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dmatest: return actual state in 'run' file

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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: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Andy Shevchenko 2013-03-04 11:09:31 +02:00 committed by Vinod Koul
parent 851b7e16a0
commit 3e5ccd866f
2 changed files with 33 additions and 2 deletions
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12
Documentation/dmatest.txt
View File

@ -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

23
drivers/dma/dmatest.c
View File

@ -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;