From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:60214 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755329Ab3FCS6y (ORCPT ); Mon, 3 Jun 2013 14:58:54 -0400 Message-ID: <51ACE76B.1000307@redhat.com> Date: Mon, 03 Jun 2013 14:58:51 -0400 From: Don Dutile MIME-Version: 1.0 To: Bryce Lelbach CC: linux-pci@vger.kernel.org Subject: Re: Patch: Increase maximum bus memory window size (for Xeon Phi) References: <20130524165947.GA2487@pyxis.br.cox.net> In-Reply-To: <20130524165947.GA2487@pyxis.br.cox.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-pci-owner@vger.kernel.org List-ID: On 05/24/2013 12:59 PM, Bryce Lelbach wrote: > The attached patch affects pbus_size_mem() in drivers/pci/setup-bus.c. The patch > increases the maximum memory window size for a PCI bus from 2 Gb to 2^63 Gb. > > This change is necessary to support Intel Xeon Phi co-processors. These co-processors > are PCIe devices used for high-performance computing applications. The device requires > an 8Gb memory window to function (the co-processor has 8Gb of onboard memory). > > This patch is a modified version of a patch from Intel's MPSS framework > (specifically, from the "KNC_gold_update_1-2.1.4982-15-rhel-6.3" package), which > will apply to a 3.7.8 kernel (I am about to try it on a 3.8 kernel). To the best > of my knowledge, newer RHEL kernels are shipped with this patch. > This patch is not in (the latest) RHEL6(.4) or the internal staging tree for the next RHEL6(.5) release.