Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
20enum {
21 DMA_MAP_BENCH_SINGLE_MODE,
22 DMA_MAP_BENCH_SG_MODE,
23 DMA_MAP_BENCH_MODE_MAX
24};
25
26struct map_benchmark {
27 __u64 avg_map_100ns; /* average map latency in 100ns */
28 __u64 map_stddev; /* standard deviation of map latency */
29 __u64 avg_unmap_100ns; /* as above */
30 __u64 unmap_stddev;
31 __u32 threads; /* how many threads will do map/unmap in parallel */
32 __u32 seconds; /* how long the test will last */
33 __s32 node; /* which numa node this benchmark will run on */
34 __u32 dma_bits; /* DMA addressing capability */
35 __u32 dma_dir; /* DMA data direction */
36 __u32 dma_trans_ns; /* time for DMA transmission in ns */
37 __u32 granule; /* - SINGLE_MODE: number of pages mapped/unmapped per operation
38 * - SG_MODE: number of scatterlist entries (each maps one page)
39 */
40 __u8 map_mode; /* the mode of dma map */
41 __u8 expansion[75]; /* For future use */
42};
43
44#endif /* _UAPI_DMA_BENCHMARK_H */