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| author | Dan Williams <dan.j.williams@intel.com> | 2013-11-07 04:30:01 +0400 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2013-11-14 23:04:39 +0400 |
| commit | a310d037b8d06755c62bb4878c00d19490af5550 (patch) | |
| tree | 7546e7c90f51bb2491558ce4772740ad9e903540 /Documentation/dmatest.txt | |
| parent | 0adff800662f52d0ffc3e420db231769cb3fff13 (diff) | |
| download | linux-a310d037b8d06755c62bb4878c00d19490af5550.tar.xz | |
dmatest: restore ability to start test at module load and init
1/ move 'run' control to a module parameter so we can do:
modprobe dmatest run=1. With this moved the rest of the debugfs
boilerplate can go.
2/ Fix parameter initialization. Previously the test was being started
without taking the parameters into account in the built-in case.
Also killed off the '__' version of some routines. The new rule is just
hold the lock when calling a *threaded_test() routine.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'Documentation/dmatest.txt')
| -rw-r--r-- | Documentation/dmatest.txt | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/Documentation/dmatest.txt b/Documentation/dmatest.txt index 45b8c95f1a21..e6e16a7f3706 100644 --- a/Documentation/dmatest.txt +++ b/Documentation/dmatest.txt @@ -15,17 +15,19 @@ be built as module or inside kernel. Let's consider those cases. Part 2 - When dmatest is built as a module... -After mounting debugfs and loading the module, the /sys/kernel/debug/dmatest -folder with a file named 'run' nodes will be created. 'run' controls run and -stop phases of the test. - -Note that in this case test will not run on load automatically. - Example of usage: + % modprobe dmatest channel=dma0chan0 timeout=2000 iterations=1 run=1 + +...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/kernel/debug/dmatest/run + % echo 1 > /sys/module/dmatest/parameters/run + +...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: @@ -42,7 +44,7 @@ The following command should return actual state of the test. To wait for test done the user may perform a busy loop that checks the state. - % while [ $(cat /sys/kernel/debug/dmatest/run) = "Y" ] + % while [ $(cat /sys/module/dmatest/parameters/run) = "Y" ] > do > echo -n "." > sleep 1 |