1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * fence-array: aggregates fence to be waited together 4 * 5 * Copyright (C) 2016 Collabora Ltd 6 * Copyright (C) 2016 Advanced Micro Devices, Inc. 7 * Authors: 8 * Gustavo Padovan <gustavo@padovan.org> 9 * Christian König <christian.koenig@amd.com> 10 */ 11 12 #ifndef __LINUX_DMA_FENCE_ARRAY_H 13 #define __LINUX_DMA_FENCE_ARRAY_H 14 15 #include <linux/dma-fence.h> 16 #include <linux/irq_work.h> 17 18 /** 19 * struct dma_fence_array_cb - callback helper for fence array 20 * @cb: fence callback structure for signaling 21 * @array: reference to the parent fence array object 22 */ 23 struct dma_fence_array_cb { 24 struct dma_fence_cb cb; 25 struct dma_fence_array *array; 26 }; 27 28 /** 29 * struct dma_fence_array - fence to represent an array of fences 30 * @base: fence base class 31 * @lock: spinlock for fence handling 32 * @num_fences: number of fences in the array 33 * @num_pending: fences in the array still pending 34 * @fences: array of the fences 35 * @work: internal irq_work function 36 */ 37 struct dma_fence_array { 38 struct dma_fence base; 39 40 spinlock_t lock; 41 unsigned num_fences; 42 atomic_t num_pending; 43 struct dma_fence **fences; 44 45 struct irq_work work; 46 }; 47 48 extern const struct dma_fence_ops dma_fence_array_ops; 49 50 /** 51 * dma_fence_is_array - check if a fence is from the array subsclass 52 * @fence: fence to test 53 * 54 * Return true if it is a dma_fence_array and false otherwise. 55 */ dma_fence_is_array(struct dma_fence * fence)56static inline bool dma_fence_is_array(struct dma_fence *fence) 57 { 58 return fence->ops == &dma_fence_array_ops; 59 } 60 61 /** 62 * to_dma_fence_array - cast a fence to a dma_fence_array 63 * @fence: fence to cast to a dma_fence_array 64 * 65 * Returns NULL if the fence is not a dma_fence_array, 66 * or the dma_fence_array otherwise. 67 */ 68 static inline struct dma_fence_array * to_dma_fence_array(struct dma_fence * fence)69to_dma_fence_array(struct dma_fence *fence) 70 { 71 if (fence->ops != &dma_fence_array_ops) 72 return NULL; 73 74 return container_of(fence, struct dma_fence_array, base); 75 } 76 77 struct dma_fence_array *dma_fence_array_create(int num_fences, 78 struct dma_fence **fences, 79 u64 context, unsigned seqno, 80 bool signal_on_any); 81 82 bool dma_fence_match_context(struct dma_fence *fence, u64 context); 83 84 #endif /* __LINUX_DMA_FENCE_ARRAY_H */ 85