driver-api/dmaengine/dmatest.rst

7 This small document introduces how to test DMA drivers using dmatest module.
25 In the configuration file the option called CONFIG_DMATEST. The dmatest could
28 Part 2 - When dmatest is built as a module
33     % modprobe dmatest timeout=2000 iterations=1 channel=dma0chan0 run=1
37     % modprobe dmatest
38     % echo 2000 > /sys/module/dmatest/parameters/timeout
39     % echo 1 > /sys/module/dmatest/parameters/iterations
40     % echo dma0chan0 > /sys/module/dmatest/parameters/channel
41     % echo 1 > /sys/module/dmatest/parameters/run
45     dmatest.timeout=2000 dmatest.iterations=1 dmatest.channel=dma0chan0 dmatest.run=1
49     % modprobe dmatest
50     % echo 2000 > /sys/module/dmatest/parameters/timeout
51     % echo 1 > /sys/module/dmatest/parameters/iterations
52     % echo dma0chan0 > /sys/module/dmatest/parameters/channel
53     % echo dma0chan1 > /sys/module/dmatest/parameters/channel
54     % echo dma0chan2 > /sys/module/dmatest/parameters/channel
55     % echo 1 > /sys/module/dmatest/parameters/run
72 Once started a message like " dmatest: Added 1 threads using dma0chan0" is
80     % cat /sys/module/dmatest/parameters/run
85 /sys/module/dmatest/parameters/wait waits for any running test to complete
92     % modprobe dmatest run=1 iterations=42 wait=1
93     % modprobe -r dmatest
97     % modprobe dmatest run=1 iterations=42
98     % cat /sys/module/dmatest/parameters/wait
99     % modprobe -r dmatest
107 section `Part 2 - When dmatest is built as a module`_.
112     % grep -H . /sys/module/dmatest/parameters/*
119 …"dmatest: result <channel>: <test id>: '<error msg>' with src_off=<val> dst_off=<val> len=<val> (<…
124     dmatest: result dma0chan0-copy0: #1: No errors with src_off=0x7bf dst_off=0x8ad len=0x3fea (0)
135     dmatest: dma0chan0-copy0: summary 1 test, 0 failures 1000 iops 100000 KB/s (0)
152     % echo 1 > /sys/module/dmatest/parameters/run
153     dmatest: No channels configured, continue with any
160     % echo dma0chan2 > /sys/module/dmatest/parameters/channel
161     dmatest: Added 1 threads using dma0chan2
168     % echo dma0chan1 > /sys/module/dmatest/parameters/channel
169     dmatest: Added 1 threads using dma0chan1
170     % echo dma0chan2 > /sys/module/dmatest/parameters/channel
171     dmatest: Added 1 threads using dma0chan2
172     % cat /sys/module/dmatest/parameters/channel
180     % echo "" > /sys/module/dmatest/parameters/channel
181     dmatest: Added 1 threads using dma0chan0
182     dmatest: Added 1 threads using dma0chan3
183     dmatest: Added 1 threads using dma0chan4
184     dmatest: Added 1 threads using dma0chan5
185     dmatest: Added 1 threads using dma0chan6
186     dmatest: Added 1 threads using dma0chan7
187     dmatest: Added 1 threads using dma0chan8
194     % cat /sys/module/dmatest/parameters/test_list
195     dmatest: 1 threads using dma0chan0
196     dmatest: 1 threads using dma0chan3
197     dmatest: 1 threads using dma0chan4
198     dmatest: 1 threads using dma0chan5
199     dmatest: 1 threads using dma0chan6
200     dmatest: 1 threads using dma0chan7
201     dmatest: 1 threads using dma0chan8
213     % echo dma0chan1 > /sys/module/dmatest/parameters/channel
214     dmatest: Added 1 threads using dma0chan1
217     % echo 0 > /sys/module/dmatest/parameters/run