linux-kernel - Re: [PATCH 06/10] dmatest: run test via debugfs

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Date:	Tue, 5 Mar 2013 16:05:25 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.jf.intel.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.jf.intel.com>,
	linux-kernel@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 06/10] dmatest: run test via debugfs

On Tue, Mar 05, 2013 at 12:36:44PM +0200, Andy Shevchenko wrote:
> On Tue, 2013-03-05 at 14:56 +0530, Vinod Koul wrote: 
> > On Mon, Mar 04, 2013 at 11:09:30AM +0200, Andy Shevchenko wrote:
> > > @@ -0,0 +1,48 @@
> > > +				DMA Test Guide
> > > +				==============
> > > +
> > > +		Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > > +
> > > +This small document introduces how to test DMA drivers using dmatest 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
> > > +
> > > +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...
> > > +
> > > +After mounting debugfs and loading the module, the /sys/kernel/debug/dmatest
> > > +folder with nodes will be created. They are the same as module parameters with
> > > +addition of the 'run' node that controls run and stop phases of the test.
> > > +
> > > +Note that in this case test will not run on load automatically.
> > > +
> > > +Example of usage:
> > > +	% echo dma0chan0 > /sys/kernel/debug/dmatest/channel
> > > +	% echo 2000 > /sys/kernel/debug/dmatest/timeout
> > > +	% echo 1 > /sys/kernel/debug/dmatest/iterations
> > > +	% echo 1 > /sys/kernel/debug/dmatest/run
> > How do you terminate a test? Esp if you have started bunch of concurent tests
> > and want to terminate one of them...
> 
> There is only one test in progress is possible.
Wasnt the idea to run concurrent tests, or I read wrongly...

--
~Vinod
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