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