From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757062AbZFBOid (ORCPT ); Tue, 2 Jun 2009 10:38:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755174AbZFBOhU (ORCPT ); Tue, 2 Jun 2009 10:37:20 -0400 Received: from va3ehsobe005.messaging.microsoft.com ([216.32.180.15]:56377 "EHLO VA3EHSOBE005.bigfish.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755144AbZFBOhS (ORCPT ); Tue, 2 Jun 2009 10:37:18 -0400 X-SpamScore: 3 X-BigFish: VPS3(zzzz1202hzzz32i17ch43j66h) X-Spam-TCS-SCL: 5:0 X-FB-SS: 5, X-WSS-ID: 0KKM8LA-04-0I0-01 From: Joerg Roedel To: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org CC: akpm@linux-foundation.org, Joerg Roedel Subject: [PATCH 3/4] dma-debug: add dma_debug_driver kernel command line Date: Tue, 2 Jun 2009 16:36:43 +0200 Message-ID: <1243953404-31799-4-git-send-email-joerg.roedel@amd.com> X-Mailer: git-send-email 1.6.3.1 In-Reply-To: <1243953404-31799-1-git-send-email-joerg.roedel@amd.com> References: <1243953404-31799-1-git-send-email-joerg.roedel@amd.com> X-OriginalArrivalTime: 02 Jun 2009 14:36:48.0016 (UTC) FILETIME=[8F437100:01C9E38F] MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch add the dma_debug_driver= boot parameter to enable the driver filter for early boot. Signed-off-by: Joerg Roedel --- Documentation/kernel-parameters.txt | 7 +++++++ lib/dma-debug.c | 18 ++++++++++++++++++ 2 files changed, 25 insertions(+), 0 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index e87bdbf..b3f1314 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -646,6 +646,13 @@ and is between 256 and 4096 characters. It is defined in the file DMA-API debugging code disables itself because the architectural default is too low. + dma_debug_driver= + With this option the DMA-API debugging driver + filter feature can be enabled at boot time. Just + pass the driver to filter for as the parameter. + The filter can be disabled or changed to another + driver later using sysfs. + dscc4.setup= [NET] dtc3181e= [HW,SCSI] diff --git a/lib/dma-debug.c b/lib/dma-debug.c index c6330b1..d0618aa 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -1109,3 +1109,21 @@ void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, } EXPORT_SYMBOL(debug_dma_sync_sg_for_device); +static int __init dma_debug_driver_setup(char *str) +{ + int i; + + for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) { + current_driver_name[i] = *str; + if (*str == 0) + break; + } + + if (current_driver_name[0]) + printk(KERN_INFO "DMA-API: enable driver filter for " + "driver [%s]\n", current_driver_name); + + + return 1; +} +__setup("dma_debug_driver=", dma_debug_driver_setup); -- 1.6.3.1