From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758087AbZGCQZV (ORCPT ); Fri, 3 Jul 2009 12:25:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756988AbZGCQZH (ORCPT ); Fri, 3 Jul 2009 12:25:07 -0400 Received: from mail.atmel.fr ([81.80.104.162]:44158 "EHLO atmel-es2.atmel.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756279AbZGCQZG (ORCPT ); Fri, 3 Jul 2009 12:25:06 -0400 From: Nicolas Ferre To: dan.j.williams@intel.com, maciej.sosnowski@intel.com, avictor.za@gmail.com, linux-arm-kernel@lists.arm.linux.org.uk, haavard.skinnemoen@atmel.com Cc: patrice.vilchez@atmel.com, linux-kernel@vger.kernel.org, nicolas.ferre@atmel.com Subject: [PATCH] dmaengine: dmatest: add a maximum number of test iterations Date: Fri, 3 Jul 2009 19:26:51 +0200 Message-Id: <1246642011-21749-1-git-send-email-nicolas.ferre@atmel.com> X-Mailer: git-send-email 1.5.3.7 Message-Id: <448c4e65b62b87188ff0beb21133b60435b1f6bd.1246641180.git.nicolas.ferre@atmel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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 fb7da51..0131a1f 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 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; } -- 1.5.3.7