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