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: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index cec1ec0b7d00..2d973d60e7b9 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 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 @@ err_srcbuf:
 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;
 }