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Subject[PATCH] dmaengine: dmatest: add a maximum number of test iterations
Date
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: Nicolas Ferre <nicolas.ferre@atmel.com>
---
drivers/dma/dmatest.c | 15 ++++++++++++++-
1 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index fb7da51..0131a1f 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -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 iteration_nbr = 0;
+module_param(iteration_nbr, uint, S_IRUGO);
+MODULE_PARM_DESC(iteration_nbr,
+ "Iteration number 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()
+ && !(iteration_nbr && total_tests >= iteration_nbr)) {
struct dma_device *dev = chan->device;
struct dma_async_tx_descriptor *tx = NULL;
dma_addr_t dma_srcs[src_cnt];
@@ -416,6 +422,13 @@ err_srcbuf:
err_srcs:
pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
thread_name, total_tests, failed_tests, ret);
+
+ if (iteration_nbr > 0)
+ while (!kthread_should_stop()) {
+ DECLARE_WAIT_QUEUE_HEAD(wait_dmatest_exit);
+ interruptible_sleep_on(&wait_dmatest_exit);
+ }
+
return ret;
}

--
1.5.3.7


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