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authorNicolas Ferre <nicolas.ferre@atmel.com>2009-07-03 19:26:51 +0200
committerDan Williams <dan.j.williams@intel.com>2009-07-22 22:05:26 -0700
commit0a2ff57d6fba92842272889b4bca447344cd9d36 (patch)
tree91dbcb3d8a668f1aac6c2859921294e74df70b66
parentc019894efc9c9ba5939948caa78c133b1ec8ae63 (diff)
downloadop-kernel-dev-0a2ff57d6fba92842272889b4bca447344cd9d36.zip
op-kernel-dev-0a2ff57d6fba92842272889b4bca447344cd9d36.tar.gz
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>
-rw-r--r--drivers/dma/dmatest.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index cec1ec0..2d973d6 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;
}
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