mirror of
https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9.git
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Jerry Snitselaar
eac7c19c08
JIRA: https://issues.redhat.com/browse/RHEL-147906 Upstream-Status: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git commit 23ee8a2563a0f24cf4964685ced23c32be444ab8 Author: Qinxin Xia <xiaqinxin@huawei.com> Date: Tue Oct 28 20:08:59 2025 +0800 The padding field in the structure was previously reserved to maintain a stable interface for potential new fields, ensuring compatibility with user-space shared data structures. However,it was accidentally removed by tiantao in a prior commit, which may lead to incompatibility between user space and the kernel. This patch reinstates the padding to restore the original structure layout and preserve compatibility. Fixes: 8ddde07a3d28 ("dma-mapping: benchmark: extract a common header file for map_benchmark definition") Cc: stable@vger.kernel.org Acked-by: Barry Song <baohua@kernel.org> Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com> Reported-by: Barry Song <baohua@kernel.org> Closes: https://lore.kernel.org/lkml/CAGsJ_4waiZ2+NBJG+SCnbNk+nQ_ZF13_Q5FHJqZyxyJTcEop2A@mail.gmail.com/ Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/r/20251028120900.2265511-2-xiaqinxin@huawei.com (cherry picked from commit 23ee8a2563a0f24cf4964685ced23c32be444ab8) Assisted-by: Claude:claude-opus-4-6 Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>
33 lines
1.1 KiB
C
33 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2022 HiSilicon Limited.
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*/
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#ifndef _KERNEL_DMA_BENCHMARK_H
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#define _KERNEL_DMA_BENCHMARK_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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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; /* how many PAGE_SIZE will do map/unmap once a time */
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__u8 expansion[76]; /* For future use */
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};
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#endif /* _KERNEL_DMA_BENCHMARK_H */
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