en Copyright 2025 Java http://opengrok.net:8080/history/linux/tools/dma/config#f74ee32963f1b74865fe679e2475450434fea51c tools/dma: move dma_map_benchmark from selftests to tools/dmadma_map_benchmark is a standalone developer tool rather than anautomated selftest. It has no pass/fail criteria, expects manualinvocation, and is built as a normal userspace binary. Move it totools/dma/ and add a minimal Makefile.Suggested-by: Marek Szyprowski <m.szyprowski@samsung.com>Suggested-by: Barry Song <baohua@kernel.org>Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com>Acked-by: Barry Song <baohua@kernel.org>Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>Link: https://lore.kernel.org/r/20251028120900.2265511-3-xiaqinxin@huawei.com List of files: /linux/tools/dma/config Tue, 28 Oct 2025 12:09:00 +0000 Qinxin Xia <xiaqinxin@huawei.com> http://opengrok.net:8080/history/linux/tools/dma/config#7679325702c90aecd393cd7cde685576c14489c0 selftests/dma: add test application for DMA_MAP_BENCHMARKThis 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 andbind to dma_map_benchmark:echo dma_map_benchmark > /sys/bus/platform/devices/xxx/driver_overrideecho xxx > /sys/bus/platform/drivers/xxx/unbindecho xxx > /sys/bus/platform/drivers/dma_map_benchmark/bindAnother example for PCI devices:echo dma_map_benchmark > /sys/bus/pci/devices/0000:00:01.0/driver_overrideecho 0000:00:01.0 > /sys/bus/pci/drivers/xxx/unbindecho 0000:00:01.0 > /sys/bus/pci/drivers/dma_map_benchmark/bindThe below command will run 16 threads on numa node 0 for 10 seconds onthe device bound to dma_map_benchmark platform_driver or pci_driver:./dma_map_benchmark -t 16 -s 10 -n 0dma mapping benchmark: threads:16 seconds:10average map latency(us):1.1 standard deviation:1.9average unmap latency(us):0.5 standard deviation:0.8Cc: 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> List of files: /linux/tools/dma/config Mon, 16 Nov 2020 06:08:48 +0000 Barry Song <song.bao.hua@hisilicon.com>