Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753058AbcKYXld (ORCPT ); Fri, 25 Nov 2016 18:41:33 -0500 Received: from mail-yw0-f169.google.com ([209.85.161.169]:36067 "EHLO mail-yw0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751126AbcKYXlX (ORCPT ); Fri, 25 Nov 2016 18:41:23 -0500 MIME-Version: 1.0 In-Reply-To: <20161125193410.GD16504@obsidianresearch.com> References: <7bc38037-b6ab-943f-59db-6280e16901ab@amd.com> <20161123193228.GC12146@obsidianresearch.com> <20161123203332.GA15062@obsidianresearch.com> <20161123215510.GA16311@obsidianresearch.com> <91d28749-bc64-622f-56a1-26c00e6b462a@deltatee.com> <20161124164249.GD20818@obsidianresearch.com> <3f2d2db3-fb75-2422-2a18-a8497fd5d70e@amd.com> <7ff3cf70-b0c3-028e-fea8-c370a1185b65@amd.com> <20161125193410.GD16504@obsidianresearch.com> From: Alex Deucher Date: Fri, 25 Nov 2016 18:41:21 -0500 Message-ID: Subject: Re: Enabling peer to peer device transactions for PCIe devices To: Jason Gunthorpe Cc: Serguei Sagalovitch , =?UTF-8?Q?Christian_K=C3=B6nig?= , Logan Gunthorpe , Dan Williams , "Deucher, Alexander" , "linux-nvdimm@lists.01.org" , "linux-rdma@vger.kernel.org" , "linux-pci@vger.kernel.org" , "Kuehling, Felix" , "Bridgman, John" , "linux-kernel@vger.kernel.org" , "dri-devel@lists.freedesktop.org" , "Sander, Ben" , "Suthikulpanit, Suravee" , "Blinzer, Paul" , "Linux-media@vger.kernel.org" , Haggai Eran Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 500 Lines: 17 On Fri, Nov 25, 2016 at 2:34 PM, Jason Gunthorpe wrote: > On Fri, Nov 25, 2016 at 12:16:30PM -0500, Serguei Sagalovitch wrote: > >> b) Allocation may not have CPU address at all - only GPU one. > > But you don't expect RDMA to work in the case, right? > > GPU people need to stop doing this windowed memory stuff :) > Blame 32 bit systems and GPUs with tons of vram :) I think resizable bars are finally coming in a useful way so this should go away soon. Alex