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| author | Nicolas Ferre <nicolas.ferre@atmel.com> | 2009-07-03 21:26:51 +0400 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-07-23 09:05:26 +0400 |
| commit | 0a2ff57d6fba92842272889b4bca447344cd9d36 (patch) | |
| tree | 91dbcb3d8a668f1aac6c2859921294e74df70b66 /drivers/dma/dmatest.c | |
| parent | c019894efc9c9ba5939948caa78c133b1ec8ae63 (diff) | |
| download | linux-0a2ff57d6fba92842272889b4bca447344cd9d36.tar.xz | |
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>
Diffstat (limited to 'drivers/dma/dmatest.c')
| -rw-r--r-- | 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 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; } |