From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1TJDMH-0005Yd-Av for kexec@lists.infradead.org; Wed, 03 Oct 2012 01:02:43 +0000 Received: from m3.gw.fujitsu.co.jp (unknown [10.0.50.73]) by fgwmail5.fujitsu.co.jp (Postfix) with ESMTP id B92E83EE0C3 for ; Wed, 3 Oct 2012 10:02:35 +0900 (JST) Received: from smail (m3 [127.0.0.1]) by outgoing.m3.gw.fujitsu.co.jp (Postfix) with ESMTP id 9C53E45DEB2 for ; Wed, 3 Oct 2012 10:02:35 +0900 (JST) Received: from s3.gw.fujitsu.co.jp (s3.gw.fujitsu.co.jp [10.0.50.93]) by m3.gw.fujitsu.co.jp (Postfix) with ESMTP id 7D9AF45DEB7 for ; Wed, 3 Oct 2012 10:02:35 +0900 (JST) Received: from s3.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id 6DE711DB8038 for ; Wed, 3 Oct 2012 10:02:35 +0900 (JST) Received: from m1000.s.css.fujitsu.com (m1000.s.css.fujitsu.com [10.240.81.136]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id 1A3B61DB803B for ; Wed, 3 Oct 2012 10:02:35 +0900 (JST) Message-ID: <506B8D7B.8090004@jp.fujitsu.com> Date: Wed, 03 Oct 2012 09:57:31 +0900 From: Takao Indoh MIME-Version: 1.0 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: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: andi@firstfloor.org Cc: martin.wilck@ts.fujitsu.com, linux-pci@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, hbabu@us.ibm.com, mingo@redhat.com, ishii.hironobu@jp.fujitsu.com, hpa@zytor.com, bhelgaas@google.com, tglx@linutronix.de, vgoyal@redhat.com (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 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec