Lines Matching +full:multiple +full:- +full:channel

15 The dmatest module can be configured to test a specific channel. It can also
16 test multiple channels at the same time, and it can start multiple threads
17 competing for the same channel.
21   capability of the following: DMA_MEMCPY (memory-to-memory), DMA_MEMSET
22   (const-to-memory or memory-to-memory, when emulated), DMA_XOR, DMA_PQ.
28 Part 1 - How to build the test module
33 	Device Drivers -> DMA Engine support -> DMA Test client
38 Part 2 - When dmatest is built as a module
43     % modprobe dmatest timeout=2000 iterations=1 channel=dma0chan0 run=1
50     % echo dma0chan0 > /sys/module/dmatest/parameters/channel
55     dmatest.timeout=2000 dmatest.iterations=1 dmatest.channel=dma0chan0 dmatest.run=1
57 Example of multi-channel test usage (new in the 5.0 kernel)::
62     % echo dma0chan0 > /sys/module/dmatest/parameters/channel
63     % echo dma0chan1 > /sys/module/dmatest/parameters/channel
64     % echo dma0chan2 > /sys/module/dmatest/parameters/channel
68   For all tests, starting in the 5.0 kernel, either single- or multi-channel,
69   the channel parameter(s) must be set after all other parameters. It is at
72   to any of the other parameters, and an additional channel specified, the
80     % ls -1 /sys/class/dma/
83 emitted. A thread for that specific channel is created and is now pending, the
103     % modprobe -r dmatest
109     % modprobe -r dmatest
111 Part 3 - When built-in in the kernel
116 re-run with the same or different parameters. For the details see the above
117 section `Part 2 - When dmatest is built as a module`_.
120 case. You always could check them at run-time by running ::
122     % grep -H . /sys/module/dmatest/parameters/*
124 Part 4 - Gathering the test results
129 …"dmatest: result <channel>: <test id>: '<error msg>' with src_off=<val> dst_off=<val> len=<val> (<…
133     % dmesg | tail -n 1
134     dmatest: result dma0chan0-copy0: #1: No errors with src_off=0x7bf dst_off=0x8ad len=0x3fea (0)
144     % dmesg | tail -n 1
145     dmatest: dma0chan0-copy0: summary 1 test, 0 failures 1000 iops 100000 KB/s (0)
150 Part 5 - Handling channel allocation
154 -------------------
165 Channels are registered using the "channel" parameter. Channels can be requested by their
166 name, once requested, the channel is registered and a pending thread is added to the test list.
170     % echo dma0chan2 > /sys/module/dmatest/parameters/channel
174 Reading back the channel parameter will return the name of last channel that was added successfully.
178     % echo dma0chan1 > /sys/module/dmatest/parameters/channel
180     % echo dma0chan2 > /sys/module/dmatest/parameters/channel
182     % cat /sys/module/dmatest/parameters/channel
185 Another method of requesting channels is to request a channel with an empty string, Doing so
190     % echo "" > /sys/module/dmatest/parameters/channel
213 Note: Channels will have to be configured for each test run as channel configurations do not
217 -------------------
223     % echo dma0chan1 > /sys/module/dmatest/parameters/channel
232 channel is requested after completing a successful test run.