#include <linux/irq_work.h> 25 26/** 27 * struct dma_fence_array_cb - callback helper for fence array 28 * @cb: fence callback structure for signaling 29 * @array: reference to the parent fence array object 30 */ 31struct dma_fence_array_cb { 32 struct dma_fence_cb cb; 33 struct dma_fence_array *array; 34}; 35 36/** 37 * struct dma_fence_array - fence to represent an array of fences 38 * @base: fence base class 39 * @lock: spinlock for fence handling 40 * @num_fences: number of fences in the array 41 * @num_pending: fences in the array still pending 42 * @fences: array of the fences 43 * @work: internal irq_work function 44 */ 45struct dma_fence_array { 46 struct dma_fence base; 47 48 spinlock_t lock; 49 unsigned num_fences; 50 atomic_t num_pending; 51 struct dma_fence **fences; 52 53 struct irq_work work; 54}; 55 56extern const struct dma_fence_ops dma_fence_array_ops; 57 58/** 59 * dma_fence_is_array - check if a fence is from the array subsclass 60 * @fence: fence to test 61 * 62 * Return true if it is a dma_fence_array and false otherwise. 63 */ 64static inline bool dma_fence_is_array(struct dma_fence *fence) 65{ 66 return fence->ops == &dma_fence_array_ops; 67} 68 69/** 70 * to_dma_fence_array - cast a fence to a dma_fence_array 71 * @fence: fence to cast to a dma_fence_array 72 * 73 * Returns NULL if the fence is not a dma_fence_array, 74 * or the dma_fence_array otherwise. 75 */ 76static inline struct dma_fence_array * 77to_dma_fence_array(struct dma_fence *fence) 78{ 79 if (fence->ops != &dma_fence_array_ops) 80 return NULL; 81 82 return container_of(fence, struct dma_fence_array, base); 83} 84 85struct dma_fence_array *dma_fence_array_create(int num_fences, 86 struct dma_fence **fences, 87 u64 context, unsigned seqno, 88 bool signal_on_any); 89 90bool dma_fence_match_context(struct dma_fence *fence, u64 context); 91 92#endif /* __LINUX_DMA_FENCE_ARRAY_H */ 93