| /* 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 */ | |
| __u8 expansion[76]; /* For future use */ | |
| }; | |
| #endif /* _KERNEL_DMA_BENCHMARK_H */ |