driver-api/dmaengine/dmatest.rst

11   capability of the following: DMA_MEMCPY (memory-to-memory), DMA_MEMSET
12   (const-to-memory or memory-to-memory, when emulated), DMA_XOR, DMA_PQ.
18 Part 1 - How to build the test module
23 	Device Drivers -> DMA Engine support -> DMA Test client
28 Part 2 - When dmatest is built as a module
47 Example of multi-channel test usage (new in the 5.0 kernel)::
58   For all tests, starting in the 5.0 kernel, either single- or multi-channel,
63   (shared) parameters used for all threads will use the new values.
64   After the channels are specified, each thread is set as pending. All threads
70     % ls -1 /sys/class/dma/
72 Once started a message like " dmatest: Added 1 threads using dma0chan0" is
93     % modprobe -r dmatest
99     % modprobe -r dmatest
101 Part 3 - When built-in in the kernel
106 re-run with the same or different parameters. For the details see the above
107 section `Part 2 - When dmatest is built as a module`_.
110 case. You always could check them at run-time by running ::
112     % grep -H . /sys/module/dmatest/parameters/*
114 Part 4 - Gathering the test results
123     % dmesg | tail -n 1
124     dmatest: result dma0chan0-copy0: #1: No errors with src_off=0x7bf dst_off=0x8ad len=0x3fea (0)
134     % dmesg | tail -n 1
135     dmatest: dma0chan0-copy0: summary 1 test, 0 failures 1000 iops 100000 KB/s (0)
140 Part 5 - Handling channel allocation
144 -------------------
161     dmatest: Added 1 threads using dma0chan2
169     dmatest: Added 1 threads using dma0chan1
171     dmatest: Added 1 threads using dma0chan2
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
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
207 -------------------
214     dmatest: Added 1 threads using dma0chan1