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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020 Hisilicon Limited.
*/
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/types.h>
#define DMA_MAP_BENCHMARK _IOWR('d', 1, struct map_benchmark)
#define DMA_MAP_MAX_THREADS 1024
#define DMA_MAP_MAX_SECONDS 300
#define DMA_MAP_BIDIRECTIONAL 0
#define DMA_MAP_TO_DEVICE 1
#define DMA_MAP_FROM_DEVICE 2
static char *directions[] = {
"BIDIRECTIONAL",
"TO_DEVICE",
"FROM_DEVICE",
};
struct map_benchmark {
__u64 avg_map_100ns; /* average map latency in 100ns */
__u64 map_stddev; /* standard deviation of map latency */
__u64 avg_unmap_100ns; /* as above */
__u64 unmap_stddev;
__u32 threads; /* how many threads will do map/unmap in parallel */
__u32 seconds; /* how long the test will last */
__s32 node; /* which numa node this benchmark will run on */
__u32 dma_bits; /* DMA addressing capability */
__u32 dma_dir; /* DMA data direction */
__u64 expansion[10]; /* For future use */
};
int main(int argc, char **argv)
{
struct map_benchmark map;
int fd, opt;
/* default single thread, run 20 seconds on NUMA_NO_NODE */
int threads = 1, seconds = 20, node = -1;
/* default dma mask 32bit, bidirectional DMA */
int bits = 32, dir = DMA_MAP_BIDIRECTIONAL;
int cmd = DMA_MAP_BENCHMARK;
char *p;
while ((opt = getopt(argc, argv, "t:s:n:b:d:")) != -1) {
switch (opt) {
case 't':
threads = atoi(optarg);
break;
case 's':
seconds = atoi(optarg);
break;
case 'n':
node = atoi(optarg);
break;
case 'b':
bits = atoi(optarg);
break;
case 'd':
dir = atoi(optarg);
break;
default:
return -1;
}
}
if (threads <= 0 || threads > DMA_MAP_MAX_THREADS) {
fprintf(stderr, "invalid number of threads, must be in 1-%d\n",
DMA_MAP_MAX_THREADS);
exit(1);
}
if (seconds <= 0 || seconds > DMA_MAP_MAX_SECONDS) {
fprintf(stderr, "invalid number of seconds, must be in 1-%d\n",
DMA_MAP_MAX_SECONDS);
exit(1);
}
/* suppose the mininum DMA zone is 1MB in the world */
if (bits < 20 || bits > 64) {
fprintf(stderr, "invalid dma mask bit, must be in 20-64\n");
exit(1);
}
if (dir != DMA_MAP_BIDIRECTIONAL && dir != DMA_MAP_TO_DEVICE &&
dir != DMA_MAP_FROM_DEVICE) {
fprintf(stderr, "invalid dma direction\n");
exit(1);
}
fd = open("/sys/kernel/debug/dma_map_benchmark", O_RDWR);
if (fd == -1) {
perror("open");
exit(1);
}
map.seconds = seconds;
map.threads = threads;
map.node = node;
map.dma_bits = bits;
map.dma_dir = dir;
if (ioctl(fd, cmd, &map)) {
perror("ioctl");
exit(1);
}
printf("dma mapping benchmark: threads:%d seconds:%d node:%d dir:%s\n",
threads, seconds, node, dir[directions]);
printf("average map latency(us):%.1f standard deviation:%.1f\n",
map.avg_map_100ns/10.0, map.map_stddev/10.0);
printf("average unmap latency(us):%.1f standard deviation:%.1f\n",
map.avg_unmap_100ns/10.0, map.unmap_stddev/10.0);
return 0;
}
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