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tools/dma: Add dma_map_sg support

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Support for dma_map_sg, add option '-m' to distinguish mode.

i) Users can set option '-m' to select mode:
   DMA_MAP_BENCH_SINGLE_MODE=0, DMA_MAP_BENCH_SG_MODE:=1
   (The mode is also show in the test result).
ii) Users can set option '-g' to set sg_nents
    (total count of entries in scatterlist)
    the maximum number is 1024. Each of sg buf size is PAGE_SIZE.
    e.g
    [root@localhost]# ./dma_map_benchmark -m 1 -g 8 -t 8 -s 30 -d 2
    dma mapping mode: DMA_MAP_BENCH_SG_MODE
    dma mapping benchmark: threads:8 seconds:30 node:-1
    dir:FROM_DEVICE granule/sg_nents: 8
    average map latency(us):1.4 standard deviation:0.3
    average unmap latency(us):1.3 standard deviation:0.3
    [root@localhost]# ./dma_map_benchmark -m 0 -g 8 -t 8 -s 30 -d 2
    dma mapping mode: DMA_MAP_BENCH_SINGLE_MODE
    dma mapping benchmark: threads:8 seconds:30 node:-1
    dir:FROM_DEVICE granule/sg_nents: 8
    average map latency(us):1.0 standard deviation:0.3
    average unmap latency(us):1.3 standard deviation:0.5

Reviewed-by: Barry Song <baohua@kernel.org>
Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20260225093800.3625054-4-xiaqinxin@huawei.com
This commit is contained in:
Qinxin Xia
2026-02-25 17:38:00 +08:00
committed by Marek Szyprowski
parent a8d14dd6e6
commit a54302ccfd
1 changed files with 20 additions and 3 deletions
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23
tools/dma/dma_map_benchmark.c
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@@ -20,12 +20,19 @@ static char *directions[] = {
"FROM_DEVICE",
};
static char *mode[] = {
"SINGLE_MODE",
"SG_MODE",
};
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 single map mode */
int map_mode = DMA_MAP_BENCH_SINGLE_MODE;
/* default dma mask 32bit, bidirectional DMA */
int bits = 32, xdelay = 0, dir = DMA_MAP_BIDIRECTIONAL;
/* default granule 1 PAGESIZE */
@@ -33,7 +40,7 @@ int main(int argc, char **argv)
int cmd = DMA_MAP_BENCHMARK;
while ((opt = getopt(argc, argv, "t:s:n:b:d:x:g:")) != -1) {
while ((opt = getopt(argc, argv, "t:s:n:b:d:x:g:m:")) != -1) {
switch (opt) {
case 't':
threads = atoi(optarg);
@@ -56,11 +63,20 @@ int main(int argc, char **argv)
case 'g':
granule = atoi(optarg);
break;
case 'm':
map_mode = atoi(optarg);
break;
default:
return -1;
}
}
if (map_mode < 0 || map_mode >= DMA_MAP_BENCH_MODE_MAX) {
fprintf(stderr, "invalid map mode, SINGLE_MODE:%d, SG_MODE: %d\n",
DMA_MAP_BENCH_SINGLE_MODE, DMA_MAP_BENCH_SG_MODE);
exit(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);
@@ -110,14 +126,15 @@ int main(int argc, char **argv)
map.dma_dir = dir;
map.dma_trans_ns = xdelay;
map.granule = granule;
map.map_mode = map_mode;
if (ioctl(fd, cmd, &map)) {
perror("ioctl");
exit(1);
}
printf("dma mapping benchmark: threads:%d seconds:%d node:%d dir:%s granule: %d\n",
threads, seconds, node, directions[dir], granule);
printf("dma mapping benchmark(%s): threads:%d seconds:%d node:%d dir:%s granule:%d\n",
mode[map_mode], threads, seconds, node, directions[dir], granule);
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",