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Commit 3e5ccd86 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Vinod Koul
Browse files

dmatest: return actual state in 'run' file 



The following command should return actual state of the test.
	% cat /sys/kernel/debug/dmatest/run

To wait for test done the user may perform a busy loop that checks the state.
	% while [ $(cat /sys/kernel/debug/dmatest/run) = "Y" ]
	> do
	> 	echo -n "."
	> 	sleep 1
	> done
	> echo

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 851b7e16

Documentation/dmatest.txt

+12 −0
Original line number Diff line number Diff line
@@ -36,6 +36,18 @@ in the original code. 


Note that running a new test will stop any in progress test.



The following command should return actual state of the test.

	% cat /sys/kernel/debug/dmatest/run



To wait for test done the user may perform a busy loop that checks the state.



	% while [ $(cat /sys/kernel/debug/dmatest/run) = "Y" ]

	> do

	> 	echo -n "."

	> 	sleep 1

	> done

	> echo



	Part 3 - When built-in in the kernel...



The module parameters that is supplied to the kernel command line will be used

drivers/dma/dmatest.c

+21 −2
Original line number Diff line number Diff line
@@ -93,6 +93,7 @@ struct dmatest_thread { 
	u8			**srcs;

	u8			**dsts;

	enum dma_transaction_type type;

	bool			done;

};



struct dmatest_chan {
@@ -603,6 +604,8 @@ static int dmatest_func(void *data) 
	if (ret)

		dmaengine_terminate_all(chan);



	thread->done = true;



	if (params->iterations > 0)

		while (!kthread_should_stop()) {

			DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wait_dmatest_exit);
@@ -884,12 +887,28 @@ static ssize_t dtf_read_run(struct file *file, char __user *user_buf, 
{

	struct dmatest_info *info = file->private_data;

	char buf[3];

	struct dmatest_chan *dtc;

	bool alive = false;



	mutex_lock(&info->lock);

	if (info->nr_channels)

	list_for_each_entry(dtc, &info->channels, node) {

		struct dmatest_thread *thread;



		list_for_each_entry(thread, &dtc->threads, node) {

			if (!thread->done) {

				alive = true;

				break;

			}

		}

	}



	if (alive) {

		buf[0] = 'Y';

	else

	} else {

		__stop_threaded_test(info);

		buf[0] = 'N';

	}



	mutex_unlock(&info->lock);

	buf[1] = '\n';

	buf[2] = 0x00;