projects/linux·blob master · refs

144 lines · 3.2 KiB

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
23static char *mode[] = {
24 "SINGLE_MODE",
25 "SG_MODE",
26};
27
28int main(int argc, char **argv)
29{
30 struct map_benchmark map;
31 int fd, opt;
32 /* default single thread, run 20 seconds on NUMA_NO_NODE */
33 int threads = 1, seconds = 20, node = -1;
34 /* default single map mode */
35 int map_mode = DMA_MAP_BENCH_SINGLE_MODE;
36 /* default dma mask 32bit, bidirectional DMA */
37 int bits = 32, xdelay = 0, dir = DMA_MAP_BIDIRECTIONAL;
38 /* default granule 1 PAGESIZE */
39 int granule = 1;
40
41 int cmd = DMA_MAP_BENCHMARK;
42
43 while ((opt = getopt(argc, argv, "t:s:n:b:d:x:g:m:")) != -1) {
44 switch (opt) {
45 case 't':
46 threads = atoi(optarg);
47 break;
48 case 's':
49 seconds = atoi(optarg);
50 break;
51 case 'n':
52 node = atoi(optarg);
53 break;
54 case 'b':
55 bits = atoi(optarg);
56 break;
57 case 'd':
58 dir = atoi(optarg);
59 break;
60 case 'x':
61 xdelay = atoi(optarg);
62 break;
63 case 'g':
64 granule = atoi(optarg);
65 break;
66 case 'm':
67 map_mode = atoi(optarg);
68 break;
69 default:
70 return -1;
71 }
72 }
73
74 if (map_mode < 0 || map_mode >= DMA_MAP_BENCH_MODE_MAX) {
75 fprintf(stderr, "invalid map mode, SINGLE_MODE:%d, SG_MODE: %d\n",
76 DMA_MAP_BENCH_SINGLE_MODE, DMA_MAP_BENCH_SG_MODE);
77 exit(1);
78 }
79
80 if (threads <= 0 || threads > DMA_MAP_MAX_THREADS) {
81 fprintf(stderr, "invalid number of threads, must be in 1-%d\n",
82 DMA_MAP_MAX_THREADS);
83 exit(1);
84 }
85
86 if (seconds <= 0 || seconds > DMA_MAP_MAX_SECONDS) {
87 fprintf(stderr, "invalid number of seconds, must be in 1-%d\n",
88 DMA_MAP_MAX_SECONDS);
89 exit(1);
90 }
91
92 if (xdelay < 0 || xdelay > DMA_MAP_MAX_TRANS_DELAY) {
93 fprintf(stderr, "invalid transmit delay, must be in 0-%ld\n",
94 DMA_MAP_MAX_TRANS_DELAY);
95 exit(1);
96 }
97
98 /* suppose the mininum DMA zone is 1MB in the world */
99 if (bits < 20 || bits > 64) {
100 fprintf(stderr, "invalid dma mask bit, must be in 20-64\n");
101 exit(1);
102 }
103
104 if (dir != DMA_MAP_BIDIRECTIONAL && dir != DMA_MAP_TO_DEVICE &&
105 dir != DMA_MAP_FROM_DEVICE) {
106 fprintf(stderr, "invalid dma direction\n");
107 exit(1);
108 }
109
110 if (granule < 1 || granule > 1024) {
111 fprintf(stderr, "invalid granule size\n");
112 exit(1);
113 }
114
115 fd = open("/sys/kernel/debug/dma_map_benchmark", O_RDWR);
116 if (fd == -1) {
117 perror("open");
118 exit(1);
119 }
120
121 memset(&map, 0, sizeof(map));
122 map.seconds = seconds;
123 map.threads = threads;
124 map.node = node;
125 map.dma_bits = bits;
126 map.dma_dir = dir;
127 map.dma_trans_ns = xdelay;
128 map.granule = granule;
129 map.map_mode = map_mode;
130
131 if (ioctl(fd, cmd, &map)) {
132 perror("ioctl");
133 exit(1);
134 }
135
136 printf("dma mapping benchmark(%s): threads:%d seconds:%d node:%d dir:%s granule:%d\n",
137 mode[map_mode], threads, seconds, node, directions[dir], granule);
138 printf("average map latency(us):%.1f standard deviation:%.1f\n",
139 map.avg_map_100ns/10.0, map.map_stddev/10.0);
140 printf("average unmap latency(us):%.1f standard deviation:%.1f\n",
141 map.avg_unmap_100ns/10.0, map.unmap_stddev/10.0);
142
143 return 0;
144}