Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[sfrench/cifs-2.6.git] / Documentation / driver-api / dmaengine / dmatest.rst

diff --git a/Documentation/driver-api/dmaengine/dmatest.rst b/Documentation/driver-api/dmaengine/dmatest.rst
index 3922c0a3f0c09c7d4d0e8e775796bf4d05a25dfe..7ce5e71c353e89afa798b4833c4e8a0d833a0b81 100644 (file)
--- a/Documentation/driver-api/dmaengine/dmatest.rst
+++ b/Documentation/driver-api/dmaengine/dmatest.rst
@@ -6,10 +6,16 @@ Andy Shevchenko <andriy.shevchenko@linux.intel.com>
 
 This small document introduces how to test DMA drivers using dmatest module.
 
+.. note::
+  The test suite works only on the channels that have at least one
+  capability of the following: DMA_MEMCPY (memory-to-memory), DMA_MEMSET
+  (const-to-memory or memory-to-memory, when emulated), DMA_XOR, DMA_PQ.
+
 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
 
 In the configuration file the option called CONFIG_DMATEST. The dmatest could
@@ -18,11 +24,11 @@ be built as module or inside kernel. Let's consider those cases.
 Part 2 - When dmatest is built as a module
 ==========================================
 
-Example of usage: ::
+Example of usage::
 
     % modprobe dmatest channel=dma0chan0 timeout=2000 iterations=1 run=1
 
-...or: ::
+...or::
 
     % modprobe dmatest
     % echo dma0chan0 > /sys/module/dmatest/parameters/channel
@@ -30,14 +36,12 @@ Example of usage: ::
     % echo 1 > /sys/module/dmatest/parameters/iterations
     % echo 1 > /sys/module/dmatest/parameters/run
 
-...or on the kernel command line: ::
+...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:
-
-::
+.. hint::
+  available channel list could be extracted by running the following command::
 
     % ls -1 /sys/class/dma/
 
@@ -59,12 +63,12 @@ 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: ::
+Example::
 
     % modprobe dmatest run=1 iterations=42 wait=1
     % modprobe -r dmatest
 
-...or: ::
+...or::
 
     % modprobe dmatest run=1 iterations=42
     % cat /sys/module/dmatest/parameters/wait
@@ -76,7 +80,7 @@ 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
 re-run with the same or different parameters. For the details see the above
-section "Part 2 - When dmatest is built as a module..."
+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 ::
@@ -86,22 +90,22 @@ case. You always could check them at run-time by running ::
 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>)"
 
-Example of output: ::
-
+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.
+The message format is unified across the different types of errors. A
+number in the parentheses 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: ::
+Example::
 
     % dmesg | tail -n 1
     dmatest: dma0chan0-copy0: summary 1 test, 0 failures 1000 iops 100000 KB/s (0)