Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752458Ab2JCBCj (ORCPT ); Tue, 2 Oct 2012 21:02:39 -0400 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:41111 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751624Ab2JCBCh (ORCPT ); Tue, 2 Oct 2012 21:02:37 -0400 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <506B8D7B.8090004@jp.fujitsu.com> Date: Wed, 03 Oct 2012 09:57:31 +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: andi@firstfloor.org CC: linux-pci@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, martin.wilck@ts.fujitsu.com, kexec@lists.infradead.org, hbabu@us.ibm.com, mingo@redhat.com, vgoyal@redhat.com, ishii.hironobu@jp.fujitsu.com, hpa@zytor.com, bhelgaas@google.com, tglx@linutronix.de Subject: Re: [PATCH v2 0/2] Reset PCIe devices to address DMA problem on kdump with iommu References: <20121002074434.204.47750.sendpatchset@indoh> In-Reply-To: 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 Content-Length: 1111 Lines: 29 (2012/10/03 4:37), Andi Kleen wrote: > Takao Indoh writes: > >> These patches reset PCIe devices at boot time to address DMA problem on >> kdump with iommu. When "reset_devices" is specified, a hot reset is >> triggered on each PCIe root port and downstream port to reset its >> downstream endpoint. > > Great. I've been pondering this for a long time, but you did finally > implement it. I hope this will make kdump a lot more reliable at least > on the systems that support per port reset. Actually I got the idea of this patch from your comment below;-) http://permalink.gmane.org/gmane.linux.network/162414 > > Now the only question is: why make it a option and not default? Except kdump I don't know the situation where this reset is useful, so I introduced it as option so that it works only during kdump. Thanks, Takao Indoh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/