dmaengine: doc: ReSTize dmatest doc

This converts and moves dmatest file with some format
changes for RST style
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/dmaengine/dmatest.txt → Documentation/driver-api/dmaengine/dmatest.rst

-				DMA Test Guide
-				==============
+==============
+DMA Test Guide
+==============
 
-		Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+Andy Shevchenko <andriy.shevchenko@linux.intel.com>
 
 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.

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