include/linux/map_benchmark.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2022 HiSilicon Limited.
   4  */
   5
   6 #ifndef _KERNEL_DMA_BENCHMARK_H
   7 #define _KERNEL_DMA_BENCHMARK_H
   8
   9 #define DMA_MAP_BENCHMARK       _IOWR('d', 1, struct map_benchmark)
  10 #define DMA_MAP_MAX_THREADS     1024
  11 #define DMA_MAP_MAX_SECONDS     300
  12 #define DMA_MAP_MAX_TRANS_DELAY (10 * NSEC_PER_MSEC)
  13
  14 #define DMA_MAP_BIDIRECTIONAL   0
  15 #define DMA_MAP_TO_DEVICE       1
  16 #define DMA_MAP_FROM_DEVICE     2
  17
  18 struct map_benchmark {
  19         __u64 avg_map_100ns; /* average map latency in 100ns */
  20         __u64 map_stddev; /* standard deviation of map latency */
  21         __u64 avg_unmap_100ns; /* as above */
  22         __u64 unmap_stddev;
  23         __u32 threads; /* how many threads will do map/unmap in parallel */
  24         __u32 seconds; /* how long the test will last */
  25         __s32 node; /* which numa node this benchmark will run on */
  26         __u32 dma_bits; /* DMA addressing capability */
  27         __u32 dma_dir; /* DMA data direction */
  28         __u32 dma_trans_ns; /* time for DMA transmission in ns */
  29         __u32 granule;  /* how many PAGE_SIZE will do map/unmap once a time */
  30 };
  31 #endif /* _KERNEL_DMA_BENCHMARK_H */