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-rw-r--r--Documentation/dmatest.txt27
1 files changed, 17 insertions, 10 deletions
diff --git a/Documentation/dmatest.txt b/Documentation/dmatest.txt
index 0beb4b68d81f..dd77a81bdb80 100644
--- a/Documentation/dmatest.txt
+++ b/Documentation/dmatest.txt
@@ -39,17 +39,24 @@ stops.
Note that running a new test will not stop any in progress test.
-The following command should return actual state of the test.
- % cat /sys/kernel/debug/dmatest/run
+The following command returns the state of the test.
+ % cat /sys/module/dmatest/parameters/run
-To wait for test done the user may perform a busy loop that checks the state.
+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
+initialization to pause until a test run has completed, while reading
+/sys/module/dmatest/parameters/wait waits for any running test to complete
+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.
- % while [ $(cat /sys/module/dmatest/parameters/run) = "Y" ]
- > do
- > echo -n "."
- > sleep 1
- > done
- > echo
+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
Part 3 - When built-in in the kernel...
@@ -79,7 +86,7 @@ number of tests executed, number that failed, and a result code.
Example:
% dmesg | tail -n 1
- dmatest: dma3chan0-copy0: summary 400000 tests, 0 failures iops: 61524 KB/s 246098 (0)
+ 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.

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