4.3.4. 测试指南
4.3.4.1. 测试环境
4.3.4.1.1. 硬件
开发板
4.3.4.1.2. 软件
PC端的串口终端软件，用于PC和开发板进行串口通信
Linux内核原生的dmatest模块
4.3.4.1.3. 软件配置
4.3.4.1.3.1. dmttest
dmatest是 Linux 内核中原生的一个模块，参考快速入门 - 编译概述 - Kernel配置，按如下选择：
Linux
Device Drivers
[*] DMA Engine support
<*> DMA Test client
备注
dmatest模块只限于测试 Mem To Mem 的数据传输操作。
4.3.4.2. dmatest 测试
dmatest模块初始化成功后，会在Sysfs目录创建一些节点，测试过程就是通过这些节点配置参数、启动测试。
[aic@] # cd /sys/module/dmatest/parameters/
[aic@parameters] # ls
alignment max_channels run transfer_size
channel norandom test_buf_size verbose
device noverify test_list wait
dmatest polled threads_per_chan xor_sources
iterations pq_sources timeout
[aic@parameters] # echo 30 > iterations
[aic@parameters] # echo 8 > max_channels
[aic@parameters] # echo Y > polled
[aic@parameters] # echo Y > run
[ 104.696480] dmatest: No channels configured, continue with any
[ 104.697377] dmatest: Added 1 threads using dma0chan2
[ 104.698061] dmatest: Added 1 threads using dma0chan3
[ 104.698695] dmatest: Added 1 threads using dma0chan4
[ 104.699334] dmatest: Added 1 threads using dma0chan5
[ 104.699964] dmatest: Added 1 threads using dma0chan6
[ 104.700599] dmatest: Added 1 threads using dma0chan7
[ 104.701248] dmatest: Added 1 threads using dma0chan8
[ 104.701883] dmatest: Added 1 threads using dma0chan9
[ 104.702328] dmatest: Started 1 threads using dma0chan2
[ 104.702776] dmatest: Started 1 threads using dma0chan3
[ 104.703223] dmatest: Started 1 threads using dma0chan4
[ 104.703671] dmatest: Started 1 threads using dma0chan5
[ 104.704118] dmatest: Started 1 threads using dma0chan6
[ 104.704564] dmatest: Started 1 threads using dma0chan7
[ 104.705011] dmatest: Started 1 threads using dma0chan8
[ 104.705457] dmatest: Started 1 threads using dma0chan9
[ 105.006038] dmatest: dma0chan4-copy0: summary 30 tests, 0 failures 106.28 iops 836 KB/s (0)
[ 105.306046] dmatest: dma0chan2-copy0: summary 30 tests, 0 failures 106.58 iops 884 KB/s (0)
[ 105.606055] dmatest: dma0chan3-copy0: summary 30 tests, 0 failures 106.60 iops 1044 KB/s (0)
[ 105.906057] dmatest: dma0chan5-copy0: summary 30 tests, 0 failures 106.59 iops 835 KB/s (0)
[ 106.206050] dmatest: dma0chan6-copy0: summary 30 tests, 0 failures 106.59 iops 792 KB/s (0)
[ 106.506034] dmatest: dma0chan7-copy0: summary 30 tests, 0 failures 106.61 iops 856 KB/s (0)
[ 106.806048] dmatest: dma0chan8-copy0: summary 30 tests, 0 failures 107.64 iops 843 KB/s (0)
[ 107.106044] dmatest: dma0chan9-copy0: summary 30 tests, 0 failures 106.81 iops 993 KB/s (0)