From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx1.redhat.com ([209.132.183.28]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TF7UK-0007Fe-T2 for kexec@lists.infradead.org; Fri, 21 Sep 2012 17:58:06 +0000 Message-ID: <505CAAA1.3040409@redhat.com> Date: Fri, 21 Sep 2012 13:57:53 -0400 From: Don Dutile MIME-Version: 1.0 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> 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: Konrad Rzeszutek Wilk Cc: martin.wilck@ts.fujitsu.com, Takao Indoh , linux-pci@vger.kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, hbabu@us.ibm.com, ishii.hironobu@jp.fujitsu.com, bhelgaas@google.com, vgoyal@redhat.com On 09/14/2012 04:03 PM, 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. > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html a DMI quirk for a PCIe switch? pci-quirk maybe? there is a hook in per-device pci reset code path, which could be setup for such a case. _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec