This converts and moves dmatest file with some format
changes for RST style
Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
---
.../dmaengine/dmatest.rst} | 96 +++++++++++++---------
Documentation/driver-api/dmaengine/index.rst | 10 +++
2 files changed, 67 insertions(+), 39 deletions(-)
rename Documentation/{dmaengine/dmatest.txt => driver-api/dmaengine/dmatest.rst} (50%)
diff --git a/Documentation/dmaengine/dmatest.txt b/Documentation/driver-api/dmaengine/dmatest.rst
similarity index 50%
rename from Documentation/dmaengine/dmatest.txt
rename to Documentation/driver-api/dmaengine/dmatest.rst
index fb683c72dea8..3922c0a3f0c0 100644
--- a/Documentation/dmaengine/dmatest.txt
+++ b/Documentation/driver-api/dmaengine/dmatest.rst
@@ -1,11 +1,13 @@
- DMA Test Guide
- ==============
+==============
+DMA Test Guide
+==============
- Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
+Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
This small document introduces how to test DMA drivers using dmatest module.
- Part 1 - How to build the test module
+Part 1 - How to build the test module
+=====================================
The menuconfig contains an option that could be found by following path:
Device Drivers -> DMA Engine support -> DMA Test client
@@ -13,25 +15,31 @@ The menuconfig contains an option that could be found by following path:
In the configuration file the option called CONFIG_DMATEST. The dmatest could
be built as module or inside kernel. Let's consider those cases.
- Part 2 - When dmatest is built as a module...
+Part 2 - When dmatest is built as a module
+==========================================
-Example of usage:
- % modprobe dmatest channel=dma0chan0 timeout=2000 iterations=1 run=1
+Example of usage: ::
-...or:
- % modprobe dmatest
- % echo dma0chan0 > /sys/module/dmatest/parameters/channel
- % echo 2000 > /sys/module/dmatest/parameters/timeout
- % echo 1 > /sys/module/dmatest/parameters/iterations
- % echo 1 > /sys/module/dmatest/parameters/run
+ % modprobe dmatest channel=dma0chan0 timeout=2000 iterations=1 run=1
-...or on the kernel command line:
+...or: ::
- dmatest.channel=dma0chan0 dmatest.timeout=2000 dmatest.iterations=1 dmatest.run=1
+ % modprobe dmatest
+ % echo dma0chan0 > /sys/module/dmatest/parameters/channel
+ % echo 2000 > /sys/module/dmatest/parameters/timeout
+ % echo 1 > /sys/module/dmatest/parameters/iterations
+ % echo 1 > /sys/module/dmatest/parameters/run
-Hint: available channel list could be extracted by running the following
-command:
- % ls -1 /sys/class/dma/
+...or on the kernel command line: ::
+
+ dmatest.channel=dma0chan0 dmatest.timeout=2000 dmatest.iterations=1 dmatest.run=1
+
+..hint:: available channel list could be extracted by running the following
+ command:
+
+::
+
+ % ls -1 /sys/class/dma/
Once started a message like "dmatest: Started 1 threads using dma0chan0" is
emitted. After that only test failure messages are reported until the test
@@ -39,8 +47,9 @@ stops.
Note that running a new test will not stop any in progress test.
-The following command returns the state of the test.
- % cat /sys/module/dmatest/parameters/run
+The following command returns the state of the test. ::
+
+ % cat /sys/module/dmatest/parameters/run
To wait for test completion userpace can poll 'run' until it is false, or use
the wait parameter. Specifying 'wait=1' when loading the module causes module
@@ -50,15 +59,19 @@ before returning. For example, the following scripts wait for 42 tests
to complete before exiting. Note that if 'iterations' is set to 'infinite' then
waiting is disabled.
-Example:
- % modprobe dmatest run=1 iterations=42 wait=1
- % modprobe -r dmatest
-...or:
- % modprobe dmatest run=1 iterations=42
- % cat /sys/module/dmatest/parameters/wait
- % modprobe -r dmatest
+Example: ::
+
+ % modprobe dmatest run=1 iterations=42 wait=1
+ % modprobe -r dmatest
- Part 3 - When built-in in the kernel...
+...or: ::
+
+ % modprobe dmatest run=1 iterations=42
+ % cat /sys/module/dmatest/parameters/wait
+ % modprobe -r dmatest
+
+Part 3 - When built-in in the kernel
+====================================
The module parameters that is supplied to the kernel command line will be used
for the first performed test. After user gets a control, the test could be
@@ -66,27 +79,32 @@ re-run with the same or different parameters. For the details see the above
section "Part 2 - When dmatest is built as a module..."
In both cases the module parameters are used as the actual values for the test
-case. You always could check them at run-time by running
- % grep -H . /sys/module/dmatest/parameters/*
+case. You always could check them at run-time by running ::
+
+ % grep -H . /sys/module/dmatest/parameters/*
- Part 4 - Gathering the test results
+Part 4 - Gathering the test results
+===================================
-Test results are printed to the kernel log buffer with the format:
+Test results are printed to the kernel log buffer with the format: ::
-"dmatest: result <channel>: <test id>: '<error msg>' with src_off=<val> dst_off=<val> len=<val> (<err code>)"
+ "dmatest: result <channel>: <test id>: '<error msg>' with src_off=<val> dst_off=<val> len=<val> (<err code>)"
-Example of output:
- % dmesg | tail -n 1
- dmatest: result dma0chan0-copy0: #1: No errors with src_off=0x7bf dst_off=0x8ad len=0x3fea (0)
+Example of output: ::
+
+
+ % dmesg | tail -n 1
+ dmatest: result dma0chan0-copy0: #1: No errors with src_off=0x7bf dst_off=0x8ad len=0x3fea (0)
The message format is unified across the different types of errors. A number in
the parens represents additional information, e.g. error code, error counter,
or status. A test thread also emits a summary line at completion listing the
number of tests executed, number that failed, and a result code.
-Example:
- % dmesg | tail -n 1
- dmatest: dma0chan0-copy0: summary 1 test, 0 failures 1000 iops 100000 KB/s (0)
+Example: ::
+
+ % dmesg | tail -n 1
+ dmatest: dma0chan0-copy0: summary 1 test, 0 failures 1000 iops 100000 KB/s (0)
The details of a data miscompare error are also emitted, but do not follow the
above format.
diff --git a/Documentation/driver-api/dmaengine/index.rst b/Documentation/driver-api/dmaengine/index.rst
index ffc2b797938c..fae852922a49 100644
--- a/Documentation/driver-api/dmaengine/index.rst
+++ b/Documentation/driver-api/dmaengine/index.rst
@@ -27,6 +27,16 @@ API of the DMAEngine. This is applicable only for slave DMA usage only.
client
+DMA Test documentation
+----------------------
+
+This book introduces how to test DMA drivers using dmatest module.
+
+.. toctree::
+ :maxdepth: 1
+
+ dmatest
+
.. only:: subproject
Indices
--
2.7.4
--
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