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 15 #define DMA_MAP_BENCHMARK _IOWR('d', 1, struct map_benchmark) 16 #define DMA_MAP_MAX_THREADS 1024 17 #define DMA_MAP_MAX_SECONDS 300 18 19 #define DMA_MAP_BIDIRECTIONAL 0 20 #define DMA_MAP_TO_DEVICE 1 21 #define DMA_MAP_FROM_DEVICE 2 22 23 static char *directions[] = { 24 "BIDIRECTIONAL", 25 "TO_DEVICE", 26 "FROM_DEVICE", 27 }; 28 29 struct map_benchmark { 30 __u64 avg_map_100ns; /* average map latency in 100ns */ 31 __u64 map_stddev; /* standard deviation of map latency */ 32 __u64 avg_unmap_100ns; /* as above */ 33 __u64 unmap_stddev; 34 __u32 threads; /* how many threads will do map/unmap in parallel */ 35 __u32 seconds; /* how long the test will last */ 36 __s32 node; /* which numa node this benchmark will run on */ 37 __u32 dma_bits; /* DMA addressing capability */ 38 __u32 dma_dir; /* DMA data direction */ 39 __u8 expansion[84]; /* For future use */ 40 }; 41 42 int main(int argc, char **argv) 43 { 44 struct map_benchmark map; 45 int fd, opt; 46 /* default single thread, run 20 seconds on NUMA_NO_NODE */ 47 int threads = 1, seconds = 20, node = -1; 48 /* default dma mask 32bit, bidirectional DMA */ 49 int bits = 32, dir = DMA_MAP_BIDIRECTIONAL; 50 51 int cmd = DMA_MAP_BENCHMARK; 52 char *p; 53 54 while ((opt = getopt(argc, argv, "t:s:n:b:d:")) != -1) { 55 switch (opt) { 56 case 't': 57 threads = atoi(optarg); 58 break; 59 case 's': 60 seconds = atoi(optarg); 61 break; 62 case 'n': 63 node = atoi(optarg); 64 break; 65 case 'b': 66 bits = atoi(optarg); 67 break; 68 case 'd': 69 dir = atoi(optarg); 70 break; 71 default: 72 return -1; 73 } 74 } 75 76 if (threads <= 0 || threads > DMA_MAP_MAX_THREADS) { 77 fprintf(stderr, "invalid number of threads, must be in 1-%d\n", 78 DMA_MAP_MAX_THREADS); 79 exit(1); 80 } 81 82 if (seconds <= 0 || seconds > DMA_MAP_MAX_SECONDS) { 83 fprintf(stderr, "invalid number of seconds, must be in 1-%d\n", 84 DMA_MAP_MAX_SECONDS); 85 exit(1); 86 } 87 88 /* suppose the mininum DMA zone is 1MB in the world */ 89 if (bits < 20 || bits > 64) { 90 fprintf(stderr, "invalid dma mask bit, must be in 20-64\n"); 91 exit(1); 92 } 93 94 if (dir != DMA_MAP_BIDIRECTIONAL && dir != DMA_MAP_TO_DEVICE && 95 dir != DMA_MAP_FROM_DEVICE) { 96 fprintf(stderr, "invalid dma direction\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 if (ioctl(fd, cmd, &map)) { 113 perror("ioctl"); 114 exit(1); 115 } 116 117 printf("dma mapping benchmark: threads:%d seconds:%d node:%d dir:%s\n", 118 threads, seconds, node, dir[directions]); 119 printf("average map latency(us):%.1f standard deviation:%.1f\n", 120 map.avg_map_100ns/10.0, map.map_stddev/10.0); 121 printf("average unmap latency(us):%.1f standard deviation:%.1f\n", 122 map.avg_unmap_100ns/10.0, map.unmap_stddev/10.0); 123 124 return 0; 125 } 126