diff options
Diffstat (limited to 'Documentation/dmatest.txt')
| -rw-r--r-- | Documentation/dmatest.txt | 27 |
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. |