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/types.h>
14 #include <linux/map_benchmark.h>
15
16 #define NSEC_PER_MSEC 1000000L
17
18 static char *directions[] = {
19 "BIDIRECTIONAL",
20 "TO_DEVICE",
21 "FROM_DEVICE",
22 };
23
24 int main(int argc, char **argv)
25 {
26 struct map_benchmark map;
27 int fd, opt;
28 /* default single thread, run 20 seconds on NUMA_NO_NODE */
29 int threads = 1, seconds = 20, node = -1;
30 /* default dma mask 32bit, bidirectional DMA */
31 int bits = 32, xdelay = 0, dir = DMA_MAP_BIDIRECTIONAL;
32 /* default granule 1 PAGESIZE */
33 int granule = 1;
34
35 int cmd = DMA_MAP_BENCHMARK;
36
37 while ((opt = getopt(argc, argv, "t:s:n:b:d:x:g:")) != -1) {
38 switch (opt) {
39 case 't':
40 threads = atoi(optarg);
41 break;
42 case 's':
43 seconds = atoi(optarg);
44 break;
45 case 'n':
46 node = atoi(optarg);
47 break;
48 case 'b':
49 bits = atoi(optarg);
50 break;
51 case 'd':
52 dir = atoi(optarg);
53 break;
54 case 'x':
55 xdelay = atoi(optarg);
56 break;
57 case 'g':
58 granule = atoi(optarg);
59 break;
60 default:
61 return -1;
62 }
63 }
64
65 if (threads <= 0 || threads > DMA_MAP_MAX_THREADS) {
66 fprintf(stderr, "invalid number of threads, must be in 1-%d\n",
67 DMA_MAP_MAX_THREADS);
68 exit(1);
69 }
70
71 if (seconds <= 0 || seconds > DMA_MAP_MAX_SECONDS) {
72 fprintf(stderr, "invalid number of seconds, must be in 1-%d\n",
73 DMA_MAP_MAX_SECONDS);
74 exit(1);
75 }
76
77 if (xdelay < 0 || xdelay > DMA_MAP_MAX_TRANS_DELAY) {
78 fprintf(stderr, "invalid transmit delay, must be in 0-%ld\n",
79 DMA_MAP_MAX_TRANS_DELAY);
80 exit(1);
81 }
82
83 /* suppose the mininum DMA zone is 1MB in the world */
84 if (bits < 20 || bits > 64) {
85 fprintf(stderr, "invalid dma mask bit, must be in 20-64\n");
86 exit(1);
87 }
88
89 if (dir != DMA_MAP_BIDIRECTIONAL && dir != DMA_MAP_TO_DEVICE &&
90 dir != DMA_MAP_FROM_DEVICE) {
91 fprintf(stderr, "invalid dma direction\n");
92 exit(1);
93 }
94
95 if (granule < 1 || granule > 1024) {
96 fprintf(stderr, "invalid granule size\n");
97 exit(1);
98 }
99
100 fd = open("/sys/kernel/debug/dma_map_benchmark", O_RDWR);
101 if (fd == -1) {
102 perror("open");
103 exit(1);
104 }
105
106 memset(&map, 0, sizeof(map));
107 map.seconds = seconds;
108 map.threads = threads;
109 map.node = node;
110 map.dma_bits = bits;
111 map.dma_dir = dir;
112 map.dma_trans_ns = xdelay;
113 map.granule = granule;
114
115 if (ioctl(fd, cmd, &map)) {
116 perror("ioctl");
117 exit(1);
118 }
119
120 printf("dma mapping benchmark: threads:%d seconds:%d node:%d dir:%s granule: %d\n",
121 threads, seconds, node, dir[directions], granule);
122 printf("average map latency(us):%.1f standard deviation:%.1f\n",
123 map.avg_map_100ns/10.0, map.map_stddev/10.0);
124 printf("average unmap latency(us):%.1f standard deviation:%.1f\n",
125 map.avg_unmap_100ns/10.0, map.unmap_stddev/10.0);
126
127 return 0;
128 }
129
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.