The patch titled
dmaengine: dmatest: add a maximum number of test iterations
has been added to the -mm tree. Its filename is
dmaengine-dmatest-add-a-maximum-number-of-test-iterations.patch
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Subject: dmaengine: dmatest: add a maximum number of test iterations
From: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
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@xxxxxxxxx>
Cc: Haavard Skinnemoen <haavard.skinnemoen@xxxxxxxxx>
Acked-by: Maciej Sosnowski <maciej.sosnowski@xxxxxxxxx>
Cc: "Williams, Dan J" <dan.j.williams@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/dma/dmatest.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff -puN drivers/dma/dmatest.c~dmaengine-dmatest-add-a-maximum-number-of-test-iterations drivers/dma/dmatest.c
--- a/drivers/dma/dmatest.c~dmaengine-dmatest-add-a-maximum-number-of-test-iterations
+++ a/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;
}
_
Patches currently in -mm which might be from nicolas.ferre@xxxxxxxxx are
linux-next.patch
dmaengine-dmatest-add-a-maximum-number-of-test-iterations.patch
dmaengine-dmatest-correct-thread_count-while-using-multiple-thread-per-channel.patch
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