dma_map_benchmark.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2020 HiSilicon Limited.
  4 */
  5
  6#include <fcntl.h>
  7#include <stdio.h>
  8#include <stdlib.h>
  9#include <string.h>
 10#include <unistd.h>
 11#include <sys/ioctl.h>
 12#include <sys/mman.h>
 13#include <linux/map_benchmark.h>
 14
 15#define NSEC_PER_MSEC	1000000L
 16
 17static char *directions[] = {
 18	"BIDIRECTIONAL",
 19	"TO_DEVICE",
 20	"FROM_DEVICE",
 21};
 22
 23int main(int argc, char **argv)
 24{
 25	struct map_benchmark map;
 26	int fd, opt;
 27	/* default single thread, run 20 seconds on NUMA_NO_NODE */
 28	int threads = 1, seconds = 20, node = -1;
 29	/* default dma mask 32bit, bidirectional DMA */
 30	int bits = 32, xdelay = 0, dir = DMA_MAP_BIDIRECTIONAL;
 31	/* default granule 1 PAGESIZE */
 32	int granule = 1;
 33
 34	int cmd = DMA_MAP_BENCHMARK;
 35
 36	while ((opt = getopt(argc, argv, "t:s:n:b:d:x:g:")) != -1) {
 37		switch (opt) {
 38		case 't':
 39			threads = atoi(optarg);
 40			break;
 41		case 's':
 42			seconds = atoi(optarg);
 43			break;
 44		case 'n':
 45			node = atoi(optarg);
 46			break;
 47		case 'b':
 48			bits = atoi(optarg);
 49			break;
 50		case 'd':
 51			dir = atoi(optarg);
 52			break;
 53		case 'x':
 54			xdelay = atoi(optarg);
 55			break;
 56		case 'g':
 57			granule = atoi(optarg);
 58			break;
 59		default:
 60			return -1;
 61		}
 62	}
 63
 64	if (threads <= 0 || threads > DMA_MAP_MAX_THREADS) {
 65		fprintf(stderr, "invalid number of threads, must be in 1-%d\n",
 66			DMA_MAP_MAX_THREADS);
 67		exit(1);
 68	}
 69
 70	if (seconds <= 0 || seconds > DMA_MAP_MAX_SECONDS) {
 71		fprintf(stderr, "invalid number of seconds, must be in 1-%d\n",
 72			DMA_MAP_MAX_SECONDS);
 73		exit(1);
 74	}
 75
 76	if (xdelay < 0 || xdelay > DMA_MAP_MAX_TRANS_DELAY) {
 77		fprintf(stderr, "invalid transmit delay, must be in 0-%ld\n",
 78			DMA_MAP_MAX_TRANS_DELAY);
 79		exit(1);
 80	}
 81
 82	/* suppose the mininum DMA zone is 1MB in the world */
 83	if (bits < 20 || bits > 64) {
 84		fprintf(stderr, "invalid dma mask bit, must be in 20-64\n");
 85		exit(1);
 86	}
 87
 88	if (dir != DMA_MAP_BIDIRECTIONAL && dir != DMA_MAP_TO_DEVICE &&
 89			dir != DMA_MAP_FROM_DEVICE) {
 90		fprintf(stderr, "invalid dma direction\n");
 91		exit(1);
 92	}
 93
 94	if (granule < 1 || granule > 1024) {
 95		fprintf(stderr, "invalid granule size\n");
 96		exit(1);
 97	}
 98
 99	fd = open("/sys/kernel/debug/dma_map_benchmark", O_RDWR);
100	if (fd == -1) {
101		perror("open");
102		exit(1);
103	}
104
105	memset(&map, 0, sizeof(map));
106	map.seconds = seconds;
107	map.threads = threads;
108	map.node = node;
109	map.dma_bits = bits;
110	map.dma_dir = dir;
111	map.dma_trans_ns = xdelay;
112	map.granule = granule;
113
114	if (ioctl(fd, cmd, &map)) {
115		perror("ioctl");
116		exit(1);
117	}
118
119	printf("dma mapping benchmark: threads:%d seconds:%d node:%d dir:%s granule: %d\n",
120			threads, seconds, node, directions[dir], granule);
121	printf("average map latency(us):%.1f standard deviation:%.1f\n",
122			map.avg_map_100ns/10.0, map.map_stddev/10.0);
123	printf("average unmap latency(us):%.1f standard deviation:%.1f\n",
124			map.avg_unmap_100ns/10.0, map.unmap_stddev/10.0);
125
126	return 0;
127}