From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755023Ab2ISB6p (ORCPT ); Tue, 18 Sep 2012 21:58:45 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:43906 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752667Ab2ISB6m (ORCPT ); Tue, 18 Sep 2012 21:58:42 -0400 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <5059256B.2010708@jp.fujitsu.com> Date: Wed, 19 Sep 2012 10:52:43 +0900 From: Takao Indoh User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:15.0) Gecko/20120907 Thunderbird/15.0.1 MIME-Version: 1.0 To: konrad@kernel.org CC: vgoyal@redhat.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, bhelgaas@google.com, hbabu@us.ibm.com, ishii.hironobu@jp.fujitsu.com, martin.wilck@ts.fujitsu.com Subject: Re: [RFC][PATCH] Reset PCIe devices to address DMA problem on kdump with iommu References: <501BB4EF.7080909@jp.fujitsu.com> <20120803114643.GA28330@redhat.com> <501F4877.5050605@jp.fujitsu.com> <20120806203902.GH25559@redhat.com> <50473306.1070803@jp.fujitsu.com> <20120910143604.GB639@redhat.com> <504F1343.7030607@jp.fujitsu.com> <20120914200334.GA9041@phenom.dumpdata.com> In-Reply-To: <20120914200334.GA9041@phenom.dumpdata.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org (2012/09/15 5:03), Konrad Rzeszutek Wilk wrote: >> As to the boot parameter to enable this function, you suggested using >> reset_devices. I found that on a certain platform resetting devices >> caused PCIe error due to a hardware bug. Therefore I think we need >> new parameter apart from reset_devices to disable this function on >> such a machine. > > Wouldn't a DMI quirk be better for this? That way the second kernel > internally would know not to do this. That sounds good. I'll try it, thanks. Thanks, Takao Indoh