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 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