/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2022 HiSilicon Limited. */ #ifndef _KERNEL_DMA_BENCHMARK_H #define _KERNEL_DMA_BENCHMARK_H #define DMA_MAP_BENCHMARK _IOWR('d', 1, struct map_benchmark) #define DMA_MAP_MAX_THREADS 1024 #define DMA_MAP_MAX_SECONDS 300 #define DMA_MAP_MAX_TRANS_DELAY (10 * NSEC_PER_MSEC) #define DMA_MAP_BIDIRECTIONAL 0 #define DMA_MAP_TO_DEVICE 1 #define DMA_MAP_FROM_DEVICE 2 struct map_benchmark { __u64 avg_map_100ns; /* average map latency in 100ns */ __u64 map_stddev; /* standard deviation of map latency */ __u64 avg_unmap_100ns; /* as above */ __u64 unmap_stddev; __u32 threads; /* how many threads will do map/unmap in parallel */ __u32 seconds; /* how long the test will last */ __s32 node; /* which numa node this benchmark will run on */ __u32 dma_bits; /* DMA addressing capability */ __u32 dma_dir; /* DMA data direction */ __u32 dma_trans_ns; /* time for DMA transmission in ns */ __u32 granule; /* how many PAGE_SIZE will do map/unmap once a time */ }; #endif /* _KERNEL_DMA_BENCHMARK_H */