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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>
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1 changed files with 14 additions and 1 deletions
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@ -38,6 +38,11 @@ module_param(max_channels, uint, S_IRUGO);
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MODULE_PARM_DESC(max_channels,
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"Maximum number of channels to use (default: all)");
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static unsigned int iterations;
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module_param(iterations, uint, S_IRUGO);
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MODULE_PARM_DESC(iterations,
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"Iterations before stopping test (default: infinite)");
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static unsigned int xor_sources = 3;
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module_param(xor_sources, uint, S_IRUGO);
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MODULE_PARM_DESC(xor_sources,
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@ -270,7 +275,8 @@ static int dmatest_func(void *data)
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flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP | DMA_PREP_INTERRUPT;
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while (!kthread_should_stop()) {
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while (!kthread_should_stop()
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&& !(iterations && total_tests >= iterations)) {
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struct dma_device *dev = chan->device;
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struct dma_async_tx_descriptor *tx = NULL;
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dma_addr_t dma_srcs[src_cnt];
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@ -416,6 +422,13 @@ static int dmatest_func(void *data)
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err_srcs:
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pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
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thread_name, total_tests, failed_tests, ret);
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if (iterations > 0)
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while (!kthread_should_stop()) {
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DECLARE_WAIT_QUEUE_HEAD(wait_dmatest_exit);
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interruptible_sleep_on(&wait_dmatest_exit);
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}
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return ret;
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}
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