Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
2/*
3 * Copyright (C) 2022-2025 HiSilicon Limited.
4 */
5
6#ifndef _UAPI_DMA_BENCHMARK_H
7#define _UAPI_DMA_BENCHMARK_H
8
9#include <linux/types.h>
10
11#define DMA_MAP_BENCHMARK _IOWR('d', 1, struct map_benchmark)
12#define DMA_MAP_MAX_THREADS 1024
13#define DMA_MAP_MAX_SECONDS 300
14#define DMA_MAP_MAX_TRANS_DELAY (10 * NSEC_PER_MSEC)
15
16#define DMA_MAP_BIDIRECTIONAL 0
17#define DMA_MAP_TO_DEVICE 1
18#define DMA_MAP_FROM_DEVICE 2
19
20struct map_benchmark {
21 __u64 avg_map_100ns; /* average map latency in 100ns */
22 __u64 map_stddev; /* standard deviation of map latency */
23 __u64 avg_unmap_100ns; /* as above */
24 __u64 unmap_stddev;
25 __u32 threads; /* how many threads will do map/unmap in parallel */
26 __u32 seconds; /* how long the test will last */
27 __s32 node; /* which numa node this benchmark will run on */
28 __u32 dma_bits; /* DMA addressing capability */
29 __u32 dma_dir; /* DMA data direction */
30 __u32 dma_trans_ns; /* time for DMA transmission in ns */
31 __u32 granule; /* how many PAGE_SIZE will do map/unmap once a time */
32 __u8 expansion[76]; /* For future use */
33};
34
35#endif /* _UAPI_DMA_BENCHMARK_H */