130 lines
2.8 KiB
C
130 lines
2.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2020 HiSilicon Limited.
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <linux/types.h>
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#include <linux/map_benchmark.h>
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#define NSEC_PER_MSEC 1000000L
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static char *directions[] = {
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"BIDIRECTIONAL",
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"TO_DEVICE",
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"FROM_DEVICE",
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};
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int main(int argc, char **argv)
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{
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struct map_benchmark map;
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int fd, opt;
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/* default single thread, run 20 seconds on NUMA_NO_NODE */
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int threads = 1, seconds = 20, node = -1;
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/* default dma mask 32bit, bidirectional DMA */
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int bits = 32, xdelay = 0, dir = DMA_MAP_BIDIRECTIONAL;
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/* default granule 1 PAGESIZE */
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int granule = 1;
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int cmd = DMA_MAP_BENCHMARK;
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char *p;
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while ((opt = getopt(argc, argv, "t:s:n:b:d:x:g:")) != -1) {
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switch (opt) {
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case 't':
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threads = atoi(optarg);
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break;
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case 's':
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seconds = atoi(optarg);
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break;
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case 'n':
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node = atoi(optarg);
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break;
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case 'b':
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bits = atoi(optarg);
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break;
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case 'd':
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dir = atoi(optarg);
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break;
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case 'x':
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xdelay = atoi(optarg);
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break;
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case 'g':
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granule = atoi(optarg);
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break;
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default:
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return -1;
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}
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}
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if (threads <= 0 || threads > DMA_MAP_MAX_THREADS) {
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fprintf(stderr, "invalid number of threads, must be in 1-%d\n",
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DMA_MAP_MAX_THREADS);
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exit(1);
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}
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if (seconds <= 0 || seconds > DMA_MAP_MAX_SECONDS) {
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fprintf(stderr, "invalid number of seconds, must be in 1-%d\n",
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DMA_MAP_MAX_SECONDS);
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exit(1);
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}
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if (xdelay < 0 || xdelay > DMA_MAP_MAX_TRANS_DELAY) {
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fprintf(stderr, "invalid transmit delay, must be in 0-%ld\n",
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DMA_MAP_MAX_TRANS_DELAY);
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exit(1);
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}
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/* suppose the mininum DMA zone is 1MB in the world */
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if (bits < 20 || bits > 64) {
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fprintf(stderr, "invalid dma mask bit, must be in 20-64\n");
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exit(1);
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}
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if (dir != DMA_MAP_BIDIRECTIONAL && dir != DMA_MAP_TO_DEVICE &&
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dir != DMA_MAP_FROM_DEVICE) {
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fprintf(stderr, "invalid dma direction\n");
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exit(1);
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}
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if (granule < 1 || granule > 1024) {
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fprintf(stderr, "invalid granule size\n");
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exit(1);
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}
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fd = open("/sys/kernel/debug/dma_map_benchmark", O_RDWR);
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if (fd == -1) {
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perror("open");
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exit(1);
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}
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memset(&map, 0, sizeof(map));
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map.seconds = seconds;
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map.threads = threads;
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map.node = node;
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map.dma_bits = bits;
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map.dma_dir = dir;
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map.dma_trans_ns = xdelay;
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map.granule = granule;
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if (ioctl(fd, cmd, &map)) {
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perror("ioctl");
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exit(1);
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}
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printf("dma mapping benchmark: threads:%d seconds:%d node:%d dir:%s granule: %d\n",
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threads, seconds, node, dir[directions], granule);
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printf("average map latency(us):%.1f standard deviation:%.1f\n",
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map.avg_map_100ns/10.0, map.map_stddev/10.0);
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printf("average unmap latency(us):%.1f standard deviation:%.1f\n",
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map.avg_unmap_100ns/10.0, map.unmap_stddev/10.0);
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return 0;
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}
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