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