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