LXR linux/tools/testing/selftests/dma/dma_map

   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 NSEC_PER_MSEC   1000000L
  16
  17#define DMA_MAP_BENCHMARK       _IOWR('d', 1, struct map_benchmark)
  18#define DMA_MAP_MAX_THREADS     1024
  19#define DMA_MAP_MAX_SECONDS     300
  20#define DMA_MAP_MAX_TRANS_DELAY (10 * NSEC_PER_MSEC)
  21
  22#define DMA_MAP_BIDIRECTIONAL   0
  23#define DMA_MAP_TO_DEVICE       1
  24#define DMA_MAP_FROM_DEVICE     2
  25
  26static char *directions[] = {
  27        "BIDIRECTIONAL",
  28        "TO_DEVICE",
  29        "FROM_DEVICE",
  30};
  31
  32struct map_benchmark {
  33        __u64 avg_map_100ns; /* average map latency in 100ns */
  34        __u64 map_stddev; /* standard deviation of map latency */
  35        __u64 avg_unmap_100ns; /* as above */
  36        __u64 unmap_stddev;
  37        __u32 threads; /* how many threads will do map/unmap in parallel */
  38        __u32 seconds; /* how long the test will last */
  39        __s32 node; /* which numa node this benchmark will run on */
  40        __u32 dma_bits; /* DMA addressing capability */
  41        __u32 dma_dir; /* DMA data direction */
  42        __u32 dma_trans_ns; /* time for DMA transmission in ns */
  43        __u32 granule; /* how many PAGE_SIZE will do map/unmap once a time */
  44        __u8 expansion[76];     /* For future use */
  45};
  46
  47int main(int argc, char **argv)
  48{
  49        struct map_benchmark map;
  50        int fd, opt;
  51        /* default single thread, run 20 seconds on NUMA_NO_NODE */
  52        int threads = 1, seconds = 20, node = -1;
  53        /* default dma mask 32bit, bidirectional DMA */
  54        int bits = 32, xdelay = 0, dir = DMA_MAP_BIDIRECTIONAL;
  55        /* default granule 1 PAGESIZE */
  56        int granule = 1;
  57
  58        int cmd = DMA_MAP_BENCHMARK;
  59        char *p;
  60
  61        while ((opt = getopt(argc, argv, "t:s:n:b:d:x:g:")) != -1) {
  62                switch (opt) {
  63                case 't':
  64                        threads = atoi(optarg);
  65                        break;
  66                case 's':
  67                        seconds = atoi(optarg);
  68                        break;
  69                case 'n':
  70                        node = atoi(optarg);
  71                        break;
  72                case 'b':
  73                        bits = atoi(optarg);
  74                        break;
  75                case 'd':
  76                        dir = atoi(optarg);
  77                        break;
  78                case 'x':
  79                        xdelay = atoi(optarg);
  80                        break;
  81                case 'g':
  82                        granule = atoi(optarg);
  83                        break;
  84                default:
  85                        return -1;
  86                }
  87        }
  88
  89        if (threads <= 0 || threads > DMA_MAP_MAX_THREADS) {
  90                fprintf(stderr, "invalid number of threads, must be in 1-%d\n",
  91                        DMA_MAP_MAX_THREADS);
  92                exit(1);
  93        }
  94
  95        if (seconds <= 0 || seconds > DMA_MAP_MAX_SECONDS) {
  96                fprintf(stderr, "invalid number of seconds, must be in 1-%d\n",
  97                        DMA_MAP_MAX_SECONDS);
  98                exit(1);
  99        }
 100
 101        if (xdelay < 0 || xdelay > DMA_MAP_MAX_TRANS_DELAY) {
 102                fprintf(stderr, "invalid transmit delay, must be in 0-%ld\n",
 103                        DMA_MAP_MAX_TRANS_DELAY);
 104                exit(1);
 105        }
 106
 107        /* suppose the mininum DMA zone is 1MB in the world */
 108        if (bits < 20 || bits > 64) {
 109                fprintf(stderr, "invalid dma mask bit, must be in 20-64\n");
 110                exit(1);
 111        }
 112
 113        if (dir != DMA_MAP_BIDIRECTIONAL && dir != DMA_MAP_TO_DEVICE &&
 114                        dir != DMA_MAP_FROM_DEVICE) {
 115                fprintf(stderr, "invalid dma direction\n");
 116                exit(1);
 117        }
 118
 119        if (granule < 1 || granule > 1024) {
 120                fprintf(stderr, "invalid granule size\n");
 121                exit(1);
 122        }
 123
 124        fd = open("/sys/kernel/debug/dma_map_benchmark", O_RDWR);
 125        if (fd == -1) {
 126                perror("open");
 127                exit(1);
 128        }
 129
 130        memset(&map, 0, sizeof(map));
 131        map.seconds = seconds;
 132        map.threads = threads;
 133        map.node = node;
 134        map.dma_bits = bits;
 135        map.dma_dir = dir;
 136        map.dma_trans_ns = xdelay;
 137        map.granule = granule;
 138
 139        if (ioctl(fd, cmd, &map)) {
 140                perror("ioctl");
 141                exit(1);
 142        }
 143
 144        printf("dma mapping benchmark: threads:%d seconds:%d node:%d dir:%s granule: %d\n",
 145                        threads, seconds, node, dir[directions], granule);
 146        printf("average map latency(us):%.1f standard deviation:%.1f\n",
 147                        map.avg_map_100ns/10.0, map.map_stddev/10.0);
 148        printf("average unmap latency(us):%.1f standard deviation:%.1f\n",
 149                        map.avg_unmap_100ns/10.0, map.unmap_stddev/10.0);
 150
 151        return 0;
 152}
 153