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selftests/dma: add test application for DMA_MAP_BENCHMARK
This patch provides the test application for DMA_MAP_BENCHMARK. Before running the test application, we need to bind a device to dma_map_ benchmark driver. For example, unbind "xxx" from its original driver and bind to dma_map_benchmark: echo dma_map_benchmark > /sys/bus/platform/devices/xxx/driver_override echo xxx > /sys/bus/platform/drivers/xxx/unbind echo xxx > /sys/bus/platform/drivers/dma_map_benchmark/bind Another example for PCI devices: echo dma_map_benchmark > /sys/bus/pci/devices/0000:00:01.0/driver_override echo 0000:00:01.0 > /sys/bus/pci/drivers/xxx/unbind echo 0000:00:01.0 > /sys/bus/pci/drivers/dma_map_benchmark/bind The below command will run 16 threads on numa node 0 for 10 seconds on the device bound to dma_map_benchmark platform_driver or pci_driver: ./dma_map_benchmark -t 16 -s 10 -n 0 dma mapping benchmark: threads:16 seconds:10 average map latency(us):1.1 standard deviation:1.9 average unmap latency(us):0.5 standard deviation:0.8 Cc: Will Deacon <will@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Barry Song <song.bao.hua@hisilicon.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
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@ -5237,6 +5237,12 @@ F: include/linux/dma-mapping.h
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F: include/linux/dma-map-ops.h
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F: kernel/dma/
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DMA MAPPING BENCHMARK
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M: Barry Song <song.bao.hua@hisilicon.com>
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L: iommu@lists.linux-foundation.org
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F: kernel/dma/map_benchmark.c
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F: tools/testing/selftests/dma/
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DMA-BUF HEAPS FRAMEWORK
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M: Sumit Semwal <sumit.semwal@linaro.org>
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R: Benjamin Gaignard <benjamin.gaignard@linaro.org>
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6
tools/testing/selftests/dma/Makefile
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6
tools/testing/selftests/dma/Makefile
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@ -0,0 +1,6 @@
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# SPDX-License-Identifier: GPL-2.0
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CFLAGS += -I../../../../usr/include/
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TEST_GEN_PROGS := dma_map_benchmark
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include ../lib.mk
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1
tools/testing/selftests/dma/config
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1
tools/testing/selftests/dma/config
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@ -0,0 +1 @@
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CONFIG_DMA_MAP_BENCHMARK=y
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123
tools/testing/selftests/dma/dma_map_benchmark.c
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123
tools/testing/selftests/dma/dma_map_benchmark.c
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@ -0,0 +1,123 @@
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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 <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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#define DMA_MAP_BENCHMARK _IOWR('d', 1, struct map_benchmark)
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#define DMA_MAP_MAX_THREADS 1024
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#define DMA_MAP_MAX_SECONDS 300
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#define DMA_MAP_BIDIRECTIONAL 0
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#define DMA_MAP_TO_DEVICE 1
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#define DMA_MAP_FROM_DEVICE 2
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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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struct map_benchmark {
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__u64 avg_map_100ns; /* average map latency in 100ns */
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__u64 map_stddev; /* standard deviation of map latency */
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__u64 avg_unmap_100ns; /* as above */
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__u64 unmap_stddev;
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__u32 threads; /* how many threads will do map/unmap in parallel */
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__u32 seconds; /* how long the test will last */
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__s32 node; /* which numa node this benchmark will run on */
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__u32 dma_bits; /* DMA addressing capability */
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__u32 dma_dir; /* DMA data direction */
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__u64 expansion[10]; /* For future use */
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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, dir = DMA_MAP_BIDIRECTIONAL;
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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:")) != -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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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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/* 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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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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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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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\n",
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threads, seconds, node, dir[directions]);
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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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