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Support for dma scatter-gather mapping and is intended for testing mapping performance. It achieves by introducing the dma_sg_map_param structure and related functions, which enable the implementation of scatter-gather mapping preparation, mapping, and unmapping operations. Additionally, the dma_map_benchmark_ops array is updated to include operations for scatter-gather mapping. This commit aims to provide a wider range of mapping performance test to cater to different scenarios. 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/20260225093800.3625054-3-xiaqinxin@huawei.com
45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
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/*
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* Copyright (C) 2022-2025 HiSilicon Limited.
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*/
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#ifndef _UAPI_DMA_BENCHMARK_H
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#define _UAPI_DMA_BENCHMARK_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_MAX_TRANS_DELAY (10 * NSEC_PER_MSEC)
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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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enum {
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DMA_MAP_BENCH_SINGLE_MODE,
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DMA_MAP_BENCH_SG_MODE,
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DMA_MAP_BENCH_MODE_MAX
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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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__u32 dma_trans_ns; /* time for DMA transmission in ns */
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__u32 granule; /* - SINGLE_MODE: number of pages mapped/unmapped per operation
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* - SG_MODE: number of scatterlist entries (each maps one page)
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*/
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__u8 map_mode; /* the mode of dma map */
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__u8 expansion[75]; /* For future use */
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};
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#endif /* _UAPI_DMA_BENCHMARK_H */
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