map_benchmark.h

 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 */