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Commit 0a2ff57d authored by Nicolas Ferre's avatar Nicolas Ferre Committed by Dan Williams
Browse files

dmaengine: dmatest: add a maximum number of test iterations 



The dmatest usually waits for the killing of its kthreads to stop
running tests.  This patch adds a parameter that sets a maximum
number of test iterations.

This feature is quite interesting for debugging when you set a lot of
traces in your dmaengine controller driver.

Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Acked-by: default avatarMaciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent c019894e

drivers/dma/dmatest.c

+14 −1
Original line number Diff line number Diff line
@@ -38,6 +38,11 @@ module_param(max_channels, uint, S_IRUGO); 
MODULE_PARM_DESC(max_channels,

		"Maximum number of channels to use (default: all)");



static unsigned int iterations;

module_param(iterations, uint, S_IRUGO);

MODULE_PARM_DESC(iterations,

		"Iterations before stopping test (default: infinite)");



static unsigned int xor_sources = 3;

module_param(xor_sources, uint, S_IRUGO);

MODULE_PARM_DESC(xor_sources,
@@ -270,7 +275,8 @@ static int dmatest_func(void *data) 


	flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP | DMA_PREP_INTERRUPT;



	while (!kthread_should_stop()) {

	while (!kthread_should_stop()

	       && !(iterations && total_tests >= iterations)) {

		struct dma_device *dev = chan->device;

		struct dma_async_tx_descriptor *tx = NULL;

		dma_addr_t dma_srcs[src_cnt];
@@ -416,6 +422,13 @@ static int dmatest_func(void *data) 
err_srcs:

	pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",

			thread_name, total_tests, failed_tests, ret);



	if (iterations > 0)

		while (!kthread_should_stop()) {

			DECLARE_WAIT_QUEUE_HEAD(wait_dmatest_exit);

			interruptible_sleep_on(&wait_dmatest_exit);

		}



	return ret;

}