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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note *//* * Copyright (C) 2022-2025 HiSilicon Limited. */
#ifndef _UAPI_DMA_BENCHMARK_H#define _UAPI_DMA_BENCHMARK_H
#include <linux/types.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
enum { DMA_MAP_BENCH_SINGLE_MODE, DMA_MAP_BENCH_SG_MODE, DMA_MAP_BENCH_MODE_MAX};
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; /* - SINGLE_MODE: number of pages mapped/unmapped per operation * - SG_MODE: number of scatterlist entries (each maps one page) */ __u8 map_mode; /* the mode of dma map */ __u8 expansion[75]; /* For future use */};
#endif /* _UAPI_DMA_BENCHMARK_H */